Configuring Forwarding Policy Options

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Class-of-service (CoS)-based forwarding (CBF) enables you to control next-hop selection based on a packet’s class of service and, in particular, the value of the IP packet's precedence bits.

For example, you might want to specify a particular interface or next hop to carry high-priority traffic while all best-effort traffic takes some other path. When a routing protocol discovers equal-cost paths, it can pick a path at random or load-balance across the paths through either hash selection or round robin. CBF allows path selection based on class.

To configure CBF properties, you can include the following statements at the [edit class-of-service] hierarchy level of the configuration:



[edit class-of-service]

forwarding-policy {



next-hop-map map-name {



forwarding-class class-name {

next-hop [ next-hop-name ];

lsp-next-hop [ lsp-regular-expression ];

non-lsp-next-hop;

discard;
}


}





class class-name {



classification-override {

forwarding-class class-name;
}


}


}

This chapter discusses the following topics:

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