Configuring HSRP

How to use Hot Standby Router Protocol (HSRP) on the Catalyst 3750X switch to provide routing redundancy for routing IP traffic not dependent on the availability of any single router. HSRP for IPv4 is supported on switches running the IP base or IP services image. To use HSRP for IPv6, see Chapter 39, "Configuring IPv6 Unicast Routing."

Routers in an HSRP group can be any router interface that supports HSRP, including Catalyst 3750 routed ports and switch virtual interfaces (SVIs).

When a device is participating in an HSRP standby routing and clustering is enabled, you can use the same standby group for command switch redundancy and HSRP redundancy. Use the cluster standby-group HSRP-group-name [routing-redundancy] global configuration command to enable the same HSRP standby group to be used for command switch and routing redundancy. If you create a cluster with the same HSRP standby group name without entering the routing-redundancy keyword, HSRP standby routing is disabled for the group.

This example shows how to bind standby group my_hsrp to the cluster and enable the same HSRP group to be used for command switch redundancy and router redundancy. The command can only be executed on the cluster command switch. If the standby group name or number does not exist, or if the switch is a cluster member switch, an error message appears.

 Switch# configure terminal

 Switch(config)# cluster standby-group my_hsrp routing-redundancy

 Switch(config)# end