From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ross Brattain Subject: Re: [PATCH 2/2] bridge: allow forwarding some link local frames Date: Mon, 17 Oct 2011 16:07:15 -0700 Message-ID: <20111017160715.000024eb@unknown> References: <20111004041444.793960297@vyatta.com> <20111004041509.292932641@vyatta.com> <20111017135323.00003ee5@unknown> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Stephen Hemminger , "David S. Miller" , "netdev@vger.kernel.org" To: Ed Swierk Return-path: Received: from mga09.intel.com ([134.134.136.24]:55264 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754524Ab1JQXHS convert rfc822-to-8bit (ORCPT ); Mon, 17 Oct 2011 19:07:18 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 17 Oct 2011 14:09:34 -0700 Ed Swierk wrote: > Interesting, I didn't realize LLDP could use any of those addresses. >=20 > I finally got a peek at the hot-off-the-presses IEEE 802.1Q-2011, and > notice that 01-80-C2-00-00-0E is now assigned as "Individual LAN Scop= e > group address, Nearest bridge group address" rather than dedicated to > LLDP specifically. >=20 802.1AB-2009 Section 7.1 Destination address: NOTE 8=E2=80=94The destination MAC address used by a given LLDP agent d= efines only the scope of transmission and the intended recipient(s) of the LLDPDUs; it plays no part in protocol iden= tification. In particular, the group MAC addresses identified in Table 7-1 are not used exclusively by LLDP; other protoco= ls that require to use a similar transmission scope are free to use the same addresses. > Since our application is generating the LLDP frames we could change i= t > to use -00 or -03 and let the Linux bridge drop the -0E frames. >=20 If you control both end stations you could use the optional group MAC a= ddress support, or unicast LLDP. 802.1AB-2009 Section 7.1 Destination address: In addition to the prescribed support for standard group MAC addresses = shown in Table 7-1, implementations of LLDP may support the following destination addresses= for LLDPDUs: d) Any group MAC address. e) Any individual MAC address. Support for the use of each of these destination addresses, for both tr= ansmission and reception of LLDPDUs, is either mandatory, recommended, permitted, or not permitted, accordin= g to the type of system in which LLDP is implemented, as shown in Table 7-2. I have no idea if any LLDP agents support the optional group MAC addres= ses. -- Ross