Virtual Router Redundancy Protocol (VRRP):
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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). This increases the availability and reliability of routing paths via automatic default gateway selections on an IP sub-network.
In VRRP, one of the VRRP routing platforms is the master (active) and the others are backups. If the master routing platform fails, one of the backup routing platforms becomes the new master routing platform.
Configuration is given below-
R1:
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conf t
interface fastEthernet 0/0
ip add 192.168.1.1 255.255.255.0
no shut
vrrp 10 ip 192.168.1.1
exit
R2:
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conf t
interface fastEthernet 0/0
ip add 192.168.1.2 255.255.255.0
no shut
vrrp 10 ip 192.168.1.1
exit