Forwarding Policy Options Overview

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, include the following statements at the [edit class-of-service] hierarchy level:

[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;}}}