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Release Notes for Cisco  3600 Series for Cisco  IOS Release  12.0(2)XD

Release Notes for Cisco  3600 Series for Cisco  IOS Release  12.0(2)XD

December 7, 1998

These release notes describe new features for the Cisco  3600 series routers that support Cisco  IOS Release  12.0(2)XD. Cisco  IOS Release  12.0(2)XD is based on Cisco  IOS Release  12.0(2)T.

Use these release notes in conjunction with the cross-platform Release Notes for Cisco IOS Release  12.0  T located on Cisco Connection Online (CCO)  and the Documentation CD-ROM.  

For a list of software caveats that apply to Release 12.0(2)XD, refer to the "Caveats" section.

Contents

These release notes discuss the following topics:

Introduction

Cisco  3600 series includes the Cisco  3620 and Cisco  3640 routers. As modular solutions, the Cisco  3620 and Cisco  3640 enable corporations to increase dial-up intensity and take advantage of current and emerging WAN technologies and networking capabilities. The Cisco  3600 series routers are fully supported by Cisco  IOS software, which includes dial-up connectivity, LAN-to-LAN routing, data and access security, WAN optimization, and multimedia features.

System Requirements

This section describes the system requirements for Release  12.0(2)XD and includes the following sections:

Memory Requirements

Table 1 describes the memory requirements of the Cisco IOS feature sets for the Cisco  3600 series routers for Release  12.0(2)XD.


Table 1: Memory Requirements for the Cisco  3600 Series
Feature Set by Platform Image Name Required Flash Memory Required DRAM Memory Runs from
Cisco 3620

IP Plus

c3620-is-mz

8 MB Flash

32 MB DRAM

RAM

IP Plus 40

c3620-is40-mz

8 MB Flash

32 MB DRAM

RAM

IP Plus IPSec 56

c3620-is56i-mz

8 MB Flash

32 MB DRAM

RAM

IP/FW Plus IPSec 56

c3620-ios56i-mz

8 MB Flash

32 MB DRAM

RAM

IP/IPX/AT/DEC Plus

c3620-ds-mz

8 MB Flash

32 MB DRAM

RAM

IP/IPX/AT/DEC/ FW Plus

c3620-dos-mz

8 MB Flash

32 MB DRAM

RAM

Enterprise Plus

c3620-js-mz

8 MB Flash

32 MB DRAM

RAM

Enterprise Plus 40

c3620-js40-mz

8 MB Flash

48 MB DRAM

RAM

Enterprise Plus IPSec 56

c3620-js56i-mz

8 MB Flash

48 MB DRAM

RAM

Enterprise/FW IPSec 56

c3620-jos56i-mz

8 MB Flash

32 MB DRAM

RAM

Enterprise/APPN Plus

c3620-ajs-mz

8 MB Flash

48 MB DRAM

RAM

Enterprise/APPN Plus 40

c3620-ajs40-mz

8 MB Flash

48 MB DRAM

RAM

Enterprise/APPN Plus IPSec 56

c3620-ajs56i-mz

8 MB Flash

48 MB DRAM

RAM

Cisco 3640

IP Plus

c3640-is-mz

8 MB Flash

32 MB DRAM

RAM

IP Plus 40

c3640-is40-mz

8 MB Flash

32 MB DRAM

RAM

IP Plus IPSec 56

c3640-is56i-mz

8 MB Flash

32 MB DRAM

RAM

IP/FW Plus IPSec 56

c3640-ios56i-mz

8 MB Flash

32 MB DRAM

RAM

IP/IPX/AT/DEC Plus

c3640-ds-mz

8 MB Flash

32 MB DRAM

RAM

IP/IPX/AT/DEC/FW Plus

c3640-dos-mz

8 MB Flash

32 MB DRAM

RAM

Enterprise Plus

c3640-js-mz

8 MB Flash

48 MB DRAM

RAM

Enterprise Plus 40

c3640-js40-mz

8 MB Flash

48 MB DRAM

RAM

Enterprise Plus IPSec 56

c3640-js56i-mz

8 MB Flash

48 MB DRAM

RAM

Enterprise/FW IPSec 56

c3640-jos56i-mz

8 MB Flash

32 MB DRAM

RAM

Enterprise/APPN Plus

c3640-ajs-mz

16 MB Flash

48 MB DRAM

RAM

Enterprise/APPN Plus 40

c3640-ajs40-mz

16 MB Flash

48 MB DRAM

RAM

Enterprise/APPN Plus IPSec 56

c3640-ajs56i-mz

16 MB Flash

48 MB DRAM

RAM

Hardware Supported

Cisco IOS Release  12.0(2)XD supports the Cisco  3600 series routers:


Table 2: Supported Interfaces on the Cisco  3600 Series
Interface, Network Module, or Data Rate Platforms Supported
Dial Access Network Modules

16- and 32-port Asynchronous network module

All Cisco 3600 series platforms

6- to 30-port Integrated Digital Modems network module

All Cisco 3600 series platforms

8- or 16-port Integrated Analog network module

All Cisco 3600 series platforms

LAN Interfaces

1- and 4-port Ethernet (AUI and 10BaseT)

All Cisco 3600 series platforms

4/16 Mbps Token Ring

All Cisco 3600 series platforms

Fast Ethernet (100BaseTX and 100BaseFX)

All Cisco 3600 series platforms

Mixed Media Network Modules

Single port 10/100BaseTX with 1-port Channelized/PRI E1 balanced mode

All Cisco 3600 series platforms

Single port 10/100BaseTX with 1-port Channelized/PRI E1 unbalanced mode

All Cisco 3600 series platforms

Single port 10/100BaseTX with 1-port Channelized/PRI T1

All Cisco 3600 series platforms

Single port 10/100BaseTX with 1-port Channelized/PRI T1 with CSU

All Cisco 3600 series platforms

Single port 10/100BaseTX with 2-port Channelized/PRI E1 balanced mode

All Cisco 3600 series platforms

Single port 10/100BaseTX with 2-port Channelized/PRI E1 unbalanced mode

All Cisco 3600 series platforms

Single port 10/100BaseTX with 2-port Channelized/PRI T1

All Cisco 3600 series platforms

Single port 10/100BaseTX with 2-port Channelized/PRI T1 with CSU

All Cisco 3600 series platforms

1 Ethernet and 2 WAN Card Slot

All Cisco 3600 series platforms

1 Ethernet, 1 Token Ring, and 2 WAN Card Slot

All Cisco 3600 series platforms

2 Ethernet and 2 WAN Card Slot

All Cisco 3600 series platforms

Voice/Fax Interfaces and Network Modules1

2-port ISDN BRI S/T TE Voice interface card

All Cisco  3600 series platforms

1- and 2-port Voice/Fax network module

All Cisco 3600 series platforms with Voice/Fax network module

2-port E&M Voice interface card

All Cisco 3600 series platforms

2-port FXO Voice interface card

All Cisco 3600 series platforms with Voice/Fax network module

2-port FXS Voice interface card

All Cisco 3600 series platforms with Voice/Fax network module

WAN Data Rates

48/56/64 kbps

All Cisco 3600 series platforms

1.544/2.048 Mbps

All Cisco 3600 series platforms

Up to 8 Mbps on 4-port Serial network module

All Cisco 3600 series platforms

52 Mbps max using High Speed Serial Interface (HSSI) network module

All Cisco 3600 series platforms

WAN Interfaces and Network Modules2

1- and 2-port Channelized T1 and E1 network module

All Cisco 3600 series platforms

1-port ATM-25 network modules for the Cisco 3600 series

All Cisco 3600 series platforms

1-port BRI with NT or S/T WAN interface card

All Cisco 3600 series platforms

1-Port High Speed Serial Interface network module (HSSI)

All Cisco 3600 series platforms

4- and 8-port BRI network module with NT1

All Cisco 3600 series platforms

4- and 8-port BRI network module with S/T interface

All Cisco 3600 series platforms

4- and 8-port Synchrounous/Asynchronous

All Cisco 3600 series platforms

4-port Serial

All Cisco 3600 series platforms

56/64 kbps DSU/CSU

All Cisco 3600 series platforms

T1 WAN interface card for Cisco 3600, Cisco 2600, and Cisco 1600 series

All Cisco 3600 series platforms

T1 with Integrated DSU/CSU for the Cisco  3600, Cisco 2600, and Cisco 1600 series

All Cisco 3600 series platforms

1The Voice/Fax network modules require Cisco IOS Plus feature sets.
2The ATM-25 network modules require Cisco IOS Plus feature sets.

Determining Your Cisco  IOS Software Release

To determine the version of Cisco IOS software currently running on a Cisco  3600 series router, log into the router and use the show version EXEC command. The following is sample output from the show version command. The version number is indicated on the second line as shown below:

Cisco Internetwork Operating System Software
IOS (tm) 3620 Software (C3620-JS-MZ), Version 12.0(2)XD, RELEASE SOFTWARE

Additional command output lines include more information, such as processor revision numbers, memory amounts, hardware IDs, and partition information.

Upgrading to a New Release

For generic information on upgrading to a new software release, refer to the Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin located on CCO. On CCO, follow this path:

Products & Ordering: More Information: Product Bulletins. Scroll to Software. Under Cisco  IOS 11.3, click the Upgrade Paths bulletin.

The Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin does not contain information specific to Cisco IOS Release 12.0(2)XD, but provides generic upgrade information that might apply to Cisco IOS Release 12.0(2)XD.

Feature Set Tables

To determine what features are available with each feature set, see Table 3 and Table 4. The tables summarize what features you can use when running a specific feature set on a Cisco 3600 series router for Cisco IOS Release  12.0(2)XD.

Both tables use the following conventions to identify features:

Note This feature set table contains only a selected list of features. This table is not a cumulative or complete list of all the features in each image.


Table 3: Feature Lists by Feature Sets for the Cisco 3600 Series, Part 1 of 2
Feature Set
Features IP Plus IP Plus 40 IP Plus IPSec 56 IP/FW Plus IPSec 56 IP/IPX/
AT/DEC Plus 		IP/IPX/
AT/DEC/FW Plus
Connectivity
Layer 2 Tunnel Protocol (L2TP)

Yes

Yes

Yes

Yes

Yes

Yes

RIP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

IP Routing

Easy IP Phase 2-DHCP Server

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Packet Pacing

Yes

Yes

Yes

Yes

Yes

Yes

Management

ISDN MIB RFC 2127

Yes

Yes

Yes

Yes

Yes

Yes

Smart-init (Mars FE2P)

Yes

Yes

Yes

Yes

Yes

Yes

Quality of Service
CLI String Search

Yes

Yes

Yes

Yes

Yes

Yes

Security

Cisco IOS Firewall Feature Set Platform Support

No

No

No

Yes

No

Yes

Switching

Cisco IOS STP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Voice/Multimedia
Voice over IP

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services

Cisco IOS IEEE 802.1Q

Yes

Yes

Yes

Yes

Yes

Yes

Mobile IP

Yes

Yes

Yes

Yes

Yes

Yes

PPP Over Frame Relay

Yes

Yes

Yes

Yes

Yes

Yes

Time-Based Access Lists

Yes

Yes

Yes

Yes

Yes

Yes


Table 4: Feature Lists by Feature Sets for the Cisco 3600 Series, Part 2 of 2
Feature Set
Features Enter-
prise Plus 		Enter
-prise Plus 40 		Enter
-prise Plus IPSec 56 		Enter
-prise/
FW IPSec 56 		Enter
-prise/
APPN Plus 		Enter
-prise/
APPN Plus 40 		Enter-
prise/
APPN Plus IPSec
56
Connectivity
Layer 2 Tunnel Protocol (L2TP)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

RIP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

IP Routing
Easy IP Phase 2-DHCP Server

Yes

Yes

Yes

Yes

Yes

Yes

Yes

OSPF Packet Pacing

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Management
ISDN MIB RFC 2127

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Smart-init (Mars FE2P)

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Quality of Service
CLI String Search

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Security
Cisco IOS Firewall Feature Set Platform Support

No

No

No

Yes

No

No

No

Switching
Cisco IOS STP Enhancements

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Voice/Multimedia
Voice over IP

Yes

Yes

Yes

Yes

Yes

Yes

Yes

WAN Services
Cisco IOS IEEE 802.1Q

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Mobile IP

Yes

Yes

Yes

Yes

Yes

Yes

Yes

PPP Over Frame Relay

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Time-Based Access Lists

Yes

Yes

Yes

Yes

Yes

Yes

Yes

New and Changed Information

This section lists new features introduced for the Cisco 3600 in Cisco IOS Release 12.0(2)XD and Cisco IOS Release 12.0(1)T. For more information about these features, refer to the cross-platform Release Notes for Cisco IOS Release 12.0 T   located on Cisco Connection Online (CCO) and the Documentation CD-ROM, and the "Cisco IOS Software Document Set" section.

New Features in Release 12.0(2)XD

The following new features are supported by the Cisco 3600 in Cisco IOS Release 12.0(2)XD.

ISDN BRI VIC

The ISDN BRI VIC (Voice Interface Card) provides narrowband digital voice connectivity in Cisco's VoIP (and soon, VoFR) environments. It provides a client-side (TE) ISDN S/T physical interface for connection to an NT1 terminating an ISDN telephone network. Each of its two ports can carry two voice calls (one over each ISDN B channel) for a total of four calls per ISDN BRI card.

It is another VIC which supplements the current array of VICs, but is the first digital VIC available.

New Features in Release 12.0(1)T

Cisco IOS IEEE 802.1Q Support

Cisco IOS IEEE 802.1Q provides support for IEEE 802.1Q encapsulation for Virtual LANs (VLANs). Use this feature for VLANs consisting of IEEE 802.1Q compliant switches.

Mobile IP

Mobile IP provides users the freedom to roam beyond their home subnet while consistently maintaining their home IP address. This enables transparent routing of IP datagrams to mobile users during their movement, so that data sessions can be initiated to them while they roam; it also enables sessions to be maintained in spite of physical movement between points of attachment to the Internet or other networks. Cisco's implementation of Mobile IP is fully compliant with the Internet Engineering Task Force's (IETF's) proposed standard defined in Request for Comments (RFC)    2002.

Easy IP Phase 2-DHCP Server

With the introduction of Easy IP Phase 2, Cisco IOS software supports Intelligent DHCP Relay functionality. A DHCP Relay Agent is any host that forwards DHCP packets between clients and servers. A DHCP Relay Agent enables the client and server to reside on separate subnets. If the Cisco IOS DHCP server cannot satisfy a DHCP request from its own database, it can forward the DHCP request to one or more secondary DHCP servers defined by the network administrator using standard Cisco IOS IP helper-address functionality.

Smart-init (Mars FE2P)

The smart-init feature is an extension to the existing memory split program of the Cisco IOS software running on Cisco 3600 series routers. It computes iomem size by looking at the network modules installed in the system and uses this iomem for carrying out the memory split. Also, compatibility with older Cisco IOS configurations is maintained by retaining support for the memory-size configuration command. The user can disable smart-init and set iomem percentage to the required value by entering the memory-size configuration command.

OSPF Packet Pacing

The former OSPF implementation for sending update packets needed to be more efficient. Some update packets were getting lost in cases when a link was slow, a neighbor could not receive the updates fast enough, or the router was out of buffer space. For example, packets might be dropped if either of these topologies existed:

OSPF update packets are now automatically paced by a delay of 33 milliseconds. Pacing is also added between retransmissions to increase efficiency and minimize lost retransmissions.

OSPF update and retransmission packets are sent more efficiently. Also, you can display the LSAs waiting to be sent out an interface.

Time-Based Access Lists

It is now possible to implement access lists based on the time of day. To do so, you create a time range that defines specific times of the day and week. The time range is identified by a name, and then referenced by a function, so that those time restrictions are imposed on the function itself.

Currently, IP and IPX extended access lists are the only functions that can use time ranges. The time range allows the network administrator to define when the permit or deny statements in the access list are in effect. Prior to this feature, access list statements were always in effect once they were applied. Both named or numbered access lists can reference a time range.

RIP Enhancements

Triggered extensions to IP RIP increase efficiency of RIP on point-to-point, serial interfaces.

Routers are used on connection-oriented networks to allow potential connectivity to many remote destinations. Circuits on the WAN are established on demand and are relinquished when the traffic subsides. Depending on the application, the connection between any two sites for user data could be short and relatively infrequent.

Previously, there were two problems using RIP to connect to a WAN:

To overcome these limitations, triggered extensions to RIP cause RIP to send information on the WAN only when there has been an update to the routing database. Periodic update packets are suppressed over the interface on which this feature is enabled.

Cisco IOS Firewall Feature Set Platform Support

The Cisco IOS Firewall feature set is now available on Cisco 2600 and Cisco 3600 series products.

The Cisco IOS Firewall feature set extends the security technology currently available in Cisco IOS software to provide firewall specific capabilities:

The Cisco IOS Firewall feature set adds advanced filtering capabilities to existing security functionality in Cisco routers. Some existing Cisco IOS security features include packet filtering via access control lists (ACLs), Network Address Translation (NAT), network-layer encryption, and TACACS+ authentication.

ISDN MIB RFC2127

The new Integrated Services Digital Network (ISDN) Management Information Base (MIB) RFC2127 has been designed to provide useful information in accordance with the IETF's new standard for the management of ISDN interfaces. RFC2127 provides information on the physical Basic Rate interfaces, control and statistical information for B (bearer) and D (signaling) channels, terminal endpoints, and directory numbers.

The ISDN MIB RFC2127 controls all aspects of ISDN interfaces. It consists of five groups:

The ISDN MIB RFC2127 enables you to use any commercial SNMP network management application to support ISDN call processing in Cisco IOS software. You can integrate management of dial access products using ISDN with your existing network management systems.

Layer Two Tunneling Protocol (L2TP)

Layer Two Tunneling Protocol (L2TP) is an emerging Internet Engineering Task Force (IETF) standard that combines the best features of two existing tunneling protocols: Cisco's Layer Two Forwarding (L2F) and Microsoft's Point-to-Point Tunneling Protocol (PPTP). L2TP is an extension to the Point-to-Point Protocol (PPP), which is an important component for Access Virtual Private Networks (VPNs). Access VPNs allow mobile users to connect to their corporate intranets or extranets, thus improving flexibility and reducing costs.

Previously, traditional dial-up networking services only supported registered IP address, which limited the types of applications that could be implemented over Virtual Private Networks (VPNs). L2TP supports multiple protocols and unregistered and privately administered IP addresses over the Internet. This allows the existing access infastructure, such as the Internet, modems, access servers, and ISDN terminal adaptors (TAs), to be used.

L2TP can be initiated wherever PPTP or L2F is currently deployed and can be operated as a client initiated tunnel, such as PPTP, or a network access server (NAS) initiated tunnel, such as L2F.

PPP Over Frame Relay

The PPP over Frame Relay feature allows a router to establish end-to-end Point-to-Point Protocol (PPP) sessions over Frame Relay. IP datagrams are transported over the PPP link using RFC 1973 compliant Frame Relay framing. This feature is useful for remote users running PPP to access their Frame Relay corporate networks.

PPP over Frame Relay provides the following benefits:

CLI String Search

The Command Line Interface (CLI) String Search feature allows you to search or filter any show or more command's output. This is useful when you need to sort though large amounts of output, or if you want to exclude output that you do not need to see. CLI String Search also allows for searching and filtering at paging prompts.

With the search function, you can begin unfiltered output at the first line that contains a regular expression you specify. You can specify a maximum of one filter per command to either include or exclude output lines that contain the specified regular expression.

A regular expression is any word, phrase, number, and so forth that appears in show or more command output.

Cisco IOS STP Enhancements

Cisco IOS Spanning Tree Protocol enhancements broaden the original Cisco IOS STP implementation with increased port identification capability, improved path cost determination, and support for a new VLAN bridge spanning-tree protocol.

Important Notes

This section contains important information about use of your Cisco IOS Release 12.0(2)XD software.

Deprecated MIBs

Older Cisco Management Information Bases (MIBs) will be replaced in a future release. OLD-CISCO-* MIBS are currently being migrated into more scalable MIBs, without affecting existing Cisco IOS products or NMS applications. Application developers should update from deprecated MIBs to the replacement MIBs as shown in the table below.


Table 5: Deprecated MIBs
Deprecated MIB Replacement

OLD-CISCO-APPLETALK-MIB

RFC1243-MIB

OLD-CISCO-CHASSIS-MIB

ENTITY-MIB

OLD-CISCO-CPUK-MIB

In Development

OLD-CISCO-DECNET-MIB

OLD-CISCO-ENV-MIB

CISCO-ENVMON-MIB

OLD-CISCO-FLASH-MIB

CISCO-FLASH-MIB

OLD-CISCO-INTERFACES-MIB

IF-MIB CISCO-QUEUE-MIB

OLD-CISCO-IP-MIB

OLD-CISCO-MEMORY-MIB

CISCO-MEMORY-POOL-MIB

OLD-CISCO-NOVELL-MIB

NOVELL-IPX-MIB

OLD-CISCO-SYS-MIB

(Compilation of other OLD* MIBS)

OLD-CISCO-SYSTEM-MIB

CISCO-CONFIG-COPY-MIB

OLD-CISCO-TCP-MIB

CISCO-TCP-MIB

OLD-CISCO-TS-MIB

OLD-CISCO-VINES-MIB

CISCO-VINES-MIB

OLD-CISCO-XNS-MIB

Caveats

This section contains the open caveats for the current Cisco IOS maintenance release only. The software caveats are also located in the Caveats for Cisco IOS Release 12.0 T document that accompanies these release notes.The caveats document is located on CCO and the Documentation CD-ROM.

Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. Bug Navigator II is at http://www.cisco.com/support/bugtools, or from CCO, select Software & Support: Technical Tools: Bug Toolkit II

Open Caveats - Release 12.0(2)XD

This section describes possibly unexpected behavior by Release 12.0(2)XD. Unless otherwise noted, these caveats apply to all 12.0 releases up to and including 12.0(2)XD.

Basic System Services

Configuring the layer3 switching with access filter in and out on the hssi interface with the Frame relay ietf encap, then try to configure the smds encap will cause the router to crash.
When configuring a mc3810 for CCS cross-connect, it's possible that calls will stop getting connected after a period of time.

DECnet

This problem is specific to the RSM platform and for DECnet over VLANs.
The code for DECnet support over VLANs uses a cache to store VLAN-header information, and this cache is used in the fast-switch path.
When there is a routing topology change, the fast-switching code continues to look at the stale cache entry, and as a result, packets destined via the new route end up getting black-holed.
The work-around is to disable DECnet fast-switching on the relevant interface.

IBM Connectivity

Router running DLSw with FST/Direct/LLC2(Lite) encapsulations could crash.
Workaround for this is to use DLSw with TCP encapsulation.

Interfaces and Bridging

FDDI PA will now have a software address filter at VIP level to filter out unwanted multicast packets. This helps performance and also unnecessary entries in netflow tables.
If "no keepalive" (or 0 keepalive) is configured on fastethernet, the line will stay up even though the MII is removed or the cable is disconnected. If the interface is then reconfigured with "keepalive" (of non-zero value) while the physical media stayed down, the link would still indicate up. The only workaround is by doing a shut/no shut, or clear interface command.
A large packet sent over a MLP bundle of over 2 links with VPDN on a ATM PPP tunnel on a ATM-Lite interface will be corrupted sometimes. A workaround is to disable the fastswitching on the ATM-lite interface.

IP Routing Protocols

If ospf has both an external and a summary route to the same network and a partial spf run deletes the summary route, the external route will not be installed.
The external LSA may have the routing bit set, even if it is not installed in the routing table. This is caused by a failure to reset the external's routing bit when the summary route replaces the external route in the ip routing table. The following sequence of events illustrates the problem, given external and summary routes to network 1.0.0.0:
1. ospf installs external route to 1.0.0.0. The external LSA for 1.0.0.0 has its routing bit set 2. ospf installs summary route to 1.0.0.0, replacing the external route. The routing bit is not reset on the external LSA for 1.0.0.0. 3. ospf performs a partial spf to remove the summary route to 1.0.0.0. The external route to 1.0.0.0 is not installed. To add to the confusion, the routing bit is still set on the external LSA for 1.0.0.0.
A'clear ip route *' will force the installation of the external route. Alternatively, a'clear ip ospf redist' at the router that originates the external route will trigger installation of the external route.
Guaranteed service flowspec in RSVP RESV messages must contain certain fields within a certain range (as indicated by RFC 2212). This fix puts these checks in the code
With sync and certain topologies, some bgp routes may not get advertised after peer reset.
The workaround is to configure "no sync", or "clear ip bgp x.x.x.x".

ISO CLNS

On all platforms which do not use the old mci controller, fast-switching of clns traffic with non-zero N-Selector does not work.

Miscellaneous

When running 2523 and 2524 serial ports in asynchronous mode, modem control is only supported when using DTE style 5-in-1 cables (in order to connect to DCE devices). The DCE 5-in-1 cable (in order to connect to DTE devices) will not support modem control for the asynchronous mode. In order to support DTE devices with modem control, it is required to use the DTE style cables with a null modem adapter.
When you configure Bisync (encapsulation bstun) with the ASCII character set (bsc char-set ascii) on the first port of a serial WIC (1T, 2T, or 2A/S) in WIC slot 0 of a Cisco 2600 series router, only the first character of each frame is received, and the BSTUN tunnel is not established. This only affects Bisync mode when it is configured with the ASCII character set. Other encapsulations are not affected, and using the EBCDIC character set with Bisync works correctly.
For the first serial port in WIC slot 0, the parity detection is not configured correctly for Bisync in ASCII mode. The first character of each frame generates a parity error that causes the receiver to discard the frame after the first character received.
Workaround: Use a different serial port: either the second serial port (port 1) on a 2T or 2A/S WIC in WIC slot 0 or any serial port in WIC slot 1. If you have only one serial WIC, moving it from WIC slot 0 to WIC slot 1 fixes this problem.
When running Tag Switching and CEF on an Ethernet interface, it is possible for the interface to get into a state where the IP packets are not forwarded properly.
The problem occurs when a CEF entry is improperly pointing at a Tag data structure. To check whether this is the problem, do
show adjacency detail
for the next hop on the failing route. In the failure case, the packet counts on the "IP" adjacency will not be increasing, but those on the "TAG" one will.
Workaround: disable Tag switching on the interface
When enrolling certificate with Entrust VPN, you might fail to get CA certificates. So far, this problem only happened on the Cisco 2500 platform and there is no work around. Please upgrade to the next build.
In Release 11.2P and 11.3 when Fast Ethernet subinterfaces are configured for encryption, if the crypto map is only applied to the main interface and the IP address is configured in the subinterface, the packets could be switched in the clear. In Release 12.0, enabling CEF could cause the packets to get dropped.
When you run TRISL to a Cisco 7000 family router, some frames larger than 1535 bytes might not be forwarded. This condition occurs when you run TRISL between two VLANs that are on switches.
Workaround: Do not use TRISL. Use an external device to router or bridge between the two different VLANs. Or modify the end devices so that they do not send packets larger than 1500 bytes.
From enclosure: Release-note
A Cisco 1600 router or Cisco 3600 series router will reload when IPSEC is configured over the ISDN link. This condition is caused by the IP route-cache that is enabled by default on all interfaces.
The workaround is to turn off fast switching with the no ip route-cache command on the ISDN interfaces.
From enclosure: Release-note-2
This crash has also been seen on the 3600 platform.
If a UDP packet with an invalid length is sent to port 514 (the "syslog" port) on an IOS device, the device is likely to crash, possibly without saving a stack trace. Such packets are sent by the popular "nmap" port scanning program.

Wide-Area Networking

StatusMsg with endpointRef is not processed in multipoint state table. This could result in releasing multipoint vc.

Resolved Caveats - Release 12.0 T

All the caveats listed in this section are resolved in release 12.0(2)T.

IP Routing Protocols

workaround:
The workaround is to configure "router rip" on the router first, before configuring the address on the interface.

Miscellaneous

RADIUS accounting does not work if you have separate authentication and accounting servers.
An IP client might not be able to ping the Route Switch Module (RSM). This situation might occur during Token-Ring Virtual LAN (TR VLAN) configuration on the RSM. It is most common when the IP client sends an address resolution protocol (ARP) without a routing information field (RIF), then sends an ARP with a RIF. The situation might also occur if the concentrator relay function (CRF), to which the client is connected, is configured for source-route bridging (SRB). Workaround: Change the CRF mode from SRB to source-route transparent (SRT) bridging.

Novell IPX, XNS, and Apollo Domain

The Internetwork Packet Exchange (IPX) input process might run out of stack, causing a system reload or reduced performance. There is no workaround.

Related Documentation

The following sections describe the documentation available for the Cisco  3600 series routers. Typically, these documents consist of hardware installation guides, software installation guides, Cisco IOS configuration and command references, system error messages, and feature modules, which are updates to Cisco IOS documentation. Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online only.

The most up-to-date documentation can be found on the Web via Cisco  Connection Online (CCO)  and the Documentation CD-ROM.  These electronic documents might contain updates and modifications made after the hard copy documents were printed.

These release notes should be used in conjunction with the documents listed in the following sections:

Release-Specific Documents

The following documents are specific to Release  12.0 T, on which Release 12.0(2)XD is based. They are located on CCO and the Documentation CD-ROM:

To reach the cross-platform Release Notes for Cisco IOS Release 12.0 T on CCO, follow this path:
Spftware & Support: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release  12.0  T
To reach the cross-platform Release Notes for Cisco IOS Release 12.0 on the Documentation CD-ROM, follow this path:
Cisco IOS Software Configuration: Cisco IOS Release 12.0: Release Notes: Cross-Platform Release Notes for Cisco IOS Release 12.0 T
To reach these documents, refer to the Software Center at this path on CCO:
Software & Support: Software Center: Cisco IOS Software
As a supplement to the caveats listed in the "Caveats" section in these release notes, see the Caveats for Cisco IOS Release 12.0 T document, which contains caveats applicable to all platforms for all maintenance releases of Release 12.0 T.
To reach the caveat document on CCO, follow this path:
Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T
To reach the caveat document on the Documentation CD-ROM, follow this path:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS 12.0: Caveats: Caveats for Cisco IOS Release 12.0 T

Feature Modules

Feature modules describe new features supported by Release 12.0 T and are an update to the Cisco  IOS documentation set. They consist of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the features modules are available online only. The feature module information is included in the next printing of the Cisco IOS documentation set.

To reach the feature modules on CCO, follow this path:

Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 T

To reach the feature modules on the Documentation CD-ROM, follow this path:

Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: New Feature Documentation: New Features in Release 12.0 T

Platform-Specific Documents

The documents listed in Table 6 are available for the Cisco  3600 series routers. These documents are also available online at Cisco  Connection Online (CCO)  and on the Documentation CD-ROM.

To reach Cisco 3600 series documentation on CCO, follow this path:

Products & Ordering: Cisco Documentation: Access Servers and Access Routers: Modular Access Routers: Cisco 3600 Series Routers

To reach Cisco 3600 series documentation on the Documentation CD-ROM, follow this path:

Access Servers and Access Routers: Modular Access Routers: Cisco 3600 Series Routers


Table 6: Platform Documents for the Cisco 3600 Series
Book Chapter Topics

Cisco 3620 Router Installation and Configuration Guide

About This Guide
Overview of the Cisco 3620 Router
Preparing to Install the Router
Installing the Router
Configuring the Software
Maintaining the Router
Troubleshooting
Cable Specifications
ROM Monitor
Virtual Configuration Register

Cisco 3640 Router Installation and Configuration Guide

About This Guide
Overview of the Cisco 3640 Router
Preparing to Install the Router
Installing the Router
Configuring the Software
Maintaining the Router
Troubleshooting
Cable Specifications
ROM Monitor
Virtual Configuration Register

Network Module Hardware Installation Guide

About This Guide
Overview of Cisco Network Modules
Preparing to Install Network Modules
Installing a Network Module
Connecting Ethernet Network Modules
Connecting Serial Network Modules
Connecting ISDN BRI Network Modules
Connecting ISDN PRI Network Modules
Connecting Voice Network Modules
Connecting Digital Modem Network Modules
Connecting an ATM Network Module
Connecting HSSI Network Modules
Connecting a Compression Network Module
FCC Class B Compliance

Update to Network Module Hardware Installation Guide

WAN Interface Cards Hardware Installation Guide

About This Guide
Overview of Cisco WAN Interface Cards
Installing a WAN Interface Card in Cisco Modular Routers
Connecting Cisco WAN Interface Cards to a Network
Configuring WAN Interface Cards

Update to WAN Interface Cards Hardware Installation Guide

Cisco 3600 Series Configuration Notes

1-Port Fast Ethernet (FX) Network Module Configuration Note
4-Port Serial Network Module Configuration Note
Cisco 3600 Series Modem Portware Upgrade Configuration Note
Voice Network Module and Voice Interface Card Config Note
Voice over IP Quick Start Guide
Installing and Configuring Flash Memory Cards
Cisco 3600 Series Memory Upgrade Configuration Note
Cisco 3600 and RPS Rack-Mount and Wall-Mount Config Note
Cisco 3600 Series Power Supply Configuration Note
Installing the Cisco RPS Adapter Plate in Cisco 3620 Routers
Installing the Cisco RPS Adapter Plate in Cisco 3640 Routers
Installing Cisco 3600 Series NEBS Level 3 Compliance Kits

Regulatory Compliance and Safety Information for the Cisco 3600 Series

ISDN Safety and Compliance Conditions
Serial WAN Interface Card Independent of Host
Operating Conditions for Canada
Operating Conditions for the United Kingdom
Operating Conditions for the European Community
Agency Approvals
Safety Information

Cisco IOS Software Document Set

The Cisco IOS software documentation set consists of the Cisco  IOS configuration guides, Cisco  IOS command references, and several other supporting documents. These documents are shipped with your order in electronic form on the Documentation CD-ROM, unless you specifically ordered the printed versions.

Documentation Modules and Indexes

Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Each configuration guide can be used in conjunction with its corresponding command reference.

On CCO and the Documentation CD-ROM, two master hot-linked indexes provide indexing information for the Cisco IOS software documentation set: an index for the configuration guides and an index for the command references. In addition, individual books contain a book-specific index.

To reach these indexes on CCO, follow this path:

Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0: Cisco IOS Release 12.0 Configuration Guides and Command References: Configuration Guide Master Index or Command Reference Master Index

To reach these indexes on the Documentation CD-ROM, follow this path:

Cisco IOS Software Configuration: Cisco IOS Release 12.0: Cisco IOS Release 12.0 Configuration Guides and Command References: Configuration Guide Master Index or Command Reference Master Index

To reach documentation related to an index entry, click on the page number following the entry.

Release 12.0 Documentation Set

Table 7 details the contents of the Cisco  IOS Release 12.0 software documentation set. The document set is available in electronic form, and also in printed form upon request.

Note The most current Cisco IOS documentation can be found on the latest Documentation CD-ROM and on the Web. These electronic documents might contain updates and modifications made after the paper documents were printed.

To reach the Cisco IOS documentation set on CCO, follow this path:

Products & Ordering: Cisco Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.0

To reach the Cisco IOS documentation set on the Documentation CD-ROM, follow this path:

Cisco IOS Software Configuration: Cisco IOS Release 12.0


Table 7: Cisco IOS Software Documentation Set for Release 12.0
Books Chapter Topics

  • Configuration Fundamentals Configuration Guide

  • Configuration Fundamentals Command Reference

Configuration Fundamentals Overview
Cisco IOS User Interfaces
File Management
System Management

  • Bridging and IBM Networking Configuration Guide

  • Bridging and IBM Networking Command Reference

Transparent Bridging
Source-Route Bridging
Token Ring Inter-Switch Link
Remote Source-Route Bridging
DLSw+
STUN and BSTUN
LLC2 and SDLC
IBM Network Media Translation
DSPU and SNA Service Point
SNA Frame Relay Access Support
APPN
NCIA Client/Server Topologies
Cisco Mainframe Channel Connection
Airline Product Set

  • Dial Solutions Configuration Guide

  • Dial Solutions Command Reference

Dial-In Port Setup
Dial-In Terminal Services
Dial-on-Demand Routing (DDR)
Dial Backup
Dial-Out Modem Pooling
Large-Scale Dial Solutions
Cost-Control Solutions
ISDN
X.25 over ISDN
VPDN
Dial Business Solutions and Examples

  • Cisco IOS Interface Configuration Guide

  • Cisco IOS Interface Command Reference

Interface Configuration Overview

  • Network Protocols Configuration Guide, Part 1

  • Network Protocols Command Reference, Part 1

IP Addressing
IP Services
IP Routing Protocols

  • Network Protocols Configuration Guide, Part 2

  • Network Protocols Command Reference, Part 2

AppleTalk
Novell IPX

  • Network Protocols Configuration Guide, Part 3

  • Network Protocols Command Reference, Part 3

Apollo Domain
Banyan VINES
DECnet
ISO CLNS
XNS

  • Security Configuration Guide

  • Security Command Reference

AAA Security Services
Security Server Protocols
Traffic Filtering and Firewalls
IP Security and Encryption
Passwords and Privileges
Neighbor Router Authentication
IP Security Options

  • Cisco IOS Switching Services Configuration Guide

  • Cisco IOS Switching Services Command Reference

Switching Paths for IP Networks
Virtual LAN (VLAN) Switching and Routing

  • Wide-Area Networking Configuration Guide

  • Wide-Area Networking Command Reference

ATM
Frame Relay
SMDS
X.25 and LAPB

  • Voice, Video, and Home Applications Configuration Guide

  • Voice, Video, and Home Applications Command Reference

Voice over IP
Voice over Frame Relay
Voice over ATM
Voice over HDLC
Video Support
Universal Broadband Features

  • Quality of Service Solutions Configuration Guide1

  • Quality of Service Solutions Command Reference1

Classification
Scheduling
Packet Drop
Traffic Shaping
ATM QoS
SNA QoS
Line Protocols

  • Cisco IOS Software Command Summary

  • Dial Solutions Quick Configuration Guide

  • System Error Messages

  • Debug Command Reference

1This book will not be available until January 1999.

Service and Support

For service and support for a product purchased from a reseller, contact the reseller. Resellers offer a wide variety of Cisco  service and support programs, which are described in the section "Service and Support" in the information packet that shipped with your product.

Note If you purchased your product from a reseller, you can access CCO as a guest. CCO is Cisco  Systems' primary real-time support channel. Your reseller offers programs that include direct access to CCO services.

For service and support for a product purchased directly from Cisco, use CCO.

Software Configuration Tips on the Cisco TAC Home Page

For helpful tips on configuring Cisco products, follow this path on CCO:

Software & Support: Technical Tips (button on left margin)

"Hot Tips" are popular tips and hints gathered from Cisco's Technical Assistance Center (TAC). Most of these documents are also available from the TAC's Fax-on-Demand service. To reach Fax-on-Demand and receive documents at your fax machine, call 888-50-CISCO (888-502-4726). From international areas, call 650-596-4408.

The following sections are provided from the Technical Tips page:

Cisco Connection Online

Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.

Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.

CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.

You can reach CCO in the following ways:

For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.

Note If you are a network administrator and need personal technical assistance with a Cisco product that is under warranty or covered by a maintenance contract, contact Cisco's Technical Assistance Center (TAC) at 800  553-2447, 408  526-7209, or tac@cisco.com. To obtain general information about Cisco Systems, Cisco products, or upgrades, contact 800  553-6387, 408  526-7208, or cs-rep@cisco.com.

Documentation CD-ROM

Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also reach Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.

If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.





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Posted: Thu Jan 28 10:39:33 PST 1999
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