Core Issue
Hot Standby Router Protocol (HSRP) provides redundancy for IP networks, ensuring that user traffic immediately and transparently recovers from the first hop router failures. HSRP allows multiple routers on a single LAN to share a virtual IP and MAC address. This address is configured as the default gateway on the hosts.
From the group of routers configured in an HSRP group, the one with the highest priority functions as the active router. The one with the second highest priority functions as the standby router.
In the event of the same priority on multiple routers, the interface IP address is used as the tie breaker. The active router is the one with the highest IP address. The active router assumes the role of forwarding packets sent to the virtual IP address. If the active router fails, the standby router takes over as the new active router.
Resolution
For frequently asked questions about HSRP, refer to Hot Standby Router Protocol (HSRP): Frequently Asked Questions.
