Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
"Weiqiang Cheng" <chengweiqiang@chinamobile.com> Wed, 25 September 2019 07:00 UTC
Return-Path: <chengweiqiang@chinamobile.com>
X-Original-To: mpls@ietfa.amsl.com
Delivered-To: mpls@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D414D1200B8; Wed, 25 Sep 2019 00:00:22 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.599
X-Spam-Level:
X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, 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 KUlPQj4Z9_BF; Wed, 25 Sep 2019 00:00:18 -0700 (PDT)
Received: from cmccmta2.chinamobile.com (cmccmta2.chinamobile.com [221.176.66.80]) by ietfa.amsl.com (Postfix) with ESMTP id BBF27120041; Wed, 25 Sep 2019 00:00:13 -0700 (PDT)
Received: from spf.mail.chinamobile.com (unknown[172.16.121.17]) by rmmx-syy-dmz-app06-12006 (RichMail) with SMTP id 2ee65d8b1071c35-0b7bb; Wed, 25 Sep 2019 15:00:01 +0800 (CST)
X-RM-TRANSID: 2ee65d8b1071c35-0b7bb
X-RM-TagInfo: emlType=0
X-RM-SPAM-FLAG: 00000000
Received: from cmcc (unknown[117.136.0.206]) by rmsmtp-syy-appsvr09-12009 (RichMail) with SMTP id 2ee95d8b106fabc-eb35b; Wed, 25 Sep 2019 15:00:00 +0800 (CST)
X-RM-TRANSID: 2ee95d8b106fabc-eb35b
From: Weiqiang Cheng <chengweiqiang@chinamobile.com>
To: 'Tarek Saad' <tsaad.net@gmail.com>, draft-cheng-mpls-inband-pm-encapsulation@ietf.org
Cc: mpls@ietf.org
References: <BYAPR19MB3415E16096ADA1A714B09D93FCC40@BYAPR19MB3415.namprd19.prod.outlook.com>
In-Reply-To: <BYAPR19MB3415E16096ADA1A714B09D93FCC40@BYAPR19MB3415.namprd19.prod.outlook.com>
Date: Wed, 25 Sep 2019 14:59:59 +0800
Message-ID: <017701d5736e$d9153460$8b3f9d20$@com>
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="----=_NextPart_000_0178_01D573B1.E7387460"
X-Mailer: Microsoft Office Outlook 12.0
Thread-Index: AQHVQJIWax8TxKN6GECB1mNyFzhZn6c8W4IA
Content-Language: zh-cn
Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/oLSKg6xyzjnf00pLzjRab3SY45U>
Subject: Re: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation
X-BeenThere: mpls@ietf.org
X-Mailman-Version: 2.1.29
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, 25 Sep 2019 07:00:23 -0000
Hi Tarek, Thank you very much for your comments. We authors had some discussion on it and our feedback is in-line. B.R. Weiqiang Cheng 发件人: mpls [mailto:mpls-bounces@ietf.org] 代表 Tarek Saad 发送时间: 2019年7月22日 21:34 收件人: draft-cheng-mpls-inband-pm-encapsulation@ietf.org 抄送: mpls@ietf.org 主题: [mpls] Comments on draft draft-cheng-mpls-inband-pm-encapsulation Hi authors, >From reading your draft, have the following comments: * There’s a similar proposal in draft-ietf-mpls-rfc6374-sfl that the WG has worked on to achieve similar PM measurements. That proposal did not require a special label, nor requires carrying 2 new additional labels in label stack. Do you see any downside to the approach in draft-ietf-mpls-rfc6374-sfl vs. the new one introduced one? If so, can this be highlighted. [Weiqiang] Yes, the SFL proposal was carefully considered before this draft was written, and the major downsides of SFL include: 1. It seems that the current version of SFL targets at end-to-end performance measurement, but our draft targets at both end-to-end and hop-by-hop performance measurement. Of course, someone may argue that the SFL can be extended to support hop-by-hop performance measurement, but if that happens, the SFL method is too complex for label management, because basically it assigns two implications to one mpls label. 2. The SFL method can't be applied when we want to achieve performance measurements on both LSP and PW synchronously, but the method described in our draft can simply achieve that. * It appears that the label below the “Flow Indicator Label” is used to carry/embed context information: including a flow identifier and additional flags - that are set by ingress. Normally, MPLS labels do not embed any context information about the flow they carry within them. The context of the label is held by the node that allocates the label. [Weiqiang] Your understanding is perfectly correct. And please also note that in our draft the Flow-ID label values are allocated by an external NMS or a controller, that means the context of the Flow-ID label is held by all the nodes within the administrative domain. Furthermore, I want to stress that the method described in our draft has already been implemented by more than two vendors, and we plan to deploy it in our commercial 5G backhaul networks. Regards, Tarek
- [mpls] Comments on draft draft-cheng-mpls-inband-… Tarek Saad
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Weiqiang Cheng
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Rakesh Gandhi
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Tianran Zhou
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Tarek Saad
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Rakesh Gandhi
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Tianran Zhou
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Rakesh Gandhi
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Greg Mirsky
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Giuseppe Fioccola
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Haoyu Song
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Rakesh Gandhi
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Loa Andersson
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Greg Mirsky
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Loa Andersson
- Re: [mpls] Comments on draft draft-cheng-mpls-inb… Tianran Zhou