Configuring Cisco Mainframe Channel Connection Adapters

This chapter describes how to configure the Cisco Mainframe Channel Connection (CMCC) family of adapters. These adapters include the Channel Interface Processor (CIP) for Cisco 7500 and Cisco 7000 series routers, and the ESCON Channel Port Adapter(ECPA) and the Parallel Channel Port Adapter (PCPA) for Cisco 7200 series routers.

Note In this chapter, references to Channel Port Adapter (CPA) correspond to both the ECPA and the PCPA.

For hardware technical descriptions and information about installing the router interfaces, refer to the hardware installation and maintenance publication for your product. For a complete description of the CMCC adapter commands in this chapter, refer to the "Cisco Mainframe Channel Connection Adapter Commands" chapter of the Bridging and IBM Networking Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.

Cisco's Mainframe Channel Connection Adapters

The CMCC adapter family supports the IBM channel attachment and includes the following products:

CIP on the Cisco 7000 and Cisco 7500 series routers
ECPA on the Cisco 7200 series routers
PCPA on the Cisco 7200 series routers

All CMCC adapters support the full range of channel software applications available in the Cisco IOS software.

Figure 171: Cisco Mainframe Channel Connection Adapters

CIP

The CIP for the Cisco 7000 and Cisco 7500 series is designed for high-end network environments that demand high-performance, high-port density, high-capacity solutions.

The CIP provides support for the IBM ESCON Channel Adapter (ECA) and Bus-and-Tag Parallel Channel Adapter (PCA) channel-attached interfaces from Cisco 7000 series routers to IBM mainframes and in most cases, it eliminates the need for a separate front-end processor (FEP).

A single CIP can support up to two physical channel interfaces in any combination of either PCA or ECA. The CIP's Parallel channel interface is provided by the PCA, and the ESCON channel interface is provided by the ECA. Each CIP is pre-configured with the appropriate channel adapters at manufacturing time.

The Cisco 7000 and Cisco 7500 series routers support online insertion and removal (OIR), which allows you to install or remove CIPs while the system is operating.

Benefits

The key benefits of the CIP are as follows:

Maximum throughput for every application---For the individual applications supported on the CIP, the CIP offers maximum throughput. For example, the number of users supported for TCP/IP offload is 10,000 and the number of LLC2 session supported is 8000.
Scalability---The CIP supports up to 22 channel connections on a Cisco 7000 and Cisco 7500 series router platforms.
Multiple interface support---The CIP supports multiple ESCON and Bus-and-Tag channel interfaces.
Higher memory capacity---The CIP offers a high memory capacity of 128 MB that can be useful for software applications utilizing a high number of sessions. An example of such an application is the TN3270 server.
Port density---The CIP contains two channel interfaces, as compared to the CPA which offers one channel interface.

CPA

The CPA is available for the Cisco 7200 series routers. The CPA expands the value of Cisco's IBM channel solution by providing channel connectivity to mid-range mainframe configurations. The CPA is a standard single-width port adapter supporting ESCON or Parallel channel interfaces to IBM mainframes.

The only differences between CMCC software applications running on the CIP and a CPA are performance and capacity. The performance difference is based upon differences in the internal bus architecture of a CIP vs a CPA, and the capacity difference is based on the difference in maximum memory configurations (128 MB for CIP and 32 MB for CPA).

Each CPA provides a single channel interface for Cisco 7200-series routers. In some situations, this eliminates the need for a separate front-end processor (FEP). The CPA contains a single I/O connector.

The Cisco 7200-series router supports online insertion and removal (OIR), which allows you to install or remove port adapters while the system is operating.

Benefits

The key benefits of CPA are as follows:

Cost-effective---Both a CPA and Cisco 7200-series router provide industry-leading price performance.
Simplified migration path---The CPA and CIP microcode support the same features and applications, enabling seamless migration for network expansion.
Flexibility---The Cisco 7200 series router platform provides a great number of features and capabilities that can be used in conjunction with a CPA.

ECPA

An ECPA is classified as a high-speed port adapter providing a single ESCON physical channel interface. Current Cisco 7200 configuration guidelines recommend using no more than three high-speed port adapters in a single Cisco 7200 router. Refer to the Cisco 7200 Series Port Adapter Hardware Configuration Guidelines publication for more details.

PCPA

A PCPA provides a single Parallel channel physical interface supporting both 3.0 and 4.5 MBps data transfer rates.

Differences between the CIP and CPA

Table 9 illustrates the differences between the CMCC adapters.

Table 9: Differences between the CIP and the CPA
Product Differences CIP ECPA PCPA

Router platform

Cisco 7500
Cisco 7000 with RSP7000

Cisco 7200

Cisco 7200

Channel interfaces

ESCON
Parallel

ESCON

Parallel

Maximum number of interfaces

2

1

1

Maximum memory

128 MB

32 MB

32 MB

Cisco IOS release support

Cisco IOS release 10.2 and later

Cisco IOS release 11.3(3)T and later

Cisco IOS release 11.3(3)T and later

Virtual port adapter

2

0

0

Channel interface state tracking (HSRP, SNMP alerts)

Yes

Disabled---Use the state-tracks-signal command to enable

Disabled---Use the state-tracks-signal command to enable

Table 9: **Differences between the CIP and the CPA**
Product Differences	CIP	ECPA	PCPA
Router platform	Cisco 7500 Cisco 7000 with RSP7000	Cisco 7200	Cisco 7200
Channel interfaces	ESCON Parallel	ESCON	Parallel
Maximum number of interfaces	2	1	1
Maximum memory	128 MB	32 MB	32 MB
Cisco IOS release support	Cisco IOS release 10.2 and later	Cisco IOS release 11.3(3)T and later	Cisco IOS release 11.3(3)T and later
Virtual port adapter	2	0	0
Channel interface state tracking (HSRP, SNMP alerts)	Yes	Disabled---Use the state-tracks-signal command to enable	Disabled---Use the state-tracks-signal command to enable

Supported Environments

The CMCC adapters provide support for the environments discussed in the following sections:

TCP/IP Environments Using CLAW

TCP/IP mainframe protocol environments for IBM operating systems Multiple Virtual Storage (MVS) and Virtual Machine (VM) are supported. This support includes TCP/IP-based applications such as terminal emulation (Telnet), the File Transfer Protocol (FTP), Simple Mail Transfer Protocol (SMTP); and Network File System (NFS), a distributed file access system. In addition, Internet Control Message Protocol (ICMP) and User Datagram Protocol (UDP) are supported.

The Cisco IOS implements the Common Link Access to Workstation (CLAW) channel protocol to transport data between the mainframe and a CMCC adapter in TCP/IP environments. Each CLAW connection requires two devices out of a maximum of 256. Although this allows for a maximum of 128 CLAW connections per interface, a maximum of 32 CLAW connections per interface is recommended.

The CLAW packing feature enables the transport of multiple IP packets in a single channel operation and significantly increases throughput performance between a mainframe and a CMCC adapter. Currently, IBM's TCP/IP stack does not support the CLAW packing feature.

The CLAW packing feature requires changes to the mainframe CLAW driver support. In partnership with Cisco Systems, Interlink Computer Science has made the corresponding CLAW driver change to Cisco IOS for S/390 Release 2 and Interlink TCPaccess 5.2. Customers must make the necessary changes to their host configurations in order to enable the CLAW packing feature.

TCP/IP Offload Environments

TCP/IP mainframe protocol environments for IBM operating systems MVS, VM, and Transaction Processing Facility (TPF) are supported.

The TCP/IP offload feature for CMCC adapters delivers the same function as the TCP/IP offload function on the 3172 Interconnect Controller (Model 3), but with increased performance.

IP Host Backup Environment

You can connect multiple mainframes to a single CMCC adapter using a ESCON. Often, these mainframes run using the ESCON Multiple Image Facility (EMIF), which permits the physical machine to be divided into multiple logical partitions (LPARs). By defining an unused partition on another mainframe, a user can move the operating system from a failed mainframe or mainframe partition to the unused partition. By having multiple paths to each device, the move is accomplished without changing the mainframe software. This function also permits moving an IP stack between multiple operating system images.

On the CMCC adapter, each IP connection is treated as a physical device. The CMCC adapter does not support multiple active paths to a single IP connection (or device). Prior to IP Host Backup, the router configuration had to be changed whenever the mainframe operating system was moved from one mainframe or LPAR to another. The IP Host Backup feature permits the mainframe operating system to be moved from one mainframe to another without requiring a change to the router configuration at the time of the move.

Note IP Host Backup does not provide single system image or automatic failover to a waiting backup application. Host operator action on the mainframe is required in these instances.

TN3270 Server Environments

The TN3270 server feature on a CMCC adapter card provides mapping between an SNA 3270 host and a TN3270 client connected to a TCP/IP network as shown in Figure 172. Functionally, it is useful to view the TN3270 server from two different perspectives: SNA functions and Telnet Server functions.

SNA Functions

: From the perspective of an SNA 3270 host connected to the CMCC adapter, the TN3270 server is an SNA device that supports multiple PUs, with each PU supporting up to 255 logical units (LUs). The LU can be Type 1, 2, or 3. The SNA host is unaware of the existence of the TCP/IP extension on the implementation of these LUs.
: The LUs implemented by TN3270 server are dependent LUs. To route these dependent LU sessions to multiple VTAM hosts connected to the TN3270 server in the CMCC adapter card, rather than routing in the VTAM hosts, the TN3270 server implements a SNA session switch with end node dependent LU requester (DLUR) function. Using the DLUR is optional so that the TN3270 server can be used with VTAM versions prior to version 4.2, which provide no Advanced Peer-to-Peer Networking (APPN) support.
: SNA session switch allows you to eliminate SNA subarea routing between hosts of TN3270 traffic by establishing APPN links with the primary LU hosts directly.

Telnet Server Functions

: From the perspective of a TN3270 client, the TN3270 server is a high-performance Telnet server that supports Telnet connections, negotiation and data format. The server on the CMCC adapter card supports Telnet connection negotiation and data format as specified in RFC 1576 (referred to as "traditional TN3270") and RFC 1647 (referred to as "TN3270E").

Figure 172: TN3270 Implementation

Unless the TN3270 server uses a Token Ring connection to a Front-End Processor (FEP) as its host connection, it will require CSNA or CMPC support. For this reason, TN3270 configuration issues and tasks begins in the section "Configure TN3270 on a CMCC Adapter," later in this chapter.

Note To enable the TN3270 server feature, you must have a CMCC adapter installed in a Cisco 7000 with RSP7000, Cisco 7500 series router, or a Cisco 7200 router. The TN3270 server is very different from the TN3270 terminal emulation access feature described in the "Configuring Dial-In Terminal Services" chapter of the Dial Solutions Configuration Guide.

Cisco SNA Environments

The CSNA feature provides support for SNA protocols over both ESCON and Parallel interfaces to the IBM mainframe. As an IBM 3172 replacement, a CMCC adapter supports the External Communications Adapter (XCA) feature of Virtual Telecommunications Access Method (VTAM), which allows VTAM to define Token Ring devices attached to the 3172 as switched devices.

In SNA environments, support for the XCA feature of VTAM allows the CMCC adapter to provide an alternative to FEPs at sites where NCP is not required for SNA routing functions.

By providing CLS and the Logical Link Control type 2 (LLC2) protocol stack on the CMCC adapter card, all frames destined to the CMCC adapter or from the CMCC adapter card are switched by the router. The presentation of LAN media types allows the CSNA feature to take advantage of current source-route bridging (SRB), remote source-route bridging (RSRB), data-link switching plus (DLSw+), Source-Route Translational Bridging (SR/TLB), internal SDLC-LLC2 translational bridging (SDLLC), Qualified Logical Link Control (QLLC) services and APPN.

The CSNA feature supports the following communication through a Cisco 7000 with RSP7000, Cisco 7500, and Cisco 7200 series router:

Communication between a channel-attached mainframe running VTAM and a LAN/WAN attached Physical Unit (PU) 2.0 SNA node
Communication between a channel-attached mainframe running VTAM and a LAN/WAN attached PU 2.1 SNA node
Communication between a channel-attached mainframe running VTAM and a LAN/WAN attached PU 5/4 SNA node
Communication between two mainframes running VTAM channel-attached to the same CMCC adapter card or different CMCC adapter cards in a Cisco 7000 with RSP7000, Cisco 7500 series router, or a Cisco 7200 router

The CSNA feature provides SNA connectivity through Media Access Control (MAC) addresses configured for internal MAC adapters on the Cisco 7000 with RSP7000, Cisco 7500 series router and the Cisco 7200 series router. These internal MAC adapters correspond to XCA major node definitions in VTAM, providing access points (LAN gateway) to VTAM for SNA network nodes. The internal MAC adapters are configured to exist on internal LANs located on a CMCC adapter card. Each CMCC adapter card can be configured with multiple internal Token Ring LANs. Each internal Token Ring LAN must be configured to participate in source-route bridging. There is a maximum limit of 18 internal MAC adapters per CMCC adapter. The internal MAC adapter is an emulation of LAN adapters in an IBM 3172 Interconnect Controller.

Cisco MultiPath Channel Environments

The CMPC feature provides support for APPN connections using both High Performance Routing (HPR) and Intermediate Session Routing (ISR). It supports the VTAM Transport Resource List (TRL) major node and the VTAM Local SNA major node.

The CMPC feature can be used to establish an APPN connection between VTAM and the following APPN nodes:

Another VTAM channel attached to the same CMCC adapter
Another VTAM channel attached to a different CMCC adapter in the same router
TN3270 server DLUR in the same CMCC adapter
An APPN network node (NN) in the router with the CMCC adapter
Other APPN nodes external to the CMCC adapter and router with the CMCC adapter: CS/2, AS/400, other LAN or WAN attached VTAM nodes

The CMPC feature isolates VTAM from the actual network topology. The MPC protocol is terminated on the CMCC adapter and converted to LLC protocols. Once converted to LLC protocols other Cisco features are used to connect VTAM to other APPN nodes in the network. CMPC can be used with DLSw+, RSRB, SR/TLB, SRB, SDLLC, QLLC, ATM LAN emulation, and FRAS host to provide connectivity to VTAM.

CMCC Adapter Interface Configuration Task List

You can perform the tasks in the following sections to configure and maintain IBM channel attach interfaces.

Some CMCC adapter software features are configured on a virtual port. On the CIP adapter cards installed in a Cisco 7000 with RSP 7000 or a Cisco 7500 series router, there are up to two physical ports, numbered 0 and 1, and a virtual port, numbered 2. However, on the CPA installed in a Cisco 7200 series router, the single physical port and the virtual port are configured using the same port number ID, number 0.

Not all tasks are required. Your CMCC adapter image may be preloaded. You must select an interface, after which you configure the features you want supported on that interface.

Note You can configure a CMCC adapter interface for any or all of the supported environments. If you want only CSNA support, for example, you need not configure TCP/IP support.

See the end of this chapter for "CMCC Interface Configuration Examples."

Because the TN3270 server configuration is performed after an interface is configured for CSNA support, TN3270 configuration issues and tasks are addressed separately from the interface configuration tasks. The TN3270 configuration task list begins in the section "TN3270 Configuration Task List," later in this chapter.

Load the CMCC Adapter Microcode Image

This section provides information on loading the microcode images for the CIP and CPA.

CIP Microcode Image

Beginning with Cisco IOS Software Release 11.1, the CIP microcode (or CIP image) no longer is bundled with the Cisco IOS software. You must have Flash memory installed on the Route Switch Processor (RSP) card to use the IBM channel attach features in Cisco IOS Software Release 11.1 and later.

The CIP image is preloaded on Flash cards for all Cisco 7000 with RSP7000 and Cisco 7500 series routers ordered with the CIP option for Cisco IOS Software Release 11.1 and later. Use the commands in this section if you are upgrading the CIP image in your router.

To prepare the CIP, use the following commands beginning in privileged EXEC command mode:

Step Command Purpose

1 .

enable

Enter the privileged EXEC mode command interpreter.

2 .

copy tftp flash
copy tftp slot0: (Flash card)
copy tftp slot1: (Flash card on 7500 series router)
copy tftp bootflash: (onboard Flash on 7500 series router)

Copy the CIP image from a server to the Flash memory. Use the appropriate command for your system. You must be running Cisco IOS Release 11.1 or later prior to executing a copy tftp command.

3 .

configure terminal

In privileged command mode, enter router configuration mode and specify that the console terminal will be the source of the configuration subcommands.

4 .

microcode cip flash bootflash:cipxxx-yy
or
microcode cip flash slot n:cipxx-yy

Configure your router to load the Flash image to
the CIP:

Enter global configuration mode and specify that the CIP microcode load from a Flash card in router slot n or from embedded Flash.

Load the image from Flash to the CIP card.

5 .

microcode reload

Force a microcode reload in router configuration mode.

6 .

end

Exit configuration mode.

7 .

copy running-config startup-config

Save the running configuration as the new startup configuration in NVRAM.

8 .

show controllers cbus

Exit configuration mode and display images loaded on the CIP card.

9 .

show running-config

Verify the contents of the configuration file.

10 .

show microcode

Show the microcode images for downloadable hardware.

CPA Microcode Image

The CPA microcode image is preloaded on Flash memory cards for Cisco 7200 series routers for Cisco IOS Release 11.3(3)T and later. You may be required to copy a new image to Flash memory when a new microcode image becomes available. Use the commands in this section if you are upgrading or loading a microcode image other than the default.

To prepare the CPA, use the following commands beginning in privileged EXEC command mode:

Step Command Purpose

1 .

enable

Enter the privileged EXEC mode command interpreter:

2 .

copy tftp:filename [bootflash | slot0: | slot1:]filename

Copy the CPA microcode image from a server to either of the Flash memory cards. The source of the file is tftp:filename.

3 .

configure terminal

In privileged command mode, enter router configuration mode and specify that the console terminal will be the source of the configuration subcommands.

4 .

microcode {ecpa | pcpa} filename

To load the microcode from an individual microcode image that is stored as a file on a Flash memory card, enter the microcode command, the processor type, the specific memory location of the CPA microcode image, and the exact argument for filename.

5 .

microcode reload

or

microcode reload {all | {{ ecpa | pcpa} slot number}}

Load the specified CPA image from router configuration mode

or

Force a microcode reload in privileged EXEC mode, without entering global configuration mode.

6 .

end

Exit configuration mode.

7 .

copy running-config startup-config

Save the running configuration as the new startup configuration in NVRAM.

8 .

show controllers channel slot/port

Verify that the correct microcode is loaded according to the new instructions. The display indicates the currently loaded and running microcode version for each CPA display software and hardware information for the CPAs in your router.

9 .

show running-config

Verify the contents of the configuration file.

10 .

show microcode

Show the microcode images for downloadable hardware.

Select the Interface

Before you configure your channel attach interface, you must select the interface. Use the following command in global configuration mode:

Command Purpose

interface channel slot/port

Select the channel attach interface and enter interface configuration mode.

Command	Purpose
interface channel slot/port	Select the channel attach interface and enter interface configuration mode.

Use the show extended channel EXEC commands to display current CMCC adapter status. This command provides a report for each interface configured to support IBM channel attach.

Configure Channel Interface Tracking for HSRP or SNMP Alerts

If you want to use Hot Standy Router Protocol (HSRP) or SNMP alerts to monitor channel interface status for an ECPA or PCPA channel interface, use the following command in interface configuration mode to enable physical interface signal tracking:

Command Purpose

state-tracks-signal

Enables tracking of the physical interface signal for an ECPA or PCPA channel interface.

Command	Purpose
state-tracks-signal	Enables tracking of the physical interface signal for an ECPA or PCPA channel interface.

The state-tracks-signal command is valid only on channel interfaces which combine the functions of both a physical and virtual interface. The ECPA and PCPA are examples of this type of channel interface. The command is not valid for the CIP, which has a separate channel interface for the virtual channel functions.

Configure TCP/IP CLAW or CLAW Packing Support

The following sections describe how to configure CLAW support. This feature is configured on the physical interface. All tasks, except for configuring other interface support are required.

See the section "Select Host System Parameters" for guidelines on matching interface configuration values with host system values.

Assign an IP Address

You must assign an IP address to the channel interface so that it can communicate with other devices (or tasks) on the network. The IP address you assign to the interface must be in the same subnetwork as the hosts with which you wish to communicate.

To assign an IP address, use the following command in interface configuration mode:

Command Purpose

ip address address mask

Assign an IP address and network mask to the selected interface.

Command	Purpose
ip address address mask	Assign an IP address and network mask to the selected interface.

Configure the IBM Channel Attach Interface

You must define the devices, or tasks, supported on the interface. Some information you need to perform this task is derived from the following host system configuration files: MVSIOCP, IOCP, and the TCPIP configuration. Refer to the section "Select Host System Parameters" for guidelines on matching interface configuration values with host system values.

To configure an IBM channel interface, use the following command in interface configuration mode:

Command Purpose

claw path device-address ip-address host-name device-name host-app device-app [broadcast] [backup]

Define the CLAW parameters for this device.

Command	Purpose
claw path device-address ip-address host-name device-name host-app device-app [broadcast] [backup]	Define the CLAW parameters for this device.

The CLAW Packing feature requires changes to the mainframe CLAW driver support. In partnership with Cisco Systems, Interlink Computer Science has made the corresponding CLAW driver change to Cisco IOS software for S/390 Release 2 and Interlink TCPaccess 5.2. Configuration parameters in the host TCP/IP applications must change to enable the CLAW packing feature.

See the section "CMCC Interface Configuration Examples" for samples of claw commands for different configurations.

Select a Data Rate for the Parallel Channel Interfaces

When you configure a Parallel channel attach interface, you must define a data rate of either 3 MBPS or 4.5 MBPS.

To select a data rate, use the following command in interface configuration mode:

Command Purpose

channel-protocol [s | s4]

Define the Parallel data transfer rate.

Command	Purpose
channel-protocol [s \| s4]	Define the Parallel data transfer rate.

Configure Other Interface Support

To enhance the usefulness of IBM channel attach support, you can further define how the interface and the router interoperate by using the following commands in interface configuration mode:

Step Command Purpose

1 .

ip route-cache same-interface

Include fast switching support for multiple IP datagram applications running on the same CMCC adapter, as required.

2 .

no ip redirects

Always include this command when configuring host-to-host communications through the same interface.

Configure TCP/IP Offload Support

The following sections describe how to configure the IBM channel attach interface for TCP/IP offload support. All tasks, except for configuring other interface support, are required:

See the section "Select Host System Parameters" for guidelines on matching interface configuration values with host system values.

Assign an IP Address

Command	Purpose
ip address address mask	Assign an IP address and network mask to the selected interface.

Configure the IBM Channel Attach Interface

You must define the devices, or tasks supported on the interface. Some information you need to perform this task is derived from the following host system configuration files: MVSIOCP, IOCP, and the TCP/IP configuration. Refer to the section "Select Host System Parameters" for guidelines on matching interface configuration values with host system values.

To configure the IBM channel interface, use the following command in interface configuration mode:

Command Purpose

offload path device-address ip-address host-name device-name host-app device-app host-link device-link [broadcast] [backup]

Define the offload parameters for this device.

Command	Purpose
offload path device-address ip-address host-name device-name host-app device-app host-link device-link [broadcast] [backup]	Define the offload parameters for this device.

See the section "CMCC Interface Configuration Examples" for samples of offload commands for different configurations.

Select a Data Rate for the Parallel Channel Interfaces

When you configure a Parallel channel attach interface, you must define a data rate of either 3 MB per second or 4.5 MB per second.

To select a data rate, use the following command in interface configuration mode:

Command Purpose

channel-protocol [s | s4]

Define the Parallel data transfer rate.

Command	Purpose
channel-protocol [s \| s4]	Define the Parallel data transfer rate.

Configure Other Interface Support

You can further define how the interface and the router interoperate. You can use the following commands in interface configuration mode to enhance the usefulness of IBM channel attach support:

Step Command Purpose

1 .

ip route-cache same-interface

Include autonomous switching support for multiple IP datagram applications running on the same CMCC adapter, as required.

2 .

no ip redirects

Always include this command when configuring host-to-host communications through the same ESCON interface.

Configure CSNA Support

The following sections describe how to configure the IBM channel attach interface for CSNA support. This procedures requires the configuration of both the physical and virtual interfaces. The last task, "Configure an Internal Adapter's Link Characteristics," is optional. All other tasks are required.

Select a Data Rate for the Parallel Channel Interfaces

When you configure a Parallel channel attach interface, you must define a data rate of either 3 MBps or 4.5 MBps.

To configure the data rate, use the following command in interface configuration mode:

Command Purpose

channel-protocol [s | s4]

Define the Parallel data transfer rate.

Configure Internal Adapters

To select or configure an internal adapter, use the following command in internal LAN configuration mode:

Command Purpose

adapter adapno mac-address

Select the internal adapter to configure.

Name the Internal Adapter

Select a name for the internal adapter. Use the following command in internal adapter configuration mode:

Command Purpose

name name

Select a name for the internal adapter.

Configure an Internal Adapter's Link Characteristics

To configure the LLC link characteristics of an internal adapter, use the following optional commands in internal adapter configuration mode:

Command Purpose

llc2 N1 bytes

Maximum size of an I-frame in bytes.

llc2 N2 retry-count

Maximum retry count.

llc2 Nw window-size-increase

Increase the window size for consecutive good I-frame received (zero is disabled).

llc2 ack-delay-time milliseconds

Maximum time for incoming I-frames to stay unacknowledged.

llc2 ack-max frame-count

Maximum number of I-frames received before an acknowledgment must be sent.

llc2 idle-time milliseconds

Frequency of polls during periods of idle traffic.

llc2 local-window frame-count

Maximum number of I-frames to send before waiting for an acknowledgment.

llc2 recv-window frame-count

Receive window.

llc2 t1-time milliseconds

Specify amount of time to wait for an acknowledgment to transmit I-frames.

llc2 busy-time milliseconds

Amount of time to wait while the other LLC2 station is in a busy state before attempting to poll the remote station.

llc2 tpf-time milliseconds

Amount of time to wait for a final response to a poll frame before resending the original poll frame.

llc2 trej-time milliseconds

Amount of time to wait for resending a rejected frame before sending the reject command.

Configure the CMCC Adapters for IP Host Backup

The following sections describe how to configure the IBM channel attach interface for IP Host Backup support. With IP Host Backup, you can configure a backup group for each CLAW or offload device, one path at a time, or you can specify a group of IP host paths and then configure which CLAW or offload IP addresses are used with those paths. Using the second method, specifying paths, provides a shortcut to the one at a time method.

Configure a CLAW IP Host Backup Group

To configure the CLAW IP Host Backup, use the following command in interface configuration mode:

Command Purpose

claw path device-address ip-address host-name device-name host-app device-app [broadcast] backup

Define the CLAW parameters for this device.

See the section "Configuration Tasks" for samples of claw commands for different configurations.

Configure an Offload IP Host Backup Group

To configure the Offload IP Host backup, use the following command in interface configuration mode to configure an Offload device (read and write subchannel) for communication with a mainframe TCP/IP stack in Offload mode:

Command Purpose

offload path device-address ip-address host-name device-name host-ip-link device-ip-link host-api-link device-api-link [broadcast] backup

Define the offload parameters for this device.

See the section "Configuration Tasks" for samples of offload commands for different configurations.

Configure an IP Host Backup Group Using Paths

You can define a backup group by specifying a path, or group of paths, that are used as the IP Host Backup. Under the backup group, you can have multiple backup connections defined that all use the same IP address.

To configure the IP Host Backup using paths, use the following commands beginning in interface configuration mode:

1 .
Command Purpose

2 .

path path [[path ...]]

Define the backup path, or paths, for this group and enter IP Host Backup configuration mode.

3 .

claw device-address ip-address host-name device-name host-app device-app [broadcast]

Define the CLAW parameters for this device.

4 .

offload path device-address ip-address host-name device-name host-ip-link device-ip-link host-api-link device-api-link [broadcast]

Alternatively, you can define the offload parameters for this device

5 .

exit

Exit IP Host Backup configuration mode and return to interface configuration mode.

Select Host System Parameters

This section describes how to correlate values found in the VM and MVS system I/O configuration program (IOCP) files with the fields in the claw, csna, cmpc, and offload interface configuration commands. In addition, for CLAW and Offload, you will need configuration information from the host TCP/IP application configuration file. Refer to the following IBM operating system manuals for specific IOCP configuration statement details:

Transmission Control Protocol/Internet Protocol TCP/IP Version 2 Release 2.1 for MVS: Planning and Customization, SC31-6085 (or later version)
Transmission Control Protocol/Internet Protocol TCP/IP Version 2 Release 2 for VM: Planning and Customization, SC31-6082 (or later version)

Values from the Host IOCP File

When you define CLAW or offload parameters, you must supply path information and device address information to support routing on an IBM channel. The path information can be simple, in the case of a channel directly attached to a router, or more challenging when the path includes an ESCON director switch or multiple image facility support.

The path argument is a concatenation of three hexadecimal numbers that represent the values listed in Table 10.

Table 10: CLAW Path Argument Values
CLAW Path Argument Breakdown Values Description

Path

01-FF

For a directly attached ESCON channel or any Parallel channel, this value is 01 unless the system administrator has configured another value.

For a channel attached through an ESCON director switch, this value will be the path that, from the Cisco IOS software point of view, exits the switch and attaches to the host.

Channel logical address

0-F

For a Parallel channel, this value is 0. For a directly attached ESCON channel, the value may be non-zero.

If the host is running in Logical Partition (LPAR) mode and the CHPID is defined as shared, this is the partition number associated with the devices configured in the IOCP.

The default for this part of the path argument is 0.

Otherwise, the channel logical address associated with the channel is defined in the IOCP.

Control unit logical address

0-F

For a Parallel channel, this value is 0. For a directly attached ESCON channel, the value may be non-zero.

If this value is specified in the IOCP, match that value here.

Otherwise, the control unit logical address is specified in the IOCP CNTLUNIT statement for the host channel in the CUADD parameter.

In Figure 173, two host systems connect to the ESCON director switch on paths 23 and 29. The channels both exit the switch on path 1B and attach to Router A.

Figure 173: System with an ESCON Director Switch and a Directly Attached Channel

Note that the path between Host A and Host B is dynamically switched within the ESCON director. A third host is attached directly to Router B through path 42.

The IOCP control unit statements would look similar to the following examples:

Host A

CNTLUNIT CUNUMBER=0001, PATH=(23), LINK=1B, UNITADD=((00,64)), UNIT=SCTC, CUADD=F

Host B

CNTLUNIT CUNUMBER=0002, PATH=(29), LINK=1B, UNITADD=((00,64)), UNIT=SCTC, CUADD=A

Host C

CNTLUNIT CUNUMBER=000A, PATH=(42), UNIT=SCTC, UNITADD=((00,64))

The system administrator can provide you with the values. For example the ESCON director ports 15 and 19 in Figure 173 are the channel attachments from the ESCON director to each host. Given these values, the claw command path argument for the two channel attachments to Router A becomes:

claw 150F
claw 190A

The offload command path argument for the two channel attachments to Router A becomes:

offload 150F
offload 190A

The claw command path argument for the directly attached channel to Router B is easy to determine:

claw 0100

Similarly, the offload command path argument for the directly attached channel to Router B is as follows:

offload 0100

Next, determine the claw, csna, cmpc, or offload command device-address argument value, which is shown as 00 in the UNITADD parameter for all three devices. Based on the above example, this value can be any even value.

The UNITADD parameter in the CNTLUNIT macro of the IOCP file defines the valid range for device addresses. In the example above, a UNITADD parameter of (00,64) means that the first valid device address is 00 and the number of devices is 64 for a range of 00 to 63. In the hexadecimal notation used by channel configuration commands this translates to a range of 00 to 3F.

The claw (or offload) commands now become:

Router A (for the claw command)

claw 150F 00
claw 190A 00

Router A (for the offload command)

offload 150F 00
offload 190A 00

Router B (for the claw command)

claw 0100 02

Router B (for the offload command)

offload 0100 02

Values from the Host TCP/IP File

The remainder of the claw and offload command arguments are derived from the DEVICE, LINK, and HOME statements in the host TCP/IP configuration files. The csna and cmpc configuration commands include only path and device. The statements will be similar to the following:

Host A

DEVICE EVAL CLAW 500 VMSYSTEM C7000 NONE  20  20 4096 4096
LINK EVAL1 IP 0 EVAL
HOME 198.92.2.12   EVAL1

Host B

DEVICE EVAL CLAW 600 STSYSTEM C7000 NONE  20  20 4096 4096
LINK EVAL1 IP 0 EVAL
HOME 198.92.2.13   EVAL1

Host C

DEVICE EVAL CLAW 700 RDUSYSTM C7000 NONE  20  20 4096 4096
LINK EVAL1 IP 0 EVAL
HOME 198.92.2.14   EVAL1

The DEVICE statement lists the host-name and device-name values to use, which follows the CLAW 500 entry in the DEVICE statement.

The LINK statement links the device name, EVAL, to EVAL1. The IP address for EVAL1 appears in the HOME statement.

Based on this example, you can supply the remainder of the arguments for the sample claw commands:

Router A

claw 150F 00 198.92.2.12 VMSYSTEM C7000 TCPIP TCPIP
claw 190A 00 198.92.2.13 STSYSTEM C7000 TCPIP TCPIP

Router B

claw 0100 02 198.92.2.14 RDUSYSTM C7000 TCPIP TCPIP

Similarly, the sample offload commands are as follows:

Router A

offload 150F 00 198.92.2.12 VMSYSTEM C7000 TCPIP TCPIP TCPIP API
offload 190A 00 198.92.2.13 STSYSTEM C7000 TCPIP TCPIP TCPIP API

Router B

offload 0100 02 198.92.2.14 RDUSYSTM C7000 TCPIP TCPIP TCPIP API

Example of a Derived Value

When you have a directly attached channel, the system administrator may provide you with a system IODEVICE ADDRESS that you can use. In this case, you must work backwards through the IOCP file to locate the proper device-address argument value for the claw command.

In this first example, the IODEVICE ADDRESS value is 800. Using this number, you locate the IODEVICE ADDRESS statement in the IOCP file, which points you to the CNTLUNIT statement that contains the device-address argument value for the claw, csna, cmpc or offload command:

IODEVICE ADDRESS=(0800,256),CUNUMBR=(0012),UNIT=SCTC
**** Address 800 points to CUNUMBR 0012 in the following statement
 
CNTLUNIT CUNUMBR=0012,PATH=(28),UNIT=SCTC,UNITADD=((00,256))
**** The device-address is the UNITADD value of 00

From this example, the claw command would be similar to the following:

claw 0100 00 197.91.2.12 CISCOVM EVAL TCPIP TCPIP

In the next example, the system administrator has given you an IODEVICE ADDRESS of 350, which does not correspond exactly to a value in the IOCP file. In this instance you must calculate an offset device-address argument value for the claw or offload command:

IODEVICE ADDRESS=(0340,64),CUNUMBR=(0008),UNIT=SCTC 
IODEVICE ADDRESS=(0380,64),CUNUMBR=(0009),UNIT=SCTC 
**** Address 350 (340 + 10) is in the range covered by CUNUMBER 0008
 
CNTLUNIT CUNUMBR=0008,PATH=(24),UNIT=SCTC,UNITADD=((40,64)),SHARED=N, X 
**** The device-address is the UNITADD value of 40, offset by 10
**** The device-address to use is 50

From this example, the claw command would be similar to the following:

claw 0100 50 197.91.2.12 CISCOVM EVAL TCPIP TCPIP

Note In the IOCP examples for the IODEVICE and CNTLUNIT statements, UNIT=SCTC is the usual value for ESCON channels. Parallel channels will have UNIT=3088 in the CNTLUNIT statement and UNIT=CTC in the IODEVICE statement.

Caution
When you are running MVS, you must disable the missing interrupt handler (MIH) to avoid introducing errors into the CLAW algorithm. Refer to the IBM publication Transmission Control Protocol/Internet Protocol TCP/IP Version 2 Release 2.1 for MVS: Planning and Customization (publication SC31-6085 or later) for information on disabling the MIH.

Monitor and Maintain the Interface

You can perform the tasks in the following sections to monitor and maintain the interfaces:

Monitor Interface Status

The software allows you to display information about the interface, including the version of the software and the hardware, the controller status, and statistics about the interfaces. The following table lists some of the interface monitoring commands. To display the full list of show commands, enter show ? at the EXEC prompt.

Perform the following commands in EXEC mode to display information associated with each command. All commands are applicable to all CMCC adapter interfaces (CIP and CPA), unless it is mentioned that they are specific to a particular CMCC adapter. Commands are listed in alphabetic order.

Command Purpose

show controllers cbus

Display the cbus internal state for the Cisco 7000 with RSP7000 and Cisco 7500 series routers. Also included in the display is CIP-specific information such as the currently loaded microcode, currently loaded microcode application segments, and load metrics.

show controllers channel [slot/port]

Display CPA-specific information, including the currently loaded microcode.

show extended channel slot/port backup [ip-address]

Display information about CLAW and offload commands for each backup group.

show extended channel slot/port cmpc [path [device]]

Display information about each CMPC subchannel configured on the specified CMCC adapter interface.

show extended channel slot/port connection-map llc2

Display the number of active LLC2 connections for each SAP and the mapping of the internal MAC adapter and the SAP to the resource that activated the SAP.

show extended channel slot/port csna [admin | oper | stats] [path [device]]

Display information about the CSNA subchannels configured on the specified CMCC adapter interface.

show extended channel slot/port llc2 [admin | oper | stats] [lmac [lsap [rmac [rsap]]]]

Display information about the LLC2 sessions running on the CMCC adapter interfaces.

show extended channel slot/port max-llc2-sessions

Display information about the number of LLC2 sessions supported on the CMCC adapter.

show extended channel slot/port icmp-stack [ip-address]

Display information about the ICMP stack running on the CMCC adapter interfaces.

show extended channel slot/port ip-stack [ip-address]

Display information about the IP stack running on the CMCC adapter interfaces

show extended channel slot/port llc2 [admin | oper | stats] [lmac [lsap [rmac [rsap]]]]

Display information about the LCC2 sessions running on the CMCC adapter interfaces.

show extended channel slot/port packing names [path [device]]

Display CLAW packing names and their connection state.

show extended channel slot/port packing stats [path[device]]

Display CLAW packing statistics.

show extended channel slot/port statistics [path [device]] [connected]

Display information about CMCC adapter interfaces for diagnostic purposes.

show extended channel slot/port subchannel [connected]

Display information about the CMCC adapter interfaces

show extended channel slot/port tcp-connections [[loc-ip-addr [loc-port [rem-ip-addr [rem-port]] [detail | summary]

Display information about the TCP sockets on a channel interface.

show extended channel slot/port tcp-stack [ip-address]

Display information about the TCP stack running on the CMCC adapter interfaces.

show extended channel slot/port tg [oper | stats] [detailed] [tg-name]

Display configuration, operational, and statistics information for CMPC transmission groups configured on a specified CMCC adapter internal LAN interface.

show extended channel slot/port tn3270-server

Display current configuration parameters and the status of the PUs defined in each TN3270 server.

show extended channel slot/port tn3270-server client-ip-address ip-address [disconnected | in-session | pending]

Display information about all clients at a specific IP address.

show extended channel slot/port tn3270-server dlur

Display information about the SNA session switch.

show extended channel slot/port tn3270-server dlurlink name

Display information about the DLUIR components.

show extended channel slot/port tn3270-server nailed-ip ip-address

Display mappings between a nailed client IP address and nailed LUs.

show extended channel slot/port tn3270-server pu pu-name

Display the PU configuration parameters, statistics, and all the LUs currently attached to the PU.

show extended channel slot/port tn3270-server pu pu-name lu locaddr [history]

Display information about the TN3270 server LUs running on CMCC adapter interfaces.

show extended channel slot/port udp-listeners [ip-address]

Display information about the UDP listener sockets on the CMCC adapter interfaces.

show extended channel slot/port udp-stack [ip-address]

Display information about the UDP stack running on the CMCC adapter interfaces.

show interfaces channel slot/port accounting

Display the number of packets for each protocol type that has been sent through the channel interface.

show version

Display the hardware configuration, software version, names and sources of configuration files, and boot images.

Clear and Reset an Interface

To clear the interface counters shown with the show interfaces command, use the following command in EXEC mode:

Command Purpose

clear counters [type slot/port]

Clear interface counters for router.

Note This command will not clear counters retrieved using Simple Network Management Protocol (SNMP), but only those seen with the EXEC show interfaces command.

To clear the counters associated with application features configured on the CMCC adapters, use the following command in EXEC mode:

Command Purpose

clear extended counters channel slot/port [csna | icmp-stack | ip-stack | llc2 | statistics | tcp-connections | tcp-stack | tg | tn3270-server | udp-stack]

Clear counters for application features configured on CMCC adapters.

Note This command will not clear counters retrieved using Simple Network Management Protocol (SNMP), but only those seen with the EXEC show extended channel commands.

Use the following command in EXEC mode to clear and reset interfaces. Under normal circumstances, you do not need to clear the hardware logic on interfaces.

Command Purpose

clear interface type slot/port

Reset the hardware logic on an interface.

Monitor the Physical Channel Interface on the CPA

Unlike the CIP, which has a separate channel interface for the virtual channel functions, the ECPA and PCPA have a single interface that combines the functions of both a physical and virtual channel interface. For this reason, monitoring the physical channel interface on a CPA requires other considerations in its implementation.

In Cisco IOS releases prior to 12.0(4.1), you could not configure how the state of the physical interface on a CPA was tracked, particularly when the interface was configured for no shutdown. In those previous Cisco IOS releases when the CPA channel interface was configured for no shutdown, the channel interface status was always reported as UP/UP, even when no signal was present on the physical connection.

In Cisco IOS release 12.0(4.1) and later, you can use the state-tracks-signal configuration command to control how you want the state of the CPA's channel interface to be reported. The state-tracks-signal command is useful in environments where you are using Hot Standby Router Protocol (HSRP) or SNMP alerts to monitor channel interface status.

Use the following command in interface configuration mode to enable physical interface signal tracking:

Command Purpose

state-tracks-signal

Enables tracking of the physical interface signal for an ECPA or PCPA channel interface.

When the state-tracks-signal command is used on an interface that is configured for no shutdown, then the state of the channel interface is reported according to the status of the physical channel interface signal. If the physical channel interface signal is not present, then the channel interface status is DOWN/DOWN.

When the channel interface is configured for no state-tracks-signal (the default) and no shutdown, the channel interface status is always reported as UP/UP, even when there is no signal present on the physical connection. This configuration is useful for TN3270 server environments that are operating in a mode without any physical channel interface connections.

Shut Down and Restart an Interface

You can disable an interface. Doing so disables all functions on the specified interface and marks the interface as unavailable on all monitoring command displays. This information is communicated to other network servers through all dynamic routing protocols. The interface will not be mentioned in any routing updates. On the CMCC adapter with ESCON interface, a command is sent to the host to inform it of the impending shutdown. On the CMCC adapter's Parallel interface, the shutdown command disables the adapter card's transceivers and the interface stops responding to all commands.

For the following reasons, it is recommended that channel interfaces be shut down:

For a CMCC adapter's ESCON interface, you may want to change the interface type of a Cisco 7000 with RSP7000 or Cisco 7500 port online. To ensure that the system recognizes the new interface type, shut down the interface, then reenable it after changing the interface. Refer to your hardware documentation for more details.
If you want to reload the router
If, prior to reloading the microcode, you want to shut down the interface
If you want to power off the router
If it is recommended that channel interfaces be shut down

To shut down an interface and then restart it, use the following commands in interface configuration mode:

Step Command Purpose

1 .

shutdown

Shut down an interface.

2 .

no shutdown

Reenable an interface.

To check whether an interface is disabled, use the EXEC command show interfaces. An interface that has been shut down is shown as administratively down in the show interfaces command display.

Run CMCC Adapter Interface Loopback Diagnostics

The CMCC adapter does not provide software loopback support. You can use special loopback wrap plugs to perform hardware loopback with the ESCON and Parallel channel interfaces. Hardware loopback information is included in the hardware installation notes for the CMCC adapters.

Configure CMCC Adapter Core Dump

To obtain the output of a CMCC adapter core dump, use the following commands in global configuration mode:

Step Command Purpose

1 .

ip domain-name name

ip name-server address

ip ftp username name

ip ftp password password

Configure the router FTP services.

2 .

exception slot [slot] protocol//:host/filename

Configure the CMCC adapter core dump feature.

Note The exception slot command is only supported on the Cisco 7000 with RSP7000 and Cisco 7500 series routers. On the Cisco 7200 series routers, only FTP is supported.

While the router is running, you can use the write EXEC command to write the contents of a CMCC adapter that is not halted.

Command Purpose

write

Write the contents of a CMCC adapter.

Note The output obtained by the exception slot command can be interpreted by a qualified Cisco technical support person.

Configure TN3270 on a CMCC Adapter

The following sections describe additional features of TN3270 server support on the CMCC adapter.

You will also need to understand the following information before proceeding with TN3270 configuration tasks:

Dynamic LU Allocation

This will be the most common form of request from TN3270 clients emulating a TN3270 terminal. The user typically wants to specify emulating a particular terminal type and normally is not interested in what LOCADDR or LU name is allocated by the host, as long as a network solicitor logon menu is presented. The server will perform the following on such a session request:

Form an EBCDIC string based on the model type and number requested by the client (see "Formation of LU Model Type and Number" on the algorithm used). This string is used as a field in a Reply product set ID (PSID) network management vector transport (NMVT).
Allocate a LOCADDR from the next available LU in the generic LU pool. This LOCADDR is used in the NMVT.
Send the formatted Reply PSID NMVT to VTAM.

When VTAM receives the NMVT, it will use the EBCDIC model type and number string to look up an LU template under the LUGROUP. For example, the string "327802E" will find a match in the sample configuration shown in Figure 174. An ACTLU will be sent and a terminal session with the model and type requested by the client can be established.

Formation of LU Model Type and Number

VTAM requires a model type and number from the Reply PSID NMVT to use as a key to look up in the LU group to find an LU template. The model type is a four character string; the model number is a two or three character string. The server will accept the following formats of terminal type string from the client:

IBM-<XXXX>-<Y>[-E]: This will be formatted as "XXXX0Y"or "XXXX0YE" in the model type and number field in the Reply PSID NMVT.
IBM-DYNAMIC: This will result in "DYNAMIC" being put in the model type and number field. The VTAM configuration will need to have "DYNAMIC" defined as a template in the LU group. In fact "IBM-ZZ..Z," where "ZZ..Z" does not match the preceding syntax, will be forwarded as "ZZ..Z."

Note The "E" in the model string refers to 3270 Extended Datastream. It has no connection with the "E" in "TN3270E".

Any other string is forwarded as is.
In all cases, the string forwarded is translated from ASCII to EBCDIC and truncated at seven characters.

Clients that do not support TN3270E typically require a 3270 datastream on the SSCP-LU flow. Clients that are TN3270E compliant will typically utilize the SNA Character Set (SCS) on the SSCP-LU session. In order to accommodate these two classes of clients, the TN3270 server directs them to different LUGROUP entries at the host. To make this as easy as possible, the SCS requirement is also encoded into the model string sent to the host. Following the previously described terminal type string formats accepted by the server, this additional condition is applied:

If the client has negotiated TN3270E support, the character "S" is overlaid on the fifth character of the string, or appended if the string is less than five characters. See Table 11.

Table 11: Examples of Model String Mapping
String from Client (ASCII) BIND-IMAGE Requested? String to Host (EBCDIC)

IBM-3278-4

No

327804

IBM-3279-5E

No

327905E

IBM-3279-3-E

Yes

3279S5E

IBM-DYNAMIC

Yes

DYNASIC

ABC

Yes

ABCS

ABCDEFGH

Yes

ABCDSFG

Specific LU Allocation

A TN3270E client can request a specific LU name by using the TN3270E command CONNECT as documented in RFC 1647. The name requested must match the name by which the TN3270 server knows the LU (see the section "LU Names in the TN3270 Server"), and the host must have activated the LU (with ACTLU).

LU Names in the TN3270 Server

Where SNA session switching is configured (that is, on DLUR PUs) the TN3270 server learns the LU names from the ACTLUs.

For direct PUs, a "seed" name can be configured on the PU. TN3270 server uses this name in conjunction with the LOCADDRS to generate names for the LUs. It is best to use the same naming convention as the host.

SNA Switching---End Node DLUR

An end node DLUR function is implemented as part of the TN3270 server. The purpose of the DLUR is to allow the routing of TN3270 LUs to multiple VTAM hosts to be performed in the CMCC adapter card rather than on the VTAM hosts. This feature is especially important with the new multi-CPU CMOS mainframe, which comprises up to 16 CPUs that appear as separate VTAMs.

The implementation of TN3270 server LUs under DLUR also allows the server to learn about the LU names on the ACTLU, which greatly simplifies the configuration to support specifically requestable LUs such as printers.

Multiple Hosts Support

The TN3270 server supports access to multiple hosts via the configuration on a PU basis (Table 12). PUs connected to different hosts/applications can be configured with different IP address.

Table 12: Direct PU Configuration in Router
Command PU
Name Idblk IP-address Type Adapter
number Lsap RMAC RMAC Lu-seed Lu-name

PU

X1

05D30001

192.195.80.40

tok

1

4

RMAC

4100.cafe.0001

lu-seed

TN3X1###

PU

X2

05D30002

171.69.176.43

tok

1

8

RMAC

4100.cafe.0002

lu-seed

TN3X2###

From the pu (direct) TN3270 configuration command values shown in Table 12, PU X2 establishes a link to a host at SAP 4 (the default) on MAC address 4100.cafe.0002. A client connecting to IP address 171.69.176.43 is allocated an LU from that PU and is routed to that host.

Note that by using the DLUR function, all the LUs in the server can be defined and owned by a controlling VTAM. When a client requests an application residing on a different VTAM host, the controlling VTAM will issue the request to the target host which will send a BIND directly to the client. All LU-LU data will then flow directly between the target host and the client without needing to go through the controlling VTAM.

IP Type of Service and Precedence Setting

The TN3270 server supports IP type of service (TOS) precedence setting. TOS is used in router networks to make routing decisions for the generated IP packets. The TN3270 server generates packets that comply to IP TOS and IP precedence values. (Refer to RFC 1349 for a description of IP TOS and IP precedence.)

The Cisco implementation of IP precedence allows values of 0 to 7 while TOS allows values from 0 to 15. You must choose appropriate values for TN3270 screens and printers consistent with your organization's policy.

At the protocol level, IP precedence allows a router network to discriminate between different types of traffic by giving different priorities to them. IP TOS allows router networks to discriminate between different types of traffic by giving different routing characteristics to them. Precedence and TOS values complement one another and provide flexibility in managing your network traffic.

In TN3270 server, two types of TN3270 clients connect: interactive screens or printers. Screens are interactive while printers need bulk data transfer. IP TOS and IP precedence allows you to discriminate between those two types of sessions and assign different precedence values to the interactive connection and the bulk data connection.

IP TOS and IP precedence values can be specified either at the TN3270 server command level or on the individual PU command level. Values can be specified on both levels, in which case siftdown will be used to determine value on individual PU. Siftdown is used when you configure values in TN3270 server configuration mode that apply to all entities in the server, yet you still can configure individual PUs at the PU configuration mode to alternative values. PU values not specifically changed use the values configured at the TN3270 server configuration mode. This flexibility provides a powerful, yet efficient, way to manage the values.

VTAM Host Configuration Considerations for Dynamic LU Allocation

Other non-Cisco implementations of TN3270 support depend on predefined, static pools of LUs to support different terminal types requested by the TN3270 clients. The CMCC adapter TN3270 server implementation removes the static nature of these configurations by using a VTAM release 3.4 feature, dynamic definition of dependent LU (DDDLU). (Refer to the VTAM operating system manuals for your host system, under the descriptions for LUGROUP for additional information.) DDDLU dynamically requests LUs using the terminal type provided by TN3270 clients. The dynamic request eliminates the need to define any LU configuration in the server to support TN3270 clients emulating a generic TN3270 terminal.

To support DDDLU, the PUs used by the TN3270 server have to be defined in VTAM with LUSEED and LUGROUP parameters as shown in Figure 174.

Figure 174: VTAM Host Values Defining LUSEED and LUGROUP

Example VTAM host values defining LUSEED and LUGROUP name parameters:

TN3270PU

PU

. IDBLK=05D,

IDNUM=30001,

*

define other PU parameters

LUSEED=TN3X1###,

*

define the seed component of the LU names created by DDDLU (e.g. LOCADDR 42 will have the name TN3X1042)

LUGROUP=AGROUP

*

define the LU group name

*

TN3X1100

LU

LOCADDR=100, MODETAB=AMODETAB

*

define a terminal which requires a specific LU name

*

TN3X1101

LU

LOCADDR=101, DLOGMODE=M3287CS

*

define a printer which requires a specific LU name

Example VTAM host values defining LUGROUPname, AGROUP:

AGROUP

LUGROUP

*

define LU group to support various terminal types

327802E

LU

USSTAB=USSXXX, LOGAPPL=TPXP001, DLOGMOD=SNX32702, SSCPFM=USS3270

*

define template to support IBM 3278 terminal model 2 with Extended Data Stream. Note that the USS messages in USSXXX should be in 3270 datastream.

3278S2E

LU

USSTAB=USSYYY, LOGAPPL=TPXP001, DLOGMOD=SNX32702, SSCPFM=USSSCS

*

define template to support IBM 3278 terminal model 2 with Extended Data Stream, for TN3270E clients requesting BIND-IMAGE.

327805

LU

USSTAB=USSXXX, LOGAPPL=TPXP001, DLOGMOD=D4C32785, SSCPFM=USS3270

*

define template to support IBM 3279 terminal model 5

@

LU

USSTAB=USSXXX, LOGAPPL=TPXP001, DLOGMOD=D4A32772, SSCPFM=USS3270

this is the default template to match any other terminal types

With the configuration shown in Figure 174 defined in the host, the ACTPU sent by VTAM for the PU TN3270PU will have the "Unsolicited NMVT Support" set in the system services control point (SSCP) capabilities control vector. This allows the PU to dynamically allocate LUs by sending network management vector transport (NMVT) with a "Reply Product Set ID" control vector.

After the TN3270 server sends a positive response to the ACTPU, it will wait for VTAM to send ACTLUs for all specifically defined LUs. In the sample configuration shown in Figure 174, ACTLUs will be sent for TN3X1100 and TN3X1101. The server sends a positive response and sets SLU DISABLED. The LOCADDR of these LUs are put into the specific LU cache and reserved for specific LU name requests only.

To allow sufficient time for the VTAM host to send all the ACTLUs, a 30-second timer is started and restarted when an ACTLU is received. When the time expires, it is assumed all ACTLUs defined in VTAM for the PU have been sent. All LUs that have not been activated are available in a generic LU pool to be used for DDDLU unless they have been reserved by the configuration using the generic-pool deny TN3270 configuration command.

After the VTAM activation, the server can support session requests from clients using dynamic or specific LU allocation.

Note If your host computer is customized for a character set other than U.S. English EBCDIC, you might need to code some VTAM configuration tables differently than indicated in the examples provided by Cisco.

Some VTAM configurations include the number sign (#) and at symbol (@). In the U.S. English EBCDIC character set, these characters are stored as the hexadecimal values 7B and 7C, respectively. VTAM will look for those hexadecimal values when processing the configuration file.

The characters used to enter these values are different in other EBCDIC National Language character sets. Table 13 lists the languages that have different characters for the 7B and 7C hexadecimal values and the corresponding symbols used to enter the characters.

For example, the value for the LUSEED parameter in the PU definition called TN3270PU in Figure 174 has a value of TN3X1###. To properly code this value for LUSEED for the French National Language character set, the value should be TN3X1£££.

**Table 13: International Character Sets for Hexadecimal Values**
	Hexadecimal value
	7B		7C
Language	Symbol	Description	Symbol	Description
German	#	Number sign	§	Section symbol
German (alternate)	Ä	A-dieresis	Ö	O-dieresis
Belgian	#	Number sign	à	a-grave
Brazilian	Õ	O-tilde	Ã	A-tilde
Danish/Norwegian	Æ	AE-ligature	Ø	O-slash
English (U.S./UK)	#	Number sign	@	At symbol
Finnish/Swedish	Ä	A-dieresis	Ö	O-dieresis
French	£	Pound sterling	à	a-grave
Greek	£	Pound sterling	§	Section symbol
Icelandic	#	Number sign	D	Uppercase eth
Italian	£	Pound sterling	§	Section symbol
Portuguese	Õ	O-tilde	Ã	A-tilde
Spanish	Ñ	N-tilde	@	At symbol
Turkish	Ö	O-dieresis	S	S-cedilla

LU Address Mapping

Logical unit (LU) address mapping allows a client IP address to be mapped, or "nailed," to one or more LU local addresses on one or more physical units (PUs) by means of router configuration commands. You can control the relationship between the TN3270 client and the LU.

Clients from traditional TN3270 (non-TN3270E) devices can connect to specific LUs, which overcomes a limitation of TN3270 devices that cannot specify a "CONNECT LU." LU nailing is useful for TN3270E clients, because you can perform the configuration at the router, providing central control, rather than at the client.

Handling Large Configurations

The largest size nonvolatile random-access memory (NVRAM) planned for the Cisco 7000, Cisco 7500 and Cisco 7200 series routers is 128 KB. The maximum number of nailing commands that can be stored in a 128 KB NVRAM is approximately 4000. However, large configurations may map as many as 10,000 IP addresses to LUs.

To maintain a configuration file that exceeds 128 KB there are two alternatives. The configuration file can be stored compressed in NVRAM. Or, the configuration file can be stored in Flash memory that is either internal Flash or on a PCMCIA card.

LU Nailing and Model Matching

The "model matching" feature of the CMCC TN3270 server is designed for efficient use of dynamic LUs. Each client specifies a terminal model type at connection. When a non-nailed client connects and does not request a specific LU, the LU allocation algorithm attempts to allocate an LU that operated with that terminal model the last time it was used. If no such model is available, the next choice is an LU that has not been used since the PU was last activated. Failing that, any available LU is used; however, for dynamic LUs only, there is a short delay in connecting the session.

Where a client or set of clients is nailed to a set of more than one LU, the same logic applies. If the configured LU nailing maps a screen client to a set of LUs, the LU nailing algorithm attempts to match the client to a previously used LU that was most recently used with the same terminal model type as requested by the client for this connection. If a match is found, that LU is used. If a match is not found, any LU in the set that is not currently in use is chosen. If there is no available LU in the set, the connection is rejected.

For example, the following LUs are nailed to clients at address 192.195.80.40, and LUs BAGE1004 and BAGE1005, which were connected but are now disconnected.

lu    name   client-ip:tcp       nail state    model   frames in out    idle for
1   BAGE1001 192.195.80.40:3822   Y   P-BIND   327904E  4       4       0:22:35
2   BAGE1002 192.195.80.40:3867   Y   ACT/SESS 327904E  8       7       0:21:20
3   BAGE1003 192.195.80.40:3981   Y   ACT/SESS 327803E  13      14      0:10:13
4   BAGE1004 192.195.80.40:3991   Y   ACT/NA   327803E  8       9       0:0:7
5   BAGE1005 192.195.80.40:3997   Y   ACT/NA   327805   8       9       0:7:8

If a client at IP address 192.195.80.40 requests a terminal model of type IBM-3278-5, LU BAGE1005 will be selected over BAGE1004.

lu    name   client-ip:tcp       nail state    model   frames in out    idle for
1   BAGE1001 192.195.80.40:3822   Y   P-BIND   327904E  4       4       0:23:29
2   BAGE1002 192.195.80.40:3867   Y   ACT/SESS 327904E  8       7       0:22:14
3   BAGE1003 192.195.80.40:3981   Y   ACT/SESS 327803E  13      14      0:11:7
4   BAGE1004 192.195.80.40:3991   Y   ACT/NA   327803E  8       9       0:1:1
5   BAGE1005 192.195.80.40:4052   Y   ACT/SESS 327805   13      14      0:0:16

TN3270 Configuration Modes

The TN3270 configuration modes and router command prompts are described in the following sections and displayed in Figure 175. The TN3270 server can be configured only on the virtual interface of a CMCC adapter.

Some configuration commands create entities on the CMCC adapter. For most of these, the command changes to the mode associated with that entity (for example, a PU). In general, the parameters provided to create the entity come in two sets: those that identify the specific instance of the entity (for example, a PU name) and those that merely set operating parameters. To return to the mode later, the same command is used but with only the first set of parameters. The tasks in this section clarify how to return to a command mode without necessarily creating a new entity.

To create a DLUR LSAP and enter DLUR LSAP configuration mode, use the following command in TN3270 DLUR configuration mode:

Command Purpose

lsap token-adapter 1 84

Create a DLUR LSAP and enter DLUR LSAP configuration mode.

To return later to the DLUR LSAP configuration mode on the same entity, use the following command in TN3270 DLUR configuration mode:

Command Purpose

lsap token-adapter 1

Enter DLUR LSAP configuration mode on the same LSAP.

To remove an entity, the same identification parameters are needed. Use the following command beginning in TN3270 DLUR configuration mode:

Command Purpose

no lsap token-adapter 1

Remove a previously defined DLUR LSAP entity.

TN3270 configuration modes described in this section include the following:

Figure 175: TN3270 Configuration Modes

TN3270 Server Configuration Mode

From interface configuration mode, tn3270-server command puts you in TN3270 server configuration mode. The following prompt appears:

tn3270-server>

DLUR Configuration Mode

From TN3270 server configuration mode, the dlur command puts you in DLUR configuration mode. The following prompt appears:

tn3270-dlur>

DLUR SAP Configuration Mode

From DLUR server configuration mode, lsap command puts you in DLUR SAP configuration mode. The following prompt appears:

tn3270-dlur-lsap>

PU Configuration Mode

There are two paths to PU configuration mode: from the TN3270 server configuration mode, or from the DLUR configuration mode. In either mode, the pu command puts you in PU configuration mode.

From TN3270 configuration mode, the pu command to create a new PU is:

pu pu-name idblk-idnum ip-address type adapno lsap [rmac rmac] [rsap rsap] [lu-seed lu-name-stem]

From DLUR configuration mode, the pu command to create a new PU is:

pu pu-name idblk-idnum ip-address

From either mode, to return to PU configuration mode on PU pu-name the command is:

pu pu-name

The following prompts appear, depending on which mode you are in:

tn3270-pu>
tn3270-dlur-pu>

Commands Allowed in Multiple Modes

The following commands are valid in TN3270 configuration mode, or in either variation of PU configuration mode:

generic-pool {permit | deny}
idle-time seconds
ip precedence {screen | printer} value
ip tos {screen | printer} value
keepalive seconds
shutdown
tcp-port port-number
unbind-action {keep | disconnect}

Values entered in PU configuration mode override settings made in TN3270 configuration mode. In addition, the no form of these commands entered in PU configuration mode will restore the command value entered in TN3270 command mode.

TN3270 Configuration Task List

The following sections describe how to configure TN3270 server support on a CMCC adapter's virtual interface. Not all tasks are required. Refer to "TN3270 Configuration Examples" for configuration examples.

Task List for Multiple APPN Hosts

When the host site uses APPN and the TN3270 server can reach multiple hosts, we recommend you use DLUR and configure your PUs under DLUR. In this instance, perform the following tasks:

Note You can also use DLUR to reach a mix of APPN and non-APPN hosts. The host owning the PUs must be an APPN network node that also supports the subarea (that is, an interchange node). When an SLU starts a session with any of the APPN hosts, it can use session switching to reach that host directly. When it starts a session with a non-APPN host, the traffic will be routed through the owning host.

Task List for Non-APPN Hosts

When the host site does not use APPN, you configure your PU parameters for a directly-connected host. In this instance, perform the following tasks:

Configure SNA Support

Host connectivity must be configured prior to configuring TN3270 support. This is accomplished in one of three ways:

Configure CSNA support. Refer to the section "Configure CSNA Support".
Configure CMPC support. Refer to the section "Configure CMPC Support."
Configure Token Ring Attachment to a FEP. Refer to the section "TN3270 Configuration Examples."

After the host connection is configured, begin the TN3270 configuration.

Configure TN3270 Server

This task is required. To establish a TN3270 server on the internal LAN interface on the CMCC adapter, use the following commands beginning in global configuration mode:

Step Command Purpose

1 .

interface channel slot/port

Select the channel attach internal LAN interface and enter interface configuration mode.

2 .

tn3270-server

Specify a TN3270 server on the internal LAN interface and enter TN3270 configuration mode.

3 .

maximum-lus max-number-of-lu-allocated

(Optional) Configure maximum number of LUs allowed.

4 .

client [ip [ip-mask]] lu maximum number

(Optional) Configure LU session limits for each client IP address or IP subnetwork address.

5 .

timing-mark

(Optional) Configure transmission of a WILL TIMING-MARK.

6 .

tcp-port port-nbr

(Optional) Assign a TCP port other than the default of 23. This command is also available in PU configuration mode.

7 .

idle-time num-of-seconds

(Optional) Specify the idle time for server disconnect. This command is also available in PU configuration mode.

8 .

keepalive num-of-seconds

(Optional) Specify the maximum time allowed between keepalive marks before the server disconnects. This command is also available in PU configuration mode.

9 .

unbind-action {keep | disconnect}

(Optional) Specify whether the TN3270 session will disconnect when an UNBIND command is received. This command is also available in PU configuration mode.

10 .

generic-pool {permit | deny}

(Optional) Select whether "left-over" LUs can be used from a generic LU pool. This command is also available in PU configuration mode.

11 .

ip precedence {screen | printer} value

(Optional) Specify the precedence level for IP traffic in the TN3270 server.

12 .

ip tos {screen | printer} value

(Optional) Specify the TOS level for IP traffic in the TN3270 server.

When you use the tn3270-server command, you enter TN3270 configuration mode and can use all other commands in the task list. You can later override many configuration values you enter in TN3270 configuration mode from PU configuration mode. On IBM host systems, these types of commands are often referred to as "sift down" commands because their values can sift down through several levels of configuration and can be optionally altered at each configuration level.

Configure IP Precedence

To configure IP precedence, use the following command in TN3270 server or TN3270 PU configuration mode:

Command Purpose

ip precedence {screen | printer} value

Configure the IP level.

Use the no ip precedence screen or the no ip precedence printer commands to return the precedence value to a default of 0.

Configure IP TOS

To configure IP TOS, use the following command in TN3270 server or TN3270 PU configuration mode:

Command Purpose

ip tos {screen | printer} value

Configure the IP TOS delay level.

Use the no ip tos screen or the no ip tos printer commands to return the precedence value to a default of 0.

Configure PU Parameters on the TN3270 Server

This task is required when configuring PUs that do not use DLUR. The first command, pu rmac rsap lu-seed command is required. All other commands are optional. To configure PU parameters for the TN3270 server, use the following commands beginning in TN3270 configuration mode:

Command Purpose

pu pu-name idblk-idnum ip-address type adapno lsap [rmac rmac] [rsap rsap] [lu-seed lu-name-stem]

Enter PU configuration mode and create or delete PUs with direct host links.

tcp-port port-nbr

(Optional) Assign a TCP port other than the default of 23. This command is also available in TN3270 configuration mode.

idle-time num-of-seconds

(Optional) Specify the idle time for server disconnect. This command is also available in TN3270 configuration mode.

keepalive num-of-seconds
Note (Optional) Specify the maximum time allowed between keepalive marks before the server disconnects. This command is also available in TN3270 configuration mode. Note: To enable sending of power-off Reply product set identification (PSID) network management vector transport (NMVT) to the host, the value should be set to 50000 more than the desired value. If the configured value is greater than 50000, the value used for the keepalive function will be 50000 less than the configured value.

unbind-action {keep | disconnect}

(Optional) Specify whether the TN3270 session will disconnect when an UNBIND command is received. This command is also available in TN3270 configuration mode.

generic-pool {permit | deny}

(Optional) Select whether "left-over" LUs can be used from a generic LU pool. This command is also available in TN3270 configuration mode.

ip precedence {screen | printer} value

(Optional) Specify the precedence level for IP traffic in the TN3270 server.

ip tos {screen | printer} value

(Optional) Specify the TOS level for IP traffic in the TN3270 server.

When you use the pu command, you enter PU configuration mode and can use all other commands in this task list. Configuration values you enter in PU configuration mode will override other values entered while in TN3270 configuration mode. In addition, you can enter PU configuration mode from DLUR configuration mode when configuring PUs that are connected by means of DLUR.

If you are configuring PUs for directly connected hosts, you need not perform any additional configuration tasks.

Configure DLUR

This task is required when configuring DLUR connected hosts. To configure DLUR parameters for the TN3270 server, use the following commands beginning in TN3270 configuration mode:

Step Command Purpose

1 .

dlur fq-cpname fq-dlusname

Create a DLUR function in the TN3270 server and enter DLUR configuration mode.

2 .

dlus-backup dlusname2

(Optional) Specify the fallback choice for the DLUR DLUS.

3 .

preferred-nnserver NNserver

(Optional) Specify the preferred network node (NN) server.

4 .

client [printer] ip ip-address [mask] lu first-locaddr [last-locaddr]

(Optional) Configure the IP address and nail type and specify the locaddr range.

Configure SAPs under DLUR

To configure SAPs under the DLUR function, use the following commands beginning in DLUR configuration mode:

Step Command Purpose

1 .

lsap type adapno [lsap]

Create a SAP function under DLUR and enter DLUR SAP configuration mode.

2 .

vrn vrn-name

(Optional) Identify an APPN virtual routing node (VRN).

3 .

link name [rmac rmac] [rsap rsap]

(Optional) Create named links to hosts. A link should be configured to each potential NN server. (The alternative is to configure the NN servers to connect to DLUR.) If VRN is used it is not necessary to configure links to other hosts. Do not configure multiple links to the same host.

4 .

client [printer] ip ip-address [mask] lu first-locaddr [last-locaddr]

(Optional) Configure the IP address and nail type and specify the locaddr range.

Configure PUs under DLUR

This task is required when configuring DLUR connected hosts. To configure PUs under the DLUR function, use the following commands beginning in DLUR configuration mode:

Step Command Purpose

1 .

pu pu-name idblk-idnum ip-address

Create a PU function under DLUR and enter PU configuration mode.

2 .

tcp-port port-nbr

Assign a TCP port other than the default of 23.

3 .

idle-time num-of-seconds

Specify the idle time for server disconnect.

4 .

keepalive num-of-seconds

Specify the maximum time allowed between keepalive marks before the server disconnects.

5 .

unbind-action {keep | disconnect}

Specify whether the TN3270 session will disconnect when an UNBIND command is received.

6 .

generic-pool {permit | deny}

Select whether "left-over" LUs can be used from a generic LU pool.

7 .

ip precedence {screen | printer} value

(Optional) Specify the precedence level for IP traffic in the TN3270 server.

8 .

ip tos {screen | printer} value

(Optional) Specify the TOS level for IP traffic in the TN3270 server.

9 .

client [printer] ip ip-address [mask] lu first-locaddr [last-locaddr]

(Optional) Configure the IP address and nail type and specify the locaddr range.

The pu command entered in DLUR configuration mode has different parameters than when it is entered from TN3270 configuration mode.

Configure LU Nailing

To configure LU nailing, use the following command in TN3270 PU configuration mode :

Command Purpose

client [printer] ip ip-address [mask] lu first-locaddr [last-locaddr]

Configure the IP address and nail type and specify the locaddr range.

The client command allows a client with multiple TN3270 connections from the same IP address to nail their screen connections to LUs that are configured as screen LUs at the host and to nail printer connections to LUs that are configured as printers at the host. When the connection is made, a device type of "328*" is matched to a printer definition, and any other device type is matched to a screen definition.

Monitor the TN3270 Server

The following table lists the monitoring commands specific to the TN3270 server. To display the full list of show commands, enter show ? at the EXEC prompt.

Use the following commands in privileged EXEC mode:

Command Purpose

show extended channel slot/port tn3270-server

Display the current server configuration parameters and the status of the PUs defined in each server.

show extended channel slot/port tn3270-server client-ip-address ip-address [disconnected | in-session | pending]

Display information about all clients at a specific IP address.

show extended channel slot/port tn3270-server pu-name

Display the PU configuration parameters, statistics and all the LUs currently attached to the PU.

show extended channel slot/port tn3270-server pu pu-name lu locaddr [history]

Display information about the TN3270 server LUs running on a CMCC adapter interface.

show extended channel slot/port tn3270-server nailed-ip ip-address

Display mappings between a nailed client IP address and nailed LUs

show extended channel tn3270-server pu-name lu lu-number [history]

Display the status of the LU.

show extended channel tn3270-server client-ip-address ip-address

Display the information about LUs that are defined under an IP address.

show extended channel slot/port tn3270-server dlur

Display information about the SNA session switch.

show extended channel slot/port tn3270-server dlurlink name

Display information about the DLUR components.

Configure CMPC Support

Cisco MultiPath Channel (CMPC) is Cisco System's implementation of IBM's MultiPath Channel (MPC) feature. CMPC allows VTAM to establish Advanced-Peer-to-Peer Networking (APPN) connections using both High Performance Routing (HPR) and Intermediate Session Routing (ISR) through a chan nel-attached router platforms.

With CMPC, Cisco 7000 with RSP7000, Cisco 7500, and Cisco 7200 series routers can be deployed in Parallel MVS systems complex (sysplex) configurations.

CMPC can be used to establish an APPN connection between VTAM and the following APPN nodes:

Another VTAM channel attached to the same CMCC adapter
Another VTAM channel attached to a different CMCC adapter in the same router
TN3270 server DLUR in the same CMCC adapter
APPN network node (NN) in the router with the CMCC adapter
Other APPN nodes external to the CMCC adapter and router with the CMCC adapter: CS/2, AS/400, other LAN or WAN attached VTAM hosts

One read subchannel and one write subchannel are supported for each MPC transmission group. The read subchannel and write subchannel may be split over two physical channel connections on the same CMCC adapter.

CMPC insulates VTAM from the actual network topology. The MPC protocols are terminated on the CMCC adapter and converted to LLC protocols. After they are converted to LLC protocols, other Cisco features can be used to connect VTAM to other APPN nodes in the network. CMPC can be used in conjunction with DLSw+, RSRB, SR/TLB, SRB, SDLLC, QLLC, ATM LAN emulation, and FRAS host to provide connectivity to VTAM.

CMPC supports connections to PU 2.1 nodes: APPN NN, APPN EN, and LEN. Subarea connections are not supported.

The CMPC feature coexists on a CMCC adapter with the TCP/IP Offload, IP Datagram, TN3270, and CSNA features.

CMPC Requirements

The following are minimum host system requirements to support CMPC:

VTAM V4.2+, for MPC APPN ISR connections
VTAM V4.3+, for MPC APPN HPR connections

CMPC Configuration Overview

To configure the CMPC feature, you must configure the host VTAM parameters and the CMCC adapter. The CMPC Configuration Examples for CMPC show the VTAM configuration parameters and the router configuration commands for each example.

The following guidelines will help you prepare for CMPC configuration:

A CMPC link uses two subchannels: one read and one write. Some IBM implementations of MPC allow multiple read and multiple write subchannels. CMPC will not support multiple read and write subchannels. Only one read subchannel and one write subchannel can be configured for each CMPC link. A CMPC link is also referred to as a CMPC transmission group.
Multiple CMPC links can be configured between the host and the CMCC adapter in the Cisco 7500, 7000, or 7200 series router.
The two subchannels in a CMPC link need not be adjacent devices. Either channel may be the read subchannel and either channel may be the write subchannel. The two subchannels can be on separate channel process IDs in the host.
The two subchannels must be connected to the same CMCC adapter, however they do not have to be connected to the same physical channel interface. In other words, it is possible to connect a read subchannel to channel interface 0, while the write subchannel is connected to the channel interface.
Only APPN connections will be supported across CMPC. For this reason when TN3270 server is configured with CMPC, it must be configured as an APPN end node with DLUR.
You must know what device addresses you will be using and the associated channel path statements.
You must know whether or not you will use HPR.
To configure the LLC2 interface for the CMCC adapter, you will need to choose a local MAC address and a local SAP address.
You must know the remote MAC address and remote SAP of the LLC2 peer with which the CMPC communicates.
You must know how to configure source-bridge ring groups on the CMCC adapter.
On the router, the combination of one read subchannel definition, one write subchannel definition, and a transmission group definition, associated by a unique tg-name, makes up a CMPC transmission group specification.

To help clarify the configuration process, refer to Figure 176, which shows the CMPC link between the VTAM host, the router, and CMCC adapter card, and the communication to the LLC2 end point. The read and write addresses defined in the VTAM host correspond to the read and write paths defined for CMPC. CMPC communicates with the LLC2 stack, which communicates to the end point of the connection by means of the IEEE 802.2 link.

Figure 176: Logical View of CMPC Link

Configuration Tasks

This section describes the following configuration tasks associated with the CMPC feature. The first two tasks are performed on the VTAM host. The remaining tasks are performed on the router. All tasks are required.

Configure the VTAM Transport Resource List Major Node

To configure MPC on the host, define the Transport Resource List (TRL) major node. See the following IBM documents for details on how to configure the TRL major node:

VTAM Resource Definition Samples, SC31-6554
VTAM Operation, SC31-6549
VTAM Network Implementation Guide, SC31-6548

The following is an example of a typical configuration:

LAGTRLA  VBUILD TYPE=TRL
LAGTRLEA  TRLE  LNCTL=MPC,MAXBFRU=8,REPLYTO=3.0,                       X
READ=(2F0),                                             X
WRITE=(2F1)

In this example, device 2F0 has been configured for read and 2F1 has been configured for write. The command to activate the TRL should be issued before activating the Local node. If your TRL data set was named LAGTRLA, the activate command would be as follows:

v net,act,id=lagtrla,update=add

where the ID parameter refers to the name of the data set containing the TRL definition.

Note that "update=add" is preferred and is the default for later versions of VTAM. The argument "update=all" can cause inactive TRLEs to be deleted unexpectedly from ISTTRL. However, "update=all" must be used if you change an active TRL data set and wish the changes to become active. The following commands are useful for displaying the current list of TRLEs:

d net,trl
d net,id=isttrl,e
d net,trl,trle=trle_name

Configure the VTAM Local SNA Major Node

To configure the MPC channel link on the VTAM host, define the local SNA major node.

The following is an example of a typical configuration:

LAGLNA   VBUILD TYPE=LOCAL
 LAGPUA    PU  TRLE=LAGTRLEA,                                          X
               ISTATUS=ACTIVE,                                         X
               XID=YES,CONNTYPE=APPN,CPCP=YES,HPR=YES

The TRLE parameter in the local node refers to the label on the TRLE statement from the TRL major node LAGTRLA. Also, if you do not want to run HPR set the HPR parameter to "NO." The local SNA major node must be activated after the TRL node has been activated. If your local node data set was named LAGLNA, the activate command is as follows:

v net,act,id=laglna

Configure the CMPC Subchannels

To define a CMPC read subchannel and CMPC write subchannel, use the following commands in interface configuration mode on a CMCC adapter physical interface:

Step Command Purpose

1 .

cmpc path device tg-name read

Configure the CMPC read subchannel.

2 .

cmpc path device tg-name write

Configure the CMPC write subchannel.

These statements define the subchannel addresses that CMPC will use to connect to the host, and correspond to the definitions in the TRL major network node on the host. Specifically the last two hexadecimal digits in the read parameter match the device value configuration in the cmpc command. The last two hexadecimal digits in the write parameter match the device value in the cmpc command.

Use the no cmpc path device command to remove the definition of a subchannel.

Configure the CMPC Transmission Groups

To define a CMPC transmission group by name and specify its connection to the LLC2 stack, use the following command in interface configuration mode on a CMCC adapter virtual interface:

Command Purpose

tg tg-name llc type adaptno lsap [rmac rmac] [rsap rsap]

Define the CMPC transmission group name.

The tg command defines an LLC connection with a complete addressing 4-tuple. The lsap, rmac, and rsap are specified explicitly by parameters. The lmac is the LMAC of the adapter referred to by the type and adaptno parameters.

The tg-name must match the name given in the cmpc command issued in the physical interfaces on the same CMCC adapter.

Use the no tg command to remove a CMPC transmission group from the configuration, which will deactivate the named CMPC transmission group.

To change any parameter of the tg statement, the statement must be removed by using the no tg tg-name command.

Configure the CMCC Adapter Internal LAN for CMPC

Configuring CMPC support on the CMCC adapter internal LAN is similar to configuring CSNA support. Many of the configuration tasks are the same. To configure the internal LAN adapter on the CMCC adapter to support CMPC, perform the following tasks:

Configure the CMCC Adapter Internal LANs

To select a CMCC adapter internal LAN interface, use the following commands beginning in global configuration mode:

Step Command Purpose

1 .

interface channel slot/port

Select the virtual interface.

2 .

lan tokenring lan-id

Select the internal LAN interface and enter internal LAN configuration mode.

Use the no lan command to disconnect all LLC2 sessions established through all internal LAN interfaces configured on a particular internal LAN.

Up to 18 internal adapters can be configured on a CMCC adapter.

Configure SRB

Select the bridging characteristics for Token Ring and FDDI, or Ethernet. Use the following command in internal LAN configuration mode:

Command Purpose

source-bridge local-ring bridge-number target-ring

Select source-route bridging for the selected LAN interface.

Configure Internal Adapters

Name the Internal Adapter

Select a name for the internal adapter. Use the following command in internal adapter configuration mode:

Command Purpose

name name

Select a name for the internal adapter.

Naming an internal adapter is optional.

Configure the Internal Adapter and Its Link Characteristics

To configure the link characteristics of the internal LAN adapter, use the following commands in internal LAN configuration:

Command Purpose

llc2 N1 bytes

Maximum size of an I-frame in bytes.

llc2 N2 retry-count

Maximum retry count.

llc2 Nw window-size-increase

Increase the window size for consecutive good I-frame received (zero is disabled).

llc2 ack-delay-time milliseconds

Maximum time for incoming I-frames to stay unacknowledged.

llc2 ack-max frame-count

Maximum number of I-frames received before an acknowledgment must be sent.

llc2 idle-time milliseconds

Frequency of polls during periods of idle traffic.

llc2 local-window frame-count

Maximum number of I-frames to send before waiting for an acknowledgment.

llc2 recv-window frame-count

Receive window.

llc2 t1-time milliseconds

Specify amount of time to wait for an acknowledgment to transmit I-frames.

llc2 busy-time milliseconds

Amount of time to wait while the other LLC2 station is in a busy state before attempting to poll the remote station.

llc2 tpf-time milliseconds

Amount of time to wait for a final response to a poll frame before resending the original poll frame.

llc2 trej-time milliseconds

Amount of time to wait for resending a rejected frame before sending the reject command.

Configuring LLC parameters is optional. Default values are used when no parameters are configured.

CMCC Interface Configuration Examples

The following sections include examples to help you understand some aspects of interface configuration:

CPA Microcode Load Example

The following example copies a new image to Flash memory:

router#copy tftp:xcpa26-2 slot0:xcpa26-2
 
Address or name of remote host []? neptune
Translating "neptune"...domain server (10.20.30.10) [OK]
Destination filename [xcpa26-2]? 
Accessing tftp://neptune/xcpa26-2...
Loading motto/xcpa26-2 from 10.20.30.10 (via FastEthernet0/0): !
  Expanding slot0:xcpa26-2_kernel_xcpa (343148 bytes): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_seg_802 (237848 bytes): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_seg_cmpc (319960 bytes): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_seg_csna (89856 bytes): !!!!!!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_seg_eca (461424 bytes): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_seg_offload (80344 bytes): !!!!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_seg_pca (69376 bytes): !!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_pseg_push (15936 bytes): !!!
  Expanding slot0:xcpa26-2_seg_tcpip (158896 bytes): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  Expanding slot0:xcpa26-2_seg_tn3270 (601784 bytes): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 2387456/4774912 bytes]
2387456 bytes copied in 110.588 secs (21704 bytes/sec)
router#

After copying a CMCC ucode image to flash memory, a directory command of the flash device displays the following:

Router#dir slot0:
 
Directory of slot0:/
  1  -rw-           1   Aug 18 1998 12:29:12  xcpa26-2
  2  -rw-      344438   Aug 18 1998 12:29:12  xcpa26-2.kernel_xcpa
  3  -rw-      237848   Aug 18 1998 12:29:37  xcpa26-2.seg_802
  4  -rw-      319960   Aug 18 1998 12:29:56  xcpa26-2.seg_cmpc
  5  -rw-       89856   Aug 18 1998 12:30:15  xcpa26-2.seg_csna
  6  -rw-      461424   Aug 18 1998 12:30:20  xcpa26-2.seg_eca
  7  -rw-       80344   Aug 18 1998 12:31:03  xcpa26-2.seg_offload
  8  -rw-       69376   Aug 18 1998 12:31:07  xcpa26-2.seg_pca
  9  -rw-       15936   Aug 18 1998 12:31:11  xcpa26-2.seg_push
 10  -rw-      158896   Aug 18 1998 12:31:12  xcpa26-2.seg_tcpip
 11  -rw-      601784   Aug 18 1998 12:31:32  xcpa26-2.seg_tn3270
7995392 bytes total (5614116 bytes free)

The following example loads the microcode from an individual microcode image that is stored as a file in Flash memory:

Router(config)# microcode ecpa slot0:xcpa26-2 
Router(config)# microcode reload

IP Address and Network Mask Configuration Example

The following example assigns an IP address and network mask to the IBM channel attach interface on the router:

ip address 197.91.2.5 255.255.255.0

CLAW Configuration Example

The following example configures the IBM channel attach interface to support a directly connected device:

claw 0100 00 197.91.2.2 VMSYSTEM C7000 TCPIP TCPIP

CLAW Packing Configuration Examples

The following example configures the IBM channel attach interface to support CLAW packing on HOSTA and HOSTC and the nonpacked version of CLAW on HOSTB:

interface Channel0/0
 
ip address 172.18.4.49 255.255.255.248
no keepalive
claw C010 F2 172.18.4.50 HOSTA RTRA PACKED PACKED
claw C020 F4 172.18.4.52 HOSTB RTRA TCPIP TCPIP 
claw C030 F6 172.18.4.53 HOSTC RTRA PACKED PACKED

The following is an example of a CLAW definition in the host configuration file for IOS/390:

000100 *---------------------------------------------
000200 * Member: IOS390R2.V510.PARM(TCPCFGxx)
000300 * Description: TCP task group configuration 
000400 *---------------------------------------------
000500
000600 * Define the virtual medium
000700
000800 MEDIA VIRTUAL MTU(4096) NAME(LOOPBACK)
000900
001000 * Define the physical medium
001100
001200 MEDIA CLAW    MTU(4096) NAME(ROGCLAW) ASSIST
001300
001400 * Define the host
001500
001600 NETWORK IPADDRESS(172.18.4.50)
001700      SUBNET(255.255.255.248)
001800
001900 *
002000
002100 CLAW DEVADDR(8f2)
002200      BUFSIZE(32768)
002300      IBUF(5)
002400      OBUF(5)
002500      RESTART(60)
002600      HOSTNAME(HOSTA)
002700      WSNAME(RTRA)
002800      START
002900      PACKED
003000
003100 * Define gateway
003200
003300 ROUTE DEST(0.0.0.0) ROUTE(172.18.4.49)
003400
003500 * Define the transport pr
003600
003700 TCP  MAXRCVBUF(131072)
003800      MAXSNDBUF(131072)
003900      DEFRCVBUF(131072)
004000      DEFSNDBUF(131072)
004100      DELAYACK(2)
004200      FASTRX(3)
004300      MAXRXMIT(18)
004400      MINDEV(90)
004500      PORTUSE(1:4095)
004600      PORTASGN(4096:8191)
004700
004800 UDP  MAXRCVBUF(64000)005200      PORTUS
004900      MAXSNDBUF(64000)
005000      DEFRCVBUF(64000)
005100      DEFSNDBUF(64000)005300      PORTAS
005200      PORTUSE(1:4095)
005300      PORTASGN(4096:8191)
005400
005500 RAW  MAXRCV
005600      MAXSND
005700

Offload Configuration Example

The following example consists of the mainframe host profile statements, buffer poolsize recommendations, and router configuration statements for the network shown in Figure 177.

Figure 177: Offload Network Configuration Block Diagram

Host Profile Statements

; Device statement
DEVICE OFF CLAW 762 CISCOVM CIP1 NONE 20 20 4096 4096
!
; Link Statements (both needed)
LINK OFFL OFFLOADLINK1 1 OFF
LINK MEMD OFFLOADAPIBROAD 162.18.4.59 OFF OFFL
!
; Home Statement
; (No additional home statements are added for offload)
!
!
; Routing information (if you are not using the ROUTED SERVER)
GATEWAY
; NETWORK FIRST HOP  DRIVER    PCKT_SZ    SUBN_MSK       SUBN_VALUE
162.18         =      MEMD     4096       0.0.255.248      0.0.4.56
DEFAULTNET     =      MEMD     1500       0
!
;START statements
START OFF
!

Router Configuration Statements

The following statements configure the offload feature in the router. When you configure a host-to-host communication through the same channel interface, include the no ip redirects and ip route-cache same-interface commands:

interface Channel0/0 
 ip address 162.18.4.57 255.255.255.248 
 no ip redirects 
 ip route-cache same-interface 
no keepalive 
 offload C300 62 162.18.4.59 CISCOVM CIP1 TCPIP TCPIP TCPIP API

CSNA Configuration Example

The following configuration is an example of configuring CSNA on a Cisco 7500 router with a CIP. Figure 178 illustrates this configuration example.

Figure 178: CIP CSNA Internal LAN Network Diagram

source-bridge ring-group 2000
source-bridge transparent 2000 444 1 1
dlsw remote-peer 0 tcp 10.30.3.1
dlsw local-peer peer-id 10.30.2.2
! 
interface serial 1/0
 ip address 10.30.2.2 255.255.255.128
 clockrate 56000
!  
interface tokenring 2/0
 mac-address 4000.7500.0200
 no ip address
 ring-speed 16
 source-bridge 120 1 2000
 source-bridge spanning
!  
interface ethernet 3/0
 mac-address 0200.ae00.c000
 no ip address
 bridge-group 1
!  
interface channel 4/0
 no ip address
 no ip directed-broadcast
 no keepalive
 csna 0100 80
!  
interface channel 4/1
 no ip address
 no ip directed-broadcast
 no keepalive
 csna E200 20 maxpiu 65535 time-delay 100
! 
interface channel 4/2
 no ip address
 no ip directed-broadcast
 no keepalive
 max-llc2-sessions 2500
 lan TokenRing 3
  source-bridge 142 1 2000
  adapter 0 4000.7500.4230
   llc2 local-window 1
   llc2 ack-max 1
  adapter 1 4000.7500.4231
 lan TokenRing 4
  adapter 7 4000.7500.4234
  adapter 8 4000.7500.4238
! 
bridge 1 protocol ieee

ECPA CSNA Configuration Example

The following configuration is an example of configuring CSNA on a Cisco 7200 router with a ECPA. Figure 179 illustrates this configuration example.

Figure 179: ECPA CSNA Translational Bridging Configuration Example

source-bridge ring-group 2000
source-bridge transparent 2000 444 1 1
dlsw remote-peer 0 tcp 10.30.3.1
dlsw local-peer peer-id 10.30.2.2
! 
interface serial 1/0
 ip address 10.30.2.2 255.255.255.128
 clockrate 56000
!  
interface tokenring 2/0
 mac-address 4000.7500.0200
 no ip address
 ring-speed 16
 source-bridge 120 1 2000
 source-bridge spanning
!  
interface ethernet 3/0
 mac-address 0200.ae00.c000
 no ip address
 bridge-group 1
!  
interface channel 4/0
 no ip address
 no ip directed-broadcast
 no keepalive
 csna E200 30 maxpiu 65535
 CSNA E200 40 maxpiu 65535
 max-llc2-sessions 2500
 lan TokenRing 3
  source-bridge 142 1 2000
  adapter 0 4000.7500.4230
   llc2 local-window 1
   llc2 ack-max 1
  adapter 1 4000.7500.4231
 lan TokenRing 4
  adapter 7 4000.7500.4234
  adapter 8 4000.7500.4238
! 
bridge 1 protocol ieee

TN3270 Configuration Examples

The following configuration has three PUs using DLUR and two more with direct connections.

The initial CIP configuration is as follows:

interface Channel2/2
ip address 10.10.20.126 255.255.255.128
no ip redirects
no ip directed-broadcast
no keepalive
lan TokenRing 0
source-bridge 223 1 2099
adapter 0 4100.cafe.0001
llc2 N1 2057
adapter 1 4100.cafe.0002
llc2 N1 2057

Configuration dialog to configure the TN3270 function follows:

! HOSTA is channel-attached and will open SAP 8 on adapter 0.
! HOSTB is reached via token-ring
! HOSTC is channel-attached non-APPN and will open SAP 4 on adapter 0.
 
! enter interface configuration mode for the virtual interface in slot 2
router(config)#int channel 2/2
 
! create TN3270 Server entity
router(config-if)#tn3270-server
 
! set server-wide defaults for PU parameters
router(cfg-tn3270)#keepalive 0
router(cfg-tn3270)#unbind-action disconnect
router(cfg-tn3270)#generic-pool permit
 
! define DLUR parameters and enter DLUR configuration mode
router(cfg-tn3270)#dlur SYD.TN3020 SYD.VMG
 
! create PUs under DLUR
! Note that the first two share an IP address
router(tn3270-dlur)#pu pu0 05d99001 10.10.20.1
router(tn3270-dlur-pu)#pu pu1 05d99002 10.10.20.1
router(tn3270-dlur-pu)#pu pu2 05d99003 10.10.20.2
 
! create a DLUR LSAP and enter DLUR LSAP configuration mode
router(tn3270-dlur-pu)#lsap token-adapter 1
 
! specify the VRN name of the network containing this lsap
router(tn3270-dlur-lsap)#vrn syd.lan4
 
! create a link from this lsap
router(tn3270-dlur-lsap)#link hosta rmac 4100.cafe.0001 rsap 8
router(tn3270-dlur-lsap)#link hostb rmac 4000.7470.0009 rsap 4
router(tn3270-dlur-lsap)#exit
router(tn3270-dlur)#exit
 
! create direct pus for the non-APPN Host
! note that they must use different lsaps because they go to the same Host
router(cfg-tn3270)#pu pu3 05d00001 10.10.20.5 tok 1 24 rmac 4100.cafe.0001 lu-seed pu3###
router(tn3270-pu)#pu pu4 05d00002 10.10.20.5 tok 1 28 rmac 4100.cafe.0001 lu-seed pu4###
router(tn3270-pu)#end

The resulting configuration from the initial configuration and the configuration dialog follows:

interface Channel2/2
ip address 10.10.20.126 255.255.255.128
no ip redirects
no keepalive
lan TokenRing 0
source-bridge 223 1 2099
adapter 0 4100.cafe.0001
llc2 N1 2057
adapter 1 4100.cafe.0002
llc2 N1 2057
tn3270-server
pu PU3      05D00001 10.10.20.5    token-adapter 1  24 rmac 4100.cafe.0001 lu-seed PU3###
pu PU4      05D00002 10.10.20.5    token-adapter 1  28 rmac 4100.cafe.0001 lu-seed PU4###
dlur SYD.TN3020 SYD.VMG
lsap token-adapter 1 
vrn SYD.LAN4 
link HOSTB    rmac 4000.7470.0009
link HOSTA    rmac 4100.cafe.0001 rsap 08
pu PU0      05D99001 10.10.20.1
pu PU1      05D99002 10.10.20.1
pu PU2      05D99003 10.10.20.2

Configure TN3270 DLUR with CMPC Host Connection

The following example shows a DLUR PU with a CMPC host connection.

interface Channel0/0
 no ip address
 no keepalive
 cmpc C010 E5 LPAR1TG READ
 cmpc C010 E6 LPAR1TG WRITE
 cmpc C020 00 LPAR2TG READ
 cmpc C020 01 LPAR2TG WRITE
!
interface Channel0/2
 ip address 172.18.5.1 255.255.255.224
 no keepalive
 lan TokenRing 0
  source-bridge 100 1 8
  adapter 0 4000.4040.0000 ! for cmpc
  adapter 1 4000.6060.0000 ! TN3270 server
  adapter 2 4000.7070.0000
 tn3270-server
  maximum-lus 20000 ! optional
  idle-time 64800 ! optional
  timing-mark ! optional
  tcp-port 24 ! optional
  client 10.10.10.0 255.255.255.0 lu maximum 10000 ! optional
  dlur NETA.TN3270CP NETA.CPAC
   dlus-backup NETA.MVS2 ! optional
   preferred-NNserver NETA.CPAC ! optional
   lsap token-adapter 1 04 ! TN3270 server uses cmcc adapter 1 and sap=04
    link LINK1 rmac 4000.4040.0000 rsap 08 ! link to cmpc on adapter 0
   lsap token-adapter 2 04
    link LINK2 rmac 4000.7070.0000 rsap 08 ! link to cmpc on adapter 2
   pu TNPU1 0175 4321 172.18.5.2
!
tg LPAR1TG llc token-adapter 0 08 rmac 4000.6060.0000 rsap 04 ! rsap optional
tg LPAR2TG llc token-adapter 2 08 rmac 4000.7070.0000 ! rsap=04 by default"

Static and Dynamic LUs with LU Nailing Configuration Example

The following example shows a direct PU and a DLUR PU configured with the same listening point. The PUs are configured with the same nailed client IP address.

tn3270-server
pu PU1 05D18081 172.28.1.82 token-adapter 1  24 rmac 4100.cafe.0001 lu-seed PU3###
client ip 192.195.80.40 lu 1 10
dlur
pu PU2 05D190B3 172.28.1.82 token-adapter 1  28 rmac 4100.cafe.0001 lu-seed PU4###
client ip 192.195.80.40 lu 1 10

Assuming each PU has three static LUs, which are ACTLU enabled and not connected, then these LUs are the first to be nailed. That is, the first six connections from client IP address 192.195.80.40 use the static LUs and subsequent connections use the remaining dynamic LUs.

Removing LU Nailing Definitions Example

In the following example, locaddrs 1 to 50 are reserved for all remote screen devices in the 171.69.176.0 subnet.

interface channel 2/2
tn3270-server
pu BAGE4
client ip 171.69.176.28 255.255.255.0 lu 1 50

To remove a nailing definition, the complete range of locaddrs must be specified as configured. So for the example above, the following command would remove the LU nailing definition.

no client ip 171.69.176.28 255.255.255.0 lu 1 50

If an attempt is made to remove a subset of the range of configured locaddrs then the command is rejected.

no client ip 171.69.176.28 255.255.255.0 lu 1 20
% client ip 171.69.176.28 lu not matched with configured lu 1 50

Configuring Different Values for Precedence and TOS Example

The following example changes IP precedence and IP TOS to different values under the TN3270 server for both the screen and printer. Note that any PUs defined under this configuration will inherit these values unless the corresponding parameter is specifically changed for that PU.

interface channel 3/2
tn3270-server
ip precedence screen 6
ip precedence printer 3
ip tos screen 8
ip tos printer 4

Overriding Configured Values Example

In the following example, the PU PUS1 uses the IP TOS precedence screen and printer values from the values provided in TN3270 server configuration mode. PUS2 uses the IP TOS screen and printer values defined in TN3270 server configuration mode. However, different values for IP precedence are provided for PUS2 under PU configuration mode.

interface channel 3/2
tn3270-server
ip precedence screen 6
ip precedence printer 3
ip tos screen 8
ip tos printer 4
pu PUS1     05D18009 172.28.1.101    token-adapter 0  AC rsap 08
pu PUS2     05D18071 172.28.1.99     token-adapter 0  A4 rmac 4000.7470.00e7
ip precedence screen 7
ip precedence printer 0

Configure IP Host Backup Example

Figure 180 shows the backup connection occurring between System B mainframe3 when mainframe 2 fails.

Figure 180: IP Host Backup Configuration

The intent of this backup configuration is that the system named A will be loaded on one of the mainframes in LPAR1 on that mainframe. The DASD for that system will be shared among all the mainframes but only one of them will ever IPL the system at one time. The same holds for LPAR2 and LPAR3.

The ESCON director has the following connections:

A Cisco 7500 series router with a CIP connected to port C5
Mainframe1 connected to C0
Mainframe2 connected to C1
Mainframe3 connected to C2

The following examples show how to configure IP Host Backup for three mainframe hosts, Mainframe 1, Mainframe 2, and Mainframe 3, as shown in Figure 180. Each mainframe is configured for at least three logical partitions (LPARs).

Excerpts from the host TCP/IP profiles show how the host might be configured. Excerpts from the router configuration show how the IP Host Backup configuration statements are configured.

Host TCP/IP Profiles

The DEVICE and HOME statements in the nine TCP/IP profiles are similar to the following:

LPAR1 (mainframes 1, 2, 3):
DEVICE CIP1 CLAW 630 LPAR1 CIP1 NONE 20 20 4096 4096
LINK CIP1L IP 0 CIP1
HOME
 198.92.5.2 CIP1L
 
LPAR2 (mainframes 1, 2, 3):
DEVICE CIP1 CLAW 730 LPAR1 CIP1 NONE 20 20 4096 4096
LINK CIP1L IP 0 CIP1
HOME
 198.92.5.3 CIP1L
 
LPAR3 (mainframes 1, 2, 3):
DEVICE CIP1 CLAW 830 LPAR1 CIP1 NONE 20 20 4096 4096
LINK CIP1L IP 0 CIP1
HOME
 198.92.5.4 CIP1L

Router Configuration

On the router, the CIP is located in slot 3 and port 1 is connected to the ESCON director. The path commands define the group of paths that are used as the IP Host Backup.

interface channel 3/1
 ip address 198.92.5.1 255.255.255.128
 path c010 c110 c210
   claw 30 198.92.5.2 lpar1 cip1 tcpip tcpip
 path c020 c120 c220
   claw 30 198.92.5.3 lpar2 cip1 tcpip tcpip
 path c030 c130 c230
   claw 30 198.92.5.4 lpar3 cip1 tcpip tcpip

CMPC Configuration Examples for CMPC

This section provides sample configurations for the CMPC feature. Throughout these configuration samples, a Cisco 7500 router with an RSP is used to illustrate the configurations. The configurations also apply to a Cisco 7000 router with an RP or an RSP installed. All SAP values are written in hexadecimal form.

Refer to the following configuration examples to see how different networked systems can be configured:

Connecting VTAM to a Remote PC with Communications Server/2 Example

Figure 181 shows the physical components for this example. Figure 182 shows the various parameters for each component in the configuration example.

Figure 181: Topology for VTAM-to-Remote PC with Communications Server/2

In Figure 181, the following activity occurs:

VTAM connects to the CMPC driver on the CIP.
The CMPC driver converts the data to an LLC data stream and passes the data to the LLC2 stack on the CIP.
The LLC2 stack on the CIP passes the data to the bridging code on the RSP.
The bridging code on the RSP passes the data to the APPN network.

Figure 182: Parameters for VTAM-to-Remote PC with Communications Server/2

The example in Figure 182 shows CMPC running on the CIP and communicating with a PC running Communications Server/2. APPN is not running on the router. It is only running in VTAM and on the PC.

The configuration examples for the VTAM host and the router follow.

TRL Node LAGTRLA on MVS2

LAGTRA   VBUILD TYPE=TRL                                                
LAGTRLA  TRLE  LNCTL=MPC,MAXBFRU=8,REPLYTO=3.0,                        X
               READ=(2F0),                                             X
               WRITE=(2F1)

Local Node LAGLNA on MVS2

LAGNNA   VBUILD TYPE=LOCAL                                              
LAGPUA   PU    TRLE=LAGTRLA,                                           X
               ISTATUS=ACTIVE,                                         X
               XID=YES,CONNTYPE=APPN,CPCP=YES,HPR=YES

Configuration for Honduras Router

source-bridge ring-group 100
!
interface TokenRing0/0
 no ip address
 ring-speed 16
 source-bridge 500 4 100
!
interface Ethernet1/0
 ip address 172.18.3.24 255.255.255.0
!
interface Channel6/1
 no ip address
 no keepalive
 cmpc C020 F0 LAGUNAA READ
 cmpc C020 F1 LAGUNAA WRITE
!
interface Channel6/2
 no ip address
 no keepalive
 lan TokenRing 0
  source-bridge 88 3 100
  adapter 1 4000.aaaa.aaaa
 tg LAGUNAA  llc token-adapter 1  18 rmac 4000.0000.beef rsap 14

Activate the Configuration

To activate the configuration, issue the following commands from MVS2:

v net,act,id=lagtrla,update=add
v net,act,id=laglna

Connecting VTAM to the APPN NN on the CIP Example

Figure 183 shows the physical components for this example. Figure 184 shows the various parameters for each component in the configuration example.

Figure 183: Topology for VTAM-to-APPN NN Connection on the CIP

In Figure 184, the following activity occurs:

VTAM connects to the CMPC driver on the CIP.
The CMPC driver converts the data to an LLC data stream and passes the data to the LLC2 stack on the CIP.
The LLC2 stack on the CIP passes the data to the LLC2 stack on the RSP.
The LLC2 stack on the RSP passes the data to APPN on the RSP.
APPN on the RSP sends the data to the APPN network.

Figure 184: Parameters for VTAM-to-APPN NN Connection on the CIP

The configuration illustrated in Figure 184 is more complex because you must configure APPN on the router. There are many different ways to configure APPN. The example is a simple APPN configuration in which SRB is used to connect the APPN NN on the RSP to VTAM and the token-ring attached PC.

It is possible to connect directly to the Token Ring port, an option not shown in the example.

When configuring APPN on the router, you must type the complete command before exiting an APPN configuration subsection. If you need to change an APPN configuration subsection, you must type the no complete command before you can change the subsection. Remember to type complete before exiting the subsection. The router ignores the new APPN configuration commands until you type the complete command.

Configuration for TRL Node LAGTRLB

LAGTRB   VBUILD TYPE=TRL                                                
LAGTRLB  TRLE  LNCTL=MPC,MAXBFRU=8,REPLYTO=3.0,                        X
               READ=(2F2),                                             X
               WRITE=(2F3)

Local SNA Major Node LAGLNB

LAGNNB   VBUILD TYPE=LOCAL                                              
LAGPUB   PU    TRLE=LAGTRLB,                                           X
               ISTATUS=ACTIVE,                                         X
               XID=YES,CONNTYPE=APPN,CPCP=YES

Honduras Router

interface Channel6/1
 no ip address
 no keepalive
 cmpc C020 F2 LAGUNAB READ
 cmpc C020 F3 LAGUNAB WRITE
!
interface Channel6/2
 no ip address
 no keepalive
 lan TokenRing 0
  source-bridge 88 3 100
  adapter 2 4000.bbbb.bbbb
 lan TokenRing 2
 tg LAGUNAB  llc token-adapter 2  20 rmac 4000.0000.bbbb rsap 24
!
!
appn control-point NETA.HONDURAS
    complete
!
appn port RSRBPORT rsrb
  local-sap 24
  desired-max-send-btu-size 4096
  max-rcv-btu-size 4096
  rsrb-virtual-station 4000.0000.bbbb 61 2 100
  complete
!
appn link-station LAGUNAB
  port RSRBPORT
  lan-dest-address 4000.0000.beef 14
  complete
router eigrp 109
 network 172.18.0.0

Activate the Configuration

After all configurations are in place, the following commands can be used to start up the links. On the MVS system, use the following commands:

v net,act,id=lagtrlb,update=add
v net,act,id=laglnb

On the router, use the following command from the global configuration mode:

appn start

Connecting Two VTAM Nodes Using Two CIPs in the Same Router Example

Figure 185 shows the physical components for this example. Figure 186 shows the various parameters for each component in the configuration example.

Figure 185: Topology for VTAM-to-VTAM Connection

In Figure 185, the following activity occurs:

VTAM on Mainframe 1 passes MPC data to the CMPC driver on CIP 1.
The CMPC driver on CIP 1 passes the data to the LLC2 stack.
LLC2 sends the data to CIP 2 in the same router via IEEE 802.2.
The LLC2 stack on CIP 2 passes the data to the CMPC driver on CIP 2, which passes the data to VTAM on Mainframe 2.

The CIPs could be in different routers or both VTAM connections could be to the same CIP.

Figure 186 shows parameters for VTAM-to-VTAM connection.

Figure 186: Parameters for VTAM-to-VTAM Connection

Differing solutions can be configured for the example shown in Figure 186. For example, you can have two CIPs in different routers connected via LLC2. You can also configure host connections going into the same CIP card rather than two separate CIP cards.

mvs2trlc

MVS2TRC  VBUILD TYPE=TRL                                                
MVS2TRLC TRLE  LNCTL=MPC,MAXBFRU=8,REPLYTO=3.0,                        X
               READ=(2F4),                                             X
               WRITE=(2F5)

mvs2lnc

MVS2NNC  VBUILD TYPE=LOCAL                                              
MVS2PUC  PU    TRLE=MVS2TRLC,                                          X
               ISTATUS=ACTIVE,                                         X
               XID=YES,CONNTYPE=APPN,CPCP=YES

cpactrlc

CPACTRC  VBUILD TYPE=TRL                                                
CPACTRLC TRLE  LNCTL=MPC,MAXBFRU=8,REPLYTO=3.0,                        X
               READ=(840),                                             X
               WRITE=(841)

cpaclnc

CPACNNC  VBUILD TYPE=LOCAL                                              
CPACPUC  PU    TRLE=CPACTRLC,                                          X
               ISTATUS=ACTIVE,                                         X
               XID=YES,CONNTYPE=APPN,CPCP=YES

Router

interface Channel4/1
 no ip address
 no keepalive
 cmpc C010 40 CPACC READ
 cmpc C010 41 CPACC WRITE
!
interface Channel4/2
 no ip address
 no keepalive
 lan TokenRing 0
  source-bridge 43 5 100
  adapter 3 4000.0000.cccc
 tg CPACC    llc token-adapter 3  34 rmac 4000.cccc.cccc rsap 30
!
interface Channel6/1
 no ip address
 no keepalive
 cmpc C020 F4 MVS2C READ
 cmpc C020 F5 MVS2C WRITE
!
interface Channel6/2
  lan TokenRing 0
  source-bridge 88 3 100
    adapter 3 4000.cccc.cccc
 tg MVS2C    llc token-adapter 3  30 rmac 4000.0000.cccc rsap 34

Activate the Configuration

On the MVS system MVS2, use the following commands to activate the configuration:

v net,act,id=mvs2trlc,update=add
v net,act,id=mvs2lnc

On the MVS system CPAC, use the following commands to activate the configuration:

v net,act,id=cpactrlc,update=add
v net,act,id=cpaclnc

Connecting VTAM to the APPN NN on a Remote Router with DLUR Example

Figure 187 shows the physical components for the DLUS-to-DLUR configuration. Figure 188 shows the various parameters for each component in the configuration example.

Figure 187: Topology for VTAM-to-APPN NN on a Remote Router with DLUR Connection

Figure 188: Parameters for VTAM-to-APPN NN on a Remote Router with DLUR Connection

In the example shown in Figure 188, DLUS is running on the MVS host. DLUR is running on a remote Cisco 4000 router. The connection from MPC to the APPN stack on the Cisco 4000 is via LLC2. There is no NN on the Cisco 7500. The PC is running Communications Server/2.

mvs2trld

MVS2TRD  VBUILD TYPE=TRL                                                
MVS2TRLD TRLE  LNCTL=MPC,MAXBFRU=8,REPLYTO=3.0,                        X
               READ=(2F7),                                             X
               WRITE=(2F6)

mvs2lnd

MVS2NND  VBUILD TYPE=LOCAL                                              
MVS2PUD  PU    TRLE=MVS2TRLD,                                          X
               ISTATUS=ACTIVE,                                         X
               XID=YES,CONNTYPE=APPN,CPCP=YES

Additional Configuration for Router Honduras

interface Channel6/1
 cmpc C020 F6 CONFIGD WRITE
 cmpc C020 F7 CONFIGD READ
!
interface Channel6/2
 lan TokenRing 0
  source-bridge 88 3 100
  adapter 4 4000.dddd.dddd
  tg CONFIGD  llc token-adapter 4  40 rmac 4000.0000.dddd rsap 44

Router Dustin

source-bridge ring-group 84
interface Ethernet0
 ip address 172.18.3.36 255.255.255.0
 media-type 10BaseT
!
interface TokenRing0
 no ip address
 ring-speed 16
 source-bridge 500 2 84
!
appn control-point NETA.DUSTIN
  dlus NETA.MVS2
  dlur
  complete
!
appn port RSRBPORT rsrb
  local-sap 44
  desired-max-send-btu-size 4096
  max-rcv-btu-size 4096
  rsrb-virtual-station 4000.0000.dddd 94 5 84
  complete
!
appn link-station LAGUNAD
  port RSRBPORT
  lan-dest-address 4000.0000.beef 14
  complete
!
appn link-station MVS2D
  port RSRBPORT
  lan-dest-address 4000.dddd.dddd 40
  complete

Activate the Configuration

On the MVS2 system, use the following commands to activate the configuration:

v net,act,id=mvs2trld,update=add
v net,act,id=mvs2lnd

On the router Dustin, use the following command from the global configuration mode:

appn start

TN3270 Server DLUR Running on the Same CIP Example

Figure 189 shows the physical components for this example. Figure 190 shows the various parameters for each component in the configuration example.

Figure 189: Topology for VTAM-to-TN3270 Server DLUR Running on the Same CIP Connection

In Figure 189, the following activity occurs:

The TN3270 server on the CMCC adapter takes on the role of an APPN EN running DLUR.
The APPN NN in VTAM communicates with the CMPC driver over the channel.
The CMPC driver on the CMCC adapter passes the data to the LLC2 stack on the CIP via a fast-path loopback driver to the TN3270 server on the CIP.
The TN3270 server converts the 3270 data stream to a TN3270 data stream and forwards the packets to the IP TN3270 clients in the IP network.

The TN3270 server does not have to be in the same CMCC adapter as the CMPC driver.

Figure 190: Parameters for VTAM-to-TN3270 DLUR Running on the Same Connection

The following configurations apply to the example shown in Figure 190.

mvs2trle

 MVS2TRE  VBUILD TYPE=TRL
 MVS2TRLE TRLE  LNCTL=MPC,MAXBFRU=8,REPLYTO=3.0,
                READ=(2F8),
                WRITE=(2F9)

mvs2lne

MVS2NNE  VBUILD TYPE=LOCAL
MVS2PUE  PU    TRLE=MVS2TRLE,
               ISTATUS=ACTIVE,
               XID=YES,CONNTYPE=APPN,CPCP=YES

swlagtn

SWLAGTN  VBUILD TYPE=SWNET,MAXGRP=10,MAXNO=10,MAXDLUR=10
LAGTNPU PU     ADDR=01,                                                X
               MAXPATH=1,                                              X
               IDBLK=017,IDNUM=EFEED,                                  X
               PUTYPE=2,                                               X
               MAXDATA=4096,                                           X
               LUGROUP=TNGRP1,LUSEED=LAGLU##

tngrp1

 TNGRP1E  VBUILD TYPE=LUGROUP
 TNGRP1   LUGROUP
 DYNAMIC  LU    DLOGMOD=D4C32XX3,                                       X
                MODETAB=ISTINCLM,USSTAB=USSTCPIP,SSCPFM=USS3270
 @        LU    DLOGMOD=D4C32784,                                       X
                MODETAB=ISTINCLM,USSTAB=USSTCPIP,SSCPFM=USS3270

Additional Router Configuration for Router Honduras

interface Channel6/1
 cmpc C020 F8 CONFIGE READ
 cmpc C020 F9 CONFIGE WRITE
!
interface Channel6/2
 lan TokenRing 0
  source-bridge 88 3 100
  adapter 5 4000.eeee.eeee
  adapter 6 4000.0000.eeee
 tn3270-server
  dlur NETA.HOND327S NETA.MVS2
   lsap token-adapter 6  54
    link MVS2TN   rmac 4000.eeee.eeee rsap 50
   pu TNPU     017EFEED 172.18.1.218   
 tg CONFIGE  llc token-adapter 6 50 rmac 4000.eeee.eeee rsap 54

Activate the Configuration

On the MVS system, use the following commands to activate the configuration:

v net,act,id=mvstrle,update=add
v net,act,id=mvslne
v net,act,id=swhondpu
v net,act,id=swlagtn
v net,act,id=swhondcp
v net,act,id=tngrp1

On the router Honduras, use the following command from TN3270 configuration mode:

no shutdown

Command	Purpose
llc2 N1 bytes	Maximum size of an I-frame in bytes.
llc2 N2 retry-count	Maximum retry count.
llc2 Nw window-size-increase	Increase the window size for consecutive good I-frame received (zero is disabled).
llc2 ack-delay-time milliseconds	Maximum time for incoming I-frames to stay unacknowledged.
llc2 ack-max frame-count	Maximum number of I-frames received before an acknowledgment must be sent.
llc2 idle-time milliseconds	Frequency of polls during periods of idle traffic.
llc2 local-window frame-count	Maximum number of I-frames to send before waiting for an acknowledgment.
llc2 recv-window frame-count	Receive window.
llc2 t1-time milliseconds	Specify amount of time to wait for an acknowledgment to transmit I-frames.
llc2 busy-time milliseconds	Amount of time to wait while the other LLC2 station is in a busy state before attempting to poll the remote station.
llc2 tpf-time milliseconds	Amount of time to wait for a final response to a poll frame before resending the original poll frame.
llc2 trej-time milliseconds	Amount of time to wait for resending a rejected frame before sending the reject command.

CLAW Path Argument Breakdown	Values	Description
Path	01-FF	For a directly attached ESCON channel or any Parallel channel, this value is 01 unless the system administrator has configured another value. For a channel attached through an ESCON director switch, this value will be the path that, from the Cisco IOS software point of view, exits the switch and attaches to the host.
Channel logical address	0-F	For a Parallel channel, this value is 0. For a directly attached ESCON channel, the value may be non-zero. If the host is running in Logical Partition (LPAR) mode and the CHPID is defined as shared, this is the partition number associated with the devices configured in the IOCP. The default for this part of the path argument is 0. Otherwise, the channel logical address associated with the channel is defined in the IOCP.
Control unit logical address	0-F	For a Parallel channel, this value is 0. For a directly attached ESCON channel, the value may be non-zero. If this value is specified in the IOCP, match that value here. Otherwise, the control unit logical address is specified in the IOCP CNTLUNIT statement for the host channel in the CUADD parameter.

Command	Purpose
show controllers cbus	Display the cbus internal state for the Cisco 7000 with RSP7000 and Cisco 7500 series routers. Also included in the display is CIP-specific information such as the currently loaded microcode, currently loaded microcode application segments, and load metrics.
show controllers channel [slot/port]	Display CPA-specific information, including the currently loaded microcode.
show extended channel slot/port backup [ip-address]	Display information about CLAW and offload commands for each backup group.
show extended channel slot/port cmpc [path [device]]	Display information about each CMPC subchannel configured on the specified CMCC adapter interface.
show extended channel slot/port connection-map llc2	Display the number of active LLC2 connections for each SAP and the mapping of the internal MAC adapter and the SAP to the resource that activated the SAP.
show extended channel slot/port csna [admin \| oper \| stats] [path [device]]	Display information about the CSNA subchannels configured on the specified CMCC adapter interface.
show extended channel slot/port llc2 [admin \| oper \| stats] [lmac [lsap [rmac [rsap]]]]	Display information about the LLC2 sessions running on the CMCC adapter interfaces.
show extended channel slot/port max-llc2-sessions	Display information about the number of LLC2 sessions supported on the CMCC adapter.
show extended channel slot/port icmp-stack [ip-address]	Display information about the ICMP stack running on the CMCC adapter interfaces.
show extended channel slot/port ip-stack [ip-address]	Display information about the IP stack running on the CMCC adapter interfaces
show extended channel slot/port llc2 [admin \| oper \| stats] [lmac [lsap [rmac [rsap]]]]	Display information about the LCC2 sessions running on the CMCC adapter interfaces.
show extended channel slot/port packing names [path [device]]	Display CLAW packing names and their connection state.
show extended channel slot/port packing stats [path[device]]	Display CLAW packing statistics.
show extended channel slot/port statistics [path [device]] [connected]	Display information about CMCC adapter interfaces for diagnostic purposes.
show extended channel slot/port subchannel [connected]	Display information about the CMCC adapter interfaces
show extended channel slot/port tcp-connections [[loc-ip-addr [loc-port [rem-ip-addr [rem-port]] [detail \| summary]	Display information about the TCP sockets on a channel interface.
show extended channel slot/port tcp-stack [ip-address]	Display information about the TCP stack running on the CMCC adapter interfaces.
show extended channel slot/port tg [oper \| stats] [detailed] [tg-name]	Display configuration, operational, and statistics information for CMPC transmission groups configured on a specified CMCC adapter internal LAN interface.
show extended channel slot/port tn3270-server	Display current configuration parameters and the status of the PUs defined in each TN3270 server.
show extended channel slot/port tn3270-server client-ip-address ip-address [disconnected \| in-session \| pending]	Display information about all clients at a specific IP address.
show extended channel slot/port tn3270-server dlur	Display information about the SNA session switch.
show extended channel slot/port tn3270-server dlurlink name	Display information about the DLUIR components.
show extended channel slot/port tn3270-server nailed-ip ip-address	Display mappings between a nailed client IP address and nailed LUs.
show extended channel slot/port tn3270-server pu pu-name	Display the PU configuration parameters, statistics, and all the LUs currently attached to the PU.
show extended channel slot/port tn3270-server pu pu-name lu locaddr [history]	Display information about the TN3270 server LUs running on CMCC adapter interfaces.
show extended channel slot/port udp-listeners [ip-address]	Display information about the UDP listener sockets on the CMCC adapter interfaces.
show extended channel slot/port udp-stack [ip-address]	Display information about the UDP stack running on the CMCC adapter interfaces.
show interfaces channel slot/port accounting	Display the number of packets for each protocol type that has been sent through the channel interface.
show version	Display the hardware configuration, software version, names and sources of configuration files, and boot images.

String from Client (ASCII)	BIND-IMAGE Requested?	String to Host (EBCDIC)
IBM-3278-4	No	327804
IBM-3279-5E	No	327905E
IBM-3279-3-E	Yes	3279S5E
IBM-DYNAMIC	Yes	DYNASIC
ABC	Yes	ABCS
ABCDEFGH	Yes	ABCDSFG

Command	PU Name	Idblk	IP-address	Type	Adapter number	Lsap	RMAC	RMAC	Lu-seed	Lu-name
PU	X1	05D30001	192.195.80.40	tok	1	4	RMAC	4100.cafe.0001	lu-seed	TN3X1###
PU	X2	05D30002	171.69.176.43	tok	1	8	RMAC	4100.cafe.0002	lu-seed	TN3X2###

Example VTAM host values defining LUSEED and LUGROUP name parameters:
TN3270PU	PU	. IDBLK=05D, IDNUM=30001,	*	define other PU parameters
		LUSEED=TN3X1###,	*	define the seed component of the LU names created by DDDLU (e.g. LOCADDR 42 will have the name TN3X1042)
		LUGROUP=AGROUP	*	define the LU group name
*
TN3X1100	LU	LOCADDR=100, MODETAB=AMODETAB	*	define a terminal which requires a specific LU name
*
TN3X1101	LU	LOCADDR=101, DLOGMODE=M3287CS	*	define a printer which requires a specific LU name

Example VTAM host values defining LUGROUPname, AGROUP:
AGROUP	LUGROUP		*	define LU group to support various terminal types
327802E	LU	USSTAB=USSXXX, LOGAPPL=TPXP001, DLOGMOD=SNX32702, SSCPFM=USS3270	*	define template to support IBM 3278 terminal model 2 with Extended Data Stream. Note that the USS messages in USSXXX should be in 3270 datastream.
3278S2E	LU	USSTAB=USSYYY, LOGAPPL=TPXP001, DLOGMOD=SNX32702, SSCPFM=USSSCS	*	define template to support IBM 3278 terminal model 2 with Extended Data Stream, for TN3270E clients requesting BIND-IMAGE.
327805	LU	USSTAB=USSXXX, LOGAPPL=TPXP001, DLOGMOD=D4C32785, SSCPFM=USS3270	*	define template to support IBM 3279 terminal model 5
@	LU	USSTAB=USSXXX, LOGAPPL=TPXP001, DLOGMOD=D4A32772, SSCPFM=USS3270		this is the default template to match any other terminal types

Command	Purpose
pu pu-name idblk-idnum ip-address type adapno lsap [rmac rmac] [rsap rsap] [lu-seed lu-name-stem]	Enter PU configuration mode and create or delete PUs with direct host links.
tcp-port port-nbr	(Optional) Assign a TCP port other than the default of 23. This command is also available in TN3270 configuration mode.
idle-time num-of-seconds	(Optional) Specify the idle time for server disconnect. This command is also available in TN3270 configuration mode.
keepalive num-of-seconds	Note (Optional) Specify the maximum time allowed between keepalive marks before the server disconnects. This command is also available in TN3270 configuration mode. Note: To enable sending of power-off Reply product set identification (PSID) network management vector transport (NMVT) to the host, the value should be set to 50000 more than the desired value. If the configured value is greater than 50000, the value used for the keepalive function will be 50000 less than the configured value.
unbind-action {keep \| disconnect}	(Optional) Specify whether the TN3270 session will disconnect when an UNBIND command is received. This command is also available in TN3270 configuration mode.
generic-pool {permit \| deny}	(Optional) Select whether "left-over" LUs can be used from a generic LU pool. This command is also available in TN3270 configuration mode.
ip precedence {screen \| printer} value	(Optional) Specify the precedence level for IP traffic in the TN3270 server.
ip tos {screen \| printer} value	(Optional) Specify the TOS level for IP traffic in the TN3270 server.

Command	Purpose
show extended channel slot/port tn3270-server	Display the current server configuration parameters and the status of the PUs defined in each server.
show extended channel slot/port tn3270-server client-ip-address ip-address [disconnected \| in-session \| pending]	Display information about all clients at a specific IP address.
show extended channel slot/port tn3270-server pu-name	Display the PU configuration parameters, statistics and all the LUs currently attached to the PU.
show extended channel slot/port tn3270-server pu pu-name lu locaddr [history]	Display information about the TN3270 server LUs running on a CMCC adapter interface.
show extended channel slot/port tn3270-server nailed-ip ip-address	Display mappings between a nailed client IP address and nailed LUs
show extended channel tn3270-server pu-name lu lu-number [history]	Display the status of the LU.
show extended channel tn3270-server client-ip-address ip-address	Display the information about LUs that are defined under an IP address.
show extended channel slot/port tn3270-server dlur	Display information about the SNA session switch.
show extended channel slot/port tn3270-server dlurlink name	Display information about the DLUR components.

Command	Purpose
llc2 N1 bytes	Maximum size of an I-frame in bytes.
llc2 N2 retry-count	Maximum retry count.
llc2 Nw window-size-increase	Increase the window size for consecutive good I-frame received (zero is disabled).
llc2 ack-delay-time milliseconds	Maximum time for incoming I-frames to stay unacknowledged.
llc2 ack-max frame-count	Maximum number of I-frames received before an acknowledgment must be sent.
llc2 idle-time milliseconds	Frequency of polls during periods of idle traffic.
llc2 local-window frame-count	Maximum number of I-frames to send before waiting for an acknowledgment.
llc2 recv-window frame-count	Receive window.
llc2 t1-time milliseconds	Specify amount of time to wait for an acknowledgment to transmit I-frames.
llc2 busy-time milliseconds	Amount of time to wait while the other LLC2 station is in a busy state before attempting to poll the remote station.
llc2 tpf-time milliseconds	Amount of time to wait for a final response to a poll frame before resending the original poll frame.
llc2 trej-time milliseconds	Amount of time to wait for resending a rejected frame before sending the reject command.

Table of Contents

Configuring Cisco Mainframe Channel Connection Adapters

Host Profile Statements

Router Configuration Statements

Host TCP/IP Profiles

Router Configuration

TRL Node LAGTRLA on MVS2

Local Node LAGLNA on MVS2

Configuration for Honduras Router

Activate the Configuration

Configuration for TRL Node LAGTRLB

Local SNA Major Node LAGLNB

Honduras Router

Activate the Configuration

mvs2trlc

mvs2lnc

cpactrlc

cpaclnc

Router

Activate the Configuration

mvs2trld

mvs2lnd

Additional Configuration for Router Honduras

Router Dustin

Activate the Configuration

mvs2trle

mvs2lne

swlagtn

tngrp1