User's Manual

CHAPTER

38-1

Catalyst 3750 Switch Software Configuration Guide

OL-8550-09

Configuring IP Unicast Routing

This chapter describes how to configure IP Version 4 (IPv4) unicast routing on the Catalyst 3750 switch.

Unless otherwise noted, the term switch refers to a standalone switch and a switch stack. A switch stack

operates and appears as a single router to the rest of the routers in the network. Basic routing functions,

including static routing and the Routing Information Protocol (RIP), are available with both the IP base

image and the IP services image. To use advanced routing features and other routing protocols, you must

have the IP services image installed on the standalone switch or on the stack master.

Note If the switch stack is running the IP services image, you can also enable IP Version 6 (IPv6) unicast

routing and configure interfaces to forward IPv6 traffic in addition to IPv4 traffic. For information about

configuring IPv6 on the switch, see Chapter 39, “Configuring IPv6 Unicast Routing.”

For more detailed IP unicast configuration information, see the Cisco IOS IP Configuration Guide,

Release 12.2 from the Cisco.com page under Documentation > Cisco IOS Software > 12.2 Mainline

> Configuration Guides. For complete syntax and usage information for the commands used in this

chapter, see these command references from the Cisco.com page under Documentation > Cisco IOS

Software > 12.2 Mainline > Command References:

• Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2

• Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2

• Cisco IOS IP Command Reference, Volume 3 of 3: Multicast, Release 12.2

This chapter consists of these sections:

• Understanding IP Routing, page 38-2

• Steps for Configuring Routing, page 38-5

• Configuring IP Addressing, page 38-6

• Enabling IP Unicast Routing, page 38-19

• Configuring RIP, page 38-20

• Configuring OSPF, page 38-25

• Configuring EIGRP, page 38-36

• Configuring BGP, page 38-44

• Configuring ISO CLNS Routing, page 38-65

• Configuring Multi-VRF CE, page 38-75