Chapter 2 0 Routing; Routing Policies - Cisco ASR 5500 System Administration Manual

Routing
This chapter provides information on configuring an enhanced, or extended, service. The product
administration guides provide examples and procedures for configuring basic services on the system. You
should select the configuration example that best meets your service model, and configure the required
elements for that model before using the procedures described below.
This chapter includes the following sections:
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Routing Policies

This section describes how to configure the elements needed to define routing policies. Routing policies
modify and redirect routes to and from the system to satisfy specific network deployment requirements.
Use the following building blocks to configure routing policies:
• Route Access Lists – The basic building block of a routing policy. Route access lists filter routes based
• IP Prefix Lists – A more advanced element of a routing policy. An IP Prefix list filters routes based on
• AS Path Access Lists – A basic building block used for Border Gateway Protocol (BGP) routing. These
• Route Maps – Route-maps provide detailed control over routes during route selection or route
Routing Policies, page 207
Static Routing, page 209
OSPF Routing, page 210
OSPFv3 Routing, page 213
Equal Cost Multiple Path (ECMP), page 214
BGP-4 Routing, page 215
Bidirectional Forwarding Detection, page 222
Viewing Routing Information, page 232
on a range of IP addresses.
IP prefixes.
lists filter Autonomous System (AS) paths.
advertisement by a routing protocol, and in route redistribution between routing protocols. For this level
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