From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 2 Mar 2006 12:31:02 -0800
From: Stephen Hemminger <shemminger@osdl.org>
Subject: Re: [Bridge] bridge MAC address
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To: Levi Ariel-BAL023 <ariel.levi@motorola.com>
Cc: bridge@lists.osdl.org

On Thu, 2 Mar 2006 20:20:38 +0200
"Levi Ariel-BAL023" <ariel.levi@motorola.com> wrote:

> Hi,
> 
>  
> 
> I have notice that the bridge gets the "lowest" MAC address of its
> interfaces.
> 
> Function: br_stp_recalculate_bridge_id()
> 
>  
> 
> Is there a meaning behind this or not?
> 
>  
> 
> Thanks, 
> 
>  Ariel 
> 

It's part of the Spanning Tree Protocol in the 802.1d standard.
In later kernels you can reset the address to be the same as any
of the interfaces being bridged.