Cisco Catalyst 3750 Metro - Page 90

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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
cpu traffic qos precedence
The mutation keyword configures the switch to change the incoming value according to the global
mutation-map configuration.
When you configure the switch to trust CoS, the configuration applies to both IP and non-IP traffic.
When you configure the switch to trust or change DSCP or precedence but not CoS, the configuration
applies only to IP traffic.
When you configure the switch to trust CoS and trust or change DSCP or precedence, then trust CoS
applies to non-IP traffic and trust or change DSCP or precedence applies to IP traffic.
The cpu traffic qos precedence global configuration command configures precedence marking for
CPU-generated traffic by trusting precedence, mutating precedence or specifying a precedence value. A
new configuration overwrites the existing configuration.
The cpu traffic qos dscp and cpu traffic qos precedence global configuration commands are mutually
exclusive. A new configuration overwrites the existing configuration.
Examples The following example shows how to configure a precedence value of 2 for CPU traffic:
Switch(config)# cpu traffic qos precedence 2
This example shows how to configure the switch to trust the precedence value of incoming
CPU-generated packets:
Switch(config)# cpu traffic qos precedence trust
This example shows how to mark the precedence of CPU-generated IP traffic (including IP-SLA and
TWAMP) based on the precedence value in the packet.
The example has these results:
• All CPU generated IP traffic with the precedence value 0 is assigned precedence value 3.
• All CPU generated IP traffic with the precedence values 2, 3 and 4 is assigned precedence value 6.
• All other IP and non-IP traffic is processed by the default configuration.
Maps:
Switch(config)# mls qos
Switch(config)# mls qos map dscp-mutation mapname 0 to 24
Switch(config)# mls qos map dscp-mutation mapname 16 24 32 to 48
CPU QoS:
Switch(config)# cpu traffic qos precedence precedence-mutation mapname
Related Commands Command Description
cpu traffic qos cos Configures the CoS value for CPU-generated traffic.
cpu traffic qos dscp Configures the DSCP value for CPU-generated traffic.
mls qos map Configures a global map to set CoS, DSCP, and precedence values for
CPU-generated traffic.
show cpu traffic qos Displays the QoS marking values configured for CPU-generated traffic.
show mls qos maps Displays information for all global maps.
show running-config Displays the configured global maps and CPU traffic QoS settings.