Re: [Idr] Why do we define so many communities for BGP

Nick Hilliard <nick@foobar.org> Tue, 08 November 2016 11:58 UTC

Return-Path: <nick@foobar.org>
X-Original-To: idr@ietfa.amsl.com
Delivered-To: idr@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 101741294B7 for <idr@ietfa.amsl.com>; Tue, 8 Nov 2016 03:58:05 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.201
X-Spam-Level:
X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lJOBSDAESTIt for <idr@ietfa.amsl.com>; Tue, 8 Nov 2016 03:58:03 -0800 (PST)
Received: from mail.netability.ie (mail.netability.ie [IPv6:2a03:8900:0:100::5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 18D3F12953B for <idr@ietf.org>; Tue, 8 Nov 2016 03:57:58 -0800 (PST)
X-Envelope-To: idr@ietf.org
Received: from crumpet.local (admin.ibn.ie [46.182.8.8]) (authenticated bits=0) by mail.netability.ie (8.15.2/8.15.2) with ESMTPSA id uA8BvoiW065268 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 8 Nov 2016 11:57:50 GMT (envelope-from nick@foobar.org)
X-Authentication-Warning: cheesecake.ibn.ie: Host admin.ibn.ie [46.182.8.8] claimed to be crumpet.local
Message-ID: <5821BDBC.7040408@foobar.org>
Date: Tue, 08 Nov 2016 12:57:48 +0100
From: Nick Hilliard <nick@foobar.org>
User-Agent: Postbox 5.0.5 (Macintosh/20161020)
MIME-Version: 1.0
To: "lizhenqiang@chinamobile.com" <lizhenqiang@chinamobile.com>
References: <2016110819514874384911@chinamobile.com>
In-Reply-To: <2016110819514874384911@chinamobile.com>
X-Enigmail-Version: 1.2.3
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/qYrGYci3qhnofvpLTRC0FZ6iVnY>
Cc: idr <idr@ietf.org>
Subject: Re: [Idr] Why do we define so many communities for BGP
X-BeenThere: idr@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Inter-Domain Routing <idr.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/idr>, <mailto:idr-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/idr/>
List-Post: <mailto:idr@ietf.org>
List-Help: <mailto:idr-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/idr>, <mailto:idr-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 08 Nov 2016 11:58:05 -0000

lizhenqiang@chinamobile.com wrote:
> I am confused by large community defined
> in draft-ietf-idr-large-community, wide community defined
> in draft-ietf-idr-wide-bgp-communities, extended community defined in
> RFC4360, community defined in RFC1997. Why do we need so many kinds of
> BGP communities? Can the large community be encoded in type 3 wide
> community? Thank you for your explaination.

this issue has already been addressed extensively on the IDR mailing
list.  Please see the list archives:

http://www.ietf.org/mail-archive/web/idr/

The relevant discussion starts on Sep 3 and ended around Sep 27.  There
were over 400 emails in several threads.

Nick