This document contains information about configuring and verifying VRRP (Virtual Router Redundancy Protocol) on Cisco routers. It discusses features of VRRP including virtual router groups, priorities, and authentication. Configuration examples are provided to configure VRRP on interfaces and set priorities. Commands to verify VRRP states and track interfaces are also included.

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VRRP
Virtual Router Redundancy Protocol
Feature: -
 Like HSRP, VRRP is a default gateway redundancy method.
 RFC 2338
 Similar in functionality to HSRP
 The virtual router, representing a group of routers, is known as a VRRP group.
 Cisco switches and routers support VRRP on Ethernet, Fast Ethernet, and Gigabit Ethernet interfaces, and on
MPLS VPNs and VLANs.
 The virtual router can use a physical IP address or a virtual IP address.
 VRRP group no range 0 to 255.
 VRRP router priority range from 1 to 254 (100 is the default priority of VRRP router)
 VRRP provides on redundant gateway address from a group of routers. The Active router is called Master router,
even all other router are in backup state. The master router has highest priority in the VRRP group.
 VRRP sends its advertisements to the multicast address 224.0.0.18.
 It using IP protocol 445.
 The advertisement interval timer (default 1 second, hold 3 second)
 Preempt is by default is enable, you can manually disable it.
 It uses two types authentication for advertisement.
Configuration of VRRP

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R1(config)# int s0/0
R1(config-if)#ip address 10.1.1.2 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#int s0/1
R1(config-if)#ip address 11.1.1.2 255.255.255.0
R1(config-if)#no shutdown
R1(config-router)#network 10.1.1.0 0.0.0.255
R1(config-router)#network 11.1.1.0 0.0.0.255
R1(config-router)#no auto-summary
R1(config-router)#network 192.168.102.0
R1(config-router)#exit
R1(config-if)#int f0/0
R1(config-if)#ip address 192.168.102.1 255.255.255.0
R1(config-if)#no sh
R2(config)# int s0/0
R2(config-if)#ip address 10.1.1.1 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#int f0/0
R2(config-if)#ip address 192.168.101.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#router ei 100
R2(config-router)#network 192.168.101.0
R2(config-router)#network 10.1.1.0 255.255.255.0
R2(config-router)#no network 10.1.1.0 255.255.255.0
R2(config-router)#network 10.1.1.0 0.0.0.255
R2(config-router)#no auto-summary
R2(config)#int f0/0
R2(config-if)#vrrp 1 ip 192.168.101.1
*Mar 1 00:45:34.391: %VRRP-6-STATECHANGE: Fa0/0 Grp 1 state Init -> Backup
*Mar 1 00:45:38.003: %VRRP-6-STATECHANGE: Fa0/0 Grp 1 state Backup -> Master
*Mar 1 00:45:34.391: %VRRP-6-STATECHANGE: Fa0/0 Grp 1 state Init -> Backup
As we change priority manually
R2(config-if)#vrrp 1 priority 101
*Mar 1 00:51:36.235: %VRRP-6-STATECHANGE: Fa0/0 Grp 1 state Backup -> Master
Tracking
R2(config)#track 1 interface serial 0/0 line-protocol
R2(config)#int f0/0
R2(config-if)#vrrp 1 track 1
R3(config)# int f0/0
R3(config-if)#ip address 192.168.101.3 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#int s0/0
R3(config-if)#ip address 11.1.1.1 255.255.255.0

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R3(config-if)#no shutdown
R3(config-if)#router ei 100
R3(config-router)#network 192.168.101.0
R3(config-router)#network 11.1.1.0 0.0.0.255
R3(config-router)#no auto-summary
R3(config)#int f0/0
R3(config-if)#vrrp 1 ip 192.168.101.1
*Mar 1 00:47:13.987: %VRRP-6-STATECHANGE: Fa0/0 Grp 1 state Init -> Backup
*Mar 1 00:47:17.599: %VRRP-6-STATECHANGE: Fa0/0 Grp 1 state Backup -> Master
Note: - first we implement VRRP, In VRRP which has highest router id it will become Master.
*Mar 1 00:51:35.711: %VRRP-6-STATECHANGE: Fa0/0 Grp 1 state Master -> Backup
Tacking
R3(config)#track 1 interface serial 0/0 line-protocol
R3(config)#interface f0/0
R3(config-if)#vrrp 1 track 1
Verifying Command: -
R2#sh vrrp
FastEthernet0/0 - Group 1
State is Master
Virtual IP address is 192.168.101.1
Virtual MAC address is 0000.5e00.0101
Advertisement interval is 1.000 sec
Preemption enabled
Priority is 101
Track object 1 state Up decrement 10
Master Router is 192.168.101.2 (local), priority is 101
Master Advertisement interval is 1.000 sec
Master Down interval is 3.605 sec
R3# sh vrrp
FastEthernet0/0 - Group 1
State is Backup
Virtual IP address is 192.168.101.1
Virtual MAC address is 0000.5e00.0101
Advertisement interval is 1.000 sec
Preemption enabled
Priority is 100
Track object 1 state Up decrement 10
Master Router is 192.168.101.2, priority is 101
Master Advertisement interval is 1.000 sec

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Master Down interval is 3.609 sec (expires in 2.761 sec)
R2#sh vrrp brief
Interface Grp Pri Time Own Pre State Master addr Group addr
Fa0/0 1 101 3605 Y Master 192.168.101.2 192.168.101.1
R3#sh vrrp brief
Interface Grp Pri Time Own Pre State Master addr Group addr
Fa0/0 1 100 3609 Y Backup 192.168.101.2 192.168.101.1