![]() ![]() If more than two Routers participate in a HSRP group the remaining Routers will be in Listen State. If there are any Routers in speak state they will compete to be the new standby Router. If the active Router fails the standby Router becomes the Virtual Router by serving the virtual MAC-address and IP Address. The Virtual Router is a MAC-address and a IP Address the active Router serves beside its configured IP address. Packets are sent to multicast address 224.0.0.2 with TTL 1. HSRP runs on top of UDP, and uses port number 1985. HSRP works by two or more Routers agreeing upon which Router serves the virtual Router. VRRP Virtual Router Redundancy Protocol.There can more routers in Listen state waiting to be standby Router.The purpose of HSRP is to ensure network connectivity in case of Router or access circuit failure, by having one standby Router waiting to take over from the failing active Router. HSRP or Hot Standby Router Protocol is a protocol defined by Cisco and now described in rfc2281.
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