[c-nsp] standby use-bia?

[Rodney Dunn]

Too early in the morning and not enough coffee.

Most customers I've ever seen go the use-bia route
without problems.

What you are suggesting should work too.  I've never
heard of it being an issue.

Rodney

On Thu, Dec 02, 2004 at 08:23:36AM -0500, Jon Lewis wrote:
> On Thu, 2 Dec 2004, Rodney Dunn wrote:
> 
> > His subject line daid "use-bia" but I don't see it
> > mentioned in the email anywhere.
> >
> > > > 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 issue is, I'm using use-bia now, and it's caused problems.  In my
> original message, I implied that one of the options I think would work is
> to use-bia on one 7500 and use that 7500's bia on the others via
> configured virtual mac addr.  My fear in that case is that at some point
> the router with use-bia might decide to use a different bia (from a
> different FE card...we're doing etherchannel, so each router would have
> several bias to choose from) and cause the problem I'm hoping to avoid.
> So it seems like picking/making up a mac addr and configuring that to be
> the virtual mac addr on all the HSRP group members would be the best way
> to go.  I just wonder why that doesn't seem to be documented as a
> recommended way to get around the VIP2/VIP4 32 AF limit.  i.e. I have to
> wonder if there's some gotcha I haven't considered that makes this a bad
> idea?...other than what would happen if I just randomly picked a mac addr
> and something on the LAN happened to have that as its mac addr.
> 
> ----------------------------------------------------------------------
>  Jon Lewis                   |  I route
>  Senior Network Engineer     |  therefore you are
>  Atlantic Net                |
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