Re: trunk(4) failover

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02-26-2008, 02:31 AM

Henning Brauer

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Re: trunk(4) failover

* Stuart Henderson <stu@spacehopper.org> [2008-02-25 22:58]:
> there's a current thread on misc@ from somone with a switch that
> doesn't pick up quickly when a failover trunk(4) fails over.
>
> I just had a look at this and noticed that there's nothing sent
> when this happens, the only way to notice that a machine using
> has switched to another port is if it transmits a packet, or
> if the fdb/mac cache times out - with certain bridges there
> can be quite a delay for this to happen.
>
> I thought that registering a callback with if_linkstatehooks
> and having that send gratuitous ARP, a la carp_send_arp(), might
> be a useful thing to do, but I'm a bit unsure if that's something
> a layer2-like device should be doing, is there anyone who'd like
> to comment?

if we wanna do trunks with switches that know nothing about it (i. e.
no lacp), we kind of have to.

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Henning Brauer, hb@bsws.de, henning@openbsd.org
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Re: trunk(4) failover