CHAPTER 11
Implementing Routing Policy
A routing policy instructs the router to inspect routes, filter them, and potentially modify their attributes as
they are accepted from a peer, advertised to a peer, or redistributed from one routing protocol to another.
This module describes how routing protocols make decisions to advertise, aggregate, discard, distribute,
export, hold, import, redistribute and modify the routes based on configured routing policy.
The routing policy language (RPL) provides a single, straightforward language in which all routing policy
needs can be expressed. RPL was designed to support large-scale routing configurations. It greatly reduces
the redundancy inherent in previous routing policy configuration methods. RPL streamlines the routing policy
configuration, reduces system resources required to store and process these configurations, and simplifies
troubleshooting.
For more information about routing policy on the Cisco IOS XR software and complete descriptions of the
routing policy commands listed in this module, see the Related Documents, on page 464 section of this module.
To locate documentation for other commands that might appear while performing a configuration task, search
online in the .
Note
Feature History for Implementing Routing Policy
This feature was introduced.Release
5.0.0
• Prerequisites for Implementing Routing Policy, on page 381
• Restrictions for Implementing Routing Policy, on page 382
• Information About Implementing Routing Policy, on page 382
• How to Implement Routing Policy, on page 453
• Configuration Examples for Implementing Routing Policy, on page 457
• Additional References, on page 464
Prerequisites for Implementing Routing Policy
The following are prerequisites for implementing Routing Policy on Cisco IOS XR Software:
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
381
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