Table Of Contents
Dynamic Packet Transport OC-12c Port Adapter for the 7200 Router
Supported Standards, MIBs, and RFCs
Configuring the Dynamic Packet Transport Interface
Configuring Intelligent Protection Switching
Verifying Intelligent Protection Switching
Dynamic Packet Transport OC-12c Port Adapter for the 7200 Router
This feature module describes the OC-12c Dynamic Packet Transport (DPT) Port Adapter feature.
This document includes the following sections:
•
Supported Standards, MIBs, and RFCs
Feature Overview
The dual-width OC-12c Dynamic Packet Transport (DPT) port adapter is available on Cisco 7200 series routers and Cisco 7200 VXR series routers. The DPT is an OC-12c interface used in Cisco 7200 series and Cisco 7200 VXR routers to provide a shared IP-over-SONET capability.
Benefits
The following benefits are offered by the DPT for the Cisco 7200 and Cisco 7200 VXR series routers:
•
•
•
Related Documents
OC-12c Dynamic Packet Transport Port Adapter Installation and Configuration.
Supported Platforms
•
•
Supported Standards, MIBs, and RFCs
Standards
•
MIBs
•
RFCs
•
Prerequisites
The DPT is compatible with any Cisco 7200 series router equipped with the correct Route Switch Processor (RSP2 or RSP4), running Cisco IOS Release 12.0(6)S or later.
Configuration Tasks
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 commands that can be used by the DPT interface, refer to the Cisco IOS Release 12.1 configuration guides.
Configuring the Dynamic Packet Transport Interface
Step 1
Router# show running-config
Confirms that the system recognizes the DPT.
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
Specify interface.
The interface type of the DPT is SRP1 .
Step 5
Router(config-if)# ip address 192.168.2.3 255.255.255.0
Assigns 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
Changes the shutdown state to up and enables the interface.
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.
1 SRP= Spatial Reuse Protocol
The system displays an OK message when the configuration has been stored.
Verifying DPT
Step 1
Router# show running-configBuilding configuration...Current configuration:version 12.0(8)Sservice timestamps debug uptimeservice timestamps log datetimeno service password-encryptionservice udp-small-serversservice tcp-small-servers!hostname uut2!interface SRP1/0mac-address 0010.5555.6666ip address 192.168.0.20 255.255.255.0no ip directed-broadcastip route-cache distributedStep 2
Router# show versionCisco Internetwork Operating System SoftwareIOS (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 htsengImage text-base:0x60010908, data-base:0x610B2000ROM: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 minutesSystem returned to ROM by reloadSystem 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 1.0Last reset from power-onG.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
Configuring Intelligent Protection Switching
The SRP interface uses ring architecture to provide redundancy and protection from a failed node or a fiber cut by using the Intelligent Protection Switching (IPS). The tasks described in this section are optional.
Verifying Intelligent Protection Switching
Router# show srp ips srp1/0IPS Information for Interface SRP1/0MAC AddressesSide A (Outer ring RX) neighbor 0000.0000.0002Side B (Inner ring RX) neighbor 0000.0000.0001Node MAC address 0000.0000.0004IPS StateSide A not wrappedSide B not wrappedSide 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 IDLEIPS Self Detected Requests IPS Remote RequestsSide A IDLE Side A IDLESide B IDLE Side B IDLEIPS messages receivedSide A (Outer ring RX) {0000.0000.0002,IDLE,S}, TTL 128 age 00:00:04Side B (Inner ring RX) {0000.0000.0001,IDLE,S}, TTL 128 age 00:00:00IPS messages transmittedSide A (Inner ring TX) {0000.0000.0004,IDLE,S}, TTL 128Side B (Outer ring TX) {0000.0000.0004,IDLE,S}, TTL 128Configuring DPT Topology
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.
Verifying DPT Topology
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 topologyTopology Map for Interface SRP2/0Topology pkt. sent every 5 sec. (next pkt. after 4 sec.)Last received topology pkt. 00:00:00Nodes on the ring:4Hops (outer ring) MAC IP Address Wrapped Name0 0000.0000.0004 2.2.2.4 No stingray1 0000.0000.0001 2.2.2.1 No npe3002 0000.0000.0005 2.2.2.5 No gsr3 0000.0000.0002 2.2.2.2 No tunaConfiguration Examples
This section provides the following configuration examples:
•
DPT Port Adapter
In the following example, the OC-12c DPT SRP interface is specified and the IP address and subnet mask are assigned to the interface.
Router(config)# interface srp 0/1Router(config-if)# ip address 192.168.2.3 255.255.255.0IPS
In the following example the SRP IPS options are configured:
Router(config)# interface srp slot/portsrp ips request manual-switch asrp ips wtr-timer 60srp ips timer 90DPT Topology
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.
Router# show srp topologyTopology Map for Interface SRP2/0Topology pkt. sent every 5 sec. (next pkt. after 4 sec.)Last received topology pkt. 00:00:00Nodes on the ring:4Hops (outer ring) MAC IP Address Wrapped Name0 0000.0000.0004 2.2.2.4 No stingray1 0000.0000.0001 2.2.2.1 No npe3002 0000.0000.0005 2.2.2.5 No gsr3 0000.0000.0002 2.2.2.2 No tunaCommand Reference
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.1 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.
srp buffer-size
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]
no srp buffer-size receive [high | medium]
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 kbytesCommand Modes
Interface configuration
Command History
12.0(6)S
This command was introduced.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
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 17Related Commands
mtu bytes
Adjusts the maximum packet size MTU size.1
srp deficit-round-robin
Sets SRP parameters.
1 MTU = maximum transmission unit
srp deficit-round-robin
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] [high | medium | low] [quantum | deficit]
no srp deficit-round-robin
Syntax DescriptionSyntax Description
Defaults
quantum = 9216
deficit = 16384Command Modes
Configuration
Command History
Command HistoryCommand History
12.0(6)S
This command was first introduced.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
Examples
The following example shows packets configured for the high-priority input queue:
Router(config-if)# srp deficit-round-robin input high deficitRelated CommandsRelated Commands
srp loopback
To loop the SRP interface on a OC-12c DPT, use the srp loopback interface configuration command. Use the no form of this command to remove the loopback.
srp loopback {internal | line} {a | b}
no srp loopback
Syntax DescriptionSyntax Description
Defaults
Disabled
Command Modes
Interface configuration
Command History
Command Historymmand History
12.0(6)S
This command was modified.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
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 asrp priority-map
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]}
no srp priority-map
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 = 7Command Modes
Configuration
Command History
12.0(6)S
This command was introduced.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
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 values equal to or greater than the ToS value 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 7200 series routers to transmit packets with priority greater than 5 as high-priority packs:
Router(config-if)# srp priority-map transmit 5Related CommandsRelated Commands
random detect
Configures WRED parameters on packets received through an SRP interface.
srp random-detect
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 {compute-interval | enable | input | [high | low | medium] |
exponential-weight | precedence]
no srp random-detect
Syntax DescriptionSyntax Description
Defaults
128 seconds
Command Modes
Interface configuration
Command History
12.0(6)S
This command was introduced.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
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 5srp shutdown
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]
no srp shutdown [a | b]
Syntax Description
Defaults
Not enabled
Command Modes
Interface configuration
Command History
12.0(6)S
This command was introduced.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
Usage Guidelines
The srp shutdown command disables all functions on the specified interface.
Examples
The following example turns off the A side of the SRP interface:
srp shutdown asrp tx-traffic-rate
To limit the amount of high-priority traffic that the SRP interface can handle, use the srp tx-traffic-rate interface configuration command. Use the no form of this command to disable transmitted traffic rate.
srp tx-traffic number
no srp tx-traffic number
Syntax Description
Defaults
10 Mbps
Command Modes
Interface configuration
Command History
12.0(6)S
This command was introduced.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
Examples
The following example shows SRP transmitted traffic transmitting at 1000 kilobits per second:
Router(config-if)# srp tx-traffic-rate 1000Glossary
DPT—Dynamic Packet Transport.
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.
WRED—Weighted Random Early Detection.
Guest