netdev - Re: Bridge connectivity interruptions while devices join or leave the bridge

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Message-ID: <1908a2c1-03d3-07b0-fc76-aa7abd3b0700@techfak.uni-bielefeld.de>
Date:   Wed, 19 Sep 2018 22:57:04 +0200
From:   Johannes Wienke <jwienke@...hfak.uni-bielefeld.de>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Ido Schimmel <idosch@...sch.org>
Cc:     netdev@...r.kernel.org
Subject: Re: Bridge connectivity interruptions while devices join or leave the
 bridge

On 19.09.18 19:03, Stephen Hemminger wrote:
> On Wed, 19 Sep 2018 19:45:08 +0300
> Ido Schimmel <idosch@...sch.org> wrote:
> 
>> On Wed, Sep 19, 2018 at 01:00:15PM +0200, Johannes Wienke wrote:
>>> This behavior of inheriting the mac address is really unexpected to us.
>>> Is it documented somewhere?  
>>
>> Not that I'm aware, but it's a well established behavior.
> 
> Not documented, has always been that way. It seems to be part of 802 standard maybe?
> Anyway, if you set a MAC address of the bridge device it makes it sticky;
> i.e it won't change if ports of bridge change.

Yes sure. It was just unexpected to meet this and we ha no clue that
this could be a reasonable default. I just wonder what the motivation
for hat is and of course some more obvious documentation would have
helped a lot in debugging/avoid this.

Cheers,
Johannes
-- 
Johannes Wienke, Researcher at CoR-Lab / CITEC, Bielefeld University
Address: Inspiration 1, D-33619 Bielefeld, Germany (Room 1.307)
Phone: +49 521 106-67277