Cisco Cisco IOS Software Release 12.0(22)S

This section provides configuration examples.

In the following example, per-VC queue limits are configured on a single queue.

First, configure the policy map:

Router(config)# policy-map qlimit1

Router(config-pmap)# class class-default

Router(config-pmap-c)# queue-limit 576 cells

Router(config-pmap-c)# exit

Router(config-pmap)# exit

Then, attach the policy map to an ATM subinterface.

Router(config)# int atm4/0.1 point-to-point

Router(config-subif)# pvc 4/11

Router(config-if-atm-vc)# service-policy output qlimit1

In the following example, simple WRED is configured on a VC without MDRR.

In this example, class-default is a special class.  It is the only kind of class that can be configured without 
using the bandwidth or priority commands.

Router(config)# policy-map WRED-1

Router(config-pmap)# class class-default ! <- must use class-default for

Router(config-pmap)#                  ! per-VC WRED without per-VC MDRR

Router(config-pmap-c)# random-detect

Router(config-pmap-c)# random-detect exponential-weighting-constant 10

Router(config-pmap-c)# random-detect precedence 0 300 cells 700 cells 1

Router(config-pmap-c)# random-detect precedence 1 350 cells 800 cells 1

Router(config-pmap-c)# random-detect precedence 2 400 cells 900 cells 1

Router(config-pmap-c)# random-detect precedence 3 450 cells 1000 cells 1

Router(config-pmap-c)# random-detect precedence 4 500 cells 1100 cells 1

Router(config-pmap-c)# random-detect precedence 5 550 cells 1200 cells 1

Router(config-pmap-c)# random-detect precedence 6 600 cells 1300 cells 1

Router(config-pmap-c)# random-detect precedence 7 650 cells 1400 cells 1

Once the policy map has been created, configure it on the VC using the service-policy command:

Router(config-if)# exit

Router(config)# int atm1/0.1

Router(config-if)# pvc 1/1

Router(config-if-atm-vc)# service-policy output WRED-1

Using MDRR, the 8-Port OC-3 STM-1 ATM line card supports up to eight queues for classes of traffic 
per VC. One of the queues is always reserved for a special class called class-default. Up to seven of the 
classes are normal queues, including the class-default queue. The eighth class is always a low latency 
queue.