Chapter 29 Configuring Hsrp; Understanding Hsrp - Cisco Catalyst 3750 Software Configuration Manual

Metro switch

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Configuring HSRP

This chapter describes how to use Hot Standby Router Protocol (HSRP) on the Catalyst 3750 Metro

switch to provide routing redundancy for routing IP traffic without being dependent on the availability

of any single router.

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 3750 Metro switch routed ports and switch virtual interfaces (SVIs).

HSRP provides high network availability by providing redundancy for IP traffic from hosts on networks.

In a group of router interfaces, the active router is the router of choice for routing packets; the standby

router is the router that takes over the routing duties when an active router fails or when preset conditions

Understanding HSRP, page 29-1

Configuring HSRP, page 29-3

Displaying HSRP Configurations, page 29-10

C H A P T E R

Catalyst 3750 Metro Switch Software Configuration Guide

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