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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Classifying Packets Based on a Combination of DSCP Code Points and VLAN IDs

You can configure a classifier map, which contains both the Differentiated Services Code Point (DSCP) and MAC VLAN IDs as parameters, for filtering packets that are received before they are forwarded or dropped. You can now specify both DSCP-IP packet classification (Layer 3 headers) and Dot1p—(IEEE 802.1p) Packet classification (Layer 2 headers) as match criteria in a Layer 3 class map.

The type of the class map is determined during the creation of a class map. In releases of Dell Networking OS earlier than Release 9.2(0.0), you can configure only the dot1p value as the filter criterion in Layer 2 class maps and the DSCP value as the filter parameter in Layer 3 class maps. It was also possible to classify packets using both the Layer 2 attribute, dot1p value or MAC VLAN, in a Layer 2 class map and the Layer 3 attribute, DSCP value, in a Layer 3 class map. However, it was not possible to configure both dot1p or MAC VLAN, and DSCP values in the same Layer 2 or Layer 3 class map.

All class maps are Layer 3 by default. You can now configure a Layer 3 class map to differentiate traffic according to the IP VLAN value and the DSCP value. You can use the match ip vlan vlan-id command in Class Map Input Configuration mode to specify a match criterion for a class map based on a VLAN ID. You can attach this class map with a policy map, and associate the policy map with a service queue. When you link class maps to queues using the service-queue command, Dell Networking OS matches the class-maps according to queue priority (queue numbers closer to 0 have lower priorities).

To create IP VLAN and DSCP values as match criteria in a Layer 3 class map, and to associate the class map with a policy map that is linked to a service queue, perform the following:

  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 to be a member of the class. 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. Use a DSCP value as a match criterion. CLASS-MAP mode Dell (conf-class-map)#match ip dscp 5
  3. Configure a match criterion for a class map based on the VLAN ID. CLASS-MAP mode Dell (conf-class-map)#match ip vlan 5
  4. Create a QoS input policy on the device. CONFIGURATION mode Dell(conf)#qos-policy-input pp_qospolicy
  5. Specify the DSCP value to be set on the matched traffic. 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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