IETF Logo Mail Archive

Re: [mpls] draft-fang-mpls-label-forwarding-no-swap - how much does it really save?

Xuxiaohu <xuxiaohu@huawei.com> Wed, 29 July 2015 03:07 UTC

Return-Path: <xuxiaohu@huawei.com>
X-Original-To: mpls@ietfa.amsl.com
Delivered-To: mpls@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 56EDC1B355B for <mpls@ietfa.amsl.com>; Tue, 28 Jul 2015 20:07:27 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.211
X-Spam-Level:
X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham
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 P3R7JoGaztlt for <mpls@ietfa.amsl.com>; Tue, 28 Jul 2015 20:07:25 -0700 (PDT)
Received: from dfwrgout.huawei.com (dfwrgout.huawei.com [206.16.17.72]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CE2731B3559 for <mpls@ietf.org>; Tue, 28 Jul 2015 20:07:23 -0700 (PDT)
Received: from 172.18.9.243 (EHLO lhreml406-hub.china.huawei.com) ([172.18.9.243]) by dfwrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BGQ43934; Tue, 28 Jul 2015 22:07:22 -0500 (CDT)
Received: from nkgeml407-hub.china.huawei.com (10.98.56.38) by lhreml406-hub.china.huawei.com (10.201.5.243) with Microsoft SMTP Server (TLS) id 14.3.235.1; Wed, 29 Jul 2015 04:06:50 +0100
Received: from NKGEML512-MBS.china.huawei.com ([169.254.8.210]) by nkgeml407-hub.china.huawei.com ([10.98.56.38]) with mapi id 14.03.0158.001; Wed, 29 Jul 2015 11:06:45 +0800
From: Xuxiaohu <xuxiaohu@huawei.com>
To: Andrew Qu <andrew.qu@mediatek.com>, "stbryant@cisco.com" <stbryant@cisco.com>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, Robert Raszuk <robert@raszuk.net>, Shahram Davari <davari@broadcom.com>
Thread-Topic: [mpls] draft-fang-mpls-label-forwarding-no-swap - how much does it really save?
Thread-Index: AQHQxdE8/IA6U/LTn0Ga8cjhPANjS53pvZ6AgAUiJgCAAEpHgIABDj8AgABBbwCAAVGScA==
Date: Wed, 29 Jul 2015 03:06:45 +0000
Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0CB028A5@NKGEML512-MBS.china.huawei.com>
References: <DB3PR03MB0780AE3E11BEA6B29B81FF5B9D810@DB3PR03MB0780.eurprd03.prod.outlook.com> <EA360A7AB9D90D4B9E9173B6D27C371EE3F60C0D@MTKMBS61N1.mediatek.inc> <55B64078.7030601@cisco.com> <EA360A7AB9D90D4B9E9173B6D27C371EE3F624BE@MTKMBS61N1.mediatek.inc> <55B7617A.90808@cisco.com> <EA360A7AB9D90D4B9E9173B6D27C371EE3F64252@MTKMBS61N1.mediatek.inc>
In-Reply-To: <EA360A7AB9D90D4B9E9173B6D27C371EE3F64252@MTKMBS61N1.mediatek.inc>
Accept-Language: zh-CN, en-US
Content-Language: zh-CN
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [10.111.99.55]
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-CFilter-Loop: Reflected
Archived-At: <http://mailarchive.ietf.org/arch/msg/mpls/eCgrowRBdaeqITl1vx0wxbh6veM>
Cc: "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] draft-fang-mpls-label-forwarding-no-swap - how much does it really save?
X-BeenThere: mpls@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Multi-Protocol Label Switching WG <mpls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mpls>, <mailto:mpls-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/mpls/>
List-Post: <mailto:mpls@ietf.org>
List-Help: <mailto:mpls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mpls>, <mailto:mpls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 29 Jul 2015 03:07:27 -0000

> So the question really boils down to that do we need global label?
> 
> I believe that is the key thing here.  May be we can put swap/no-swap aside for
> the moment.

Concur.

Best regards,
Xiaohu

> Thanks,
> 
> Andrew
> 
> 
> -----Original Message-----
> From: Stewart Bryant [mailto:stbryant@cisco.com]
> Sent: Tuesday, July 28, 2015 4:03 AM
> To: Andrew Qu; Alexander Vainshtein; Robert Raszuk; Shahram Davari
> Cc: mpls@ietf.org
> Subject: Re: [mpls] draft-fang-mpls-label-forwarding-no-swap - how much does
> it really save?
> 
> > Adding "NO_SWAP" for new/future generation DEVICE does NOT break
> > backward capability.
> >
> Andrew
> 
> Existing devices should be assumed to have non-aligned label spaces.
> (there is much empirical evidence to support this position)
> 
> So if you have a no-swap only device between two existing devices you cannot
> be sure that you can build an LSP.
> 
> A backwards compatible device would therefore need to support swap.
> 
> Once you support swap then no-swap become an optimization.
> 
> - Stewart
> 
> 
> ************* Email Confidentiality Notice ******************** The
> information contained in this e-mail message (including any
> attachments) may be confidential, proprietary, privileged, or otherwise exempt
> from disclosure under applicable laws. It is intended to be conveyed only to the
> designated recipient(s). Any use, dissemination, distribution, printing, retaining
> or copying of this e-mail (including its
> attachments) by unintended recipient(s) is strictly prohibited and may be
> unlawful. If you are not an intended recipient of this e-mail, or believe that you
> have received this e-mail in error, please notify the sender immediately (by
> replying to this e-mail), delete any and all copies of this e-mail (including any
> attachments) from your system, and do not disclose the content of this e-mail to
> any other person. Thank you!
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls

v2.28.0 | Report a Bug | By Email | System Status