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Overriding the Input Classification

For IPv4 or IPv6 packets, you can override the incoming classification, assigning them to the same forwarding class based on their input interface, input precedence bits, or destination address. You do so by defining a policy class when configuring CoS properties and referencing this class when configuring a routing policy.

When you override the classification of incoming packets, any mappings you configured for associated precedence bits or incoming interfaces to output transmission queues are ignored. Also, if the packet loss priority (PLP) bit was set in the packet by the incoming interface, the PLP bit is cleared.

To override the input packet classification, do the following:

  1. Define the policy class by including the class statement at the [edit class-of-service forwarding-policy] hierarchy level:

    class-name is a name that identifies the routing policy class.

  2. Associate the policy class with a routing policy by including it in a policy-statement statement at the [edit policy-options] hierarchy level. Specify the destination prefixes in the route-filter statement and the CoS policy class name in the then statement.

  3. Apply the policy by including the export statement at the [edit routing-options] hierarchy level: