[c-nsp] Mac address flapping..

[Matlock, Kenneth L]

I assume the server housing that MAC has 2 NICs, one plugged into
4506-a, and the other in 4506-b?

I've seen it before during a server reboot where it has multiple NICs
that the server guys have configured a virtual MAC, and that MAC bounces
between it's 2 ports a few times during OS startup, causing errors
almost exactly like that. The switch sees the MAC on one port, then the
server uses that MAC on the other port, etc.

I'd see if those error times coincide with reboots of the servers.

Ken Matlock
Network Analyst
Exempla Healthcare
(303) 467-4671
matlockk at exempla.org



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of James Ashton
Sent: Friday, July 10, 2009 12:54 PM
To: A.L.M.Buxey at lboro.ac.uk
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Mac address flapping..

The root bridge is 6509-a.


The one that is showing these log errors.

James

-----Original Message-----
From: A.L.M.Buxey at lboro.ac.uk [mailto:A.L.M.Buxey at lboro.ac.uk] 
Sent: Friday, July 10, 2009 2:39 PM
To: James Ashton
Cc: cisco-nsp at puck.nether.net
Subject: Re: Mac address flapping..

Hi,

> Alan,
>  Po1 is the connection from 6509-a to 6509-b.
>  G1/7 goes to port G1/1 on 4506-a.
>  G1/8 goes to G1/1 on 4506-b.

what is the root bridge for vlan 42?

alan
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