To Know VRRP Basic Configuration

December 20 2012 , Written by Cisco & Cisco Router, Network Switch Published on #Cisco & Cisco Network

Here we will go over a basic VRRP (Virtual Router Redundancy Protocol) configuration. VRRP is very similar to the other two, HSRP and GLBP. However it is not a Cisco proprietary protocol, it is standards based. Also, it, unlike GLBP, does not provide load balancing. It is more similar to HSRP instead.

Let’s take a look at the following sample topology:

As in the previous two articles, Router-A and Router-B are adjacent to the LAN segment. Asside from the normal IP address on our router interfaces, you will see a few VRRP commands added in the following configs:

Router-A:

interface FastEthernet0/0

ip address 10.0.254.20 255.255.255.0

vrrp 1 priority 120

vrrp 1 timers learn

vrrp 1 ip 10.0.254.10

Router-B:

interface FastEthernet0/0

ip address 10.0.254.20 255.255.255.0

vrrp 1 priority 100

vrrp 1 timers learn

vrrp 1 ip 10.0.254.10

The higher priority of Router-A’s VRRP config tells it to be the active router. And, the ‘timers learn’ command, as it implies, tells the vrrp process to learn the timers of the other member(s). This is good to do in case the other router has a different interval set.

You should now be able to ping .10 on your LAN segment. Should you wish to connect to a specific router, you can use the normal interface IP that was configured.

We can verify the VRRP operation via the ‘show vrrp all’ command:

Router-A#show vrrp all

FastEthernet0/0 - Group 1

State is Master

Virtual IP address is 10.0.254.10

Virtual MAC address is 0000.5e00.0101

Advertisement interval is 1.000 sec

Preemption enabled

Priority is 120

Master Router is 10.0.254.20 (local), priority is 120

Master Advertisement interval is 1.000 sec

Master Down interval is 3.531 sec