Cisco IOS Cookbook, 2nd Edition

VRRP

Problem

You want to implement VRRP on your Cisco router.

Solution

To configure Router1 to be the Master VRRP router, use the following set of commands and assign a higher priority level:

Router1#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#interface FastEthernet0/1
Router1(config-if)#ip address 10.1.1.2 255.255.255.0
Router1(config-if)#vrrp 1 ip 10.1.1.1
Router1(config-if)#vrrp 1 preempt
Router1(config-if)#vrrp 1 priority 200
Router1(config-if)#end
Router1#

The configuration of the Backup VRRP router is identical, except the priority is set to a lower level:

Router2#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router2(config)#interface FastEthernet0/0
Router2(config-if)#ip address 10.1.1.3 255.255.255.0
Router2(config-if)#vrrp 1 ip 10.1.1.1
Router2(config-if)#vrrp 1 preempt
Router2(config-if)#vrrp 1 priority 150
Router2(config-if)#end
Router2#

Discussion

The VRRP configuration commands are very similar to the HSRP commands, which makes configuring VRRP quite easy if you’re already familiar with HSRP. One noticeable difference is that the VRRP group numbers range from 1 to 255, instead of 0 to 255 (or 0 to 4,095 for HSRP Version 2), and you must supply a group number.

Another interesting difference is the way you modify the timers for VRRP. You are only allowed to modify the hello timer. The hold timer is calculated automatically:

Router1(config-if)#vrrp 1 timers advertise 2

By default, the hello timer ...