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This feature module describes the OC-12c Dynamic Packet Transport Interface Processor (DPTIP) feature.
This document includes the following sections:
The OC-12c Dynamic Packet Transport (DPT) Interface Processor (DPTIP) is available on Cisco 7500 series routers. The DPT is an OC-12c interface that uses second-generation Versatile Interface Processor (VIP2) technology to provide a shared IP-over-SONET capability and it complies with IEEE 802.3 specifications for multicast and broadcast media. The DPTIP assembly consists of a VIP2 with a dual-width DPT interface processor permanently attached to it.
The following benefits are offered by the DPTIP for the Cisco 7500 series routers:
For related information on this feature, refer to the following documents:
MIBs
RFCs
Standards
The DPTIP is compatible with any Cisco 7500 series router equipped with the correct Route Switch Processor (RSP2 or RSP4), running Cisco IOS Release 12.0(6)S or later.
See the following sections for configuration tasks for the DPT interface. Each task in the list indicates if the task is optional or required.
For information on other configuration tasks for the DPTIP interface processor, refer to the "Configure an Ethernet" section in the "Configuring Interfaces" chapter of the Configuration Fundamentals Configuration Guide.
For information on other commands that can be used by the DP interface, refer to the Cisco IOS Release 12.0 configuration guides.
| Command | Purpose | |
|---|---|---|
Step 1 | Router# show running-config | Confirms that the system recognizes the DPTIP. |
Step 2 | Router# configure terminal | Enables configuration mode. |
Step 3 | Router# (config)# ip routing | Enables IP routing. |
Step 4 | Router(config)# interface srp slot/port-adapter/port | Specify interface. The interface type of the DPTIP is SRP1. |
Step 5 | Router(config-if)# ip address 192.168.2.3 255.255.255.10 | Assign an IP address and subnet mask to the interface. |
Step 6 | Add any additional configuration subcommands required to enable routing protocols, and set the interface characteristics for your configuration requirements. |
|
Step 7 | Router(config)# no shutdown | |
Step 8 | Ctrl-Z | When you have included all the configuration subcommands to complete the configuration, press Ctrl-Z to exit configuration mode. |
Step 9 | Router# copy running-config startup-config | Writes the new configuration to the start up configuration. |
| 1SRP= Spatial Reuse Protocol |
The system displays an OK message when the configuration has been stored.
Router# show running-config Building configuration... Current configuration: version 12.0(8)S service timestamps debug uptime service timestamps log datetime no service password-encryption service udp-small-servers service tcp-small-servers ! hostname uut2 ! interface SRP1/0/0 mac-address 0010.5555.6666 ip address 192.168.0.20 255.255.255.0 no ip directed-broadcast ip route-cache distributed
Step 2 Use the show version command to display the configuration of the system hardware and Cisco IOS software information. The following example shows that the Cisco IOS version is 12.0(8)S and a DPTIP is installed:
router#show version Cisco Internetwork Operating System Software IOS (tm) RSP Software (RSP-JSV-M), Version 12.0(8)S, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Sat 18-Dec-99 00:28 by htseng Image text-base:0x60010908, data-base:0x610B2000 ROM:System Bootstrap, Version 11.1(2) [nitin 2], RELEASE SOFTWARE (fc1) BOOTFLASH:GS Software (RSP-BOOT-M), Version 11.1(8)CA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) manta uptime is 8 minutes System returned to ROM by reload System image file is "tftp://223.255.254.254/muck/shirjosh/rsp-jsv-mz.120-8.S" cisco RSP2 (R4700) processor with 131072K/2072K bytes of memory. R4700 CPU at 100Mhz, Implementation 33, Rev 1.0 Last reset from power-on G.703/E1 software, Version 1.0. G.703/JT2 software, Version 1.0. X.25 software, Version 3.0.0. SuperLAT software (copyright 1990 by Meridian Technology Corp). Bridging software. TN3270 Emulation software. Chassis Interface. 1 EIP controller (2 Ethernet). 2 VIP2 controllers (2 FastEthernet)(1 POS). 1 FEIP controller (2 FastEthernet). 2 Ethernet/IEEE 802.3 interface(s) 4 FastEthernet/IEEE 802.3 interface(s) 1 Packet over SONET network interface(s) 123K bytes of non-volatile configuration memory. 20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K). 8192K bytes of Flash internal SIMM (Sector size 256K). No slave installed in slot 3. Configuration register is 0x0
The SRP interface uses ring architecture to provide redundancy and protection from a failed node or fiber cut through the use of Intelligent Protection Switching (IPS). The tasks described in this section are optional.
| Command | Purpose | |
|---|---|---|
Step 1 | Router# configure terminal | Enables configuration mode. |
Step 2 | Router(config)# interface srp slot/port-adapter/port | Configure an SRP interface. |
Step 3 | Router(config-if)# srp ips request manual-switch a | Specifies an IPS manual switch on side A. |
Step 4 | Router(config-if)# srp ips wtr-timer 10 | Specifies a wait-to-restore request (in seconds) to prevent switch oscillations. |
Step 5 | Router(config-if)# srp ips timer 20 a | Configures a message timer to be sent to the inner and outer rings to control the frequency of IPS message transmissions on side A. |
Step 6 | Router(config-if)# ^Z | Exits back to EXEC mode so you can perform verification steps. |
Use the show srp command to determine whether an intelligent protection switch is enabled or idle:
router#show srp ips srp2/0/0
IPS Information for Interface SRP2/0/0
MAC Addresses
Side A (Outer ring RX) neighbor 0000.0000.0002
Side B (Inner ring RX) neighbor 0000.0000.0001
Node MAC address 0000.0000.0004
IPS State
Side A not wrapped
Side B not wrapped
Side A (Inner ring TX) IPS pkt. sent every 1 sec. (next pkt. after 0 sec.)
Side B (Outer ring TX) IPS pkt. sent every 1 sec. (next pkt. after 0 sec.)
IPS WTR period is 60 sec. (timer is inactive)
Node IPS State IDLE
IPS Self Detected Requests IPS Remote Requests
Side A IDLE Side A IDLE
Side B IDLE Side B IDLE
IPS messages received
Side A (Outer ring RX) {0000.0000.0002,IDLE,S}, TTL 128 age 00:00:04
Side B (Inner ring RX) {0000.0000.0001,IDLE,S}, TTL 128 age 00:00:00
IPS messages transmitted
Side A (Inner ring TX) {0000.0000.0004,IDLE,S}, TTL 128
Side B (Outer ring TX) {0000.0000.0004,IDLE,S}, TTL 128
Every node on a DPT ring maintains a topology map of the ring, so that it knows where to route traffic. It updates the topology map by periodically sending a query, called a topology discovery packet, out onto the outer-ring path. Each node on the ring adds its own MAC address to the packet. When the discovery packet returns to the originating node, the contents of the packet are used to update the topology map. You use the srp topology-timer command to set the frequency with which the node sends out topology discovery packets.
| Command | Purpose | |
|---|---|---|
Step 1 | Router# configure terminal | Enables configuration mode. |
Step 2 | Router(config)# interface srp slot/port-adapter/port | Configure an SRP interface. |
Step 3 | router(config-if)# srp topology-timer 70 | Configures the frequency of the topology message timer in seconds. |
Step 4 | router(config-if)# ^Z | Exits back to EXEC mode so you can perform verification steps. |
Step 5 | router# show srp topology | Confirm the identity of the nodes on the ring by entering the show srp topology command. The command output also shows the number of hops between nodes and identifies the nodes that are in wrap mode. |
Enter the show srp topology command to confirm the identity of the nodes on the ring. The command output also shows the number of hops between nodes and identifies the nodes that are in wrap mode:
Use the show srp topology command to show the identity of the nodes on the DPT ring according to their MAC addresses. The following example shows a three-node DPT ring.
router#show srp topology
Topology Map for Interface SRP2/0/0
Topology pkt. sent every 5 sec. (next pkt. after 4 sec.)
Last received topology pkt. 00:00:00
Nodes on the ring:4
Hops (outer ring) MAC IP Address Wrapped Name
0 0000.0000.0004 2.2.2.4 No stingray
1 0000.0000.0001 2.2.2.1 No npe300
2 0000.0000.0005 2.2.2.5 No gsr
3 0000.0000.0002 2.2.2.2 No tuna
This section provides the following configuration examples:
In the following example, the OC-12c DPTIP SRP interface is specified and the IP address and subnet mask is assigned to the interface.
Router(config)# interface srp 0/1/0 Router(config-if)# ip address 192.168.2.3 255.255.255.0
In the following example the SRP IPS options are configured:
Router(config)# interface srp slot/port-adapter/port srp ips request manual-switch a srp ips wtr-timer 60 srp ips timer 90
In the following example, the identity of the nodes on the DPT ring according to their MAC addresses is shown. The following example shows a three-node DPT ring. Nodes 0 and 2 are wrapped:
router#sh srp top
Topology Map for Interface SRP2/0/0
Topology pkt. sent every 5 sec. (next pkt. after 4 sec.)
Last received topology pkt. 00:00:00
Nodes on the ring:4
Hops (outer ring) MAC IP Address Wrapped Name
0 0000.0000.0004 2.2.2.4 No stingray
1 0000.0000.0001 2.2.2.1 No npe300
2 0000.0000.0005 2.2.2.5 No gsr
3 0000.0000.0002 2.2.2.2 No tuna
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command reference publications.
The SRP interface provides commands to enforce quality of service (QoS) functionality on the transmit side and receive side of Cisco routers. SRP uses the IP type of service (ToS) field values to determine packet priority.
On the transmit side the SRP interface classifies traffic into high- and low- priority traffic. High- priority traffic is rate shaped and has higher priority than low-priority traffic. The user has the option to configure high- or low-priority traffic and can rate limit the high-priority traffic.
To make adjustments to buffer settings on the receive side for different priority traffic, use the srp buffer-size interface configuration command. Use the no form of this command to disable buffer size configurations.
srp buffer-size receive [high | medium]
Syntax Description Syntax Description
receive Allocates synchronous dynamic random-access memory (SDRAM) buffer for incoming packets. high | medium Buffer size for high- or medium-priority packets. Any number from 16 to 8192 in bytes.
Defaults
high = 4096 kbytes, medium = 4096 kbytes, low = 8192 kbytes
Command Modes
Interface configuration mode
Command History
12.0(6)S This command was introduced.
Release
Modification
Examples
The following example shows the buffer size for the receive side at the high setting of 17 kbytes:
router(config-if)# srp buffer-size receive high 17
Related Commands Related Commands
mtu bytes Adjusts the maximum packet size MTU size.1 srp deficit-round-robin Sets SRP parameters.
Command
Description
1MTU = maximum transmission unit
To transfer packets from the internal receive buffer to IOS, use the srp deficit-round-robin configuration command. Use the no form of this command to disable srp deficit-round-robin.
srp deficit-round-robin [input | output] [quantum | deficit]
Syntax Description Syntax Description
input | output Either input or output is specified. high | medium | low Priority queue level. quantum DRR quantum value. Any number from 9216 to 32767. The default is 9216. deficit DRR deficit value. Any number from 0 to 65535. The default is 16384.
Defaults
quantum = 9216, deficit = 16384
Command Modes
Configuration mode
Command History
12.0(6)S This command was first introduced.
Release
Modification
Examples
The following example shows packets configured for the high-priority input queue:
Router(config-if)# srp deficit-round-robin input high deficit
Related Commands Related Commands
srp priority-map receive Enables classification of packets as high, medium, or low based on the IP TOS value srp buffer-size Modifies the buffer space allocated for different priority traffic. By default high- and medium-priority packets get 4 MB of buffer space, and low-priority packets get 8 MB of buffer space. srp random-detect Enables user to tune WRED parameters on packets received through the SRP interface.
Command
Description
To loop the SRP interface on a OC-12c DPTIP, use the srp loopback interface configuration command. Use the no form of this command to remove the loopback.
srp loopback {internal | line} {a | b}
Syntax Description
internal | line Sets the loopback toward the network before going through the framer (internal), or loops the payload data toward the network (line). a Loopback the A side of the interface (inner tx, outer rx) b Loopback the B side of the interface (outer tx, inner rx).
Defaults
Disabled
Command Modes
Interface configuration
Command History
12.0(6)S This command was modified.
Release
Modification
Usage Guidelines
Use this command for troubleshooting purposes.
Examples
The following example configures the loopback test on the a side of the SRP interface:
srp loopback line a
To set priority mapping for transmitting and receiving packets, use the srp priority-map configuration command. Use the no form of this command to disable priority mapping.
srp priority-map {receive} {high | medium | low}{transmit}{high | medium}
Syntax Description Syntax Description
receive | transmit Receiving or transmitting. high | medium Mapping for high- or medium-priority packets. Range is between 1 and 8. low Specifies mapping for low-priority packets on the receive side.
Defaults
receive high = 5, receive medium = 3, transmit = 7
Command Modes
Configuration mode
Command History
12.0(6)S This command was introduced.
Release
Modification
Usage Guidelines
The SRP interface provides commands to enforce quality of service (QoS) functionality on the transmit side and receive side of Cisco routers. SRP uses the IP type of service (ToS) field values to determine packet priority.
The SRP interface classifies traffic on the transmit side into high- and low-priority traffic. High-priority traffic is rate shaped and has higher priority than low-priority traffic. You have the option to configure high- or low-priority traffic and can rate limit the high-priority traffic.
The command srp priority-map transmit enables the user to specify IP packets with <tos-value> and above to be considered as high-priority traffic.
On the receive side, when WRED is enabled, SRP hardware classifies packets into high-, medium-, and low-priority packets based on IP ToS value. After classification, it stores the packet into the internal receive buffer. The receive buffer is partitioned for each priority packet. Cisco routers can employ WRED based on the IP ToS value. Routers also employ the Deficit Round Robin (DRR) algorithm to transfer packets from the internal receive buffer to IOS.
The command srp priority-map receive enables the user to classify packets as high, medium, or low based on the IP ToS value.
Examples
The following example configures the Cisco 7500 series routers to transmit packets with priority greater than 5 as high priority packets :
Router(config-if)# srp priority-map transmit 5
Related Commands Related Commands
random detect Configures WRED parameters on packets received through an SRP interface.
Command
Description
To configure WRED parameters on packets received through an SRP interface, use the srp random-detect interface configuration command. Use the no form of this command to return the value to the default.
srp random-detect [enable | compute-interval | input | precedence]
Syntax Description
compute-interval Interval in the range of 1 to 128 nsec used to specify the queue depth compute interval. enable Enable WRED input WRED on packet input path. high | low | medium Priority queue level. exponential-weight Queue weight in bits. Any number from 0 to 6. precedence Input queue precedence.
Defaults
128 seconds
Command Modes
Interface configuration command
Command History
12.0(6)S This command was introduced.
Release
Modification
Examples
The following example has configured WRED parameters on packets received through an SRP interface with a weight factor of 5:
Router(config-if)# srp random-detect input high exponential-weight 5
To disable the SRP interface, use the shutdown interface configuration command. To restart a disabled interface, use the no form of this command.
srp shutdown [a | b]Syntax Description
a | Specifies side A of the SRP interface. |
b | Specifies side B of the SRP interface. |
Defaults
Not enabled
Command Modes
Interface configuration
Command History
12.0(6)S This command was introduced.
Release
Modification
Usage Guidelines
The srp shutdown command disables all functions on the specified side.
Examples
The following example turns off the A side of the SRP interface:
srp shutdown a
To limit the amount of high-priority traffic that the SRP interface can handle, use the srp tx-traffic-rate configuration command. Use the no form of this command to disable transmitted traffic rate.
srp tx-traffic number
Syntax Description Syntax Description
number The range in kilobits. The range is 1 to 65535.
Defaults
10 Mbps
Command Modes
Configuration mode
Command History
12.0(6)S12.0(6)S This command was introduced.
Release
Modification
Examples
The following example shows SRP transmitted traffic transmitting at 1000 kilobits per second:
Router(config-if)# srp tx-traffic-rate 1000
DPT---Dynamic Packet Transport.
DPTIP---Dynamic Packet Transport Interface Processor.
DRR---Deficit Round Robin.
IPS---Intelligent Protection Switching.
MAC---Media Access Control.
MTU---Maximum Transmission Unit.
QoS---Quality of Service.
RSP---Route Switch Processor.
SDRAM---Synchronous Dynamic Random-access Memory.
SONET---Synchronous Optical Network. An American National Standards Institute (ANSI) standard (T1.1051988) for optical digital transmission at hierarchical rates from 51.840 Mbps (OC-1) to 2.488 Gbps (OC-48) and higher.
SRP---Spatial Reuse Protocol. A Layer 2 MAC protocol for use with DPT, SONET, and SDH rings that runs over a dual-ring network topology and is characterized by shared media, statistical multiplexing, global fairness, and spatial reuse.
ToS---Type of Service.
VIP2---Versatile Interface Processor.
WRED---Weighted Random Early Detection.
Posted: Mon Feb 7 12:46:01 PST 2000
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