[c-nsp] standby use-bia?

[Rodney Dunn]

His subject line daid "use-bia" but I don't see it
mentioned in the email anywhere.

Couldn't he just use that rather than making
up a mac address for the group?

I've seen that done many times before to get around
this issue.

Rodney


On Thu, Dec 02, 2004 at 08:58:41AM +0100, Oliver Boehmer oboehmer" wrote:
> 
> 
> > We ran into an issue recently where an HSRP switchover happened and a
> > bunch of our L3 switches either didn't get or didn't act on the
> > gratuitous arp the active router is supposed to send when it's
> > configured with use-bia and goes active.  This got me thinking about
> > ways around having the HSRP group members having different MAC
> > addresses. 
> > 
> > The limitation we have is that the VIP2s in our 7500s only have a 32
> > addr AF.  What's the limit on VIP4?  I haven't been able to find that
> > anywhere? 
> 
> Ack, this limit also applies to the VIP4.
>  
> > While looking into this, I noticed that there is "standby [group #]
> > mac-addr xxxx.xxxx.xxxx" command.  Assuming an FE or Portchannel has
> > lots of subinterfaces, each of which is doing HSRP with one or more
> > other routers, but there's only one HSRP group per VLAN, is there any
> > reason I can't use "standby [group #] mac-addr" to make all the HSRP
> > virtual MAC addresses the same?...using either a made up MAC address
> > or perhaps an actual MAC address from one of the routers, and use
> > that same MAC as the configured virtual MAC address on all the HSRP
> > member routers? 
> 
> Bruce has already responded to this, and I can confirm that it works (a
> customer used this) and is a feasible workaround to get around the
> limitation on the VIP. I'd use a made-up address (or use an address from
> one of your lab routes which you'll never use "in the wild")..
> 
> 	oli
> 
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