Cisco WS-CBS3032-DEL Software Configuration Manual page 884

Configuring Standard QoS
A separate policy-map class can exist for each type of traffic received on the SVI.
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If you configure the IP-precedence-to-DSCP map by using the mls qos map ip-prec-dscp
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dscp1...dscp8 global configuration command, the settings only affect packets on ingress interfaces
that are configured to trust the IP precedence value. In a policy map, if you set the packet IP
precedence value to a new value by using the set ip precedence new-precedence policy-map class
configuration command, the egress DSCP value is not affected by the IP-precedence-to-DSCP map.
If you want the egress DSCP value to be different than the ingress value, use the set dscp new-dscp
policy-map class configuration command.
If you enter or have used the set ip dscp command, the switch changes this command to set dscp in
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its configuration. If you enter the set ip dscp command, this setting appears as set dscp in the switch
configuration.
• You can use the set ip precedence or the set precedence policy-map class configuration command
to change the packet IP precedence value. This setting appears as set ip precedence in the switch
configuration.
If VLAN-based QoS is enabled, the hierarchical policy map supersedes the previously configured
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port-based policy map.
The hierarchical policy map is attached to the SVI and affects all traffic in the VLAN. The actions
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specified in the VLAN-level policy map affect the traffic belonging to the SVI. The police action on
the port-level policy map affects the ingress traffic on the affected physical interfaces.
When configuring a hierarchical policy map on trunk ports, the VLAN ranges must not overlap. If
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the ranges overlap, the actions specified in the policy map affect the incoming and outgoing traffic
on the overlapped VLANs.
Aggregate policers are not supported in hierarchical policy maps.
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• When VLAN-based QoS is enabled, the switch supports VLAN-based features, such as the VLAN
map.
You can configure a hierarchical policy map only on the primary VLAN of a private VLAN.
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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
37-64
Chapter 37 Configuring QoS
OL-13270-06