[171650] in North American Network Operators' Group
Re: US patent 5473599
daemon@ATHENA.MIT.EDU (Henning Brauer)
Thu May 8 07:09:47 2014
X-Original-To: nanog@nanog.org
Date: Thu, 8 May 2014 13:09:38 +0200
From: Henning Brauer <hb-nanog@bsws.de>
To: nanog@nanog.org
In-Reply-To: <536B63B0.6070706@foobar.org>
Errors-To: nanog-bounces@nanog.org
* Nick Hilliard <nick@foobar.org> [2014-05-08 13:03]:
> On 08/05/2014 11:25, Henning Brauer wrote:
> > you shouldn't see issues but log spam.
> maybe you misunderstand the problem. If you have vrrp and carp on the same
> vlan, using the same vrrp group ID as VHID, then each virtual IP will arp
> for the same mac address on that vlan.
correct.
> This messes up the switch's forwarding table for that particular vlan
> because it sees multiple entries from different ports for the same mac
> address.
correct.
my switches seem to deal with that, wether they have special handling
for that mac addr range or not i dunno.
again, stress the fact that afair we have gotten zero reports about
that "issue" for 10 years, it obviously means that either
1) a vast majority of switches deal with it just fine
2) people know that vhids shouldn't clash and avoid that
--
Henning Brauer, hb@bsws.de, henning@openbsd.org
BS Web Services GmbH, AG Hamburg HRB 128289, http://bsws.de
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