Egress DSCP reclassification

In many core networks, the number of different per-hop behaviors (forwarding class and profile combinations) can be limited by the need for a common denominator of per-hop behaviors among the different aggregation networks that the core network interconnects. To restore per-hop-behavior with finer granularity at the exit from the core network to an aggregation network, 7730 SXR platforms support egress DSCP reclassification.

The DSCP reclassification policy maps a DSCP value to a forwarding class and profile. The policy can be assigned to any type of subinterface (Layer 2 or Layer 3).

By default, no DSCP reclassification policy is assigned to a subinterface.

--{ + candidate shared default }--[ ]--
# info qos classifiers dscp-reclassify-policy reclassify-policy-name dscp AF11
    qos {
        classifiers {
            dscp-reclassify-policy reclassify-policy-name {
                dscp AF11 {
                    forwarding-class fc0
                    profile out
                }
            }
        }
    }

--{ + candidate shared default }--[  ]--
# info qos interfaces interface ethernet-1/2.1 output dscp-reclassify-policy
    qos {
        interfaces {
            interface ethernet-1/2.1 {
                output {
                    dscp-reclassify-policy reclassify-policy-name
                }
            }
        }
    }