The design goal of the hot spare router protocol (HSRP) is to support specific cases of IP traffic failover does not cause confusion, and allow hosts to use single routers, and even if the actual first hop router can maintain the router. Connectivity. In other words, when the source host cannot dynamically know the IP address of the first hop router, the HSRP protocol protects the first hop router does not fail. The protocol contains a variety of routers, corresponding to a virtual router. The HSRP protocol only supports a router representing a virtual router to implement packet forwarding processes. The terminal host forwards their respective packets to the virtual router.
The router responsible for forwarding the packet is called an active router. Once the active router fails, HSRP will activate the backup router (Standby Routers) replacing the active router. The HSRP protocol provides a mechanism for deciding to use active routers or backup routers, and specify a virtual IP address as the default gateway address of the network system. If the active router fails, the backup router will undertake all the tasks of the active router, and will not cause the host to connect the interrupt.
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