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Configuring CoS Rewrite Rules (CLI Procedure)
You configure rewrite rules to alter CoS values in outgoing packets on the outbound interfaces of a switch to match the policies of a targeted peer. Policy matching allows the downstream router in a neighboring network to classify each packet into the appropriate service group.
In addition, you often need to rewrite a given marker such as IP precedence, DSCP, or IEEE 802.1p at the switch's inbound interfaces to accommodate behavior aggregate (BA) classification by core devices.
You do not need to explicitly apply rewrite rules to interfaces. By default, rewrite rules are applied to routed packets.
To configure CoS rewrite rules, associate the rewrite rule (customup-rw) with forwarding class, loss priority, and code-point:
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
be loss-priority low code-point 000
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
be loss-priority high code-point 001
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
af loss-priority low code-point 010
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
af loss-priority high code-point 011
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
ef loss-priority low code-point 100
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
ef loss-priority high code-point 101
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
nc loss-priority low code-point 110
[edit class-of-service rewrite-rules]
user@switch# set ieee-802.1 customup-rw forwarding-class
nc loss-priority high code-point 111