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

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Setting DSCP Values for Egress Packets Based on Flow

Match-any Layer 3 flows may have several match criteria. All flows that match at least one of the match criteria are mapped to the same queue because they are in the same class map.

Setting a DSCP value from QOS-POLICY-IN mode (refer to Setting a DSCP Value for Egress Packets ) assigns the same DSCP value to all of the matching flows in the class-map.

The flow-based DSCP marking feature allows you to assign different DSCP to each match criteria.

Create matching flows within a class map that have different DSCP values. CLASS MAP mode match set-ip-dscp The values you set from CLASS-MAP mode override the value you set in the QoS input policy DSCP value. Packets matching the rule are marked with the specified value.

Example of Marking Flows in the Same Queue with Different DSCP Values 

Dell#show run class-map
                                 !
                                 class-map match-any example-flowbased-dscp
                                 match ip access-group test set-ip-dscp 2
                                 match ip access-group test1 set-ip-dscp 4
                                 match ip precedence 7 set-ip-dscp 1
                                 
                                 Dell#show run qos-policy-input
                                 !
                                 qos-policy-input flowbased
                                 set ip-dscp 3

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