[c-nsp] MAC addresses unlearned with HSRP

[Gert Doering]

Hi,

On Wed, Jun 07, 2006 at 06:40:30PM +0200, Vincent De Keyzer wrote:
> Problem with this set-up is that R2 might very well send out packets for the
> H via S2, which at some point will have timed out the MAC address of H, and
> will hence have to flood all of its ports (like a good switch is supposed to
> do). This will result in increased and useless traffic on the ports of S2.

Have H send out broadcast packets once per minute - like "rwhod" on
Unix/Linux systems.  

Windoze systems tend to send out broadcasts all the time anyway.

(We've been into that problem before, and this is how we solved it).

[..]
> One solution to this would be that R2 would not see that "connected" IP
> route anymore, because it is HSRP standby. This idea has been discussed
> often on this list but it does not seem that Cisco has any plans to
> implement that.

Indeed that solution would also work out well (and fix a few other problems
in typical HSRP setups as well).

gert
-- 
USENET is *not* the non-clickable part of WWW!
                                                           //www.muc.de/~gert/
Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de