netdev - Re: [PATCH] bridge: mask forwarding of IEEE 802 local multicast groups

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Message-ID: <CAF5U64B_fb2tFMLHmK+zw3n6gmq+bYDyFnXhLE0ayssK5m+THA@mail.gmail.com>
Date:	Fri, 12 Aug 2011 22:43:33 -0700
From:	Ed Swierk <eswierk@...switch.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] bridge: mask forwarding of IEEE 802 local multicast groups

On Fri, Aug 12, 2011 at 3:45 PM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> If you turn off STP that is what it does right now. It forwards STP
> and 802.1X frames. The patch was only related to turning on STP
> and still expecting 802.1X frames to be forwarded (in violation of
> the spec).

As far as I can tell, the only case currently where the bridge
forwards a packet destined for a link-local multicast address is

  if (p->br->stp_enabled == BR_NO_STP && dest[5] == 0)

dest[5] != 0 for an LLDP packet, whose destination address is
01-80-C2-00-00-0E per IEEE 802.1AB-2005.

--Ed
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