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VRRP
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14.4.2. VRRP version 3
VRRP version 3 works in much the same way, but allows the advertisement interval to be any multiple of 10ms
(1/100th of a second). The default interval is still 1 second, but it can now be set much faster - so although the
timeout is still 3 times the interval, this means the backup could take over in as little as 30ms.
VRRP3 also works with IPv6. Whilst IPv4 and IPv6 VRRP are completely independent, you can configure
both at once in a single
vrrp
object by listing one or more IPv4 addresses and one or more IPv6 addresses.
VRRP3 is used by default for any IPv6 addresses or where an interval of below one second is selected. It can
also be specifically set in the config by setting the attribute
version3
to the value
"true"
.
Caution
If you have devices that are meant to work together as VRRP but one is version 2 and one is version 3
then they will typically not see each other and both become master. The FB6000's VRRP Status page
shows if VRRP2 or VRRP3 is in use, and whether the FireBrick is master or not.
14.5. Compatibility
VRRP2 and VRRP3 are standard protocols and so the FB6000 can work alongside other devices that support
VRRP2 or VRRP3.
Note that the FB6000 has non-standard support for some specific packets sent to the VRRP virtual addresses.
This includes answering pings (configurable) and handling DNS traffic. Other VRRP devices may not operate
in the same way and so may not work in the same way if they take over from the FireBrick.
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