Redundancy Protocols – Part 4 (VRRP) - :
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VRRP(Virtual Router Redundancy Protocol)

VRRP(Virtual Router Redundancy Protocol) is a standard based redundancy protocol. The configuration of this protocol is like HSRP with only small differences.

In VRRP the active router is called Master, and the remainning ones are all Backup routers. So there can be multiple backup routers.

redundancy protocols VRRP (Virtual Router Redundancy Protocol), protocols for redundancy

VRRP (Virtual Router Redundancy Protocol)

By default the virtual MAC address is 0000.5e00.01xx, and xx specifies the h hexadecimal group number.

One important difference is hello time. This time is 1 second in VRRP by default. And this hellos send to the multicast address

In VRRP, preempt feature is enabled by default. If you want to disable it you can use “no vrrp 1 enable” for example. And VRRP do not have track option. You can not use this feature to decrease the priorit values as in HSRP.

VRRP Configuration Example on Cisco IOS

As I mentioned above, configuring VRRP is like configuring HSRP. There are only small differences.

Router A (config)# int fa0/10
Router A (config-if)# no switchport
Router A (config-if)# ip address
Router A (config-if)# vrrp 1 priority 75
Router A (config-if)# vrrp 1 authentication CISCO
Router A (config-if)# vrrp 1 ip

Yes it is like this! Only “standby” word is leaving us. Instead “vrrp” is coming.

To verify the VRRP configuration use the “show vrrp brief all” command.

Redundancy Protocols – Part 1
Redundancy Protocols – Part 2 (HSRP)
Redundancy Protocols – Part 3 (HSRP Configuration)
Redundancy Protocols – Part 5 (GLBP)

About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

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