Virtual Router Redundancy Protocol “VRRP”

 

When switches are configured to act as a VRRP group, they will work together to present the illusion of a single default gateway to the hosts on the LAN. In the event that the switch that is the Master VRRP router fails, the hosts on the LAN will remain unaware that a device has failed because the Backup VRRP router with transition to the Master state and assume the duty of providing the default gateway to the host.

A group number is required in order for VRRP to be configured

VRRP group numbers must be within a range of 1 to 255 Priorities should be configured to guarantee that a specific switch becomes the Master in a VRRP group. The other switches in the group are Backup virtual routers. If the Master virtual router fails, the Backup virtual router with the highest priority will assume the role of the Master virtual router

Configuration example

(config)#interface vlan x
(config-if)#vrrp “group#” ip x.x.x.x
(config-if)#vrrp (x ) priority x ( 0 – 254 )
(config-if)#vrrp preempt

Authentification :
(config-if)#vrrp authentification ( md5 or txt )

Verifying vrrp:

Show vrrp

Leave a Comment