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What is VRRP and what it is being used for?

What is VRRP and what it is being used for? I would like to know the use case. Appreciate any help in this. Thanks!

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Predrag Jovic

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Don Johnston

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beer9

ASKER

Thanks for explaining, I have below details for my interface, and IP 10.4.12.20/32 is being used as VRRP via Keepalived (http://www.keepalived.org/) applications. I would like to understand what is happening here.

oot@localhost:~# ip addr show eth2
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 05:2b:21:2f:f2:65 brd ff:ff:ff:ff:ff:ff
    inet 10.4.12.58/24 brd 10.4.12.255 scope global eth2
    inet 10.4.12.20/32 scope global eth2
    inet6 fe20::27b:22ff:f1cf:7bc5/64 scope link
       valid_lft forever preferred_lft forever

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Don Johnston

It looks like the 10.4.12.20 is the "virtual IP" address for VRRP. This is the IP address that the hosts use as their default gateway.

When a host forwards traffic to that IP address, only the active router will forward it.

Edit: This implementation of VRRP uses "Master" and "Backup" instead of "Active" and "Standby".

Recommend reading the users guide, section V.

beer9

ASKER

Thanks for the explanation. What is the difference of "Master"/"Backup" and "Active"/"Standby".

Don Johnston

Please see my first post.