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Catalyst 3750 Metro Switch Software Configuration Guide
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Chapter 26 Configuring QoS
Configuring Hierarchical QoS
To delete an existing policy map, use the no policy-map policy-map-name global configuration
command. To delete an existing class, use the no class class-name policy-map configuration command.
To disable the priority queue, use the no priority policy-map class configuration command.
This example shows how to configure a class-level policy called policy1 that has two classes. Class 1 has
10 percent of the available bandwidth. Class 2 is configured as the priority queue, which is serviced first
until it is empty.
Switch(config)# class-map class1
Switch(config-cmap)# match mpls experimental 2 3 4
Switch(config-cmap)# exit
Switch(config)# class-map class2
Switch(config-cmap)# match mpls experimental 7
Switch(config-cmap)# exit
Switch(config)# policy-map policy1
Switch(config-pmap)# class class1
Switch(config-pmap-c)# bandwidth percent 10
Switch(config-pmap-c)# exit
Switch(config-pmap)# class class2
Switch(config-pmap-c)# priority
Switch(config-pmap-c)# exit
Switch(config-pmap)# exit
Switch(config)# interface gigabitethernet1/1/2
Switch(config-if)# service-policy output policy1
This example shows how to configure a VLAN-level policy called parent. It matches packets with VLAN
101 and associates a class-level child policy called policy1. The gold class is configured as the priority
queue, whereas the silver class and vlan101 class each have 20 percent of the available bandwidth
assigned to them. DSCP-based WRED is used as the drop policy. For the af21 value in the silver class,
WRED randomly drops packets with this DSCP when the minimum threshold reaches 28. When the
average queue size exceeds the maximum threshold of 35, WRED drops all packets with DSCP af21.
The mark-probability denominator is set to 10, which means that one out of every 10 packets is dropped
when the average queue is at the maximum threshold. The configuration has similar settings for af22 in
the silver class.
Switch(config)# class-map gold
Switch(config-cmap)# match ip dscp af11 af12
Switch(config-cmap)# exit
Switch(config)# class-map silver
Switch(config-cmap)# match ip dscp af21 af22
Switch(config-cmap)# exit
Switch(config)# class-map vlan101
Switch(config-cmap)# match vlan 101
Switch(config-cmap)# exit
Switch(config)# policy-map policy1
Switch(config-pmap)# class gold
Switch(config-pmap-c)# priority
Switch(config-pmap-c)# exit
Switch(config-pmap)# class silver
Switch(config-pmap-c)# bandwidth percent 20
Switch(config-pmap-c)# random-detect dscp-based
Step 10
show policy-map [policy-map-name [class
class-map-name]]
or
show policy-map interface interface-id
Verify your entries.
Step 11
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
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