CARP vhid: across interfaces?

[Freddie Cash]

That is the correct sysctl. If any CARP-controlled interface goes down,
then all CARP-interfaces ate failed. That's the setup you want. It's the
one we use on two pairs of CARP-using routers, and it works wonderfully.

Cheers,
Freddie
On Jan 1, 2015 3:29 AM, "Aristedes Maniatis" <ari at ish.com.au> wrote:

> On 1/01/2015 10:22pm, Freddie Cash wrote:
> > There's a sysctl specifically for this. Not at my computer right now,
> but the following should make it jump out at you:
> >
> > # sysctl -d | grep carp
>
> I'm guessing this one (from the openBSD docs)...
>
> net.inet.carp.preempt
>     Allow hosts within a redundancy group that have a better advbase and
> advskew to preempt the master. In addition, this option also enables
> failing over a group of interfaces together in the event that one interface
> goes down. If one physical CARP-enabled interface goes down, CARP will
> increase the demotion counter, carpdemote, by 1 on interface groups that
> the carp(4) interface is a member of, in effect causing all group members
> to fail-over together. net.inet.carp.preempt is 0 (disabled) by default.
>
>
> But the FreeBSD man page doesn't talk about carpdemote
>
> net.inet.carp.preempt              Allow virtual hosts to preempt each
>                                            other.  When enabled, a vhid in
> a
>                                            backup state would preempt a
> master
>                                            that is announcing itself with a
>                                            lower advskew.  Disabled by
>                                            default.
>
>
>
> At any rate what does "interface groups that the carp(4) interface is a
> member of" mean?
>
>
>
> Freddie, thanks for pointing me to this setting. Maybe the answer is in
> the somewhere.
>
> Ari
>
>
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