Re: The tale of a single MAC

[graham at g-rock.net (GP Wooden)]

Fresh install and the NICs are Broadcom b57 10/100/1000, I believe. 

----- Reply message -----
From: "Randy McAnally" <rsm at fast-serv.com>
Date: Sun, Jan 2, 2011 8:53 am
Subject: The tale of a single MAC
To: "Graham Wooden" <graham at g-rock.net>, <nanog at nanog.org>

---------- Original Message -----------
From: Graham Wooden <graham at g-rock.net>

> Hi there,
> 
> I encountered an interesting issue today and I found it so bizarre ? 
> so I thought I would share it.
> 
> I brought online a spare server to help offload some of the recent 
> VMs that I have been deploying.  Around the same time this new 
> machine (we?ll call it Server-B) came online, another machine which 
> has been online for about a year now stopped responding to our 
> monitoring (and we?ll name this Server-A). I logged into the switch 
> and saw that the machine that stopped responding was in the same 
> VLAN as this newly deployed, and then quickly noticed that Server-
> A?s MAC address was now on Server-B?s switch port. ?What the ...? 
> was my initial response.
> 

Fresh OS install from scratch or did you load an image from an existing server?

What make/model of on-board NICs?

--
Randy M.