Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 568

www.dell.com | support.dell.com Set DSCP values for egress packets based on flow Match-any Layer 3 flows may have several match criteria. All flows that that match at least one of the match criteria are mapped to the same queue since they are in the same class map. Setting a DSCP value from QOS-POLICY-IN mode (see Set a DSCP value for egress packets on page 570) 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 CLASS-MAP mode using the option set-ip-dscp with the match command so that matching flows within a class map can have different DSCP values, as shown in Figure 31-11. The values you set from CLASS-MAP mode override the value you QoS input policy DSCP value, and packets matching the rule are marked with the specified value. Figure 31-11. Marking Flows in the Same Queue with Different DSCP Values Force10#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 Force10#show run qos-policy-input ! qos-policy-input flowbased set ip-dscp 3 Force10# show cam layer3 linecard 2 port-set 0 Cam Port Dscp Proto Tcp Src Dst SrcIp DstIp DSCP Queue Index Flag Port Port Marking 16260 1 0 TCP 0x0 0 0 1.1.1.0/24 0.0.0.0/0 2 0 16261 1 0 UDP 0x0 0 0 2.2.2.2/32 0.0.0.0/0 4 0 16262 1 56 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 1 0 24451 1 0 0 0x0 0 0 0.0.0.0/0 0.0.0.0/0 - 0 Display configured class maps and match criteria Display all class-maps or a specific class map using the command show qos class-map from EXEC Privilege mode. 568 | Quality of Service