CHAPTER
29-1
Catalyst 3750 MetroSwitch Software Configuration Guide
78-15870-01
29
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.
Note 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:
• Understanding HSRP, page 29-1
• Configuring HSRP, page 29-3
• Displaying HSRP Configurations, page 29-10
Understanding HSRP
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.
Note 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
are met.
To Next Page
Loading...
Need help?
General
