Chapter 31 Configuring Hsrp; Understanding Hsrp - Cisco WS-C3560-48PS-S Software Configuration Manual

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Configuring HSRP

This chapter describes how to use Hot Standby Router Protocol (HSRP) on the Catalyst 3560 switch to

provide routing redundancy for routing IP traffic without being dependent on the availability of any

single router. You can also use a version of HSRP in Layer 2 mode to configure a redundant command

switch to take over cluster management if the cluster command switch fails. For more information about

clustering, see

For complete syntax and usage information for the commands used in this chapter, refer to the switch

command reference for this release and the Cisco IOS IP and IP Routing Command Reference for

Release 12.1.

This chapter consists of these sections:

HSRP is Cisco's standard method of providing high network availability by providing first-hop

redundancy for IP hosts on an IEEE 802 LAN configured with a default gateway IP address. HSRP routes

IP traffic without relying on the availability of any single router. It enables a set of router interfaces to

work together to present the appearance of a single virtual router or default gateway to the hosts on a

LAN. When HSRP is configured on a network or segment, it provides a virtual Media Access Control

(MAC) address and an IP address that is shared among a group of configured routers. HSRP allows two

or more HSRP-configured routers to use the MAC address and IP network address of a virtual router.

The virtual router does not exist; it represents the common target for routers that are configured to

provide backup to each other. One of the routers is selected to be the active router and another to be the

standby router, which assumes control of the group MAC address and IP address should the designated

active router fail.

Routers in an HSRP group can be any router interface that supports HSRP, including Catalyst 3560

routed ports and switch virtual interfaces (SVIs).

Chapter 5, "Clustering Switches."

Understanding HSRP, page 31-1

Configuring HSRP, page 31-3

Displaying HSRP Configurations, page 31-10

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Catalyst 3560 Switch Software Configuration Guide

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