(Virtual Router Redundancy Protocol) A protocol for switching to a backup router in the case of failure. Two or more routers are set up with VRRP, and one is elected the "master." The master router continuously sends advertisement packets to the backups, and if the advertisements stop, one of the backup routers becomes the master. All routers share a "virtual IP" address, so they are all seen as one address. VRRP can also be used for load sharing. See HSRP.