Describes how to implement the Hot Standby Router Protocol (HSRP) to provide transparent failover at the first-hop IP router by allowing a group of routers to act as a single virtual router.
HSRP
This topic describes the Hot Standby Router Protocol (HSRP), an IP routing redundancy protocol that provides transparent failover at the first-hop IP router by allowing a group of routers to select an active and a standby router.
Preemption
This topic describes the HSRP preemption feature, which enables the router with the highest priority to immediately become the active router.
ICMP redirect messages
This topic describes how ICMP redirect messages are filtered through HSRP so that the next-hop IP address is changed to an HSRP virtual IP address, preventing hosts from discovering the real MAC addresses of routers in the HSRP group.
HSRP over BVI
This topic describes how HSRP runs over Bridge-Group Virtual Interfaces (BVIs) to provide default gateway redundancy for a LAN, including supported scale, topology, and systems.
HSRP over physical and bundle interfaces
This topic describes HSRP support for IPv4 and IPv6 networks on physical interfaces, physical sub-interfaces, bundle interfaces, and bundle sub-interfaces, including supported scale and topology.