Virtual Router Redundancy Protocol (VRRP) is a non-proprietary redundancy protocol, to increase the availability of the default gateway servicing hosts on the same subnet. This increased reliability is achieved by advertising a "virtual router" (an abstract representation of master and backup routers acting as a group) as a default gateway to the host(s) instead of one physical router.

Hi vrrp is virtual router redundancy protocol which is the redundacy path for the defualt routed network path.this isw basically used in ethernet work,MPLS etc. vrrp has mater and slave router the configuration which is on the master is same image dumped on the slave router both interacts with each other by sending hello packets .if the slave doesnot get the hello packets from master then its assumes as master is dead and the salve acts as a master.The master always send the hello packets useing Multicast Ip addressed to 224.0.0.18 .

Hai... VRRP [Virtual router redundancy protocol] helps for gateway redundancy...with out downtime of server and host in the network