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24-13
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 24 Configuring QoS
Understanding QoS
Router(config-cmap)# match ip dscp 23
Router(config-cmap)# exit
Router(config)# class-map match-any dscp-63 voice
Router(config-cmap)# match ip dscp-63
Router(config-cmap)# exit
Router(config)# policy-map customer-1-ingress
Router(config-pmap)# class class-default
Router(config-pmap-c)# service-policy child_policy-1
Note You can also enter the match criteria as match vlan 100 200 300 in the child-level policy-map.
Router(config)# policy-map child policy-1
Router(config-pmap)# class dscp-63 voice
Router(config-pmap-c)# police cir 10000000 bc 50000
Router(config-pmap-c)# conform-action set-cos-transmit 5
Router(config-pmap-c)# exceed-action drop
Router(config-pmap-c)# exit
Router(config-pmap)# class dscp-1 data
Router(config-pmap-c)# set cos 0
Router(config-pmap-c)# exit
Router(config-pmap)# class dscp-23 video
Router(config-pmap-c)# set cos 4
Router(config-pmap-c)# set ip precedence 4
Router(config-pmap-c)# exit
Router(config)# interface gigabitethernet0/1
Router(config-if)# service instance 100 ethernet
Router(config-if)# encapsulation dot1q 100
Router(config-if)# service-policy input customer-1-ingress
Router(config-if)# rewrite ingress tag pop 1 symmetric
Router(config-if)# bridge-domain 100
Table Maps
You can use table maps to manage a large number of traffic flows with a single command. You can
specify table maps in set commands and use them as mark-down mapping for the policers. You can also
use table maps to map an incoming QoS marking to a replacement marking without having to configure
a large number of explicit matches and sets. Table maps are used only in input policy maps.
Table maps can be used to:
• Correlate specific CoS, DSCP, or IP precedence values to specific CoS, DSCP, or IP precedence
values
• Mark down a CoS, DSCP, or IP precedence value
• Assign defaults for unmapped values
This example creates a table to map specific CoS values to DSCP values. The unspecified values are all
mapped to a to-value of 0.
Router(config)# table-map cos-dscp-tablemap
Router(config-tablemap)# map from 5 to 46
Router(config-tablemap)# map from 6 to 56
Router(config-tablemap)# map from 7 to 57
Router(config-tablemap)# exit
The Cisco ASR 901 router supports a maximum of 32 unique table maps. You can enter up to 64
different map from–to entries in a table map. These table maps are supported on the router: