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CISCO TUTORIAL - VRRP (VIRTUAL ROUTER REDUNDANCY PROTOCOL)

VRRP (VIRTUAL ROUTER REDUNDANCY PROTOCOL)- is an Internet protocol that provides a way to have one or more backup routers when using a statically configured router on a local area network (LAN). The most common arrangement is to specify one router to serve as the router for forwarding packets from a group of hosts on a LAN. If that router fails, however, there is no way to use another router as a backup. Using VRRP, a virtual IP address can be specified manually or with Dynamic Host Configuration Protocol (DHCP) as a default. A virtual IP address is shared among the routers, with one designated as the master router and the others as backups. In case the master fails, the virtual IP address is mapped to a backup router's IP address. (This backup becomes the master router.) VRRP can also be used for load balancing. VRRP is part of both IPv4 (the version of IP that most networks currently use) and IPv6.