US patent 5473599

Henning Brauer hb-nanog at bsws.de
Thu May 8 11:09:38 UTC 2014


* Nick Hilliard <nick at 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 at bsws.de, henning at openbsd.org
BS Web Services GmbH, AG Hamburg HRB 128289, http://bsws.de
Full-Service ISP - Secure Hosting, Mail and DNS Services
Dedicated Servers, Rootservers, VMs/PVS, Application Hosting


More information about the NANOG mailing list