netdev - Re: [PATCH] bridge: Forward EAPOL Kconfig option BRIDGE_PAE

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Date:	Fri, 1 Jul 2011 12:16:25 +0200
From:	David Lamparter <equinox@...c24.net>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Nick Carter <ncarter100@...il.com>,
	David Lamparter <equinox@...c24.net>, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH] bridge: Forward EAPOL Kconfig option BRIDGE_PAE_FORWARD

On Wed, Jun 29, 2011 at 04:34:23PM -0700, Stephen Hemminger wrote:
> The problem is that the damn 802.1 committees keep loading up protocols
> on the same multicast address range. Trying to solve a design committee 
> problem in the kernel is not going to make anybody happy.
> 
> I am happy with the simple solution of:
>   no STP == Hub
>   STP    == Bridge
> These are both well know configurations and are blessed by standards.

I agree, that is how we should behave by default, and we'll match most
admin's expectations.

Regarding multicast groups, I would summarise like this:
1. any multicast gets forwarded by default,
 2. unless it is 01:80:c2:00:00:01 or :02 (pause/bonding)
    (this rule applies regardless of STP state)
 3. if STP is on:
  4. 01:80:c2:00:00:00 (STP) never gets forwarded
  5. 01:80:c2:00:00:03-0f don't get forwarded by default

What we can do is add a switch to disable the #5 rule. The way I see it
is that that switch would remove an exception from the rule and turn it
back to the default #1; that's acceptable for making a new knob in my
eyes.

(Adding an 802.1X knob would be an exception to the exception for me,
which is why I'm against it.)

I'll cook up a patch in a few minutes, we really need to get rule #2
right anyway. We _MUST_NOT_ pass bonding frames in any case, but we
currently do that if STP is off. (cf. my earlier patch 1/2)


-David

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