From nobody Wed Feb 2 09:48:57 2022 Return-Path: X-Original-To: ippm@ietf.org Delivered-To: ippm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 3104D3A17D5; Wed, 2 Feb 2022 09:48:49 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: ippm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.44.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: ippm@ietf.org Message-ID: <164382412913.2150.2867980571608870935@ietfa.amsl.com> Date: Wed, 02 Feb 2022 09:48:49 -0800 Archived-At: Subject: [ippm] I-D Action: draft-ietf-ippm-stamp-srpm-03.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Feb 2022 17:48:50 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the IP Performance Measurement WG of the IETF. Title : Simple TWAMP (STAMP) Extensions for Segment Routing Networks Authors : Rakesh Gandhi Clarence Filsfils Daniel Voyer Mach(Guoyi) Chen Bart Janssens Richard Foote Filename : draft-ietf-ippm-stamp-srpm-03.txt Pages : 16 Date : 2022-02-02 Abstract: Segment Routing (SR) leverages the source routing paradigm. SR is applicable to both Multiprotocol Label Switching (SR-MPLS) and IPv6 (SRv6) forwarding planes. This document specifies RFC 8762 (Simple Two-Way Active Measurement Protocol (STAMP)) extensions for SR networks, for both SR-MPLS and SRv6 forwarding planes by augmenting the optional extensions defined in RFC 8972. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ippm-stamp-srpm/ There is also an HTML version available at: https://www.ietf.org/archive/id/draft-ietf-ippm-stamp-srpm-03.html A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-stamp-srpm-03 Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts From nobody Wed Feb 2 23:54:09 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1C8393A2195 for ; Wed, 2 Feb 2022 23:54:07 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=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 ECfSed_vCT0W for ; Wed, 2 Feb 2022 23:54:03 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [IPv6:2001:1900:3001:11::31]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0D0A33A2190 for ; Wed, 2 Feb 2022 23:54:00 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 499) id 8DE7EEB6C8; Wed, 2 Feb 2022 23:53:59 -0800 (PST) To: rfc-editor@rfc-editor.org From: RFC Errata System Cc: nmalykh@ieee.org, almes@acm.org, skalidindi@ixiacom.com, matt@internet2.edu, acmorton@att.com, ippm@ietf.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20220203075359.8DE7EEB6C8@rfc-editor.org> Date: Wed, 2 Feb 2022 23:53:59 -0800 (PST) Archived-At: Subject: [ippm] [Editorial Errata Reported] RFC7679 (6831) X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Feb 2022 07:54:07 -0000 The following errata report has been submitted for RFC7679, "A One-Way Delay Metric for IP Performance Metrics (IPPM)". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid6831 -------------------------------------- Type: Editorial Reported by: Nikolai Malykh Section: 7 Original Text ------------- The text above constitutes a revision to RFC 2769, which is now an Internet Standard. This section tracks the changes from [RFC2679]. Corrected Text -------------- The text above constitutes a revision to RFC 2679, which is now an Internet Standard. This section tracks the changes from [RFC2679]. Notes ----- Typo in RFC number (2769 instead 2679). Instructions: ------------- This erratum is currently posted as "Reported". If necessary, please use "Reply All" to discuss whether it should be verified or rejected. When a decision is reached, the verifying party can log in to change the status and edit the report, if necessary. -------------------------------------- RFC7679 (draft-ietf-ippm-2679-bis-05) -------------------------------------- Title : A One-Way Delay Metric for IP Performance Metrics (IPPM) Publication Date : January 2016 Author(s) : G. Almes, S. Kalidindi, M. Zekauskas, A. Morton, Ed. Category : INTERNET STANDARD Source : IP Performance Measurement Area : Transport Stream : IETF Verifying Party : IESG From nobody Thu Feb 3 04:58:01 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E4FC03A1659 for ; Thu, 3 Feb 2022 04:57:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.811 X-Spam-Level: X-Spam-Status: No, score=-2.811 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.714, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=tamu.edu 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 5ijvm6YwoZWa for ; Thu, 3 Feb 2022 04:57:54 -0800 (PST) Received: from mail-qt1-x832.google.com (mail-qt1-x832.google.com [IPv6:2607:f8b0:4864:20::832]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 00D763A165D for ; Thu, 3 Feb 2022 04:57:50 -0800 (PST) Received: by mail-qt1-x832.google.com with SMTP id k25so2058077qtp.4 for ; Thu, 03 Feb 2022 04:57:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tamu.edu; s=google; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=JJ+kwv6SeerLp/W381ovbFA1vr1+CKqpf7m9yYDuhEw=; b=L9kgr1GD/nvg9N8gTMmxTd904RqD15NHGgTXke6Cuqp/oJL6YhE4kqwN4kanI5BCSt j4YLhCJDC1GXJdKddpTyklYxyU7vdPsr0kYJNas1XdMgVAnTXoXbcDKNn9FNVV2g5MnF vOAHM7X+JLC2FtGlId26qKHPtfSgyDqcs4mVyq9umt0jcnbmxUArRWo79Fy3NHiikmhh WJbZ0z3Q3FhmfZRlyoGS+JwnacRWypgxXRrsmp7eyAtoITwaFIPVtQSbCZ3d7YSzlBPj P44lH57RxhJarVCvAIdpRCHzhG6bTIQcjDNV3s7GtIggsWp93qZuyYyhfjncoEdboCxK J/OA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=JJ+kwv6SeerLp/W381ovbFA1vr1+CKqpf7m9yYDuhEw=; b=SzgTk1rR6ULnZ+ueME2br3HMquwR8+c0ZIaMxUcvZrdEi+4rPslmNuFjMt3jpZndy2 D4/q8hAVwZJDZOrN8nOb3ZAYgyMe9hyqK3ffY9wTpFKJ0oqKUmtubRCmXUyQTnzXYM58 WwJe30ts2tHVrQ8VlVf8QQ1bXNuljv2W01YH072ss9t2gPNmFmPSvHGmyvF1G9aTf5/5 XBuEMKtq+aDcVpiF91sIuFuC9x3YqX+B1S06R9xobaCJ6vprdlVmZwOeQTXtauvPY8r9 iuGwRLtkBgfC5yL7b3xJzN6miE4QBORjtdKb5XC/MNlwJdsApFOs/6KhFgKHiX554Mog rR8Q== X-Gm-Message-State: AOAM533IXk5PXGHU1ON+k+e4uF7+GDNkogtaDmBXu5J4U28UgxtNf7hO tv6axNPPyzgA9GMU7vYhbzKYzw== X-Google-Smtp-Source: ABdhPJwkezQtRT4cgOpZD6CDaLkhM2HDS1aTz1OnpCTQxUTyBWXWl/ie4UQ5LG/kGydB3rGInCjURQ== X-Received: by 2002:ac8:5a16:: with SMTP id n22mr9573244qta.491.1643893068934; Thu, 03 Feb 2022 04:57:48 -0800 (PST) Received: from [192.168.1.4] (c-73-171-122-193.hsd1.va.comcast.net. [73.171.122.193]) by smtp.gmail.com with ESMTPSA id t11sm9253805qtx.16.2022.02.03.04.57.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Feb 2022 04:57:48 -0800 (PST) Message-ID: <66a22e1d-30dd-2ae4-fd5b-722858c04fe8@tamu.edu> Date: Thu, 3 Feb 2022 07:57:47 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.5.1 Content-Language: en-US To: RFC Errata System Cc: nmalykh@ieee.org, almes@acm.org, skalidindi@ixiacom.com, matt@internet2.edu, acmorton@att.com, ippm@ietf.org References: <20220203075359.8DE7EEB6C8@rfc-editor.org> From: Guy Almes In-Reply-To: <20220203075359.8DE7EEB6C8@rfc-editor.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [ippm] [Editorial Errata Reported] RFC7679 (6831) X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Feb 2022 12:57:59 -0000 It certainly looks right. Comments? -- Guy On 2/3/22 2:53 AM, RFC Errata System wrote: > The following errata report has been submitted for RFC7679, > "A One-Way Delay Metric for IP Performance Metrics (IPPM)". > > -------------------------------------- > You may review the report below and at: > https://urldefense.com/v3/__https://www.rfc-editor.org/errata/eid6831__;!!KwNVnqRv!QZ9qmmdk31TxjrrHqvulDG-m_vzQV1PTwp0-qU2W8m0HMg5rMFig_MdhugMOTg$ > > -------------------------------------- > Type: Editorial > Reported by: Nikolai Malykh > > Section: 7 > > Original Text > ------------- > The text above constitutes a revision to RFC 2769, which is now an > Internet Standard. This section tracks the changes from [RFC2679]. > > Corrected Text > -------------- > The text above constitutes a revision to RFC 2679, which is now an > Internet Standard. This section tracks the changes from [RFC2679]. > > Notes > ----- > Typo in RFC number (2769 instead 2679). > > Instructions: > ------------- > This erratum is currently posted as "Reported". If necessary, please > use "Reply All" to discuss whether it should be verified or > rejected. When a decision is reached, the verifying party > can log in to change the status and edit the report, if necessary. > > -------------------------------------- > RFC7679 (draft-ietf-ippm-2679-bis-05) > -------------------------------------- > Title : A One-Way Delay Metric for IP Performance Metrics (IPPM) > Publication Date : January 2016 > Author(s) : G. Almes, S. Kalidindi, M. Zekauskas, A. Morton, Ed. > Category : INTERNET STANDARD > Source : IP Performance Measurement > Area : Transport > Stream : IETF > Verifying Party : IESG > From nobody Thu Feb 3 08:16:56 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1EC8C3A0CDE for ; Thu, 3 Feb 2022 08:16:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=att.onmicrosoft.com 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 plHuYiP-ICD4 for ; Thu, 3 Feb 2022 08:16:50 -0800 (PST) Received: from mx0a-00191d01.pphosted.com (mx0a-00191d01.pphosted.com [67.231.149.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5AE453A0CDC for ; Thu, 3 Feb 2022 08:16:50 -0800 (PST) Received: from pps.filterd (m0288874.ppops.net [127.0.0.1]) by m0288874.ppops.net-00191d01. 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[73.171.122.193]) by smtp.gmail.com with ESMTPSA id r7sm9580707qkp.82.2022.02.03.09.07.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Feb 2022 09:07:50 -0800 (PST) Message-ID: <8b89bfc6-fb87-42ef-3554-79669bd7dc4e@tamu.edu> Date: Thu, 3 Feb 2022 12:07:49 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.5.1 Content-Language: en-US To: "MORTON JR., AL" , RFC Errata System Cc: "nmalykh@ieee.org" , "almes@acm.org" , "skalidindi@ixiacom.com" , "matt@internet2.edu" , "ippm@ietf.org" References: <20220203075359.8DE7EEB6C8@rfc-editor.org> From: Guy Almes In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [ippm] [Editorial Errata Reported] RFC7679 (6831) X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Feb 2022 17:07:59 -0000 Al, Perfect; thanks! -- Guy On 2/3/22 11:16 AM, MORTON JR., AL wrote: > It's a typo, corrected 2679 text was intended. Verified. > Al > > >> -----Original Message----- >> From: RFC Errata System >> Sent: Thursday, February 3, 2022 2:54 AM >> To: rfc-editor@rfc-editor.org >> Cc: nmalykh@ieee.org; almes@acm.org; skalidindi@ixiacom.com; >> matt@internet2.edu; MORTON JR., AL ; ippm@ietf.org >> Subject: [Editorial Errata Reported] RFC7679 (6831) >> >> The following errata report has been submitted for RFC7679, >> "A One-Way Delay Metric for IP Performance Metrics (IPPM)". >> >> -------------------------------------- >> You may review the report below and at: >> https://urldefense.com/v3/__https://www.rfc- >> editor.org/errata/eid6831__;!!BhdT!2Gg--BgwtTvgianITYMUhFqHlpDX-eU-XdP- >> mg40Tuc_V1Junse7nVKqkwYC$ >> >> -------------------------------------- >> Type: Editorial >> Reported by: Nikolai Malykh >> >> Section: 7 >> >> Original Text >> ------------- >> The text above constitutes a revision to RFC 2769, which is now an >> Internet Standard. This section tracks the changes from [RFC2679]. >> >> Corrected Text >> -------------- >> The text above constitutes a revision to RFC 2679, which is now an >> Internet Standard. This section tracks the changes from [RFC2679]. >> >> Notes >> ----- >> Typo in RFC number (2769 instead 2679). >> >> Instructions: >> ------------- >> This erratum is currently posted as "Reported". If necessary, please >> use "Reply All" to discuss whether it should be verified or >> rejected. When a decision is reached, the verifying party >> can log in to change the status and edit the report, if necessary. >> >> -------------------------------------- >> RFC7679 (draft-ietf-ippm-2679-bis-05) >> -------------------------------------- >> Title : A One-Way Delay Metric for IP Performance Metrics (IPPM) >> Publication Date : January 2016 >> Author(s) : G. Almes, S. Kalidindi, M. Zekauskas, A. 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Thu, 3 Feb 2022 14:20:07 -0800 (PST) To: nmalykh@ieee.org, almes@acm.org, skalidindi@ixiacom.com, matt@internet2.edu, acmorton@att.com From: RFC Errata System Cc: rfc-ed@rfc-editor.org, iesg@ietf.org, ippm@ietf.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20220203222007.AB92DD844F@rfc-editor.org> Date: Thu, 3 Feb 2022 14:20:07 -0800 (PST) Archived-At: Subject: [ippm] [Errata Verified] RFC7679 (6831) X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Feb 2022 22:20:13 -0000 The following errata report has been verified for RFC7679, "A One-Way Delay Metric for IP Performance Metrics (IPPM)". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid6831 -------------------------------------- Status: Verified Type: Editorial Reported by: Nikolai Malykh Date Reported: 2022-02-03 Verified by: RFC Editor Section: 7 Original Text ------------- The text above constitutes a revision to RFC 2769, which is now an Internet Standard. This section tracks the changes from [RFC2679]. Corrected Text -------------- The text above constitutes a revision to RFC 2679, which is now an Internet Standard. This section tracks the changes from [RFC2679]. Notes ----- Typo in RFC number (2769 instead 2679). -------------------------------------- RFC7679 (draft-ietf-ippm-2679-bis-05) -------------------------------------- Title : A One-Way Delay Metric for IP Performance Metrics (IPPM) Publication Date : January 2016 Author(s) : G. Almes, S. Kalidindi, M. Zekauskas, A. Morton, Ed. 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[73.63.232.212]) by smtp.gmail.com with ESMTPSA id f15sm3199858pfn.19.2022.02.04.10.56.56 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 04 Feb 2022 10:56:56 -0800 (PST) MIME-Version: 1.0 Date: Fri, 4 Feb 2022 10:56:53 -0800 From: Jeff Tantsura Thread-Topic: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt In-Reply-To: <76b3ef6c675a4cabac450d4ddea02fbb@huawei.com> Message-ID: <2321055E-2C0E-46F1-A366-8203BD2B944B@hxcore.ol> References: <164300504281.12619.16642699818590435984@ietfa.amsl.com> , <76b3ef6c675a4cabac450d4ddea02fbb@huawei.com> To: Tianran Zhou , Haoyu Song , "IETF IPPM WG (ippm@ietf.org)" Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" Archived-At: Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Feb 2022 18:57:04 -0000

Hi,

 

Wrt power = of two comment from Haoyu.

This used to be the case= in the early days because of poorly implemented load-balancing in the sili= con, it was often the case that with odd number of constituents we=E2=80=99= d see a rather uneven distribution.

Most of these i= ssues have been fixed in the last 3 years, these days - it is very common (= especially in DC) to use a LAG as an operational construct and =C2=A0provis= ion a LAG with a single link, so the future upgrade doesn=E2=80=99t require= changes to L3 infra.

 

I don=E2=80=99t=E2=80=99 think there a need to update the draw= ing nor to explicitly mentioning =C2=A0=E2=80=9Cpower of two=E2=80=9D assum= ption anywhere in the text .

 

<= p class=3DMsoNormal>Cheers,

Jeff

 

= From: Tian= ran Zhou
Sent: Monday, January 24, 2022 5:06 PM
To: Haoyu Song; Tianran Zhou; IETF IPPM WG (ippm@ietf.org)
Subject: = Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt<= /p>

 

Hi = Haoyu,

 

Th= anks very much for your comments. Your perspective is correct.

I will revise the document in the next version.

 

Best,

Tianran

 

-----Original Message-----

From: ippm [mailto= :ippm-bounces@ietf.org] On Behalf Of Haoyu Song

Sen= t: Tuesday, January 25, 2022 1:07 AM

To: Tianran Zh= ou <zhoutianran=3D40huawei.com@dmarc.ietf.org>; IETF IPPM WG (ippm@ie= tf.org) <ippm@ietf.org>

Subject: Re: [ippm] N= ew Version Notification for draft-li-ippm-otwamp-on-lag-02.txt

 

WG,

 

I think the scenario for= LAG performance measurement is practical and the method is sound, so I sup= port this work.

For Figure 1, I think usually for l= oad balancing with hashing, the number of links of a LAG would be power of = two.

 

Bes= t,

Haoyu Song

 

-----Original Message-----

From: ippm <ippm-bounces@ietf.org> On Behalf Of Tianran Zhou

=

Sent: Sunday, January 23, 2022 10:23 PM

To: IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>

Subject: [ippm] FW: New Version Notification for draft-li-ipp= m-otwamp-on-lag-02.txt

 

Hi WG,

 

We think this is an useful work on adapting OWAMP/TWAMP in LAG= performance measurement.

We updated this draft bas= ed on the comments from the meeting discussion and mailing list.

Thanks for all the suggestions.

More = reviews and comments are welcome.

 =

Cheers,

Tianran

 

-----Original Messa= ge-----

From: internet-drafts@ietf.org [mailto:inte= rnet-drafts@ietf.org]

Sent: Monday, January 24, 20= 22 2:17 PM

To: Greg Mirsky <gregimirsky@gmail.co= m>; Guo Jun <guo.jun2@zte.com.cn>; Jun Guo <guo.jun2@zte.com.cn= >; Rakesh Gandhi <rgandhi@cisco.com>; Tianran Zhou <zhoutianran= @huawei.com>; Zhenqiang Li <li_zhenqiang@hotmail.com>

Subject: New Version Notification for draft-li-ippm-otwamp-on-= lag-02.txt

 

 

A new version of I-D, draft-li-= ippm-otwamp-on-lag-02.txt

has been successfully sub= mitted by Tianran Zhou and posted to the IETF repository.

 

Name:=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 draft-li-ip= pm-otwamp-on-lag

Revision:=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 02

Title:=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 One-way/Two-way Active Measurement Protocol Extens= ions for Performance Measurement on LAG

Document da= te:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 2022-01-24<= /p>

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URL:=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 https://nam11.safeli= nks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid= %2Fdraft-li-ippm-otwamp-on-lag-02.txt&amp;data=3D04%7C01%7Chaoyu.song%4= 0futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c753a1= d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4w= LjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata= =3DO1SD54x5%2FM99g7YjxnzaMjaZuJ9S4UxNGcm6NAkTXng%3D&amp;reserved=3D0

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Abstract:

=C2=A0=C2=A0 This document defines extensions to One= -way Active Measurement

=C2=A0=C2=A0 Protocol (OWAM= P), and Two-way Active Measurement Protocol (TWAMP) to

=C2=A0=C2=A0 implement performance measurement on every member link of = a Link

=C2=A0=C2=A0 Aggregation Group (LAG).=C2=A0 = Knowing the measured metrics of each member

=C2=A0= =C2=A0 link of a LAG enables operators to enforce the performance based

=

=C2=A0=C2=A0 traffic steering policy across the member= links.

 

<= o:p> 

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0

 

 

The IETF Secretariat

 

 

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[73.63.232.212]) by smtp.gmail.com with ESMTPSA id mq15sm18962534pjb.8.2022.02.05.10.10.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 05 Feb 2022 10:10:58 -0800 (PST) Content-Type: multipart/alternative; boundary=Apple-Mail-C2ACEA50-1A70-44F7-87E3-3A055AAB466A Content-Transfer-Encoding: 7bit From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Sat, 5 Feb 2022 10:10:57 -0800 Message-Id: References: Cc: Tianran Zhou , "IETF IPPM WG (ippm@ietf.org)" In-Reply-To: To: Haoyu Song X-Mailer: iPhone Mail (19D50) Archived-At: Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 05 Feb 2022 18:11:06 -0000 --Apple-Mail-C2ACEA50-1A70-44F7-87E3-3A055AAB466A Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Haoyu, Yes, comparing even and odd LAGs - deviations from ideal load-sharing are ve= ry similar. Obviously - there=E2=80=99s no need for load-balancing across a single link ;= -) Cheers, Jeff > On Feb 4, 2022, at 11:02, Haoyu Song wrote: >=20 > =EF=BB=BF > Hi Jeff, > =20 > It=E2=80=99s interesting to know. Any idea how the load is balanced on the= odd number of links? > BTW, in your example, a single link is also power of 2 (i.e., 2^0) and the= re=E2=80=99s no need for load balancing. > =20 > Best, > Haoyu > =20 > From: Jeff Tantsura =20 > Sent: Friday, February 4, 2022 10:57 AM > To: Tianran Zhou ; Haoyu Song <= haoyu.song@futurewei.com>; IETF IPPM WG (ippm@ietf.org) > Subject: RE: [ippm] New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > Hi, > =20 > Wrt power of two comment from Haoyu. > This used to be the case in the early days because of poorly implemented l= oad-balancing in the silicon, it was often the case that with odd number of c= onstituents we=E2=80=99d see a rather uneven distribution. > Most of these issues have been fixed in the last 3 years, these days - it i= s very common (especially in DC) to use a LAG as an operational construct an= d provision a LAG with a single link, so the future upgrade doesn=E2=80=99t= require changes to L3 infra. > =20 > I don=E2=80=99t=E2=80=99 think there a need to update the drawing nor to e= xplicitly mentioning =E2=80=9Cpower of two=E2=80=9D assumption anywhere in t= he text . > =20 > Cheers, > Jeff > =20 > From: Tianran Zhou > Sent: Monday, January 24, 2022 5:06 PM > To: Haoyu Song; Tianran Zhou; IETF IPPM WG (ippm@ietf.org) > Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > Hi Haoyu, > =20 > Thanks very much for your comments. Your perspective is correct. > I will revise the document in the next version. > =20 > Best, > Tianran > =20 > -----Original Message----- > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Haoyu Song > Sent: Tuesday, January 25, 2022 1:07 AM > To: Tianran Zhou ; IETF IPPM WG= (ippm@ietf.org) > Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > WG, > =20 > I think the scenario for LAG performance measurement is practical and the m= ethod is sound, so I support this work. > For Figure 1, I think usually for load balancing with hashing, the number o= f links of a LAG would be power of two. > =20 > Best, > Haoyu Song > =20 > -----Original Message----- > From: ippm On Behalf Of Tianran Zhou > Sent: Sunday, January 23, 2022 10:23 PM > To: IETF IPPM WG (ippm@ietf.org) > Subject: [ippm] FW: New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > Hi WG, > =20 > We think this is an useful work on adapting OWAMP/TWAMP in LAG performance= measurement. > We updated this draft based on the comments from the meeting discussion an= d mailing list. > Thanks for all the suggestions. > More reviews and comments are welcome. > =20 > Cheers, > Tianran > =20 > -----Original Message----- > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] > Sent: Monday, January 24, 2022 2:17 PM > To: Greg Mirsky ; Guo Jun ; Ju= n Guo ; Rakesh Gandhi ; Tianran Zhou= ; Zhenqiang Li > Subject: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt > =20 > =20 > A new version of I-D, draft-li-ippm-otwamp-on-lag-02.txt > has been successfully submitted by Tianran Zhou and posted to the IETF rep= ository. > =20 > Name: draft-li-ippm-otwamp-on-lag > Revision: 02 > Title: One-way/Two-way Active Measurement Protocol Extens= ions for Performance Measurement on LAG > Document date: 2022-01-24 > Group: Individual Submission > Pages: 13 > URL: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-li-ippm-otwamp-on-lag-02.txt&a= mp;data=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df0= 20bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnkn= own%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC= I6Mn0%3D%7C3000&sdata=3DO1SD54x5%2FM99g7YjxnzaMjaZuJ9S4UxNGcm6NAkTXng%3D= &reserved=3D0 > Status: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-li-ippm-otwamp-on-lag%2F&da= ta=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed= %7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7= CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0= %3D%7C3000&sdata=3DUYUXVf0BvrCuH20ydOjxCI26KjgpAopEIV40%2BqjuxKY%3D&= reserved=3D0 > Htmlized: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-li-ippm-otwamp-on-lag&am= p;data=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df02= 0bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnkno= wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI= 6Mn0%3D%7C3000&sdata=3DgN9hSIQaMM%2BE%2BtDLSFxe95J%2FyX4omBdv6rtBTMB4B8o= %3D&reserved=3D0 > Diff: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-li-ippm-otwamp-on-lag-02&= ;data=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020= bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknow= n%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6= Mn0%3D%7C3000&sdata=3DNPJcFQoHUAw47%2FJ%2BO4SeOLEaQUNe%2FAI4UDUGMA%2BKK%= 2Fo%3D&reserved=3D0 > =20 > Abstract: > This document defines extensions to One-way Active Measurement > Protocol (OWAMP), and Two-way Active Measurement Protocol (TWAMP) to > implement performance measurement on every member link of a Link > Aggregation Group (LAG). Knowing the measured metrics of each member > link of a LAG enables operators to enforce the performance based > traffic steering policy across the member links. > =20 > =20 > = =20 > =20 > =20 > The IETF Secretariat > =20 > =20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ie= tf.org%2Fmailman%2Flistinfo%2Fippm&data=3D04%7C01%7Chaoyu.song%40futurew= ei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c753a1d5591fedc= %7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC= JQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=3DDHVbIOrP6nfA= fjGnIl5N%2F%2B5B0O6qDonb%2F%2Beq2uTEJu4%3D&reserved=3D0 > =20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > =20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > =20 --Apple-Mail-C2ACEA50-1A70-44F7-87E3-3A055AAB466A Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Haoyu,

Yes, comparing= even and odd LAGs - deviations from ideal load-sharing are very similar.
Obviously - there=E2=80=99s no need for load-balancing across a sing= le link ;-)

Cheers,
Jeff
<= div dir=3D"ltr">
On Feb 4, 2022, at 11:02, Haoy= u Song <haoyu.song@futurewei.com> wrote:

=EF=BB=BF

Hi Jeff,

 

It=E2=80=99s interesting to know. Any idea how the lo= ad is balanced on the odd number of links?

BTW, in your example, a single link is also power of 2= (i.e., 2^0) and there=E2=80=99s no need for load balancing.

 

Best,

Haoyu

 

From: Jeff Tantsura <jefftant.ietf@gmail.co= m>
Sent: Friday, February 4, 2022 10:57 AM
To: Tianran Zhou <zhoutianran=3D40huawei.com@dmarc.ietf.org>; H= aoyu Song <haoyu.song@futurewei.com>; IETF IPPM WG (ippm@ietf.org) <= ;ippm@ietf.org>
Subject: RE: [ippm] New Version Notification for draft-li-ippm-otwamp= -on-lag-02.txt

 

Hi,

 

Wrt power of two comment from Haoyu.

This used to be the case in the early days because of= poorly implemented load-balancing in the silicon, it was often the case tha= t with odd number of constituents we=E2=80=99d see a rather uneven distribut= ion.

Most of these issues have been fixed in the last 3 ye= ars, these days - it is very common (especially in DC) to use a LAG as an op= erational construct and  provision a LAG with a single link, so the fut= ure upgrade doesn=E2=80=99t require changes to L3 infra.

 

I don=E2=80=99t=E2=80=99 think there a need to update= the drawing nor to explicitly mentioning  =E2=80=9Cpower of two=E2=80=9D= assumption anywhere in the text .

 

Cheers,<= /o:p>

Jeff

 

From: Tianran Zhou
Sent: Monday, January 24, 2022 5:06 PM
To: Haoyu Song; Tianran Zhou; IETF IPPM WG (ippm@ietf.o= rg)
Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp= -on-lag-02.txt

 

Hi Haoyu,

 

Thanks very much for your comments. Your perspective i= s correct.

I will revise the document in the next version.<= /o:p>

 

Best,

Tianran

 

-----Original Message-----

From: ippm [= mailto:ippm-bounces@ietf.org] On Behalf Of Haoyu Song

Sent: Tuesday, January 25, 2022 1:07 AM

To: Tianran Zhou <zhoutianran=3D40huawei.com@dmarc.ietf.org&g= t;; IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>

Subject: Re: [ippm] New Version Notification for draf= t-li-ippm-otwamp-on-lag-02.txt

 

WG,

 

I think the scenario for LAG performance measurement i= s practical and the method is sound, so I support this work.

For Figure 1, I think usually for load balancing with= hashing, the number of links of a LAG would be power of two.

 

Best,

Haoyu Song

 

-----Original Message-----

From: ippm <ippm-bounces@ietf.org> On Behalf Of Tianran Zhou

Sent: Sunday, January 23, 2022 10:23 PM

To: IETF IPPM WG (ip= pm@ietf.org) <ippm@ietf.org><= o:p>

Subject: [ippm] FW: New Version Notification for draf= t-li-ippm-otwamp-on-lag-02.txt

 

Hi WG,

 

We think this is an useful work on adapting OWAMP/TWA= MP in LAG performance measurement.

We updated this draft based on the comments from the m= eeting discussion and mailing list.

Thanks for all the suggestions.

More reviews and comments are welcome.

=

 

Cheers,

Tianran

 

-----Original Message-----

From: int= ernet-drafts@ietf.org [mailt= o:internet-drafts@ietf.org]

Sent: Monday, January 24, 2022 2:17 PM

=

To: Greg Mirsky <gregimirsky@gmail.com>; Guo Jun <guo.jun2@zte.com.cn>; Jun Guo <guo.jun2@zte.com.cn>; Rakesh Gandhi <rgandhi@cisco.com>; Tianran= Zhou <zhoutianran@huawei.com>; Zhenqiang Li <li_zhen= qiang@hotmail.com>

Subject: New Version Notification for draft-li-ippm-o= twamp-on-lag-02.txt

 

 

A new version of I-D, draft-li-ippm-otwamp-on-lag-02.= txt

has been successfully submitted by Tianran Zhou and p= osted to the IETF repository.

 

Name:        =        draft-li-ippm-otwamp-on-lag<= /p>

Revision:       &n= bsp;   02

Title:        = ;          One-way/Two-way Acti= ve Measurement Protocol Extensions for Performance Measurement on LAG

Document date:      &nb= sp;    2022-01-24

Group:        = ;       Individual Submission

Pages:        = ;       13

URL:        &= nbsp;   https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ietf= .org%2Farchive%2Fid%2Fdraft-li-ippm-otwamp-on-lag-02.txt&amp;data=3D04%7= C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8f= f2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZs= b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C300= 0&amp;sdata=3DO1SD54x5%2FM99g7YjxnzaMjaZuJ9S4UxNGcm6NAkTXng%3D&amp;r= eserved=3D0

Status:       &nbs= p; https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatrac= ker.ietf.org%2Fdoc%2Fdraft-li-ippm-otwamp-on-lag%2F&amp;data=3D04%7C01%7= Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b= 240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8e= yJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&= ;amp;sdata=3DUYUXVf0BvrCuH20ydOjxCI26KjgpAopEIV40%2BqjuxKY%3D&amp;reserv= ed=3D0

Htmlized:       https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatrac= ker.ietf.org%2Fdoc%2Fhtml%2Fdraft-li-ippm-otwamp-on-lag&amp;data=3D04%7C= 01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff= 2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb= 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000= &amp;sdata=3DgN9hSIQaMM%2BE%2BtDLSFxe95J%2FyX4omBdv6rtBTMB4B8o%3D&am= p;reserved=3D0

Diff:        =    https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ietf= .org%2Frfcdiff%3Furl2%3Ddraft-li-ippm-otwamp-on-lag-02&amp;data=3D04%7C0= 1%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2= a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3= d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&= amp;amp;sdata=3DNPJcFQoHUAw47%2FJ%2BO4SeOLEaQUNe%2FAI4UDUGMA%2BKK%2Fo%3D&= ;amp;reserved=3D0

 

Abstract:

   This document defines extensions to One-= way Active Measurement

   Protocol (OWAMP), and Two-way Active Mea= surement Protocol (TWAMP) to

   implement performance measurement on eve= ry member link of a Link

   Aggregation Group (LAG).  Knowing t= he measured metrics of each member

   link of a LAG enables operators to enfor= ce the performance based

   traffic steering policy across the membe= r links.

 

 

         = ;            &nb= sp;            &= nbsp;            = ;            &nb= sp;            &= nbsp;        

 

 

The IETF Secretariat

 

 

_______________________________________________<= /o:p>

ippm mailing list

ippm@ietf.org

https://nam11.safelinks.protection.outlook.com/= ?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fippm&amp;data=3D= 04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0f= ee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFp= bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7= C3000&amp;sdata=3DDHVbIOrP6nfAfjGnIl5N%2F%2B5B0O6qDonb%2F%2Beq2uTEJu4%3D= &amp;reserved=3D0

 

_______________________________________________<= /o:p>

ippm mailing list

ippm@ietf.org

https://www.ietf.org/mailman/listinfo/ippm

 

_______________________________________________<= /o:p>

ippm mailing list

ippm@ietf.org

https://www.ietf.org/mailman/listinfo/ippm

 

= --Apple-Mail-C2ACEA50-1A70-44F7-87E3-3A055AAB466A-- From nobody Sun Feb 6 08:56:30 2022 Return-Path: X-Original-To: ippm@ietf.org Delivered-To: ippm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8ABF83A0A38; Sun, 6 Feb 2022 08:56:19 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: ippm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.44.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: ippm@ietf.org Message-ID: <164416657916.18012.464795704842394714@ietfa.amsl.com> Date: Sun, 06 Feb 2022 08:56:19 -0800 Archived-At: Subject: [ippm] I-D Action: draft-ietf-ippm-ioam-ipv6-options-07.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Feb 2022 16:56:22 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the IP Performance Measurement WG of the IETF. Title : In-situ OAM IPv6 Options Authors : Shwetha Bhandari Frank Brockners Filename : draft-ietf-ippm-ioam-ipv6-options-07.txt Pages : 13 Date : 2022-02-06 Abstract: In-situ Operations, Administration, and Maintenance (IOAM) records operational and telemetry information in the packet while the packet traverses a path between two points in the network. This document outlines how IOAM data fields are encapsulated in IPv6. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-ipv6-options/ There is also an htmlized version available at: https://datatracker.ietf.org/doc/html/draft-ietf-ippm-ioam-ipv6-options-07 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-ioam-ipv6-options-07 Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts From nobody Sun Feb 6 08:59:10 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 477DF3A0A73; Sun, 6 Feb 2022 08:58:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.598 X-Spam-Level: X-Spam-Status: No, score=-14.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_HI=-5, SPF_NONE=0.001, 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Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Feb 2022 01:25:31 -0000 --_000_6e5bc80d616a4d9d851285505f3731d0huaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgSGVucmlrLA0KDQpUaGlzIGRyYWZ0IGZvbGxvd3MgdGhlIHNhbWUgcGF0dGVybiBhcyBSRkM3 MTMwLCB3aGVyZSBCRkQgaXMgYWxzbyBhIHByb3RvY29sIG92ZXIgVURQLCBhbmQgYXBwbGllZCB0 byBMQUcuDQpJIGFtIG5vdCBzdXJlIGlmIEkgY2FuIGFncmVlIHdpdGggeW91IHRoYXQgVFdBTVAg aXMgbGF5ZXItMywgbm9yIGFuIG9kZCBjaG9pY2UgZm9yIExBRy4NCkZvciB0aGUgWS4xNzMxLCB3 b3VsZCB5b3UgbGlrZSB0byBzaGVkIGxpZ2h0IGhvdyBpdCBjb3VsZCBhcHBseT8gU28gdGhhdCB3 ZSBjYW4gY29tcGFyZS4NCg0KVGhhbmtzLA0KVGlhbnJhbg0KDQpGcm9tOiBIZW5yaWsgTnlkZWxs IFttYWlsdG86aG55ZGVsbEBhY2NlZGlhbi5jb21dDQpTZW50OiBNb25kYXksIEphbnVhcnkgMzEs IDIwMjIgODo1NiBQTQ0KVG86IGxpemhlbnFpYW5nQGNoaW5hbW9iaWxlLmNvbQ0KQ2M6IFRpYW5y 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quoted-printable =0A
Hi Jeff and Haoyu,

The effect of lo= ad balencing in LAG depends on the implementation. It is common now to use= 1 or 10 links in a LAG even in backbone networks. It is up to the operato= r to determine the number of member links used in  a LAG, usually tak= ing into account both the requirement of the traffic and the ability of th= e devices. 

The figure and text in our docs = are used to show the case that it is necessary to extend TWAMP/OWAMP/STAMP= to measure the performance of each link in a LAG. We have no intent to pr= esent a BCP for the nember of member links in a LAG.

<= hr color=3D"#b5c4df" size=3D"1" align=3D"left" style=3D"width: 210px; heig= ht: 1px;">
Best Regards,
Zhenqiang= Li

li_zhenqiang@hotmail.com
 
From: Haoyu Song
=
Date: 2022-02-05 03:02
= Subject: Re: [ippm] New Version Notification for draft-li-ippm-ot= wamp-on-lag-02.txt

H= i Jeff,

=  

It=A1=AFs i= nteresting to know. Any idea how the load is balanced on the odd number of= links?

BTW, = in your example, a single link is also power of 2 (i.e., 2^0) and there=A1= =AFs no need for load balancing.

 

Best,

Haoyu

=  

From: Je= ff Tantsura <jefftant.ietf@gmail.com> 
Sent: Fri= day, February 4, 2022 10:57 AM
To: Tianran Zhou <zhoutia= nran=3D40huawei.com@dmarc.ietf.org>; Haoyu Song <haoyu.song@futurewe= i.com>; IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>
Subjec= t: RE: [ippm] New Version Notification for draft-li-ippm-otwamp-o= n-lag-02.txt

 

Hi,

 

Wrt power= of two comment from Haoyu.

This used to be the case in the early days because of poorl= y implemented load-balancing in the silicon, it was often the case that wi= th odd number of constituents we=A1=AFd see a rather uneven distribution.<= o:p>

Most of these= issues have been fixed in the last 3 years, these days - it is very commo= n (especially in DC) to use a LAG as an operational construct and  pr= ovision a LAG with a single link, so the future upgrade doesn=A1=AFt requi= re changes to L3 infra.

 

I don=A1=AFt=A1=AF think there a need to update the drawing nor to ex= plicitly mentioning  =A1=B0power of two=A1=B1 assumption anywhere in = the text .

 

Cheers,

Jeff

 

From: Tianran Zhou=
Sent: Monday, January 24, 2022 5:06 PM
To: = Hao= yu Song; Tianran Zhou; IETF IPPM WG (ippm@ietf.org)
Su= bject: Re: [ippm] New Version Notification for draft-li-ippm-otwa= mp-on-lag-02.txt

 

Hi Haoyu,

 

Thank= s very much for your comments. Your perspective is correct.

=

I will revise the document = in the next version.

 

Tianr= an

 = ;

-----Original Me= ssage-----

Fr= om: ippm [= mailto:ippm-bounces@ietf.org] On Behalf Of Haoyu Song

Sent: Tuesday, January 25, 20= 22 1:07 AM

To= : Tianran Zhou <zhoutianran=3D40huawei.com@dmarc.ietf.org= >; IETF IPPM WG (ippm@ietf.org>

Subject: Re: [ippm] New Version Notification for draft-li-= ippm-otwamp-on-lag-02.txt

 

WG,

 

I think = the scenario for LAG performance measurement is practical and the method i= s sound, so I support this work.

For Figure 1, I think usually for load balancing with = hashing, the number of links of a LAG would be power of two.

 

Best,

Haoyu Song

 

-----Original Message-----

From: ippm <ippm-bounces@ietf.org>= ; On Behalf Of Tianran Zhou

Sent: Sunday, January 23, 2022 10:23 PM

To: IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>

Subject: [ippm] = FW: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt

 

Hi WG,

 

We think this is an useful work on = adapting OWAMP/TWAMP in LAG performance measurement.

We updated this draft based on the= comments from the meeting discussion and mailing list.

Thanks for all the suggestions.=

More reviews= and comments are welcome.

 

Cheers,

Tianran

 

-----Ori= ginal Message-----

From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]=

Sent: Monday= , January 24, 2022 2:17 PM

To: Greg Mirsky <gregimirsky@gmail.com>; Guo Jun <guo.jun2@zte.com.cn= >; Jun Guo <guo.jun2@zte.com.cn>; Rakesh Gandhi <rgandhi@cisco.com>; Tian= ran Zhou <zhoutianran@huawei.com>; Zhenqiang Li <li_zhenqiang@hotmail.com= >

Subject:= New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt

 

<= p class=3D"MsoNormal" style=3D"margin-right: 0in; margin-left: 0in; font-s= ize: 11pt; font-family: Calibri, sans-serif;"> 

A new version of I-D, draft-li-ipp= m-otwamp-on-lag-02.txt

has been successfully submitted by Tianran Zhou and posted to th= e IETF repository.

 

= Name:           &nb= sp;   draft-li-ippm-otwamp-on-lag

Revision:     &nbs= p;     02

Title:        &= nbsp;         One-way/Two-way Acti= ve Measurement Protocol Extensions for Performance Measurement on LAG=

Document date:&nb= sp;          2022-01-24<= /o:p>

Group:  =              I= ndividual Submission

Pages:          =      13

URL:         &= nbsp;  Status:        =  https://nam11.= safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracker.ietf.org= %2Fdoc%2Fdraft-li-ippm-otwamp-on-lag%2F&amp;data=3D04%7C01%7Chaoyu.son= g%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c7= 53a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjo= iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp= ;sdata=3DUYUXVf0BvrCuH20ydOjxCI26KjgpAopEIV40%2BqjuxKY%3D&amp;reserved= =3D0

Html= ized:       https://nam11.safelinks.protection.outl= ook.com/?url=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-li-= ippm-otwamp-on-lag&amp;data=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca= 16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0= %7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoi= V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=3DgN9hSIQaMM%2= BE%2BtDLSFxe95J%2FyX4omBdv6rtBTMB4B8o%3D&amp;reserved=3D0

Diff:  &nbs= p;        https://nam11.safelinks.protectio= n.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-l= i-ippm-otwamp-on-lag-02&amp;data=3D04%7C01%7Chaoyu.song%40futurewei.co= m%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C= 1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJ= QIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=3DNPJcFQo= HUAw47%2FJ%2BO4SeOLEaQUNe%2FAI4UDUGMA%2BKK%2Fo%3D&amp;reserved=3D0=

 <= /o:p>

Abstract:

   This doc= ument defines extensions to One-way Active Measurement

   Protocol (OWAMP), a= nd Two-way Active Measurement Protocol (TWAMP) to

   implement performance = measurement on every member link of a Link

   Aggregation Group (LAG).  = Knowing the measured metrics of each member

   link of a LAG enables operator= s to enforce the performance based

   traffic steering policy across the memb= er links.

 

&nbs= p;

  &nb= sp;            = ;            &= nbsp;           &nb= sp;            = ;            &= nbsp;           &nb= sp;    

 

 

The IETF Secretariat

 

 

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= https://www.ietf.org/mailman/listinfo/ippm

 

<= /blockquote>
=0A ------=_001_NextPart368012786631_=------ From nobody Mon Feb 7 05:07:22 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 20B733A0E1A; Mon, 7 Feb 2022 05:07:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=uliege.be 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 1fL3CeN_nuKI; Mon, 7 Feb 2022 05:07:13 -0800 (PST) Received: from serv108.segi.ulg.ac.be (serv108.segi.ulg.ac.be [139.165.32.111]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CE81B3A0E1D; Mon, 7 Feb 2022 05:07:11 -0800 (PST) Received: from mbx12-zne.ulg.ac.be (serv470.segi.ulg.ac.be [139.165.32.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by serv108.segi.ulg.ac.be (Postfix) with ESMTPS id 4FBA4200F807; Mon, 7 Feb 2022 14:07:09 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 serv108.segi.ulg.ac.be 4FBA4200F807 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=uliege.be; s=ulg20190529; t=1644239229; bh=0dE17OjbTmsVrKWvITmMc26+P8ZjrtqTba6SUpigrc4=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:From; b=xTCnJONq+MEdo3Qx1JrAWZ3WUyJJxX4TMWqj2urERSoW8oRFfqB0VgVsIhGDO3U5V 5oouyuPHzEsQ1UmR2J0ud+Oui6FAk3YNfuQlWldk8xrxmAyy07gBl5/Tdm76cdKmz0 XYGhzcYYRGbrkt00j5un5lR8BE+Bd0WoT1//B/9+RHdWGB3sJrkzzJ2IWdeyfvIj6U AMYgx9LURg3FQWEim/1zXEKzh4+QjK87zBI9NKKbGk2yvPbkYHtWyl30MGRnK9ovAm QTTQhSs3uC+gZNvKAd9N5Vyd2+aIELUnL5517R+CX6iWu85jBb3Ellp+qE95vKHSeP K7BShCXB1ly4Q== Received: from localhost (localhost [127.0.0.1]) by mbx12-zne.ulg.ac.be (Postfix) with ESMTP id 4251660415BA2; Mon, 7 Feb 2022 14:07:09 +0100 (CET) Received: from mbx12-zne.ulg.ac.be ([127.0.0.1]) by localhost (mbx12-zne.ulg.ac.be [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 2WWp_VJYXM6U; Mon, 7 Feb 2022 14:07:09 +0100 (CET) Received: from mbx12-zne.ulg.ac.be (mbx12-zne.ulg.ac.be [139.165.32.199]) by mbx12-zne.ulg.ac.be (Postfix) with ESMTP id DFC8A602244DF; Mon, 7 Feb 2022 14:07:08 +0100 (CET) Date: Mon, 7 Feb 2022 14:07:08 +0100 (CET) From: Justin Iurman Reply-To: Justin Iurman To: "Frank Brockners (fbrockne)" Cc: Erik Kline , Marcus Ihlar , IPv6 List , ippm@ietf.org Message-ID: <2093190259.19857239.1644239228672.JavaMail.zimbra@uliege.be> In-Reply-To: References: <1698496306.248840871.1640786935077.JavaMail.zimbra@uliege.be> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [139.165.223.37] X-Mailer: Zimbra 8.8.15_GA_4018 (ZimbraWebClient - FF96 (Linux)/8.8.15_GA_4026) Thread-Topic: WG Last Call for draft-ietf-ippm-ioam-ipv6-options Thread-Index: AQHX/L29LTdhs/e+lki/fjsSOsrNhayG+7Fw1AtOaA4= Archived-At: Subject: Re: [ippm] WG Last Call for draft-ietf-ippm-ioam-ipv6-options X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 Feb 2022 13:07:20 -0000 Hi Frank, LGTM, thanks for this. I think this document is ready to progress. Justin On Feb 6, 2022, at 5:58 PM, Frank Brockners (fbrockne) fbrockne@cisco.com wrote: > Hi Justin, > > Sorry for the late response. I've just posted a revision > (https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-ipv6-options/07/) which > includes the two suggested changes below. > > Cheers, Frank > >> -----Original Message----- >> From: ippm On Behalf Of Justin Iurman >> Sent: Wednesday, 29 December 2021 15:09 >> To: Erik Kline >> Cc: Marcus Ihlar ; IPv6 List >> ; ippm@ietf.org >> Subject: Re: [ippm] WG Last Call for draft-ietf-ippm-ioam-ipv6-options >> >> Hi ippm, 6man, >> >> I do believe this document is almost ready, though it probably needs a new >> version to address the following review comments. >> >> 1) In section 4 ("In-situ OAM Metadata Transport in IPv6"), third paragraph, it >> says: >> >> "In order for IOAM to work in IPv6 networks, IOAM MUST be explicitly >> enabled per interface on every node within the IOAM domain. Unless a >> particular interface is explicitly enabled (i.e., explicitly >> configured) for IOAM, a router MUST drop packets that contain >> extension headers carrying IOAM data-fields. This is the default >> behavior and is independent of whether the Hop-by-Hop options or >> Destination options are used to encode the IOAM data. This ensures >> that IOAM data does not unintentionally get forwarded outside the >> IOAM domain." >> >> I don't think "a router MUST drop packets" is correct. IOAM options are defined >> with type "00", i.e., skip over this option and continue processing the header. >> Instead, I would rather have something like "a router MUST ignore IOAM >> options". Indeed, you don't want a node to drop packets with IOAM options, >> when not configured, to keep consistency with the behavior of type "00". This is >> the role of a firewall to drop packets if it detects IOAM injections or IOAM >> leaks. >> >> New text suggestion: >> >> "In order for IOAM to work in IPv6 networks, IOAM MUST be explicitly >> enabled per interface on every node within the IOAM domain. Unless a >> particular interface is explicitly enabled (i.e., explicitly >> configured) for IOAM, a router MUST ignore IOAM Options. As >> additional security, IOAM domains SHOULD provide a mechanism to >> prevent injections at ingress or leaks at egress." >> >> Note that the last sentence could be omitted, as consideration #4 (see section >> 5.1) already talks about it. >> >> 2) Section 5.4.1 ("IPv6-in-IPv6 encapsulation") describes a hacky way to >> encapsulate packets. Instead of using the egress as the outer destination >> address, it uses the same destination address as the inner one. I understand the >> pros of such a technique (i.e., same forwarding path), but it goes against >> RFC2473 and, as a consequence, also against RFC8200. So, I don't think it should >> be part of a standard. Since the "normal" IPv6-in-IPv6 use case is implicitly >> included in the next section (5.4.2, "IP-in-IPv6 encapsulation with ULA"), I >> think >> section >> 5.4.1 could/should be dropped. >> >> Thanks, >> Justin >> >> On Dec 17, 2021, at 10:37 PM, Erik Kline ek.ietf@gmail.com wrote: >> > +6MAN WG, just as an FYI >> > >> > On Fri, Dec 17, 2021 at 7:39 AM Marcus Ihlar >> > wrote: >> >> >> >> Hello IPPM, >> >> >> >> This email starts a Working Group Last Call on >> >> draft-ietf-ippm-ioam-ipv6-options. >> >> >> >> >> >> >> >> https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-ipv6-options/ >> >> >> >> https://datatracker.ietf.org/doc/html/draft-ietf-ippm-ioam-ipv6-optio >> >> ns-06 >> >> >> >> >> >> >> >> Please provide feedback by replying to this email with your reviews >> >> and if you think this document is ready to progress, by Friday, January 14. >> >> >> >> >> >> >> >> Best Regards, >> >> >> >> Marcus & Tommy >> >> >> >> _______________________________________________ >> >> ippm mailing list >> >> ippm@ietf.org >> >> https://www.ietf.org/mailman/listinfo/ippm >> > >> > -------------------------------------------------------------------- >> > IETF IPv6 working group mailing list >> > ipv6@ietf.org >> > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> > -------------------------------------------------------------------- >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org > > https://www.ietf.org/mailman/listinfo/ippm From nobody Mon Feb 7 22:42:43 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9F6243A08BE for ; Mon, 7 Feb 2022 22:42:35 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 ykALfwoIMwY1 for ; Mon, 7 Feb 2022 22:42:07 -0800 (PST) Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id ED3BC3A045B for ; Mon, 7 Feb 2022 22:42:06 -0800 (PST) Received: by mail-pf1-x42e.google.com with SMTP id i186so17297753pfe.0 for ; Mon, 07 Feb 2022 22:42:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=e+sbgHGjnoYFrod+WtBCkhYqoHpzkxtDeDPFJY26sBs=; b=bTDwpL7L3cpIOJW+0cXi1sT8CuEOAAxHy/tfb9bpILMUfED6RhWrryvy4sjAvXNvjC ec1g4CCDJIQBZIvA4M61uGFP+ShuJsGdjNntHYsnY6qjhzLYfVWBhWY8ScK7up9H+yuA J5LjlJ4sXXt/jLM9yiter4UlAdw9GqxHXVHBSfCC5R19SQfDdGh3Ar3ApeDf4Z69xRWN 3lt2Q/qXPMaXHkhe+ZOZ1jhOjxC1RXVTTq/7EVOEpZrjtdwM9ThgKig1SQ2lQIrny7L3 QXkiZYd9895c83I8olTvGkvcFZWs2/UeWs2Mmcewr6TNFZTeoLDCGE0bPNtfj/eG1Ysf x6Wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=e+sbgHGjnoYFrod+WtBCkhYqoHpzkxtDeDPFJY26sBs=; b=5OU/mjA6gsWhf/feJmGE00nlMynsQWr7UupEykjz1mX0FKa5qJrBzACDsyUje6HE7B 99uE95buN+u8gfwF4T89XkYeXb7a6q+fhkARHXgdck0l0GWhwQeKDKqy8S80S23ok2qf AcKNXgu8MdMOd5opJqi2g6YPD0JgDwll5T/l4ScdZMSCKDlkdLM9Z1rotghz75wvnf4B oNFCzhqAqzUm28/u84g3vxk06lSTmq2JcDTiVLNEElxwV7JoYZGUHFn37/tj6LxUHd0X 6NI58x9cXls9NcV2K8F3r1vE35J2Kv2pvBwv+p5eCVoAZnLQ3n1xBkQvO/BybLjKzq6b lXPQ== X-Gm-Message-State: AOAM530AFqXqF7sLTrr1dpxyKMygVWlsqiacdjNLtCuanmBKKEKAEZnh u3nzaXtZDnc7pp0wMVJhplZYQONkbjk= X-Google-Smtp-Source: ABdhPJw+nrMiNTwGUt1Bvd3M4GuLvc2jiNopN6XhC1GHyqLx5UkGVulKvhM0ZkG+CtqkAcQMqc0lKA== X-Received: by 2002:a63:da0b:: with SMTP id c11mr2406177pgh.436.1644302524720; Mon, 07 Feb 2022 22:42:04 -0800 (PST) Received: from smtpclient.apple (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id bm3sm9603365pgb.88.2022.02.07.22.42.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Feb 2022 22:42:03 -0800 (PST) Content-Type: multipart/alternative; boundary=Apple-Mail-533F7357-EE77-4E68-BC1A-683116D45853 Content-Transfer-Encoding: 7bit From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Mon, 7 Feb 2022 22:42:02 -0800 Message-Id: <9827D13A-624C-4937-86EC-4657E75576D0@gmail.com> References: <2022020710240121786616@chinamobile.com> Cc: Song , Tianran Zhou , ippm In-Reply-To: <2022020710240121786616@chinamobile.com> To: lizhenqiang@chinamobile.com X-Mailer: iPhone Mail (19D50) Archived-At: Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Feb 2022 06:42:37 -0000 --Apple-Mail-533F7357-EE77-4E68-BC1A-683116D45853 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Zhenqiang, That was my point, to keep the drawing and text as is. Cheers, Jeff > On Feb 6, 2022, at 18:23, lizhenqiang@chinamobile.com wrote: >=20 > =EF=BB=BF > Hi Jeff and Haoyu, >=20 > The effect of load balencing in LAG depends on the implementation. It is c= ommon now to use 1 or 10 links in a LAG even in backbone networks. It is up t= o the operator to determine the number of member links used in a LAG, usual= ly taking into account both the requirement of the traffic and the ability o= f the devices.=20 >=20 > The figure and text in our docs are used to show the case that it is neces= sary to extend TWAMP/OWAMP/STAMP to measure the performance of each link in a= LAG. We have no intent to present a BCP for the nember of member links in a= LAG. >=20 > Best Regards, > Zhenqiang Li >=20 > li_zhenqiang@hotmail.com > =20 > From: Haoyu Song > Date: 2022-02-05 03:02 > To: Jeff Tantsura; Tianran Zhou; IETF IPPM WG (ippm@ietf.org) > Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > Hi Jeff, > =20 > It=E2=80=99s interesting to know. Any idea how the load is balanced on the= odd number of links? > BTW, in your example, a single link is also power of 2 (i.e., 2^0) and the= re=E2=80=99s no need for load balancing. > =20 > Best, > Haoyu > =20 > From: Jeff Tantsura =20 > Sent: Friday, February 4, 2022 10:57 AM > To: Tianran Zhou ; Haoyu Song <= haoyu.song@futurewei.com>; IETF IPPM WG (ippm@ietf.org) > Subject: RE: [ippm] New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > Hi, > =20 > Wrt power of two comment from Haoyu. > This used to be the case in the early days because of poorly implemented l= oad-balancing in the silicon, it was often the case that with odd number of c= onstituents we=E2=80=99d see a rather uneven distribution. > Most of these issues have been fixed in the last 3 years, these days - it i= s very common (especially in DC) to use a LAG as an operational construct an= d provision a LAG with a single link, so the future upgrade doesn=E2=80=99t= require changes to L3 infra. > =20 > I don=E2=80=99t=E2=80=99 think there a need to update the drawing nor to e= xplicitly mentioning =E2=80=9Cpower of two=E2=80=9D assumption anywhere in t= he text . > =20 > Cheers, > Jeff > =20 > From: Tianran Zhou > Sent: Monday, January 24, 2022 5:06 PM > To: Haoyu Song; Tianran Zhou; IETF IPPM WG (ippm@ietf.org) > Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > Hi Haoyu, > =20 > Thanks very much for your comments. Your perspective is correct. > I will revise the document in the next version. > =20 > Best, > Tianran > =20 > -----Original Message----- > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Haoyu Song > Sent: Tuesday, January 25, 2022 1:07 AM > To: Tianran Zhou ; IETF IPPM WG= (ippm@ietf.org) > Subject: Re: [ippm] New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > WG, > =20 > I think the scenario for LAG performance measurement is practical and the m= ethod is sound, so I support this work. > For Figure 1, I think usually for load balancing with hashing, the number o= f links of a LAG would be power of two. > =20 > Best, > Haoyu Song > =20 > -----Original Message----- > From: ippm On Behalf Of Tianran Zhou > Sent: Sunday, January 23, 2022 10:23 PM > To: IETF IPPM WG (ippm@ietf.org) > Subject: [ippm] FW: New Version Notification for draft-li-ippm-otwamp-on-l= ag-02.txt > =20 > Hi WG, > =20 > We think this is an useful work on adapting OWAMP/TWAMP in LAG performance= measurement. > We updated this draft based on the comments from the meeting discussion an= d mailing list. > Thanks for all the suggestions. > More reviews and comments are welcome. > =20 > Cheers, > Tianran > =20 > -----Original Message----- > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] > Sent: Monday, January 24, 2022 2:17 PM > To: Greg Mirsky ; Guo Jun ; Ju= n Guo ; Rakesh Gandhi ; Tianran Zhou= ; Zhenqiang Li > Subject: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt > =20 > =20 > A new version of I-D, draft-li-ippm-otwamp-on-lag-02.txt > has been successfully submitted by Tianran Zhou and posted to the IETF rep= ository. > =20 > Name: draft-li-ippm-otwamp-on-lag > Revision: 02 > Title: One-way/Two-way Active Measurement Protocol Extens= ions for Performance Measurement on LAG > Document date: 2022-01-24 > Group: Individual Submission > Pages: 13 > URL: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-li-ippm-otwamp-on-lag-02.txt&a= mp;data=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df0= 20bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnkn= own%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC= I6Mn0%3D%7C3000&sdata=3DO1SD54x5%2FM99g7YjxnzaMjaZuJ9S4UxNGcm6NAkTXng%3D= &reserved=3D0 > Status: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-li-ippm-otwamp-on-lag%2F&da= ta=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed= %7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7= CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0= %3D%7C3000&sdata=3DUYUXVf0BvrCuH20ydOjxCI26KjgpAopEIV40%2BqjuxKY%3D&= reserved=3D0 > Htmlized: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-li-ippm-otwamp-on-lag&am= p;data=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df02= 0bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnkno= wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI= 6Mn0%3D%7C3000&sdata=3DgN9hSIQaMM%2BE%2BtDLSFxe95J%2FyX4omBdv6rtBTMB4B8o= %3D&reserved=3D0 > Diff: https://nam11.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-li-ippm-otwamp-on-lag-02&= ;data=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020= bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknow= n%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6= Mn0%3D%7C3000&sdata=3DNPJcFQoHUAw47%2FJ%2BO4SeOLEaQUNe%2FAI4UDUGMA%2BKK%= 2Fo%3D&reserved=3D0 > =20 > Abstract: > This document defines extensions to One-way Active Measurement > Protocol (OWAMP), and Two-way Active Measurement Protocol (TWAMP) to > implement performance measurement on every member link of a Link > Aggregation Group (LAG). Knowing the measured metrics of each member > link of a LAG enables operators to enforce the performance based > traffic steering policy across the member links. > =20 > =20 > = =20 > =20 > =20 > The IETF Secretariat > =20 > =20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ie= tf.org%2Fmailman%2Flistinfo%2Fippm&data=3D04%7C01%7Chaoyu.song%40futurew= ei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c753a1d5591fedc= %7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC= JQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=3DDHVbIOrP6nfA= fjGnIl5N%2F%2B5B0O6qDonb%2F%2Beq2uTEJu4%3D&reserved=3D0 > =20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > =20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > =20 --Apple-Mail-533F7357-EE77-4E68-BC1A-683116D45853 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Zhenqiang,

That was m= y point, to keep the drawing and text as is.

Cheers,=
Jeff

On Fe= b 6, 2022, at 18:23, lizhenqiang@chinamobile.com wrote:

=
=EF=BB=BF
Hi Jeff and Haoyu,

The effec= t of load balencing in LAG depends on the implementation. It is common now t= o use 1 or 10 links in a LAG even in backbone networks. It is up to the oper= ator to determine the number of member links used in  a LAG, usually ta= king into account both the requirement of the traffic and the ability of the= devices. 

The figure and text in our docs are= used to show the case that it is necessary to extend TWAMP/OWAMP/STAMP to m= easure the performance of each link in a LAG. We have no intent to present a= BCP for the nember of member links in a LAG.

<= div style=3D"font-family: =E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91; font-size: 1= 4px; line-height: 21px;">Best Regards,
Zhenqia= ng Li

li_zhenqiang@hotmail.com
 
From: Haoyu Song
Da= te: 2022-02-05 03:02
To: Jeff Tantsura; <= a href=3D"mailto:zhoutianran=3D40huawei.com@dmarc.ietf.org" style=3D"color: b= lue;">Tianran Zhou; IETF IPPM WG (ippm@ietf.org)
Subject: Re:= [ippm] New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt
<= p class=3D"MsoNormal" style=3D"margin-right: 0in; margin-left: 0in; font-siz= e: 11pt; font-family: Calibri, sans-serif;">Hi Jeff,

 

It=E2=80=99s interesting to know. Any idea how the l= oad is balanced on the odd number of links?

BTW, in your example, a single link is also power= of 2 (i.e., 2^0) and there=E2=80=99s no need for load balancing.=

 

Best,

Haoyu

 

From: Jeff Tantsura <jefftant.ietf@gmail.com> 
Sent:&n= bsp;Friday, February 4, 2022 10:57 AM
To: Tianran Zhou <zh= outianran=3D40huawei.com@dmarc.ietf.org>; Haoyu Song <haoyu.song@futur= ewei.com>; IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>
Subje= ct: RE: [ippm] New Version Notification for draft-li-ippm-otwamp-on= -lag-02.txt

 

Hi,=

 

Wrt power of two comment f= rom Haoyu.

This us= ed to be the case in the early days because of poorly implemented load-balan= cing in the silicon, it was often the case that with odd number of constitue= nts we=E2=80=99d see a rather uneven distribution.

Most of these issues have been fixed in th= e last 3 years, these days - it is very common (especially in DC) to use a L= AG as an operational construct and  provision a LAG with a single link,= so the future upgrade doesn=E2=80=99t require changes to L3 infra.

 

I don=E2=80=99t=E2=80=99 think there= a need to update the drawing nor to explicitly mentioning  =E2=80=9Cpo= wer of two=E2=80=9D assumption anywhere in the text .

 

Cheers,

Jeff

 

From: Tianran Zhou
Sent: Monday, January 24, 2022 5:06 PM
<= b>To: Haoyu Song; Tianran Zhou; IETF IPPM WG (ippm@ietf.org)
Subject: Re: [ippm] New Version Notification for draft-li-ippm-otw= amp-on-lag-02.txt

 

Hi H= aoyu,

 =

Thanks very much for y= our comments. Your perspective is correct.

I will revise the document in the next version.

 

Best,

Tianran

 

-----Original Message-----

From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Haoyu= Song

Sent: Tuesd= ay, January 25, 2022 1:07 AM

To: Tianran Zhou <zhoutianran=3D40huawei.com@dmarc.ie= tf.org>; IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>

Subject: Re: [ippm] New Version Notification for draft-li-= ippm-otwamp-on-lag-02.txt

 

WG= ,

 

I think the scenario for L= AG performance measurement is practical and the method is sound, so I suppor= t this work.

For = Figure 1, I think usually for load balancing with hashing, the number of lin= ks of a LAG would be power of two.

 

Best,

Hao= yu Song

&nbs= p;

-----Original Messag= e-----

From: ippm= <ippm-bo= unces@ietf.org> On Behalf Of Tianran Zhou

Sent: Sunday, January 23, 2022 10:23 PM=

To: IETF IPPM WG (ippm@ietf.org) <<= a href=3D"mailto:ippm@ietf.org" style=3D"color: blue;">ippm@ietf.org>=

Subject: [ippm] = FW: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt

 

Hi WG,

 

We think this is an useful work on adapting OWAMP/TWAMP i= n LAG performance measurement.

We updated this draft based on the comments from the meeting d= iscussion and mailing list.

Thanks for all the suggestions.

More reviews and comments are welcome.<= /p>

 

Cheers,

Tianran

 

-----Original Message-----

From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.= org]

Sent: Mo= nday, January 24, 2022 2:17 PM

To: Greg Mirsky <gregimirsky@gmail.com>; Guo Jun <guo.jun2@zte.com.cn&g= t;; Jun Guo <rgandhi@cisco.com>; Tianran Zhou <= ;zhoutianra= n@huawei.com>; Zhenqiang Li <li_zhenqiang@hotmail.com>

Subject: New Version Notificat= ion for draft-li-ippm-otwamp-on-lag-02.txt

 

 

A new version of I-D, draft-li-ippm-otwamp-on-lag-02.txt

<= p class=3D"MsoNormal" style=3D"margin-right: 0in; margin-left: 0in; font-siz= e: 11pt; font-family: Calibri, sans-serif;">has been successfully submitted b= y Tianran Zhou and posted to the IETF repository.

 

Name:        =        draft-li-ippm-otwamp-on-lag<= /p>

Revision:   &= nbsp;       02

Title:       =            One-way/Two-way= Active Measurement Protocol Extensions for Performance Measurement on LAG

Document date:&nbs= p;          2022-01-24

Group:   &= nbsp;           Individual= Submission

Pages= :            &nb= sp;  13

URL:=             https://nam11.safelinks.protectio= n.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-li-ip= pm-otwamp-on-lag-02.txt&amp;data=3D04%7C01%7Chaoyu.song%40futurewei.com%= 7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C= 0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV= 2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=3DO1SD54x5%2FM99g= 7YjxnzaMjaZuJ9S4UxNGcm6NAkTXng%3D&amp;reserved=3D0

Status:     = ;    https://n= am11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracker.ietf.= org%2Fdoc%2Fdraft-li-ippm-otwamp-on-lag%2F&amp;data=3D04%7C01%7Chaoyu.so= ng%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c75= 3a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC= 4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdat= a=3DUYUXVf0BvrCuH20ydOjxCI26KjgpAopEIV40%2BqjuxKY%3D&amp;reserved=3D0

Htmlized: =       https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%= 2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-li-ippm-otwamp-on-lag&amp;da= ta=3D04%7C01%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed= %7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7= CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0= %3D%7C3000&amp;sdata=3DgN9hSIQaMM%2BE%2BtDLSFxe95J%2FyX4omBdv6rtBTMB4B8o= %3D&amp;reserved=3D0

Diff:          = ; https://nam11.sa= felinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.ietf.org%2Frfcdiff%3= Furl2%3Ddraft-li-ippm-otwamp-on-lag-02&amp;data=3D04%7C01%7Chaoyu.song%4= 0futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2a3b240189c753a1d= 5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLj= AwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=3D= NPJcFQoHUAw47%2FJ%2BO4SeOLEaQUNe%2FAI4UDUGMA%2BKK%2Fo%3D&amp;reserved=3D= 0

 =

Abstract:<= /p>

   This document d= efines extensions to One-way Active Measurement

   Protocol (OWAMP), and Two-way Ac= tive Measurement Protocol (TWAMP) to

   implement performance measurement on every m= ember link of a Link

   Aggregation Group (LAG).  Knowing the measured metrics= of each member

&n= bsp;  link of a LAG enables operators to enforce the performance based<= o:p>

   traf= fic steering policy across the member links.

 

 

           &n= bsp;            =             &nbs= p;            &n= bsp;            =             &nbs= p;      

 

 

The IETF Secretariat

 

=  

_______________= ________________________________

ippm mailing list

ippm@i= etf.org

https://nam11.safelinks.protection.outlook.com/?url=3D= https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fippm&amp;data=3D04%7C0= 1%7Chaoyu.song%40futurewei.com%7Ca16115736bab48d99c2f08d9df020bed%7C0fee8ff2= a3b240189c753a1d5591fedc%7C1%7C0%7C637786022170908705%7CUnknown%7CTWFpbGZsb3= d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&= amp;amp;sdata=3DDHVbIOrP6nfAfjGnIl5N%2F%2B5B0O6qDonb%2F%2Beq2uTEJu4%3D&a= mp;reserved=3D0

 

_______= ________________________________________

ippm mailing list

ippm@ietf.org

https://www.ietf.org/mailman/listinfo/ippm

 

_______________________________________________<= o:p>

ippm mailing list=

ippm@ietf.org

https://www.ietf.org/mailman/listi= nfo/ippm

 

= --Apple-Mail-533F7357-EE77-4E68-BC1A-683116D45853-- From nobody Tue Feb 8 09:17:41 2022 Return-Path: X-Original-To: ippm@ietf.org Delivered-To: ippm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id D8BF23A105B; Tue, 8 Feb 2022 09:17:39 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: , , X-Test-IDTracker: no X-IETF-IDTracker: 7.44.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <164434065985.14005.50001901138538307@ietfa.amsl.com> Date: Tue, 08 Feb 2022 09:17:39 -0800 Archived-At: Subject: [ippm] The IPPM WG has placed draft-morton-ippm-capacity-metric-protocol in state "Adopted by a WG" X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Feb 2022 17:17:40 -0000 The IPPM WG has placed draft-morton-ippm-capacity-metric-protocol in state Adopted by a WG (entered by Tommy Pauly) The document is available at https://datatracker.ietf.org/doc/draft-morton-ippm-capacity-metric-protocol/ From nobody Tue Feb 8 13:10:47 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A1F63A11CC for ; Tue, 8 Feb 2022 13:10:43 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 ceHC5iQ0slTF for ; Tue, 8 Feb 2022 13:10:40 -0800 (PST) Received: from mail-ej1-x634.google.com (mail-ej1-x634.google.com [IPv6:2a00:1450:4864:20::634]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D5A3A3A11B8 for ; Tue, 8 Feb 2022 13:10:39 -0800 (PST) Received: by mail-ej1-x634.google.com with SMTP id fy20so1529257ejc.0 for ; Tue, 08 Feb 2022 13:10:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=m/wtuzWrj8YQXkGTo6qkS6Rm+b7lxzGiKk3fcXW/Ahc=; b=DJsVDZ5bzE/v/sGqKYtT1OTscLKmvKJDKot9GwZMlg61Ug1ANGvri2un04qPQxZrzE S0CzjTJCDRXx7rfv0D2liP+0Bt2YHBCt7YaR9+p35zIR1MwYtYObxnrdpptejOjhtyeG 6s1y2snQkjJFdxomRzmovigGgjdLzKRollx4URPgh0RnL5HANptRhwAG9XwxkiTT83x1 4u85KkmLjXnFV25i7sYfsp5OnpOOBcH+KDQe4t1MgaLHfuay9Po2ZNxqrrbQ8KY2t9M2 3TYnHHq5ZfqGdwAbzRgEnX5ZibZCE2UCpUUERyOh65ZyfwSEhDSwwDXT2Xe2lG/Pquf1 ILcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=m/wtuzWrj8YQXkGTo6qkS6Rm+b7lxzGiKk3fcXW/Ahc=; b=UNDJ5aNnCc/QQ8fLVQmmXg/0Ueconv56jIpjQfqnoMouyV6tJTOpidN09N2vaUDvct dTPqi2gk3Qa5PJ0AgQ2pHPjKGE0/mhJx0jtRy4KqjMB6EsUWlVTFol8wtFAByO/xTIkE 9e4SNmUmzJBdxkopWutx+iDICKH3fULfPOe7CW+m1RAlh7hVJp2desFfDjsYOkhfCJYt yw4b04JBBMGYJxkagVQzTiArc/UBMKkmMm1aHR04gGmEv7AN3Flt4fx++pU+G0EkAsFF OuZRLeQcBoKLvvvvpFyyr88MliF9NH9kBxi1S4xAWvhMXd5i7gkJwYFFqM6ol2p88Cr4 zPyg== X-Gm-Message-State: AOAM530jbuQUvo+erJv4EchGhgSutysur9LIm4vg3POkFZUckjrQHnJq oi9nCWyzgn8A56r1tlgPIy+rL/QSCfwB936Qeis= X-Google-Smtp-Source: ABdhPJxycA6B+CNXH/fo7pazdbpLLgnPRyW/fv8iaSKDjYz0In4uoHJWmA0kDdbL9HoKlklNUFJXrHXfXEqDP2Y0HhM= X-Received: by 2002:a17:907:72d0:: with SMTP id du16mr5184739ejc.506.1644354636886; Tue, 08 Feb 2022 13:10:36 -0800 (PST) MIME-Version: 1.0 References: <3DC3F6B6-229E-46C6-BD84-2A6A7FE6DD48@apple.com> <9340CFDA-079C-4490-A01C-EB863D365F8F@apple.com> In-Reply-To: <9340CFDA-079C-4490-A01C-EB863D365F8F@apple.com> From: Greg Mirsky Date: Tue, 8 Feb 2022 13:10:25 -0800 Message-ID: To: Christoph Paasch Cc: Marcus Ihlar , IETF IPPM WG Content-Type: multipart/alternative; boundary="00000000000004362405d7882665" Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Feb 2022 21:10:44 -0000 --00000000000004362405d7882665 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Christoph, apologies for the belated response and thank you for sharing interesting details of you using the measurement method. I think that if the measurement method can not only provide the Round-trip Per Minute (RPM) metric but expose the network propagation and residential components of the round-trip delay, then it seems to me, the scope of the draft to be aligned with the charter of the IPPM WG and I'll be in favor of the WG adoption of the work. What do you think? What is the opinion of the authors and the WG? Regards, Greg On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch wrote: > Hello Greg, > > On Jan 6, 2022, at 3:00 PM, Greg Mirsky wrote: > > Hi Christoph, > a happy and healthy New Year to you and All! > > > Happy New Year to you as well! > > Thank you for your kind consideration of my notes and detailed responses. > Please find my follow-up notes in-line below under the GIM>> tag. > > > Thanks for your replies. Please see inline: > > On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch > wrote: > >> Hello Greg, >> >> thanks for your comments. Please see inline: >> >> On Dec 22, 2021, at 11:43 PM, Greg Mirsky wrote: >> >> Dear Marcus, Authors, et al, >> apologies for the belated response. >> I've read the draft and have some comments to share with you: >> >> - as I understand it, the proposed new responsiveness metric is >> viewed as the single indicator of a bufferbloat condition in a networ= k. As >> I recall, the discussion at Measuring Network Quality for End-Users >> workshop and on the mailing list >> >> indicated, that there=E2=80=99s no consensus on what behaviors, sympt= oms can >> reliably signal the bufferbloat. >> >> We are not trying for this responsiveness metric to be "the single >> indicator of bufferbloat". Bufferbloat can be measured in many different >> number of ways. And each of these will produce a correct, but a differen= t >> result. Thus, "bufferbloat" is whatever the methodology tries to detect. >> >> Let me give an example of two methodologies that are both correct but >> both will produce entirely different numbers : >> >> If we would decide to generate the load by flooding the network with UDP >> traffic from a specific 4-tuple and measure latency with parallel ICMP >> pings. Then, on a over-buffered FIFO queue we would measure huge latenci= es >> (thus correctly expose bufferbloat), while on a FQ-codel queue we would = not >> measure any bufferbloat. >> >> If on the other hand, the load-generating traffic is changing the >> source-port for every single UDP-packet, then in both the FIFO-queue and >> the FQ-codel queue we will measure huge amounts of bufferbloat. >> >> Thus, these two methods both produced correct results but with hugely >> different numbers in the FQ-codel case. [1] >> >> Now, while both methods measure some variant of bufferbloat, they both >> don't measure a realistic usage of the network. >> > GIM>> Thank you for the insights. It seems to me that what the method can > demonstrate is rather the level of efficiency of the AQM in the network f= or > a particular class of applications. > > > Yes, that is a good description. It is for a "particular class of > applications" and we are trying to make this class of applications > representative of a "typical user-scenario". (admittedly, we can debate > forever on what kind of applications are representative and I would love = to > have that debate :-)). > > On the point of "efficiency of the AQM". I would go even further that it'= s > not only AQM but also the client- and server-side implementations of thes= e > applications (as noted further below). > > > >> >> That is why the "Responsiveness under working conditions" tries to >> clearly specify how the load is generated and how the latency is being >> measured. And it does not measure "bufferbloat" but it measures >> "responsiveness under working conditions" based on the methodology that = is >> being used (using HTTP/2 or HTTP/3, multiple flows, ...). It does expose >> bufferbloat which can happen in the network. It also exposes certain >> server-side behaviors that can cause (huge amounts of) additional latenc= y - >> those behaviors are typically not called "bufferbloat". >> > GIM>> Thank you for pointing out that the result of the RTT measurement > has two contributing factors - network and server. > > > Yes, servers contribute as do the client-side implementations. It's all > three (client, network, server) that need to work "correctly" to achieve > good responsiveness. Btw., as we are now gathering more experience with o= ur > methodology in different environments we find that the biggest portions o= f > latency actually come from the server-side. We see several seconds of > latency introduced by the HTTP/2 and TCP implementations. > > It seems worth enhancing the method to localize each contribution and > measure them separately. > > > With the latency measuring probes being sent on load-bearing connections > and separate connections and with the separate connections serving to > measure DNS/TCP/... individually, the different data-points actually allo= w > to localize to some extend. > > However, I would be reluctant to dive too deep into > localization/trouble-shooting/debugging of networks as part of this I-D. = As > this opens a whole new can of worms. We could then start thinking about > sending latency-probes while playing with the IP TTL to find which router > is introducing the latency,... It's an entirely different research-topic > IMO :-) Dave Taht was thinking of starting something along these lines ( > https://github.com/dtaht/wtbb). > > >> >> >> - It seems that it would be reasonable to first define what is being >> measured, characterized by the responsiveness metric. Having a docume= nt >> that discusses and defines the bufferbloat would be great. >> >> I agree that there is a lack of definition for what "bufferbloat" really >> is. >> >> The way we look at "responsiveness under working conditions" is that it >> measures the latency in conditions that may realistically happen in >> worst-case scenarios with end-users/implementations that are non-malicio= us >> (non-malicious to exclude the UDP-flooding scenario). >> >> Thus, I assume we should make a better job at explaining this. The lack >> of a formal definition of "bufferbloat" doesn't help and thus we are ind= eed >> using this term a bit freely in the current draft. We will improve the >> Introduction to better set the stage ( >> https://github.com/network-quality/draft-cpaasch-ippm-responsiveness/iss= ues/31 >> ). >> >> >> - It seems like in the foundation of the methodology described in the >> draft lies the assumption that without adding new flows the >> available bandwidth is constant, does not change. While that is mostl= y the >> case, there are technologies that behave differently and may change >> bandwidth because of the outside conditions. Some of these behaviors = of >> links with variable discrete bandwidth are discussed in, for example,= RFC >> 8330 and RFC 8625 >> . >> >> I'm not sure I entirely understand your comment. But let me explain why >> we are gradually adding new flows: >> >> 1. TCP-implementations have usually a fixed limit for the upper bound of >> the receive window. In some networks that upper bound is lower than the = BDP >> of the network. Thus, the only way to reach full capacity is by having >> multiple flows. >> 2. Having multiple connections allows to quicker achieve full capacity i= n >> high-RTT networks and thus speeds up the test-duration. >> 3. In some networks with "random" packet-loss, congestion-control may >> come in the way of achieving full capacity. Again, multiple flows will w= ork >> around that. >> > GIM>> I might have asked several questions at once. Let me clarify what I > am looking for: > > - As I understand the method of creating the "working conditions in a > network" is based on certain assumptions. First, seems is that the > bandwidth is symmetrical between the measurement points. Second, that = the > bandwidth doesn't change for the duration of the measurement session. > AFAIK, in the access networks, both are not necessarily always the cas= e. > > We don't have the assumption that bandwidth is symmetrical (assuming, you > mean uplink/downlink symmetry - please clarify otherwise). > > The load-generating algorithm runs independently for uplink and downlink > traffic. And it is perfectly fine when both have huge asymmetry. > > > Regarding the stability of the bandwidth: > You are making a good point indeed that we assume that the bandwidth is t= o > some extend stable while ramping up the flows to "working conditions". > Admittedly that assumption does not always hold, and that is one of the > reasons why we try hard for the test to not take too long. > I'm not sure how we could adjust the algorithm for varying bandwidth > without introducing too much complexity. I'm open for suggestions :-) > > > - On the other hand, I might have missed how the method of creating > the "working conditions" guarantees a symmetrical load between the > measurement points. > > As mentioned above, we don't assume a symmetrical load. Can you show us > where in the draft we give that impression, so we can fix that? > > >> >> - Then, I find the motivation not to use time units to express the >> responsiveness metric not convincing: >> >> "Latency" is a poor measure of responsiveness, since it can be hard >> for the general public to understand. The units are unfamiliar >> ("what is a millisecond?") and counterintuitive ("100 msec - that >> sounds good - it's only a tenth of a second!"). >> >> >> Can you expand on what exactly is not convincing to you? Do you think >> that people will mis-understand the metric or that milli-seconds is the >> right way to communicate responsiveness to the general public? >> > GIM>> Let me try. We know packet delay requirements for AR, VR > applications. I believe that gamers are familiar with these numbers too. > The same is likely the case for the industrial automation use cases serve= d, > for example, by Deterministic Networking. > > > I can understand that for a technical audience, milli-seconds is easy and > familiar. A non-technical audience might be more open to accepting a new > "higher-is-better" metric. Responsiveness is something new and abstract s= o, > it's kind of natural that it comes with a new unit. > > But I fully recognize that that's a controversial topic and can be > discussed at length :) > > > Cheers, > Christoph > > >> >> Thanks a lot, >> Christoph >> >> [1] And there are many networks that prioritize ICMP pings, thus we coul= d >> observe even more different results based on what protocol is used to >> measure the latency. >> >> >> On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar > 40ericsson.com@dmarc.ietf.org> wrote: >> >>> Hi IPPM, >>> >>> >>> >>> This email starts an adoption call for >>> draft-cpaasch-ippm-responsiveness, "Responsiveness under Working >>> Conditions=E2=80=9D. This document specifies the =E2=80=9CRPM Test=E2= =80=9D for measuring user >>> experience when the network is fully loaded. The intended status of the >>> document is Experimental. >>> >>> >>> >>> https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/ >>> >>> >>> https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-responsiveness= -01 >>> >>> >>> >>> This adoption call will last until *Monday, December 20*. Please review >>> the document, and reply to this email thread to indicate if you think I= PPM >>> should adopt this document. >>> >>> >>> >>> BR, >>> >>> Marcus >>> >>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >>> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm >> >> >> > --00000000000004362405d7882665 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Christoph,
apologies for the belat= ed response and thank you for sharing interesting details of you using the = measurement method. I think that if the measurement method can not only pro= vide the Round-trip=C2=A0Per Minute (RPM) metric but expose the network pro= pagation and residential components of the round-trip delay, then it seems = to me, the scope of the draft to be aligned with the charter of the IPPM WG= and I'll be in favor of the WG adoption of the work.
What=C2= =A0do you think? What is the opinion of the authors and the WG?
<= br>
Regards,
Greg

On Thu, Jan 6, 2022 at 4:42 PM C= hristoph Paasch <cpaasch@apple.com<= /a>> wrote:
<= div style=3D"overflow-wrap: break-word;">Hello Greg,


Hi Christoph,
a happy and healthy New Year to you and All!
=

Happy New Year to you as= well!

Thank you for your kind consideration of my not= es and detailed responses. Please find my follow-up notes=C2=A0in-line belo= w under the GIM>> tag.

Thanks for your replies. Please see inline:

<= /div>
On Wed, Jan 5, = 2022 at 10:52 AM Christoph Paasch <cpaasch@apple.com> wrote:
Hello Greg,

than= ks for your comments. Please see inline:

On Dec 22, 2021, at 11:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:=

Dear Marcus, Authors, et al,
apologies for the belated respons= e.
I've read the draft and have some comments to share with y= ou:
  • as I understand it, the proposed new responsiveness m= etric is viewed as the single indicator of a bufferbloat condition in a net= work. As I recall,=C2=A0the discussion at Measuring Network Quality for End= -Users workshop and on the mailing list indicated, that t= here=E2=80=99s no consensus on what behaviors, symptoms can reliably signal= the bufferbloat.
We are not trying for this responsiveness metric to be "the sin= gle indicator of bufferbloat". Bufferbloat can be measured in many dif= ferent number of ways. And each of these will produce a correct, but a diff= erent result. Thus, "bufferbloat" is whatever the methodology tri= es to detect.

Let me give an example of two method= ologies that are both correct but both will produce entirely different numb= ers :

If we would decide to generate the load by f= looding the network with UDP traffic from a specific 4-tuple and measure la= tency with parallel ICMP pings. Then, on a over-buffered FIFO queue we woul= d measure huge latencies (thus correctly expose bufferbloat), while on a FQ= -codel queue we would not measure any bufferbloat.

If on the other hand, the load-generating traffic is changing the source-p= ort for every single UDP-packet, then in both the FIFO-queue and the FQ-cod= el queue we will measure huge amounts of bufferbloat.

<= div>Thus, these two methods both produced correct results but with hugely d= ifferent numbers in the FQ-codel case. [1]

Now, wh= ile both methods measure some variant of bufferbloat, they both don't m= easure a realistic usage of the network.
GIM>> Thank you for the insights. It seems to me that what the= method can demonstrate is rather the level of efficiency of the AQM in the= network for a particular class of applications.

Yes, that is a good description. It is = for a "particular class of applications" and we are trying to mak= e this class of applications representative of a "typical user-scenari= o". (admittedly, we can debate forever on what kind of applications ar= e representative and I would love to have that debate :-)).

<= /div>
On the point of "efficiency of the AQM". I would go eve= n further that it's not only AQM but also the client- and server-side i= mplementations of these applications (as noted further below).



That is why the "= ;Responsiveness under working conditions" tries to clearly specify how= the load is generated and how the latency is being measured. And it does n= ot measure "bufferbloat" but it measures "responsiveness und= er working conditions" based on the methodology that is being used (us= ing HTTP/2 or HTTP/3, multiple flows, ...). It does expose bufferbloat whic= h can happen in the network. It also exposes certain server-side behaviors = that can cause (huge amounts of) additional latency - those behaviors are t= ypically not called "bufferbloat".
GIM>> Thank you for pointing out that the result of the RT= T measurement has two contributing factors - network and server.

Yes, servers contribute= as do the client-side implementations. It's all three (client, network= , server) that need to work "correctly" to achieve good responsiv= eness. Btw., as we are now gathering more experience with our methodology i= n different environments we find that the biggest portions of latency actua= lly come from the server-side. We see several seconds of latency introduced= by the HTTP/2 and TCP implementations.

=
It s= eems worth enhancing the method to localize each contribution and measure t= hem separately.

With the latency measuring probes being sent on load-bearing connections= and separate connections and with the separate connections serving to meas= ure DNS/TCP/... individually, the different data-points actually allow to l= ocalize to some extend.

However, I would be reluct= ant to dive too deep into localization/trouble-shooting/debugging of networ= ks as part of this I-D. As this opens a whole new can of worms. We could th= en start thinking about sending latency-probes while playing with the IP TT= L to find which router is introducing the latency,... It's an entirely = different research-topic IMO :-) Dave Taht was thinking of starting somethi= ng along these lines (https://github.com/dtaht/wtbb).

    • It seems that it would be reasonable to first defin= e what is being measured, characterized=C2=A0by the responsiveness metric. = Having a document that discusses and defines the bufferbloat would be great= .
    I agree th= at there is a lack of definition for what "bufferbloat" really is= .

    The way we look at "responsiveness under wo= rking conditions" is that it measures the latency in conditions that m= ay realistically happen in worst-case scenarios with end-users/implementati= ons that are non-malicious (non-malicious to exclude the UDP-flooding scena= rio).

    Thus, I assume we should make a better job a= t explaining this. The lack of a formal definition of "bufferbloat&quo= t; doesn't help and thus we are indeed using this term a bit freely in = the current draft. We will improve the Introduction to better set the stage= (https://github.com/network-quality/draf= t-cpaasch-ippm-responsiveness/issues/31).

    <= div dir=3D"ltr">
    • It seems like in the foundation of the methodo= logy described in the draft lies the assumption=C2=A0that without adding ne= w flows the available=C2=A0bandwidth=C2=A0is constant, does not change. Whi= le that is mostly the case, there are technologies that behave differently = and may change bandwidth because of the outside conditions. Some of these b= ehaviors of links with variable discrete=C2=A0bandwidth are discussed in, f= or example,=C2=A0RFC 8330=C2=A0and RFC= 8625.
    I= 'm not sure I entirely understand your comment. But let me explain why = we are gradually adding new flows:

    1. TCP-implemen= tations have usually a fixed limit for the upper bound of the receive windo= w. In some networks that upper bound is lower than the BDP of the network. = Thus, the only way to reach full capacity is by having multiple flows.
    2. Having multiple connections allows to quicker achieve full capacit= y in high-RTT networks and thus speeds up the test-duration.
    3. I= n some networks with "random" packet-loss, congestion-control may= come in the way of achieving full capacity. Again, multiple flows will wor= k around that.
    GIM>> I might= have asked several questions at once. Let me clarify what I am looking for= :
    • As I understand the method of creating the "workin= g conditions in a network" is based on certain assumptions. First, see= ms is that the bandwidth is symmetrical between the measurement points. Sec= ond, that the bandwidth doesn't change for the duration of the measurem= ent session. AFAIK, in the access networks, both are not necessarily always= the case.
    We don&= #39;t have the assumption that bandwidth is symmetrical (assuming, you mean= uplink/downlink symmetry - please clarify otherwise).

    =
    The load-generating algorithm runs independently for uplink and downli= nk traffic. And it is perfectly fine when both have huge asymmetry.


    Regarding the stability of the bandwidth:<= /div>
    You are making a good point indeed that we assume that the bandwi= dth is to some extend stable while ramping up the flows to "working co= nditions". Admittedly that assumption does not always hold, and that i= s one of the reasons why we try hard for the test to not take too long.
    I'm not sure how we could adjust the algorithm for varying bandw= idth without introducing too much complexity. I'm open for suggestions = :-)
    <= div class=3D"gmail_quote">
    • On the other hand, I might have miss= ed how the method of creating the "working conditions" guarantees= a symmetrical load between the measurement points.
    As mentioned above, we don't assume a= symmetrical load. Can you show us where in the draft we give that impressi= on, so we can fix that?


    • Then, I = find the motivation not to use time units to express the responsiveness met= ric not convincing:
    =C2=A0 =C2=A0"L= atency" is a poor measure of responsiveness, since it can be hard
    =C2=A0 =C2=A0for the general public to understa= nd.=C2=A0 The units are unfamiliar
    =C2=A0 = =C2=A0("what is a millisecond?") and counterintuitive ("100 = msec - that
    =C2=A0 =C2=A0sounds good - it&#= 39;s only a tenth of a second!").
    =

    Can you expand on what exactly is no= t convincing to you? Do you think that people will mis-understand the metri= c or that milli-seconds is the right way to communicate responsiveness to t= he general public?
    GIM>> Let me tr= y. We know packet delay requirements for AR, VR applications. I believe tha= t gamers are familiar with these numbers too. The same is likely the case f= or the industrial automation use cases served, for example, by Deterministi= c Networking.

    I can understand that for a technical audience, milli-seconds is easy and = familiar. A non-technical audience might be more open to accepting a new &q= uot;higher-is-better" metric. Responsiveness is something new and abst= ract so, it's kind of natural that it comes with a new unit.
    =
    But I fully recognize that that's a controversial topic = and can be discussed at length :)


    C= heers,
    Christoph



    Th= anks a lot,
    Christoph

    [1] And there are = many networks that prioritize ICMP pings, thus we could observe even more d= ifferent results based on what protocol is used to measure the latency.

    On Mon, Dec 6, 2021 at 7:5= 3 AM Marcus Ihlar <marcus.ihlar=3D40ericsson.com@dmarc.ietf.o= rg> wrote:

    Hi IPPM,<= u>

    <= /u>=C2=A0

    This email starts an adoption call for draft-cpaasch-ippm-responsiven= ess, "Responsiveness under Working Conditions=E2=80=9D. This document = specifies the =E2=80=9CRPM Test=E2=80=9D for measuring user experience when= the network is fully loaded. The intended status of the document is Experiment= al. =C2=A0=C2=A0

    =C2=A0

    <= span style=3D"font-size:12pt">htt= ps://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/=

    https://datatracker.ietf.org/= doc/html/draft-cpaasch-ippm-responsiveness-01

    =C2=A0

    This adoption call will last until Monday, December 20. Please review the document, and reply to this e= mail thread to indicate if you think IPPM should adopt this document.

    =C2=A0

    BR,

    Marcus

    =C2=A0

    _______________________________________________
    ippm mailing list
    ippm@= ietf.org
    https://www.ietf.org/mailman/listinfo/ippm<= br>
    _______________________________________________
    ippm mailing list
    ippm@ietf.org
    https://= www.ietf.org/mailman/listinfo/ippm


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tests=[BAYES_00=-1.9, CTE_8BIT_MISMATCH=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=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 dvwY7AikSwIU for ; Thu, 10 Feb 2022 00:13:05 -0800 (PST) Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.216.63.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BD7DF3A0598 for ; Thu, 10 Feb 2022 00:13:04 -0800 (PST) Received: from mxct.zte.com.cn (unknown [192.168.251.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mxhk.zte.com.cn (FangMail) with ESMTPS id 4JvTyQ1Wg6z8MwF4 for ; Thu, 10 Feb 2022 16:13:02 +0800 (CST) Received: from mse-fl1.zte.com.cn (unknown [10.30.14.238]) (using 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X-FangMail-Envelope: 1644480782/4JvTyQ1Wg6z8MwF4/6204C90E.000/192.168.251.13/[192.168.251.13]/mxct.zte.com.cn/ X-Fangmail-Anti-Spam-Filtered: true X-Fangmail-MID-QID: 6204C90E.000/4JvTyQ1Wg6z8MwF4 Archived-At: Subject: Re: [ippm] =?utf-8?q?FW=3A_New_Version_Notification_for_draft-li-ipp?= =?utf-8?q?m-otwamp-on-lag-02=2Etxt?= X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Feb 2022 08:13:10 -0000 I agree with Guo Jun and support its progressing. Cheers, Xiao Min ------------------原始邮件------------------ 发件人：郭俊10086979 收件人：zhoutianran=40huawei.com@dmarc.ietf.org; 抄送人：ippm@ietf.org; 日 期 ：2022年02月10日 15:43 主 题 ：Re: [ippm] FW: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt _______________________________________________ ippm mailing list ippm@ietf.org https://www.ietf.org/mailman/listinfo/ippm Hi Tianran, I have review the new version, LAG performance measurement is a important feature,I think this work is very meaningful. I support it and hope it can evolve forward. In addition, I have a question below: "To support the micro TWAMP session, a new command, Request-TW-Micro- Session (TBD2), is defined in this document. The Request-TW-Micro- Session command is based on the TWAMP Request-Session command, and uses the message format as described in Section 3.5 of TWAMP [RFC5357]. " My question is: member links have the same source IP 、destination IP 、source port number, and destination port number, if use the message format as described in Section 3.5 of TWAMP[RFC5357]. How to distinguish member link session of LAG? 郭俊 软件平台南京开发三部/有线研究院/有线产品经营部 中兴通讯股份有限公司 南京市雨花台区紫荆花路68号南研一期2楼，210012 T: xxxxxxx M: 18105183663 E: guo.jun2@zte.com.cn 发件人：TianranZhou 收件人：IETF IPPM WG (ippm@ietf.org); 日 期 ：2022年01月24日 14:23 主 题 ：[ippm] FW: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt Hi WG, We think this is an useful work on adapting OWAMP/TWAMP in LAG performance measurement. We updated this draft based on the comments from the meeting discussion and mailing list. Thanks for all the suggestions. More reviews and comments are welcome. Cheers, Tianran -----Original Message----- From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] Sent: Monday, January 24, 2022 2:17 PM To: Greg Mirsky ; Guo Jun ; Jun Guo ; Rakesh Gandhi ; Tianran Zhou ; Zhenqiang Li Subject: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt A new version of I-D, draft-li-ippm-otwamp-on-lag-02.txt has been successfully submitted by Tianran Zhou and posted to the IETF repository. Name: draft-li-ippm-otwamp-on-lag Revision: 02 Title: One-way/Two-way Active Measurement Protocol Extensions for Performance Measurement on LAG Document date: 2022-01-24 Group: Individual Submission Pages: 13 URL: https://www.ietf.org/archive/id/draft-li-ippm-otwamp-on-lag-02.txt Status: https://datatracker.ietf.org/doc/draft-li-ippm-otwamp-on-lag/ Htmlized: https://datatracker.ietf.org/doc/html/draft-li-ippm-otwamp-on-lag Diff: https://www.ietf.org/rfcdiff?url2=draft-li-ippm-otwamp-on-lag-02 Abstract: This document defines extensions to One-way Active Measurement Protocol (OWAMP), and Two-way Active Measurement Protocol (TWAMP) to implement performance measurement on every member link of a Link Aggregation Group (LAG). Knowing the measured metrics of each member link of a LAG enables operators to enforce the performance based traffic steering policy across the member links. The IETF Secretariat _______________________________________________ ippm mailing list ippm@ietf.org https://www.ietf.org/mailman/listinfo/ippm From nobody Thu Feb 10 01:18:25 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B99433A0A1A for ; Thu, 10 Feb 2022 01:18:13 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 Z2xKnbBBKjql for ; Thu, 10 Feb 2022 01:18:08 -0800 (PST) Received: from frasgout.his.huawei.com 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kwepeml500004.china.huawei.com ([7.221.188.141]) with mapi id 15.01.2308.021; Thu, 10 Feb 2022 17:18:02 +0800 From: Tianran Zhou To: "guo.jun2@zte.com.cn" CC: "ippm@ietf.org" Thread-Topic: Re:[ippm] FW: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt Thread-Index: AQHYHlG/5Dl8DANZakKfNpSe9qjVHayMfvFQ Date: Thu, 10 Feb 2022 09:18:02 +0000 Message-ID: <42144b7d05d34d6c8ff168c5197bfd95@huawei.com> References: <202202101541562359727@zte.com.cn> In-Reply-To: <202202101541562359727@zte.com.cn> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.112.40.195] Content-Type: multipart/related; boundary="_004_42144b7d05d34d6c8ff168c5197bfd95huaweicom_"; type="multipart/alternative" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [ippm] FW: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP 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Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Feb 2022 17:37:04 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the IP Performance Measurement WG of the IETF. Title : Test Protocol for One-way IP Capacity Measurement Authors : Len Ciavattone Al Morton Filename : draft-ietf-ippm-capacity-protocol-00.txt Pages : 30 Date : 2022-02-10 Abstract: This memo addresses the problem of protocol support for measuring Network Capacity metrics in RFC 9097, where the method deploys a feedback channel from the receiver to control the sender's transmission rate in near-real-time. This memo defines a simple protocol to perform the RFC 9097 (and other) measurements. See Section 10: The authors seek feedback to determine what additional features will be necessary for an IETF Standards Track Protocol, beyond what is present in the running code available now. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ippm-capacity-protocol/ There is also an htmlized version available at: https://datatracker.ietf.org/doc/html/draft-ietf-ippm-capacity-protocol-00 Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts From nobody Thu Feb 10 09:40:10 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 022EB3A0E42 for ; Thu, 10 Feb 2022 09:40:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.299 X-Spam-Level: X-Spam-Status: No, score=-1.299 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, PDS_BTC_ID=0.5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=att.onmicrosoft.com 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 40dhdPfLUiVU for ; Thu, 10 Feb 2022 09:40:03 -0800 (PST) Received: from mx0b-00191d01.pphosted.com (mx0b-00191d01.pphosted.com [67.231.157.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D1AC43A0E4F for ; Thu, 10 Feb 2022 09:40:02 -0800 (PST) Received: from pps.filterd (m0288867.ppops.net [127.0.0.1]) by m0288867.ppops.net-00191d01. 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi R=FCdiger, [acm] Thanks for these! I've finished with your comments and submitted the 00-wg= version for chair approval... 6.2. Test Activation Request - server response {acm] now it's 6.2 Test Activation Response ... When the server sends the Test Activation response back, it SHALL set the cmd Response field to: [acm] s/response/Response/ RG: Server Test Activation Reply (or Response - please apply stringently th= rough the text) When the server responds by a Test Activation Reply, it... [acm] 1,$ s/Test Activation Reply/Test Activation Request/g ---- The server SHALL include all the test parameters again to make the client aware of any changes. RG: The server SHALL repeat all test parameters to indicate changes to the = client. [acm] good, thanks. ---- 8. Stopping the Test When the test duration timer on the server expires, it SHALL set the connection test action to STOP and also starts marking all outgoing load or status PDUs with a test action of STOP1. RG: ...and mark all outgoing load... [acm] good change, much tighter. ---- 10. Security Considerations A. Unathenticated mode (for all phases) Unauthenticated ^^^^ thx again, Al From: Ruediger.Geib@telekom.de Sent: Friday, January 28, 2022 3:51 AM To: MORTON JR., AL Cc: ippm@ietf.org Subject: Re: [ippm] draft-morton-ippm-capacity-metric-protocol Hi Al, Thanks for clarifications, I agree to your proposals. Yes, if a test running for 10 sec at line-speed can reliably only be invoke= d willingly by the party having to cope with the congested link, then an em= ergency-stop likely isn't required. Regards, Ruediger ################## Hi R=FCdiger, Thanks again for your comments! We discussed some of them at our coding project meeting today. Please see [acm] for replies. All proposals below are implemented in the working text. Al ############ Some comments: Section 3. Protocol Overview The client requires configuration of a test direction parameter (upstream or downstream test) as well as the hostname or IP address of the server in order to begin the setup and configuration exchanges with the server. RG: The draft also mentions a sender and a receiver. Both, client and serve= r may act as sender and receiver. This depends on the test direction, upstream or downstream. Words to that appear in "9. Method of Measurement", at the end of the doc. [acm] OK. Let's try this for the paragraph above: The client requires configuration of a test direction parameter (upstream or downstream test, where the client performs the role of ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sender or receiver, respectively) as well as the hostname or IP address ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ of the server in order to begin the setup and configuration exchanges with the server. 4. Stopping the Test: The server initiates the phase to stop the test by setting the STOP1 indication in load PDUs or sstatus feedback messages. ( ^^^^) RG: Would it be worth a thought to enable the client to terminate a test? [acm] This sentence in section 3 might benefit from some clarification. I added: 4. Stopping the Test: When the specified test duration has been reached, th= e server ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ initiates the phase to stop the test by setting the STOP1 indication in = load PDUs or status feedback messages. The client acknowledges by setting the= STOP2 in load PDUs or status feedback messages. ... IOW, neither the server nor the client can stop a test prematurely in norma= l operation. Note that the protocol overlays the STOP indication on existing measurement and feedback traffic. It's very simple to implement. Alternatively, a client (or server) can stop sending traffic (load PDUs or status feedback messages, depending on its role). An activity timer will expire at the opposite end, and both client and server will close the connection. The timer value can be set to expire as quickly as needed (some may be sensitive to the amount of load PDUs sent after a test appears to fail). ########## 5. Setup Request and Response Exchange The message format isn't "TLV". Is the protocol extensible (e.g. could secu= rity be adapted to future needs)? [acm] All the message formats/PDUs are extensible. A specific set of formats matc= h a protocol version number (currently 8 in the draft you reviewed). Our goal is to make version 9 and higher backward-compatible. We should be able to add fields to the PDUs and leave earlier parts untouched... ########## 6.2. Test Activation Request - server response .....The remaining 28 octets of the Test Activation Request (normally read RG: A bit worrying, seems to be set by the sender in the reply to a request= only. See editorials... [acm] Here's the full context: If the client has requested an upstream test, the server SHALL include the transmission parameters from the first row of the sending rate table= . The remaining 28 octets of the Test Activation Request (normally read from the first row of the sending rate table) are called the Sending Rate Structure, and SHALL be organized as follows: ... So, the Test Activation Response (the new name for section 6.2) uses the Sending Rate Structure to communicate a starting send rate for the test, IF the client is the sender, as in an upstream test. Perhaps we can clarify: If the client has requested an upstream test, the server SHALL include the transmission parameters from the first row of the sending rate table in the Sending Rate Structure (defined below). ########## 7.1. Test Packet PDU and Roles .... On the other hand, the test configuration MAY use a fixed sending rate requested by the client, RG: contains descriptive text about the method (e.g. decision on the sending rate). The text there certainly is correct. I wonder, whether a reference replacing the text would be sufficient? [acm] Actually, I don't see anything except protocol details near the OTOH sentence above. We can add a second clarifying sentence in the paragraph below: The client MAY communicate the desired fixed rate in its activation request. The reasons to conduct a fixed-rate test include stable measure= ment at the maximum determined by the load adjustment (search) algorithm, or the desire to test at a known subscribed rate without searching. RG: Does the MAY here introduce a new method? If it does, would that requi= re to update the RFC specifying the method? [acm] I don't think an update is necessary. We mentioned this possibility immediately, in RFC 9097 Section 2: * If a network operator is certain of the IP-Layer Capacity to be validated, then testing MAY start with a fixed-rate test at the IP-Layer Capacity and avoid activating the load adjustment algorithm. ########### 10. Security Considerations RG: would a receiver (client and host) require an "Emergency Stop" message? [acm] When would the client or server send this message? As mentioned above, either end can initiate a premature stop, and timer expiration takes care of the test termination at the opposite end. RG: If yes, should it require authentication in order to avoid an attacker from unwanted test termination? [acm] No "Emergency Stop" message, no attack. ######### RG: Would a three-way-handshake make sense to activate testing? (noting that the sender in that case also must be protected against opening of unbounded numbers of tests). A three way handshake protects against forged test set up messages. [acm] The combination of Test Setup and Test Activation define a 4-way handshake. RG: What else could be forged? [acm] everything in the current version, except the Authentication string. RG: Do these require authentication or at least a discussion? Response message feedback (indicating ramp-up/no drop where there's con= gestion or the other way around, congestion where there is none). Stop messages (unwanted termination) Could a host or a client be tricked into persistently acting as a sende= r? [acm] Yes, of course! We want to supply sufficient AUTH and integrity options whe= n needed. That's partly why we petitioned for WG Adoption, to get an early S= EC-DIR review or two. However: I have begin to think that we only need 4 security modes of operation: 1. Unauthenticated (in the protocol now) 2. Password-protected test setup (in the protocol now) 3. Encrypted Test Setup exchanges 4. Run the protocol inside an encrypted tunnel #4 will have performance implications for high capacity measurements on small hosts (in residences, GWs, WLAN devices, etc.) FYI - a client cannot be tricked into persistently acting as a sender. The command that starts the client process determines this role. ######## Editorials [acm] Thanks for these! I'll get to them in a second pass... From: ippm On= Behalf Of Ruediger.Geib@telekom.de Sent: Tuesday, December 7, 2021 3:01 AM To: marcus.ihlar=3D40ericsson.com@dmarc.ietf.org Cc: ippm@ietf.org Subject: Re: [ippm] draft-morton-ippm-capacity-metric-protocol Hi Marcus, I support adoption. Regards, Ruediger Some comments: Section 3. Protocol Overview The client requires configuration of a test direction parameter (upstream or downstream test) as well as the hostname or IP address of the server in order to begin the setup and configuration exchanges with the server. RG: The draft also mentions a sender and a receiver. Both, client and serve= r may act as sender and receiver. This depends on the test direction, upstream or downstream. Words to that appear in "9. Method of Measurement", at the end of the doc. 4. Stopping the Test: The server initiates the phase to stop the test by setting the STOP1 indication in load PDUs or sstatus feedback messages. = ( ^^^^) RG: Would it be worth a thought to enable the client to terminate a test? ########## 5. Setup Request and Response Exchange The message format isn't "TLV". Is the protocol extensible (e.g. could secu= rity be adapted to future needs)? ########## 6.2. Test Activation Request - server response .....The remaining 28 octets of the Test Activation Request (normally read RG: A bit worrying, seems to be set by the sender in the reply to a request= only. See editorials... ########## 7.1. Test Packet PDU and Roles .... On the other hand, the test configuration MAY use a fixed sending rate requested by the client, RG: contains descriptive text about the method (e.g. decision on the sendin= g rate). The text there certainly is correct. I wonder, whether a reference replacing the tex= t would be sufficient? RG: Does the MAY here introduce a new method? If it does, would that requi= re to update the RFC specifying the method? ########### 10. Security Considerations RG: would a receiver (client and host) require an "Emergency Stop" message?= If yes, should it require authentication in order to avoid an attacker fro= m unwanted test termination? Would a three-way-handshake make sense to activate testing? (noting that th= e sender in that case also must be protected against opening of unbounded n= umbers of tests). A three way handshake protects against forged test set up= messages. What else could be forged? Do these require authentication or at least a di= scussion? * Response message feedback (indicating ramp-up/no drop where there's c= ongestion or the other way around, congestion where there is none). * Stop messages (unwanted termination) * Could a host or a client be tricked into persistently acting as a sen= der? ######## Editorials 6.2. Test Activation Request - server response ... When the server sends the Test Activation response back, it SHALL set the cmd Response field to: RG: Server Test Activation Reply (or Response - please apply stringently th= rough the text) When the server responds by a Test Activation Reply, it... ---- The server SHALL include all the test parameters again to make the client aware of any changes. RG: The server SHALL repeat all test parameters to indicate changes to the = client. ---- 8. Stopping the Test When the test duration timer on the server expires, it SHALL set the connection test action to STOP and also starts marking all outgoing load or status PDUs with a test action of STOP1. RG: ...and mark all outgoing load... ---- 10. Security Considerations A. Unathenticated mode (for all phases) Unauthenticated ^^^^ Von: ippm ippm-bounces@ietf.org> Im Auftrag von Marcus Ihlar Gesendet: Montag, 6. Dezember 2021 16:53 An: ippm@ietf.org> Betreff: [ippm] draft-morton-ippm-capacity-metric-protocol Hi IPPM, This email starts an adoption call for draft-morton-ippm-capacity-metric-pr= otocol, " Test Protocol for One-way IP Capacity Measurement". This documen= t is intended for Standards Track and defines a protocol for measuring Netw= ork Capacity metrics defined in RFC 9097 (https://datatracker.ietf.org/doc/= rfc9097/<= https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/rfc9097/*3Chttp= s:/urldefense.com/v3/__https:/datatracker.ietf.org/doc/rfc9097/__;!!BhdT!0X= FagPVddMPqLtUl1ej6zNK69Ogn2sgujZ23jLU92MHMnHJnppFGox6tI3-r$*3E__;JSU!!BhdT!= 1qVUfqn2jow5EAH196PRM4gYdPZVXHWD-KBkL09K7O2c_0-Afw-glLh3PZlo$>)$>). https://datatracker.ietf.org/doc/draft-morton-ippm-capacity-metric-protocol= / https://datatracker.ietf.org/doc/html/draft-morton-ippm-capacity-metric-pro= tocol-02 This adoption call will last until Monday, December 20. Please review the d= ocument, and reply to this email thread to indicate if you think IPPM shoul= d adopt this document. BR, Marcus --_000_CH0PR02MB798042A14DCE74456A8B783AD32F9CH0PR02MB7980namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

    Hi R=FCdiger,

     

    [ac= m]

    Thanks for these!  I've finished with your comments and submitted the 00-wg version for= chair approval...

     

     

    6.2.  Test Activation Request - server response

     

    {ac= m] now it's 6.2 Test Activation Response

     

     

    …   When the server sends the Test Activation response back, it SHALL se= t

       the cmd Response field to:<= /span>

    [ac= m] s/response/Response/

     

    RG: Server Test Activation= Reply (or Response – please apply stringently through the text)=

    When the server responds b= y a Test Activation Reply, it…

    [ac= m]

    1,$ s/Test Activation Repl= y/Test Activation Request/g

    ----

     

       The server SHALL include all the test parameters again to make the

       client aware of any changes.

     

     

    RG: The server SHALL repea= t all test parameters to indicate changes to the client.<= /p>

     

    [ac= m] good, thanks.

     

    ----

     

    8.  Stopping the Test

     

       When the test duration timer on the server expires, it SHALL set the=

       connection test action to STOP and also starts marking all outgoing<= o:p>

       load or status PDUs with a test action of STOP1.

     

     

    RG: …and mark all ou= tgoing load…

     

    [ac= m] good change, much tighter.

    ----

     

    10.  Security Considerations

     

    A. Unathenticated mode (for all phases)

     

    Unauthenticated=

        ^^^^

    thx again,

    Al

     

     

     

     

    From: Ruediger.Geib@telekom.de <Ruediger.Geib@tel= ekom.de>
    Sent: Friday, January 28, 2022 3:51 AM
    To: MORTON JR., AL <acmorton@att.com>
    Cc: ippm@ietf.org
    Subject: Re: [ippm] draft-morton-ippm-capacity-metric-protocol<= /o:p>

     

    Hi Al,
     
    Thanks for clarifications, I agree to your proposals.
     
    Yes, if a test running for 10 sec at line-speed can reliably only be i=
nvoked willingly by the party having to cope with the congested link, then =
an emergency-stop likely isn’t required. 
     
    Regards,
     
    Ruediger
     
     
     
     
    ##################
     
    Hi R=FCdiger, Thanks again for your comments!
     
    We discussed some of them at our coding project meeting today.
    Please see [acm] for replies.
     
    All proposals below are implemented in the working text.

     
    

    Al
    

     
    

    ############
    

     
    

    Some comments:
    

     
    

    Section  3.  Protocol Overview
    

     
    

       The client requires configuration of a test direction par=
ameter
    

       (upstream or downstream test) as well as the hostname or =
IP address
    

       of the server in order to begin the setup and configurati=
on exchanges
    

       with the server.
    

     
    

    RG: The draft also mentions a sender and a receiver. Both, client and =
server
    

    may act as sender and receiver. This depends on the test direction,
    

    upstream or downstream.
    

     
    

    Words to that appear in "9.  Method of Measurement", at=
 the end of the doc.
    

     
    

    [acm]
    

    OK. Let's try this for the paragraph above:
    

     
    

    The client requires configuration of a test direction parameter
    

    (upstream or downstream test, where the client performs the role of
    

               &nbs=
p;            &=
nbsp;     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    

    sender or receiver, respectively) as well as the hostname or IP addres=
s
    

    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    

    of the server in order to begin the setup and configuration exchanges<=
o:p>
    

    with the server.
    

     
    

     
    

    4.  Stopping the Test: The server initiates the phase to stop the=

    

           test by setting the STOP1 indicat=
ion in load PDUs or sstatus
    

           feedback messages.  &nb=
sp;            =
            &nb=
sp;      ( ^^^^)
    

     
    

    RG: Would it be worth a thought to enable the client to terminate a te=
st?
    

     
    

    [acm]
    

    This sentence in section 3 might benefit from some clarification. I ad=
ded:
    

     
    

    4. Stopping the Test: When the specified test duration has been reache=
d, the server
    

               &nbs=
p;          ^^^^^^^^^^^^^^^^^^=
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    

       initiates the phase to stop the test by setting the STOP1=
 indication in load
    

       PDUs or status feedback messages. The client acknowledges=
 by setting the STOP2
    

       in load PDUs or status feedback messages. ...<=
/pre>

     
    

    IOW, neither the server nor the client can stop a test prematurely in =
normal
    

    operation. Note that the protocol overlays the STOP indication on exis=
ting
    

    measurement and feedback traffic. It's very simple to implement.<=
/o:p>
    

     
    

    Alternatively, a client (or server) can stop sending traffic
    

    (load PDUs or status feedback messages, depending on its role).
    

    An activity timer will expire at the opposite end, and both=

    

    client and server will close the connection. The timer value
    

    can be set to expire as quickly as needed (some may be sensitive<=
/o:p>
    

    to the amount of load PDUs sent after a test appears to fail).
    

     
    

     
    

    ##########
    

     
    

     
    

    5.  Setup Request and Response Exchange
    

     
    

     
    

    The message format isn't "TLV". Is the protocol extensible (=
e.g. could security be adapted to future needs)?
    

     
    

    [acm]
    

    All the message formats/PDUs are extensible. A specific set of formats=
 match a
    

    protocol version number (currently 8 in the draft you reviewed).<=
/o:p>
    

    Our goal is to make version 9 and higher backward-compatible.
    

    We should be able to add fields to the PDUs and leave earlier parts
    

    untouched...
    

     
    

     
    

    ##########
    

     
    

    6.2.  Test Activation Request - server response
    

     
    

    .....The remaining 28 octets of the Test Activation Request (normally =
read
    

     
    

    RG: A bit worrying, seems to be set by the sender in the reply to a re=
quest only. See editorials...
    

     
    

    [acm]
    

    Here's the full context:
    

       If the client has requested an upstream test, the server =
SHALL include
    

       the transmission parameters from the first row of the sen=
ding rate table.
    

     
    

       The remaining 28 octets of the Test Activation Request (n=
ormally read
    

       from the first row of the sending rate table) are called =
the
    

       Sending Rate Structure, and SHALL be organized as follows=
:
    

    ...
    

     
    

    So, the Test Activation Response (the new name for section 6.2)
    

    uses the Sending Rate Structure to communicate a starting send rate
    

    for the test, IF the client is the sender, as in an upstream test.
    

     
    

    Perhaps we can clarify:
    

       If the client has requested an upstream test, the server =
SHALL include
    

       the transmission parameters from the first row of the sen=
ding rate table
    

       in the Sending Rate Structure (defined below).=

    

     
    

     
    

    ##########
    

     
    

     
    

    7.1.  Test Packet PDU and Roles
    

     
    

    .... On the other hand, the test configuration MAY use a fixed sending=

    

       rate requested by the client,
    

     
    

    RG: contains descriptive text about the method (e.g. decision on the
    

    sending rate). The text there certainly is correct. I wonder, whether<=
o:p>
    

    a reference replacing the text would be sufficient?
    

     
    

    [acm]
    

    Actually, I don't see anything except protocol details near the OTOH
    

    sentence above.
    

     
    

    We can add a second clarifying sentence in the paragraph below:
    

       The client MAY communicate the desired fixed rate in its =
activation
    

       request. The reasons to conduct a fixed-rate test include=
 stable measurement
    

       at the maximum determined by the load adjustment (search)=
 algorithm,
    

       or the desire to test at a known subscribed rate without =
searching.
    

     
    

     
    

    RG:  Does the MAY here introduce a new method? If it does, would =
that require
    

    to update the RFC specifying the method?
    

     
    

    [acm]
    

    I don't think an update is necessary. We mentioned this possibility
    

    immediately, in RFC 9097 Section 2:
    

     
    

       *  If a network operator is certain of the IP-Layer =
Capacity to be
    

          validated, then testing MAY start with =
a fixed-rate test at the
    

          IP-Layer Capacity and avoid activating =
the load adjustment
    

          algorithm.
    

     
    

    ###########
    

     
    

    10.  Security Considerations
    

     
    

     
    

    RG: would a receiver (client and host) require an "Emergency Stop=
" message?
    

     
    

    [acm]
    

    When would the client or server send this message?
    

     
    

    As mentioned above, either end can initiate a premature stop, and time=
r
    

    expiration takes care of the test termination at the opposite end.
    

     
    

    RG: If yes, should it require authentication in order to avoid an atta=
cker
    

    from unwanted test termination?
    

     
    

    [acm]
    

    No "Emergency Stop" message, no attack.
    

     
    

    #########
    

     
    

     
    

    RG: Would a three-way-handshake make sense to activate testing?
    

    (noting that the sender in that case also must be protected against
    

    opening of unbounded numbers of tests). A three way handshake protects=

    

    against forged test set up messages.
    

     
    

    [acm]
    

    The combination of Test Setup and Test Activation define a 4-way hands=
hake.
    

     
    

     
    

    RG: What else could be forged?
    

    [acm] everything in the current version, except the Authentication str=
ing.
    

     
    

     
    

    RG: Do these require authentication or at least a discussion?
    

     
    

        Response message feedback (indicating ramp-up/no dr=
op where there's congestion or the other way around, congestion where there=
 is none).
    

        Stop messages (unwanted termination)

        Could a host or a client be tricked into persistent=
ly acting as a sender?
    

     
    

    [acm]
    

    Yes, of course! We want to supply sufficient AUTH and integrity option=
s when
    

    needed.  That's partly why we petitioned for WG Adoption, to get =
an early SEC-DIR
    

    review or two.
    

     
    

    However:
    

     
    

    I have begin to think that we only need 4 security modes of operation:=

    

    1. Unauthenticated (in the protocol now)
    

    2. Password-protected test setup (in the protocol now)

    3. Encrypted Test Setup exchanges
    

    4. Run the protocol inside an encrypted tunnel
    

     
    

    #4 will have performance implications for high capacity measurements
    

    on small hosts (in residences, GWs, WLAN devices, etc.)

     
    

    FYI -  a client cannot be tricked into persistently acting as a s=
ender.
    

    The command that starts the client process determines this role.<=
/o:p>
    

     
    

     
    

    ########
    

     
    

     
    

    Editorials
    

     
    

    [acm]
    

    Thanks for these!  I'll get to them in a second pass...
    

     
    

    From: ippm <ippm-bounces@ietf.org> On Behalf Of =
Ruediger.Geib@telekom.de
    

    Sent: Tuesday, December 7, 2021 3:01 AM
    

    To: ma=
rcus.ihlar=3D40ericsson.com@dmarc.ietf.org
    

    Cc: ippm@ietf.org

    Subject: Re: [ippm] draft-morton-ippm-capacity-metric-protocol
    

     
    

    Hi Marcus,
    

     
    

    I support adoption.
    

     
    

    Regards, Ruediger
    

     
    

     
    

    Some comments:
    

     
    

    Section  3.  Protocol Overview
    

     
    

       The client requires configuration of a test direction par=
ameter
    

       (upstream or downstream test) as well as the hostname or =
IP address
    

       of the server in order to begin the setup and configurati=
on exchanges
    

       with the server.
    

     
    

    RG: The draft also mentions a sender and a receiver. Both, client and =
server
    

    may act as sender and receiver. This depends on the test direction,
    

    upstream or downstream.
    

    Words to that appear in "9.  Method of Measurement", at=
 the end of the doc.
    

     
    

     
    

    4.  Stopping the Test: The server initiates the phase to stop the=

    

           test by setting the STOP1 indicat=
ion in load PDUs or sstatus
    

           feedback messages.  &nb=
sp;            =
            &nb=
sp;            =
            &nb=
sp; ( ^^^^)
    

     
    

    RG: Would it be worth a thought to enable the client to terminate a te=
st?
    

     
    

    ##########
    

     
    

    5.  Setup Request and Response Exchange
    

     
    

    The message format isn't "TLV". Is the protocol extensible (=
e.g. could security be adapted to future needs)?
    

     
    

    ##########
    

     
    

    6.2.  Test Activation Request - server response
    

     
    

    .....The remaining 28 octets of the Test Activation Request (normally =
read
    

     
    

    RG: A bit worrying, seems to be set by the sender in the reply to a re=
quest only. See editorials...
    

     
    

    ##########
    

     
    

    7.1.  Test Packet PDU and Roles
    

     
    

    .... On the other hand, the test configuration MAY use a fixed sending=

    

       rate requested by the client,
    

     
    

    RG: contains descriptive text about the method (e.g. decision on the s=
ending rate). The text
    

    there certainly is correct. I wonder, whether a reference replacing th=
e text would be sufficient?
    

     
    

    RG:  Does the MAY here introduce a new method? If it does, would =
that require to update the
    

    RFC specifying the method?
    

     
    

    ###########
    

     
    

    10.  Security Considerations
    

     
    

    RG: would a receiver (client and host) require an "Emergency Stop=
" message? If yes, should it require authentication in order to avoid =
an attacker from unwanted test termination?
    

     
    

    Would a three-way-handshake make sense to activate testing? (noting th=
at the sender in that case also must be protected against opening of unboun=
ded numbers of tests). A three way handshake protects against forged test s=
et up messages.
    

     
    

    What else could be forged? Do these require authentication or at least=
 a discussion?
    

     
    

      *   Response message feedback (indicating ramp-up/no =
drop where there's congestion or the other way around, congestion where the=
re is none).
    

      *   Stop messages (unwanted termination)

      *   Could a host or a client be tricked into persiste=
ntly acting as a sender?
    

    ########
    

     
    

     
    

    Editorials
    

     
    

    6.2.  Test Activation Request - server response
    

     
    

    ...   When the server sends the Test Activation response bac=
k, it SHALL set
    

       the cmd Response field to:
    

     
    

    RG: Server Test Activation Reply (or Response - please apply stringent=
ly through the text)
    

    When the server responds by a Test Activation Reply, it...<=
/pre>

     
    

    ----
    

     
    

       The server SHALL include all the test parameters again to=
 make the
    

       client aware of any changes.
    

     
    

    RG: The server SHALL repeat all test parameters to indicate changes to=
 the client.
    

     
    

    ----
    

     
    

    8.  Stopping the Test
    

     
    

       When the test duration timer on the server expires, it SH=
ALL set the
    

       connection test action to STOP and also starts marking al=
l outgoing
    

       load or status PDUs with a test action of STOP1.
    

     
    

    RG: ...and mark all outgoing load...
    

     
    

    ----
    

     
    

    10.  Security Considerations
    

     
    

    A. Unathenticated mode (for all phases)
    

     
    

    Unauthenticated<=
/o:p>
    

        ^^=
^^
    

     
    

    Von: ippm ipp=
m-bounces@ietf.org<mailto:ippm-bounces@ietf.org> Im Auftrag von Marcus Ihlar
    

    Gesendet: Montag, 6. =
Dezember 2021 16:53
    

    An: ippm@ietf.org<mailto:ippm@ietf.org>
    

    Betreff: [ippm] draft-morton-ippm-capacity-metric-protocol<=
/pre>

     
    

    Hi IPPM,
    

     
    

    This email starts an adoption call for draft-morton-ippm-capacity-metr=
ic-protocol, " Test Protocol for One-way IP Capacity Measurement"=
.  This document is intended for Standards Track and defines a protoco=
l for measuring Network Capacity metrics defined in RFC 9097 (https://datatr=
acker.ietf.org/doc/rfc9097/<https://urldefense.com/v3/__https:/datatrack=
er.ietf.org/doc/rfc9097/__;!!BhdT!0XFagPVddMPqLtUl1ej6zNK69Ogn2sgujZ23jLU92=
MHMnHJnppFGox6tI3-r$>)$>).
    

     
    

    h=
ttps://datatracker.ietf.org/doc/draft-morton-ippm-capacity-metric-protocol/=
<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-morto=
n-ippm-capacity-metric-protocol/__;!!BhdT!0XFagPVddMPqLtUl1ej6zNK69Ogn2sguj=
Z23jLU92MHMnHJnppFGoww_Z_IZ$>
    

    https://datatracker.ietf.org/doc/html/draft-morton-ippm-capaci=
ty-metric-protocol-02<https://urldefense.com/v3/__https:/datatracker.iet=
f.org/doc/html/draft-morton-ippm-capacity-metric-protocol-02__;!!BhdT!0XFag=
PVddMPqLtUl1ej6zNK69Ogn2sgujZ23jLU92MHMnHJnppFGo-rAHSKU$>=

    

     
    

    This adoption call will last until Monday, December 20. Please review =
the document, and reply to this email thread to indicate if you think IPPM =
should adopt this document.
    

     
    

    BR,
    

    Marcus
    

     
    

    

     
    --_000_CH0PR02MB798042A14DCE74456A8B783AD32F9CH0PR02MB7980namp_-- From nobody Fri Feb 11 01:10:25 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9641B3A0902 for ; Fri, 11 Feb 2022 01:10:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.888 X-Spam-Level: X-Spam-Status: No, score=-1.888 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=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 IGulFhOf9s3Q for ; Fri, 11 Feb 2022 01:10:14 -0800 (PST) Received: from cmccmta3.chinamobile.com (cmccmta3.chinamobile.com [221.176.66.81]) by ietfa.amsl.com (Postfix) with ESMTP id 166C73A0920 for ; Fri, 11 Feb 2022 01:10:13 -0800 (PST) Received: from spf.mail.chinamobile.com (unknown[172.16.121.1]) by rmmx-syy-dmz-app12-12012 (RichMail) with SMTP id 2eec620627f2e8b-38e4e; 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charset="UTF-8" Content-Transfer-Encoding: base64 SGkgSVBQTe+8jA0KDQpXZSBoYXZlIHVwZGF0ZWQgdHdvIGRyYWZ0cyByZWxhdGVkIHRvIG9uZS13 YXkgZGVsYXkgbWVhc3VyZW1lbnQuDQpNb3N0IG9mIHRoZSBjdXJyZW50IG9uZS13YXkgZGVsYXkg bWVhc3VyZW1lbnQgc29sdXRpb25zIHJlcXVpcmUgdGltZSBzeW5jaHJvbml6YXRpb24sIHdoaWNo IG1ha2VzIGl0IGRpZmZpY3VsdCB0byBkZXBsb3kgYXBwbGljYXRpb25zLiBTbywgd2UgaW50cm9k dWNlIHR3byBtZWFzdXJlbWVudCBzb2x1dGlvbnMgdGhhdCBkb27igJl0IHJlcXVpcmUgdGltZSBz eW5jaHJvbml6YXRpb24sIHdoaWNoIGFyZSB2YWx1YWJsZSB0byB0aGUgYXBwbGljYXRpb25zIHN1 Y2ggYXMgdmlkZW8gdHJhbnNtaXNzaW9uLCBpbmR1c3RyaWFsIGNvbnRyb2wsIGV0Yy4NCg0KTW9y ZSByZXZpZXdzIGFuZCBjb21tZW50cyBhcmUgd2VsY29tZS4gVGhlIEludGVybmV0LURyYWZ0IGFu bm91bmNlbWVudCBpcyBiZWxvdy4NCmh0dHBzOi8vd3d3LmlldGYub3JnL2FyY2hpdmUvaWQvZHJh ZnQtbGktaXBwbS1yZWYtZGVsYXktbWVhc3VyZW1lbnQtMDIudHh0IA0KaHR0cHM6Ly93d3cuaWV0 Zi5vcmcvYXJjaGl2ZS9pZC9kcmFmdC1saS1pcHBtLWRldGVybWluaXN0aWMtb3dkLW1lYXN1cmVt ZW50LTAxLnR4dCANCg0KQmVzdCBSZWdhcmRzDQpIb25nd2VpIFlhbmcNCg0KDQoNCnlhbmdob25n d2VpQGNoaW5hbW9iaWxlLmNvbSANCiANCkZyb206IGludGVybmV0LWRyYWZ0cw0KRGF0ZTogMjAy Mi0wMi0xMCAxMTozNw0KVG86IERhbnlhbmcgQ2hlbjsgSG9uZ3dlaSBZYW5nOyBUYW8gU3VuOyBZ YWxpIFdhbmc7IFlhbmcgTGkNClN1YmplY3Q6IE5ldyBWZXJzaW9uIE5vdGlmaWNhdGlvbiBmb3Ig ZHJhZnQtbGktaXBwbS1yZWYtZGVsYXktbWVhc3VyZW1lbnQtMDIudHh0DQogDQpBIG5ldyB2ZXJz aW9uIG9mIEktRCwgZHJhZnQtbGktaXBwbS1yZWYtZGVsYXktbWVhc3VyZW1lbnQtMDIudHh0DQpo YXMgYmVlbiBzdWNjZXNzZnVsbHkgc3VibWl0dGVkIGJ5IEhvbmd3ZWkgWWFuZyBhbmQgcG9zdGVk IHRvIHRoZQ0KSUVURiByZXBvc2l0b3J5Lg0KIA0KTmFtZTogZHJhZnQtbGktaXBwbS1yZWYtZGVs YXktbWVhc3VyZW1lbnQNClJldmlzaW9uOiAwMg0KVGl0bGU6IE9uZS13YXkgRGVsYXkgTWVhc3Vy ZW1lbnQgQmFzZWQgb24gUmVmZXJlbmNlIERlbGF5DQpEb2N1bWVudCBkYXRlOiAyMDIyLTAyLTEw DQpHcm91cDogSW5kaXZpZHVhbCBTdWJtaXNzaW9uDQpQYWdlczogMTANClVSTDogICAgICAgICAg ICBodHRwczovL3d3dy5pZXRmLm9yZy9hcmNoaXZlL2lkL2RyYWZ0LWxpLWlwcG0tcmVmLWRlbGF5 LW1lYXN1cmVtZW50LTAyLnR4dA0KU3RhdHVzOiAgICAgICAgIGh0dHBzOi8vZGF0YXRyYWNrZXIu aWV0Zi5vcmcvZG9jL2RyYWZ0LWxpLWlwcG0tcmVmLWRlbGF5LW1lYXN1cmVtZW50Lw0KSHRtbGl6 ZWQ6ICAgICAgIGh0dHBzOi8vZGF0YXRyYWNrZXIuaWV0Zi5vcmcvZG9jL2h0bWwvZHJhZnQtbGkt aXBwbS1yZWYtZGVsYXktbWVhc3VyZW1lbnQNCkRpZmY6ICAgICAgICAgICBodHRwczovL3d3dy5p ZXRmLm9yZy9yZmNkaWZmP3VybDI9ZHJhZnQtbGktaXBwbS1yZWYtZGVsYXktbWVhc3VyZW1lbnQt MDINCiANCkFic3RyYWN0Og0KICAgVGhlIGVuZC10by1lbmQgbmV0d29yayBvbmUtd2F5IGRlbGF5 IGlzIGFuIGltcG9ydGFudCBwZXJmb3JtYW5jZQ0KICAgbWV0cmljIGluIHRoZSA1RyBuZXR3b3Jr LiAgRm9yIHJlYWxpemluZyB0aGUgYWNjdXJhdGUgb25lLXdheSBkZWxheQ0KICAgbWVhc3VyZW1l bnQsIGV4aXN0aW5nIG1ldGhvZHMgcmVxdWlyZXMgdGhlIGVuZC10by1lbmQgZGVwbG95bWVudCBv Zg0KICAgYWNjdXJhdGUgY2xvY2sgc3luY2hyb25pemF0aW9uIG1lY2hhbmlzbSwgc3VjaCBhcyBQ VFAgb3IgR1BTLCB3aGljaA0KICAgcmVzdWx0cyBpbiByZWxhdGl2ZWx5IGhpZ2ggZGVwbG95bWVu dCBjb3N0LiAgQW5vdGhlciBtZXRob2QgY2FuDQogICBkZXJpdmUgdGhlIG9uZS13YXkgZGVsYXkg ZnJvbSB0aGUgcm91bmQtdHJpcCBkZWxheS4gIEluIHRoaXMgY2FzZSwNCiAgIHNpbmNlIHRoZSBk ZWxheSBvZiB0aGUgZG93bmxpbmsgYW5kIHVwbGluayBtYXkgYmUgYXN5bW1ldHJpYywgdGhlDQog ICBtZWFzdXJlbWVudCBhY2N1cmFjeSBpcyByZWxhdGl2ZWx5IGxvdy4gIEhlbmNlLCB0aGlzIGRv Y3VtZW50DQogICBpbnRyb2R1Y2VzIGEgbWV0aG9kIHRvIG1lYXN1cmUgdGhlIGVuZC10by1lbmQg bmV0d29yayBvbmUtd2F5IGRlbGF5DQogICBiYXNlZCBvbiBhIHJlZmVyZW5jZSBkZWxheSBndWFy YW50ZWVkIGJ5IGRldGVybWluaXN0aWMgbmV0d29ya2luZw0KICAgd2l0aG91dCBjbG9jayBzeW5j aHJvbml6YXRpb24uVGhlIGFkdmFudGFnZSBvZiB0aGlzIHNvbHV0aW9uIGlzIHRoYXQNCiAgIGl0 IGhhcyBoaWdoIG1lYXN1cmVtZW50IGFjY3VyYWN5IGFuZCBjYW4gdGVzdCBhbnkgZmxvdyB0eXBl Lg0KIA0KICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIA0KIA0KIA0KVGhlIElFVEYgU2VjcmV0YXJp YXQNCiANCiANCg== ------=_001_NextPart568108525576_=---- Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable = =0A
    Hi IPPM=EF=BC=8C

    We have updated two drafts related to one-way delay measurement.
    Most of the current= one-way delay measurement solutions require time synchronization, which m= akes it difficult to deploy applications. So, we introduce two measurement= solutions that don=E2=80=99t require time synchronization, which are valu= able to the applications such as video transmission, industrial control, e= tc.

    More reviews and comments are welcome.= The Internet-Draft announcement is below.
    =0A=

    =0A
    yanghongwei@china= mobile.com 
    =0A
     
    Dat= e: 2022-02-10 11:37
    = Subject: New Version Notification for draft-li-ippm-ref-delay-mea= surement-02.txt
     
    =0A
    A new versi= on of I-D, draft-li-ippm-ref-delay-measurement-02.txt
    =0A
    has bee= n successfully submitted by Hongwei Yang and posted to the
    =0A
    IE= TF repository.
    =0A
     
    =0A
    Name: draft-li-ippm-ref-d= elay-measurement
    =0A
    Revision: 02
    =0A
    Title: One-way De= lay Measurement Based on Reference Delay
    =0A
    Document date: 2022-= 02-10
    =0A
    Group: Individual Submission
    =0A
    Pages: 10=0A
    URL:         &nbs= p;  https://www.ietf.org/archive/id/draft-li-ippm-ref-delay-measureme= nt-02.txt
    =0A
    Status:       &n= bsp; https://datatracker.ietf.org/doc/draft-li-ippm-ref-delay-measurement/=
    =0A
    Htmlized:       https://datatr= acker.ietf.org/doc/html/draft-li-ippm-ref-delay-measurement
    =0A
    D= iff:           https://w= ww.ietf.org/rfcdiff?url2=3Ddraft-li-ippm-ref-delay-measurement-02
    =0A=
     
    =0A
    Abstract:
    =0A
       The end-to-en= d network one-way delay is an important performance
    =0A
     &nb= sp; metric in the 5G network.  For realizing the accurate one-way del= ay
    =0A
       measurement, existing methods requires the en= d-to-end deployment of
    =0A
       accurate clock synchroniz= ation mechanism, such as PTP or GPS, which
    =0A
       resul= ts in relatively high deployment cost.  Another method can
    =0A   derive the one-way delay from the round-trip delay.  = In this case,
    =0A
       since the delay of the downlink an= d uplink may be asymmetric, the
    =0A
       measurement accu= racy is relatively low.  Hence, this document
    =0A
     &nbs= p; introduces a method to measure the end-to-end network one-way delay=0A
       based on a reference delay guaranteed by determinis= tic networking
    =0A
       without clock synchronization.The= advantage of this solution is that
    =0A
       it has high = measurement accuracy and can test any flow type.
    =0A
     
    = =0A
               =             &n= bsp;           &nbs= p;            =             &n= bsp;           &nbs= p;        
    =0A
     =0A
     
    =0A
    The IETF Secretariat
    =0A
     =0A
     
    =0A
    =0A ------=_001_NextPart568108525576_=------ From nobody Fri Feb 11 05:53:57 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DF4263A0EFC; Fri, 11 Feb 2022 05:53:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=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 LXYkgsUX7VuX; Fri, 11 Feb 2022 05:53:53 -0800 (PST) Received: from mta6.iomartmail.com (mta6.iomartmail.com [62.128.193.156]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1A1963A0EB8; Fri, 11 Feb 2022 05:53:49 -0800 (PST) Received: from vs3.iomartmail.com (vs3.iomartmail.com [10.12.10.124]) by mta6.iomartmail.com (8.14.7/8.14.7) with ESMTP id 21BDrleB013002; Fri, 11 Feb 2022 13:53:47 GMT Received: from vs3.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F2D734604B; Fri, 11 Feb 2022 13:53:46 +0000 (GMT) Received: from vs3.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E472B4604A; Fri, 11 Feb 2022 13:53:46 +0000 (GMT) Received: from asmtp3.iomartmail.com (unknown [10.12.10.224]) by vs3.iomartmail.com (Postfix) with ESMTPS; Fri, 11 Feb 2022 13:53:46 +0000 (GMT) Received: from LAPTOPK7AS653V ([185.69.145.139]) (authenticated bits=0) by asmtp3.iomartmail.com (8.14.7/8.14.7) with ESMTP id 21BDrjkI012867 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 11 Feb 2022 13:53:46 GMT Reply-To: From: "Adrian Farrel" To: Cc: "'IETF IPPM WG'" Date: Fri, 11 Feb 2022 13:53:44 -0000 Organization: Old Dog Consulting Message-ID: <013e01d81f4e$c9f49870$5dddc950$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Content-Language: en-gb Thread-Index: AdgfTqHA04mXeuu6RYeNAqWhYI87Ig== X-Originating-IP: 185.69.145.139 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.1.0.2090-8.6.0.1018-26708.007 X-TM-AS-Result: No--9.809-10.0-31-10 X-imss-scan-details: No--9.809-10.0-31-10 X-TMASE-Version: IMSVA-9.1.0.2090-8.6.1018-26708.007 X-TMASE-Result: 10--9.809100-10.000000 X-TMASE-MatchedRID: vTggjsizJko/9d9Rtcc0QzjNGpWCIvfTqb3/o5s+OcOzU0R+5DbDbA6W 63YXHef5s1DjnptlKr1zMoqPP9gdfsbcufj3Z2WP48SQ1JLtjzZi7WMB+JdKzhZ50KsQddqXA4e V6z+cHCezy8ybFR3tWymAx1y7V3TO9bQi0x27p1Vu2K0KSdxtGZEZHK6QPaaAsp5O052MzLpaIw ffERDGg2DYIimYuRyoJV7owmedjIX2V7leZS72wJK9FvwQx1hFTJDl9FKHbrmOsIgtFYQODW4RZ q5BvfozKw3AB667zKfjbApvORO3+6jc9XKJCqAFGUlF/M3Dxp/XJ9TQ+cQuGrobGHR5ejtrUItS uNQYAOJqc8+O2MIGuLLKHtU5vzoDPtZlIcdv/kwJWwXuYyhn/Vr2hZxjCLzqVtYy28d/67oFHa/ TMxaMW/V0k+dUwfaY7oMhxEU/K+apjpSOO6e1WW6yfYFZzrGdBXngI6jFvpfnCThanP/ghA29Ru F/Ea6vkOt2Qii5Or1STeqbcpgxams0SgWtnXgni82UiskMqcws9yCYjUR6SwRmWZt2QrlxGRoBm h+0eS1D5z4Eu8GTrO0kqSbnChsfaWPqw6Sbal4dZEkR8Y/meSyCAXe1c03kUQ+YXiZ8bitKQ+EC +8ID2Wb8oZMUwoFWxIBO056PLSqOkKYrsG6nIyyKzJY7d2nbqf/efKFN1nChpj2O74VkxL7kVdr o2lkUu+3yeZVNvjolpl5namVxtwi6D5lVGR6pc7uq4k7WFKN9LQinZ4QefL6qvLNjDYTwC+Cmxf KmwAwMyrfP9j+C1d934/rDAK3zGjFMngtLLWicA6dTiL9847TLZE5MiH7narQHZeuyYnec5KipF PC57kguqoMt3cLJeiSXZ7J6jQI= X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 Archived-At: Subject: [ippm] A review of draft-zhou-ippm-enhanced-alternate-marking-08 X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Feb 2022 13:53:56 -0000 Hi, I've just been looking at draft-ietf-6man-ipv6-alt-mark, so I thought I would also have a look at this draft. Here are a few comments that the authors may find helpful. Best, Adrian === Abstract 1. Don't use references in the Abstract 2. It would be really nice to say which enhanced capabilities and functions are provided and allowed. 3. s/the enhanced/enhanced/ --- Requirements language 1. You should move this down into section 1.1 2. You need to use the up-to-date boilerplate --- Section 1 1. s/an hybrid/a hybrid/ 2. s/IPv6 AltMark Option/The IPv6 AltMark Option/ 3. s/to the IPv6 protocol/to IPv6/ 4. s/defines Extension/defines an Extension/ 5. s/encode Alternate/encode the Alternate/ 6. s/both Hop-by-Hop/both the Hop-by-Hop/ 7. s/and Destination/and the Destination/ 8. s/carried as SRH TLV/carried as a TLV in the Segment Routing Header/ 9. You have... While the AltMark Option implements the basic alternate marking method, this document defines the extended data fields for the AltMark Option and provides the enhanced capabilities. ...I'm not clear, but I think, s/the extended/extended/ and s/the enhanced/enhanced/ But I think that the Introduction (in more detail than the Abstract) needs to give clues about those capabilities. --- Section 2 1. s/the next figure/Figure 1/ 2. s/An 8 bits/An 8-bit/ 3. It is not clear from the text that two bits of the former Reserved field remain reserved, are shown as R in the figure, and MUST continue to be set to zero on transmission and ignored on receipt. 4. s/Fig. 1:/Figure 1:/ (same for all the figures) 5. Figure 1 is slightly confusing as Section 3.1 of draft-ietf-6man-ipv6 -alt-mark shows two additional fields (Option Type and Opt Data Len) 8. Do you really need 8 bits for the NextHeader field. You have reserved 0-8 for special purposes, and used just one other value (9). At the same time you have removed 8 out of the 10 bits available for future extensions. Furthermore, 8 values looks like a lot of experimentation space. Why not... - Keep zero as reserved (for backward compatibility - by the way, you should say in the text why zero is reserved) - Reduce experimentation to the values 1, 2, 3 - Assign just 4 bits for "NextHeader" 7. I really feel that you are going to need a registry for the values of the NextHeader field. 8. s/The following figure/Figure 2/ 9. You have ... o Flag - A 4 bits flag to indicate the special purpose usage. ...It's OK, but could you add "(see below)" to save me from panic. 10. s/A 4 bits flag/A 4-bit flag/ 11. For Len ("It indicates the length of extension headers.") you need to say what is counted and in what units. Do you start at FlowMonID Ext or after Padding? Do you count in octets or double words? 12. s/A 16 bits Bitmap/A 16-bit bitmap/ 13. To be clear, is the padding there specifically as padding, or is a reserved field? What does "when not being used" mean? Looking later I think that you only have padding present sometimes, so it is genuinely padding, but the text does not explain when it is there and when it isn't. 14. s/requested to set/requested to be set/ 15. Similarly for MetaInfo, could you add "(see below)"? 16. s/The Flag is defined as/The Flag is defined in Figure 3 as/ 17. OLD others - Reserved. NEW others (shown as R) - Reserved. MUST be set to zero and ignored on receipt. END 18. s/as a bit map as follows:/in Figure 4 as a bit map as follows:/ 19. I read "stands for the second part" several times before I realised you mean "stands of the number of seconds in the timestamp" and not "the second part of the timestamp"! 20. I see that various pieces of information are present if a particular bit in the bitmap is set. But you don't talk about whether that information must be ordered according to the order of the bits (of course it must be). 21. Figure 6 shows Control as a 6-bit field and Period as a 10-bit field. If this is an error, fix the figure. If it is intentional please make it clear in the text. 22. How are the various fields of the control information extension used? I feel you may be missing some reference pointers. 23. What is the sequence number used for? --- Section 3. In particular the fundamental security requirement is that Alternate Marking MUST be applied in a specific limited domain, as also mentioned in [RFC8799]. It's subtle, but I think you don't mean that it MUST be applied in a specific limited domain. Possibly "it MUST only be applied". From nobody Mon Feb 14 07:01:04 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7DED33A0FCB; Mon, 14 Feb 2022 07:01:02 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.197 X-Spam-Level: X-Spam-Status: No, score=-4.197 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=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 KNQ2jg5TFS46; Mon, 14 Feb 2022 07:00:58 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CFA8F3A0FC6; Mon, 14 Feb 2022 07:00:57 -0800 (PST) Received: from fraeml712-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Jy6pp4tMRz6H6vG; Mon, 14 Feb 2022 23:00:34 +0800 (CST) Received: from fraeml714-chm.china.huawei.com (10.206.15.33) by fraeml712-chm.china.huawei.com (10.206.15.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 14 Feb 2022 16:00:53 +0100 Received: from fraeml714-chm.china.huawei.com ([10.206.15.33]) by fraeml714-chm.china.huawei.com ([10.206.15.33]) with mapi id 15.01.2308.021; Mon, 14 Feb 2022 16:00:53 +0100 From: Giuseppe Fioccola To: "adrian@olddog.co.uk" , "draft-zhou-ippm-enhanced-alternate-marking@ietf.org" CC: 'IETF IPPM WG' Thread-Topic: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Thread-Index: AdgfTqHA04mXeuu6RYeNAqWhYI87IgCNetXw Date: Mon, 14 Feb 2022 15:00:53 +0000 Message-ID: References: <013e01d81f4e$c9f49870$5dddc950$@olddog.co.uk> In-Reply-To: <013e01d81f4e$c9f49870$5dddc950$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.48.213.128] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [ippm] A review of draft-zhou-ippm-enhanced-alternate-marking-08 X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Feb 2022 15:01:03 -0000 Hi Adrian, Thanks a lot for your thorough revision.=20 It will help to improve the document and we plan to publish the new revisio= n soon. Please find my responses inline as [GF]. Best Regards, Giuseppe -----Original Message----- From: Adrian Farrel =20 Sent: Friday, February 11, 2022 2:54 PM To: draft-zhou-ippm-enhanced-alternate-marking@ietf.org Cc: 'IETF IPPM WG' Subject: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Hi, I've just been looking at draft-ietf-6man-ipv6-alt-mark, so I thought I wou= ld also have a look at this draft. Here are a few comments that the authors may find helpful. Best, Adrian =3D=3D=3D Abstract 1. Don't use references in the Abstract 2. It would be really nice to say which enhanced capabilities and functions are provided and allowed. 3. s/the enhanced/enhanced/ [GF]: Sure, I will apply these changes and specify what are the enhanced ca= pabilities, for example thicker packet loss measurements and more dense del= ay measurements with no limitation for the number of concurrent flows under= monitoring --- Requirements language 1. You should move this down into section 1.1 2. You need to use the up-to-= date boilerplate [GF]: Yes, we will do. --- Section 1 1. s/an hybrid/a hybrid/ 2. s/IPv6 AltMark Option/The IPv6 AltMark Option/ 3. s/to the IPv6 protocol= /to IPv6/ 4. s/defines Extension/defines an Extension/ 5. s/encode Alternat= e/encode the Alternate/ 6. s/both Hop-by-Hop/both the Hop-by-Hop/ 7. s/and = Destination/and the Destination/ 8. s/carried as SRH TLV/carried as a TLV i= n the Segment Routing Header/ [GF]: We will include these changes. 9. You have... While the AltMark Option implements the basic alternate marking method, this document defines the extended data fields for the AltMark Option and provides the enhanced capabilities. ...I'm not clear, but I think, s/the extended/extended/ and s/the enhanced/enhanced/ But I think that the Introduction (in more detail than the Abstract)=20 needs to give clues about those capabilities. [GF]: We will apply the suggested changes. I agree that more detailed infor= mation about the enhanced capabilities can be included in the Introduction. --- Section 2 1. s/the next figure/Figure 1/ 2. s/An 8 bits/An 8-bit/ [GF]: We will include these changes. 3. It is not clear from the text that two bits of the former Reserved field remain reserved, are shown as R in the figure, and MUST continue to be set to zero on transmission and ignored on receipt. [GF]: We will clarify this point. 4. s/Fig. 1:/Figure 1:/ (same for all the figures) [GF]: Yes. 5. Figure 1 is slightly confusing as Section 3.1 of draft-ietf-6man-ipv6 -alt-mark shows two additional fields (Option Type and Opt Data Len) 8. = Do you really need 8 bits for the NextHeader field. You have reserved=20 0-8 for special purposes, and used just one other value (9). At the=20 same time you have removed 8 out of the 10 bits available for future extensions. Furthermore, 8 values looks like a lot of experimentation space. Why not... - Keep zero as reserved (for backward compatibility - by the way, you=20 should say in the text why zero is reserved) - Reduce experimentation to the values 1, 2, 3 - Assign just 4 bits for "NextHeader" [GF]: This is a good suggestion. It looks reasonable to reduce the number o= f bits for NextHeader. 7. I really feel that you are going to need a registry for the values of the NextHeader field. 8. s/The following figure/Figure 2/ [GF]: We will include these changes. 9. You have ... o Flag - A 4 bits flag to indicate the special purpose usage. ...It's OK, but could you add "(see below)" to save me from panic. [GF]: Sure, good suggestion. 10. s/A 4 bits flag/A 4-bit flag/ 11. For Len ("It indicates the length of extension headers.") you need to say what is counted and in what units. Do you start at FlowMonID Ext or after Padding? Do you count in octets or double words? 12. s/A 16 bits Bitmap/A 16-bit bitmap/ [GF]: We will do. 13. To be clear, is the padding there specifically as padding, or is a=20 reserved field? What does "when not being used" mean? Looking later I think that you only have padding present sometimes, so it is=20 genuinely padding, but the text does not explain when it is there and when it isn't. [GF]: We can clarify that padding is a variable length field as further spe= cify later in the document. 14. s/requested to set/requested to be set/ 15. Similarly for MetaInfo, cou= ld you add "(see below)"? 16. s/The Flag is defined as/The Flag is defined in Figure 3 as/=20 17. OLD others - Reserved. NEW others (shown as R) - Reserved. MUST be set to zero and ignored on receipt. END 18. s/as a bit map as follows:/in Figure 4 as a bit map as follows:/=20 [GF]: We will apply these changes. 19. I read "stands for the second part" several times before I realised you mean "stands of the number of seconds in the timestamp" and not "the second part of the timestamp"! [GF]: We will revise the text. 20. I see that various pieces of information are present if a particular bit in the bitmap is set. But you don't talk about whether that=20 information must be ordered according to the order of the bits (of course it must be). [GF]: Yes, we will clarify this point. 21. Figure 6 shows Control as a 6-bit field and Period as a 10-bit=20 field. If this is an error, fix the figure. If it is intentional please make it clear in the text. [GF]: We will further clarify this part. 22. How are the various fields of the control information extension=20 used? I feel you may be missing some reference pointers. 23. What is the sequence number used for? [GF]: We will add further details here. --- Section 3. In particular the fundamental security requirement is that Alternate Marking MUST be applied in a specific limited domain, as also mentioned in [RFC8799]. It's subtle, but I think you don't mean that it MUST be applied in a specif= ic limited domain. Possibly "it MUST only be applied". [GF]: Yes, we will revise this section as well. From nobody Mon Feb 14 07:14:59 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 98AE33A102D; Mon, 14 Feb 2022 07:14:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=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 huwsZ9fKiYdy; Mon, 14 Feb 2022 07:14:51 -0800 (PST) Received: from mta7.iomartmail.com (mta7.iomartmail.com [62.128.193.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 52EF33A102A; Mon, 14 Feb 2022 07:14:49 -0800 (PST) Received: from vs1.iomartmail.com (vs1.iomartmail.com [10.12.10.121]) by mta7.iomartmail.com (8.14.7/8.14.7) with ESMTP id 21EFESUi015987; Mon, 14 Feb 2022 15:14:28 GMT Received: from vs1.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8D6A246056; Mon, 14 Feb 2022 15:14:28 +0000 (GMT) Received: from vs1.iomartmail.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8132446054; Mon, 14 Feb 2022 15:14:28 +0000 (GMT) Received: from asmtp2.iomartmail.com (unknown [10.12.10.249]) by vs1.iomartmail.com (Postfix) with ESMTPS; Mon, 14 Feb 2022 15:14:28 +0000 (GMT) Received: from LAPTOPK7AS653V ([85.255.233.48]) (authenticated bits=0) by asmtp2.iomartmail.com (8.14.7/8.14.7) with ESMTP id 21EFEQ47011740 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 14 Feb 2022 15:14:27 GMT Reply-To: From: "Adrian Farrel" To: "'Giuseppe Fioccola'" , Cc: "'IETF IPPM WG'" References: <013e01d81f4e$c9f49870$5dddc950$@olddog.co.uk> In-Reply-To: Date: Mon, 14 Feb 2022 15:14:27 -0000 Organization: Old Dog Consulting Message-ID: <034a01d821b5$8fe16460$afa42d20$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Content-Language: en-gb Thread-Index: AQI6Mg6mUyySe4g6eC2FlzH7bFymcwIBauOhq777fHA= X-Originating-IP: 85.255.233.48 X-Thinkmail-Auth: adrian@olddog.co.uk X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSVA-9.1.0.2090-8.6.0.1018-26716.000 X-TM-AS-Result: No--25.967-10.0-31-10 X-imss-scan-details: No--25.967-10.0-31-10 X-TMASE-Version: IMSVA-9.1.0.2090-8.6.1018-26716.000 X-TMASE-Result: 10--25.967300-10.000000 X-TMASE-MatchedRID: z5DqD3Ob673xIbpQ8BhdbI61Z+HJnvsOUd7Bjfo+5jQDL/Bz1s2ai2Z4 IsTaK7XgE3r+n32a9SVakcaN0kYenIKsC92uhkQmvHKClHGjjr1Ers9MdsHhEm82zvsXichaoLe GyPisKp0RkzDa1jgzf5+nBagEn8npTeDXE9iDua7zwi6hmzCfv5CgGv5IWd4kKfzIdqY/M83jeZ jRsqsX6uRVZqdflsgEuHeb/QQJM7ZNMVgfENs1qtyBRU/cKn6983jZNP+ERge3lIo0YTJv4Efl+ H4+MqTJ+/iNTuJDw/vZ5nzC46YpxTnHgzGpejvHcCpWIzs12NX4h+uI7dxXxFh+wccOAAwjXFTH o1zeSS87ILyVWaVXe6akhRUrk3zcx1cQcyP+geMfuiiOOXntlQTHaede/M0j4NOWTIgITWYX6MB XkDmvQ3LH5w7bl52jhEPvZZ6GidvqpBsglQNyraoXHZz/dXlxyUMAPEFj6NoGb1/tL3ggnGNl/V TJ+jvpPsj5qjS+dCGo/56eWHaCUwYU8o3sAyqyHuEs048UVaIF70qnzbeUGB9oEkuuWUr1wNhVN LRAQcAw1PYcQ48wS5+lLx92IzG55UcZtwNsCro5f9Xw/xqKXcidYBYDjITpi2QFaYS1v20qtq5d 3cxkNfAxRSAc0OENIuJieNVvzvp+3BndfXUhXQ== X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 Archived-At: Subject: Re: [ippm] A review of draft-zhou-ippm-enhanced-alternate-marking-08 X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Feb 2022 15:14:57 -0000 Thanks Giuseppe, All looks good. Adrian -----Original Message----- From: Giuseppe Fioccola Sent: 14 February 2022 15:01 To: adrian@olddog.co.uk; draft-zhou-ippm-enhanced-alternate-marking@ietf.org Cc: 'IETF IPPM WG' Subject: RE: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Hi Adrian, Thanks a lot for your thorough revision. It will help to improve the document and we plan to publish the new revision soon. Please find my responses inline as [GF]. Best Regards, Giuseppe -----Original Message----- From: Adrian Farrel Sent: Friday, February 11, 2022 2:54 PM To: draft-zhou-ippm-enhanced-alternate-marking@ietf.org Cc: 'IETF IPPM WG' Subject: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Hi, I've just been looking at draft-ietf-6man-ipv6-alt-mark, so I thought I would also have a look at this draft. Here are a few comments that the authors may find helpful. Best, Adrian === Abstract 1. Don't use references in the Abstract 2. It would be really nice to say which enhanced capabilities and functions are provided and allowed. 3. s/the enhanced/enhanced/ [GF]: Sure, I will apply these changes and specify what are the enhanced capabilities, for example thicker packet loss measurements and more dense delay measurements with no limitation for the number of concurrent flows under monitoring --- Requirements language 1. You should move this down into section 1.1 2. You need to use the up-to-date boilerplate [GF]: Yes, we will do. --- Section 1 1. s/an hybrid/a hybrid/ 2. s/IPv6 AltMark Option/The IPv6 AltMark Option/ 3. s/to the IPv6 protocol/to IPv6/ 4. s/defines Extension/defines an Extension/ 5. s/encode Alternate/encode the Alternate/ 6. s/both Hop-by-Hop/both the Hop-by-Hop/ 7. s/and Destination/and the Destination/ 8. s/carried as SRH TLV/carried as a TLV in the Segment Routing Header/ [GF]: We will include these changes. 9. You have... While the AltMark Option implements the basic alternate marking method, this document defines the extended data fields for the AltMark Option and provides the enhanced capabilities. ...I'm not clear, but I think, s/the extended/extended/ and s/the enhanced/enhanced/ But I think that the Introduction (in more detail than the Abstract) needs to give clues about those capabilities. [GF]: We will apply the suggested changes. I agree that more detailed information about the enhanced capabilities can be included in the Introduction. --- Section 2 1. s/the next figure/Figure 1/ 2. s/An 8 bits/An 8-bit/ [GF]: We will include these changes. 3. It is not clear from the text that two bits of the former Reserved field remain reserved, are shown as R in the figure, and MUST continue to be set to zero on transmission and ignored on receipt. [GF]: We will clarify this point. 4. s/Fig. 1:/Figure 1:/ (same for all the figures) [GF]: Yes. 5. Figure 1 is slightly confusing as Section 3.1 of draft-ietf-6man-ipv6 -alt-mark shows two additional fields (Option Type and Opt Data Len) 8. Do you really need 8 bits for the NextHeader field. You have reserved 0-8 for special purposes, and used just one other value (9). At the same time you have removed 8 out of the 10 bits available for future extensions. Furthermore, 8 values looks like a lot of experimentation space. Why not... - Keep zero as reserved (for backward compatibility - by the way, you should say in the text why zero is reserved) - Reduce experimentation to the values 1, 2, 3 - Assign just 4 bits for "NextHeader" [GF]: This is a good suggestion. It looks reasonable to reduce the number of bits for NextHeader. 7. I really feel that you are going to need a registry for the values of the NextHeader field. 8. s/The following figure/Figure 2/ [GF]: We will include these changes. 9. You have ... o Flag - A 4 bits flag to indicate the special purpose usage. ...It's OK, but could you add "(see below)" to save me from panic. [GF]: Sure, good suggestion. 10. s/A 4 bits flag/A 4-bit flag/ 11. For Len ("It indicates the length of extension headers.") you need to say what is counted and in what units. Do you start at FlowMonID Ext or after Padding? Do you count in octets or double words? 12. s/A 16 bits Bitmap/A 16-bit bitmap/ [GF]: We will do. 13. To be clear, is the padding there specifically as padding, or is a reserved field? What does "when not being used" mean? Looking later I think that you only have padding present sometimes, so it is genuinely padding, but the text does not explain when it is there and when it isn't. [GF]: We can clarify that padding is a variable length field as further specify later in the document. 14. s/requested to set/requested to be set/ 15. Similarly for MetaInfo, could you add "(see below)"? 16. s/The Flag is defined as/The Flag is defined in Figure 3 as/ 17. OLD others - Reserved. NEW others (shown as R) - Reserved. MUST be set to zero and ignored on receipt. END 18. s/as a bit map as follows:/in Figure 4 as a bit map as follows:/ [GF]: We will apply these changes. 19. I read "stands for the second part" several times before I realised you mean "stands of the number of seconds in the timestamp" and not "the second part of the timestamp"! [GF]: We will revise the text. 20. I see that various pieces of information are present if a particular bit in the bitmap is set. But you don't talk about whether that information must be ordered according to the order of the bits (of course it must be). [GF]: Yes, we will clarify this point. 21. Figure 6 shows Control as a 6-bit field and Period as a 10-bit field. If this is an error, fix the figure. If it is intentional please make it clear in the text. [GF]: We will further clarify this part. 22. How are the various fields of the control information extension used? I feel you may be missing some reference pointers. 23. What is the sequence number used for? [GF]: We will add further details here. --- Section 3. In particular the fundamental security requirement is that Alternate Marking MUST be applied in a specific limited domain, as also mentioned in [RFC8799]. It's subtle, but I think you don't mean that it MUST be applied in a specific limited domain. Possibly "it MUST only be applied". [GF]: Yes, we will revise this section as well. 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Tue, 15 Feb 2022 16:45:54 +0000 From: Marcus Ihlar To: "ippm@ietf.org" Thread-Topic: WG Last Call for draft-ietf-ippm-ioam-ipv6-options Thread-Index: AdfzWzgRLVzROO3gTGutryPtfDbU2AvLDv9Q Date: Tue, 15 Feb 2022 16:45:54 +0000 Message-ID: References: In-Reply-To: Accept-Language: sv-SE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=ericsson.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 920f281a-66c6-4719-f7d2-08d9f0a2a213 x-ms-traffictypediagnostic: DBBPR07MB7626:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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boundary="_000_VI1PR07MB4142D5C930CF1A38FBBB28FAE2349VI1PR07MB4142eurp_" MIME-Version: 1.0 X-OriginatorOrg: ericsson.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: VI1PR07MB4142.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 920f281a-66c6-4719-f7d2-08d9f0a2a213 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Feb 2022 16:45:54.3284 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: BU+koo2MOz9SHvkpqtuxhVIdSfJvbd8qIwjKCStMQDqPFcTT49raPydYFngX1hoP9FHnsJtDYxft2jbNoXq2NIDRs7n95tn6S9V0mty4A4E= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR07MB7626 Archived-At: Subject: Re: [ippm] WG Last Call for draft-ietf-ippm-ioam-ipv6-options X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Feb 2022 16:46:05 -0000 --_000_VI1PR07MB4142D5C930CF1A38FBBB28FAE2349VI1PR07MB4142eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi IPPM, This WGLC is concluded and we see clear support for progressing the documen= t. Thanks to everyone who has contributed with feedback and to the authors for= addressing the feedback in a revision. Best regards, Marcus Ihlar From: Marcus Ihlar Sent: den 17 december 2021 16:39 To: ippm@ietf.org Subject: WG Last Call for draft-ietf-ippm-ioam-ipv6-options Hello IPPM, This email starts a Working Group Last Call on draft-ietf-ippm-ioam-ipv6-op= tions. https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-ipv6-options/ https://datatracker.ietf.org/doc/html/draft-ietf-ippm-ioam-ipv6-options-06 Please provide feedback by replying to this email with your reviews and if = you think this document is ready to progress, by Friday, January 14. Best Regards, Marcus & Tommy --_000_VI1PR07MB4142D5C930CF1A38FBBB28FAE2349VI1PR07MB4142eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

    Hi IPPM,

    This WGLC is concluded and we see clear support for = progressing the document.

    Thanks to everyone who has contributed with feedback= and to the authors for addressing the feedback in a revision.

     

    Best regards,

    Marcus Ihlar

     

    From: Marcus Ihlar
    Sent: den 17 december 2021 16:39
    To: ippm@ietf.org
    Subject: WG Last Call for draft-ietf-ippm-ioam-ipv6-options

     

    Hello IPPM,

    This email starts a Working Group Last Call on draft= -ietf-ippm-ioam-ipv6-options.

     

    https://datatracker.ietf.org/doc/draft-ietf-ipp= m-ioam-ipv6-options/

    https://datatracker.ietf.org/doc/html/dr= aft-ietf-ippm-ioam-ipv6-options-06

     

    Please provide feedback by replying to this email wi= th your reviews and if you think this document is ready to progress, by Friday, January 14.

     

    Best Regards,

    Marcus & Tommy

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    Hi Giuseppe,

    This is looking good.

    1) The one conceptual=C2=A0problem=C2=A0I'm having= is what it means for a packet to be "unmarked". If marking invol= ves encapsulation, no problem: some packets can simply not be encapsulated,= or one can omit the header option or whatever. But if it's passive mea= surement because there's a bit in the header, this bit has to be set to= something, right?=C2=A0 So how would one mediate=C2=A0between flows that a= re to be measured or not measured in the latter case?

    <= div>2) Some minor rewording of the new fragmentation language in section 4.= 4:
    OLD
    Nodes that fragment =
packets within the measurement domain MUST NOT
replicate marks, but SHOULD mark the first fragment if they have the
    <= pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;break-bef= ore:page;color:rgb(0,0,0)">capability to do so.

    NEW
    N=
odes that fragment packets within the measurement domain SHOULD, if
    they have the capability to do so, ensure that on=
ly one resulting
    fragment carries the mark=
ing bit(s) of the original packet. Failure
    to do so can introduce errors into the measurement.

    I would propose the following s= teps.

    A) address these points and publish draft-02= . We'll save the diff to show the delta between 8321 and 8321 bis.

    B) Immediately reorganize the document as you intend a= nd publish draft-03.

    Then we'll take it throug= h IETF Last Call.

    Thanks
    Martin
    =C2=A0=C2=A0
    --0000000000000c6a1705d815ad3e-- From nobody Tue Feb 15 16:10:08 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 56DE53A109E; Tue, 15 Feb 2022 16:10:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.098 X-Spam-Level: X-Spam-Status: No, score=-7.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 xBzlXvAS5gms; Tue, 15 Feb 2022 16:10:00 -0800 (PST) Received: from mail-ua1-x935.google.com (mail-ua1-x935.google.com [IPv6:2607:f8b0:4864:20::935]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3756C3A109C; Tue, 15 Feb 2022 16:09:57 -0800 (PST) Received: by mail-ua1-x935.google.com with SMTP id g15so291666uap.11; Tue, 15 Feb 2022 16:09:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to; bh=GtRc11x4BKWiYrdUSXX5CJyJZlvxCPAFJjOEXuxERdk=; b=L2zTBKqz7gR7sXEc+fSiaEu99hFbGX4fZmQcUp/C3ktctiM9v6VForm7Zmf3bnzaM+ mmxA0QrAtNEApqa40y8pEDimto1hEfeDVL4Yw2J175ItexCzErv/wV8oiBeCICRNYMu9 RfJBJ/ysc2QlVnZWgaIViNJa/aSTVBEnvVslpRaHhxj7Hgw1fqbajOlQL9LT98HQ3tY3 ke0bmo2uSQC+8KGVVSiOku3hadC8Fdw2BIAOcrBGBUoAcYnD5q4pjlxIu9hFBbZEyPAP Os8BA0U+jLFEbTU46QX7o3yv58BQ8GPUUPYDq9JPctsFiDlNVwyxdu5zal2EOOPBruTc ehkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=GtRc11x4BKWiYrdUSXX5CJyJZlvxCPAFJjOEXuxERdk=; b=hQmzQh7+B1NubYDXBQ8u/MXngqMGs1kzQYT8IdQ8yEXbIxA3wQX/HST27lrQIl2ufA J8+BKJcm3xj3aP4WE37Ivo72sM/xjsfMRMN56HIQ1jRyjAbBWXj0Rj3bGQgOLemeuxje oVURowwObmgQaxyxA+iaSRRzKDX3ttpU3yWSBxgWv8Ly4wH51HUQA1Z6nI5Wz0OnQ1fy ktLAHqvmgK5VpzuXT2NVwr0xiAyMXRriyxDsTQBtCjHo8nlK1xFH4VXtlmegwNXcQ+mQ z+cis7QzjQaXPbmWQnlHMsdqXBpuq5bLVqmq8PDsO2UuraOoWFHNjHyDnPHA18V9cOFW njyw== X-Gm-Message-State: AOAM532ZDpZa2xl36Qt2hdVYcoeNIdJozMo8Rgwi8abN1gt1HaNuBEb/ DVn+zOrXdHt465lZXVd/bMVdwOSHJkhYFfrgYRAnPIul X-Google-Smtp-Source: ABdhPJw+K2TKXzT/d3IJVadINWUrHOfh5KoPS9yL9nMCle9V+0yKJ1uPHctZfozo13JTOrJ0RMFrPjfeSp7hO51Ct88= X-Received: by 2002:a9f:23c6:0:b0:2fa:3088:eda2 with SMTP id 64-20020a9f23c6000000b002fa3088eda2mr61821uao.55.1644970195893; Tue, 15 Feb 2022 16:09:55 -0800 (PST) MIME-Version: 1.0 From: Martin Duke Date: Tue, 15 Feb 2022 16:09:43 -0800 Message-ID: To: draft-fioccola-rfc8889bis.all@ietf.org, IETF IPPM WG Content-Type: multipart/alternative; boundary="00000000000031408005d81778de" Archived-At: Subject: [ippm] AD Review #2 of RFC8889bis X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Feb 2022 00:10:06 -0000 --00000000000031408005d81778de Content-Type: text/plain; charset="UTF-8" Giuseppe, Only two new issues with this one: 1) The formula for L in section 7 is not exactly wrong, but it is very oddly expressed. (a) In 8321 you introduce the value A, which is the maximum clock skew between the two nodes. Together with the path delay, this provides the lower bound for L. In 8889, you introduce m as the maximum divergence between marking nodes, but the text says this is not clock skew but a result of the nodes being "overloaded". I don't know if overloading is a concern or not, but if it is, clearly it is an issue in the point-to-point case as well! It would be better if all skew issues -- both clock and overloading -- were brought into a single quantity A. I don't see any reason that marking nodes would have different properties than counting nodes[1], so why not use the same value? IIUC, 8321 and 8889 should have the same constraints on L -- the worst-case for clock skew is the same for both. (b) A question I don't know the answer to: is 3 standard deviations really enough in the multipoint case? If there are thousands of possible paths and a few of them are quite a bit longer, won't that introduce many errors? This isn't a single entity you're sampling, but a heterogenous set of paths. Is there a reason to think this is a normal distribution? (2) The delay measurement section is vague about one-way vs. two-way delay. Is two-way delay meaningful in a multipath environment? **** These seem like the sort of questions that would be answered by implementation and deployment experience. How do we set L? What times of delay measurement are viable? If 8889 doesn't have enough deployment to answer these questions, maybe it's not ready for PS? Martin [1] In the multipoint case, the distinction between marking nodes and egress nodes seems artificial -- the diagrams seem to envision traffic going from left to right, but of course it should be traveling in all directions! --00000000000031408005d81778de Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Giuseppe,

    Only two new issues wit= h this one:

    1) The formula for L in section 7 is not exa= ctly wrong, but it is very oddly expressed.

    (a) In= 8321 you introduce the value A, which is the maximum clock skew between th= e two nodes. Together with the path delay, this provides the lower bound fo= r L.

    In 8889, you introduce=C2=A0m as the maximum = divergence between marking nodes, but the text says this is not clock skew = but a result of the nodes being "overloaded". I don't know if= overloading is a concern or not, but if it is, clearly it is an issue in t= he point-to-point case as well!

    It would be better= if all skew issues -- both clock and overloading -- were brought into a si= ngle quantity A. I don't see any reason that marking nodes would have d= ifferent properties than counting nodes[1], so why not use the same value?<= /div>

    IIUC, 8321 and 8889 should have the same constrain= ts on L -- the worst-case for clock skew is the same for both.
    (b) A question I don't know the answer to: is 3 standard d= eviations really enough in the multipoint case? If there are thousands of p= ossible paths and a few of them are quite a bit longer, won't that intr= oduce many errors? This isn't a single entity you're sampling, but = a heterogenous set of paths. Is there a reason to think this is a normal di= stribution?

    (2) The delay measurement section is v= ague about one-way vs. two-way delay. Is two-way delay meaningful in a mult= ipath environment?

    ****

    T= hese seem like the sort of questions that would be answered by implementati= on and deployment experience. How do we set L? What times of delay measurem= ent are viable? If 8889 doesn't have enough deployment to answer these = questions, maybe it's not ready for PS?

    Martin=

    [1] In the multipoint case, the distinction=C2=A0= between marking nodes and egress nodes seems artificial -- the diagrams see= m to envision traffic going from left to right, but of course it should be = traveling in all directions!
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Tue, 15 Feb 2022 16:11:10 -0800 (PST) From: Christoph Paasch Message-id: Content-type: multipart/alternative; boundary="Apple-Mail=_DDBE5BB5-1671-4F5B-B7FB-63E8C8B0DC2D" MIME-version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\)) Date: Tue, 15 Feb 2022 16:11:06 -0800 In-reply-to: Cc: Marcus Ihlar , IETF IPPM WG To: Greg Mirsky References: <3DC3F6B6-229E-46C6-BD84-2A6A7FE6DD48@apple.com> <9340CFDA-079C-4490-A01C-EB863D365F8F@apple.com> X-Mailer: Apple Mail (2.3693.60.0.1.1) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.425, 18.0.816 definitions=2022-02-15_07:2022-02-14, 2022-02-15 signatures=0 Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Feb 2022 00:11:18 -0000 --Apple-Mail=_DDBE5BB5-1671-4F5B-B7FB-63E8C8B0DC2D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hello Greg, > On Feb 8, 2022, at 1:10 PM, Greg Mirsky wrote: >=20 > Hi Christoph, > apologies for the belated response and thank you for sharing = interesting details of you using the measurement method. I think that if = the measurement method can not only provide the Round-trip Per Minute = (RPM) metric but expose the network propagation and residential = components of the round-trip delay, then it seems to me, the scope of = the draft to be aligned with the charter of the IPPM WG and I'll be in = favor of the WG adoption of the work. > What do you think? What is the opinion of the authors and the WG? I am assuming that with "residential components" you mean the = server/client-side contribution to the measured latency, right? In that case, yes the method does allow to separate these, as = latency-probes are sent on both the load-generating connections and on = separate connections. The difference between the two represents the = "server-side contribution" to the latency. I think what would be helpful would be a section in the draft that = explains the different sources of latency (network, server, client) and = how they affect the final RPM-number and how one can separate out these = two components. It is also important to understand that the results are = highly implementation-dependent. And explaining that in this section = should help, I believe. Would that be in line with what you are looking for? Thanks, Christoph >=20 > Regards, > Greg >=20 > On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch > wrote: > Hello Greg, >=20 >> On Jan 6, 2022, at 3:00 PM, Greg Mirsky > wrote: >>=20 >> Hi Christoph, >> a happy and healthy New Year to you and All! >=20 > Happy New Year to you as well! >=20 >> Thank you for your kind consideration of my notes and detailed = responses. Please find my follow-up notes in-line below under the GIM>> = tag. >=20 > Thanks for your replies. Please see inline: >=20 >> On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch > wrote: >> Hello Greg, >>=20 >> thanks for your comments. Please see inline: >>=20 >>> On Dec 22, 2021, at 11:43 PM, Greg Mirsky > wrote: >>>=20 >>> Dear Marcus, Authors, et al, >>> apologies for the belated response. >>> I've read the draft and have some comments to share with you: >>> as I understand it, the proposed new responsiveness metric is viewed = as the single indicator of a bufferbloat condition in a network. As I = recall, the discussion at Measuring Network Quality for End-Users = workshop and on the mailing list = indicated, that there=E2=80=99s = no consensus on what behaviors, symptoms can reliably signal the = bufferbloat. >> We are not trying for this responsiveness metric to be "the single = indicator of bufferbloat". Bufferbloat can be measured in many different = number of ways. And each of these will produce a correct, but a = different result. Thus, "bufferbloat" is whatever the methodology tries = to detect. >>=20 >> Let me give an example of two methodologies that are both correct but = both will produce entirely different numbers : >>=20 >> If we would decide to generate the load by flooding the network with = UDP traffic from a specific 4-tuple and measure latency with parallel = ICMP pings. Then, on a over-buffered FIFO queue we would measure huge = latencies (thus correctly expose bufferbloat), while on a FQ-codel queue = we would not measure any bufferbloat. >>=20 >> If on the other hand, the load-generating traffic is changing the = source-port for every single UDP-packet, then in both the FIFO-queue and = the FQ-codel queue we will measure huge amounts of bufferbloat. >>=20 >> Thus, these two methods both produced correct results but with hugely = different numbers in the FQ-codel case. [1] >>=20 >> Now, while both methods measure some variant of bufferbloat, they = both don't measure a realistic usage of the network. >> GIM>> Thank you for the insights. It seems to me that what the method = can demonstrate is rather the level of efficiency of the AQM in the = network for a particular class of applications. >=20 > Yes, that is a good description. It is for a "particular class of = applications" and we are trying to make this class of applications = representative of a "typical user-scenario". (admittedly, we can debate = forever on what kind of applications are representative and I would love = to have that debate :-)). >=20 > On the point of "efficiency of the AQM". I would go even further that = it's not only AQM but also the client- and server-side implementations = of these applications (as noted further below). >=20 >=20 >>=20 >>=20 >> That is why the "Responsiveness under working conditions" tries to = clearly specify how the load is generated and how the latency is being = measured. And it does not measure "bufferbloat" but it measures = "responsiveness under working conditions" based on the methodology that = is being used (using HTTP/2 or HTTP/3, multiple flows, ...). It does = expose bufferbloat which can happen in the network. It also exposes = certain server-side behaviors that can cause (huge amounts of) = additional latency - those behaviors are typically not called = "bufferbloat". >> GIM>> Thank you for pointing out that the result of the RTT = measurement has two contributing factors - network and server. >=20 > Yes, servers contribute as do the client-side implementations. It's = all three (client, network, server) that need to work "correctly" to = achieve good responsiveness. Btw., as we are now gathering more = experience with our methodology in different environments we find that = the biggest portions of latency actually come from the server-side. We = see several seconds of latency introduced by the HTTP/2 and TCP = implementations. >=20 >> It seems worth enhancing the method to localize each contribution and = measure them separately. >=20 > With the latency measuring probes being sent on load-bearing = connections and separate connections and with the separate connections = serving to measure DNS/TCP/... individually, the different data-points = actually allow to localize to some extend. >=20 > However, I would be reluctant to dive too deep into = localization/trouble-shooting/debugging of networks as part of this I-D. = As this opens a whole new can of worms. We could then start thinking = about sending latency-probes while playing with the IP TTL to find which = router is introducing the latency,... It's an entirely different = research-topic IMO :-) Dave Taht was thinking of starting something = along these lines (https://github.com/dtaht/wtbb = ). >=20 >>> It seems that it would be reasonable to first define what is being = measured, characterized by the responsiveness metric. Having a document = that discusses and defines the bufferbloat would be great. >> I agree that there is a lack of definition for what "bufferbloat" = really is. >>=20 >> The way we look at "responsiveness under working conditions" is that = it measures the latency in conditions that may realistically happen in = worst-case scenarios with end-users/implementations that are = non-malicious (non-malicious to exclude the UDP-flooding scenario). >>=20 >> Thus, I assume we should make a better job at explaining this. The = lack of a formal definition of "bufferbloat" doesn't help and thus we = are indeed using this term a bit freely in the current draft. We will = improve the Introduction to better set the stage = (https://github.com/network-quality/draft-cpaasch-ippm-responsiveness/issu= es/31 = ). >>=20 >>> It seems like in the foundation of the methodology described in the = draft lies the assumption that without adding new flows the available = bandwidth is constant, does not change. While that is mostly the case, = there are technologies that behave differently and may change bandwidth = because of the outside conditions. Some of these behaviors of links with = variable discrete bandwidth are discussed in, for example, RFC 8330 = and RFC 8625 = . >> I'm not sure I entirely understand your comment. But let me explain = why we are gradually adding new flows: >>=20 >> 1. TCP-implementations have usually a fixed limit for the upper bound = of the receive window. In some networks that upper bound is lower than = the BDP of the network. Thus, the only way to reach full capacity is by = having multiple flows. >> 2. Having multiple connections allows to quicker achieve full = capacity in high-RTT networks and thus speeds up the test-duration. >> 3. In some networks with "random" packet-loss, congestion-control may = come in the way of achieving full capacity. Again, multiple flows will = work around that. >> GIM>> I might have asked several questions at once. Let me clarify = what I am looking for: >> As I understand the method of creating the "working conditions in a = network" is based on certain assumptions. First, seems is that the = bandwidth is symmetrical between the measurement points. Second, that = the bandwidth doesn't change for the duration of the measurement = session. AFAIK, in the access networks, both are not necessarily always = the case. > We don't have the assumption that bandwidth is symmetrical (assuming, = you mean uplink/downlink symmetry - please clarify otherwise). >=20 > The load-generating algorithm runs independently for uplink and = downlink traffic. And it is perfectly fine when both have huge = asymmetry. >=20 >=20 > Regarding the stability of the bandwidth: > You are making a good point indeed that we assume that the bandwidth = is to some extend stable while ramping up the flows to "working = conditions". Admittedly that assumption does not always hold, and that = is one of the reasons why we try hard for the test to not take too long. > I'm not sure how we could adjust the algorithm for varying bandwidth = without introducing too much complexity. I'm open for suggestions :-) >> On the other hand, I might have missed how the method of creating the = "working conditions" guarantees a symmetrical load between the = measurement points. > As mentioned above, we don't assume a symmetrical load. Can you show = us where in the draft we give that impression, so we can fix that? >=20 >>>=20 >>> Then, I find the motivation not to use time units to express the = responsiveness metric not convincing: >>> "Latency" is a poor measure of responsiveness, since it can be = hard >>> for the general public to understand. The units are unfamiliar >>> ("what is a millisecond?") and counterintuitive ("100 msec - that >>> sounds good - it's only a tenth of a second!"). >>=20 >> Can you expand on what exactly is not convincing to you? Do you think = that people will mis-understand the metric or that milli-seconds is the = right way to communicate responsiveness to the general public? >> GIM>> Let me try. We know packet delay requirements for AR, VR = applications. I believe that gamers are familiar with these numbers too. = The same is likely the case for the industrial automation use cases = served, for example, by Deterministic Networking. >=20 > I can understand that for a technical audience, milli-seconds is easy = and familiar. A non-technical audience might be more open to accepting a = new "higher-is-better" metric. Responsiveness is something new and = abstract so, it's kind of natural that it comes with a new unit. >=20 > But I fully recognize that that's a controversial topic and can be = discussed at length :) >=20 >=20 > Cheers, > Christoph >=20 >>=20 >>=20 >> Thanks a lot, >> Christoph >>=20 >> [1] And there are many networks that prioritize ICMP pings, thus we = could observe even more different results based on what protocol is used = to measure the latency. >>=20 >>>=20 >>> On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar = > wrote: >>> Hi IPPM, >>>=20 >>> =20 >>>=20 >>> This email starts an adoption call for = draft-cpaasch-ippm-responsiveness, "Responsiveness under Working = Conditions=E2=80=9D. This document specifies the =E2=80=9CRPM Test=E2=80=9D= for measuring user experience when the network is fully loaded. The = intended status of the document is Experimental. =20 >>>=20 >>> =20 >>>=20 >>> https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/ = >>> = https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-responsiveness-01= = >>> =20 >>>=20 >>> This adoption call will last until Monday, December 20. Please = review the document, and reply to this email thread to indicate if you = think IPPM should adopt this document. >>>=20 >>> =20 >>>=20 >>> BR, >>>=20 >>> Marcus >>>=20 >>> =20 >>>=20 >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm = >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm = >>=20 >=20 --Apple-Mail=_DDBE5BB5-1671-4F5B-B7FB-63E8C8B0DC2D Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hello= Greg,

    On Feb 8, 2022, at 1:10 PM, Greg Mirsky = <gregimirsky@gmail.com> wrote:

    Hi Christoph,
    apologies for the belated response and thank you for sharing = interesting details of you using the measurement method. I think that if = the measurement method can not only provide the Round-trip Per = Minute (RPM) metric but expose the network propagation and residential = components of the round-trip delay, then it seems to me, the scope of = the draft to be aligned with the charter of the IPPM WG and I'll be in = favor of the WG adoption of the work.
    What do = you think? What is the opinion of the authors and the = WG?

    I = am assuming that with "residential components" you mean the = server/client-side contribution to the measured latency, = right?

    In that case, yes the method = does allow to separate these, as latency-probes are sent on both the = load-generating connections and on separate connections. The difference = between the two represents the "server-side contribution" to the = latency.

    I think what would be = helpful would be a section in the draft that explains the different = sources of latency (network, server, client) and how they affect the = final RPM-number and how one can separate out these two components. It = is also important to understand that the results are highly = implementation-dependent. And explaining that in this section should = help, I believe.

    Would that be in = line with what you are looking for?


    Thanks,
    Christoph



    Regards,
    Greg

    On Thu, Jan 6, 2022 at 4:42 PM = Christoph Paasch <cpaasch@apple.com> wrote:
    Hello Greg,

    On Jan = 6, 2022, at 3:00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

    Hi Christoph,
    a happy and healthy = New Year to you and All!

    Happy New Year to you as = well!

    Thank you for your kind = consideration of my notes and detailed responses. Please find my = follow-up notes in-line below under the GIM>> = tag.

    Thanks for your replies. Please see = inline:

    On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch = <cpaasch@apple.com> wrote:
    Hello Greg,

    thanks for your = comments. Please see inline:

    On Dec = 22, 2021, at 11:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

    Dear Marcus, Authors, = et al,
    apologies for the belated response.
    I've read the draft and have some comments to share with = you:
    • as I understand = it, the proposed new responsiveness metric is viewed as the single = indicator of a bufferbloat condition in a network. As I recall, the = discussion at Measuring Network Quality for End-Users workshop and on the mailing list indicated, that = there=E2=80=99s no consensus on what behaviors, symptoms can reliably = signal the bufferbloat. =
    We are not trying for this responsiveness metric to be "the = single indicator of bufferbloat". Bufferbloat can be measured in many = different number of ways. And each of these will produce a correct, but = a different result. Thus, "bufferbloat" is whatever the methodology = tries to detect.

    Let me give an example of two methodologies that are both = correct but both will produce entirely different numbers :

    If we would decide to = generate the load by flooding the network with UDP traffic from a = specific 4-tuple and measure latency with parallel ICMP pings. Then, on = a over-buffered FIFO queue we would measure huge latencies (thus = correctly expose bufferbloat), while on a FQ-codel queue we would not = measure any bufferbloat.

    If on the other hand, the load-generating traffic is changing = the source-port for every single UDP-packet, then in both the FIFO-queue = and the FQ-codel queue we will measure huge amounts of = bufferbloat.

    Thus, these two methods both produced correct results but = with hugely different numbers in the FQ-codel case. [1]

    Now, while both methods = measure some variant of bufferbloat, they both don't measure a realistic = usage of the network.
    GIM>> Thank you for the insights. It seems to me that = what the method can demonstrate is rather the level of efficiency of the = AQM in the network for a particular class of = applications.

    Yes, that is a good = description. It is for a "particular class of applications" and we are = trying to make this class of applications representative of a "typical = user-scenario". (admittedly, we can debate forever on what kind of = applications are representative and I would love to have that debate = :-)).

    On the = point of "efficiency of the AQM". I would go even further that it's not = only AQM but also the client- and server-side implementations of these = applications (as noted further below).




    That is why the "Responsiveness under = working conditions" tries to clearly specify how the load is generated = and how the latency is being measured. And it does not measure = "bufferbloat" but it measures "responsiveness under working conditions" = based on the methodology that is being used (using HTTP/2 or HTTP/3, = multiple flows, ...). It does expose bufferbloat which can happen in the = network. It also exposes certain server-side behaviors that can cause = (huge amounts of) additional latency - those behaviors are typically not = called "bufferbloat".
    GIM>> Thank you for pointing out that the result of the = RTT measurement has two contributing factors - network and = server.

    Yes, servers contribute as do the = client-side implementations. It's all three (client, network, server) = that need to work "correctly" to achieve good responsiveness. Btw., as = we are now gathering more experience with our methodology in different = environments we find that the biggest portions of latency actually come = from the server-side. We see several seconds of latency introduced by = the HTTP/2 and TCP implementations.

    It = seems worth enhancing the method to localize each contribution and = measure them separately.

    With the latency = measuring probes being sent on load-bearing connections and separate = connections and with the separate connections serving to measure = DNS/TCP/... individually, the different data-points actually allow to = localize to some extend.

    However, I would be reluctant to dive too deep into = localization/trouble-shooting/debugging of networks as part of this I-D. = As this opens a whole new can of worms. We could then start thinking = about sending latency-probes while playing with the IP TTL to find which = router is introducing the latency,... It's an entirely different = research-topic IMO :-) Dave Taht was thinking of starting something = along these lines (https://github.com/dtaht/wtbb).

      • It seems that = it would be reasonable to first define what is being measured, = characterized by the responsiveness metric. Having a document that = discusses and defines the bufferbloat would be = great.
      I agree that there is a lack of definition for what = "bufferbloat" really is.

      The way we look at "responsiveness under working conditions" = is that it measures the latency in conditions that may realistically = happen in worst-case scenarios with end-users/implementations that are = non-malicious (non-malicious to exclude the UDP-flooding = scenario).

      Thus,= I assume we should make a better job at explaining this. The lack of a = formal definition of "bufferbloat" doesn't help and thus we are indeed = using this term a bit freely in the current draft. We will improve the = Introduction to better set the stage (https://github.com/network-quality/draft-cpaasch-ippm-responsiv= eness/issues/31).

      • It seems like in the foundation of the methodology described = in the draft lies the assumption that without adding new flows the = available bandwidth is constant, does not change. While that = is mostly the case, there are technologies that behave differently and = may change bandwidth because of the outside conditions. Some of these = behaviors of links with variable discrete bandwidth are discussed = in, for example, RFC 8330 and RFC = 8625.
      I'm not sure I entirely understand your comment. But let me = explain why we are gradually adding new flows:

      1. TCP-implementations have usually a = fixed limit for the upper bound of the receive window. In some networks = that upper bound is lower than the BDP of the network. Thus, the only = way to reach full capacity is by having multiple flows.
      2. Having multiple connections allows to quicker achieve full = capacity in high-RTT networks and thus speeds up the = test-duration.
      3. In some networks with "random" = packet-loss, congestion-control may come in the way of achieving full = capacity. Again, multiple flows will work around = that.
      GIM>> I = might have asked several questions at once. Let me clarify what I am = looking for:
      • As I = understand the method of creating the "working conditions in a network" = is based on certain assumptions. First, seems is that the bandwidth is = symmetrical between the measurement points. Second, that the bandwidth = doesn't change for the duration of the measurement session. AFAIK, in = the access networks, both are not necessarily always the = case.
      We don't have the assumption that bandwidth is symmetrical = (assuming, you mean uplink/downlink symmetry - please clarify = otherwise).

      The = load-generating algorithm runs independently for uplink and downlink = traffic. And it is perfectly fine when both have huge = asymmetry.


      Regarding the stability of the = bandwidth:
      You are making a good point indeed that = we assume that the bandwidth is to some extend stable while ramping up = the flows to "working conditions". Admittedly that assumption does not = always hold, and that is one of the reasons why we try hard for the test = to not take too long.
      I'm not sure how we could = adjust the algorithm for varying bandwidth without introducing too much = complexity. I'm open for suggestions :-)
      • On the other hand, I might have missed how the method of = creating the "working conditions" guarantees a symmetrical load between = the measurement = points.
      As mentioned above, we don't assume a symmetrical load. Can = you show us where in the draft we give that impression, so we can fix = that?


      • Then, = I find the motivation not to use time units to express the = responsiveness metric not convincing:
         "Latency" is a poor measure of = responsiveness, since it can be hard
         for the general public to = understand.  The units are unfamiliar
         ("what is a = millisecond?") and counterintuitive ("100 msec - = that
         sounds good - it's only a tenth of a = second!").

      Can you expand on what = exactly is not convincing to you? Do you think that people will = mis-understand the metric or that milli-seconds is the right way to = communicate responsiveness to the general = public?
      GIM>> Let me = try. We know packet delay requirements for AR, VR applications. I = believe that gamers are familiar with these numbers too. The same is = likely the case for the industrial automation use cases served, for = example, by Deterministic = Networking.

      I can understand that for a technical = audience, milli-seconds is easy and familiar. A non-technical audience = might be more open to accepting a new "higher-is-better" metric. = Responsiveness is something new and abstract so, it's kind of natural = that it comes with a new unit.

      But I fully recognize that that's a = controversial topic and can be discussed at length :)


      Cheers,
      Christoph



      Thanks a lot,
      Christoph

      [1] And there are many = networks that prioritize ICMP pings, thus we could observe even more = different results based on what protocol is used to measure the = latency.


      On Mon, Dec = 6, 2021 at 7:53 AM Marcus Ihlar <marcus.ihlar=3D40ericsson.com@dmarc.ietf.org> = wrote:

      Hi IPPM,

       

      This email = starts an adoption call for draft-cpaasch-ippm-responsiveness, = "Responsiveness under Working Conditions=E2=80=9D. This document = specifies the =E2=80=9CRPM Test=E2=80=9D for measuring user experience = when the network is fully loaded. The intended status of the document is = Experimental.   

       

      https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiven= ess/

      https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-respon= siveness-01

       

      This adoption call will last until Monday, December 20. Please review the document, and = reply to this email thread to indicate if you think IPPM should adopt = this document.

       

      BR,

      Marcus

       

      _______________________________________________
      ippm mailing list
      ippm@ietf.org
      https://www.ietf.org/mailman/listinfo/ippm
      _______________________________________________
      ippm = mailing list
      ippm@ietf.org
      https://www.ietf.org/mailman/listinfo/ippm



      = --Apple-Mail=_DDBE5BB5-1671-4F5B-B7FB-63E8C8B0DC2D-- From nobody Tue Feb 15 16:34:18 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 99C533A1173 for ; Tue, 15 Feb 2022 16:34:16 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 8FRSdY2riKmf for ; Tue, 15 Feb 2022 16:34:12 -0800 (PST) Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3F8163A1171 for ; Tue, 15 Feb 2022 16:34:12 -0800 (PST) Received: by mail-ed1-x536.google.com with SMTP id b14so1070827ede.9 for ; Tue, 15 Feb 2022 16:34:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+a1VDdrA0c8hienibdx7MJLjPxuSdeR6tUx5/Gwb0+8=; b=lGCqprGSOBmgMsi/SHRliiWqowDZprhriiT5qGW2KwBaFvFWDXIzHSnxuybQYFORHB 50gc229CVS/oxYz9Qnt00ylflxFMen384nQOtUZPjtPw4bJ6QPN2O0vt+/z4OxerXfKa T1t9HhNAZtq9ZVkSQ0jNVOyHluIAjEbFO+reyhv2APHQmuqekytnxWk+9cHXqrUuIuUs rOKEsz/A8nWlcSxh94vVSP0pRUv71hvUEIa/7muTVLjGIRWR5PRSnumCaDuKKZR4R93T VqD2P9cVvdB1DmesY387KTZOrvxf3U/ejWNjw9lx2NxLNrn8100TynZZu8t4rG7ySHAD O8jQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+a1VDdrA0c8hienibdx7MJLjPxuSdeR6tUx5/Gwb0+8=; b=kqBxY4H8dok5rJpIuO/NgT+8+kgoY9ZburrQy1B49naJbl9KFqXUfJjvEHm02cIRcF 6XtulnNu7ue3Do+OgxDKtz85tvgQDgYCOphOtFcvizlZYVvNPSmGkWYNRBqRl1ZZ0lkE DA5wIyktLXQbn9OPL5gvqsYMnGN8P+dWRG2AhnrxVhKl+5csVcKu/3GKcJcB47NZKF5c k5hwHB9ULRbVmV3s1Fj5fwFXjuJPjlBs9Fb3f9xb+3lZsUmhJpr1bTONEvyqCfgmO6O0 TsPlFGYXqUS+nJbVpyiIsdzOpekxRop6ZQhB6hhMzXq5t/Vy6/68PSa6Rt4L2ktHG4m1 K0sQ== X-Gm-Message-State: AOAM532tVM912xe58JaPQLQzg4+MMajrWmq6GPp//DxBj2Ep26vqW7wU scb02dIb06JGEkFjy8C1b2WoxRQXvUXYygwANLLm+M7l X-Google-Smtp-Source: ABdhPJzTDDyOIOFI0r/oaDjgiDJR3BjTXOtMwLImuVgWr0boBDLzxnkolVKFmF9CIWZXciWIsRzIRlrZPMTD8SXF4so= X-Received: by 2002:aa7:c3d5:0:b0:40f:b885:8051 with SMTP id l21-20020aa7c3d5000000b0040fb8858051mr356023edr.395.1644971649926; Tue, 15 Feb 2022 16:34:09 -0800 (PST) MIME-Version: 1.0 References: <3DC3F6B6-229E-46C6-BD84-2A6A7FE6DD48@apple.com> <9340CFDA-079C-4490-A01C-EB863D365F8F@apple.com> In-Reply-To: From: Greg Mirsky Date: Tue, 15 Feb 2022 16:33:58 -0800 Message-ID: To: Christoph Paasch Cc: Marcus Ihlar , IETF IPPM WG Content-Type: multipart/alternative; boundary="000000000000dc078205d817ce5f" Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Feb 2022 00:34:17 -0000 --000000000000dc078205d817ce5f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Christoph, thank you for putting your thought into my comments. Your understanding is absolutely correct and the new section, as you've outlined it, would make the document even more useful to a reader. With that plan in place, I support the adoption of the draft and would help with review and comments. Regards, Greg On Tue, Feb 15, 2022 at 4:11 PM Christoph Paasch wrote: > Hello Greg, > > On Feb 8, 2022, at 1:10 PM, Greg Mirsky wrote: > > Hi Christoph, > apologies for the belated response and thank you for sharing interesting > details of you using the measurement method. I think that if the > measurement method can not only provide the Round-trip Per Minute (RPM) > metric but expose the network propagation and residential components of t= he > round-trip delay, then it seems to me, the scope of the draft to be align= ed > with the charter of the IPPM WG and I'll be in favor of the WG adoption o= f > the work. > What do you think? What is the opinion of the authors and the WG? > > > I am assuming that with "residential components" you mean the > server/client-side contribution to the measured latency, right? > > In that case, yes the method does allow to separate these, as > latency-probes are sent on both the load-generating connections and on > separate connections. The difference between the two represents the > "server-side contribution" to the latency. > > I think what would be helpful would be a section in the draft that > explains the different sources of latency (network, server, client) and h= ow > they affect the final RPM-number and how one can separate out these two > components. It is also important to understand that the results are highl= y > implementation-dependent. And explaining that in this section should help= , > I believe. > > Would that be in line with what you are looking for? > > > Thanks, > Christoph > > > > Regards, > Greg > > On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch wrote= : > >> Hello Greg, >> >> On Jan 6, 2022, at 3:00 PM, Greg Mirsky wrote: >> >> Hi Christoph, >> a happy and healthy New Year to you and All! >> >> >> Happy New Year to you as well! >> >> Thank you for your kind consideration of my notes and detailed responses= . >> Please find my follow-up notes in-line below under the GIM>> tag. >> >> >> Thanks for your replies. Please see inline: >> >> On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch >> wrote: >> >>> Hello Greg, >>> >>> thanks for your comments. Please see inline: >>> >>> On Dec 22, 2021, at 11:43 PM, Greg Mirsky wrote= : >>> >>> Dear Marcus, Authors, et al, >>> apologies for the belated response. >>> I've read the draft and have some comments to share with you: >>> >>> - as I understand it, the proposed new responsiveness metric is >>> viewed as the single indicator of a bufferbloat condition in a netwo= rk. As >>> I recall, the discussion at Measuring Network Quality for End-Users >>> workshop and on the mailing list >>> >>> indicated, that there=E2=80=99s no consensus on what behaviors, symp= toms can >>> reliably signal the bufferbloat. >>> >>> We are not trying for this responsiveness metric to be "the single >>> indicator of bufferbloat". Bufferbloat can be measured in many differen= t >>> number of ways. And each of these will produce a correct, but a differe= nt >>> result. Thus, "bufferbloat" is whatever the methodology tries to detect= . >>> >>> Let me give an example of two methodologies that are both correct but >>> both will produce entirely different numbers : >>> >>> If we would decide to generate the load by flooding the network with UD= P >>> traffic from a specific 4-tuple and measure latency with parallel ICMP >>> pings. Then, on a over-buffered FIFO queue we would measure huge latenc= ies >>> (thus correctly expose bufferbloat), while on a FQ-codel queue we would= not >>> measure any bufferbloat. >>> >>> If on the other hand, the load-generating traffic is changing the >>> source-port for every single UDP-packet, then in both the FIFO-queue an= d >>> the FQ-codel queue we will measure huge amounts of bufferbloat. >>> >>> Thus, these two methods both produced correct results but with hugely >>> different numbers in the FQ-codel case. [1] >>> >>> Now, while both methods measure some variant of bufferbloat, they both >>> don't measure a realistic usage of the network. >>> >> GIM>> Thank you for the insights. It seems to me that what the method ca= n >> demonstrate is rather the level of efficiency of the AQM in the network = for >> a particular class of applications. >> >> >> Yes, that is a good description. It is for a "particular class of >> applications" and we are trying to make this class of applications >> representative of a "typical user-scenario". (admittedly, we can debate >> forever on what kind of applications are representative and I would love= to >> have that debate :-)). >> >> On the point of "efficiency of the AQM". I would go even further that >> it's not only AQM but also the client- and server-side implementations o= f >> these applications (as noted further below). >> >> >> >>> >>> That is why the "Responsiveness under working conditions" tries to >>> clearly specify how the load is generated and how the latency is being >>> measured. And it does not measure "bufferbloat" but it measures >>> "responsiveness under working conditions" based on the methodology that= is >>> being used (using HTTP/2 or HTTP/3, multiple flows, ...). It does expos= e >>> bufferbloat which can happen in the network. It also exposes certain >>> server-side behaviors that can cause (huge amounts of) additional laten= cy - >>> those behaviors are typically not called "bufferbloat". >>> >> GIM>> Thank you for pointing out that the result of the RTT measurement >> has two contributing factors - network and server. >> >> >> Yes, servers contribute as do the client-side implementations. It's all >> three (client, network, server) that need to work "correctly" to achieve >> good responsiveness. Btw., as we are now gathering more experience with = our >> methodology in different environments we find that the biggest portions = of >> latency actually come from the server-side. We see several seconds of >> latency introduced by the HTTP/2 and TCP implementations. >> >> It seems worth enhancing the method to localize each contribution and >> measure them separately. >> >> >> With the latency measuring probes being sent on load-bearing connections >> and separate connections and with the separate connections serving to >> measure DNS/TCP/... individually, the different data-points actually all= ow >> to localize to some extend. >> >> However, I would be reluctant to dive too deep into >> localization/trouble-shooting/debugging of networks as part of this I-D.= As >> this opens a whole new can of worms. We could then start thinking about >> sending latency-probes while playing with the IP TTL to find which route= r >> is introducing the latency,... It's an entirely different research-topic >> IMO :-) Dave Taht was thinking of starting something along these lines ( >> https://github.com/dtaht/wtbb). >> >> >>> >>> >>> - It seems that it would be reasonable to first define what is being >>> measured, characterized by the responsiveness metric. Having a docum= ent >>> that discusses and defines the bufferbloat would be great. >>> >>> I agree that there is a lack of definition for what "bufferbloat" reall= y >>> is. >>> >>> The way we look at "responsiveness under working conditions" is that it >>> measures the latency in conditions that may realistically happen in >>> worst-case scenarios with end-users/implementations that are non-malici= ous >>> (non-malicious to exclude the UDP-flooding scenario). >>> >>> Thus, I assume we should make a better job at explaining this. The lack >>> of a formal definition of "bufferbloat" doesn't help and thus we are in= deed >>> using this term a bit freely in the current draft. We will improve the >>> Introduction to better set the stage ( >>> https://github.com/network-quality/draft-cpaasch-ippm-responsiveness/is= sues/31 >>> ). >>> >>> >>> - It seems like in the foundation of the methodology described in >>> the draft lies the assumption that without adding new flows the >>> available bandwidth is constant, does not change. While that is most= ly the >>> case, there are technologies that behave differently and may change >>> bandwidth because of the outside conditions. Some of these behaviors= of >>> links with variable discrete bandwidth are discussed in, for example= , RFC >>> 8330 and RFC 8625 >>> . >>> >>> I'm not sure I entirely understand your comment. But let me explain why >>> we are gradually adding new flows: >>> >>> 1. TCP-implementations have usually a fixed limit for the upper bound o= f >>> the receive window. In some networks that upper bound is lower than the= BDP >>> of the network. Thus, the only way to reach full capacity is by having >>> multiple flows. >>> 2. Having multiple connections allows to quicker achieve full capacity >>> in high-RTT networks and thus speeds up the test-duration. >>> 3. In some networks with "random" packet-loss, congestion-control may >>> come in the way of achieving full capacity. Again, multiple flows will = work >>> around that. >>> >> GIM>> I might have asked several questions at once. Let me clarify what = I >> am looking for: >> >> - As I understand the method of creating the "working conditions in a >> network" is based on certain assumptions. First, seems is that the >> bandwidth is symmetrical between the measurement points. Second, that= the >> bandwidth doesn't change for the duration of the measurement session. >> AFAIK, in the access networks, both are not necessarily always the ca= se. >> >> We don't have the assumption that bandwidth is symmetrical (assuming, yo= u >> mean uplink/downlink symmetry - please clarify otherwise). >> >> The load-generating algorithm runs independently for uplink and downlink >> traffic. And it is perfectly fine when both have huge asymmetry. >> >> >> Regarding the stability of the bandwidth: >> You are making a good point indeed that we assume that the bandwidth is >> to some extend stable while ramping up the flows to "working conditions"= . >> Admittedly that assumption does not always hold, and that is one of the >> reasons why we try hard for the test to not take too long. >> I'm not sure how we could adjust the algorithm for varying bandwidth >> without introducing too much complexity. I'm open for suggestions :-) >> >> >> - On the other hand, I might have missed how the method of creating >> the "working conditions" guarantees a symmetrical load between the >> measurement points. >> >> As mentioned above, we don't assume a symmetrical load. Can you show us >> where in the draft we give that impression, so we can fix that? >> >> >>> >>> - Then, I find the motivation not to use time units to express the >>> responsiveness metric not convincing: >>> >>> "Latency" is a poor measure of responsiveness, since it can be hard >>> for the general public to understand. The units are unfamiliar >>> ("what is a millisecond?") and counterintuitive ("100 msec - that >>> sounds good - it's only a tenth of a second!"). >>> >>> >>> Can you expand on what exactly is not convincing to you? Do you think >>> that people will mis-understand the metric or that milli-seconds is the >>> right way to communicate responsiveness to the general public? >>> >> GIM>> Let me try. We know packet delay requirements for AR, VR >> applications. I believe that gamers are familiar with these numbers too. >> The same is likely the case for the industrial automation use cases serv= ed, >> for example, by Deterministic Networking. >> >> >> I can understand that for a technical audience, milli-seconds is easy an= d >> familiar. A non-technical audience might be more open to accepting a new >> "higher-is-better" metric. Responsiveness is something new and abstract = so, >> it's kind of natural that it comes with a new unit. >> >> But I fully recognize that that's a controversial topic and can be >> discussed at length :) >> >> >> Cheers, >> Christoph >> >> >>> >>> Thanks a lot, >>> Christoph >>> >>> [1] And there are many networks that prioritize ICMP pings, thus we >>> could observe even more different results based on what protocol is use= d to >>> measure the latency. >>> >>> >>> On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar >> 40ericsson.com@dmarc.ietf.org> wrote: >>> >>>> Hi IPPM, >>>> >>>> >>>> >>>> This email starts an adoption call for >>>> draft-cpaasch-ippm-responsiveness, "Responsiveness under Working >>>> Conditions=E2=80=9D. This document specifies the =E2=80=9CRPM Test=E2= =80=9D for measuring user >>>> experience when the network is fully loaded. The intended status of th= e >>>> document is Experimental. >>>> >>>> >>>> >>>> https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/ >>>> >>>> >>>> https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-responsivenes= s-01 >>>> >>>> >>>> >>>> This adoption call will last until *Monday, December 20*. Please >>>> review the document, and reply to this email thread to indicate if you >>>> think IPPM should adopt this document. >>>> >>>> >>>> >>>> BR, >>>> >>>> Marcus >>>> >>>> >>>> _______________________________________________ >>>> ippm mailing list >>>> ippm@ietf.org >>>> https://www.ietf.org/mailman/listinfo/ippm >>>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >>> >>> >>> >> > --000000000000dc078205d817ce5f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
      Hi=C2=A0Christoph,
      thank you for putting your thought = into my comments. Your understanding is absolutely correct and the new sect= ion, as you've outlined it, would make the document even more useful to= a reader. With that plan in place, I support the adoption of the draft and= would help with review and comments.

      Regards,
      Greg

      On Tue, Feb 15, 2022 at 4:11 PM Christoph Paasch <cpaasch@apple.com> wrote:
      <= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
      Hello Greg,

      On F= eb 8, 2022, at 1:10 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

      =
      Hi Christoph,
      apologies for the belat= ed response and thank you for sharing interesting details of you using the = measurement method. I think that if the measurement method can not only pro= vide the Round-trip=C2=A0Per Minute (RPM) metric but expose the network pro= pagation and residential components of the round-trip delay, then it seems = to me, the scope of the draft to be aligned with the charter of the IPPM WG= and I'll be in favor of the WG adoption of the work.
      What=C2= =A0do you think? What is the opinion of the authors and the WG?
      =

      I am assuming that with "= residential components" you mean the server/client-side contribution t= o the measured latency, right?

      In that case, yes t= he method does allow to separate these, as latency-probes are sent on both = the load-generating connections and on separate connections. The difference= between the two represents the "server-side contribution" to the= latency.

      I think what would be helpful would be a= section in the draft that explains the different sources of latency (netwo= rk, server, client) and how they affect the final RPM-number and how one ca= n separate out these two components. It is also important to understand tha= t the results are highly implementation-dependent. And explaining that in t= his section should help, I believe.

      Would that be = in line with what you are looking for?


      <= div>Thanks,
      Christoph



      Regards,<= /div>
      Greg

      On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch <cpaasch@apple.com&g= t; wrote:
      H= ello Greg,

      On Jan 6, 2022, at 3:= 00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

      =
      Hi Christoph,
      a happy and healthy New= Year to you and All!

      Happy New Year to you as well!

      =
      Thank you for = your kind consideration of my notes and detailed responses. Please find my = follow-up notes=C2=A0in-line below under the GIM>> tag.

      Thanks for your replies. P= lease see inline:

      On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch <cpaasch@apple.com>= ; wrote:
      He= llo Greg,

      thanks for your comments. Please see inline:

      On Dec 22, 2021, at 11:43 PM, Gre= g Mirsky <gre= gimirsky@gmail.com> wrote:

      Dear Marcus, Authors, et al,apologies for the belated response.
      I've read the draft and = have some comments to share with you:
      • as I understand it,= the proposed new responsiveness metric is viewed as the single indicator o= f a bufferbloat condition in a network. As I recall,=C2=A0the discussion at= Measuring Network Quality for End-Users workshop and on the = mailing list indicated, that there=E2=80=99s no consensus on what behav= iors, symptoms can reliably signal the bufferbloat.
      <= /div>
      We are not trying for this respons= iveness metric to be "the single indicator of bufferbloat". Buffe= rbloat can be measured in many different number of ways. And each of these = will produce a correct, but a different result. Thus, "bufferbloat&quo= t; is whatever the methodology tries to detect.

      Le= t me give an example of two methodologies that are both correct but both wi= ll produce entirely different numbers :

      If we woul= d decide to generate the load by flooding the network with UDP traffic from= a specific 4-tuple and measure latency with parallel ICMP pings. Then, on = a over-buffered FIFO queue we would measure huge latencies (thus correctly = expose bufferbloat), while on a FQ-codel queue we would not measure any buf= ferbloat.

      If on the other hand, the load-generatin= g traffic is changing the source-port for every single UDP-packet, then in = both the FIFO-queue and the FQ-codel queue we will measure huge amounts of = bufferbloat.

      Thus, these two methods both produced= correct results but with hugely different numbers in the FQ-codel case. [1= ]

      Now, while both methods measure some variant of = bufferbloat, they both don't measure a realistic usage of the network.<= /div>
      GIM>> Thank you for the insi= ghts. It seems to me that what the method can demonstrate is rather the lev= el of efficiency of the AQM in the network for a particular class of applic= ations.

      Yes, = that is a good description. It is for a "particular class of applicati= ons" and we are trying to make this class of applications representati= ve of a "typical user-scenario". (admittedly, we can debate forev= er on what kind of applications are representative and I would love to have= that debate :-)).

      On the point of "efficienc= y of the AQM". I would go even further that it's not only AQM but = also the client- and server-side implementations of these applications (as = noted further below).



      That is why the "Responsiveness under working conditions&= quot; tries to clearly specify how the load is generated and how the latenc= y is being measured. And it does not measure "bufferbloat" but it= measures "responsiveness under working conditions" based on the = methodology that is being used (using HTTP/2 or HTTP/3, multiple flows, ...= ). It does expose bufferbloat which can happen in the network. It also expo= ses certain server-side behaviors that can cause (huge amounts of) addition= al latency - those behaviors are typically not called "bufferbloat&quo= t;.
      GIM>> Thank you for poin= ting out that the result of the RTT measurement has two contributing factor= s - network and server.

      =
      Yes, servers contribute as do the client-side implementations. I= t's all three (client, network, server) that need to work "correct= ly" to achieve good responsiveness. Btw., as we are now gathering more= experience with our methodology in different environments we find that the= biggest portions of latency actually come from the server-side. We see sev= eral seconds of latency introduced by the HTTP/2 and TCP implementations.
      It seems worth enhancing the method to locali= ze each contribution and measure them separately.

      With the latency measuring probes bein= g sent on load-bearing connections and separate connections and with the se= parate connections serving to measure DNS/TCP/... individually, the differe= nt data-points actually allow to localize to some extend.

      However, I would be reluctant to dive too deep into localization/tr= ouble-shooting/debugging of networks as part of this I-D. As this opens a w= hole new can of worms. We could then start thinking about sending latency-p= robes while playing with the IP TTL to find which router is introducing the= latency,... It's an entirely different research-topic IMO :-) Dave Tah= t was thinking of starting something along these lines (https://github.com/dtaht/wtbb)= .

        • It seems that it = would be reasonable to first define what is being measured, characterized= =C2=A0by the responsiveness metric. Having a document that discusses and de= fines the bufferbloat would be great.
        I agree that there is a lack of definition for wh= at "bufferbloat" really is.

        The way we l= ook at "responsiveness under working conditions" is that it measu= res the latency in conditions that may realistically happen in worst-case s= cenarios with end-users/implementations that are non-malicious (non-malicio= us to exclude the UDP-flooding scenario).

        Thus, I = assume we should make a better job at explaining this. The lack of a formal= definition of "bufferbloat" doesn't help and thus we are ind= eed using this term a bit freely in the current draft. We will improve the = Introduction to better set the stage (htt= ps://github.com/network-quality/draft-cpaasch-ippm-responsiveness/issues/31= ).

        • It seems l= ike in the foundation of the methodology described in the draft lies the as= sumption=C2=A0that without adding new flows the available=C2=A0bandwidth=C2= =A0is constant, does not change. While that is mostly the case, there are t= echnologies that behave differently and may change bandwidth because of the= outside conditions. Some of these behaviors of links with variable discret= e=C2=A0bandwidth are discussed in, for example,=C2=A0RFC 83= 30=C2=A0and RFC 8625.
        =
        I'm not sure I entirely understand = your comment. But let me explain why we are gradually adding new flows:

        1. TCP-implementations have usually a fixed limit for= the upper bound of the receive window. In some networks that upper bound i= s lower than the BDP of the network. Thus, the only way to reach full capac= ity is by having multiple flows.
        2. Having multiple connections a= llows to quicker achieve full capacity in high-RTT networks and thus speeds= up the test-duration.
        3. In some networks with "random"= ; packet-loss, congestion-control may come in the way of achieving full cap= acity. Again, multiple flows will work around that.
        =
        GIM>> I might have asked several questions at once.= Let me clarify what I am looking for:
        • As I understand th= e method of creating the "working conditions in a network" is bas= ed on certain assumptions. First, seems is that the bandwidth is symmetrica= l between the measurement points. Second, that the bandwidth doesn't ch= ange for the duration of the measurement session. AFAIK, in the access netw= orks, both are not necessarily always the case.
        =
        We don't have the assumption that bandwid= th is symmetrical (assuming, you mean uplink/downlink symmetry - please cla= rify otherwise).

        The load-generating algorithm run= s independently for uplink and downlink traffic. And it is perfectly fine w= hen both have huge asymmetry.


        Regar= ding the stability of the bandwidth:
        You are making a good point = indeed that we assume that the bandwidth is to some extend stable while ram= ping up the flows to "working conditions". Admittedly that assump= tion does not always hold, and that is one of the reasons why we try hard f= or the test to not take too long.
        I'm not sure how we could a= djust the algorithm for varying bandwidth without introducing too much comp= lexity. I'm open for suggestions :-)
          On the other hand, I might have missed how the method of creating the &quo= t;working conditions" guarantees a symmetrical load between the measur= ement points.
        As m= entioned above, we don't assume a symmetrical load. Can you show us whe= re in the draft we give that impression, so we can fix that?

        =

        • Then, I find the motivation not to use time un= its to express the responsiveness metric not convincing:
        <= div>

        Thanks a lot,
        Christoph

        [1] And there are many networks that prioritize ICMP ping= s, thus we could observe even more different results based on what protocol= is used to measure the latency.


        On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar <marcus.ihlar=3D40ericsson.com@dmarc.ietf.org> wrote:

        Hi IPPM,<= u>

        <= /u>=C2=A0

        This email starts an adoption call for draft-cpaasch-ippm-responsiven= ess, "Responsiveness under Working Conditions=E2=80=9D. This document = specifies the =E2=80=9CRPM Test=E2=80=9D for measuring user experience when= the network is fully loaded. The intended status of the document is Experiment= al. =C2=A0=C2=A0

        =C2=A0

        <= span style=3D"font-size:12pt">htt= ps://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/=

        https://datatracker.ietf.org/= doc/html/draft-cpaasch-ippm-responsiveness-01

        =C2=A0

        This adoption call will last until Monday, December 20. Please review the document, and reply to this e= mail thread to indicate if you think IPPM should adopt this document.

        =C2=A0

        BR,

        Marcus

        =C2=A0

        _______________________________________________
        ippm mailing list
        ippm@= ietf.org
        https://www.ietf.org/mailman/listinfo/ippm<= br>
        _______________________________________________
        ippm mailing list
        ippm@ietf.org
        https://= www.ietf.org/mailman/listinfo/ippm



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I filed = https://github.com/network-quality/draft-cpaasch-ippm-responsiveness/issue= s/36 = and will be working on an updated I-D for the coming weeks. Christoph > On Feb 15, 2022, at 4:33 PM, Greg Mirsky = wrote: >=20 > Hi Christoph, > thank you for putting your thought into my comments. Your = understanding is absolutely correct and the new section, as you've = outlined it, would make the document even more useful to a reader. With = that plan in place, I support the adoption of the draft and would help = with review and comments. >=20 > Regards, > Greg >=20 > On Tue, Feb 15, 2022 at 4:11 PM Christoph Paasch > wrote: > Hello Greg, >=20 >> On Feb 8, 2022, at 1:10 PM, Greg Mirsky > wrote: >>=20 >> Hi Christoph, >> apologies for the belated response and thank you for sharing = interesting details of you using the measurement method. I think that if = the measurement method can not only provide the Round-trip Per Minute = (RPM) metric but expose the network propagation and residential = components of the round-trip delay, then it seems to me, the scope of = the draft to be aligned with the charter of the IPPM WG and I'll be in = favor of the WG adoption of the work. >> What do you think? What is the opinion of the authors and the WG? >=20 > I am assuming that with "residential components" you mean the = server/client-side contribution to the measured latency, right? >=20 > In that case, yes the method does allow to separate these, as = latency-probes are sent on both the load-generating connections and on = separate connections. The difference between the two represents the = "server-side contribution" to the latency. >=20 > I think what would be helpful would be a section in the draft that = explains the different sources of latency (network, server, client) and = how they affect the final RPM-number and how one can separate out these = two components. It is also important to understand that the results are = highly implementation-dependent. And explaining that in this section = should help, I believe. >=20 > Would that be in line with what you are looking for? >=20 >=20 > Thanks, > Christoph >=20 >=20 >>=20 >> Regards, >> Greg >>=20 >> On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch > wrote: >> Hello Greg, >>=20 >>> On Jan 6, 2022, at 3:00 PM, Greg Mirsky > wrote: >>>=20 >>> Hi Christoph, >>> a happy and healthy New Year to you and All! >>=20 >> Happy New Year to you as well! >>=20 >>> Thank you for your kind consideration of my notes and detailed = responses. Please find my follow-up notes in-line below under the GIM>> = tag. >>=20 >> Thanks for your replies. Please see inline: >>=20 >>> On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch > wrote: >>> Hello Greg, >>>=20 >>> thanks for your comments. Please see inline: >>>=20 >>>> On Dec 22, 2021, at 11:43 PM, Greg Mirsky > wrote: >>>>=20 >>>> Dear Marcus, Authors, et al, >>>> apologies for the belated response. >>>> I've read the draft and have some comments to share with you: >>>> as I understand it, the proposed new responsiveness metric is = viewed as the single indicator of a bufferbloat condition in a network. = As I recall, the discussion at Measuring Network Quality for End-Users = workshop and on the mailing list = indicated, that there=E2=80=99s = no consensus on what behaviors, symptoms can reliably signal the = bufferbloat. >>> We are not trying for this responsiveness metric to be "the single = indicator of bufferbloat". Bufferbloat can be measured in many different = number of ways. And each of these will produce a correct, but a = different result. Thus, "bufferbloat" is whatever the methodology tries = to detect. >>>=20 >>> Let me give an example of two methodologies that are both correct = but both will produce entirely different numbers : >>>=20 >>> If we would decide to generate the load by flooding the network with = UDP traffic from a specific 4-tuple and measure latency with parallel = ICMP pings. Then, on a over-buffered FIFO queue we would measure huge = latencies (thus correctly expose bufferbloat), while on a FQ-codel queue = we would not measure any bufferbloat. >>>=20 >>> If on the other hand, the load-generating traffic is changing the = source-port for every single UDP-packet, then in both the FIFO-queue and = the FQ-codel queue we will measure huge amounts of bufferbloat. >>>=20 >>> Thus, these two methods both produced correct results but with = hugely different numbers in the FQ-codel case. [1] >>>=20 >>> Now, while both methods measure some variant of bufferbloat, they = both don't measure a realistic usage of the network. >>> GIM>> Thank you for the insights. It seems to me that what the = method can demonstrate is rather the level of efficiency of the AQM in = the network for a particular class of applications. >>=20 >> Yes, that is a good description. It is for a "particular class of = applications" and we are trying to make this class of applications = representative of a "typical user-scenario". (admittedly, we can debate = forever on what kind of applications are representative and I would love = to have that debate :-)). >>=20 >> On the point of "efficiency of the AQM". I would go even further that = it's not only AQM but also the client- and server-side implementations = of these applications (as noted further below). >>=20 >>=20 >>>=20 >>>=20 >>> That is why the "Responsiveness under working conditions" tries to = clearly specify how the load is generated and how the latency is being = measured. And it does not measure "bufferbloat" but it measures = "responsiveness under working conditions" based on the methodology that = is being used (using HTTP/2 or HTTP/3, multiple flows, ...). It does = expose bufferbloat which can happen in the network. It also exposes = certain server-side behaviors that can cause (huge amounts of) = additional latency - those behaviors are typically not called = "bufferbloat". >>> GIM>> Thank you for pointing out that the result of the RTT = measurement has two contributing factors - network and server. >>=20 >> Yes, servers contribute as do the client-side implementations. It's = all three (client, network, server) that need to work "correctly" to = achieve good responsiveness. Btw., as we are now gathering more = experience with our methodology in different environments we find that = the biggest portions of latency actually come from the server-side. We = see several seconds of latency introduced by the HTTP/2 and TCP = implementations. >>=20 >>> It seems worth enhancing the method to localize each contribution = and measure them separately. >>=20 >> With the latency measuring probes being sent on load-bearing = connections and separate connections and with the separate connections = serving to measure DNS/TCP/... individually, the different data-points = actually allow to localize to some extend. >>=20 >> However, I would be reluctant to dive too deep into = localization/trouble-shooting/debugging of networks as part of this I-D. = As this opens a whole new can of worms. We could then start thinking = about sending latency-probes while playing with the IP TTL to find which = router is introducing the latency,... It's an entirely different = research-topic IMO :-) Dave Taht was thinking of starting something = along these lines (https://github.com/dtaht/wtbb = ). >>=20 >>>> It seems that it would be reasonable to first define what is being = measured, characterized by the responsiveness metric. Having a document = that discusses and defines the bufferbloat would be great. >>> I agree that there is a lack of definition for what "bufferbloat" = really is. >>>=20 >>> The way we look at "responsiveness under working conditions" is that = it measures the latency in conditions that may realistically happen in = worst-case scenarios with end-users/implementations that are = non-malicious (non-malicious to exclude the UDP-flooding scenario). >>>=20 >>> Thus, I assume we should make a better job at explaining this. The = lack of a formal definition of "bufferbloat" doesn't help and thus we = are indeed using this term a bit freely in the current draft. We will = improve the Introduction to better set the stage = (https://github.com/network-quality/draft-cpaasch-ippm-responsiveness/issu= es/31 = ). >>>=20 >>>> It seems like in the foundation of the methodology described in the = draft lies the assumption that without adding new flows the available = bandwidth is constant, does not change. While that is mostly the case, = there are technologies that behave differently and may change bandwidth = because of the outside conditions. Some of these behaviors of links with = variable discrete bandwidth are discussed in, for example, RFC 8330 = and RFC 8625 = . >>> I'm not sure I entirely understand your comment. But let me explain = why we are gradually adding new flows: >>>=20 >>> 1. TCP-implementations have usually a fixed limit for the upper = bound of the receive window. In some networks that upper bound is lower = than the BDP of the network. Thus, the only way to reach full capacity = is by having multiple flows. >>> 2. Having multiple connections allows to quicker achieve full = capacity in high-RTT networks and thus speeds up the test-duration. >>> 3. In some networks with "random" packet-loss, congestion-control = may come in the way of achieving full capacity. Again, multiple flows = will work around that. >>> GIM>> I might have asked several questions at once. Let me clarify = what I am looking for: >>> As I understand the method of creating the "working conditions in a = network" is based on certain assumptions. First, seems is that the = bandwidth is symmetrical between the measurement points. Second, that = the bandwidth doesn't change for the duration of the measurement = session. AFAIK, in the access networks, both are not necessarily always = the case. >> We don't have the assumption that bandwidth is symmetrical (assuming, = you mean uplink/downlink symmetry - please clarify otherwise). >>=20 >> The load-generating algorithm runs independently for uplink and = downlink traffic. And it is perfectly fine when both have huge = asymmetry. >>=20 >>=20 >> Regarding the stability of the bandwidth: >> You are making a good point indeed that we assume that the bandwidth = is to some extend stable while ramping up the flows to "working = conditions". Admittedly that assumption does not always hold, and that = is one of the reasons why we try hard for the test to not take too long. >> I'm not sure how we could adjust the algorithm for varying bandwidth = without introducing too much complexity. I'm open for suggestions :-) >>> On the other hand, I might have missed how the method of creating = the "working conditions" guarantees a symmetrical load between the = measurement points. >> As mentioned above, we don't assume a symmetrical load. Can you show = us where in the draft we give that impression, so we can fix that? >>=20 >>>>=20 >>>> Then, I find the motivation not to use time units to express the = responsiveness metric not convincing: >>>> "Latency" is a poor measure of responsiveness, since it can be = hard >>>> for the general public to understand. The units are unfamiliar >>>> ("what is a millisecond?") and counterintuitive ("100 msec - = that >>>> sounds good - it's only a tenth of a second!"). >>>=20 >>> Can you expand on what exactly is not convincing to you? Do you = think that people will mis-understand the metric or that milli-seconds = is the right way to communicate responsiveness to the general public? >>> GIM>> Let me try. We know packet delay requirements for AR, VR = applications. I believe that gamers are familiar with these numbers too. = The same is likely the case for the industrial automation use cases = served, for example, by Deterministic Networking. >>=20 >> I can understand that for a technical audience, milli-seconds is easy = and familiar. A non-technical audience might be more open to accepting a = new "higher-is-better" metric. Responsiveness is something new and = abstract so, it's kind of natural that it comes with a new unit. >>=20 >> But I fully recognize that that's a controversial topic and can be = discussed at length :) >>=20 >>=20 >> Cheers, >> Christoph >>=20 >>>=20 >>>=20 >>> Thanks a lot, >>> Christoph >>>=20 >>> [1] And there are many networks that prioritize ICMP pings, thus we = could observe even more different results based on what protocol is used = to measure the latency. >>>=20 >>>>=20 >>>> On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar = > wrote: >>>> Hi IPPM, >>>>=20 >>>> =20 >>>>=20 >>>> This email starts an adoption call for = draft-cpaasch-ippm-responsiveness, "Responsiveness under Working = Conditions=E2=80=9D. This document specifies the =E2=80=9CRPM Test=E2=80=9D= for measuring user experience when the network is fully loaded. The = intended status of the document is Experimental. =20 >>>>=20 >>>> =20 >>>>=20 >>>> https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/ = >>>> = https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-responsiveness-01= = >>>> =20 >>>>=20 >>>> This adoption call will last until Monday, December 20. Please = review the document, and reply to this email thread to indicate if you = think IPPM should adopt this document. >>>>=20 >>>> =20 >>>>=20 >>>> BR, >>>>=20 >>>> Marcus >>>>=20 >>>> =20 >>>>=20 >>>> _______________________________________________ >>>> ippm mailing list >>>> ippm@ietf.org >>>> https://www.ietf.org/mailman/listinfo/ippm = >>>> _______________________________________________ >>>> ippm mailing list >>>> ippm@ietf.org >>>> https://www.ietf.org/mailman/listinfo/ippm = >>>=20 >>=20 >=20 --Apple-Mail=_183051AE-3B0D-46D6-AB3D-DEA4F026BFED Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Thanks a lot, Greg! I filed https://github.com/network-quality/draft-cpaasch-ippm-responsiv= eness/issues/36 and will be working on an updated I-D for the = coming weeks.


        Christoph

        On Feb = 15, 2022, at 4:33 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

        Hi Christoph,
        thank you for putting your = thought into my comments. Your understanding is absolutely correct and = the new section, as you've outlined it, would make the document even = more useful to a reader. With that plan in place, I support the adoption = of the draft and would help with review and comments.

        Regards,
        Greg

        On Tue, Feb 15, 2022 at 4:11 PM = Christoph Paasch <cpaasch@apple.com> wrote:
        Hello Greg,

        On Feb = 8, 2022, at 1:10 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

        Hi = Christoph,
        apologies for the belated response and thank = you for sharing interesting details of you using the measurement method. = I think that if the measurement method can not only provide the = Round-trip Per Minute (RPM) metric but expose the network = propagation and residential components of the round-trip delay, then it = seems to me, the scope of the draft to be aligned with the charter of = the IPPM WG and I'll be in favor of the WG adoption of the = work.
        What do you think? What is the opinion = of the authors and the WG?

        I am assuming that with = "residential components" you mean the server/client-side contribution to = the measured latency, right?

        In that case, yes the method does allow = to separate these, as latency-probes are sent on both the = load-generating connections and on separate connections. The difference = between the two represents the "server-side contribution" to the = latency.

        I = think what would be helpful would be a section in the draft that = explains the different sources of latency (network, server, client) and = how they affect the final RPM-number and how one can separate out these = two components. It is also important to understand that the results are = highly implementation-dependent. And explaining that in this section = should help, I believe.

        Would that be in line with what you are looking = for?


        Thanks,
        Christoph



        Regards,
        Greg

        On Thu, Jan 6, 2022 at 4:42 PM = Christoph Paasch <cpaasch@apple.com> wrote:
        Hello Greg,

        On Jan 6, 2022, at 3:00 PM, Greg Mirsky = <gregimirsky@gmail.com> wrote:

        Hi Christoph,
        a happy and healthy = New Year to you and All!

        Happy New Year to you as = well!

        Thank you for your kind = consideration of my notes and detailed responses. Please find my = follow-up notes in-line below under the GIM>> = tag.

        Thanks for your replies. Please see = inline:

        On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch = <cpaasch@apple.com> wrote:
        Hello Greg,

        thanks for your = comments. Please see inline:

        On Dec = 22, 2021, at 11:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

        Dear Marcus, Authors, = et al,
        apologies for the belated response.
        I've read the draft and have some comments to share with = you:
        • as I understand = it, the proposed new responsiveness metric is viewed as the single = indicator of a bufferbloat condition in a network. As I recall, the = discussion at Measuring Network Quality for End-Users workshop and on the mailing list indicated, that = there=E2=80=99s no consensus on what behaviors, symptoms can reliably = signal the bufferbloat. =
        We are not trying for this responsiveness metric to be "the = single indicator of bufferbloat". Bufferbloat can be measured in many = different number of ways. And each of these will produce a correct, but = a different result. Thus, "bufferbloat" is whatever the methodology = tries to detect.

        Let me give an example of two methodologies that are both = correct but both will produce entirely different numbers :

        If we would decide to = generate the load by flooding the network with UDP traffic from a = specific 4-tuple and measure latency with parallel ICMP pings. Then, on = a over-buffered FIFO queue we would measure huge latencies (thus = correctly expose bufferbloat), while on a FQ-codel queue we would not = measure any bufferbloat.

        If on the other hand, the load-generating traffic is changing = the source-port for every single UDP-packet, then in both the FIFO-queue = and the FQ-codel queue we will measure huge amounts of = bufferbloat.

        Thus, these two methods both produced correct results but = with hugely different numbers in the FQ-codel case. [1]

        Now, while both methods = measure some variant of bufferbloat, they both don't measure a realistic = usage of the network.
        GIM>> Thank you for the insights. It seems to me that = what the method can demonstrate is rather the level of efficiency of the = AQM in the network for a particular class of = applications.

        Yes, that is a good = description. It is for a "particular class of applications" and we are = trying to make this class of applications representative of a "typical = user-scenario". (admittedly, we can debate forever on what kind of = applications are representative and I would love to have that debate = :-)).

        On the = point of "efficiency of the AQM". I would go even further that it's not = only AQM but also the client- and server-side implementations of these = applications (as noted further below).




        That is why the "Responsiveness under = working conditions" tries to clearly specify how the load is generated = and how the latency is being measured. And it does not measure = "bufferbloat" but it measures "responsiveness under working conditions" = based on the methodology that is being used (using HTTP/2 or HTTP/3, = multiple flows, ...). It does expose bufferbloat which can happen in the = network. It also exposes certain server-side behaviors that can cause = (huge amounts of) additional latency - those behaviors are typically not = called "bufferbloat".
        GIM>> Thank you for pointing out that the result of the = RTT measurement has two contributing factors - network and = server.

        Yes, servers contribute as do the = client-side implementations. It's all three (client, network, server) = that need to work "correctly" to achieve good responsiveness. Btw., as = we are now gathering more experience with our methodology in different = environments we find that the biggest portions of latency actually come = from the server-side. We see several seconds of latency introduced by = the HTTP/2 and TCP implementations.

        It = seems worth enhancing the method to localize each contribution and = measure them separately.

        With the latency = measuring probes being sent on load-bearing connections and separate = connections and with the separate connections serving to measure = DNS/TCP/... individually, the different data-points actually allow to = localize to some extend.

        However, I would be reluctant to dive too deep into = localization/trouble-shooting/debugging of networks as part of this I-D. = As this opens a whole new can of worms. We could then start thinking = about sending latency-probes while playing with the IP TTL to find which = router is introducing the latency,... It's an entirely different = research-topic IMO :-) Dave Taht was thinking of starting something = along these lines (https://github.com/dtaht/wtbb).

          • It seems that = it would be reasonable to first define what is being measured, = characterized by the responsiveness metric. Having a document that = discusses and defines the bufferbloat would be = great.
          I agree that there is a lack of definition for what = "bufferbloat" really is.

          The way we look at "responsiveness under working conditions" = is that it measures the latency in conditions that may realistically = happen in worst-case scenarios with end-users/implementations that are = non-malicious (non-malicious to exclude the UDP-flooding = scenario).

          Thus,= I assume we should make a better job at explaining this. The lack of a = formal definition of "bufferbloat" doesn't help and thus we are indeed = using this term a bit freely in the current draft. We will improve the = Introduction to better set the stage (https://github.com/network-quality/draft-cpaasch-ippm-responsiv= eness/issues/31).

          • It seems like in the foundation of the methodology described = in the draft lies the assumption that without adding new flows the = available bandwidth is constant, does not change. While that = is mostly the case, there are technologies that behave differently and = may change bandwidth because of the outside conditions. Some of these = behaviors of links with variable discrete bandwidth are discussed = in, for example, RFC 8330 and RFC = 8625.
          I'm not sure I entirely understand your comment. But let me = explain why we are gradually adding new flows:

          1. TCP-implementations have usually a = fixed limit for the upper bound of the receive window. In some networks = that upper bound is lower than the BDP of the network. Thus, the only = way to reach full capacity is by having multiple flows.
          2. Having multiple connections allows to quicker achieve full = capacity in high-RTT networks and thus speeds up the = test-duration.
          3. In some networks with "random" = packet-loss, congestion-control may come in the way of achieving full = capacity. Again, multiple flows will work around = that.
          GIM>> I = might have asked several questions at once. Let me clarify what I am = looking for:
          • As I = understand the method of creating the "working conditions in a network" = is based on certain assumptions. First, seems is that the bandwidth is = symmetrical between the measurement points. Second, that the bandwidth = doesn't change for the duration of the measurement session. AFAIK, in = the access networks, both are not necessarily always the = case.
          We don't have the assumption that bandwidth is symmetrical = (assuming, you mean uplink/downlink symmetry - please clarify = otherwise).

          The = load-generating algorithm runs independently for uplink and downlink = traffic. And it is perfectly fine when both have huge = asymmetry.


          Regarding the stability of the = bandwidth:
          You are making a good point indeed that = we assume that the bandwidth is to some extend stable while ramping up = the flows to "working conditions". Admittedly that assumption does not = always hold, and that is one of the reasons why we try hard for the test = to not take too long.
          I'm not sure how we could = adjust the algorithm for varying bandwidth without introducing too much = complexity. I'm open for suggestions :-)
          • On the other hand, I might have missed how the method of = creating the "working conditions" guarantees a symmetrical load between = the measurement = points.
          As mentioned above, we don't assume a symmetrical load. Can = you show us where in the draft we give that impression, so we can fix = that?


          • Then, = I find the motivation not to use time units to express the = responsiveness metric not convincing:
             "Latency" is a poor measure of = responsiveness, since it can be hard
             for the general public to = understand.  The units are unfamiliar
             ("what is a = millisecond?") and counterintuitive ("100 msec - = that
             sounds good - it's only a tenth of a = second!").

          Can you expand on what = exactly is not convincing to you? Do you think that people will = mis-understand the metric or that milli-seconds is the right way to = communicate responsiveness to the general = public?
          GIM>> Let me = try. We know packet delay requirements for AR, VR applications. I = believe that gamers are familiar with these numbers too. The same is = likely the case for the industrial automation use cases served, for = example, by Deterministic = Networking.

          I can understand that for a technical = audience, milli-seconds is easy and familiar. A non-technical audience = might be more open to accepting a new "higher-is-better" metric. = Responsiveness is something new and abstract so, it's kind of natural = that it comes with a new unit.

          But I fully recognize that that's a = controversial topic and can be discussed at length :)


          Cheers,
          Christoph



          Thanks a lot,
          Christoph

          [1] And there are many = networks that prioritize ICMP pings, thus we could observe even more = different results based on what protocol is used to measure the = latency.


          On Mon, Dec = 6, 2021 at 7:53 AM Marcus Ihlar <marcus.ihlar=3D40ericsson.com@dmarc.ietf.org> = wrote:

          Hi IPPM,

           

          This email = starts an adoption call for draft-cpaasch-ippm-responsiveness, = "Responsiveness under Working Conditions=E2=80=9D. This document = specifies the =E2=80=9CRPM Test=E2=80=9D for measuring user experience = when the network is fully loaded. The intended status of the document is = Experimental.   

           

          https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiven= ess/

          https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-respon= siveness-01

           

          This adoption call will last until Monday, December 20. Please review the document, and = reply to this email thread to indicate if you think IPPM should adopt = this document.

           

          BR,

          Marcus

           

          _______________________________________________
          ippm mailing list
          ippm@ietf.org
          https://www.ietf.org/mailman/listinfo/ippm
          _______________________________________________
          ippm = mailing list
          ippm@ietf.org
          https://www.ietf.org/mailman/listinfo/ippm




          = --Apple-Mail=_183051AE-3B0D-46D6-AB3D-DEA4F026BFED-- From nobody Tue Feb 15 17:00:48 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 13F063A1219 for ; Tue, 15 Feb 2022 17:00:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.099 X-Spam-Level: X-Spam-Status: No, score=-7.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 ssWFFRZKGTAa for ; Tue, 15 Feb 2022 17:00:41 -0800 (PST) Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D18013A1214 for ; Tue, 15 Feb 2022 17:00:40 -0800 (PST) Received: by mail-ej1-x62f.google.com with SMTP id p9so948812ejd.6 for ; Tue, 15 Feb 2022 17:00:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=eSvJYkWt+T78dH6kyFXxMswECQ4OIo/+vV1C7b3yoEs=; b=BjEKaZwNHzQyMHR6UJsSrt1nIo/xhEvhSK8XlSqSR0EnMnoLQQbNBiBaHespOFqNii 5EkvdD+vrgvdTVesEay6u2t6kAVR0dpDl6SOt9QCP3Ycp0kaExIFAg092E0J8PIc45XL 5Z7rtS7JYRmpFLNZv+yEyni8EFjR+jd6gH/oE+L/TvIWm1Js0X0V8MA7bH2Rd/Ccy9Im Y2BaZK4BAdCNg94aDB26qOpkyW6SZ/RsWGNSiTQ6W/PUsq8ecJCLhFm4oe98BEMmrSY+ HIU1GD4W2PVphPRooW79TdSb+Gs1fmRYRWQInY/uYyf5gp6bZ4EdDznu0cW5rzn6sHXa Nzsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=eSvJYkWt+T78dH6kyFXxMswECQ4OIo/+vV1C7b3yoEs=; b=7EfeL+bTmeZZwjDxpo3zruelaNHD1hfJcSOPdehGYnLUyNLxcQlTW+zH8TukYmS+nL FZErxn8MTrL8hfJ3I111xb5tq1Ljfr6JeKBZiXvkcvKWpRR8BqebHt3lKa0bR5+83PFc dnGzmjSe9N5TKuzSlTt4ZYjxYqyeBBbwRWxZ3Cmipcu7XtIeZaaw0uf5jBbkRjCtZTbR u2rtVbRpg9fCLnOdYHct85rtEM3+KaosGDCfkiXr/y1jDns1uBi2Jw7hlvccRYXO8LHF rRDAduwcBoeG0LEgRXVlwvsRUl3PKssuxr/24rSHZnhoc2K100gtzMZB563nyYum4h56 FuSw== X-Gm-Message-State: AOAM532Fmevyq0/fpF3o9C2GCNwTzwIFsAGeurTlZLYrhwFO8F/XCTkP e/F7Hz7uTp58BQW7lb9O5NggycyngFp0lF3CGUg= X-Google-Smtp-Source: ABdhPJwk2ATcaK1PnsuVYhkbU44D2tiI0ODtitHwFl8kQAkicDe+V7IBGRkcfXvsEo19cUOzCLZ4MHHN7kDZrhnsON8= X-Received: by 2002:a17:907:205a:b0:6ce:e4c5:4809 with SMTP id pg26-20020a170907205a00b006cee4c54809mr519604ejb.116.1644973238042; Tue, 15 Feb 2022 17:00:38 -0800 (PST) MIME-Version: 1.0 References: <3DC3F6B6-229E-46C6-BD84-2A6A7FE6DD48@apple.com> <9340CFDA-079C-4490-A01C-EB863D365F8F@apple.com> In-Reply-To: From: Dave Taht Date: Tue, 15 Feb 2022 17:00:26 -0800 Message-ID: To: Christoph Paasch Cc: Greg Mirsky , Marcus Ihlar , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Feb 2022 01:00:46 -0000 On Tue, Feb 15, 2022 at 4:11 PM Christoph Paasch wrote: > > Hello Greg, > > On Feb 8, 2022, at 1:10 PM, Greg Mirsky wrote: > > Hi Christoph, > apologies for the belated response and thank you for sharing interesting = details of you using the measurement method. I think that if the measuremen= t method can not only provide the Round-trip Per Minute (RPM) metric but ex= pose the network propagation and residential components of the round-trip d= elay, then it seems to me, the scope of the draft to be aligned with the ch= arter of the IPPM WG and I'll be in favor of the WG adoption of the work. > What do you think? What is the opinion of the authors and the WG? > > > I am assuming that with "residential components" you mean the server/clie= nt-side contribution to the measured latency, right? > > In that case, yes the method does allow to separate these, as latency-pro= bes are sent on both the load-generating connections and on separate connec= tions. The difference between the two represents the "server-side contribut= ion" to the latency. I remember vividly how "neat" it seemed that QUIC had adopted the idea of an inband "ping" in version Q018 in 2012 (or so). https://docs.google.com/document/d/1WJvyZflAO2pq77yOLbp9NsGjC1CHetAXV8I0fQe= -B_U/edit Q018: Added a PING frame What I don't remember or understand at the moment is I'm under the impression that's in the SSL layer as of http2.0? There a good ref? > > I think what would be helpful would be a section in the draft that explai= ns the different sources of latency (network, server, client) and how they = affect the final RPM-number and how one can separate out these two componen= ts. It is also important to understand that the results are highly implemen= tation-dependent. And explaining that in this section should help, I believ= e. > > Would that be in line with what you are looking for? > > > Thanks, > Christoph > > > > Regards, > Greg > > On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch wrote= : >> >> Hello Greg, >> >> On Jan 6, 2022, at 3:00 PM, Greg Mirsky wrote: >> >> Hi Christoph, >> a happy and healthy New Year to you and All! >> >> >> Happy New Year to you as well! >> >> Thank you for your kind consideration of my notes and detailed responses= . Please find my follow-up notes in-line below under the GIM>> tag. >> >> >> Thanks for your replies. Please see inline: >> >> On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch wro= te: >>> >>> Hello Greg, >>> >>> thanks for your comments. Please see inline: >>> >>> On Dec 22, 2021, at 11:43 PM, Greg Mirsky wrote= : >>> >>> Dear Marcus, Authors, et al, >>> apologies for the belated response. >>> I've read the draft and have some comments to share with you: >>> >>> as I understand it, the proposed new responsiveness metric is viewed as= the single indicator of a bufferbloat condition in a network. As I recall,= the discussion at Measuring Network Quality for End-Users workshop and on = the mailing list indicated, that there=E2=80=99s no consensus on what behav= iors, symptoms can reliably signal the bufferbloat. >>> >>> We are not trying for this responsiveness metric to be "the single indi= cator of bufferbloat". Bufferbloat can be measured in many different number= of ways. And each of these will produce a correct, but a different result.= Thus, "bufferbloat" is whatever the methodology tries to detect. >>> >>> Let me give an example of two methodologies that are both correct but b= oth will produce entirely different numbers : >>> >>> If we would decide to generate the load by flooding the network with UD= P traffic from a specific 4-tuple and measure latency with parallel ICMP pi= ngs. Then, on a over-buffered FIFO queue we would measure huge latencies (t= hus correctly expose bufferbloat), while on a FQ-codel queue we would not m= easure any bufferbloat. >>> >>> If on the other hand, the load-generating traffic is changing the sourc= e-port for every single UDP-packet, then in both the FIFO-queue and the FQ-= codel queue we will measure huge amounts of bufferbloat. >>> >>> Thus, these two methods both produced correct results but with hugely d= ifferent numbers in the FQ-codel case. [1] >>> >>> Now, while both methods measure some variant of bufferbloat, they both = don't measure a realistic usage of the network. >> >> GIM>> Thank you for the insights. It seems to me that what the method ca= n demonstrate is rather the level of efficiency of the AQM in the network f= or a particular class of applications. >> >> >> Yes, that is a good description. It is for a "particular class of applic= ations" and we are trying to make this class of applications representative= of a "typical user-scenario". (admittedly, we can debate forever on what k= ind of applications are representative and I would love to have that debate= :-)). >> >> On the point of "efficiency of the AQM". I would go even further that it= 's not only AQM but also the client- and server-side implementations of the= se applications (as noted further below). >> >> >>> >>> >>> That is why the "Responsiveness under working conditions" tries to clea= rly specify how the load is generated and how the latency is being measured= . And it does not measure "bufferbloat" but it measures "responsiveness und= er working conditions" based on the methodology that is being used (using H= TTP/2 or HTTP/3, multiple flows, ...). It does expose bufferbloat which can= happen in the network. It also exposes certain server-side behaviors that = can cause (huge amounts of) additional latency - those behaviors are typica= lly not called "bufferbloat". >> >> GIM>> Thank you for pointing out that the result of the RTT measurement = has two contributing factors - network and server. >> >> >> Yes, servers contribute as do the client-side implementations. It's all = three (client, network, server) that need to work "correctly" to achieve go= od responsiveness. Btw., as we are now gathering more experience with our m= ethodology in different environments we find that the biggest portions of l= atency actually come from the server-side. We see several seconds of latenc= y introduced by the HTTP/2 and TCP implementations. >> >> It seems worth enhancing the method to localize each contribution and me= asure them separately. >> >> >> With the latency measuring probes being sent on load-bearing connections= and separate connections and with the separate connections serving to meas= ure DNS/TCP/... individually, the different data-points actually allow to l= ocalize to some extend. >> >> However, I would be reluctant to dive too deep into localization/trouble= -shooting/debugging of networks as part of this I-D. As this opens a whole = new can of worms. We could then start thinking about sending latency-probes= while playing with the IP TTL to find which router is introducing the late= ncy,... It's an entirely different research-topic IMO :-) Dave Taht was thi= nking of starting something along these lines (https://github.com/dtaht/wtb= b). >> >>> It seems that it would be reasonable to first define what is being meas= ured, characterized by the responsiveness metric. Having a document that di= scusses and defines the bufferbloat would be great. >>> >>> I agree that there is a lack of definition for what "bufferbloat" reall= y is. >>> >>> The way we look at "responsiveness under working conditions" is that it= measures the latency in conditions that may realistically happen in worst-= case scenarios with end-users/implementations that are non-malicious (non-m= alicious to exclude the UDP-flooding scenario). >>> >>> Thus, I assume we should make a better job at explaining this. The lack= of a formal definition of "bufferbloat" doesn't help and thus we are indee= d using this term a bit freely in the current draft. We will improve the In= troduction to better set the stage (https://github.com/network-quality/draf= t-cpaasch-ippm-responsiveness/issues/31). >>> >>> It seems like in the foundation of the methodology described in the dra= ft lies the assumption that without adding new flows the available bandwidt= h is constant, does not change. While that is mostly the case, there are te= chnologies that behave differently and may change bandwidth because of the = outside conditions. Some of these behaviors of links with variable discrete= bandwidth are discussed in, for example, RFC 8330 and RFC 8625. >>> >>> I'm not sure I entirely understand your comment. But let me explain why= we are gradually adding new flows: >>> >>> 1. TCP-implementations have usually a fixed limit for the upper bound o= f the receive window. In some networks that upper bound is lower than the B= DP of the network. Thus, the only way to reach full capacity is by having m= ultiple flows. >>> 2. Having multiple connections allows to quicker achieve full capacity = in high-RTT networks and thus speeds up the test-duration. >>> 3. In some networks with "random" packet-loss, congestion-control may c= ome in the way of achieving full capacity. Again, multiple flows will work = around that. >> >> GIM>> I might have asked several questions at once. Let me clarify what = I am looking for: >> >> As I understand the method of creating the "working conditions in a netw= ork" is based on certain assumptions. First, seems is that the bandwidth is= symmetrical between the measurement points. Second, that the bandwidth doe= sn't change for the duration of the measurement session. AFAIK, in the acce= ss networks, both are not necessarily always the case. >> >> We don't have the assumption that bandwidth is symmetrical (assuming, yo= u mean uplink/downlink symmetry - please clarify otherwise). >> >> The load-generating algorithm runs independently for uplink and downlink= traffic. And it is perfectly fine when both have huge asymmetry. >> >> >> Regarding the stability of the bandwidth: >> You are making a good point indeed that we assume that the bandwidth is = to some extend stable while ramping up the flows to "working conditions". A= dmittedly that assumption does not always hold, and that is one of the reas= ons why we try hard for the test to not take too long. >> I'm not sure how we could adjust the algorithm for varying bandwidth wit= hout introducing too much complexity. I'm open for suggestions :-) >> >> On the other hand, I might have missed how the method of creating the "w= orking conditions" guarantees a symmetrical load between the measurement po= ints. >> >> As mentioned above, we don't assume a symmetrical load. Can you show us = where in the draft we give that impression, so we can fix that? >> >>> >>> Then, I find the motivation not to use time units to express the respon= siveness metric not convincing: >>> >>> "Latency" is a poor measure of responsiveness, since it can be hard >>> for the general public to understand. The units are unfamiliar >>> ("what is a millisecond?") and counterintuitive ("100 msec - that >>> sounds good - it's only a tenth of a second!"). >>> >>> >>> Can you expand on what exactly is not convincing to you? Do you think t= hat people will mis-understand the metric or that milli-seconds is the righ= t way to communicate responsiveness to the general public? >> >> GIM>> Let me try. We know packet delay requirements for AR, VR applicati= ons. I believe that gamers are familiar with these numbers too. The same is= likely the case for the industrial automation use cases served, for exampl= e, by Deterministic Networking. >> >> >> I can understand that for a technical audience, milli-seconds is easy an= d familiar. A non-technical audience might be more open to accepting a new = "higher-is-better" metric. Responsiveness is something new and abstract so,= it's kind of natural that it comes with a new unit. >> >> But I fully recognize that that's a controversial topic and can be discu= ssed at length :) >> >> >> Cheers, >> Christoph >> >>> >>> >>> Thanks a lot, >>> Christoph >>> >>> [1] And there are many networks that prioritize ICMP pings, thus we cou= ld observe even more different results based on what protocol is used to me= asure the latency. >>> >>> >>> On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar wrote: >>>> >>>> Hi IPPM, >>>> >>>> >>>> >>>> This email starts an adoption call for draft-cpaasch-ippm-responsivene= ss, "Responsiveness under Working Conditions=E2=80=9D. This document specif= ies the =E2=80=9CRPM Test=E2=80=9D for measuring user experience when the n= etwork is fully loaded. The intended status of the document is Experimental= . >>>> >>>> >>>> >>>> https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/ >>>> >>>> https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-responsivenes= s-01 >>>> >>>> >>>> >>>> This adoption call will last until Monday, December 20. Please review = the document, and reply to this email thread to indicate if you think IPPM = should adopt this document. >>>> >>>> >>>> >>>> BR, >>>> >>>> Marcus >>>> >>>> >>>> >>>> _______________________________________________ >>>> ippm mailing list >>>> ippm@ietf.org >>>> https://www.ietf.org/mailman/listinfo/ippm >>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >>> >>> >> > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm -- I tried to build a better future, a few times: https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org Dave T=C3=A4ht CEO, TekLibre, LLC From nobody Wed Feb 16 05:03:16 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A128F3A12D8; Wed, 16 Feb 2022 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Reflected Archived-At: Subject: Re: [ippm] AD Review #2 of RFC8321bis X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Feb 2022 13:03:14 -0000 --_000_8cc60c2a6ce14ff6900a919d3d433e5bhuaweicom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgTWFydGluLA0KVGhhbmsgeW91IGZvciB5b3VyIHJldmlldy4NCkkgd2lsbCBwdWJsaXNoIHRo ZSByZXZpc2lvbiAtMDIgc29vbiBhbmQgdGhlbiBJIHdpbGwgcHJlcGFyZSByZXZpc2lvbiAtMDMu DQoNClBsZWFzZSBmaW5kIG15IGFuc3dlcnMgaW5saW5lIHRhZ2dlZCBhcyBbR0ZdDQoNClJlZ2Fy ZHMsDQoNCkdpdXNlcHBlDQoNCg0KRnJvbTogTWFydGluIER1a2UgPG1hcnRpbi5oLmR1a2VAZ21h aWwuY29tPg0KU2VudDogVHVlc2RheSwgRmVicnVhcnkgMTUsIDIwMjIgMTE6MDEgUE0NClRvOiBk cmFmdC1maW9jY29sYS1yZmM4MzIxYmlzLmFsbEBpZXRmLm9yZw0KQ2M6IElFVEYgSVBQTSBXRyA8 aXBwbUBpZXRmLm9yZz4NClN1YmplY3Q6IEFEIFJldmlldyAjMiBvZiBSRkM4MzIxYmlzDQoNCkhp 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tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=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 pueRJgK8sbcH; Wed, 16 Feb 2022 05:35:50 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B23713A1318; Wed, 16 Feb 2022 05:35:49 -0800 (PST) Received: from fraeml709-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4JzJkt4rVfz67yS4; Wed, 16 Feb 2022 21:31:18 +0800 (CST) Received: from fraeml714-chm.china.huawei.com (10.206.15.33) by fraeml709-chm.china.huawei.com (10.206.15.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Wed, 16 Feb 2022 14:35:46 +0100 Received: from fraeml714-chm.china.huawei.com ([10.206.15.33]) by fraeml714-chm.china.huawei.com ([10.206.15.33]) with mapi id 15.01.2308.021; Wed, 16 Feb 2022 14:35:46 +0100 From: Giuseppe Fioccola To: Martin Duke , "draft-fioccola-rfc8889bis.all@ietf.org" , IETF IPPM WG Thread-Topic: AD Review #2 of RFC8889bis Thread-Index: AQHYIsmUap9e33VqMU+d1M8OK2dk6qyWFjgg Date: Wed, 16 Feb 2022 13:35:46 +0000 Message-ID: <2af9dadf3bdb450083ffa6d30d106a94@huawei.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.48.220.44] Content-Type: multipart/alternative; boundary="_000_2af9dadf3bdb450083ffa6d30d106a94huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [ippm] AD Review #2 of RFC8889bis X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Feb 2022 13:36:03 -0000 --_000_2af9dadf3bdb450083ffa6d30d106a94huaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Martin, Thanks for your review. I can update RFC8889bis as well in the next few days. Please find my answers inline tagged as [GF] Regards, Giuseppe From: Martin Duke Sent: Wednesday, February 16, 2022 1:10 AM To: draft-fioccola-rfc8889bis.all@ietf.org; IETF IPPM WG Subject: AD Review #2 of RFC8889bis Giuseppe, Only two new issues with this one: 1) The formula for L in section 7 is not exactly wrong, but it is very oddl= y expressed. (a) In 8321 you introduce the value A, which is the maximum clock skew betw= een the two nodes. Together with the path delay, this provides the lower bo= und for L. In 8889, you introduce m as the maximum divergence between marking nodes, b= ut the text says this is not clock skew but a result of the nodes being "ov= erloaded". I don't know if overloading is a concern or not, but if it is, c= learly it is an issue in the point-to-point case as well! It would be better if all skew issues -- both clock and overloading -- were= brought into a single quantity A. I don't see any reason that marking node= s would have different properties than counting nodes[1], so why not use th= e same value? IIUC, 8321 and 8889 should have the same constraints on L -- the worst-case= for clock skew is the same for both. [GF]: Yes, we can keep it simple and use the same constraints on L. I agree= that the additional mismatch between the marking nodes can simply be incor= porated into A. I will revise the text accordingly. (b) A question I don't know the answer to: is 3 standard deviations really = enough in the multipoint case? If there are thousands of possible paths and= a few of them are quite a bit longer, won't that introduce many errors? Th= is isn't a single entity you're sampling, but a heterogenous set of paths. = Is there a reason to think this is a normal distribution? [GF]: We can assume that the multiple paths behaviors can still be represen= ted by distinct normal distributions. In this case, the combination of norm= al distributions can result in a new normal distribution. So, we can say th= at the range of 3 standard deviations is still valid under this assumption. (2) The delay measurement section is vague about one-way vs. two-way delay.= Is two-way delay meaningful in a multipath environment? [GF]: Yes I can add more considerations in section 8. In case of delay meas= urements on the basis of multipoint paths, the one-way delay value is repre= sentative of an entire multipoint path and you can calculate the two-way de= lay by summing the one-way delays of the two directions, as we do for RFC83= 21. While, in case of delay measurements on a single-packet basis (e.g. dou= ble marking or hashing), it is always possible but it is not immediate sinc= e you have to couple the measurement on each single path with the opposite = direction. In this case the NMS can do the calculation. **** These seem like the sort of questions that would be answered by implementat= ion and deployment experience. How do we set L? What times of delay measure= ment are viable? If 8889 doesn't have enough deployment to answer these que= stions, maybe it's not ready for PS? [GF]: RFC8889 has enough implementation and deployment experience as RFC832= 1. So it is ready for PS since it is the natural extension of RFC8321 for m= ultipoint scenarios. If you find it useful, I can add a section about the "= Results of the Multipoint Alternate Marking Experiment", similarly to RFC83= 21. Martin [1] In the multipoint case, the distinction between marking nodes and egres= s nodes seems artificial -- the diagrams seem to envision traffic going fro= m left to right, but of course it should be traveling in all directions! [GF]: To simplify the explanation, we considered one way but, of course, it= is always two way. I can highlight this point in the next version. --_000_2af9dadf3bdb450083ffa6d30d106a94huaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

          Hi Martin,

          Thanks for your review.

          I can update RFC8889bis as well in the next few days= .

           

          Please find my answers inline tagged as [GF]

           

          Regards,

           

          Giuseppe

           

           

          From: Martin Duke <martin.h.duke@gmail.com= >
          Sent: Wednesday, February 16, 2022 1:10 AM
          To: draft-fioccola-rfc8889bis.all@ietf.org; IETF IPPM WG <ippm@ie= tf.org>
          Subject: AD Review #2 of RFC8889bis

           

          Giuseppe,

           

          Only two new issues with this one:

           

          1) The formula for L in section 7 is not exactly wro= ng, but it is very oddly expressed.

           

          (a) In 8321 you introduce the value A, which is the = maximum clock skew between the two nodes. Together with the path delay, thi= s provides the lower bound for L.

           

          In 8889, you introduce m as the maximum diverge= nce between marking nodes, but the text says this is not clock skew but a r= esult of the nodes being "overloaded". I don't know if overloadin= g is a concern or not, but if it is, clearly it is an issue in the point-to-point case as well!

           

          It would be better if all skew issues -- both clock = and overloading -- were brought into a single quantity A. I don't see any r= eason that marking nodes would have different properties than counting node= s[1], so why not use the same value?

           

          IIUC, 8321 and 8889 should have the same constraints= on L -- the worst-case for clock skew is the same for both.

           

          [GF]: Yes, we can keep it simple and use the same co= nstraints on L. I agree that the additional mismatch between the marking no= des can simply be incorporated into A. I will revise the text accordingly.<= o:p>

           

          (b) A question I don't know the answer to: is 3 stan= dard deviations really enough in the multipoint case? If there are thousand= s of possible paths and a few of them are quite a bit longer, won't that in= troduce many errors? This isn't a single entity you're sampling, but a heterogenous set of paths. Is there a= reason to think this is a normal distribution?

           

          [GF]: We can assume that the multiple paths behavior= s can still be represented by distinct normal distributions. In this case, = the combination of normal distributions can result in a new normal distribu= tion. So, we can say that the range of 3 standard deviations is still valid under this assumption.<= /p>

           

          (2) The delay measurement section is vague about one= -way vs. two-way delay. Is two-way delay meaningful in a multipath environm= ent?

           

          [GF]: Yes I can add more considerations in section 8= . In case of delay measurements on the basis of multipoint paths, the one-w= ay delay value is representative of an entire multipoint path and you can c= alculate the two-way delay by summing the one-way delays of the two directions, as we do for RFC8321. While, in = case of delay measurements on a single-packet basis (e.g. double marking or= hashing), it is always possible but it is not immediate since you have to = couple the measurement on each single path with the opposite direction. In this case the NMS can do the calculat= ion.

           

          ****

           

          These seem like the sort of questions that would be = answered by implementation and deployment experience. How do we set L? What= times of delay measurement are viable? If 8889 doesn't have enough deploym= ent to answer these questions, maybe it's not ready for PS?

           

          [GF]: RFC8889 has enough implementation and deployme= nt experience as RFC8321. So it is ready for PS since it is the natural ext= ension of RFC8321 for multipoint scenarios. If you find it useful, I can ad= d a section about the “Results of the Multipoint Alternate Marking Experiment”, similarly to RFC8321.<= o:p>

           

          Martin

           

          [1] In the multipoint case, the distinction bet= ween marking nodes and egress nodes seems artificial -- the diagrams seem t= o envision traffic going from left to right, but of course it should be tra= veling in all directions!

           

          [GF]: To simplify the explanation, we considered one= way but, of course, it is always two way. I can highlight this point in th= e next version.

           

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dnA4b2g2NDNXMTBwNjlrSE0xbXpzdlBURld6TkhpJA0K From nobody Thu Feb 17 05:24:26 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 147B53A02F9; Thu, 17 Feb 2022 05:24:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=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 enaXeNnMm8dY; Thu, 17 Feb 2022 05:24:22 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9D2EA3A012C; Thu, 17 Feb 2022 05:24:22 -0800 (PST) Received: from fraeml707-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4JzwWr14JYz67mdF; Thu, 17 Feb 2022 21:23:52 +0800 (CST) Received: from fraeml714-chm.china.huawei.com (10.206.15.33) by fraeml707-chm.china.huawei.com (10.206.15.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Thu, 17 Feb 2022 14:24:20 +0100 Received: from fraeml714-chm.china.huawei.com ([10.206.15.33]) by fraeml714-chm.china.huawei.com ([10.206.15.33]) with mapi id 15.01.2308.021; Thu, 17 Feb 2022 14:24:20 +0100 From: Giuseppe Fioccola To: Martin Duke , IETF IPPM WG CC: "draft-fioccola-rfc8321bis.all@ietf.org" , "draft-fioccola-rfc8889bis.all@ietf.org" Thread-Topic: RFC8321bis and RFC8889bis: draft-02 Thread-Index: AdgkATgXIMY0zCqzTny6KOgRPKluEw== Date: Thu, 17 Feb 2022 13:24:20 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.48.223.67] Content-Type: multipart/alternative; boundary="_000_fc96f6e4ec6347dfa72c2e6ccdf87313huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [ippm] RFC8321bis and RFC8889bis: draft-02 X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Feb 2022 13:24:25 -0000 --_000_fc96f6e4ec6347dfa72c2e6ccdf87313huaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Martin, All, Please note that I just submitted new revisions of both RFC8321bis and RFC8= 889bis. I tried to address the latest comments. I plan to submit revision -03 of RFC8321bis early next week for the IETF La= st Call. https://datatracker.ietf.org/doc/draft-fioccola-rfc8321bis/ https://datatracker.ietf.org/doc/draft-fioccola-rfc8889bis/ Reviews and suggestions will be welcome. Regards, Giuseppe --_000_fc96f6e4ec6347dfa72c2e6ccdf87313huaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

          Hi Martin, All,

          Please note that I just submitted new revisions of b= oth RFC8321bis and RFC8889bis.

          I tried to address the latest comments.

           

          I plan to submit revision -03 of RFC8321bis early ne= xt week for the IETF Last Call.

           

          https://datatracker.ietf.org/doc/draft-fioccola-rfc8321= bis/

          https://datatracker.ietf.org/doc/draft-fioccola-rfc8889= bis/

           

          Reviews and suggestions will be welcome.<= /p>

           

          Regards,

           

          Giuseppe

           

          --_000_fc96f6e4ec6347dfa72c2e6ccdf87313huaweicom_-- From nobody Thu Feb 17 16:24:14 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 31C403A053F for ; Thu, 17 Feb 2022 16:24:11 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.672 X-Spam-Level: X-Spam-Status: No, score=-2.672 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.576, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=apple.com 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 B4nk_QaNxtsF for ; 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Thu, 17 Feb 2022 16:23:58 -0800 (PST) From: Christoph Paasch Message-id: <74A71CF0-16BA-4403-B2DD-D2DAA264E2CA@apple.com> Content-type: multipart/alternative; boundary="Apple-Mail=_7F0F1375-6931-4C55-A2AD-4E0E54064D68" MIME-version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\)) Date: Thu, 17 Feb 2022 16:23:58 -0800 In-reply-to: Cc: Dave Taht , Marcus Ihlar , IETF IPPM WG To: "MORTON JR., AL" References: <3DC3F6B6-229E-46C6-BD84-2A6A7FE6DD48@apple.com> <9340CFDA-079C-4490-A01C-EB863D365F8F@apple.com> X-Mailer: Apple Mail (2.3693.60.0.1.1) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.425, 18.0.816 definitions=2022-02-17_09:2022-02-17, 2022-02-17 signatures=0 Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Feb 2022 00:24:12 -0000 --Apple-Mail=_7F0F1375-6931-4C55-A2AD-4E0E54064D68 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hello Al, > On Feb 16, 2022, at 8:07 AM, MORTON JR., AL wrote: >=20 > Hi Christoph, >=20 > you wrote: >> I think what would be helpful would be a section in the draft that = explains the different sources of latency (network, server, client) and = how they affect the final RPM-number and how one can separate out these = two components. It is also important to understand that the results are = highly implementation-dependent. And explaining that in this section = should help, I believe. >>=20 >=20 > when you say, "...the results are highly implementation-dependent.",=20= > which implementations are you referring to: >=20 > Network path? Server? Client? "Working Load" conditions?=20 Network path, Server and Client. Because the layer at which things are = being measured is right above the HTTP layer. Thus, = implementation-details all the way from the PHY up to HTTP matter and = can influence the results. >=20 > All of the above? >=20 > Network implementation should influence the results, the others not so = much (with a standardized metric, we should have equivalent results = across implementations, at least that's what we said in RFC6576/BCP176). = And it can be rather difficult to separate the (I count at least 4) = results-influencing factors. I think it is impossible to only have network implementation influence = the results. For example, if UDP is used to measure latency the entire = UDP-stack, IP-stack,... of the sender and receiver will influence the = results. In some way, sender and receive UDP/IP/Driver/... stack is part of the = "network implementation" here. For the responsiveness it is exactly the same. We use HTTP/2, and thus = this is part of the "network implementation". Does that make sense? Thanks, Christoph >=20 > more stuff to consider, > Al >=20 >=20 >> -----Original Message----- >> From: ippm > On = Behalf Of Dave Taht >> Sent: Tuesday, February 15, 2022 8:00 PM >> To: Christoph Paasch > >> Cc: Marcus Ihlar >; IETF IPPM WG >> > >> Subject: Re: [ippm] Adoption call for = draft-cpaasch-ippm-responsiveness >>=20 >> On Tue, Feb 15, 2022 at 4:11 PM Christoph Paasch >> wrote: >>>=20 >>> Hello Greg, >>>=20 >>> On Feb 8, 2022, at 1:10 PM, Greg Mirsky = wrote: >>>=20 >>> Hi Christoph, >>> apologies for the belated response and thank you for sharing = interesting >> details of you using the measurement method. I think that if the = measurement >> method can not only provide the Round-trip Per Minute (RPM) metric = but expose >> the network propagation and residential components of the round-trip = delay, >> then it seems to me, the scope of the draft to be aligned with the = charter of >> the IPPM WG and I'll be in favor of the WG adoption of the work. >>> What do you think? What is the opinion of the authors and the WG? >>>=20 >>>=20 >>> I am assuming that with "residential components" you mean the = server/client- >> side contribution to the measured latency, right? >>>=20 >>> In that case, yes the method does allow to separate these, as = latency-probes >> are sent on both the load-generating connections and on separate = connections. >> The difference between the two represents the "server-side = contribution" to >> the latency. >>=20 >> I remember vividly how "neat" it seemed that QUIC had adopted the = idea >> of an inband "ping" in version Q018 in 2012 (or so). >>=20 >> = https://urldefense.com/v3/__https://docs.google.com/document/d/1WJvyZflAO2= pq77 = >> yOLbp9NsGjC1CHetAXV8I0fQe-B_U/edit__;!!BhdT!yrleDfru-45Lar4Qe5- >> 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPeUiZuj5$ >> Q018: Added a PING frame >>=20 >> What I don't remember or understand at the moment is I'm under the >> impression that's in the SSL layer as of http2.0? There a good ref? >>=20 >>=20 >>=20 >>>=20 >>> I think what would be helpful would be a section in the draft that = explains >> the different sources of latency (network, server, client) and how = they affect >> the final RPM-number and how one can separate out these two = components. It is >> also important to understand that the results are highly = implementation- >> dependent. And explaining that in this section should help, I = believe. >>>=20 >>> Would that be in line with what you are looking for? >>>=20 >>>=20 >>> Thanks, >>> Christoph >>>=20 >>>=20 >>>=20 >>> Regards, >>> Greg >>>=20 >>> On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch > wrote: >>>>=20 >>>> Hello Greg, >>>>=20 >>>> On Jan 6, 2022, at 3:00 PM, Greg Mirsky > wrote: >>>>=20 >>>> Hi Christoph, >>>> a happy and healthy New Year to you and All! >>>>=20 >>>>=20 >>>> Happy New Year to you as well! >>>>=20 >>>> Thank you for your kind consideration of my notes and detailed = responses. >> Please find my follow-up notes in-line below under the GIM>> tag. >>>>=20 >>>>=20 >>>> Thanks for your replies. Please see inline: >>>>=20 >>>> On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch > wrote: >>>>>=20 >>>>> Hello Greg, >>>>>=20 >>>>> thanks for your comments. Please see inline: >>>>>=20 >>>>> On Dec 22, 2021, at 11:43 PM, Greg Mirsky > wrote: >>>>>=20 >>>>> Dear Marcus, Authors, et al, >>>>> apologies for the belated response. >>>>> I've read the draft and have some comments to share with you: >>>>>=20 >>>>> as I understand it, the proposed new responsiveness metric is = viewed as >> the single indicator of a bufferbloat condition in a network. As I = recall, the >> discussion at Measuring Network Quality for End-Users workshop and on = the >> mailing list indicated, that there=E2=80=99s no consensus on what = behaviors, symptoms >> can reliably signal the bufferbloat. >>>>>=20 >>>>> We are not trying for this responsiveness metric to be "the single >> indicator of bufferbloat". Bufferbloat can be measured in many = different >> number of ways. And each of these will produce a correct, but a = different >> result. Thus, "bufferbloat" is whatever the methodology tries to = detect. >>>>>=20 >>>>> Let me give an example of two methodologies that are both correct = but both >> will produce entirely different numbers : >>>>>=20 >>>>> If we would decide to generate the load by flooding the network = with UDP >> traffic from a specific 4-tuple and measure latency with parallel = ICMP pings. >> Then, on a over-buffered FIFO queue we would measure huge latencies = (thus >> correctly expose bufferbloat), while on a FQ-codel queue we would not = measure >> any bufferbloat. >>>>>=20 >>>>> If on the other hand, the load-generating traffic is changing the = source- >> port for every single UDP-packet, then in both the FIFO-queue and the = FQ-codel >> queue we will measure huge amounts of bufferbloat. >>>>>=20 >>>>> Thus, these two methods both produced correct results but with = hugely >> different numbers in the FQ-codel case. [1] >>>>>=20 >>>>> Now, while both methods measure some variant of bufferbloat, they = both >> don't measure a realistic usage of the network. >>>>=20 >>>> GIM>> Thank you for the insights. It seems to me that what the = method can >> demonstrate is rather the level of efficiency of the AQM in the = network for a >> particular class of applications. >>>>=20 >>>>=20 >>>> Yes, that is a good description. It is for a "particular class of >> applications" and we are trying to make this class of applications >> representative of a "typical user-scenario". (admittedly, we can = debate >> forever on what kind of applications are representative and I would = love to >> have that debate :-)). >>>>=20 >>>> On the point of "efficiency of the AQM". I would go even further = that it's >> not only AQM but also the client- and server-side implementations of = these >> applications (as noted further below). >>>>=20 >>>>=20 >>>>>=20 >>>>>=20 >>>>> That is why the "Responsiveness under working conditions" tries to = clearly >> specify how the load is generated and how the latency is being = measured. And >> it does not measure "bufferbloat" but it measures "responsiveness = under >> working conditions" based on the methodology that is being used = (using HTTP/2 >> or HTTP/3, multiple flows, ...). It does expose bufferbloat which can = happen >> in the network. It also exposes certain server-side behaviors that = can cause >> (huge amounts of) additional latency - those behaviors are typically = not >> called "bufferbloat". >>>>=20 >>>> GIM>> Thank you for pointing out that the result of the RTT = measurement has >> two contributing factors - network and server. >>>>=20 >>>>=20 >>>> Yes, servers contribute as do the client-side implementations. It's = all >> three (client, network, server) that need to work "correctly" to = achieve good >> responsiveness. Btw., as we are now gathering more experience with = our >> methodology in different environments we find that the biggest = portions of >> latency actually come from the server-side. We see several seconds of = latency >> introduced by the HTTP/2 and TCP implementations. >>>>=20 >>>> It seems worth enhancing the method to localize each contribution = and >> measure them separately. >>>>=20 >>>>=20 >>>> With the latency measuring probes being sent on load-bearing = connections >> and separate connections and with the separate connections serving to = measure >> DNS/TCP/... individually, the different data-points actually allow to = localize >> to some extend. >>>>=20 >>>> However, I would be reluctant to dive too deep into = localization/trouble- >> shooting/debugging of networks as part of this I-D. As this opens a = whole new >> can of worms. We could then start thinking about sending = latency-probes while >> playing with the IP TTL to find which router is introducing the = latency,... >> It's an entirely different research-topic IMO :-) Dave Taht was = thinking of >> starting something along these lines >> = (https://urldefense.com/v3/__https://github.com/dtaht/wtbb__;!!BhdT!yrleDf= ru- = >> 45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPRghwEjg$ ). >>>>=20 >>>>> It seems that it would be reasonable to first define what is being >> measured, characterized by the responsiveness metric. Having a = document that >> discusses and defines the bufferbloat would be great. >>>>>=20 >>>>> I agree that there is a lack of definition for what "bufferbloat" = really >> is. >>>>>=20 >>>>> The way we look at "responsiveness under working conditions" is = that it >> measures the latency in conditions that may realistically happen in = worst-case >> scenarios with end-users/implementations that are non-malicious = (non-malicious >> to exclude the UDP-flooding scenario). >>>>>=20 >>>>> Thus, I assume we should make a better job at explaining this. The = lack of >> a formal definition of "bufferbloat" doesn't help and thus we are = indeed using >> this term a bit freely in the current draft. We will improve the = Introduction >> to better set the stage >> = (https://urldefense.com/v3/__https://github.com/network-quality/draft-cpaa= sch- = >> ippm-responsiveness/issues/31__;!!BhdT!yrleDfru-45Lar4Qe5- >> 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU0pYBOv$ ). >>>>>=20 >>>>> It seems like in the foundation of the methodology described in = the draft >> lies the assumption that without adding new flows the available = bandwidth is >> constant, does not change. While that is mostly the case, there are >> technologies that behave differently and may change bandwidth because = of the >> outside conditions. Some of these behaviors of links with variable = discrete >> bandwidth are discussed in, for example, RFC 8330 and RFC 8625. >>>>>=20 >>>>> I'm not sure I entirely understand your comment. But let me = explain why we >> are gradually adding new flows: >>>>>=20 >>>>> 1. TCP-implementations have usually a fixed limit for the upper = bound of >> the receive window. In some networks that upper bound is lower than = the BDP of >> the network. Thus, the only way to reach full capacity is by having = multiple >> flows. >>>>> 2. Having multiple connections allows to quicker achieve full = capacity in >> high-RTT networks and thus speeds up the test-duration. >>>>> 3. In some networks with "random" packet-loss, congestion-control = may come >> in the way of achieving full capacity. Again, multiple flows will = work around >> that. >>>>=20 >>>> GIM>> I might have asked several questions at once. Let me clarify = what I >> am looking for: >>>>=20 >>>> As I understand the method of creating the "working conditions in a >> network" is based on certain assumptions. First, seems is that the = bandwidth >> is symmetrical between the measurement points. Second, that the = bandwidth >> doesn't change for the duration of the measurement session. AFAIK, in = the >> access networks, both are not necessarily always the case. >>>>=20 >>>> We don't have the assumption that bandwidth is symmetrical = (assuming, you >> mean uplink/downlink symmetry - please clarify otherwise). >>>>=20 >>>> The load-generating algorithm runs independently for uplink and = downlink >> traffic. And it is perfectly fine when both have huge asymmetry. >>>>=20 >>>>=20 >>>> Regarding the stability of the bandwidth: >>>> You are making a good point indeed that we assume that the = bandwidth is to >> some extend stable while ramping up the flows to "working = conditions". >> Admittedly that assumption does not always hold, and that is one of = the >> reasons why we try hard for the test to not take too long. >>>> I'm not sure how we could adjust the algorithm for varying = bandwidth >> without introducing too much complexity. I'm open for suggestions :-) >>>>=20 >>>> On the other hand, I might have missed how the method of creating = the >> "working conditions" guarantees a symmetrical load between the = measurement >> points. >>>>=20 >>>> As mentioned above, we don't assume a symmetrical load. Can you = show us >> where in the draft we give that impression, so we can fix that? >>>>=20 >>>>>=20 >>>>> Then, I find the motivation not to use time units to express the >> responsiveness metric not convincing: >>>>>=20 >>>>> "Latency" is a poor measure of responsiveness, since it can be = hard >>>>> for the general public to understand. The units are unfamiliar >>>>> ("what is a millisecond?") and counterintuitive ("100 msec - = that >>>>> sounds good - it's only a tenth of a second!"). >>>>>=20 >>>>>=20 >>>>> Can you expand on what exactly is not convincing to you? Do you = think that >> people will mis-understand the metric or that milli-seconds is the = right way >> to communicate responsiveness to the general public? >>>>=20 >>>> GIM>> Let me try. We know packet delay requirements for AR, VR >> applications. I believe that gamers are familiar with these numbers = too. The >> same is likely the case for the industrial automation use cases = served, for >> example, by Deterministic Networking. >>>>=20 >>>>=20 >>>> I can understand that for a technical audience, milli-seconds is = easy and >> familiar. A non-technical audience might be more open to accepting a = new >> "higher-is-better" metric. Responsiveness is something new and = abstract so, >> it's kind of natural that it comes with a new unit. >>>>=20 >>>> But I fully recognize that that's a controversial topic and can be >> discussed at length :) >>>>=20 >>>>=20 >>>> Cheers, >>>> Christoph >>>>=20 >>>>>=20 >>>>>=20 >>>>> Thanks a lot, >>>>> Christoph >>>>>=20 >>>>> [1] And there are many networks that prioritize ICMP pings, thus = we could >> observe even more different results based on what protocol is used to = measure >> the latency. >>>>>=20 >>>>>=20 >>>>> On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar >> > wrote: >>>>>>=20 >>>>>> Hi IPPM, >>>>>>=20 >>>>>>=20 >>>>>>=20 >>>>>> This email starts an adoption call for = draft-cpaasch-ippm-responsiveness, >> "Responsiveness under Working Conditions=E2=80=9D. This document = specifies the =E2=80=9CRPM >> Test=E2=80=9D for measuring user experience when the network is fully = loaded. The >> intended status of the document is Experimental. >>>>>>=20 >>>>>>=20 >>>>>>=20 >>>>>> = https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft- = >> cpaasch-ippm-responsiveness/__;!!BhdT!yrleDfru-45Lar4Qe5- >> 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU3zpKI3$ >>>>>>=20 >>>>>> = https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft- = = >> cpaasch-ippm-responsiveness-01__;!!BhdT!yrleDfru-45Lar4Qe5- >> 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPf9N-E8h$ >>>>>>=20 >>>>>>=20 >>>>>>=20 >>>>>> This adoption call will last until Monday, December 20. Please = review the >> document, and reply to this email thread to indicate if you think = IPPM should >> adopt this document. >>>>>>=20 >>>>>>=20 >>>>>>=20 >>>>>> BR, >>>>>>=20 >>>>>> Marcus >>>>>>=20 >>>>>>=20 >>>>>>=20 >>>>>> _______________________________________________ >>>>>> ippm mailing list >>>>>> ippm@ietf.org >>>>>>=20 >> = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = >> T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ >>>>>=20 >>>>> _______________________________________________ >>>>> ippm mailing list >>>>> ippm@ietf.org >>>>>=20 >> = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = >> T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ >>>>>=20 >>>>>=20 >>>>=20 >>>=20 >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>>=20 >> = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = >> T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ >>=20 >>=20 >>=20 >> -- >> I tried to build a better future, a few times: >> = https://urldefense.com/v3/__https://wayforward.archive.org/?site=3Dhttps*3= A*2F*2 = >> Fwww.icei.org__;JSUl!!BhdT!yrleDfru-45Lar4Qe5- >> 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPXLNE64R$ >>=20 >> Dave T=C3=A4ht CEO, TekLibre, LLC >>=20 >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = >> T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ --Apple-Mail=_7F0F1375-6931-4C55-A2AD-4E0E54064D68 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hello= Al,

          On Feb 16, 2022, at 8:07 AM, MORTON JR., AL = <acmorton@att.com> wrote:

          Hi Christoph,

          you wrote:
          I think what would be helpful would = be a section in the draft that explains the different sources of latency = (network, server, client) and how they affect the final RPM-number and = how one can separate out these two components. It is also important to = understand that the results are highly implementation-dependent. And = explaining that in this section should help, I believe.


          when you say, "...the results are highly = implementation-dependent.", 
          which = implementations are you referring to:

          Network path? Server? Client? "Working Load" conditions? 

          Network path, Server and Client. Because the layer = at which things are being measured is right above the HTTP layer. Thus, = implementation-details all the way from the PHY up to HTTP matter and = can influence the results.


          All of the above?

          Network implementation should influence the results, the = others not so much (with a standardized metric, we should have = equivalent results across implementations, at least that's what we said = in RFC6576/BCP176). And it can be rather difficult to separate the (I = count at least 4) results-influencing factors.

          I = think it is impossible to only have network implementation influence the = results. For example, if UDP is used to measure latency the entire = UDP-stack, IP-stack,... of the sender and receiver will influence the = results.

          In some way, sender and = receive UDP/IP/Driver/... stack is part of the "network implementation" = here.

          For the responsiveness it is = exactly the same. We use HTTP/2, and thus this is part of the "network = implementation".


          Does that make sense?


          Thanks,
          Christoph


          more stuff to = consider,
          Al


          -----Original Message-----
          From: ippm <ippm-bounces@ietf.org> On Behalf Of Dave Taht
          Sent: Tuesday, February 15, 2022 8:00 PM
          To: = Christoph Paasch <cpaasch=3D40apple.com@dmarc.ietf.org>
          Cc: Marcus Ihlar <marcus.ihlar=3D40ericsson.com@dmarc.ietf.org>; IETF = IPPM WG
          <ippm@ietf.org>
          Subject: Re: [ippm] = Adoption call for draft-cpaasch-ippm-responsiveness

          On Tue, Feb 15, 2022 at 4:11 PM Christoph Paasch
          <cpaasch=3D40apple.com@dmarc.ietf.org> wrote:

          Hello = Greg,

          On Feb 8, 2022, at 1:10 PM, Greg = Mirsky <gregimirsky@gmail.com> wrote:

          Hi Christoph,
          apologies for the belated = response and thank you for sharing interesting
          details of you using the measurement method. I = think that if the measurement
          method can not only provide = the Round-trip Per Minute (RPM) metric but expose
          the = network propagation and residential components of the round-trip = delay,
          then it seems to me, the scope of the draft to be = aligned with the charter of
          the IPPM WG and I'll be in = favor of the WG adoption of the work.
          What do you think? What is the opinion of the = authors and the WG?


          I am = assuming that with "residential components" you mean the = server/client-
          side contribution to the = measured latency, right?

          In that case, yes the method does allow to = separate these, as latency-probes
          are sent on = both the load-generating connections and on separate connections.
          The difference between the two represents the "server-side = contribution" to
          the latency.

          I= remember vividly how "neat" it seemed that QUIC had adopted the idea
          of an inband "ping" in version Q018 in 2012 (or so).

          https://urldefense.com/v3/__https://docs.google.com/document/d/= 1WJvyZflAO2pq77
          yOLbp9NsGjC1CHetAXV8I0fQe-B_U/edit__;!!BhdT!yrleDfru-45Lar4Qe5-=
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPeUiZuj5$
          Q018: Added a PING frame

          What I = don't remember or understand at the moment is I'm under the
          impression that's in the SSL layer as of http2.0? There a = good ref?




          I think = what would be helpful would be a section in the draft that explains
          the different sources of latency (network, = server, client) and how they affect
          the final RPM-number = and how one can separate out these two components. It is
          also important to understand that the results are highly = implementation-
          dependent. And explaining that in this = section should help, I believe.

          Would that be in line with what you are = looking for?


          Thanks,
          Christoph



          Regards,
          Greg

          On = Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch <cpaasch@apple.com> = wrote:

          Hello Greg,

          On Jan 6, 2022, at = 3:00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

          Hi Christoph,
          a happy and healthy New Year to = you and All!


          Happy New Year = to you as well!

          Thank you for your kind = consideration of my notes and detailed responses.
          Please find my follow-up notes = in-line below under the GIM>> tag.


          Thanks for your replies. Please see inline:

          On Wed, Jan 5, 2022 at 10:52 AM Christoph = Paasch <cpaasch@apple.com> wrote:

          Hello Greg,

          thanks for your comments. Please see inline:

          On Dec 22, 2021, at 11:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

          Dear Marcus, Authors, et al,
          apologies for the = belated response.
          I've read the draft and have some = comments to share with you:

          as I understand = it, the proposed new responsiveness metric is viewed as
          the single indicator = of a bufferbloat condition in a network. As I recall, the
          discussion at Measuring Network Quality for End-Users = workshop and on the
          mailing list indicated, that there=E2=80= =99s no consensus on what behaviors, symptoms
          can reliably = signal the bufferbloat.

          We are not trying for this responsiveness = metric to be "the single
          indicator of = bufferbloat". Bufferbloat can be measured in many different
          number of ways. And each of these will produce a correct, but = a different
          result. Thus, "bufferbloat" is whatever the = methodology tries to detect.

          Let me give an example of two methodologies = that are both correct but both
          will produce entirely = different numbers :

          If we would decide to generate the load by = flooding the network with UDP
          traffic from a = specific 4-tuple and measure latency with parallel ICMP pings.
          Then, on a over-buffered FIFO queue we would measure huge = latencies (thus
          correctly expose bufferbloat), while on a = FQ-codel queue we would not measure
          any bufferbloat.

          If on the = other hand, the load-generating traffic is changing the source-
          port for every single = UDP-packet, then in both the FIFO-queue and the FQ-codel
          queue we will measure huge amounts of bufferbloat.

          Thus, = these two methods both produced correct results but with hugely
          different numbers in = the FQ-codel case. [1]

          Now, while both methods measure some variant = of bufferbloat, they both
          don't measure a = realistic usage of the network.

          GIM>>= Thank you for the insights. It seems to me that what the method can
          demonstrate is rather the level of = efficiency of the AQM in the network for a
          particular = class of applications.


          Yes, that is a good description. It is for a "particular = class of
          applications" and we = are trying to make this class of applications
          representative= of a "typical user-scenario". (admittedly, we can debate
          forever on what kind of applications are representative and I = would love to
          have that debate :-)).

          On the point of "efficiency of the AQM". I = would go even further that it's
          not only AQM but also the client- = and server-side implementations of these
          applications (as = noted further below).




          That is why the "Responsiveness under working conditions" = tries to clearly
          specify how the load = is generated and how the latency is being measured. And
          it = does not measure "bufferbloat" but it measures "responsiveness under
          working conditions" based on the methodology that is being = used (using HTTP/2
          or HTTP/3, multiple flows, ...). It = does expose bufferbloat which can happen
          in the network. = It also exposes certain server-side behaviors that can cause
          (huge amounts of) additional latency - those behaviors are = typically not
          called "bufferbloat".

          GIM>> Thank you for pointing out that = the result of the RTT measurement has
          two contributing factors - network = and server.


          Yes, servers = contribute as do the client-side implementations. It's all
          three (client, network, server) = that need to work "correctly" to achieve good
          responsiveness. Btw., as we are now gathering more experience = with our
          methodology in different environments we find = that the biggest portions of
          latency actually come from = the server-side. We see several seconds of latency
          introduced by the HTTP/2 and TCP implementations.

          It seems worth enhancing the method to = localize each contribution and
          measure them separately.


          With the latency measuring = probes being sent on load-bearing connections
          and separate connections and with = the separate connections serving to measure
          DNS/TCP/... = individually, the different data-points actually allow to localize
          to some extend.

          However, = I would be reluctant to dive too deep into localization/trouble-
          shooting/debugging of networks as = part of this I-D. As this opens a whole new
          can of worms. = We could then start thinking about sending latency-probes while
          playing with the IP TTL to find which router is introducing = the latency,...
          It's an entirely different research-topic = IMO :-) Dave Taht was thinking of
          starting something along = these lines
          (https://urldefense.com/v3/__https://github.com/dtaht/wtbb__;!!B= hdT!yrleDfru-
          45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPRghwEjg$ ).

          It seems = that it would be reasonable to first define what is being
          measured, = characterized by the responsiveness metric. Having a document that
          discusses and defines the bufferbloat would be great.

          I agree = that there is a lack of definition for what "bufferbloat" really
          is.

          The way = we look at "responsiveness under working conditions" is that it
          measures the latency = in conditions that may realistically happen in worst-case
          scenarios with end-users/implementations that are = non-malicious (non-malicious
          to exclude the UDP-flooding = scenario).

          Thus, I assume we should make a better job at explaining = this. The lack of
          a = formal definition of "bufferbloat" doesn't help and thus we are indeed = using
          this term a bit freely in the current draft. We will = improve the Introduction
          to better set the stage
          (https://urldefense.com/v3/__https://github.com/network-quality/= draft-cpaasch-
          ippm-responsiveness/issues/31__;!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU0pYBOv$ ).

          It seems = like in the foundation of the methodology described in the draft
          lies the assumption = that without adding new flows the available bandwidth is
          constant, does not change. While that is mostly the case, = there are
          technologies that behave differently and may = change bandwidth because of the
          outside conditions. Some = of these behaviors of links with variable discrete
          bandwidth= are discussed in, for example, RFC 8330 and RFC 8625.

          I'm not = sure I entirely understand your comment. But let me explain why we
          are gradually adding = new flows:

          1. TCP-implementations have usually a fixed limit for the = upper bound of
          the = receive window. In some networks that upper bound is lower than the BDP = of
          the network. Thus, the only way to reach full capacity = is by having multiple
          flows.
          2. Having multiple connections allows to = quicker achieve full capacity in
          high-RTT networks and = thus speeds up the test-duration.
          3. In some networks with "random" packet-loss, = congestion-control may come
          in the way of = achieving full capacity. Again, multiple flows will work around
          that.

          GIM>>= I might have asked several questions at once. Let me clarify what I
          am looking for:

          As I understand the method of creating the = "working conditions in a
          network" = is based on certain assumptions. First, seems is that the bandwidth
          is symmetrical between the measurement points. Second, that = the bandwidth
          doesn't change for the duration of the = measurement session. AFAIK, in the
          access networks, both = are not necessarily always the case.

          We don't have the assumption that bandwidth is symmetrical = (assuming, you
          mean = uplink/downlink symmetry - please clarify otherwise).

          The load-generating algorithm runs = independently for uplink and downlink
          traffic. And it is perfectly fine = when both have huge asymmetry.


          Regarding the stability of the bandwidth:
          You = are making a good point indeed that we assume that the bandwidth is = to
          some extend stable while = ramping up the flows to "working conditions".
          Admittedly = that assumption does not always hold, and that is one of the
          reasons why we try hard for the test to not take too long.
          I'm not sure how we could adjust the algorithm for varying = bandwidth
          without introducing = too much complexity. I'm open for suggestions :-)

          On the other hand, I might have missed how the = method of creating the
          "working = conditions" guarantees a symmetrical load between the measurement
          points.

          As = mentioned above, we don't assume a symmetrical load. Can you show us
          where in the draft we give that = impression, so we can fix that?


          Then, I find the motivation not = to use time units to express the
          responsiveness metric = not convincing:

            "Latency" is a poor measure of = responsiveness, since it can be hard
            for the = general public to understand.  The units are unfamiliar
            ("what is a millisecond?") and counterintuitive = ("100 msec - that
            sounds good - it's only a = tenth of a second!").


          Can = you expand on what exactly is not convincing to you? Do you think = that
          people will = mis-understand the metric or that milli-seconds is the right way
          to communicate responsiveness to the general public?

          GIM>> Let me try. We know packet delay = requirements for AR, VR
          applications. I believe that gamers = are familiar with these numbers too. The
          same is likely = the case for the industrial automation use cases served, for
          example, by Deterministic Networking.


          I can understand that for a technical = audience, milli-seconds is easy and
          familiar. A non-technical audience = might be more open to accepting a new
          "higher-is-better" = metric. Responsiveness is something new and abstract so,
          it's kind of natural that it comes with a new unit.

          But I fully recognize that that's a = controversial topic and can be
          discussed at length :)


          Cheers,
          Christoph



          Thanks a lot,
          Christoph

          [1] And there are many = networks that prioritize ICMP pings, thus we could
          observe even more = different results based on what protocol is used to measure
          the latency.


          On Mon, Dec 6, 2021 at 7:53 AM = Marcus Ihlar
          <marcus.ihlar=3D40ericsson.com@dmarc.ietf.org> = wrote:

          Hi IPPM,



          This email starts an adoption = call for draft-cpaasch-ippm-responsiveness,
          "Responsive= ness under Working Conditions=E2=80=9D. This document specifies the = =E2=80=9CRPM
          Test=E2=80=9D for measuring user experience = when the network is fully loaded. The
          intended status of = the document is Experimental.



          https://urldefense.com/v3/__https://datatracker.ietf.org/doc/dr= aft-
          cpaasch-ipp= m-responsiveness/__;!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU3zpKI3$

          https://urldefense.com/v3/__https://datatracker.ietf.org/doc/ht= ml/draft-
          cpaasch-ipp= m-responsiveness-01__;!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPf9N-E8h$



          This adoption = call will last until Monday, December 20. Please review the
          document, = and reply to this email thread to indicate if you think IPPM should
          adopt this document.



          BR,

          Marcus



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          T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$=



          --
          I tried to build a better future, a few times:
          https://urldefense.com/v3/__https://wayforward.archive.org/?sit= e=3Dhttps*3A*2F*2
          Fwww.icei.org__;JSUl!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPXLNE64R$

          Dave T=C3=A4ht CEO, TekLibre, LLC

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b0a12d61-60de-4c34-8d57-5b2140da8a3c X-V-A: X-V-T-CD: c1b389506f216bb3aba14cffce0c1559 X-V-E-CD: 1590bd97d4a8f4c219cc5781a18903f3 X-V-R-CD: 48bfdd15d595f498ee41f6dda6ee8027 X-V-CD: 0 X-V-ID: 8197d0a7-e546-43fe-b7f1-284cd5310b37 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.425, 18.0.816 definitions=2022-02-22_08:2022-02-21, 2022-02-22 signatures=0 Received: from smtpclient.apple (unknown [17.234.93.253]) by rn-mailsvcp-mmp-lapp04.rno.apple.com (Oracle Communications Messaging Server 8.1.0.12.20210903 64bit (built Sep 3 2021)) with ESMTPSA id <0R7Q00357E6S7500@rn-mailsvcp-mmp-lapp04.rno.apple.com>; Tue, 22 Feb 2022 16:18:29 -0800 (PST) From: Tommy Pauly Message-id: <3E3EB1EA-4D7A-42B8-A2FD-CA874C8072C0@apple.com> Content-type: multipart/alternative; boundary="Apple-Mail=_09985609-606C-49EA-8777-0215BCD78521" MIME-version: 1.0 (Mac OS X Mail 15.0 \(3691.0.3\)) Date: Tue, 22 Feb 2022 16:18:28 -0800 In-reply-to: Cc: "ippm@ietf.org" , IPPM Chairs To: "Frank Brockners (fbrockne)" References: X-Mailer: Apple Mail (2.3691.0.3) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.425, 18.0.816 definitions=2022-02-22_08:2022-02-21, 2022-02-22 signatures=0 Archived-At: Subject: Re: [ippm] Refresh of IOAM drafts for "raw export" and "ethertype encap" X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Feb 2022 00:18:37 -0000 --Apple-Mail=_09985609-606C-49EA-8777-0215BCD78521 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Frank, I recall this being presented several years ago. In that discussion, the = discussion of allocating an Ethertype was something that was going to = need to be brought up with IEEE. Was this done at any point? I=E2=80=99d also like to understand how many people would intend to = adopt and use these specifications; the ethertype specifically seems = like it is not part of the remit of this group (unless we have a = particular drive for it), and this could be progressed another way. Thanks, Tommy > On Feb 21, 2022, at 3:57 AM, Frank Brockners (fbrockne) = wrote: >=20 > Dear IPPM, > =20 > new versions of=20 > * =E2=80=9CEtherType Protocol Identification of In-situ OAM Data=E2=80=9D= (draft-weis-ippm-ioam-eth-05) and > * =E2=80=9CIn-situ OAM raw data export with IPFIX=E2=80=9D = (draft-spiegel-ippm-ioam-rawexport-06) > are now available.=20 > =20 > I decided to refresh the drafts, to allow for a discussion at our = upcoming meeting on the path forward for the two drafts. Both drafts are = around for quite some time =E2=80=93 and haven=E2=80=99t seen a lot of = updates nor discussion recently. In the past, we considered both drafts = as important: The =E2=80=9CEthertype encap=E2=80=9D, because it allowed = for a generic approach to carry IOAM data fields with GRE or Geneve; the = =E2=80=9Craw export=E2=80=9D, because we considered a standards-based = approach to export IOAM data from a node as important (given that right = now, different implementations follow their own approach). > =20 > Tommy, Marcus =E2=80=93 it would be great if you could allocate a = brief slot on the IPPM WG agenda for the discussion, with the objective = to decide whether we want to evolve the drafts and WG-adopt them. > =20 > Thanks a lot, Frank --Apple-Mail=_09985609-606C-49EA-8777-0215BCD78521 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi = Frank,

          I recall this = being presented several years ago. In that discussion, the discussion of = allocating an Ethertype was something that was going to need to be = brought up with IEEE. Was this done at any point?
          I=E2=80=99d also like to understand = how many people would intend to adopt and use these specifications; the = ethertype specifically seems like it is not part of the remit of this = group (unless we have a particular drive for it), and this could be = progressed another way.

          Thanks,
          Tommy

          On Feb = 21, 2022, at 3:57 AM, Frank Brockners (fbrockne) <fbrockne@cisco.com> = wrote:

          Dear IPPM,
           
          new versions of 
          * =E2=80=9CEtherType Protocol Identification of In-situ OAM = Data=E2=80=9D (draft-weis-ippm-ioam-eth-05) and
          * =E2=80=9CIn-situ OAM raw data export with IPFIX=E2=80=9D = (draft-spiegel-ippm-ioam-rawexport-06)
          are now available. 
           
          I decided to refresh the drafts, to allow for = a discussion at our upcoming meeting on the path forward for the two = drafts. Both drafts are around for quite some time =E2=80=93 and = haven=E2=80=99t seen a lot of updates nor discussion recently. In the = past, we considered both drafts as important: The =E2=80=9CEthertype = encap=E2=80=9D, because it allowed for a generic approach to carry IOAM = data fields with GRE or Geneve; the =E2=80=9Craw export=E2=80=9D, = because we considered a standards-based approach to export IOAM data = from a node as important (given that right now, different = implementations follow their own approach).
           
          Tommy, Marcus =E2=80=93 it would be great if = you could allocate a brief slot on the IPPM WG agenda for the = discussion, with the objective to decide whether we want to evolve the = drafts and WG-adopt them.
           
          Thanks a lot, = Frank

          = --Apple-Mail=_09985609-606C-49EA-8777-0215BCD78521-- From nobody Wed Feb 23 02:43:54 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 29A763A0A48; Wed, 23 Feb 2022 02:43:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=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 C9Z4fqXEA5OW; Wed, 23 Feb 2022 02:43:48 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F6F63A0A36; Wed, 23 Feb 2022 02:43:48 -0800 (PST) Received: from fraeml711-chm.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K3XZp0Ndyz6890h; Wed, 23 Feb 2022 18:38:58 +0800 (CST) Received: from fraeml714-chm.china.huawei.com (10.206.15.33) by fraeml711-chm.china.huawei.com (10.206.15.60) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Wed, 23 Feb 2022 11:43:45 +0100 Received: from fraeml714-chm.china.huawei.com ([10.206.15.33]) by fraeml714-chm.china.huawei.com ([10.206.15.33]) with mapi id 15.01.2308.021; Wed, 23 Feb 2022 11:43:44 +0100 From: Giuseppe Fioccola To: Giuseppe Fioccola , "Martin Duke" , IETF IPPM WG CC: "draft-fioccola-rfc8321bis.all@ietf.org" , "draft-fioccola-rfc8889bis.all@ietf.org" Thread-Topic: RFC8321bis and RFC8889bis: draft-02 Thread-Index: AdgkATgXIMY0zCqzTny6KOgRPKluEwEmo+1Q Date: Wed, 23 Feb 2022 10:43:44 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.48.219.177] Content-Type: multipart/alternative; boundary="_000_bf1e9f55e4324c3c93584a24083fc1fchuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [ippm] RFC8321bis and RFC8889bis: draft-02 X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Feb 2022 10:43:53 -0000 --_000_bf1e9f55e4324c3c93584a24083fc1fchuaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear Martin, As promised, I just published revision -03 of RFC8321bis. I also updated RFC8889bis accordingly. All the modifications are recorded in the Changes Log. I think we can now take it through IETF Last Call. Regards, Giuseppe (on behalf of co-authors) From: ippm On Behalf Of Giuseppe Fioccola Sent: Thursday, February 17, 2022 2:24 PM To: Martin Duke ; IETF IPPM WG Cc: draft-fioccola-rfc8321bis.all@ietf.org; draft-fioccola-rfc8889bis.all@i= etf.org Subject: [ippm] RFC8321bis and RFC8889bis: draft-02 Hi Martin, All, Please note that I just submitted new revisions of both RFC8321bis and RFC8= 889bis. I tried to address the latest comments. I plan to submit revision -03 of RFC8321bis early next week for the IETF La= st Call. https://datatracker.ietf.org/doc/draft-fioccola-rfc8321bis/ https://datatracker.ietf.org/doc/draft-fioccola-rfc8889bis/ Reviews and suggestions will be welcome. Regards, Giuseppe --_000_bf1e9f55e4324c3c93584a24083fc1fchuaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

          Dear Martin,

          As promised, I just published revision -03 of RFC832= 1bis.

          I also updated RFC8889bis accordingly.

          All the modifications are recorded in the Changes Lo= g.

           

          I think we can now take it through IETF Last Call.

           

          Regards,

           

          Giuseppe (on behalf of co-authors)

           

          From: ippm <ippm-bounces@ietf.org> O= n Behalf Of Giuseppe Fioccola
          Sent: Thursday, February 17, 2022 2:24 PM
          To: Martin Duke <martin.h.duke@gmail.com>; IETF IPPM WG <ip= pm@ietf.org>
          Cc: draft-fioccola-rfc8321bis.all@ietf.org; draft-fioccola-rfc8889bi= s.all@ietf.org
          Subject: [ippm] RFC8321bis and RFC8889bis: draft-02

           

          Hi Martin, All,

          Please note that I just submitted new revisions of b= oth RFC8321bis and RFC8889bis.

          I tried to address the latest comments.

           

          I plan to submit revision -03 of RFC8321bis early ne= xt week for the IETF Last Call.

           

          https://datatracker.ietf.org/doc/draft-fioccola-rfc8321= bis/

          https://datatracker.ietf.org/doc/draft-fioccola-rfc8889= bis/

           

          Reviews and suggestions will be welcome.<= /p>

           

          Regards,

           

          Giuseppe

           

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identity=helo; client-ip=128.65.195.6; receiver=alln-inbound-d.cisco.com; envelope-from="ietf@trammell.ch"; x-sender="postmaster@smtp-sh2.infomaniak.ch"; x-conformance=spf_only x-ms-exchange-organization-originalclientipaddress: 173.37.142.92 x-ms-exchange-organization-originalserveripaddress: 10.152.69.34 x-ms-publictraffictype: Email X-Microsoft-Antispam-Mailbox-Delivery: ucf:0; jmr:0; ex:0; auth:0; dest:I; ENG:(750119)(520011016)(944506303)(944626516); X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?8AYlaDGUNCU7jjsg/wTTJHYYukhhyH+UkLqVsxUhVFO6RqsYfdacP1BfQy9X?= =?us-ascii?Q?EZaJ0wlR2rvaahclbBcBui8Ojs20v92Jkxu6jQ+4C91WlrKPknLwmQv87IQu?= =?us-ascii?Q?dRe4Et2MnDdH2D2CVOzbFee+F6wWvRX+ofIsCr/2KjmqCzGv3pTlSYk0YoWO?= =?us-ascii?Q?NVp07BWA4EQp4zZXEec26X9bfLsrHBM8uF6+PuoXkUPdFzD3LXRWjoOloYL3?= =?us-ascii?Q?JqRwd09+s2ywUyMKDBEzXgYSDZWl0T0Hyk/s9NM3esajXrmYIYxrpPlhyQmy?= =?us-ascii?Q?UAR0LcWQsvqwCYhFaR9OUy10jEGHrk5cxp5SvMzgUa8RS6/kuSSikH6FTbUv?= 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this is very helpful. We'll have to have a discussion in the WG as to the process tradeoffs here. Cheers, Brian > On 27 Mar 2019, at 10:37, Donald Eastlake wrote: > > Hi, > > So, a bunch of things: > > The IANA registry for Ethertypes is Informational. The authority for > Ethertype assignment is the IEEE Registration Authority (RA), > available at https://standards.ieee.org/products-services/regauth/index.h= tml. > Normally there would be no charge by the IEEE for an Ethertype > assigned for standards use in the IETF. > > There are two "Local Experimental" EtherTypes assigned by IEEE for > experimentation/development: 0x88B5 and 0x88B6. > > The IESG has established a policy on IETF requests for Ethertypes, > documented here: > https://www6.ietf.org/iesg/statement/ethertypes.html > > This is all a fairly heavyweight process. I don't follow IPPM but I > think it unlikely the IESG would approve your applying for an > Ethertype assignment without WG adoption and WG consensus for the > draft. > > When an Ethertype assignment request gets to the IEEE RA, one thing > they look for is a version number in the information identified by > that Ethertype. Since Ethertypes are a limited resource, they do not > want you coming back asking for another one just because your > information has changed a bit. > > Hope the above helps. Feel free to ask if you have more questions. > > Thanks, > Donald > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D > Donald E. Eastlake 3rd +1-508-333-2270 (cell) > 1424 Pro Shop Court, Davenport, FL 33896 USA > d3e3e3@gmail.com > > > On Mon, Mar 25, 2019 at 6:45 AM Brian Trammell (IETF) = wrote: >> >> hi Donald, >> >> I'm writing you in your capacity as the IANA expert for the ethertypes r= egistry. IPPM discussed draft-weis-ippm-ioam-eth today, which wants to allo= cate an ethertype to be used for IOAM (In-Situ OAM, which adds metadata to = tunnels for measurement purposes) in protocols that use ethertypes as a nex= t-protocol header (GRE and Geneve); as IPPM chair, I took an AI to help the= m figure out the right way to do this. >> >> Can you point us to the process here, or is "ask IANA to ask the expert"= the process? >> >> Thanks, cheers, >> >> Brian > --_004_CY4PR11MB1672F8771A587E6AD4007E71DA3C9CY4PR11MB1672namp_-- From nobody Wed Feb 23 11:44:25 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E6D73A0BD2 for ; Wed, 23 Feb 2022 11:44:14 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.673 X-Spam-Level: X-Spam-Status: No, score=-2.673 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.576, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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Wed, 23 Feb 2022 11:43:57 -0800 (PST) From: Christoph Paasch Message-id: Content-type: multipart/alternative; boundary="Apple-Mail=_A267F392-12F3-41E8-8758-E36CC38B3A66" MIME-version: 1.0 (Mac OS X Mail 16.0 \(3696.80.82.1.1\)) Date: Wed, 23 Feb 2022 11:43:56 -0800 In-reply-to: Cc: Dave Taht , Marcus Ihlar , IETF IPPM WG To: "MORTON JR., AL" References: <3DC3F6B6-229E-46C6-BD84-2A6A7FE6DD48@apple.com> <9340CFDA-079C-4490-A01C-EB863D365F8F@apple.com> <74A71CF0-16BA-4403-B2DD-D2DAA264E2CA@apple.com> X-Mailer: Apple Mail (2.3696.80.82.1.1) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.425, 18.0.816 definitions=2022-02-23_09:2022-02-23, 2022-02-23 signatures=0 Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 23 Feb 2022 19:44:22 -0000 --Apple-Mail=_A267F392-12F3-41E8-8758-E36CC38B3A66 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hello Al, please see inline: > On Feb 20, 2022, at 9:37 AM, MORTON JR., AL wrote: >=20 > Hi Christoph, > Thanks for continuing this discussion. Allow me to reply and add my = view below, > Al > =20 > From: Christoph Paasch >=20= > Sent: Thursday, February 17, 2022 7:24 PM > To: MORTON JR., AL > > Cc: Dave Taht >; = Marcus Ihlar >; IETF IPPM WG > > Subject: Re: [ippm] Adoption call for = draft-cpaasch-ippm-responsiveness > =20 > Hello Al, >=20 >=20 > On Feb 16, 2022, at 8:07 AM, MORTON JR., AL > wrote: > =20 > Hi Christoph, >=20 > you wrote: >=20 > I think what would be helpful would be a section in the draft that = explains the different sources of latency (network, server, client) and = how they affect the final RPM-number and how one can separate out these = two components. It is also important to understand that the results are = highly implementation-dependent. And explaining that in this section = should help, I believe. >=20 >=20 > when you say, "...the results are highly implementation-dependent.",=20= > which implementations are you referring to: >=20 > Network path? Server? Client? "Working Load" conditions?=20 > =20 > Network path, Server and Client. Because the layer at which things are = being measured is right above the HTTP layer. Thus, = implementation-details all the way from the PHY up to HTTP matter and = can influence the results. >=20 > All of the above? >=20 > Network implementation should influence the results, the others not so = much (with a standardized metric, we should have equivalent results = across implementations, at least that's what we said in RFC6576/BCP176). = And it can be rather difficult to separate the (I count at least 4) = results-influencing factors. > =20 > I think it is impossible to only have network implementation influence = the results. For example, if UDP is used to measure latency the entire = UDP-stack, IP-stack,... of the sender and receiver will influence the = results. > [acm] > Agreed, although the one-to-one correspondence of packets on the wire = and UDP datagrams is an advantage with UDP measurements. Many = measurement systems use UDP today, and it has been straightforward to = calibrate the delay introduced by the host stack and remove that = component when necessary (within a tolerance of variation appropriate = for network measurements, it may be nearly deterministic). > =20 > In some way, sender and receive UDP/IP/Driver/... stack is part of the = "network implementation" here. > [acm] > We have performed the calibrations of the stack so that we can = continue to use the notion of =E2=80=9Cwire-time=E2=80=9D (that separate = stack from network). > =20 > For the responsiveness it is exactly the same. We use HTTP/2, and thus = this is part of the "network implementation". > [acm] > I would like to see more on this, because: > I haven=E2=80=99t measured or attempted to calibrate delays this high = in the stack myself. But I suspect there may be less determinism and = more host processing time/variation compared to UDP delay measurements. = This is one place that new forms of implementation dependence might = creep-in, in addition to the aspect of Working-Load generation (another = possible implementation-dependency mentioned above). The methodology does allow to some extend factor out network-latency = from end-host latency by sending probes on load-generating and separate = connections. So, that should allow to calibrate things to some extend. Now, with these discussion I am wondering about one thing: Why would one want to calibrate out the end-host latency from the = measurement? Sure, when trying to debug things to identify the sources = of bufferbloat. But for debugging the method described in the draft is a = very poor tool. When I'm debugging bufferbloat, I resort back to = traceroute, tcptraceroute, ping, iperf, curl,... So, I don't fully understand why one would want to calibrate the = end-host latency away from the measurement. Because, at the end that is = what the end-users are experiencing and so I want to measure it entirely = end-to-end. Responsiveness really is a metric that is focused on the = end-user and not the network in isolation. Christoph > =20 > =20 > Does that make sense? > =20 > =20 > Thanks, > Christoph >=20 >=20 >=20 > more stuff to consider, > Al >=20 >=20 >=20 > -----Original Message----- > From: ippm > On = Behalf Of Dave Taht > Sent: Tuesday, February 15, 2022 8:00 PM > To: Christoph Paasch > > Cc: Marcus Ihlar >; IETF IPPM WG > > > Subject: Re: [ippm] Adoption call for = draft-cpaasch-ippm-responsiveness >=20 > On Tue, Feb 15, 2022 at 4:11 PM Christoph Paasch > > wrote: >=20 >=20 > Hello Greg, >=20 > On Feb 8, 2022, at 1:10 PM, Greg Mirsky > wrote: >=20 > Hi Christoph, > apologies for the belated response and thank you for sharing = interesting > details of you using the measurement method. I think that if the = measurement > method can not only provide the Round-trip Per Minute (RPM) metric but = expose > the network propagation and residential components of the round-trip = delay, > then it seems to me, the scope of the draft to be aligned with the = charter of > the IPPM WG and I'll be in favor of the WG adoption of the work. >=20 > What do you think? What is the opinion of the authors and the WG? >=20 >=20 > I am assuming that with "residential components" you mean the = server/client- > side contribution to the measured latency, right? >=20 >=20 > In that case, yes the method does allow to separate these, as = latency-probes > are sent on both the load-generating connections and on separate = connections. > The difference between the two represents the "server-side = contribution" to > the latency. >=20 > I remember vividly how "neat" it seemed that QUIC had adopted the idea > of an inband "ping" in version Q018 in 2012 (or so). >=20 > = https://urldefense.com/v3/__https://docs.google.com/document/d/1WJvyZflAO2= pq77 = > yOLbp9NsGjC1CHetAXV8I0fQe-B_U/edit__;!!BhdT!yrleDfru-45Lar4Qe5- > 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPeUiZuj5$ > Q018: Added a PING frame >=20 > What I don't remember or understand at the moment is I'm under the > impression that's in the SSL layer as of http2.0? There a good ref? >=20 >=20 >=20 >=20 >=20 > I think what would be helpful would be a section in the draft that = explains > the different sources of latency (network, server, client) and how = they affect > the final RPM-number and how one can separate out these two = components. It is > also important to understand that the results are highly = implementation- > dependent. And explaining that in this section should help, I believe. >=20 >=20 > Would that be in line with what you are looking for? >=20 >=20 > Thanks, > Christoph >=20 >=20 >=20 > Regards, > Greg >=20 > On Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch > wrote: >=20 >=20 > Hello Greg, >=20 > On Jan 6, 2022, at 3:00 PM, Greg Mirsky > wrote: >=20 > Hi Christoph, > a happy and healthy New Year to you and All! >=20 >=20 > Happy New Year to you as well! >=20 > Thank you for your kind consideration of my notes and detailed = responses. > Please find my follow-up notes in-line below under the GIM>> tag. >=20 >=20 >=20 > Thanks for your replies. Please see inline: >=20 > On Wed, Jan 5, 2022 at 10:52 AM Christoph Paasch > wrote: >=20 >=20 > Hello Greg, >=20 > thanks for your comments. Please see inline: >=20 > On Dec 22, 2021, at 11:43 PM, Greg Mirsky > wrote: >=20 > Dear Marcus, Authors, et al, > apologies for the belated response. > I've read the draft and have some comments to share with you: >=20 > as I understand it, the proposed new responsiveness metric is viewed = as > the single indicator of a bufferbloat condition in a network. As I = recall, the > discussion at Measuring Network Quality for End-Users workshop and on = the > mailing list indicated, that there=E2=80=99s no consensus on what = behaviors, symptoms > can reliably signal the bufferbloat. >=20 >=20 > We are not trying for this responsiveness metric to be "the single > indicator of bufferbloat". Bufferbloat can be measured in many = different > number of ways. And each of these will produce a correct, but a = different > result. Thus, "bufferbloat" is whatever the methodology tries to = detect. >=20 >=20 > Let me give an example of two methodologies that are both correct but = both > will produce entirely different numbers : >=20 >=20 > If we would decide to generate the load by flooding the network with = UDP > traffic from a specific 4-tuple and measure latency with parallel ICMP = pings. > Then, on a over-buffered FIFO queue we would measure huge latencies = (thus > correctly expose bufferbloat), while on a FQ-codel queue we would not = measure > any bufferbloat. >=20 >=20 > If on the other hand, the load-generating traffic is changing the = source- > port for every single UDP-packet, then in both the FIFO-queue and the = FQ-codel > queue we will measure huge amounts of bufferbloat. >=20 >=20 > Thus, these two methods both produced correct results but with hugely > different numbers in the FQ-codel case. [1] >=20 >=20 > Now, while both methods measure some variant of bufferbloat, they both > don't measure a realistic usage of the network. >=20 >=20 > GIM>> Thank you for the insights. It seems to me that what the method = can > demonstrate is rather the level of efficiency of the AQM in the = network for a > particular class of applications. >=20 >=20 >=20 > Yes, that is a good description. It is for a "particular class of > applications" and we are trying to make this class of applications > representative of a "typical user-scenario". (admittedly, we can = debate > forever on what kind of applications are representative and I would = love to > have that debate :-)). >=20 >=20 > On the point of "efficiency of the AQM". I would go even further that = it's > not only AQM but also the client- and server-side implementations of = these > applications (as noted further below). >=20 >=20 >=20 >=20 >=20 >=20 > That is why the "Responsiveness under working conditions" tries to = clearly > specify how the load is generated and how the latency is being = measured. And > it does not measure "bufferbloat" but it measures "responsiveness = under > working conditions" based on the methodology that is being used (using = HTTP/2 > or HTTP/3, multiple flows, ...). It does expose bufferbloat which can = happen > in the network. It also exposes certain server-side behaviors that can = cause > (huge amounts of) additional latency - those behaviors are typically = not > called "bufferbloat". >=20 >=20 > GIM>> Thank you for pointing out that the result of the RTT = measurement has > two contributing factors - network and server. >=20 >=20 >=20 > Yes, servers contribute as do the client-side implementations. It's = all > three (client, network, server) that need to work "correctly" to = achieve good > responsiveness. Btw., as we are now gathering more experience with our > methodology in different environments we find that the biggest = portions of > latency actually come from the server-side. We see several seconds of = latency > introduced by the HTTP/2 and TCP implementations. >=20 >=20 > It seems worth enhancing the method to localize each contribution and > measure them separately. >=20 >=20 >=20 > With the latency measuring probes being sent on load-bearing = connections > and separate connections and with the separate connections serving to = measure > DNS/TCP/... individually, the different data-points actually allow to = localize > to some extend. >=20 >=20 > However, I would be reluctant to dive too deep into = localization/trouble- > shooting/debugging of networks as part of this I-D. As this opens a = whole new > can of worms. We could then start thinking about sending = latency-probes while > playing with the IP TTL to find which router is introducing the = latency,... > It's an entirely different research-topic IMO :-) Dave Taht was = thinking of > starting something along these lines > = (https://urldefense.com/v3/__https://github.com/dtaht/wtbb__;!!BhdT!yrleDf= ru- = > 45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPRghwEjg$ ). >=20 >=20 >=20 > It seems that it would be reasonable to first define what is being > measured, characterized by the responsiveness metric. Having a = document that > discusses and defines the bufferbloat would be great. >=20 >=20 > I agree that there is a lack of definition for what "bufferbloat" = really > is. >=20 >=20 > The way we look at "responsiveness under working conditions" is that = it > measures the latency in conditions that may realistically happen in = worst-case > scenarios with end-users/implementations that are non-malicious = (non-malicious > to exclude the UDP-flooding scenario). >=20 >=20 > Thus, I assume we should make a better job at explaining this. The = lack of > a formal definition of "bufferbloat" doesn't help and thus we are = indeed using > this term a bit freely in the current draft. We will improve the = Introduction > to better set the stage > = (https://urldefense.com/v3/__https://github.com/network-quality/draft-cpaa= sch- = > ippm-responsiveness/issues/31__;!!BhdT!yrleDfru-45Lar4Qe5- > 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU0pYBOv$ ). >=20 >=20 > It seems like in the foundation of the methodology described in the = draft > lies the assumption that without adding new flows the available = bandwidth is > constant, does not change. While that is mostly the case, there are > technologies that behave differently and may change bandwidth because = of the > outside conditions. Some of these behaviors of links with variable = discrete > bandwidth are discussed in, for example, RFC 8330 and RFC 8625. >=20 >=20 > I'm not sure I entirely understand your comment. But let me explain = why we > are gradually adding new flows: >=20 >=20 > 1. TCP-implementations have usually a fixed limit for the upper bound = of > the receive window. In some networks that upper bound is lower than = the BDP of > the network. Thus, the only way to reach full capacity is by having = multiple > flows. >=20 > 2. Having multiple connections allows to quicker achieve full capacity = in > high-RTT networks and thus speeds up the test-duration. >=20 > 3. In some networks with "random" packet-loss, congestion-control may = come > in the way of achieving full capacity. Again, multiple flows will work = around > that. >=20 >=20 > GIM>> I might have asked several questions at once. Let me clarify = what I > am looking for: >=20 >=20 > As I understand the method of creating the "working conditions in a > network" is based on certain assumptions. First, seems is that the = bandwidth > is symmetrical between the measurement points. Second, that the = bandwidth > doesn't change for the duration of the measurement session. AFAIK, in = the > access networks, both are not necessarily always the case. >=20 >=20 > We don't have the assumption that bandwidth is symmetrical (assuming, = you > mean uplink/downlink symmetry - please clarify otherwise). >=20 >=20 > The load-generating algorithm runs independently for uplink and = downlink > traffic. And it is perfectly fine when both have huge asymmetry. >=20 >=20 >=20 > Regarding the stability of the bandwidth: > You are making a good point indeed that we assume that the bandwidth = is to > some extend stable while ramping up the flows to "working conditions". > Admittedly that assumption does not always hold, and that is one of = the > reasons why we try hard for the test to not take too long. >=20 > I'm not sure how we could adjust the algorithm for varying bandwidth > without introducing too much complexity. I'm open for suggestions :-) >=20 >=20 > On the other hand, I might have missed how the method of creating the > "working conditions" guarantees a symmetrical load between the = measurement > points. >=20 >=20 > As mentioned above, we don't assume a symmetrical load. Can you show = us > where in the draft we give that impression, so we can fix that? >=20 >=20 >=20 >=20 > Then, I find the motivation not to use time units to express the > responsiveness metric not convincing: >=20 >=20 > "Latency" is a poor measure of responsiveness, since it can be hard > for the general public to understand. The units are unfamiliar > ("what is a millisecond?") and counterintuitive ("100 msec - that > sounds good - it's only a tenth of a second!"). >=20 >=20 > Can you expand on what exactly is not convincing to you? Do you think = that > people will mis-understand the metric or that milli-seconds is the = right way > to communicate responsiveness to the general public? >=20 >=20 > GIM>> Let me try. We know packet delay requirements for AR, VR > applications. I believe that gamers are familiar with these numbers = too. The > same is likely the case for the industrial automation use cases = served, for > example, by Deterministic Networking. >=20 >=20 >=20 > I can understand that for a technical audience, milli-seconds is easy = and > familiar. A non-technical audience might be more open to accepting a = new > "higher-is-better" metric. Responsiveness is something new and = abstract so, > it's kind of natural that it comes with a new unit. >=20 >=20 > But I fully recognize that that's a controversial topic and can be > discussed at length :) >=20 >=20 >=20 > Cheers, > Christoph >=20 >=20 >=20 >=20 > Thanks a lot, > Christoph >=20 > [1] And there are many networks that prioritize ICMP pings, thus we = could > observe even more different results based on what protocol is used to = measure > the latency. >=20 >=20 >=20 > On Mon, Dec 6, 2021 at 7:53 AM Marcus Ihlar > > wrote: >=20 >=20 > Hi IPPM, >=20 >=20 >=20 > This email starts an adoption call for = draft-cpaasch-ippm-responsiveness, > "Responsiveness under Working Conditions=E2=80=9D. This document = specifies the =E2=80=9CRPM > Test=E2=80=9D for measuring user experience when the network is fully = loaded. The > intended status of the document is Experimental. >=20 >=20 >=20 >=20 > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft- = > cpaasch-ippm-responsiveness/__;!!BhdT!yrleDfru-45Lar4Qe5- > 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU3zpKI3$ >=20 >=20 > = https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft- = > cpaasch-ippm-responsiveness-01__;!!BhdT!yrleDfru-45Lar4Qe5- > 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPf9N-E8h$ >=20 >=20 >=20 >=20 > This adoption call will last until Monday, December 20. Please review = the > document, and reply to this email thread to indicate if you think IPPM = should > adopt this document. >=20 >=20 >=20 >=20 > BR, >=20 > Marcus >=20 >=20 >=20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = > T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ >=20 >=20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = > T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ >=20 > =20 >=20 > =20 >=20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = > T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ >=20 >=20 >=20 > -- > I tried to build a better future, a few times: > = https://urldefense.com/v3/__https://wayforward.archive.org/?site=3Dhttps*3= A*2F*2 = > Fwww.icei.org__;JSUl!!BhdT!yrleDfru-45Lar4Qe5- > 4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPXLNE64R$ >=20 > Dave T=C3=A4ht CEO, TekLibre, LLC >=20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > = https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;!= !Bhd = > T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$ > =20 --Apple-Mail=_A267F392-12F3-41E8-8758-E36CC38B3A66 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hello= Al,

          please see = inline:

          On Feb 20, 2022, at 9:37 AM, MORTON JR., AL = <acmorton@att.com> wrote:

          Hi Christoph,
          Thanks for = continuing this discussion. Allow me to reply and add my view below,
          Al
           
          From: Christoph Paasch <cpaasch@apple.com> 
          Sent: Thursday, February 17, 2022 = 7:24 PM
          To: MORTON JR., AL <acmorton@att.com>
          Cc: Dave Taht <dave.taht@gmail.com>; = Marcus Ihlar <marcus.ihlar@ericsson.com>; IETF IPPM WG <ippm@ietf.org>
          Subject: Re: [ippm] Adoption call = for draft-cpaasch-ippm-responsiveness
           
          Hello = Al,


          On Feb 16, 2022, at = 8:07 AM, MORTON JR., AL <acmorton@att.com> wrote:
           
          Hi Christoph,

          you wrote:

          I think what would be = helpful would be a section in the draft that explains the different = sources of latency (network, server, client) and how they affect the = final RPM-number and how one can separate out these two components. It = is also important to understand that the results are highly = implementation-dependent. And explaining that in this section should = help, I believe.


          when you say, "...the = results are highly implementation-dependent.", 
          which = implementations are you referring to:

          Network= path? Server? Client? "Working Load" conditions? 
           
          Network path, Server and = Client. Because the layer at which things are being measured is right = above the HTTP layer. Thus, implementation-details all the way from the = PHY up to HTTP matter and can influence the results.

          All of the above?

          Network implementation should influence the results, the = others not so much (with a standardized metric, we should have = equivalent results across implementations, at least that's what we said = in RFC6576/BCP176). And it can be rather difficult to separate the (I = count at least 4) results-influencing factors.
           
          I think it is impossible to = only have network implementation influence the results. For example, if = UDP is used to measure latency the entire UDP-stack, IP-stack,... of the = sender and receiver will influence the results.
          [acm]
          Agreed, although the one-to-one correspondence of = packets on the wire and UDP datagrams is an advantage with UDP = measurements. Many measurement systems use UDP today, and it has been = straightforward to calibrate the delay introduced by the host stack and = remove that component when necessary (within a tolerance of variation = appropriate for network measurements, it may be nearly = deterministic).
           
          In some way, sender and receive = UDP/IP/Driver/... stack is part of the "network implementation" = here.
          [acm]
          We have performed the calibrations of the stack = so that we can continue to use the notion of =E2=80=9Cwire-time=E2=80=9D = (that separate stack from network).
           
          For the responsiveness = it is exactly the same. We use HTTP/2, and thus this is part of the = "network implementation".
          [acm]
          I would like to see more on this, because:
          I haven=E2=80=99t measured or attempted to = calibrate delays this high in the stack myself. But I suspect there may = be less determinism and more host processing time/variation compared to = UDP delay measurements. This is one place that new forms of = implementation dependence might creep-in, in addition to the aspect of = Working-Load generation (another possible implementation-dependency = mentioned = above).

          The methodology does allow to some extend = factor out network-latency from end-host latency by sending probes on = load-generating and separate connections. So, that should allow to = calibrate things to some extend.

          Now, = with these discussion I am wondering about one thing:

          Why would one want to calibrate out the end-host = latency from the measurement? Sure, when trying to debug things to = identify the sources of bufferbloat. But for debugging the method = described in the draft is a very poor tool. When I'm debugging = bufferbloat, I resort back to traceroute, tcptraceroute, ping, iperf, = curl,...

          So, I don't fully = understand why one would want to calibrate the end-host latency away = from the measurement. Because, at the end that is what the end-users are = experiencing and so I want to measure it entirely end-to-end. = Responsiveness really is a metric that is focused on the end-user and = not the network in isolation.


          Christoph


           
           
          Does that make sense?
           
           
          Thanks,
          Christoph



          more stuff = to consider,
          Al



          -----Original Message-----
          From: ippm <ippm-bounces@ietf.org> On = Behalf Of Dave Taht
          Sent: Tuesday, February 15, 2022 8:00 = PM
          To: Christoph Paasch <cpaasch=3D40apple.com@dmarc.ietf.org>
          Cc: = Marcus Ihlar <marcus.ihlar=3D40ericsson.com@dmarc.ietf.org>; IETF = IPPM WG
          <ippm@ietf.org>
          Subject: Re: [ippm] Adoption call for = draft-cpaasch-ippm-responsiveness

          On Tue, = Feb 15, 2022 at 4:11 PM Christoph Paasch
          <cpaasch=3D40apple.com@dmarc.ietf.org> wrote:


          Hello Greg,

          On Feb 8, 2022, at 1:10 PM, Greg Mirsky <gregimirsky@gmail.com> = wrote:

          Hi Christoph,
          apologies = for the belated response and thank you for sharing interesting
          details of you using the measurement method. I think that if = the measurement
          method can not only provide the Round-trip = Per Minute (RPM) metric but expose
          the network propagation = and residential components of the round-trip delay,
          then = it seems to me, the scope of the draft to be aligned with the charter = of
          the IPPM WG and I'll be in favor of the WG adoption of = the work.

          What do you think? What is the opinion of the authors and the = WG?


          I am assuming that with = "residential components" you mean the server/client-
          side contribution to the measured latency, right?


          In that case, yes the = method does allow to separate these, as latency-probes
          are sent on both the load-generating connections and on = separate connections.
          The difference between the two = represents the "server-side contribution" to
          the = latency.

          I remember vividly how "neat" it = seemed that QUIC had adopted the idea
          of an inband "ping" = in version Q018 in 2012 (or so).

          https://urldefense.com/v3/__https://docs.google.com/document/d/= 1WJvyZflAO2pq77
          yOLbp9NsGjC1CHetAXV8I0fQe-B_U/edit__;!!BhdT!yrleDfru-45Lar4Qe5-=
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPeUiZuj5$
          Q018: Added a PING frame

          What I = don't remember or understand at the moment is I'm under the
          impression that's in the SSL layer as of http2.0? There a = good ref?





          I think what would be = helpful would be a section in the draft that explains
          the different sources of latency (network, server, client) = and how they affect
          the final RPM-number and how one can = separate out these two components. It is
          also important to = understand that the results are highly implementation-
          dependent. And explaining that in this section should help, I = believe.


          Would that be in line with what you are = looking for?


          Thanks,
          Christoph



          Regards,
          Greg

          On = Thu, Jan 6, 2022 at 4:42 PM Christoph Paasch <cpaasch@apple.com> = wrote:


          Hello Greg,

          On = Jan 6, 2022, at 3:00 PM, Greg Mirsky <gregimirsky@gmail.com> = wrote:

          Hi Christoph,
          a happy = and healthy New Year to you and All!


          Happy New Year to you as well!

          Thank you for your kind consideration of my notes and = detailed responses.
          Please find my follow-up notes in-line = below under the GIM>> tag.



          Thanks for your replies. Please = see inline:

          On Wed, Jan 5, 2022 at 10:52 AM = Christoph Paasch <cpaasch@apple.com> = wrote:


          Hello Greg,

          thanks = for your comments. Please see inline:

          On = Dec 22, 2021, at 11:43 PM, Greg Mirsky <gregimirsky@gmail.com> = wrote:

          Dear Marcus, Authors, et al,
          apologies for the belated response.
          I've read = the draft and have some comments to share with you:

          as I understand it, the proposed new responsiveness metric is = viewed as
          the single indicator of a bufferbloat = condition in a network. As I recall, the
          discussion at = Measuring Network Quality for End-Users workshop and on the
          mailing list indicated, that there=E2=80=99s no consensus on = what behaviors, symptoms
          can reliably signal the = bufferbloat.


          We are not trying for this responsiveness = metric to be "the single
          indicator of bufferbloat". Bufferbloat = can be measured in many different
          number of ways. And each = of these will produce a correct, but a different
          result. = Thus, "bufferbloat" is whatever the methodology tries to detect.


          Let me give an example = of two methodologies that are both correct but both
          will produce entirely different = numbers :


          If we would decide to generate the load by = flooding the network with UDP
          traffic from a specific 4-tuple and = measure latency with parallel ICMP pings.
          Then, on a = over-buffered FIFO queue we would measure huge latencies (thus
          correctly expose bufferbloat), while on a FQ-codel queue we = would not measure
          any bufferbloat.


          If on the other hand, = the load-generating traffic is changing the source-
          port for every single UDP-packet, then = in both the FIFO-queue and the FQ-codel
          queue we will = measure huge amounts of bufferbloat.


          Thus, these two methods both produced correct = results but with hugely
          different numbers in the FQ-codel = case. [1]


          Now, while both methods measure some variant = of bufferbloat, they both
          don't measure a realistic usage of the = network.


          GIM>> Thank you for the insights. It = seems to me that what the method can
          demonstrate is rather the level of = efficiency of the AQM in the network for a
          particular = class of applications.



          Yes, that is a good = description. It is for a "particular class of
          applications" and we are trying to = make this class of applications
          representative of a = "typical user-scenario". (admittedly, we can debate
          forever = on what kind of applications are representative and I would love to
          have that debate :-)).


          On the point of "efficiency of the AQM". I = would go even further that it's
          not only AQM but also the client- and = server-side implementations of these
          applications (as = noted further below).






          That is why the "Responsiveness = under working conditions" tries to clearly
          specify how the load is generated and = how the latency is being measured. And
          it does not measure = "bufferbloat" but it measures "responsiveness under
          working = conditions" based on the methodology that is being used (using HTTP/2
          or HTTP/3, multiple flows, ...). It does expose bufferbloat = which can happen
          in the network. It also exposes certain = server-side behaviors that can cause
          (huge amounts of) = additional latency - those behaviors are typically not
          called "bufferbloat".


          GIM>> Thank you for pointing out that = the result of the RTT measurement has
          two contributing factors - network and = server.



          Yes, servers contribute as do = the client-side implementations. It's all
          three (client, network, server) that = need to work "correctly" to achieve good
          responsiveness. = Btw., as we are now gathering more experience with our
          methodology in different environments we find that the = biggest portions of
          latency actually come from the = server-side. We see several seconds of latency
          introduced = by the HTTP/2 and TCP implementations.


          It seems worth enhancing the method to = localize each contribution and
          measure them separately.



          With the = latency measuring probes being sent on load-bearing connections
          and separate connections and with the = separate connections serving to measure
          DNS/TCP/... = individually, the different data-points actually allow to localize
          to some extend.


          However, I would be reluctant to dive too deep = into localization/trouble-
          shooting/debugging of networks as part = of this I-D. As this opens a whole new
          can of worms. We = could then start thinking about sending latency-probes while
          playing with the IP TTL to find which router is introducing = the latency,...
          It's an entirely different research-topic = IMO :-) Dave Taht was thinking of
          starting something along = these lines
          (https://urldefense.com/v3/__https://github.com/dtaht/wtbb__;!!B= hdT!yrleDfru-
          45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPRghwEjg$ ).



          It seems that it would be reasonable to first define what is = being
          measured, characterized by the = responsiveness metric. Having a document that
          discusses = and defines the bufferbloat would be great.


          I agree that there is a = lack of definition for what "bufferbloat" really
          is.


          The way we look at "responsiveness under = working conditions" is that it
          measures the latency in conditions = that may realistically happen in worst-case
          scenarios with = end-users/implementations that are non-malicious (non-malicious
          to exclude the UDP-flooding scenario).


          Thus, I assume we = should make a better job at explaining this. The lack of
          a formal definition of "bufferbloat" = doesn't help and thus we are indeed using
          this term a bit = freely in the current draft. We will improve the Introduction
          to better set the stage
          (https://urldefense.com/v3/__https://github.com/network-quality/= draft-cpaasch-
          ippm-responsiveness/issues/31__;!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU0pYBOv$ ).

          It seems like in the = foundation of the methodology described in the draft
          lies the assumption that without = adding new flows the available bandwidth is
          constant, does = not change. While that is mostly the case, there are
          technologies that behave differently and may change bandwidth = because of the
          outside conditions. Some of these behaviors = of links with variable discrete
          bandwidth are discussed = in, for example, RFC 8330 and RFC 8625.


          I'm not sure I entirely understand your = comment. But let me explain why we
          are gradually adding new flows:


          1. TCP-implementations = have usually a fixed limit for the upper bound of
          the receive window. In some networks = that upper bound is lower than the BDP of
          the network. = Thus, the only way to reach full capacity is by having multiple
          flows.

          2. Having multiple connections allows to quicker achieve full = capacity in
          high-RTT networks and thus speeds up = the test-duration.

          3. In some networks with "random" packet-loss, = congestion-control may come
          in the way of achieving full capacity. = Again, multiple flows will work around
          that.


          GIM>> I might = have asked several questions at once. Let me clarify what I
          am looking for:


          As I understand the = method of creating the "working conditions in a
          network" is based on certain = assumptions. First, seems is that the bandwidth
          is = symmetrical between the measurement points. Second, that the = bandwidth
          doesn't change for the duration of the = measurement session. AFAIK, in the
          access networks, both = are not necessarily always the case.


          We don't have the assumption that bandwidth is = symmetrical (assuming, you
          mean uplink/downlink symmetry - please = clarify otherwise).


          The load-generating algorithm runs = independently for uplink and downlink
          traffic. And it is perfectly fine when = both have huge asymmetry.



          Regarding the stability of the = bandwidth:
          You are making a good point indeed that we = assume that the bandwidth is to
          some extend stable while ramping up = the flows to "working conditions".
          Admittedly that = assumption does not always hold, and that is one of the
          reasons why we try hard for the test to not take too long.

          I'm not sure how we could adjust the = algorithm for varying bandwidth
          without introducing too much = complexity. I'm open for suggestions :-)


          On the other hand, I might have missed how the = method of creating the
          "working conditions" guarantees a = symmetrical load between the measurement
          points.


          As mentioned above, we = don't assume a symmetrical load. Can you show us
          where in the draft we give that = impression, so we can fix that?




          Then, I find the motivation not to use time = units to express the
          responsiveness metric not = convincing:


            "Latency" is a poor measure of = responsiveness, since it can be hard
            for the = general public to understand.  The units are unfamiliar
            ("what is a millisecond?") and counterintuitive = ("100 msec - that
            sounds good - it's only a = tenth of a second!").


          Can = you expand on what exactly is not convincing to you? Do you think = that
          people will mis-understand the metric = or that milli-seconds is the right way
          to communicate = responsiveness to the general public?


          GIM>> Let me try. We know packet delay = requirements for AR, VR
          applications. I believe that gamers = are familiar with these numbers too. The
          same is likely = the case for the industrial automation use cases served, for
          example, by Deterministic Networking.



          I can = understand that for a technical audience, milli-seconds is easy and
          familiar. A non-technical audience = might be more open to accepting a new
          "higher-is-better" = metric. Responsiveness is something new and abstract so,
          it's kind of natural that it comes with a new unit.


          But I fully recognize = that that's a controversial topic and can be
          discussed at length :)


          Cheers,Christoph




          Thanks a lot,
          Christoph

          [1] And there are many = networks that prioritize ICMP pings, thus we could
          observe even more different results = based on what protocol is used to measure
          the latency.



          On Mon, = Dec 6, 2021 at 7:53 AM Marcus Ihlar
          <marcus.ihlar=3D40ericsson.com@dmarc.ietf.org> = wrote:


          Hi IPPM,



          This email starts an adoption call for = draft-cpaasch-ippm-responsiveness,
          "Responsiveness under = Working Conditions=E2=80=9D. This document specifies the =E2=80=9CRPM
          Test=E2=80=9D for measuring user experience when the network = is fully loaded. The
          intended status of the document is = Experimental.




          https://urldefense.com/v3/__https://datatracker.ietf.org/doc/dr= aft-
          cpaasch-ippm-responsiveness/__;!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPU3zpKI3$


          https://urldefense.com/v3/__https://datatracker.ietf.org/doc/ht= ml/draft-
          cpaasch-ippm-responsiveness-01__;!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPf9N-E8h$




          This adoption call will last until Monday, December 20. = Please review the
          document, and reply to = this email thread to indicate if you think IPPM should
          adopt= this document.




          BR,

          Marcus



          _______________________________________________
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          https://urldefense.com/v3/__https://www.ietf.org/mailman/listin= fo/ippm__;!!Bhd
          T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$=

           

           


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          T!yrleDfru-45Lar4Qe5-4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPTFWzNHi$=



          --
          I tried to build a better future, a few times:
          https://urldefense.com/v3/__https://wayforward.archive.org/?sit= e=3Dhttps*3A*2F*2
          Fwww.icei.org__;JSUl!!BhdT!yrleDfru-45Lar4Qe5-
          4bWSRTYtJSdvp8oh643W10p69kHM1mzsvPXLNE64R$

          Dave T=C3=A4ht CEO, TekLibre, LLC

          _______________________________________________
          ippm mailing list
          ippm@ietf.org
          https://urldefense.com/v3/__https://www.ietf.org/mailman/listin= fo/ippm__;!!Bhd
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boundary="_000_AM0PR07MB413110ADEB9743F426CE8EABE23D9AM0PR07MB4131eurp_" MIME-Version: 1.0 X-OriginatorOrg: ericsson.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM0PR07MB4131.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 17eaaafa-0ab0-46fd-1af1-08d9f7a75b8b X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Feb 2022 15:07:21.6609 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: JsBIrBsGzyfQcscuI//3+uMHcDvYkKSt0kJTGx92VjnHhH+EiVuQS+d+4otdXVu9aMGwNvlHN0BZU+r4GCajpHNstRFFBrHugCCWXoXpMjw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR07MB3202 Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Feb 2022 15:08:12 -0000 --_000_AM0PR07MB413110ADEB9743F426CE8EABE23D9AM0PR07MB4131eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, We've seen good discussion and good support for taking on this work. Thanks= to everyone who has contributed. Several concerns have been raised around how to separate the various compo= nents that contribute to the latency metric. Based on this we would declare that there is working group consensus for ad= opting this document and that the working group must focus on describing th= e various sources of latency involved in this metric and how those latency = components can be separated. This email ends the adoption call. BR Marcus From: ippm On Behalf Of Marcus Ihlar Sent: den 6 december 2021 16:53 To: ippm@ietf.org Subject: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness Hi IPPM, This email starts an adoption call for draft-cpaasch-ippm-responsiveness, "= Responsiveness under Working Conditions". This document specifies the "RPM = Test" for measuring user experience when the network is fully loaded. The i= ntended status of the document is Experimental. https://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/ https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-responsiveness-01 This adoption call will last until Monday, December 20. Please review the d= ocument, and reply to this email thread to indicate if you think IPPM shoul= d adopt this document. BR, Marcus --_000_AM0PR07MB413110ADEB9743F426CE8EABE23D9AM0PR07MB4131eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

          Hi,

          We’ve seen good discussion and good support fo= r taking on this work. Thanks to everyone who has contributed.

          Several concerns have been raised around how to sepa= rate  the various components that contribute to the latency metric.

          Based on this we would declare that there is working= group consensus for adopting this document and that the working group must= focus on describing the various sources of latency involved in this metric= and how those latency components can be separated.

           

          This email ends the adoption call.

           

          BR

          Marcus

           

           

           

           

          From: ippm <ippm-bounces@ietf.org> O= n Behalf Of Marcus Ihlar
          Sent: den 6 december 2021 16:53
          To: ippm@ietf.org
          Subject: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness<= o:p>

           

          Hi IPPM= ,

          &n= bsp;

          This em= ail starts an adoption call for draft-cpaasch-ippm-responsiveness, "Re= sponsiveness under Working Conditions”. This document specifies the &= #8220;RPM Test” for measuring user experience when the network is fully loaded. The intended status of the document is Experiment= al.   

          &n= bsp;

          ht= tps://datatracker.ietf.org/doc/draft-cpaasch-ippm-responsiveness/<= /o:p>

          https://datatracker.ietf.org/doc/html/draft-cpaasch-ippm-responsivenes= s-01

          &n= bsp;

          This ad= option call will last until Monday, December 20. Please review the document, and reply to this e= mail thread to indicate if you think IPPM should adopt this document.<= /o:p>

          &n= bsp;

          BR,

          Marcus =

           

          --_000_AM0PR07MB413110ADEB9743F426CE8EABE23D9AM0PR07MB4131eurp_-- From nobody Fri Feb 25 11:13:31 2022 Return-Path: X-Original-To: ippm@ietf.org Delivered-To: ippm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 125C23A1355; Fri, 25 Feb 2022 11:13:27 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: ippm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.46.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: ippm@ietf.org Message-ID: <164581640698.23900.415085170129049931@ietfa.amsl.com> Date: Fri, 25 Feb 2022 11:13:27 -0800 Archived-At: Subject: [ippm] I-D Action: draft-ietf-ippm-capacity-protocol-01.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Feb 2022 19:13:28 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the IP Performance Measurement WG of the IETF. Title : Test Protocol for One-way IP Capacity Measurement Authors : Len Ciavattone Al Morton Filename : draft-ietf-ippm-capacity-protocol-01.txt Pages : 32 Date : 2022-02-25 Abstract: This memo addresses the problem of protocol support for measuring Network Capacity metrics in RFC 9097, where the method deploys a feedback channel from the receiver to control the sender's transmission rate in near-real-time. This memo defines a simple protocol to perform the RFC 9097 (and other) measurements. See Section 10: The authors seek feedback to determine what additional features will be necessary for an IETF Standards Track Protocol, beyond what is present in the running code available now. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ippm-capacity-protocol/ There is also an htmlized version available at: https://datatracker.ietf.org/doc/html/draft-ietf-ippm-capacity-protocol-01 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-capacity-protocol-01 Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts From nobody Fri Feb 25 11:51:01 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C60B83A1395 for ; Fri, 25 Feb 2022 11:50:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.896 X-Spam-Level: X-Spam-Status: No, score=-1.896 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=att.onmicrosoft.com 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 a5RPkZzqu02m for ; Fri, 25 Feb 2022 11:50:53 -0800 (PST) Received: from mx0a-00191d01.pphosted.com (mx0a-00191d01.pphosted.com [67.231.149.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 951F23A138F for ; Fri, 25 Feb 2022 11:50:53 -0800 (PST) Received: from pps.filterd (m0288873.ppops.net [127.0.0.1]) by m0288873.ppops.net-00191d01. 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CH0PR02MB7980.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6abbc678-ba47-497f-5bb2-08d9f8981c91 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Feb 2022 19:50:44.6704 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: e741d71c-c6b6-47b0-803c-0f3b32b07556 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: msZqouqmEJID9xGAG4vHEuXvfvOBkDLgK1x76ahnjWd4PfTswf7IMtYHVatN+XQr X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR0201MB3527 X-OriginatorOrg: att.com X-TM-SNTS-SMTP: C16C9E90E22053C5D90183FEE19EF901C2A4DB05AD53C05A3B87977567AC3C4E2 X-Proofpoint-ORIG-GUID: ZyWrF1vzBtBBVAbvy7aF3IUB7L9g5UAg X-Proofpoint-GUID: ZyWrF1vzBtBBVAbvy7aF3IUB7L9g5UAg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-02-25_10,2022-02-25_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_policy_notspam policy=outbound_policy score=0 bulkscore=0 clxscore=1015 mlxscore=0 suspectscore=0 adultscore=0 mlxlogscore=999 impostorscore=0 phishscore=0 malwarescore=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202250110 Archived-At: Subject: Re: [ippm] I-D Action: draft-ietf-ippm-capacity-protocol-01.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Feb 2022 19:50:59 -0000 Hi IPPM, The authors have implemented/proposed some user-requested features in this = update of the draft, including: + Implementation of Randomized payload option. Performance suggests very li= mited compressibility. + Server can set a BW limit for mission-control; Client would supply a max = BW for its specific testing to help the server manage tests within its limi= t. + Optional Start rate for load-adjustment algorithm (fixed-rate option rema= ins). + Backward compatibility: Servers can test with both protocol version 8 and= version 9. Delay and delay variation measurements during Capacity tests remain one of = the protocol's strengths (loss too). One way to evaluate the protocol is to try-out the running code [0]. We hope you'll make some time for review and comments leading-up to IETF-11= 3. Al and Len [0] https://github.com/BroadbandForum/obudpst > -----Original Message----- > From: ippm On Behalf Of internet-drafts@ietf.org > Sent: Friday, February 25, 2022 2:13 PM > To: i-d-announce@ietf.org > Cc: ippm@ietf.org > Subject: [ippm] I-D Action: draft-ietf-ippm-capacity-protocol-01.txt >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the IP Performance Measurement WG of the IET= F. >=20 > Title : Test Protocol for One-way IP Capacity Measureme= nt > Authors : Len Ciavattone > Al Morton > Filename : draft-ietf-ippm-capacity-protocol-01.txt > Pages : 32 > Date : 2022-02-25 >=20 > Abstract: > This memo addresses the problem of protocol support for measuring > Network Capacity metrics in RFC 9097, where the method deploys a > feedback channel from the receiver to control the sender's > transmission rate in near-real-time. This memo defines a simple > protocol to perform the RFC 9097 (and other) measurements. >=20 > See Section 10: The authors seek feedback to determine what > additional features will be necessary for an IETF Standards Track > Protocol, beyond what is present in the running code available now. >=20 >=20 > The IETF datatracker status page for this draft is: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-i= ppm- > capacity-protocol/__;!!BhdT!hU7TX2- > _MzrINiXgiMqcLWAvfe12cv2YVrKPpG8DWj_GZpVwifCpy7rCx28NK1EqCsK_Bk3Gu0hrpj77= _BSPk > A$ >=20 > There is also an htmlized version available at: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-i= etf- > ippm-capacity-protocol-01__;!!BhdT!hU7TX2- > _MzrINiXgiMqcLWAvfe12cv2YVrKPpG8DWj_GZpVwifCpy7rCx28NK1EqCsK_Bk3Gu0hrpj6L= _rj1f > w$ >=20 > A diff from the previous version is available at: > https://urldefense.com/v3/__https://www.ietf.org/rfcdiff?url2=3Ddraft-iet= f-ippm- > capacity-protocol-01__;!!BhdT!hU7TX2- > _MzrINiXgiMqcLWAvfe12cv2YVrKPpG8DWj_GZpVwifCpy7rCx28NK1EqCsK_Bk3Gu0hrpj6k= s1pSK > A$ >=20 >=20 > Internet-Drafts are also available by rsync at rsync.ietf.org::internet-d= rafts >=20 >=20 > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/ippm__;= !!Bhd > T!hU7TX2- > _MzrINiXgiMqcLWAvfe12cv2YVrKPpG8DWj_GZpVwifCpy7rCx28NK1EqCsK_Bk3Gu0hrpj4g= 5dGdH > Q$ From nobody Fri Feb 25 17:32:55 2022 Return-Path: X-Original-To: ippm@ietf.org Delivered-To: ippm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id D88343A0E0B; Fri, 25 Feb 2022 17:29:01 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "\"IETF Secretariat\"" To: , Cc: ippm@ietf.org, martin.h.duke@gmail.com X-Test-IDTracker: no X-IETF-IDTracker: 7.46.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <164583894186.24617.10634340566916412015@ietfa.amsl.com> Date: Fri, 25 Feb 2022 17:29:01 -0800 Archived-At: Subject: [ippm] ippm - Requested session has been scheduled for IETF 113 X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 Feb 2022 01:29:02 -0000 Dear Tommy Pauly, The session(s) that you have requested have been scheduled. Below is the scheduled session information followed by the original request. ippm Session 1 (2:00 requested) Monday, 21 March 2022, Morning Session I 1000-1200 Room Name: Park Suite 3 size: 145 --------------------------------------------- iCalendar: https://datatracker.ietf.org/meeting/113/sessions/ippm.ics Request Information: --------------------------------------------------------- Working Group Name: IP Performance Measurement Area Name: Transport Area Session Requester: Tommy Pauly Number of Sessions: 1 Length of Session(s): Number of Attendees: 40 Conflicts to Avoid: People who must be present: Alfred Channon Morton Frank Brockners Greg Mirsky Marcus Ihlar Martin Duke Tommy Pauly Resources Requested: Special Requests: --------------------------------------------------------- From nobody Sun Feb 27 11:59:18 2022 Return-Path: X-Original-To: ippm@ietfa.amsl.com Delivered-To: ippm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A8F0B3A0C1B for ; Sun, 27 Feb 2022 11:59:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.906 X-Spam-Level: X-Spam-Status: No, score=-1.906 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=att.onmicrosoft.com 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 X0WcMLYGoaKl for ; Sun, 27 Feb 2022 11:59:10 -0800 (PST) Received: from mx0b-00191d01.pphosted.com (mx0b-00191d01.pphosted.com [67.231.157.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2A6FE3A0C10 for ; Sun, 27 Feb 2022 11:59:10 -0800 (PST) Received: from pps.filterd (m0288867.ppops.net [127.0.0.1]) by m0288867.ppops.net-00191d01. 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DD7C345AF660C051AC0F852F90AA3C2C2CA4BA1E99BC21BCB4AEAB6F1AD46A5F2 X-Proofpoint-ORIG-GUID: GzlQ8OQOWuTF9H61AcyMi0lclG3x-NDr X-Proofpoint-GUID: GzlQ8OQOWuTF9H61AcyMi0lclG3x-NDr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-02-27_09,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_policy_notspam policy=outbound_policy score=0 priorityscore=1501 mlxlogscore=999 bulkscore=0 spamscore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 mlxscore=0 malwarescore=0 suspectscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202270137 Archived-At: Subject: Re: [ippm] Adoption call for draft-cpaasch-ippm-responsiveness X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K6c822sHFz67wrC; Mon, 28 Feb 2022 18:29:54 +0800 (CST) Received: from fraeml714-chm.china.huawei.com (10.206.15.33) by fraeml710-chm.china.huawei.com (10.206.15.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 28 Feb 2022 11:30:56 +0100 Received: from fraeml714-chm.china.huawei.com ([10.206.15.33]) by fraeml714-chm.china.huawei.com ([10.206.15.33]) with mapi id 15.01.2308.021; Mon, 28 Feb 2022 11:30:56 +0100 From: Giuseppe Fioccola To: "adrian@olddog.co.uk" , "draft-zhou-ippm-enhanced-alternate-marking@ietf.org" CC: 'IETF IPPM WG' Thread-Topic: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Thread-Index: AdgfTqHA04mXeuu6RYeNAqWhYI87IgCNetXwAAon5oACuCyckA== Date: Mon, 28 Feb 2022 10:30:56 +0000 Message-ID: <33cc90341243464ca5c495abeb90aec2@huawei.com> References: <013e01d81f4e$c9f49870$5dddc950$@olddog.co.uk> <034a01d821b5$8fe16460$afa42d20$@olddog.co.uk> In-Reply-To: <034a01d821b5$8fe16460$afa42d20$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.48.199.215] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [ippm] A review of draft-zhou-ippm-enhanced-alternate-marking-08 X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Feb 2022 10:31:05 -0000 Dear Adrian, All, Please note that we just submitted a new version of the draft to address yo= ur comments. Feedback and comments are always welcome. Regards, Giuseppe -----Original Message----- From: Adrian Farrel =20 Sent: Monday, February 14, 2022 4:14 PM To: Giuseppe Fioccola ; draft-zhou-ippm-enhan= ced-alternate-marking@ietf.org Cc: 'IETF IPPM WG' Subject: RE: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Thanks Giuseppe, All looks good. Adrian -----Original Message----- From: Giuseppe Fioccola Sent: 14 February 2022 15:01 To: adrian@olddog.co.uk; draft-zhou-ippm-enhanced-alternate-marking@ietf.or= g Cc: 'IETF IPPM WG' Subject: RE: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Hi Adrian, Thanks a lot for your thorough revision.=20 It will help to improve the document and we plan to publish the new revisio= n soon. Please find my responses inline as [GF]. Best Regards, Giuseppe -----Original Message----- From: Adrian Farrel Sent: Friday, February 11, 2022 2:54 PM To: draft-zhou-ippm-enhanced-alternate-marking@ietf.org Cc: 'IETF IPPM WG' Subject: A review of draft-zhou-ippm-enhanced-alternate-marking-08 Hi, I've just been looking at draft-ietf-6man-ipv6-alt-mark, so I thought I wou= ld also have a look at this draft. Here are a few comments that the authors may find helpful. Best, Adrian =3D=3D=3D Abstract 1. Don't use references in the Abstract 2. It would be really nice to say which enhanced capabilities and functions are provided and allowed. 3. s/the enhanced/enhanced/ [GF]: Sure, I will apply these changes and specify what are the enhanced ca= pabilities, for example thicker packet loss measurements and more dense del= ay measurements with no limitation for the number of concurrent flows under= monitoring --- Requirements language 1. You should move this down into section 1.1 2. You need to use the up-to-= date boilerplate [GF]: Yes, we will do. --- Section 1 1. s/an hybrid/a hybrid/ 2. s/IPv6 AltMark Option/The IPv6 AltMark Option/ 3. s/to the IPv6 protocol= /to IPv6/ 4. s/defines Extension/defines an Extension/ 5. s/encode Alternat= e/encode the Alternate/ 6. s/both Hop-by-Hop/both the Hop-by-Hop/ 7. s/and Destination/and the Destination/ 8. s/carried as SRH TLV/carried as a= TLV in the Segment Routing Header/ [GF]: We will include these changes. 9. You have... While the AltMark Option implements the basic alternate marking method, this document defines the extended data fields for the AltMark Option and provides the enhanced capabilities. ...I'm not clear, but I think, s/the extended/extended/ and s/the enhanced/enhanced/ But I think that the Introduction (in more detail than the Abstract)=20 needs to give clues about those capabilities. [GF]: We will apply the suggested changes. I agree that more detailed infor= mation about the enhanced capabilities can be included in the Introduction. --- Section 2 1. s/the next figure/Figure 1/ 2. s/An 8 bits/An 8-bit/ [GF]: We will include these changes. 3. It is not clear from the text that two bits of the former Reserved field remain reserved, are shown as R in the figure, and MUST continue to be set to zero on transmission and ignored on receipt. [GF]: We will clarify this point. 4. s/Fig. 1:/Figure 1:/ (same for all the figures) [GF]: Yes. 5. Figure 1 is slightly confusing as Section 3.1 of draft-ietf-6man-ipv6 -alt-mark shows two additional fields (Option Type and Opt Data Len) 8. Do you really need 8 bits for the NextHeader field. You have reserved=20 0-8 for special purposes, and used just one other value (9). At the=20 same time you have removed 8 out of the 10 bits available for future extensions. Furthermore, 8 values looks like a lot of experimentation space. Why not... - Keep zero as reserved (for backward compatibility - by the way, you=20 should say in the text why zero is reserved) - Reduce experimentation to the values 1, 2, 3 - Assign just 4 bits for "NextHeader" [GF]: This is a good suggestion. It looks reasonable to reduce the number o= f bits for NextHeader. 7. I really feel that you are going to need a registry for the values of the NextHeader field. 8. s/The following figure/Figure 2/ [GF]: We will include these changes. 9. You have ... o Flag - A 4 bits flag to indicate the special purpose usage. ...It's OK, but could you add "(see below)" to save me from panic. [GF]: Sure, good suggestion. 10. s/A 4 bits flag/A 4-bit flag/ 11. For Len ("It indicates the length of extension headers.") you need to say what is counted and in what units. Do you start at FlowMonID Ext or after Padding? Do you count in octets or double words? 12. s/A 16 bits Bitmap/A 16-bit bitmap/ [GF]: We will do. 13. To be clear, is the padding there specifically as padding, or is a=20 reserved field? What does "when not being used" mean? Looking later I think that you only have padding present sometimes, so it is=20 genuinely padding, but the text does not explain when it is there and when it isn't. [GF]: We can clarify that padding is a variable length field as further spe= cify later in the document. 14. s/requested to set/requested to be set/ 15. Similarly for MetaInfo, cou= ld you add "(see below)"? 16. s/The Flag is defined as/The Flag is defined in Figure 3 as/ 17. OLD others - Reserved. NEW others (shown as R) - Reserved. MUST be set to zero and ignored on receipt. END 18. s/as a bit map as follows:/in Figure 4 as a bit map as follows:/=20 [GF]: We will apply these changes. 19. I read "stands for the second part" several times before I realised you mean "stands of the number of seconds in the timestamp" and not "the second part of the timestamp"! [GF]: We will revise the text. 20. I see that various pieces of information are present if a particular bit in the bitmap is set. But you don't talk about whether that=20 information must be ordered according to the order of the bits (of course it must be). [GF]: Yes, we will clarify this point. 21. Figure 6 shows Control as a 6-bit field and Period as a 10-bit=20 field. If this is an error, fix the figure. If it is intentional please make it clear in the text. [GF]: We will further clarify this part. 22. How are the various fields of the control information extension=20 used? I feel you may be missing some reference pointers. 23. What is the sequence number used for? [GF]: We will add further details here. --- Section 3. In particular the fundamental security requirement is that Alternate Marking MUST be applied in a specific limited domain, as also mentioned in [RFC8799]. It's subtle, but I think you don't mean that it MUST be applied in a specif= ic limited domain. Possibly "it MUST only be applied". [GF]: Yes, we will revise this section as well. 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Mon, 28 Feb 2022 13:35:30 +0000 Date: Mon, 28 Feb 2022 13:35:29 +0000 (UTC) From: "nalini.elkins@insidethestack.com" To: IETF IPPM WG Message-ID: <1915729101.3398561.1646055329146@mail.yahoo.com> In-Reply-To: <164605429905.26093.5187205335754673000@ietfa.amsl.com> References: <164605429905.26093.5187205335754673000@ietfa.amsl.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_3398560_552743340.1646055329143" X-Mailer: WebService/1.1.19797 YMailNorrin Archived-At: Subject: [ippm] Fw: New Version Notification for draft-elkins-ippm-encrypted-pdmv2-02.txt X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Feb 2022 13:35:37 -0000 ------=_Part_3398560_552743340.1646055329143 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hello IPPM, We have posted a new version of our draft for Encrypted PDMv2.=C2=A0 =C2=A0= We have also started an implementation of a sample registration / data flow= .=C2=A0 We discuss the sample implementation in Appendix 2.=C2=A0 There will be a public side meeting in Vienna in the=C2=A0Green Room 1 - Mo= nday 8:30am - 9:30am (before the IPPM meeting).=C2=A0 =C2=A0 Here is a text representation of the relevant portion of a sample PDMv2 reg= istration packet captured via Wireshark. PDM Registration Protocol=C2=A0 =C2=A0 PDM Version: 2=C2=A0 =C2=A0 Length: = 54=C2=A0 =C2=A0 HPKE Version: 0=C2=A0 =C2=A0 Record Type: 2=C2=A0 =C2=A0 Se= quence Number: 0=C2=A0 =C2=A0 Sender Type: 1=C2=A0 =C2=A0 Authority Level: = 1=C2=A0 =C2=A0 Command: 0=C2=A0 =C2=A0 Req / Resp: 1=C2=A0 =C2=A0 Transacti= on ID: 0=C2=A0 =C2=A0 Op Code: 1=C2=A0 =C2=A0 Reserved: 0=C2=A0 =C2=A0 KEM = ID: 9008303061418796=C2=A0 =C2=A0 KDF ID: 5207154935825719688=C2=A0 =C2=A0 = KDF ID: 4716415986840602930=C2=A0 =C2=A0 Encapsulated Secret: 67a5a7395d85d= ecc2a978921d209 We will show the sample flow and show running code in the side meeting.=C2= =A0 Look forward to comments! Thanks, Nalini Elkins CEO and Founder Inside Products, Inc. www.insidethestack.com (831) 659-8360=20 ----- Forwarded Message ----- From: internet-drafts@ietf.org To: mackermann@bcbsm.com ; Adnan Rashi= d ; Ameya Deshpande ; Michael Ac= kermann ; Nalini Elkins ; Tommaso Pecorella Sent: Monday, February= 28, 2022, 05:18:26 AM PSTSubject: New Version Notification for draft-elkin= s-ippm-encrypted-pdmv2-02.txt =20 A new version of I-D, draft-elkins-ippm-encrypted-pdmv2-02.txt has been successfully submitted by Nalini Elkins and posted to the IETF repository. Name:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 draft-elkins-ippm-encrypted-pdmv= 2 Revision:=C2=A0=C2=A0=C2=A0 02 Title:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 IPv6 Performance and Diagnostic= Metrics Version 2 (PDMv2) Destination Option Document date:=C2=A0=C2=A0=C2=A0 2022-02-25 Group:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 Individual Submission Pages:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 17 URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/archive/= id/draft-elkins-ippm-encrypted-pdmv2-02.txt Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 https://datatracker.ietf.org/doc/draft-e= lkins-ippm-encrypted-pdmv2/ Htmlized:=C2=A0 =C2=A0 =C2=A0 https://datatracker.ietf.org/doc/html/draft-e= lkins-ippm-encrypted-pdmv2 Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/rfcdiff?url2= =3Ddraft-elkins-ippm-encrypted-pdmv2-02 Abstract: =C2=A0 RFC8250 describes an optional Destination Option (DO) header embedde= d =C2=A0 in each packet to provide sequence numbers and timing information as =C2=A0 a basis for measurements.=C2=A0 As this data is sent in clear- text,= this =C2=A0 may create an opportunity for malicious actors to get information fo= r =C2=A0 subsequent attacks.=C2=A0 This document defines PDMv2 which has a =C2=A0 lightweight handshake (registration procedure) and encryption to =C2=A0 secure this data.=C2=A0 Additional performance metrics which may be = of use =C2=A0 are also defined. =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=20 The IETF Secretariat =20 ------=_Part_3398560_552743340.1646055329143 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
          Hello IPPM,

          We have posted a new version of our draft for Encrypted PDMv2.  &nbs= p;We have also started an implementation of a sample registration / data fl= ow.  We discuss the sample implementation in Appendix 2. 

          There will be a public side meet= ing in Vienna in the Green Room 1 - Monday 8:30am - 9:30am (= before the IPPM meeting).   

          Here is a text represen= tation of the relevant portion of a sample PDMv2 registration packet captur= ed via Wireshark.

          PDM Regi= stration Protocol
              PDM Version: 2
            &= nbsp; Length: 54
              HPKE Version: 0
            &= nbsp; Record Type: 2
              Sequence Number: 0
          &= nbsp;   Sender Type: 1
              Authority Level: 1
              Command: 0
              Req / Resp: 1
          <= div>    Transaction ID: 0
              Op Code: 1
              Reserved: 0
              KEM ID: 90083030614= 18796
              KDF ID: 5207154935825719688
            =   KDF ID: 4716415986840602930
              Encapsulated Sec= ret: 67a5a7395d85decc2a978921d209

          We will show th= e sample flow and show running code in the side meeting.  Look forward= to comments!

          Thank= s,

          Nalini Elkins
          CEO and Founder
          Inside Products, Inc.
          www.= insidethestack.com
          (831) 659-8360


          =20
          ----- Forwarded Message -----
          From: internet-drafts@ietf.org <internet-dra= fts@ietf.org>
          To: mackermann@bcbsm.com <mackermann@b= cbsm.com>; Adnan Rashid <adnan.rashid@unifi.it>; Ameya Deshpande &= lt;ameyanrd@gmail.com>; Michael Ackermann <mackermann@bcbsm.com>; = Nalini Elkins <nalini.elkins@insidethestack.com>; Tommaso Pecorella &= lt;tommaso.pecorella@unifi.it>
          Sent: Monday, February 2= 8, 2022, 05:18:26 AM PST
          Subject: New Version Notification= for draft-elkins-ippm-encrypted-pdmv2-02.txt


          A new vers= ion of I-D, draft-elkins-ippm-encrypted-pdmv2-02.txt
          has been successfully submitted by Nalini Elkins and posted to the
          <= /div>
          IETF repository.

          =
          Name:        draft-elkins-ip= pm-encrypted-pdmv2
          Revision:    02=
          Title:        IPv6= Performance and Diagnostic Metrics Version 2 (PDMv2) Destination Option
          Document date:    2022-02-25
          Group:        Individual S= ubmission
          Pages:      &n= bsp; 17
          Diff:    &n= bsp;     https://ww= w.ietf.org/rfcdiff?url2=3Ddraft-elkins-ippm-encrypted-pdmv2-02

          Abstract:
            RFC8250 describes an optional Destination Option (DO) header = embedded
            in each packet to provide sequen= ce numbers and timing information as
            a ba= sis for measurements.  As this data is sent in clear- text, this
            may create an opportunity for malicious actors= to get information for
            subsequent attack= s.  This document defines PDMv2 which has a
          =   lightweight handshake (registration procedure) and encryption to
            secure this data.  Additional performa= nce metrics which may be of use
            are also = defined.

             =                     &nbs= p;                     &n= bsp;                     =              


          The IETF Secretariat=


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