Cisco Systems 3560 사용자 설명서

This chapter describes how to use Hot Standby Router Protocol (HSRP) on the Catalyst 3560 switch to 
provide routing redundancy for routing IP traffic not dependent on the availability of any single router. 
To use HSRP for IPv6, see 

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 

 and see the Getting Started with Cisco Network Assistant, available on 

Cisco.com.

For complete syntax and usage information for the commands used in this chapter, see these documents:

Switch command reference for this release

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

Hot Standby Router Protocol Version 2 feature module at 

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.