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ROUTING POLICY CONFIGURATION
n
The term “router” refers to a router in a generic sense or a Layer 3 switch running
routing protocols.
A routing policy is used on a router for route inspection, filtering, attributes
modification when routes are received, advertised, or redistributed.
When configuring routing policy, go to these sections for information you are
interested in:
■ “Introduction to Routing Policy” on page 415
■ “Routing Policy Configuration Task List” on page 417
■ “Defining Filtering Lists” on page 417
■ “Configuring a Routing Policy” on page 419
■ “Displaying and Maintaining the Routing Policy” on page 422
■ “Routing Policy Configuration Example” on page 422
■ “Troubleshooting Routing Policy Configuration” on page 425
n
Routing policy described in this chapter includes both IPv4 routing policy and IPv6
routing policy. Configurations of the two are similar, and differences are described
in related sections.
Introduction to
Routing Policy
Routing Policy and
Policy Routing
A routing policy is used on the router for route inspection, filtering, attributes
modifying when routes are received, advertised, or redistributed.
Policy routing is a routing mechanism based on the user-defined policies.
This chapter describes only routing policy configuration and usage, refer to “Static
Routing Configuration” on page 251 for policy routing information.
When distributing or receiving routing information, a router can use a routing
policy to filter routing information. For example, a router receives or advertises
only routing information that matches the criteria of a routing policy; a routing
protocol redistributes routes from another protocol only routes matching the
criteria of a routing policy and modifies some attributes of these routes to satisfy
its needs using the routing policy.
To implement a routing policy, you need to define a set of match criteria according
to attributes in routing information, such as destination address, advertising
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