CHAPTER 20
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:
•
Routing Policies, page 271
•
Static Routing, page 273
•
OSPF Routing, page 274
•
OSPFv3 Routing, page 277
•
Equal Cost Multiple Path (ECMP), page 278
•
BGP-4 Routing, page 279
•
Bidirectional Forwarding Detection, page 286
•
Viewing Routing Information, page 296
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
on a range of IP addresses.
• IP Prefix Lists – A more advanced element of a routing policy. An IP Prefix list filters routes based on
IP prefixes.
• AS Path Access Lists – A basic building block used for Border Gateway Protocol (BGP) routing. These
lists filter Autonomous System (AS) paths.
• Route Maps – Route-maps provide detailed control over routes during route selection or route
advertisement by a routing protocol, and in route redistribution between routing protocols. For this level
ASR 5500 System Administration Guide, StarOS Release 21.4
271
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