Applying DSCP and VLAN Match Criteria on a ServiceQueueYou can configure Layer 3 class maps which contain both a Layer 3 Differentiated Services Code Point (DSCP) and IP VLAN IDs as matchcriteria 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-idcommand in class-map input configuration mode. You can include the class map in a policy map, and apply the class and policy map to aservice queue using the service-queue command. In this way, the system applies the match criteria in a class map according to queuepriority (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 matchcriteria. By default, a Layer 3 class map is created if you do not enter the layer2 option with the class-map command. When youcreate a class map, you enter the class-map configuration mode.CONFIGURATION modeDell(conf)#class-map match-all pp_classmap2 Configure a DSCP value as a match criterion.CLASS-MAP modeDell(conf-class-map)#match ipdscp 53 Configure an IP VLAN ID as a match criterion.CLASS-MAP modeDell(conf-class-map)#match ip vlan 54 Create a QoS input policy.CONFIGURATION modeDell(conf)#qos-policy-input pp_qospolicy5 Configure the DSCP value to be set on matched packets.QOS-POLICY-IN modeDell(conf-qos-policy-in)#set ip-dscp 56 Create an input policy map.CONFIGURATION modeDell(conf)#policy-map-input pp_policmap7 Create a service queue to associate the class map and QoS policy map.POLICY-MAP modeDell(conf-policy-map-in)#service-queue 0 class-map pp_classmap qos-policy pp_qospolicy758 Quality of Service (QoS)
