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Distributed Traffic Shaping (DTS) for Engine 0 Line Cards in the Cisco 12000 Gigabit Switch Router (GSR) is similar to the Generic Traffic Shaping feature implemented in Cisco IOS Release 11.2. Traffic shaping implemented for engine 0-type line cards provides different features from the distributed traffic shaping support in Cisco IOS Release 12.0(5)XE.
Table 1 lists the line card engine and the line cards that use DTS.
| Line Card Engine | Line Cards Using DTS |
|---|---|
Engine 0 | QOC-3 POS |
Distributed Traffic Shaping supports traffic shaping regardless of the encapsulation. The traffic shaping implementation is per interface on a line card. Currently the traffic shaping scheme assumes one queue per interface. DTS on GSR can shape the output traffic to the specified bit rate. Excessive packets are stored in a buffer in the traffic shaping queue and transmitted later.
The DTS feature is one element used to manage the bandwidth of an interface to avoid congestion, to meet remote site requirements, and to conform to a service rate that is provided on that interface.
DTS on GSR for engine 0 line cards is subject to the following restrictions:
This feature is supported on the following Cisco 12000 series routers:
This feature is supported on the following Cisco 12000 line cards (see Table 1):
You must be running Cisco IOS Release 12.0(10)S or a later version of Cisco IOS Release 12.0 S.
No new or modified MIBs are supported by this feature.
Perform the following tasks to configure DTS on GSR:
To configure DTS on GSR for outbound traffic on an interface, use the following command in interface configuration mode:
traffic-shape rate bit-rate [burst-size Configure traffic shaping for outbound traffic on an interface.
Command
Purpose
[excess-burst-size]]
To monitor the current traffic shaping configuration and statistics, use any of the following commands in EXEC mode:
show traffic-shape [interface-name] Show the current traffic-shaping configuration. show traffic-shape statistics [interface-name] Show the current traffic-shaping statistics.
Command
Purpose
This section provides the following configuration examples:
The following configuration example shows how to enable DTS for an OC-12 POS line card in a GSR. The output on the interface is configured to limit all output to 5 Mbps.
router(config)# interface pos 4/0 router(config-if)# traffic-shape rate 5000000 625000 625000
This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.
To configure line cards in a Cisco 12000 GSR to use Distributed Traffic Shaping (DTS), use the traffic-shape rate interface configuration command. Use the no form of this command to disable DTS.
[no] traffic-shape rate bit-rate [burst-size [excess-burst-size]]
bit-rate | A value between 1 and 155520000 for QOC-3 POS line card and between 1 and 622080000 for the OC-12 POS line card. |
burst-size | The number of bits in a measurement interval. The value can be between 1 and 155520000 for QOC-3 POS line card and between 1 and 622080000 for the OC-12 POS line card. |
excess-burst-size | The number of bits permitted to exceed the burst size. The value can be between 0 and 155520000 for QOC-3 POS line card and between 0 and 622080000 for the OC-12 POS line card. |
No default behavior or values.
Interface
| Release | Modification |
|---|---|
12.0(10)S | This command was modified to accommodate engine 0 line rates. |
You must use this command to enable the DTS on the engine 0 line cards. Table 2 lists the line card engine and the line cards that use DTS. Using this command has no effect when non-supported line cards are installed in the GSR.
| Line Card Engine | Line Cards Using DTS |
|---|---|
Engine 0 | QOC-3 POS |
The following example limits interface transmission to 5 Mbps on the selected line card interface:
traffic-shape rate 5000000 625000 625000
None
Posted: Thu Mar 30 15:58:56 PST 2000
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