HSRP is a Cisco proprietary protocol that provides redundancy for IP networks. In the event of a failure, HSRP redirects traffic to a standby router.
HSRP uses a priority system to determine which router should be the active router. The router with the highest priority is elected as the active router. In the event of a failure, the standby router takes over.
The priority can be manually configured or dynamically adjusted based on the state of the router. For example, a router with a higher priority will become the active router if the current active router fails.
HSRP uses a virtual IP address that is shared by the active and standby routers. This IP address is used by hosts to communicate with the router.
In the event of a failure, the standby router takes over and uses the virtual IP address. This failover is transparent to hosts and results in no loss of service.
HSRP is a Cisco proprietary protocol and is not compatible with other brands of routers.
Cisco’s HSRP is a first-class solution for providing router-level redundancy. It is simple to configure and provides a high level of availability.