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Dell Configuration Guide for the S4048–ON System 9.14.2.5

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Applying DSCP and VLAN Match Criteria on a Service Queue

You can configure Layer 3 class maps which contain both a Layer 3 Differentiated Services Code Point (DSCP) and IP VLAN IDs as match criteria to filter incoming packets on a service queue on the switch.

To configure a Layer 3 class map to classify traffic according to both an IP VLAN ID and DSCP value, use the match ip vlan vlan-id command in class-map input configuration mode. You can include the class map in a policy map, and apply the class and policy map to a service queue using the service-queue command. In this way, the system applies the match criteria in a class map according to queue priority (queue numbers closer to 0 have a lower priority).

To configure IP VLAN and DSCP match criteria in a Layer 3 class map, and apply the class and policy maps to a service queue:

  1. Create a match-any or a match-all Layer 3 class map, depending on whether you want the packets to meet all or any of the match criteria. By default, a Layer 3 class map is created if you do not enter the layer2 option with the class-map command. When you create a class map, you enter the class-map configuration mode.
    CONFIGURATION mode
    Dell(conf)#class-map match-all pp_classmap
  2. Configure a DSCP value as a match criterion.
    CLASS-MAP mode
    Dell(conf-class-map)#match ipdscp 5
  3. Configure an IP VLAN ID as a match criterion.
    CLASS-MAP mode
    Dell(conf-class-map)#match ip vlan 5
  4. Create a QoS input policy.
    CONFIGURATION mode
    Dell(conf)#qos-policy-input pp_qospolicy
  5. Configure the DSCP value to be set on matched packets.
    QOS-POLICY-IN mode
    Dell(conf-qos-policy-in)#set ip-dscp 5
  6. Create an input policy map.
    CONFIGURATION mode
    Dell(conf)#policy-map-input pp_policmap
  7. Create a service queue to associate the class map and QoS policy map.
    POLICY-MAP mode
    Dell(conf-policy-map-in)#service-queue 0 class-map pp_classmap qos-policy pp_qospolicy

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