[c-nsp] standby use-bia?

Jon Lewis jlewis at lewis.org
Thu Dec 2 12:38:09 EST 2004


On Thu, 2 Dec 2004, Bruce Pinsky wrote:

> As I previously mentioned, my only other worry would be whether your
> switches allow the same MAC address to appear in different VLANs, i.e. a
> forwarding table per VLAN.  The 6500's certainly do.  I know that some
> lower end switches (including cisco's) don't and that the VLAN concept is
> used only to limit flooding and broadcasts.  I've been bitten by this
> before and it makes for some peculiar behavior as well as horrible performance.

I'd expect 3550s to deal properly with duplicate MAC addresses in
different VLANs, but does anyone know for sure?

It's not unheard of for certain hosts (esp old Suns) to have multiple
interfaces but just 1 host MAC address.

----------------------------------------------------------------------
 Jon Lewis                   |  I route
 Senior Network Engineer     |  therefore you are
 Atlantic Net                |
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