From pcn-bounces@ietf.org Sun Jul 01 23:39:31 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5Cl8-0000Iq-MW; Sun, 01 Jul 2007 23:39:30 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I5Cl8-0000Il-9N for pcn-confirm+ok@megatron.ietf.org; Sun, 01 Jul 2007 23:39:30 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5Cl7-0000Id-VL for pcn@ietf.org; Sun, 01 Jul 2007 23:39:29 -0400 Received: from szxga02-in.huawei.com ([61.144.161.54]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I5Ckz-0004iF-LY for pcn@ietf.org; Sun, 01 Jul 2007 23:39:29 -0400 Received: from huawei.com (szxga02-in [172.24.2.6]) by szxga02-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JKJ00CWP8S377@szxga02-in.huawei.com> for pcn@ietf.org; Mon, 02 Jul 2007 11:38:27 +0800 (CST) Received: from huawei.com ([172.24.1.24]) by szxga02-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JKJ00GWF8S1DD@szxga02-in.huawei.com> for pcn@ietf.org; Mon, 02 Jul 2007 11:38:27 +0800 (CST) Received: from z24109a ([10.70.76.134]) by szxml04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JKJ00LEX8S0VX@szxml04-in.huawei.com> for pcn@ietf.org; Mon, 02 Jul 2007 11:38:25 +0800 (CST) Date: Mon, 02 Jul 2007 11:38:25 +0800 From: Tina TSOU Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt To: pcn@ietf.org, philip.eardley@bt.com Message-id: <006f01c7bc5a$724c4cb0$864c460a@china.huawei.com> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 Content-type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original Content-transfer-encoding: 7BIT X-Priority: 3 X-MSMail-priority: Normal References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.domain1.systemhost.net> X-Spam-Score: 0.0 (/) X-Scan-Signature: 453b1bfcf0292bffe4cab90ba115f503 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi all, One of the scenarios I am suggesting is below. Even in Pull mode, application layer QoS request (via RSVP) should be also sent from ingress to the centralized node, in centralized node the policy is generated, then the decision is made, and then delivers to the Ingress to enforce. I was not saying that the policy is directly generated in the Ingress. Even the rather that Push mode should be also taken into account. I.e. we define the centralized node locates in the transport control layer; the Ingress and Egress locate in transport layer. For the implementation of physical entities, they are service policy server and PCN-enabled router respectively. The centralized node is policy decision node, it should be based on (1) Egress measurement result (2) operator's policies (could be configured in the centralized node) (3) QoS request coming from the application layer (PUSH or PULL mode), to make the decision, and decide which flows should be admitted or reject, which flows should be stopped temperately or downgraded, which flows should be done policing. The generated policy should be sent to ingress for enforcement. Ingress is the policy enforcement point, it based on the policy delivered by the centralized node, (1) it allows flow pass or filter flow, (2) for the flows allowed to pass, it makes policing and coloring based on the policy. Referrence: QoS "Push" Model: model where the centralised node "pushes" traffic policies to the transport functions to enforce its policy decisions. NOTE: In this model, the CPE does not itself support native application independent QoS procedures. QoS "Pull" Model: model where, upon request from the transport processing functions, the centralised node provides traffic policies to the transport processing functions. The request from the transport processing functions may itself, for example, be triggered by path-coupled requests coming from user equipment and/or transport network elements. B. R. Tina ----- Original Message ----- From: To: Sent: Thursday, June 28, 2007 11:59 PM Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Hi all, Just a reminder that all comments on this draft would be great. It aims to describe the PCN architecture, in light of the PCN WG's Charter & its Milestone of an Info doc on 'Flow Admission and Termination Architecture within a Diffserv Domain' (due Nov 07). S1 Introduction. This is quite short. If desired, it could be boosted with a general explanation of where PCN fits into the picture of QoS and how it's evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) S2 Terminology In the "Editor's note" are 3 alternative terms that some of the authors preferred. S3 Assumptions and constraints on scope These are the 4 things mentioned in the Charter, plus some explanation of them. Are they clear? Also we mention some of the ways that a future revised Charter might look at overcoming some of the constraints/assumptions; is this sub-section at the right depth? S4 High-level functional architecture We have tried to write this section (and the following ones) so that it fits all the various proposals there've been for PCN mechanisms. Does this make the section too wishy-washy or too hard to understand? Should it include some comparison of the different mechanisms proposed (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? S5 Detailed Functional architecture Is this a reasonable description of the extra functionality that PCN requires on various nodes in the PCN-domain? Is it the right way to split up the description? For clarity / help reader's understanding, should there be some specific examples of how functionality might be distributed (eg "if you followed the deployment model in draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made at the PCN-egress-node, communicated to the PCN-ingress-nodes which makes the admission decision; etc.") S6 Design goals and challenges This briefly describes some open issues, taken from briscoe-tsvwg-cl-architecture. Are there other ones that should be mentioned? Is the problem description at the right level of depth? Should we discuss various possible solutions to these problems? S7 Deployment scenarios Briefly describes some deployment scenarios for pcn? is this at the right level of depth? S8 Operations and Management This section was written in response to the Charter saying that the architecture document should include security, manageability and operational considerations. The draft addresses this by providing some thoughts under the FCAPS headings: OAM of Faults, Configuration, Accounting, Performance and Security? Is this the right way of structuring it - does it cover the right set of topics? Is the text at the right level? - eg should it also have a detailed set of parameters that would be available for configuration? An overall question is whether the draft should have more comparison of the options (pros/cons) for various aspects. I aim to edit another version of the draft before the ietf (but maybe not before the deadline as I'm on hols next week). Thanks! Phil/ > -----Original Message----- > From: Kwok-Ho Chan [mailto:khchan@nortel.com] > Sent: 22 June 2007 04:38 > To: pcn@ietf.org > Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > Hi all: > Please see the attached E-Mail on the posting of the PCN Architecture > draft. > On behave of the editor of this draft: Phil, and the co-authors of this > draft, > we would like to request for reviews and comments of this draft and > welcome > any comments for improvements. > > Please send your comments/discussions of this draft on the PCN list. > > Thank you for your interest and review of this draft! > -- Kwok on behave of the co-authors of this draft -- > > > >To: i-d-announce@ietf.org > >Cc: > >From: Internet-Drafts@ietf.org > >Date: Thu, 21 Jun 2007 15:50:02 -0400 > >X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 > >Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt > >X-BeenThere: i-d-announce@ietf.org > >X-Mailman-Version: 2.1.5 > >Reply-To: internet-drafts@ietf.org > >List-Id: i-d-announce.ietf.org > >List-Unsubscribe: , > > > >List-Archive: > >List-Post: > >List-Help: > >List-Subscribe: , > > > >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, > > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=4 > >X-Spam-Score: 5.3 > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > ecarhea1.nortel.com > >X-DNSBL-Score: -50 > >X-DNSBL-Servers: bl.nortel.com > >X-SMTP-HELO: megatron.ietf.org > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > >X-SMTP-RCPT-TO: > >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel .c > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel .c > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c om > >X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] > >X-SMTP-REASON: PASSED > >X-SMTP-ID: 1182455563.14011407 > >X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) > >FILETIME=[BC4965C0:01C7B43D] > > > >A New Internet-Draft is available from the on-line Internet-Drafts > >directories. > > > > > > Title : Pre-Congestion Notification Architecture > > Author(s) : P. Eardley, et al. > > Filename : draft-eardley-pcn-architecture-00.txt > > Pages : 27 > > Date : 2007-6-21 > > > > The purpose of this document is to describe a general architecture > > for flow admission and termination based on aggregated (pre-) > > congestion information in order to protect the quality of service of > > established inelastic flows within a single DiffServ domain. > > > > > >A URL for this Internet-Draft is: > >http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t xt > > > >To remove yourself from the I-D Announcement list, send a message to > >i-d-announce-request@ietf.org with the word unsubscribe in the body of > >the message. > >You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce > >to change your subscription settings. > > > >Internet-Drafts are also available by anonymous FTP. Login with the > >username "anonymous" and a password of your e-mail address. After > >logging in, type "cd internet-drafts" and then > >"get draft-eardley-pcn-architecture-00.txt". > > > >A list of Internet-Drafts directories can be found in > >http://www.ietf.org/shadow.html > >or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > > >Internet-Drafts can also be obtained by e-mail. > > > >Send a message to: > > mailserv@ietf.org. > >In the body type: > > "FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt". > > > >NOTE: The mail server at ietf.org can return the document in > > MIME-encoded form by using the "mpack" utility. To use this > > feature, insert the command "ENCODING mime" before the "FILE" > > command. To decode the response(s), you will need "munpack" or > > a MIME-compliant mail reader. Different MIME-compliant mail > readers > > exhibit different behavior, especially when dealing with > > "multipart" MIME messages (i.e. documents which have been split > > up into multiple messages), so check your local documentation on > > how to manipulate these messages. > > > >Below is the data which will enable a MIME compliant mail reader > >implementation to automatically retrieve the ASCII version of the > >Internet-Draft. > > > >Content-Type: text/plain > >Content-ID: <2007-6-21120238.I-D@ietf.org> > > > >ENCODING mime > >FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt > > > > > > 00.txt> > >_______________________________________________ > >I-D-Announce mailing list > >I-D-Announce@ietf.org > >https://www1.ietf.org/mailman/listinfo/i-d-announce > > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 02 03:18:36 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5GBA-00022l-B1; Mon, 02 Jul 2007 03:18:36 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I5GB9-00022d-SU for pcn-confirm+ok@megatron.ietf.org; Mon, 02 Jul 2007 03:18:35 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5GB6-0001wp-9D for pcn@ietf.org; Mon, 02 Jul 2007 03:18:32 -0400 Received: from tcmail31.telekom.de ([217.6.95.238]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I5GB1-0005wO-E1 for pcn@ietf.org; Mon, 02 Jul 2007 03:18:32 -0400 Received: from s4de8psaans.mitte.t-com.de by tcmail31.telekom.de with ESMTP; Mon, 2 Jul 2007 08:16:47 +0200 Received: from S4DE8PSAAFQ.mitte.t-com.de ([10.151.180.5]) by s4de8psaans.mitte.t-com.de with Microsoft SMTPSVC(6.0.3790.3959); Mon, 2 Jul 2007 08:16:44 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Content-Transfer-Encoding: quoted-printable Date: Mon, 2 Jul 2007 08:16:43 +0200 Message-Id: <6439282641581441A36F7F6F83ED2ED201DB986A@S4DE8PSAAFQ.mitte.t-com.de> In-Reply-To: <006f01c7bc5a$724c4cb0$864c460a@china.huawei.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: Ace8Wp4WJYMGdAzqRhq9qlL9PFgOLAAFXd8g From: "Geib, Ruediger" To: X-OriginalArrivalTime: 02 Jul 2007 06:16:44.0266 (UTC) FILETIME=[900FC4A0:01C7BC70] X-Spam-Score: 0.0 (/) X-Scan-Signature: 79899194edc4f33a41f49410777972f8 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hello Tina, |Even in Pull mode, application layer QoS request (via RSVP)=20 |should be also sent from ingress to the centralized node, in = centralized node=20 |the policy is generated, then the decision is made, and then delivers = to the=20 |Ingress to enforce. I was not saying that the policy is directly = generated in the |Ingress. Even the rather that Push mode should be also taken=20 |into account. Do you have any specific protocol in mind for this purpose (e.g. COPS) = or=20 is your aim to look for agreement at this stage and to worry about=20 interfaces and protocols later on? Regards, Ruediger [snipped the rest, as no further comment from my side] _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 02 21:59:58 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5XgJ-0005Iy-Uf; Mon, 02 Jul 2007 21:59:55 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I5XgI-0005Ii-Jt for pcn-confirm+ok@megatron.ietf.org; Mon, 02 Jul 2007 21:59:54 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5XgI-0005IV-0n for pcn@ietf.org; Mon, 02 Jul 2007 21:59:54 -0400 Received: from szxga03-in.huawei.com ([61.144.161.55]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I5Xfa-0006Ja-BO for pcn@ietf.org; Mon, 02 Jul 2007 21:59:54 -0400 Received: from huawei.com (szxga03-in [172.24.2.9]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JKK00L3FYT244@szxga03-in.huawei.com> for pcn@ietf.org; Tue, 03 Jul 2007 09:58:14 +0800 (CST) Received: from huawei.com ([172.24.1.18]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JKK00KGMYT23M@szxga03-in.huawei.com> for pcn@ietf.org; Tue, 03 Jul 2007 09:58:14 +0800 (CST) Received: from z24109a ([10.70.76.134]) by szxml03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JKK00EQIYT1KN@szxml03-in.huawei.com> for pcn@ietf.org; Tue, 03 Jul 2007 09:58:14 +0800 (CST) Date: Tue, 03 Jul 2007 09:58:16 +0800 From: Tina TSOU Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt To: "Geib, Ruediger" Message-id: <003a01c7bd15$9f033960$864c460a@china.huawei.com> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 Content-type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original Content-transfer-encoding: 7BIT X-Priority: 3 X-MSMail-priority: Normal References: <6439282641581441A36F7F6F83ED2ED201DB986A@S4DE8PSAAFQ.mitte.t-com.de> X-Spam-Score: 0.0 (/) X-Scan-Signature: a7d6aff76b15f3f56fcb94490e1052e4 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Ruediger, Thanks for your comments:) See comment in line. B. R. Tina ----- Original Message ----- From: "Geib, Ruediger" To: Cc: Sent: Monday, July 02, 2007 2:16 PM Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Hello Tina, |Even in Pull mode, application layer QoS request (via RSVP) |should be also sent from ingress to the centralized node, in centralized node |the policy is generated, then the decision is made, and then delivers to the |Ingress to enforce. I was not saying that the policy is directly generated in the |Ingress. Even the rather that Push mode should be also taken |into account. Do you have any specific protocol in mind for this purpose (e.g. COPS) or is your aim to look for agreement at this stage and to worry about interfaces and protocols later on? [Tina: I don't have specific protocol in mind. It could be COPS, H.248, Diameter etc. I don't worry about the interfaces and protocols later on. I just highlighted that this typical scenario is not explicitly include in the arch-00 draft yet. And this scenario makes impact on the functionalities of the entities in PCN arch.] Regards, Ruediger [snipped the rest, as no further comment from my side] _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 03 13:19:17 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5m20-0005c9-RC; Tue, 03 Jul 2007 13:19:16 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I5m20-0005bt-Dd for pcn-confirm+ok@megatron.ietf.org; Tue, 03 Jul 2007 13:19:16 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5m1y-0005Xz-Q7 for pcn@ietf.org; Tue, 03 Jul 2007 13:19:14 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I5m1y-0001Ch-8v for pcn@ietf.org; Tue, 03 Jul 2007 13:19:14 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l63HIIK22476 for ; Tue, 3 Jul 2007 17:18:19 GMT X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C7BD96.1871BCB0" Date: Tue, 3 Jul 2007 13:17:54 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651115D555@zcarhxm1.corp.nortel.com> X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: I-D ACTION:draft-babiarz-pcn-3sm-00.txt Thread-Index: Ace9iWWi634qt9N+RbasyEGXvJ9y5AAC1p1w From: "Jozef Babiarz" To: X-Spam-Score: 0.0 (/) X-Scan-Signature: b2809b6f39decc6de467dcf252f42af1 Subject: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. ------_=_NextPart_001_01C7BD96.1871BCB0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, In an email below there is a link to 00 version of pcn-3sm draft that defines metering and marking for admission control and flow termination. We call it three state PCN marking because there are three conditions, packets are not marked, packets marked to indicate that admission of additional flows should be stopped and finally condition where flows are marked to indicate that termination is needed. This draft incorporates the metering and marking approach for flow termination that was defined in draft-babiarz-pcn-explicit-marking-00.=20 Simulation results for the proposed "AR-metering and AS-re-marking" and "SR-metering and ET-re-marking" will be published in a separate draft. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org]=20 Sent: July 3, 2007 11:15 AM To: i-d-announce@ietf.org Subject: I-D ACTION:draft-babiarz-pcn-3sm-00.txt A New Internet-Draft is available from the on-line Internet-Drafts=20 directories. Title : Three State PCN Marking Author(s) : J. Babiarz, et al. Filename : draft-babiarz-pcn-3sm-00.txt Pages : 24 Date : 2007-7-3 =09 This document proposes metering and marking mechanisms for PCN- enabled nodes to label packets with pre-congestion information. The marker marks all PCN packets with an admission-stop (AS) codepoint if the PCN traffic rate on a link exceeds its admissible rate (AR) and when it exceeds its supportable rate (SR), it marks some of those packets exceeding SR with an excess-traffic (ET) codepoint. The flows with ET-marked packets will be terminated until the aggregate PCN traffic on the path decreases below its SR. This document proposes metering and marking mechanisms for these objectives. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt To remove yourself from the I-D Announcement list, send a message to=20 i-d-announce-request@ietf.org with the word unsubscribe in the body of=20 the message.=20 You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce=20 to change your subscription settings. Internet-Drafts are also available by anonymous FTP. Login with the=20 username "anonymous" and a password of your e-mail address. After=20 logging in, type "cd internet-drafts" and then=20 "get draft-babiarz-pcn-3sm-00.txt". A list of Internet-Drafts directories can be found in http://www.ietf.org/shadow.html=20 or ftp://ftp.ietf.org/ietf/1shadow-sites.txt Internet-Drafts can also be obtained by e-mail. Send a message to: mailserv@ietf.org. In the body type: "FILE /internet-drafts/draft-babiarz-pcn-3sm-00.txt". =09 NOTE: The mail server at ietf.org can return the document in MIME-encoded form by using the "mpack" utility. To use this feature, insert the command "ENCODING mime" before the "FILE" command. To decode the response(s), you will need "munpack" or a MIME-compliant mail reader. Different MIME-compliant mail readers exhibit different behavior, especially when dealing with "multipart" MIME messages (i.e. documents which have been split up into multiple messages), so check your local documentation on how to manipulate these messages. Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft. ------_=_NextPart_001_01C7BD96.1871BCB0 Content-Type: application/octet-stream; name="ATT1656204.TXT" Content-Transfer-Encoding: base64 Content-Description: ATT1656204.TXT Content-Disposition: attachment; filename="ATT1656204.TXT" Q29udGVudC1UeXBlOiBNZXNzYWdlL0V4dGVybmFsLWJvZHk7IGFjY2Vzcy10eXBlPSJtYWlsLXNl cnZlciI7DQoJc2VydmVyPSJtYWlsc2VydkBpZXRmLm9yZyINCg0KQ29udGVudC1UeXBlOiB0ZXh0 L3BsYWluDQpDb250ZW50LUlEOiA8MjAwNy03LTMxMDIzNDUuSS1EQGlldGYub3JnPg0KDQpFTkNP RElORyBtaW1lDQpGSUxFIC9pbnRlcm5ldC1kcmFmdHMvZHJhZnQtYmFiaWFyei1wY24tM3NtLTAw LnR4dA0K ------_=_NextPart_001_01C7BD96.1871BCB0 Content-Type: application/octet-stream; name="draft-babiarz-pcn-3sm-00.URL" Content-Transfer-Encoding: base64 Content-Description: draft-babiarz-pcn-3sm-00.URL Content-Disposition: attachment; filename="draft-babiarz-pcn-3sm-00.URL" W0ludGVybmV0U2hvcnRjdXRdDQpVUkw9ZnRwOi8vZnRwLmlldGYub3JnL2ludGVybmV0LWRyYWZ0 cy9kcmFmdC1iYWJpYXJ6LXBjbi0zc20tMDAudHh0DQo= ------_=_NextPart_001_01C7BD96.1871BCB0 Content-Type: text/plain; name="ATT1656205.txt" Content-Transfer-Encoding: base64 Content-Description: ATT1656205.txt Content-Disposition: attachment; filename="ATT1656205.txt" X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18NCkktRC1Bbm5v dW5jZSBtYWlsaW5nIGxpc3QNCkktRC1Bbm5vdW5jZUBpZXRmLm9yZw0KaHR0cHM6Ly93d3cxLmll dGYub3JnL21haWxtYW4vbGlzdGluZm8vaS1kLWFubm91bmNlDQo= ------_=_NextPart_001_01C7BD96.1871BCB0 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn ------_=_NextPart_001_01C7BD96.1871BCB0-- From pcn-bounces@ietf.org Wed Jul 04 03:09:09 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5yz7-0004Ww-91; Wed, 04 Jul 2007 03:09:09 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I5yz5-0004Wc-2w for pcn-confirm+ok@megatron.ietf.org; Wed, 04 Jul 2007 03:09:07 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I5yz1-0004QN-7T for pcn@ietf.org; Wed, 04 Jul 2007 03:09:03 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I5yyk-0003Kt-1x for pcn@ietf.org; Wed, 04 Jul 2007 03:09:03 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 34736792B; Wed, 4 Jul 2007 09:08:45 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 272458319; Wed, 4 Jul 2007 09:08:45 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id E6BCC792B; Wed, 4 Jul 2007 09:08:44 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6478ik17750; Wed, 4 Jul 2007 09:08:44 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 577CD6F58E; Wed, 4 Jul 2007 09:03:14 +0200 (CEST) Message-ID: <468B46E7.3060102@informatik.uni-wuerzburg.de> Date: Wed, 04 Jul 2007 09:06:15 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: philip.eardley@bt.com Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.domain1.systemhost.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 6437e26f1586b9f35812ea5ebeedf4ad Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil et al., after another reading of the PCN architecture draft http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.txt here are some comments. 1. Intro: o The configured-admissible-rates can be chosen small enough that admitted traffic can still be carried after a rerouting in most failure cases. This is an important feature as QoS violations in core networks due to link failures are more likely than QoS violations due to increased traffic volume. appropriate citation: http://www.ieee-infocom.org/2003/papers/10_04.PDF some history: see Section III of http://www3.informatik.uni-wuerzburg.de/~menth/Publications/Menth07-PCN-Config.pdf 2. Terminology: I would like to have discussed also the nomenclature in the Three State PCN Marking draft: http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt 3. Assumptions: Should headlines be uppercase or lowercase (cf. 3., 3.1, 3.2, ...)? Is only a single PCN in the scope of the current charter or several PCN classes with different scheduling priority? We had some discussion on this earlier. This issue also relates to the bullet list at the end of Section 4. 4. High-level functional architecture I think it makes sense to define the term "pre-congestion": a link with capacity C is pre-congested with regard to a rate threshold R Hi all, > > Just a reminder that all comments on this draft would be great. It aims > to describe the PCN architecture, in light of the PCN WG's Charter & its > Milestone of an Info doc on 'Flow Admission and Termination Architecture > within a Diffserv Domain' (due Nov 07). > > S1 Introduction. > This is quite short. If desired, it could be boosted with a general > explanation of where PCN fits into the picture of QoS and how it's > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) > > S2 Terminology > In the "Editor's note" are 3 alternative terms that some of the authors > preferred. > > S3 Assumptions and constraints on scope > These are the 4 things mentioned in the Charter, plus some explanation > of them. Are they clear? Also we mention some of the ways that a future > revised Charter might look at overcoming some of the > constraints/assumptions; is this sub-section at the right depth? > > S4 High-level functional architecture > We have tried to write this section (and the following ones) so that it > fits all the various proposals there've been for PCN mechanisms. Does > this make the section too wishy-washy or too hard to understand? Should > it include some comparison of the different mechanisms proposed > (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? > > S5 Detailed Functional architecture > Is this a reasonable description of the extra functionality that PCN > requires on various nodes in the PCN-domain? Is it the right way to > split up the description? For clarity / help reader's understanding, > should there be some specific examples of how functionality might be > distributed (eg "if you followed the deployment model in > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made at > the PCN-egress-node, communicated to the PCN-ingress-nodes which makes > the admission decision; etc.") > > S6 Design goals and challenges > This briefly describes some open issues, taken from > briscoe-tsvwg-cl-architecture. Are there other ones that should be > mentioned? Is the problem description at the right level of depth? > Should we discuss various possible solutions to these problems? > > S7 Deployment scenarios > Briefly describes some deployment scenarios for pcn? is this at the > right level of depth? > > S8 Operations and Management > This section was written in response to the Charter saying that the > architecture document should include security, manageability and > operational considerations. The draft addresses this by providing some > thoughts under the FCAPS headings: OAM of Faults, Configuration, > Accounting, Performance and Security? Is this the right way of > structuring it - does it cover the right set of topics? Is the text at > the right level? - eg should it also have a detailed set of parameters > that would be available for configuration? > > An overall question is whether the draft should have more comparison of > the options (pros/cons) for various aspects. > > I aim to edit another version of the draft before the ietf (but maybe > not before the deadline as I'm on hols next week). > > Thanks! > Phil/ > > > >> -----Original Message----- >> From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> Sent: 22 June 2007 04:38 >> To: pcn@ietf.org >> Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >> >> Hi all: >> Please see the attached E-Mail on the posting of the PCN Architecture >> draft. >> On behave of the editor of this draft: Phil, and the co-authors of >> > this > >> draft, >> we would like to request for reviews and comments of this draft and >> welcome >> any comments for improvements. >> >> Please send your comments/discussions of this draft on the PCN list. >> >> Thank you for your interest and review of this draft! >> -- Kwok on behave of the co-authors of this draft -- >> >> >> >>> To: i-d-announce@ietf.org >>> Cc: >>> From: Internet-Drafts@ietf.org >>> Date: Thu, 21 Jun 2007 15:50:02 -0400 >>> X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 >>> Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt >>> X-BeenThere: i-d-announce@ietf.org >>> X-Mailman-Version: 2.1.5 >>> Reply-To: internet-drafts@ietf.org >>> List-Id: i-d-announce.ietf.org >>> List-Unsubscribe: >>> > , > >>> >>> List-Archive: >>> List-Post: >>> List-Help: >>> List-Subscribe: >>> > , > >>> >>> X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, >>> NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=4 >>> X-Spam-Score: 5.3 >>> X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >>> >> ecarhea1.nortel.com >> >>> X-DNSBL-Score: -50 >>> X-DNSBL-Servers: bl.nortel.com >>> X-SMTP-HELO: megatron.ietf.org >>> X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >>> X-SMTP-RCPT-TO: >>> >> kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel >> > .c > > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel > .c > > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c > om > >>> X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] >>> X-SMTP-REASON: PASSED >>> X-SMTP-ID: 1182455563.14011407 >>> X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) >>> FILETIME=[BC4965C0:01C7B43D] >>> >>> A New Internet-Draft is available from the on-line Internet-Drafts >>> directories. >>> >>> >>> Title : Pre-Congestion Notification Architecture >>> Author(s) : P. Eardley, et al. >>> Filename : draft-eardley-pcn-architecture-00.txt >>> Pages : 27 >>> Date : 2007-6-21 >>> >>> The purpose of this document is to describe a general >>> > architecture > >>> for flow admission and termination based on aggregated (pre-) >>> congestion information in order to protect the quality of service >>> > of > >>> established inelastic flows within a single DiffServ domain. >>> >>> >>> A URL for this Internet-Draft is: >>> >> http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t >> > xt > >>> To remove yourself from the I-D Announcement list, send a message to >>> i-d-announce-request@ietf.org with the word unsubscribe in the body >>> > of > >>> the message. >>> You can also visit >>> > https://www1.ietf.org/mailman/listinfo/I-D-announce > >>> to change your subscription settings. >>> >>> Internet-Drafts are also available by anonymous FTP. Login with the >>> username "anonymous" and a password of your e-mail address. After >>> logging in, type "cd internet-drafts" and then >>> "get draft-eardley-pcn-architecture-00.txt". >>> >>> A list of Internet-Drafts directories can be found in >>> http://www.ietf.org/shadow.html >>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >>> >>> Internet-Drafts can also be obtained by e-mail. >>> >>> Send a message to: >>> mailserv@ietf.org. >>> In the body type: >>> "FILE >>> > /internet-drafts/draft-eardley-pcn-architecture-00.txt". > >>> NOTE: The mail server at ietf.org can return the document in >>> MIME-encoded form by using the "mpack" utility. To use this >>> feature, insert the command "ENCODING mime" before the >>> > "FILE" > >>> command. To decode the response(s), you will need "munpack" >>> > or > >>> a MIME-compliant mail reader. Different MIME-compliant mail >>> >> readers >> >>> exhibit different behavior, especially when dealing with >>> "multipart" MIME messages (i.e. documents which have been >>> > split > >>> up into multiple messages), so check your local >>> > documentation on > >>> how to manipulate these messages. >>> >>> Below is the data which will enable a MIME compliant mail reader >>> implementation to automatically retrieve the ASCII version of the >>> Internet-Draft. >>> >>> Content-Type: text/plain >>> Content-ID: <2007-6-21120238.I-D@ietf.org> >>> >>> ENCODING mime >>> FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt >>> >>> >>> >> >> 00.txt> >> >>> _______________________________________________ >>> I-D-Announce mailing list >>> I-D-Announce@ietf.org >>> https://www1.ietf.org/mailman/listinfo/i-d-announce >>> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 04 09:14:33 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I64gi-00062E-Hv; Wed, 04 Jul 2007 09:14:32 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I64gh-000621-4P for pcn-confirm+ok@megatron.ietf.org; Wed, 04 Jul 2007 09:14:31 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I64gg-00061t-Nu for pcn@ietf.org; Wed, 04 Jul 2007 09:14:30 -0400 Received: from zrtps0kn.nortel.com ([47.140.192.55]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I64gW-0004KJ-1O for pcn@ietf.org; Wed, 04 Jul 2007 09:14:30 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kn.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l64DEHF05838; Wed, 4 Jul 2007 13:14:17 GMT X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Wed, 4 Jul 2007 09:14:14 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651115DDBB@zcarhxm1.corp.nortel.com> In-Reply-To: <468B46E7.3060102@informatik.uni-wuerzburg.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: Ace+Cj1aAK/MtIFtRaeKYcT0Tdiv9gAL1itQ From: "Jozef Babiarz" To: , X-Spam-Score: 0.0 (/) X-Scan-Signature: 9178bae9f85419fdc08e9f2c86e345d0 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Michael wrote: >3. Assumptions: > >Is only a single PCN in the scope of the current charter or several PCN >classes with different scheduling priority? We had some discussion on=20 >this earlier. This issue also relates to the bullet list at the end of=20 >Section 4. [Joe]I believe that PCN architecture should assume that there may be one or more PCN classes in a domain. The architecture states that Diffserv is used in the domain so multiple service classes are possible and the PCN mechanism may be applied to one or more service classes that support real-time inelastic traffic. =20 >5. Detailed Functional architecture > >Comment to probing: probe packets need to have the same header as data=20 >packet, otherwise might be transported over different paths when ECMP is=20 >on and flow-based load distribution is based on hash values of the=20 >packet headers. Then, my next question is: how does the PCN egress node >recognize a probe packet as a such? I think that this is a fundamental=20 >problem which requires a standardized solution that is essential to a=20 >signalling draft. Therefore, it might be worth mentioning. [Joe]I think we need to identify methods where the interior nodes from routing perspective can threat probe packets as PCN data but egress node can easily identify them as probe packets. I also believe that the probe concept could be used to convey ingress node's address to the egress node so that egress knows which ingress node to send PCN pre-congestion information. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de]=20 Sent: July 4, 2007 3:06 AM To: philip.eardley@bt.com Cc: pcn@ietf.org Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Hi Phil et al., after another reading of the PCN architecture draft http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.tx t here are some comments. 1. Intro: o The configured-admissible-rates can be chosen small enough that=20 admitted traffic can still be carried after a rerouting in most failure=20 cases. This is an important feature as QoS violations in core networks=20 due to link failures are more likely than QoS violations due to=20 increased traffic volume. appropriate citation: http://www.ieee-infocom.org/2003/papers/10_04.PDF some history: see Section III of http://www3.informatik.uni-wuerzburg.de/~menth/Publications/Menth07-PCN- Config.pdf 2. Terminology: I would like to have discussed also the nomenclature in the Three State=20 PCN Marking draft: http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt 3. Assumptions: Should headlines be uppercase or lowercase (cf. 3., 3.1, 3.2, ...)? Is only a single PCN in the scope of the current charter or several PCN=20 classes with different scheduling priority? We had some discussion on=20 this earlier. This issue also relates to the bullet list at the end of=20 Section 4. 4. High-level functional architecture I think it makes sense to define the term "pre-congestion": a link with=20 capacity C is pre-congested with regard to a rate threshold R Hi all, > > Just a reminder that all comments on this draft would be great. It aims > to describe the PCN architecture, in light of the PCN WG's Charter & its > Milestone of an Info doc on 'Flow Admission and Termination Architecture > within a Diffserv Domain' (due Nov 07). > > S1 Introduction.=20 > This is quite short. If desired, it could be boosted with a general > explanation of where PCN fits into the picture of QoS and how it's > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) > > S2 Terminology > In the "Editor's note" are 3 alternative terms that some of the authors > preferred.=20 > > S3 Assumptions and constraints on scope > These are the 4 things mentioned in the Charter, plus some explanation > of them. Are they clear? Also we mention some of the ways that a future > revised Charter might look at overcoming some of the > constraints/assumptions; is this sub-section at the right depth? > > S4 High-level functional architecture > We have tried to write this section (and the following ones) so that it > fits all the various proposals there've been for PCN mechanisms. Does > this make the section too wishy-washy or too hard to understand? Should > it include some comparison of the different mechanisms proposed > (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? > > S5 Detailed Functional architecture > Is this a reasonable description of the extra functionality that PCN > requires on various nodes in the PCN-domain? Is it the right way to > split up the description? For clarity / help reader's understanding, > should there be some specific examples of how functionality might be > distributed (eg "if you followed the deployment model in > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made at > the PCN-egress-node, communicated to the PCN-ingress-nodes which makes > the admission decision; etc.") > > S6 Design goals and challenges > This briefly describes some open issues, taken from > briscoe-tsvwg-cl-architecture. Are there other ones that should be > mentioned? Is the problem description at the right level of depth? > Should we discuss various possible solutions to these problems? > > S7 Deployment scenarios > Briefly describes some deployment scenarios for pcn? is this at the > right level of depth? > > S8 Operations and Management > This section was written in response to the Charter saying that the > architecture document should include security, manageability and > operational considerations. The draft addresses this by providing some > thoughts under the FCAPS headings: OAM of Faults, Configuration, > Accounting, Performance and Security? Is this the right way of > structuring it - does it cover the right set of topics? Is the text at > the right level? - eg should it also have a detailed set of parameters > that would be available for configuration?=20 > > An overall question is whether the draft should have more comparison of > the options (pros/cons) for various aspects. > > I aim to edit another version of the draft before the ietf (but maybe > not before the deadline as I'm on hols next week). > > Thanks! > Phil/=20 > > > =20 >> -----Original Message----- >> From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> Sent: 22 June 2007 04:38 >> To: pcn@ietf.org >> Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >> >> Hi all: >> Please see the attached E-Mail on the posting of the PCN Architecture >> draft. >> On behave of the editor of this draft: Phil, and the co-authors of >> =20 > this > =20 >> draft, >> we would like to request for reviews and comments of this draft and >> welcome >> any comments for improvements. >> >> Please send your comments/discussions of this draft on the PCN list. >> >> Thank you for your interest and review of this draft! >> -- Kwok on behave of the co-authors of this draft -- >> >> >> =20 >>> To: i-d-announce@ietf.org >>> Cc: >>> From: Internet-Drafts@ietf.org >>> Date: Thu, 21 Jun 2007 15:50:02 -0400 >>> X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 >>> Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt >>> X-BeenThere: i-d-announce@ietf.org >>> X-Mailman-Version: 2.1.5 >>> Reply-To: internet-drafts@ietf.org >>> List-Id: i-d-announce.ietf.org >>> List-Unsubscribe: >>> =20 > , > =20 >>> >>> List-Archive: >>> List-Post: >>> List-Help: >>> List-Subscribe: >>> =20 > , > =20 >>> >>> X-Spam-Tests: FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, >>> NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D4 >>> X-Spam-Score: 5.3 >>> X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >>> =20 >> ecarhea1.nortel.com >> =20 >>> X-DNSBL-Score: -50 >>> X-DNSBL-Servers: bl.nortel.com >>> X-SMTP-HELO: megatron.ietf.org >>> X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >>> X-SMTP-RCPT-TO: >>> =20 >> kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel >> =20 > .c > =20 > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel > .c > =20 > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c > om > =20 >>> X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] >>> X-SMTP-REASON: PASSED >>> X-SMTP-ID: 1182455563.14011407 >>> X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) >>> FILETIME=3D[BC4965C0:01C7B43D] >>> >>> A New Internet-Draft is available from the on-line Internet-Drafts >>> directories. >>> >>> >>> Title : Pre-Congestion Notification Architecture >>> Author(s) : P. Eardley, et al. >>> Filename : draft-eardley-pcn-architecture-00.txt >>> Pages : 27 >>> Date : 2007-6-21 >>> >>> The purpose of this document is to describe a general >>> =20 > architecture > =20 >>> for flow admission and termination based on aggregated (pre-) >>> congestion information in order to protect the quality of service >>> =20 > of > =20 >>> established inelastic flows within a single DiffServ domain. >>> >>> >>> A URL for this Internet-Draft is: >>> =20 >> http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t >> =20 > xt > =20 >>> To remove yourself from the I-D Announcement list, send a message to >>> i-d-announce-request@ietf.org with the word unsubscribe in the body >>> =20 > of > =20 >>> the message. >>> You can also visit >>> =20 > https://www1.ietf.org/mailman/listinfo/I-D-announce > =20 >>> to change your subscription settings. >>> >>> Internet-Drafts are also available by anonymous FTP. Login with the >>> username "anonymous" and a password of your e-mail address. After >>> logging in, type "cd internet-drafts" and then >>> "get draft-eardley-pcn-architecture-00.txt". >>> >>> A list of Internet-Drafts directories can be found in >>> http://www.ietf.org/shadow.html >>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >>> >>> Internet-Drafts can also be obtained by e-mail. >>> >>> Send a message to: >>> mailserv@ietf.org. >>> In the body type: >>> "FILE >>> =20 > /internet-drafts/draft-eardley-pcn-architecture-00.txt". > =20 >>> NOTE: The mail server at ietf.org can return the document in >>> MIME-encoded form by using the "mpack" utility. To use this >>> feature, insert the command "ENCODING mime" before the >>> =20 > "FILE" > =20 >>> command. To decode the response(s), you will need "munpack" >>> =20 > or > =20 >>> a MIME-compliant mail reader. Different MIME-compliant mail >>> =20 >> readers >> =20 >>> exhibit different behavior, especially when dealing with >>> "multipart" MIME messages (i.e. documents which have been >>> =20 > split > =20 >>> up into multiple messages), so check your local >>> =20 > documentation on > =20 >>> how to manipulate these messages. >>> >>> Below is the data which will enable a MIME compliant mail reader >>> implementation to automatically retrieve the ASCII version of the >>> Internet-Draft. >>> >>> Content-Type: text/plain >>> Content-ID: <2007-6-21120238.I-D@ietf.org> >>> >>> ENCODING mime >>> FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt >>> >>> >>> >> =20 >> 00.txt> >> =20 >>> _______________________________________________ >>> I-D-Announce mailing list >>> I-D-Announce@ietf.org >>> https://www1.ietf.org/mailman/listinfo/i-d-announce >>> =20 >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> =20 > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > =20 --=20 Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 04 10:19:45 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I65ho-0001Zo-Nn; Wed, 04 Jul 2007 10:19:44 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I65hm-0001Zj-Ra for pcn-confirm+ok@megatron.ietf.org; Wed, 04 Jul 2007 10:19:42 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I65hm-0001Zb-Hx for pcn@ietf.org; Wed, 04 Jul 2007 10:19:42 -0400 Received: from rotterdam.ewi.utwente.nl ([130.89.10.5]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I65hi-0002u9-19 for pcn@ietf.org; Wed, 04 Jul 2007 10:19:42 -0400 Received: from utip105 (utip105.ewi.utwente.nl [130.89.13.76]) by rotterdam.ewi.utwente.nl (8.13.6/8.13.6) with ESMTP id l64EJ5Dk028007; Wed, 4 Jul 2007 16:19:34 +0200 (MEST) From: "Georgios Karagiannis" To: "'Jozef Babiarz'" , , References: <468B46E7.3060102@informatik.uni-wuerzburg.de> <9671A92C3C8B5744BC97F855F7CB64651115DDBB@zcarhxm1.corp.nortel.com> Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Wed, 4 Jul 2007 16:19:00 +0200 Message-ID: <000901c7be46$4c165a70$4c0d5982@dynamic.ewi.utwente.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <9671A92C3C8B5744BC97F855F7CB64651115DDBB@zcarhxm1.corp.nortel.com> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Thread-Index: Ace+Cj1aAK/MtIFtRaeKYcT0Tdiv9gAL1itQAALwabA= X-Spam-Score: 0.11 () FVGT_s_MULTI_OBFU_2 X-Scanned-By: MIMEDefang 2.52 on 130.89.10.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0rc3 (rotterdam.ewi.utwente.nl [130.89.10.5]); Wed, 04 Jul 2007 16:19:36 +0200 (MEST) X-Spam-Score: 0.0 (/) X-Scan-Signature: d094b18a574860cb9e2fe5fedfbcc179 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Joe, Hi Michael Please see in line! > -----Original Message----- > From: Jozef Babiarz [mailto:babiarz@nortel.com] > Sent: woensdag 4 juli 2007 15:14 > To: menth@informatik.uni-wuerzburg.de; philip.eardley@bt.com > Cc: pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt > > Michael wrote: > >3. Assumptions: > > > >Is only a single PCN in the scope of the current charter or > several PCN > > >classes with different scheduling priority? We had some > discussion on > >this earlier. This issue also relates to the bullet list at > the end of > >Section 4. > > [Joe]I believe that PCN architecture should assume that there > may be one or more PCN classes in a domain. The architecture > states that Diffserv is used in the domain so multiple > service classes are possible and the PCN mechanism may be > applied to one or more service classes that support real-time > inelastic traffic. [Georgios] I think that it has not been decided yet, whether the PCN architecture should assume that there might be one or more PCN classes in a domain. > > > >5. Detailed Functional architecture > > > >Comment to probing: probe packets need to have the same > header as data > >packet, otherwise might be transported over different paths when ECMP > is > >on and flow-based load distribution is based on hash values of the > >packet headers. Then, my next question is: how does the PCN > egress node > > >recognize a probe packet as a such? I think that this is a > fundamental > >problem which requires a standardized solution that is > essential to a > >signalling draft. Therefore, it might be worth mentioning. > > [Joe]I think we need to identify methods where the interior > nodes from routing perspective can threat probe packets as > PCN data but egress node can easily identify them as probe > packets. I also believe that the probe concept could be used > to convey ingress node's address to the egress node so that > egress knows which ingress node to send PCN pre-congestion > information. [Georgios] I agree with Joe's proposal that an PCN interior node should treat probe packets as PCN data but the PCN egress node should easily identify them as probe packets. Best regards, Georgios > > Regards, Joe > email:babiarz@nortel.com > Telephone:613-763-6098 > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] > Sent: July 4, 2007 3:06 AM > To: philip.eardley@bt.com > Cc: pcn@ietf.org > Subject: Re: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt > > Hi Phil et al., > > after another reading of the PCN architecture draft > http://www.ietf.org/internet-drafts/draft-eardley-pcn-architec > ture-00.tx > t > here are some comments. > > 1. Intro: > > o The configured-admissible-rates can be chosen small > enough that admitted traffic can still be carried after a > rerouting in most failure cases. This is an important > feature as QoS violations in core networks due to link > failures are more likely than QoS violations due to increased > traffic volume. > > appropriate citation: > http://www.ieee-infocom.org/2003/papers/10_04.PDF > > some history: see Section III of > http://www3.informatik.uni-wuerzburg.de/~menth/Publications/Me > nth07-PCN- > Config.pdf > > 2. Terminology: > > I would like to have discussed also the nomenclature in the > Three State PCN Marking draft: > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt > > 3. Assumptions: > > Should headlines be uppercase or lowercase (cf. 3., 3.1, 3.2, ...)? > > Is only a single PCN in the scope of the current charter or > several PCN classes with different scheduling priority? We > had some discussion on this earlier. This issue also relates > to the bullet list at the end of Section 4. > > > 4. High-level functional architecture > > I think it makes sense to define the term "pre-congestion": a > link with capacity C is pre-congested with regard to a rate > threshold R applies both to the configurable-admission-rate and > configurable-termination-rate thresholds, i.e., there are > different types of pre-congestion. We introduced this notion > in Section 2 of the "Three State PCN Marking" > draft: > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt > > > 5. Detailed Functional architecture > > Comment to probing: probe packets need to have the same > header as data packet, otherwise might be transported over > different paths when ECMP is > > on and flow-based load distribution is based on hash values > of the packet headers. Then, my next question is: how does > the PCN egress node recognize a probe packet as a such? I > think that this is a fundamental problem which requires a > standardized solution that is essential to a signalling > draft. Therefore, it might be worth mentioning. > > Regards, > > Michael > > philip.eardley@bt.com wrote: > > Hi all, > > > > Just a reminder that all comments on this draft would be great. It > aims > > to describe the PCN architecture, in light of the PCN WG's Charter & > its > > Milestone of an Info doc on 'Flow Admission and Termination > Architecture > > within a Diffserv Domain' (due Nov 07). > > > > S1 Introduction. > > This is quite short. If desired, it could be boosted with a general > > explanation of where PCN fits into the picture of QoS and how it's > > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) > > > > S2 Terminology > > In the "Editor's note" are 3 alternative terms that some of the > authors > > preferred. > > > > S3 Assumptions and constraints on scope These are the 4 things > > mentioned in the Charter, plus some explanation of them. Are they > > clear? Also we mention some of the ways that a > future > > revised Charter might look at overcoming some of the > > constraints/assumptions; is this sub-section at the right depth? > > > > S4 High-level functional architecture > > We have tried to write this section (and the following ones) so that > it > > fits all the various proposals there've been for PCN > mechanisms. Does > > this make the section too wishy-washy or too hard to understand? > Should > > it include some comparison of the different mechanisms proposed > > (PCN-interior-node marking algorithms & PCN-boundary-node > reactions)? > > > > S5 Detailed Functional architecture > > Is this a reasonable description of the extra functionality > that PCN > > requires on various nodes in the PCN-domain? Is it the right way to > > split up the description? For clarity / help reader's > understanding, > > should there be some specific examples of how functionality > might be > > distributed (eg "if you followed the deployment model in > > draft-briscoe-tsvwg-cl-architecture-04, then this > measurement is made > at > > the PCN-egress-node, communicated to the PCN-ingress-nodes > which makes > > the admission decision; etc.") > > > > S6 Design goals and challenges > > This briefly describes some open issues, taken from > > briscoe-tsvwg-cl-architecture. Are there other ones that should be > > mentioned? Is the problem description at the right level of depth? > > Should we discuss various possible solutions to these problems? > > > > S7 Deployment scenarios > > Briefly describes some deployment scenarios for pcn? is this at the > > right level of depth? > > > > S8 Operations and Management > > This section was written in response to the Charter saying that the > > architecture document should include security, manageability and > > operational considerations. The draft addresses this by > providing some > > thoughts under the FCAPS headings: OAM of Faults, Configuration, > > Accounting, Performance and Security? Is this the right way of > > structuring it - does it cover the right set of topics? Is > the text at > > the right level? - eg should it also have a detailed set of > parameters > > that would be available for configuration? > > > > An overall question is whether the draft should have more comparison > of > > the options (pros/cons) for various aspects. > > > > I aim to edit another version of the draft before the ietf > (but maybe > > not before the deadline as I'm on hols next week). > > > > Thanks! > > Phil/ > > > > > > > >> -----Original Message----- > >> From: Kwok-Ho Chan [mailto:khchan@nortel.com] > >> Sent: 22 June 2007 04:38 > >> To: pcn@ietf.org > >> Subject: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt > >> > >> Hi all: > >> Please see the attached E-Mail on the posting of the PCN > Architecture > >> draft. > >> On behave of the editor of this draft: Phil, and the co-authors of > >> > > this > > > >> draft, > >> we would like to request for reviews and comments of this > draft and > >> welcome any comments for improvements. > >> > >> Please send your comments/discussions of this draft on the > PCN list. > >> > >> Thank you for your interest and review of this draft! > >> -- Kwok on behave of the co-authors of this draft -- > >> > >> > >> > >>> To: i-d-announce@ietf.org > >>> Cc: > >>> From: Internet-Drafts@ietf.org > >>> Date: Thu, 21 Jun 2007 15:50:02 -0400 > >>> X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 > >>> Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt > >>> X-BeenThere: i-d-announce@ietf.org > >>> X-Mailman-Version: 2.1.5 > >>> Reply-To: internet-drafts@ietf.org > >>> List-Id: i-d-announce.ietf.org > >>> List-Unsubscribe: > >>> > > , > > > >>> > >>> List-Archive: > >>> List-Post: > >>> List-Help: > >>> List-Subscribe: > >>> > > , > > > >>> > >>> X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, > >>> NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=4 > >>> X-Spam-Score: 5.3 > >>> X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > >>> > >> ecarhea1.nortel.com > >> > >>> X-DNSBL-Score: -50 > >>> X-DNSBL-Servers: bl.nortel.com > >>> X-SMTP-HELO: megatron.ietf.org > >>> X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > >>> X-SMTP-RCPT-TO: > >>> > >> > kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharra > th@nortel > >> > > .c > > > > > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmo > nds@nortel > > .c > > > > > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khcha > n@nortel.c > > om > > > >>> X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] > >>> X-SMTP-REASON: PASSED > >>> X-SMTP-ID: 1182455563.14011407 > >>> X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) > >>> FILETIME=[BC4965C0:01C7B43D] > >>> > >>> A New Internet-Draft is available from the on-line > Internet-Drafts > >>> directories. > >>> > >>> > >>> Title : Pre-Congestion Notification Architecture > >>> Author(s) : P. Eardley, et al. > >>> Filename : draft-eardley-pcn-architecture-00.txt > >>> Pages : 27 > >>> Date : 2007-6-21 > >>> > >>> The purpose of this document is to describe a general > >>> > > architecture > > > >>> for flow admission and termination based on aggregated (pre-) > >>> congestion information in order to protect the quality > of service > >>> > > of > > > >>> established inelastic flows within a single DiffServ domain. > >>> > >>> > >>> A URL for this Internet-Draft is: > >>> > >> > http://www.ietf.org/internet-drafts/draft-eardley-pcn-architec > ture-00.t > >> > > xt > > > >>> To remove yourself from the I-D Announcement list, send a > message to > >>> i-d-announce-request@ietf.org with the word unsubscribe > in the body > >>> > > of > > > >>> the message. > >>> You can also visit > >>> > > https://www1.ietf.org/mailman/listinfo/I-D-announce > > > >>> to change your subscription settings. > >>> > >>> Internet-Drafts are also available by anonymous FTP. > Login with the > >>> username "anonymous" and a password of your e-mail address. After > >>> logging in, type "cd internet-drafts" and then "get > >>> draft-eardley-pcn-architecture-00.txt". > >>> > >>> A list of Internet-Drafts directories can be found in > >>> http://www.ietf.org/shadow.html or > >>> ftp://ftp.ietf.org/ietf/1shadow-sites.txt > >>> > >>> Internet-Drafts can also be obtained by e-mail. > >>> > >>> Send a message to: > >>> mailserv@ietf.org. > >>> In the body type: > >>> "FILE > >>> > > /internet-drafts/draft-eardley-pcn-architecture-00.txt". > > > >>> NOTE: The mail server at ietf.org can return the document in > >>> MIME-encoded form by using the "mpack" utility. > To use this > >>> feature, insert the command "ENCODING mime" before the > >>> > > "FILE" > > > >>> command. To decode the response(s), you will > need "munpack" > >>> > > or > > > >>> a MIME-compliant mail reader. Different > MIME-compliant mail > >>> > >> readers > >> > >>> exhibit different behavior, especially when dealing with > >>> "multipart" MIME messages (i.e. documents which have been > >>> > > split > > > >>> up into multiple messages), so check your local > >>> > > documentation on > > > >>> how to manipulate these messages. > >>> > >>> Below is the data which will enable a MIME compliant mail reader > >>> implementation to automatically retrieve the ASCII version of the > >>> Internet-Draft. > >>> > >>> Content-Type: text/plain > >>> Content-ID: <2007-6-21120238.I-D@ietf.org> > >>> > >>> ENCODING mime > >>> FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt > >>> > >>> > >>> > >>> > >> 00.txt> > >> > >>> _______________________________________________ > >>> I-D-Announce mailing list > >>> I-D-Announce@ietf.org > >>> https://www1.ietf.org/mailman/listinfo/i-d-announce > >>> > >> _______________________________________________ > >> PCN mailing list > >> PCN@ietf.org > >> https://www1.ietf.org/mailman/listinfo/pcn > >> > > > > > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn > > > > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science Am > Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 04 11:29:25 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I66nF-0003rd-26; Wed, 04 Jul 2007 11:29:25 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I66nD-0003nf-Lh for pcn-confirm+ok@megatron.ietf.org; Wed, 04 Jul 2007 11:29:23 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I66nD-0003lt-At for pcn@ietf.org; Wed, 04 Jul 2007 11:29:23 -0400 Received: from smtp.nokia.com ([131.228.20.171] helo=mgw-ext12.nokia.com) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I66n8-00030v-D6 for pcn@ietf.org; Wed, 04 Jul 2007 11:29:23 -0400 Received: from esebh107.NOE.Nokia.com (esebh107.ntc.nokia.com [172.21.143.143]) by mgw-ext12.nokia.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id l64FTDKJ005824 for ; Wed, 4 Jul 2007 18:29:16 +0300 Received: from esebh103.NOE.Nokia.com ([172.21.143.33]) by esebh107.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 4 Jul 2007 18:29:14 +0300 Received: from esebh101.NOE.Nokia.com ([172.21.138.177]) by esebh103.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 4 Jul 2007 18:29:14 +0300 Received: from mgw-int02.ntc.nokia.com ([172.21.143.97]) by esebh101.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.1830); Wed, 4 Jul 2007 18:29:14 +0300 Received: from [172.21.34.161] (esdhcp034161.research.nokia.com [172.21.34.161]) by mgw-int02.ntc.nokia.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id l64FTDJg024887 for ; Wed, 4 Jul 2007 18:29:13 +0300 Mime-Version: 1.0 (Apple Message framework v752.3) In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.domain1.systemhost.net> References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.domain1.systemhost.net> Message-Id: <0172B5B5-3540-4ABF-A341-0DD4C20B8AF5@nokia.com> From: Lars Eggert Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Wed, 4 Jul 2007 18:29:07 +0300 To: pcn@ietf.org X-Mailer: Apple Mail (2.752.3) X-OriginalArrivalTime: 04 Jul 2007 15:29:14.0473 (UTC) FILETIME=[13F36D90:01C7BE50] X-Nokia-AV: Clean X-Spam-Score: 0.0 (/) X-Scan-Signature: f8184d7d4d1b986353eb58ea3e887935 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0984663922==" Errors-To: pcn-bounces@ietf.org --===============0984663922== Content-Type: multipart/signed; micalg=sha1; boundary=Apple-Mail-37--902682066; protocol="application/pkcs7-signature" --Apple-Mail-37--902682066 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi, I briefly read over this document. I think it generally goes into the right direction and is very complete for a -00 draft - nice job. I do have some comments, however: Section 1., paragraph 2: > Each link of the PCN- > domain can be associated with a configured-admissible-rate and a > configured-termination-rate. If PCN-traffic, that is traffic in the > DiffServ class(es) subject to the PCN mechanisms, on the link exceeds > these rates then PCN-packets are admission-marked or termination- > marked. This paragraph and the related text in the remainder of the document imply some particular technical directions: (1) marking is done based on pre-configured rates, rather than, for example, queue dynamics, and (2) there are two kinds of explicit markings (admission/termination), rather than, for example, basing the admission/termination decision on the arrival dynamic changes of a single marking over a sampling interval. Was this a deliberate choice of the authors? Section 2., paragraph 0: > 2. Terminology I'd be good to reuse or extend the definitions in RFC2475. Section 4., paragraph 1: > After completion of the initial phase, the PCN WG may re- charter to > consider applying the PCN mechanisms to additional deployment > scenarios (operation over concatenated DiffServ domains, PCN-aware > application mechanisms, etc.). The WG may also re-charter to develop > solutions for scenarios where some of these restrictions are not in > place. For example, the WG might consider other response mechanisms > that act on (pre-)congestion information, for example flow-rate > adaptation by elastic applications (rather than flow admission or > termination); and the WG might consider operating PCN over > concatenated PCN-domains that don't trust each other, using re- ECN, > I-D.briscoe-tsvwg-re-ecn-border-cheat [8] or similar techniques. The > details of these work items are outside the scope of the initial > phase, but the WG may consider their requirements in order to design > components that are sufficiently general to support such extensions > in the future - the working assumption is that the standards > developed in the initial phase should not need to be modified to > satisfy the solutions for when these restrictions are removed. The architecture document is not the place to discuss what the WG may do in the future, especially because the text above subtly differs from the charter. Suggest to cut this part. Section 4., paragraph 3: > o PCN-boundary-nodes at the edge of the PCN-domain, which control > admission of new PCN-flows and termination of existing PCN- flows, > based on information from PCN-interior-node. This information is > in the form of the PCN-marked data packets and not signalling > messages. PCN-ingress-nodes are flow-aware (required for policing > purposes) In several deployment scenarios PCN-egress-nodes will > also be flow aware. For example I-D.briscoe-tsvwg-cl- architecture > [2]describes a deployment scenario where RSVP messages are > processed at both the PCN-ingress-node and PCN-egress-node (but > not at any PCN-interior-nodes), and both store associated per flow > state. If "some deployment scenarios" that the architecture is supposed to support require per flow-state on other nodes that the PCN-ingress-nodes, then that means that the architecture as a whole must support that. Because ingress nodes will usually also be egress nodes, and vice versa, that isn't actually a large change, but making this explicit is good IMO. Section 4., paragraph 12: > At a high level, flow termination control works as follows. Each > PCN-node termination-marks PCN-packets in a similar fashion to above. > An obvious approach is for the algorithm to use instead a configured- > termination-rate (which is higher than the configured-admissible- > rate) and the encoding to use another packet marking; however there > is also a proposal to use the same configured-admissible-rate and the > same encoding. Several approaches have been proposed to date about > how to convert this information into a flow termination decision; at > a high level these are as follows: OK, this makes it clear that the details of the marking aren't fixed yet (see my first comment.) Suggest to rephrase the text that talks about two types of markings through the document. Section 4., paragraph 20: > but for example I-D.lefaucheur-rsvp-ecn [9]describes the extensions > needed for RSVP. draft-lefaucheur-rsvp-ecn doesn't exist in the tracker? Section 4., paragraph 21: > The following are some high-level points about how PCN works: > > o There needs to be a way for a PCN-node to distinguish PCN- traffic > from non PCN-traffic. This is based on the DSCP field and/ or ECN > field. The PCN mechanisms may be applied to more than one traffic > class (which are distinguished by DSCP). > > o There may be traffic that is more important than PCN, perhaps a > particular application or an operator's control messages. A PCN- > node may dedicate capacity to such traffic or priority schedule it > over PCN. In the latter case its traffic needs to contribute to > the PCN meters. > > o There will be traffic less important than PCN. For instance best > effort or assured forwarding traffic (assuming PCN is being > applied to the Expedited forwarding class). It will be scheduled > at lower priority than PCN, and use a separate queue or queues. > However, a PCN-node may dedicate some capacity to lower priority > traffic so that it isn't starved. > > o There may be other traffic with the same priority as PCN- traffic. > For instance, Expedited Forwarding sessions that are originated > either without capacity admission or with traffic engineering, and > EF sessions that are originated using PCN admission control. In > I-D.ietf-tsvwg-admitted-realtime-dscp [5] the two traffic classes > are called EF and EF-ADMIT. A PCN-node could either use separate > queues, or separate policers and a common queue; the draft > provides some guidance when each is better, but for instance the > latter is preferred when the two traffic classes are carrying the > same type of application with the same jitter requirements. Wasn't the consensus after the BOF that the assumption is that all traffic in a PCN domain is PCN traffic? Because otherwise best-effort traffic can gobble up capacity that becomes available after a termination decision, etc. I'm surprised to see that there is now other traffic sharing the PCN domain. Section 5., paragraph 0: > 5. Detailed Functional architecture I'm holding off commenting on section 5 until we've discussed the comments I making now. (Because section 5 is a different view on the same problem, many of the comments made for the other sections apply there as well.) Section 6., paragraph 2: > I-D.chan-pcn-problem-statement [10] considers the following as key > design goals, ie why PCN is interesting: The requirements of [10] are not in line with the charter anymore. Section 6., paragraph 4: > o Compatibility with other traffic (i.e. a proposed solution should > work well when non-PCN traffic is also present in the network) BOF consensus was to declare this out-of-scope. Section 7., paragraph 0: > 7. Deployment scenarios Please clearly mark which of these scenarios are outside the scope of the initial charter. I'm OK with giving them as examples of what PCN ideally/eventually could support, but the focus should be on scenarios that can be realized under the initial charter. 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charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0984663922==-- From pcn-bounces@ietf.org Thu Jul 05 04:41:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6Mtl-000429-A6; Thu, 05 Jul 2007 04:41:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I6Mtj-000424-Ss for pcn-confirm+ok@megatron.ietf.org; Thu, 05 Jul 2007 04:41:11 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6Mtg-00041t-Cz for pcn@ietf.org; Thu, 05 Jul 2007 04:41:08 -0400 Received: from tcmail31.telekom.de ([217.6.95.238]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I6Mtb-00017t-Mi for pcn@ietf.org; Thu, 05 Jul 2007 04:41:08 -0400 Received: from s4de8psaans.mitte.t-com.de by tcmail31.telekom.de with ESMTP; Thu, 5 Jul 2007 10:41:00 +0200 Received: from S4DE8PSAAFQ.mitte.t-com.de ([10.151.180.5]) by s4de8psaans.mitte.t-com.de with Microsoft SMTPSVC(6.0.3790.3959); Thu, 5 Jul 2007 10:40:58 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Thu, 5 Jul 2007 10:40:59 +0200 Message-Id: <6439282641581441A36F7F6F83ED2ED201DB98C8@S4DE8PSAAFQ.mitte.t-com.de> In-Reply-To: <0172B5B5-3540-4ABF-A341-0DD4C20B8AF5@nokia.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: Ace+UB9LDYZkBUgIQZeaH4XKNXq2dQAgPU3A From: "Geib, Ruediger" To: X-OriginalArrivalTime: 05 Jul 2007 08:40:58.0163 (UTC) FILETIME=[356CE830:01C7BEE0] X-Spam-Score: 0.0 (/) X-Scan-Signature: 311e798ce51dbeacf5cdfcc8e9fda21b Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Lars, my remarks in line. Regards, Ruediger. Section 1., paragraph 2: > Each link of the PCN- > domain can be associated with a configured-admissible-rate and a > configured-termination-rate. If PCN-traffic, that is traffic in the > DiffServ class(es) subject to the PCN mechanisms, on the link exceeds > these rates then PCN-packets are admission-marked or termination- > marked. This paragraph and the related text in the remainder of the document imply some particular technical directions: (1) marking is done based on pre-configured rates, rather than, for example, queue dynamics, and (2) there are two kinds of explicit markings (admission/termination), rather than, for example, basing the admission/termination decision on the arrival dynamic changes of a single marking over a sampling interval. Was this a deliberate choice of the authors? [RG] (1) I'm no expert on the mechanisms, but I prefer settable rates=20 to allow traffic engineering. As far as I know rate limited queues are one=20 solution option. [RG] (2) There's no decision yet on the marking mechanism. Claryfying=20 the marking options and the possible interpretations of the markings is a=20 reasonable aim. Section 2., paragraph 0: > 2. Terminology I'd be good to reuse or extend the definitions in RFC2475. [RG] That has been partially done, but I'll extend that to all terms. Section 4., paragraph 1: > After completion of the initial phase, the PCN WG may re-charter to > consider applying the PCN mechanisms to additional deployment > scenarios (operation over concatenated DiffServ domains, PCN-aware > application mechanisms, etc.). The WG may also re-charter to develop > solutions for scenarios where some of these restrictions are not in > place. For example, the WG might consider other response mechanisms > that act on (pre-)congestion information, for example flow-rate > adaptation by elastic applications (rather than flow admission or > termination); and the WG might consider operating PCN over > concatenated PCN-domains that don't trust each other, using re-ECN, > I-D.briscoe-tsvwg-re-ecn-border-cheat [8] or similar techniques. The > details of these work items are outside the scope of the initial > phase, but the WG may consider their requirements in order to design > components that are sufficiently general to support such extensions > in the future - the working assumption is that the standards > developed in the initial phase should not need to be modified to > satisfy the solutions for when these restrictions are removed. The architecture document is not the place to discuss what the WG may do in the future, especially because the text above subtly differs from the charter. Suggest to cut this part. [RG] Could the architecture repeat the "out of scope declarations" =20 of the charter? Section 4., paragraph 3: > o PCN-boundary-nodes at the edge of the PCN-domain, which=20 > admission of new PCN-flows and termination of existing PCN-flows, > based on information from PCN-interior-node. This information is > in the form of the PCN-marked data packets and not signalling > messages. PCN-ingress-nodes are flow-aware (required for policing > purposes) In several deployment scenarios PCN-egress-nodes will > also be flow aware. For example I-D.briscoe-tsvwg-cl-architecture > [2]describes a deployment scenario where RSVP messages are > processed at both the PCN-ingress-node and PCN-egress-node (but > not at any PCN-interior-nodes), and both store associated per flow > state. If "some deployment scenarios" that the architecture is supposed to support require per flow-state on other nodes that the PCN-ingress-nodes, then that means that the architecture as a whole must support that. Because ingress nodes will usually also be egress nodes, and vice versa, that isn't actually a large change, but making this explicit is good IMO. [RG] I agree. Section 4., paragraph 12: > At a high level, flow termination control works as follows. Each > PCN-node termination-marks PCN-packets in a similar fashion to above. > An obvious approach is for the algorithm to use instead a configured- > termination-rate (which is higher than the configured-admissible- > rate) and the encoding to use another packet marking; however there > is also a proposal to use the same configured-admissible-rate and the > same encoding. Several approaches have been proposed to date about > how to convert this information into a flow termination decision; at > a high level these are as follows: OK, this makes it clear that the details of the marking aren't fixed yet (see my first comment.) Suggest to rephrase the text that talks about two types of markings through the document. Section 4., paragraph 20: > but for example I-D.lefaucheur-rsvp-ecn [9]describes the extensions > needed for RSVP. draft-lefaucheur-rsvp-ecn doesn't exist in the tracker? Section 4., paragraph 21: > The following are some high-level points about how PCN works: > > o There needs to be a way for a PCN-node to distinguish PCN-traffic > from non PCN-traffic. This is based on the DSCP field and/or ECN > field. The PCN mechanisms may be applied to more than one traffic > class (which are distinguished by DSCP). > > o There may be traffic that is more important than PCN, perhaps a > particular application or an operator's control messages. A PCN- > node may dedicate capacity to such traffic or priority schedule it > over PCN. In the latter case its traffic needs to contribute to > the PCN meters. > > o There will be traffic less important than PCN. For instance best > effort or assured forwarding traffic (assuming PCN is being > applied to the Expedited forwarding class). It will be scheduled > at lower priority than PCN, and use a separate queue or queues. > However, a PCN-node may dedicate some capacity to lower priority > traffic so that it isn't starved. > > o There may be other traffic with the same priority as PCN-traffic. > For instance, Expedited Forwarding sessions that are originated > either without capacity admission or with traffic engineering, and > EF sessions that are originated using PCN admission control. In > I-D.ietf-tsvwg-admitted-realtime-dscp [5] the two traffic classes > are called EF and EF-ADMIT. A PCN-node could either use separate > queues, or separate policers and a common queue; the draft > provides some guidance when each is better, but for instance the > latter is preferred when the two traffic classes are carrying the > same type of application with the same jitter requirements. Wasn't the consensus after the BOF that the assumption is that all traffic in a PCN domain is PCN traffic? Because otherwise best-effort traffic can gobble up capacity that becomes available after a termination decision, etc. I'm surprised to see that there is now other traffic sharing the PCN domain. [RG] I don't think that the only traffic within a PCN domain is PCN=20 traffic. Best Effort traffic should be present due to economic reasons.=20 Let's say provisioning and engineering result in PCN traffic to be=20 transported free of losses also after a single link loss, then=20 approxinately 50% of the network capacity aren't used for PCN under=20 normal conditions. The remaining 50% could and should e.g. be used=20 for Best Effort. DiffServ is deployed within commercial backbones, so I think it is=20 also reasonable to expect other DiffServ classes to be present.=20 Extending this argument to "DiffServ is also operated to transport=20 inealastic real time traffic", you end up in a situation, where=20 PCN even can't claim a dedicated queue. Migration to PCN probably=20 requires to deal with non PCN traffic sharing the same queue.=20 That's not nice, but that's how it is. [RG] Only if you build a real time transport plattform from scratch or=20 as you describe, a separate network, then a PCN domain will be=20 completely isolated. Section 5., paragraph 0: > 5. Detailed Functional architecture I'm holding off commenting on section 5 until we've discussed the comments I making now. (Because section 5 is a different view on the same problem, many of the comments made for the other sections apply there as well.) Section 6., paragraph 2: > I-D.chan-pcn-problem-statement [10] considers the following as key > design goals, ie why PCN is interesting: The requirements of [10] are not in line with the charter anymore. Section 6., paragraph 4: > o Compatibility with other traffic (i.e. a proposed solution should > work well when non-PCN traffic is also present in the network) BOF consensus was to declare this out-of-scope. [RG] I'm sorry, but when did the BOF or the mailing list discuss or=20 decide this? Section 7., paragraph 0: > 7. Deployment scenarios Please clearly mark which of these scenarios are outside the scope of the initial charter. I'm OK with giving them as examples of what PCN ideally/eventually could support, but the focus should be on scenarios that can be realized under the initial charter. [RG] I agree. Setting up a separate list or having two sub chapters=20 "within scope" and "out of scope" may be reasonable. _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 05 16:14:17 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6XiT-0005Hc-4A; Thu, 05 Jul 2007 16:14:17 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I6XiR-0005HJ-Q0 for pcn-confirm+ok@megatron.ietf.org; Thu, 05 Jul 2007 16:14:15 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6XiR-0005Gs-9t for pcn@ietf.org; Thu, 05 Jul 2007 16:14:15 -0400 Received: from zcars04f.nortel.com ([47.129.242.57]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I6XiQ-0003X4-Uz for pcn@ietf.org; Thu, 05 Jul 2007 16:14:15 -0400 Received: from zrtphxm1.corp.nortel.com (zrtphxm1.corp.nortel.com [47.140.202.50]) by zcars04f.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l65KDJj17838 for ; Thu, 5 Jul 2007 20:13:20 GMT Received: from KCHAN-2K3.nortel.com ([47.16.54.136] RDNS failed) by zrtphxm1.corp.nortel.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 5 Jul 2007 16:13:04 -0400 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Thu, 05 Jul 2007 16:13:02 -0400 To: pcn@ietf.org From: "Kwok-Ho Chan" Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Message-ID: X-OriginalArrivalTime: 05 Jul 2007 20:13:04.0249 (UTC) FILETIME=[E4E6C690:01C7BF40] X-Spam-Score: 0.0 (/) X-Scan-Signature: ff03b0075c3fc728d7d60a15b4ee1ad2 Subject: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org PCN WG: I would like to bring to your attention the availability of the initial version of PCN Encoding Comparison draft. Please review and comment. And discuss on the PCN list. Thank you very much and looking forward to your comments. -- Kwok and Georgios -- >To: i-d-announce@ietf.org >Cc: >From: Internet-Drafts@ietf.org >Date: Thu, 05 Jul 2007 13:15:02 -0400 >X-Scan-Signature: 14582b0692e7f70ce7111d04db3781c8 >Subject: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt >X-BeenThere: i-d-announce@ietf.org >X-Mailman-Version: 2.1.5 >Reply-To: internet-drafts@ietf.org >List-Id: i-d-announce.ietf.org >List-Unsubscribe: , > >List-Archive: >List-Post: >List-Help: >List-Subscribe: , > >X-Spam-Score: 2.3 >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on ecarhea1.nortel.com >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=1 >X-DNSBL-Score: -50 >X-DNSBL-Servers: bl.nortel.com >X-SMTP-HELO: megatron.ietf.org >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >X-SMTP-RCPT-TO: >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel.com,babiarz@nortel.com,aceler@nortel.com,simmonds@nortel.com,huiwc@nortel.com,amuhanna@nortel.com,gparsons@nortel.com,mchen@nortel.com,khchan@nortel.com >X-SMTP-PEER-INFO: megatron.ietf.ORG [156.154.16.145] >X-SMTP-REASON: PASSED >X-SMTP-ID: 1183656101.14019435 >X-OriginalArrivalTime: 05 Jul 2007 17:21:42.0459 (UTC) >FILETIME=[F47A20B0:01C7BF28] > >A New Internet-Draft is available from the on-line Internet-Drafts >directories. > > > Title : Pre-Congestion Notification Encoding Comparison > Author(s) : K. Chan, G. Karagiannis > Filename : draft-chan-pcn-encoding-comparison-00.txt > Pages : 36 > Date : 2007-7-5 > > DiffServ mechanisms have been developed to support Quality of Service > (QoS). However, the level of assurance that can be provided with > DiffServ without substantial over-provisioning is limited. Pre- > Congestion Notification (PCN) investigates the use of per-flow > admission control to provide the required service guarantees for the > admitted traffic. While admission control will protect the QoS under > normal operating conditions, an additional flow termination > mechanism is necessary in the times of heavy congestion (e.g. caused by route > changes due to link or node failure). > > Encoding and their transport are required to carry the congestion and > pre-congestion information from the congestion and pre-congestion > points to the decision points. This document provides a survey of > several encoding methods, using comparisons amongst them as a way to > explain their strengths and weaknesses. > > > >A URL for this Internet-Draft is: >http://www.ietf.org/internet-drafts/draft-chan-pcn-encoding-comparison-00.txt > >To remove yourself from the I-D Announcement list, send a message to >i-d-announce-request@ietf.org with the word unsubscribe in the body of >the message. >You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce >to change your subscription settings. > >Internet-Drafts are also available by anonymous FTP. Login with the >username "anonymous" and a password of your e-mail address. After >logging in, type "cd internet-drafts" and then >"get draft-chan-pcn-encoding-comparison-00.txt". > >A list of Internet-Drafts directories can be found in >http://www.ietf.org/shadow.html >or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > >Internet-Drafts can also be obtained by e-mail. > >Send a message to: > mailserv@ietf.org. >In the body type: > "FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt". > >NOTE: The mail server at ietf.org can return the document in > MIME-encoded form by using the "mpack" utility. To use this > feature, insert the command "ENCODING mime" before the "FILE" > command. To decode the response(s), you will need "munpack" or > a MIME-compliant mail reader. Different MIME-compliant mail readers > exhibit different behavior, especially when dealing with > "multipart" MIME messages (i.e. documents which have been split > up into multiple messages), so check your local documentation on > how to manipulate these messages. > >Below is the data which will enable a MIME compliant mail reader >implementation to automatically retrieve the ASCII version of the >Internet-Draft. > >Content-Type: text/plain >Content-ID: <2007-7-5125842.I-D@ietf.org> > >ENCODING mime >FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt > > > >_______________________________________________ >I-D-Announce mailing list >I-D-Announce@ietf.org >https://www1.ietf.org/mailman/listinfo/i-d-announce _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 05 18:04:44 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6ZRM-0006Sr-MM; Thu, 05 Jul 2007 18:04:44 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I6ZRK-0006PD-U8 for pcn-confirm+ok@megatron.ietf.org; Thu, 05 Jul 2007 18:04:42 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6ZRK-0006P2-Jx for pcn@ietf.org; Thu, 05 Jul 2007 18:04:42 -0400 Received: from imr2.ericy.com ([198.24.6.3]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I6ZRG-0003iT-3W for pcn@ietf.org; Thu, 05 Jul 2007 18:04:42 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr2.ericy.com (8.13.1/8.13.1) with ESMTP id l65M6sO1018414; Thu, 5 Jul 2007 17:06:54 -0500 Received: from eusrcmw750.eamcs.ericsson.se ([138.85.77.50]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Thu, 5 Jul 2007 17:04:37 -0500 Received: from [147.117.169.165] ([147.117.169.165]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Thu, 5 Jul 2007 17:04:36 -0500 Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt From: Steven Blake To: Lars Eggert In-Reply-To: <0172B5B5-3540-4ABF-A341-0DD4C20B8AF5@nokia.com> References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.domain1.systemhost.net> <0172B5B5-3540-4ABF-A341-0DD4C20B8AF5@nokia.com> Content-Type: text/plain Organization: Ericsson IP Infrastructure Date: Thu, 05 Jul 2007 18:04:36 -0400 Message-Id: <1183673076.3274.47.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 05 Jul 2007 22:04:36.0950 (UTC) FILETIME=[7A0FE760:01C7BF50] X-Spam-Score: 0.1 (/) X-Scan-Signature: 25620135586de10c627e3628c432b04a Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org On Wed, 2007-07-04 at 18:29 +0300, Lars Eggert wrote: > Section 4., paragraph 21: > > The following are some high-level points about how PCN works: > > > > o There needs to be a way for a PCN-node to distinguish PCN- > traffic > > from non PCN-traffic. This is based on the DSCP field and/ > or ECN > > field. The PCN mechanisms may be applied to more than one > traffic > > class (which are distinguished by DSCP). > > > > o There may be traffic that is more important than PCN, perhaps a > > particular application or an operator's control messages. A > PCN- > > node may dedicate capacity to such traffic or priority > schedule it > > over PCN. In the latter case its traffic needs to > contribute to > > the PCN meters. > > > > o There will be traffic less important than PCN. For instance > best > > effort or assured forwarding traffic (assuming PCN is being > > applied to the Expedited forwarding class). It will be > scheduled > > at lower priority than PCN, and use a separate queue or queues. > > However, a PCN-node may dedicate some capacity to lower > priority > > traffic so that it isn't starved. > > > > o There may be other traffic with the same priority as PCN- > traffic. > > For instance, Expedited Forwarding sessions that are originated > > either without capacity admission or with traffic > engineering, and > > EF sessions that are originated using PCN admission > control. In > > I-D.ietf-tsvwg-admitted-realtime-dscp [5] the two traffic > classes > > are called EF and EF-ADMIT. A PCN-node could either use > separate > > queues, or separate policers and a common queue; the draft > > provides some guidance when each is better, but for instance > the > > latter is preferred when the two traffic classes are > carrying the > > same type of application with the same jitter requirements. > > Wasn't the consensus after the BOF that the assumption is that all > traffic in a PCN domain is PCN traffic? Because otherwise best-effort > traffic can gobble up capacity that becomes available after a > termination decision, etc. I'm surprised to see that there is now > other traffic sharing the PCN domain. I was not involved with the BOF, but by my reading of charter, I don't see anything implying such a restriction; and it is certainly a whopper of a restriction! Dedicating one (or more) DS behavior aggregate(s) for PCN-managed traffic makes perfect sense, but assuming that either AF or EF PHBs are used to service the PCN-managed BA, that BA will have a guaranteed minimal service rate at each router link that will protect the BA service from variations in best-effort traffic load. Regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 05 22:20:14 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6dQX-0003MC-RN; Thu, 05 Jul 2007 22:20:09 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I6dQW-0003Jb-WC for pcn-confirm+ok@megatron.ietf.org; Thu, 05 Jul 2007 22:20:09 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I6dQV-0003IF-HP for pcn@ietf.org; Thu, 05 Jul 2007 22:20:08 -0400 Received: from zcars04e.nortel.com ([47.129.242.56]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I6dQR-0000JC-1i for pcn@ietf.org; Thu, 05 Jul 2007 22:20:07 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zcars04e.nortel.com (Switch-2.2.0/Switch-2.2.0) with ESMTP id l662ITQ08315; Fri, 6 Jul 2007 02:18:29 GMT X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Thu, 5 Jul 2007 22:19:56 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB6465112107E1@zcarhxm1.corp.nortel.com> In-Reply-To: <0172B5B5-3540-4ABF-A341-0DD4C20B8AF5@nokia.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: Ace+UGOqaTHZZIiRR0CY+hhR47nsHABHWPKA From: "Jozef Babiarz" To: "Lars Eggert" , X-Spam-Score: 0.0 (/) X-Scan-Signature: dd7e0c3fd18d19cffdd4de99a114001d Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org On Wed, 2007-07-04 at 18:29 +0300, Lars Eggert wrote: >Section 1., paragraph 2: >> Each link of the PCN- >> domain can be associated with a configured-admissible-rate and a >> configured-termination-rate. If PCN-traffic, that is traffic =20 in the >> DiffServ class(es) subject to the PCN mechanisms, on the link =20 exceeds >> these rates then PCN-packets are admission-marked or termination- >> marked. > This paragraph and the related text in the remainder of the document > imply some particular technical directions: (1) marking is done based > on pre-configured rates, rather than, for example, queue dynamics, =20 [Joe]Yes. The detection of PCN traffic level is done using some form of a rate measurement or rate compression. PCN deals with inelastic traffic and the rate measurement approach seams to work. I'm interpreting that by queue dynamics you mean something like what is used in AQM?=20 >Wasn't the consensus after the BOF that the assumption is that all > traffic in a PCN domain is PCN traffic? Because otherwise best-effort > traffic can gobble up capacity that becomes available after a > termination decision, etc. I'm surprised to see that there is now > other traffic sharing the PCN domain. [Joe]My understanding is that PCN is applied to a Diffserv domain and one or more service classes may support the PCN mechanism. There maybe service classes that do not support PCN, e.g., best-effort, etc. PCN is only applied to inelastic traffic like voice and video. =20 Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Lars Eggert [mailto:lars.eggert@nokia.com]=20 Sent: July 4, 2007 11:29 AM To: pcn@ietf.org Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Hi, I briefly read over this document. I think it generally goes into the =20 right direction and is very complete for a -00 draft - nice job. I do have some comments, however: Section 1., paragraph 2: > Each link of the PCN- > domain can be associated with a configured-admissible-rate and a > configured-termination-rate. If PCN-traffic, that is traffic =20 in the > DiffServ class(es) subject to the PCN mechanisms, on the link =20 exceeds > these rates then PCN-packets are admission-marked or termination- > marked. This paragraph and the related text in the remainder of the document imply some particular technical directions: (1) marking is done based on pre-configured rates, rather than, for example, queue dynamics, =20 and (2) there are two kinds of explicit markings (admission/termination), rather than, for example, basing the admission/termination =20 decision on the arrival dynamic changes of a single marking over a sampling interval. Was this a deliberate choice of the authors? Section 2., paragraph 0: > 2. Terminology I'd be good to reuse or extend the definitions in RFC2475. Section 4., paragraph 1: > After completion of the initial phase, the PCN WG may re-=20 charter to > consider applying the PCN mechanisms to additional deployment > scenarios (operation over concatenated DiffServ domains, PCN-aware > application mechanisms, etc.). The WG may also re-charter to =20 develop > solutions for scenarios where some of these restrictions are =20 not in > place. For example, the WG might consider other response =20 mechanisms > that act on (pre-)congestion information, for example flow-rate > adaptation by elastic applications (rather than flow admission or > termination); and the WG might consider operating PCN over > concatenated PCN-domains that don't trust each other, using re-=20 ECN, > I-D.briscoe-tsvwg-re-ecn-border-cheat [8] or similar =20 techniques. The > details of these work items are outside the scope of the initial > phase, but the WG may consider their requirements in order to =20 design > components that are sufficiently general to support such =20 extensions > in the future - the working assumption is that the standards > developed in the initial phase should not need to be modified to > satisfy the solutions for when these restrictions are removed. The architecture document is not the place to discuss what the WG may do in the future, especially because the text above subtly differs from the charter. Suggest to cut this part. Section 4., paragraph 3: > o PCN-boundary-nodes at the edge of the PCN-domain, which control > admission of new PCN-flows and termination of existing PCN-=20 flows, > based on information from PCN-interior-node. This =20 information is > in the form of the PCN-marked data packets and not signalling > messages. PCN-ingress-nodes are flow-aware (required for =20 policing > purposes) In several deployment scenarios PCN-egress-nodes will > also be flow aware. For example I-D.briscoe-tsvwg-cl-=20 architecture > [2]describes a deployment scenario where RSVP messages are > processed at both the PCN-ingress-node and PCN-egress-node (but > not at any PCN-interior-nodes), and both store associated =20 per flow > state. If "some deployment scenarios" that the architecture is supposed to support require per flow-state on other nodes that the PCN-ingress-nodes, then that means that the architecture as a whole must support that. Because ingress nodes will usually also be egress nodes, and vice versa, that isn't actually a large change, but making this explicit is good IMO. Section 4., paragraph 12: > At a high level, flow termination control works as follows. Each > PCN-node termination-marks PCN-packets in a similar fashion to =20 above. > An obvious approach is for the algorithm to use instead a =20 configured- > termination-rate (which is higher than the configured-admissible- > rate) and the encoding to use another packet marking; however =20 there > is also a proposal to use the same configured-admissible-rate =20 and the > same encoding. Several approaches have been proposed to date =20 about > how to convert this information into a flow termination =20 decision; at > a high level these are as follows: OK, this makes it clear that the details of the marking aren't fixed yet (see my first comment.) Suggest to rephrase the text that talks about two types of markings through the document. Section 4., paragraph 20: > but for example I-D.lefaucheur-rsvp-ecn [9]describes the =20 extensions > needed for RSVP. draft-lefaucheur-rsvp-ecn doesn't exist in the tracker? Section 4., paragraph 21: > The following are some high-level points about how PCN works: > > o There needs to be a way for a PCN-node to distinguish PCN-=20 traffic > from non PCN-traffic. This is based on the DSCP field and/=20 or ECN > field. The PCN mechanisms may be applied to more than one =20 traffic > class (which are distinguished by DSCP). > > o There may be traffic that is more important than PCN, perhaps a > particular application or an operator's control messages. A =20 PCN- > node may dedicate capacity to such traffic or priority =20 schedule it > over PCN. In the latter case its traffic needs to =20 contribute to > the PCN meters. > > o There will be traffic less important than PCN. For instance =20 best > effort or assured forwarding traffic (assuming PCN is being > applied to the Expedited forwarding class). It will be =20 scheduled > at lower priority than PCN, and use a separate queue or queues. > However, a PCN-node may dedicate some capacity to lower =20 priority > traffic so that it isn't starved. > > o There may be other traffic with the same priority as PCN-=20 traffic. > For instance, Expedited Forwarding sessions that are originated > either without capacity admission or with traffic =20 engineering, and > EF sessions that are originated using PCN admission =20 control. In > I-D.ietf-tsvwg-admitted-realtime-dscp [5] the two traffic =20 classes > are called EF and EF-ADMIT. A PCN-node could either use =20 separate > queues, or separate policers and a common queue; the draft > provides some guidance when each is better, but for instance =20 the > latter is preferred when the two traffic classes are =20 carrying the > same type of application with the same jitter requirements. Wasn't the consensus after the BOF that the assumption is that all traffic in a PCN domain is PCN traffic? Because otherwise best-effort traffic can gobble up capacity that becomes available after a termination decision, etc. I'm surprised to see that there is now other traffic sharing the PCN domain. Section 5., paragraph 0: > 5. Detailed Functional architecture I'm holding off commenting on section 5 until we've discussed the comments I making now. (Because section 5 is a different view on the same problem, many of the comments made for the other sections apply there as well.) Section 6., paragraph 2: > I-D.chan-pcn-problem-statement [10] considers the following as key > design goals, ie why PCN is interesting: The requirements of [10] are not in line with the charter anymore. Section 6., paragraph 4: > o Compatibility with other traffic (i.e. a proposed solution =20 should > work well when non-PCN traffic is also present in the network) BOF consensus was to declare this out-of-scope. Section 7., paragraph 0: > 7. Deployment scenarios Please clearly mark which of these scenarios are outside the scope of the initial charter. I'm OK with giving them as examples of what PCN ideally/eventually could support, but the focus should be on =20 scenarios that can be realized under the initial charter. Lars _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 09 07:22:22 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I7rJt-0001TT-Fo; Mon, 09 Jul 2007 07:22:21 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I7rJt-0001T8-1A for pcn-confirm+ok@megatron.ietf.org; Mon, 09 Jul 2007 07:22:21 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I7rJs-0001T0-Ky for pcn@ietf.org; Mon, 09 Jul 2007 07:22:20 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I7rJo-00048C-VW for pcn@ietf.org; Mon, 09 Jul 2007 07:22:20 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 9 Jul 2007 12:22:08 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Mon, 9 Jul 2007 12:22:07 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2ED@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <468B46E7.3060102@informatik.uni-wuerzburg.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: Ace+CitZhMyTQjOGT8ufRNzAmtuWQgEDVVng From: To: X-OriginalArrivalTime: 09 Jul 2007 11:22:08.0413 (UTC) FILETIME=[62FEF4D0:01C7C21B] X-Spam-Score: 0.0 (/) X-Scan-Signature: 69aba9e925a1047819f53b40fa4fc4e6 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Michael - thanks! In-line below phil > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] > Sent: 04 July 2007 08:06 > To: Eardley,PL,Philip,CXR9 R > Cc: pcn@ietf.org > Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >=20 > Hi Phil et al., >=20 > after another reading of the PCN architecture draft > http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.tx t > here are some comments. >=20 > 1. Intro: >=20 > o The configured-admissible-rates can be chosen small enough that > admitted traffic can still be carried after a rerouting in most failure > cases. This is an important feature as QoS violations in core networks > due to link failures are more likely than QoS violations due to > increased traffic volume. >=20 > appropriate citation: > http://www.ieee-infocom.org/2003/papers/10_04.PDF >=20 > some history: see Section III of > http://www3.informatik.uni-wuerzburg.de/~menth/Publications/Menth07-PCN- > Config.pdf ok >=20 > 2. Terminology: >=20 > I would like to have discussed also the nomenclature in the Three State > PCN Marking draft: > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt let the discussion begin! >=20 > 3. Assumptions: >=20 > Should headlines be uppercase or lowercase (cf. 3., 3.1, 3.2, ...)? >=20 > Is only a single PCN in the scope of the current charter or several PCN > classes with different scheduling priority? We had some discussion on > this earlier. This issue also relates to the bullet list at the end of > Section 4. My view is that both are possible.=20 >=20 >=20 > 4. High-level functional architecture >=20 > I think it makes sense to define the term "pre-congestion": a link with > capacity C is pre-congested with regard to a rate threshold R current traffic rate is above R. This applies both to the > configurable-admission-rate and configurable-termination-rate > thresholds, i.e., there are different types of pre-congestion. We > introduced this notion in Section 2 of the "Three State PCN Marking" > draft: > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt would this definition also catch ECN (which 3168 considers congestion, rather than pre-congestion)? >=20 >=20 > 5. Detailed Functional architecture >=20 > Comment to probing: probe packets need to have the same header as data > packet, otherwise might be transported over different paths when ECMP is > on and flow-based load distribution is based on hash values of the > packet headers. Then, my next question is: how does the PCN egress node > recognize a probe packet as a such? I think that this is a fundamental > problem which requires a standardized solution that is essential to a > signalling draft. Therefore, it might be worth mentioning. Including a discussion about this somewhere seems good. I don't think we've properly discussed what the requirements on probing are. Eg I'm not sure the egress node necessarily has to recognise a probe pkt - the crucial thing is that enough traffic is generated on the ingress-egress-aggregate to make the adm decision.=20 Perhaps we should start a separate discussion about probing.=20 >=20 > Regards, >=20 > Michael >=20 > philip.eardley@bt.com wrote: > > Hi all, > > > > Just a reminder that all comments on this draft would be great. It aims > > to describe the PCN architecture, in light of the PCN WG's Charter & its > > Milestone of an Info doc on 'Flow Admission and Termination Architecture > > within a Diffserv Domain' (due Nov 07). > > > > S1 Introduction. > > This is quite short. If desired, it could be boosted with a general > > explanation of where PCN fits into the picture of QoS and how it's > > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) > > > > S2 Terminology > > In the "Editor's note" are 3 alternative terms that some of the authors > > preferred. > > > > S3 Assumptions and constraints on scope > > These are the 4 things mentioned in the Charter, plus some explanation > > of them. Are they clear? Also we mention some of the ways that a future > > revised Charter might look at overcoming some of the > > constraints/assumptions; is this sub-section at the right depth? > > > > S4 High-level functional architecture > > We have tried to write this section (and the following ones) so that it > > fits all the various proposals there've been for PCN mechanisms. Does > > this make the section too wishy-washy or too hard to understand? Should > > it include some comparison of the different mechanisms proposed > > (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? > > > > S5 Detailed Functional architecture > > Is this a reasonable description of the extra functionality that PCN > > requires on various nodes in the PCN-domain? Is it the right way to > > split up the description? For clarity / help reader's understanding, > > should there be some specific examples of how functionality might be > > distributed (eg "if you followed the deployment model in > > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made at > > the PCN-egress-node, communicated to the PCN-ingress-nodes which makes > > the admission decision; etc.") > > > > S6 Design goals and challenges > > This briefly describes some open issues, taken from > > briscoe-tsvwg-cl-architecture. Are there other ones that should be > > mentioned? Is the problem description at the right level of depth? > > Should we discuss various possible solutions to these problems? > > > > S7 Deployment scenarios > > Briefly describes some deployment scenarios for pcn? is this at the > > right level of depth? > > > > S8 Operations and Management > > This section was written in response to the Charter saying that the > > architecture document should include security, manageability and > > operational considerations. The draft addresses this by providing some > > thoughts under the FCAPS headings: OAM of Faults, Configuration, > > Accounting, Performance and Security? Is this the right way of > > structuring it - does it cover the right set of topics? Is the text at > > the right level? - eg should it also have a detailed set of parameters > > that would be available for configuration? > > > > An overall question is whether the draft should have more comparison of > > the options (pros/cons) for various aspects. > > > > I aim to edit another version of the draft before the ietf (but maybe > > not before the deadline as I'm on hols next week). > > > > Thanks! > > Phil/ > > > > > > > >> -----Original Message----- > >> From: Kwok-Ho Chan [mailto:khchan@nortel.com] > >> Sent: 22 June 2007 04:38 > >> To: pcn@ietf.org > >> Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > >> > >> Hi all: > >> Please see the attached E-Mail on the posting of the PCN Architecture > >> draft. > >> On behave of the editor of this draft: Phil, and the co-authors of > >> > > this > > > >> draft, > >> we would like to request for reviews and comments of this draft and > >> welcome > >> any comments for improvements. > >> > >> Please send your comments/discussions of this draft on the PCN list. > >> > >> Thank you for your interest and review of this draft! > >> -- Kwok on behave of the co-authors of this draft -- > >> > >> > >> > >>> To: i-d-announce@ietf.org > >>> Cc: > >>> From: Internet-Drafts@ietf.org > >>> Date: Thu, 21 Jun 2007 15:50:02 -0400 > >>> X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 > >>> Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt > >>> X-BeenThere: i-d-announce@ietf.org > >>> X-Mailman-Version: 2.1.5 > >>> Reply-To: internet-drafts@ietf.org > >>> List-Id: i-d-announce.ietf.org > >>> List-Unsubscribe: > >>> > > , > > > >>> > >>> List-Archive: > >>> List-Post: > >>> List-Help: > >>> List-Subscribe: > >>> > > , > > > >>> > >>> X-Spam-Tests: FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, > >>> NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D4 > >>> X-Spam-Score: 5.3 > >>> X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > >>> > >> ecarhea1.nortel.com > >> > >>> X-DNSBL-Score: -50 > >>> X-DNSBL-Servers: bl.nortel.com > >>> X-SMTP-HELO: megatron.ietf.org > >>> X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > >>> X-SMTP-RCPT-TO: > >>> > >> kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel > >> > > .c > > > > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel > > .c > > > > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c > > om > > > >>> X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] > >>> X-SMTP-REASON: PASSED > >>> X-SMTP-ID: 1182455563.14011407 > >>> X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) > >>> FILETIME=3D[BC4965C0:01C7B43D] > >>> > >>> A New Internet-Draft is available from the on-line Internet-Drafts > >>> directories. > >>> > >>> > >>> Title : Pre-Congestion Notification Architecture > >>> Author(s) : P. Eardley, et al. > >>> Filename : draft-eardley-pcn-architecture-00.txt > >>> Pages : 27 > >>> Date : 2007-6-21 > >>> > >>> The purpose of this document is to describe a general > >>> > > architecture > > > >>> for flow admission and termination based on aggregated (pre-) > >>> congestion information in order to protect the quality of service > >>> > > of > > > >>> established inelastic flows within a single DiffServ domain. > >>> > >>> > >>> A URL for this Internet-Draft is: > >>> > >> http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t > >> > > xt > > > >>> To remove yourself from the I-D Announcement list, send a message to > >>> i-d-announce-request@ietf.org with the word unsubscribe in the body > >>> > > of > > > >>> the message. > >>> You can also visit > >>> > > https://www1.ietf.org/mailman/listinfo/I-D-announce > > > >>> to change your subscription settings. > >>> > >>> Internet-Drafts are also available by anonymous FTP. Login with the > >>> username "anonymous" and a password of your e-mail address. After > >>> logging in, type "cd internet-drafts" and then > >>> "get draft-eardley-pcn-architecture-00.txt". > >>> > >>> A list of Internet-Drafts directories can be found in > >>> http://www.ietf.org/shadow.html > >>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > >>> > >>> Internet-Drafts can also be obtained by e-mail. > >>> > >>> Send a message to: > >>> mailserv@ietf.org. > >>> In the body type: > >>> "FILE > >>> > > /internet-drafts/draft-eardley-pcn-architecture-00.txt". > > > >>> NOTE: The mail server at ietf.org can return the document in > >>> MIME-encoded form by using the "mpack" utility. To use this > >>> feature, insert the command "ENCODING mime" before the > >>> > > "FILE" > > > >>> command. To decode the response(s), you will need "munpack" > >>> > > or > > > >>> a MIME-compliant mail reader. Different MIME-compliant mail > >>> > >> readers > >> > >>> exhibit different behavior, especially when dealing with > >>> "multipart" MIME messages (i.e. documents which have been > >>> > > split > > > >>> up into multiple messages), so check your local > >>> > > documentation on > > > >>> how to manipulate these messages. > >>> > >>> Below is the data which will enable a MIME compliant mail reader > >>> implementation to automatically retrieve the ASCII version of the > >>> Internet-Draft. > >>> > >>> Content-Type: text/plain > >>> Content-ID: <2007-6-21120238.I-D@ietf.org> > >>> > >>> ENCODING mime > >>> FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt > >>> > >>> > >>> >>> > >> 00.txt> > >> > >>> _______________________________________________ > >>> I-D-Announce mailing list > >>> I-D-Announce@ietf.org > >>> https://www1.ietf.org/mailman/listinfo/i-d-announce > >>> > >> _______________________________________________ > >> PCN mailing list > >> PCN@ietf.org > >> https://www1.ietf.org/mailman/listinfo/pcn > >> > > > > > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn > > >=20 > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science > Am Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 09 08:03:40 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I7rxr-0005bV-GW; Mon, 09 Jul 2007 08:03:39 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I7rxj-0005U7-4g for pcn-confirm+ok@megatron.ietf.org; Mon, 09 Jul 2007 08:03:31 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I7rxi-0005S0-B8 for pcn@ietf.org; Mon, 09 Jul 2007 08:03:30 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I7rxh-0005GG-Iv for pcn@ietf.org; Mon, 09 Jul 2007 08:03:30 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 9 Jul 2007 13:03:04 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Mon, 9 Jul 2007 13:03:04 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2F0@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <6439282641581441A36F7F6F83ED2ED201DB98C8@S4DE8PSAAFQ.mitte.t-com.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: Ace+UB9LDYZkBUgIQZeaH4XKNXq2dQAgPU3AANKiGeA= From: To: , X-OriginalArrivalTime: 09 Jul 2007 12:03:04.0857 (UTC) FILETIME=[1B269090:01C7C221] X-Spam-Score: 0.0 (/) X-Scan-Signature: 7c1a129dc3801d79d40c5ca8dee767eb Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Lars, Ruediger Thanks for the comments! In-line below phil > -----Original Message----- > From: Geib, Ruediger [mailto:Ruediger.Geib@t-systems.com] > Sent: 05 July 2007 09:41 > To: lars.eggert@nokia.com > Cc: pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >=20 > Hi Lars, >=20 > my remarks in line. >=20 > Regards, Ruediger. >=20 > Section 1., paragraph 2: > > Each link of the PCN- > > domain can be associated with a configured-admissible-rate and a > > configured-termination-rate. If PCN-traffic, that is traffic in the > > DiffServ class(es) subject to the PCN mechanisms, on the link exceeds > > these rates then PCN-packets are admission-marked or termination- > > marked. >=20 > This paragraph and the related text in the remainder of the document > imply some particular technical directions: (1) marking is done based > on pre-configured rates, rather than, for example, queue dynamics, and > (2) there are two kinds of explicit markings (admission/termination), > rather than, for example, basing the admission/termination decision on > the arrival dynamic changes of a single marking over a sampling > interval. Was this a deliberate choice of the authors? >=20 > [RG] (1) I'm no expert on the mechanisms, but I prefer settable rates > to allow traffic engineering. As far as I know rate limited queues are > one > solution option. >=20 > [RG] (2) There's no decision yet on the marking mechanism. Claryfying > the marking options and the possible interpretations of the markings is > a > reasonable aim. (1) I don't think 'everything but pre-configured rates' is excluded. I think the algorithm will somehow involve a characteristic traffic rate. I presume people who have other ideas about the algorithm should submit a draft or comment on the existing suggestions. There is an open question about how detailed the algorithm spec should be (what is an implementation choice) (2) 2 explicit encodings is not decided. In general I think purely using arrival dynamics to distinguish between adm & termination decision is hard - since you want to react fast to problems (whether adm control or flow termination), but on the other hand it will take some time for a flow termination decision to have an impact on the marks seen at the egress. =20 >=20 > Section 2., paragraph 0: > > 2. Terminology >=20 > I'd be good to reuse or extend the definitions in RFC2475. >=20 > [RG] That has been partially done, but I'll extend that to all terms. Tried to do, obviously not that well. Maybe 2475 terminology experts can advise? >=20 >=20 > Section 4., paragraph 1: > > After completion of the initial phase, the PCN WG may re-charter to > > consider applying the PCN mechanisms to additional deployment > > scenarios (operation over concatenated DiffServ domains, PCN-aware > > application mechanisms, etc.). The WG may also re-charter to develop > > solutions for scenarios where some of these restrictions are not in > > place. For example, the WG might consider other response mechanisms > > that act on (pre-)congestion information, for example flow-rate > > adaptation by elastic applications (rather than flow admission or > > termination); and the WG might consider operating PCN over > > concatenated PCN-domains that don't trust each other, using re-ECN, > > I-D.briscoe-tsvwg-re-ecn-border-cheat [8] or similar techniques. The > > details of these work items are outside the scope of the initial > > phase, but the WG may consider their requirements in order to design > > components that are sufficiently general to support such extensions > > in the future - the working assumption is that the standards > > developed in the initial phase should not need to be modified to > > satisfy the solutions for when these restrictions are removed. >=20 > The architecture document is not the place to discuss what the WG may > do in the future, especially because the text above subtly differs > from the charter. Suggest to cut this part. >=20 > [RG] Could the architecture repeat the "out of scope declarations" > of the charter? Ok, will try again - wasn't trying to say anything different from charter - but thought the draft should mention that the WG should keep the inter-domain requirements (cf border-cheat) "strongly in mind" (I think that was the phrase at the BoF). >=20 > Section 4., paragraph 3: > > o PCN-boundary-nodes at the edge of the PCN-domain, which > > admission of new PCN-flows and termination of existing PCN-flows, > > based on information from PCN-interior-node. This information is > > in the form of the PCN-marked data packets and not signalling > > messages. PCN-ingress-nodes are flow-aware (required for policing > > purposes) In several deployment scenarios PCN-egress-nodes will > > also be flow aware. For example I-D.briscoe-tsvwg-cl-architecture > > [2]describes a deployment scenario where RSVP messages are > > processed at both the PCN-ingress-node and PCN-egress-node (but > > not at any PCN-interior-nodes), and both store associated per flow > > state. >=20 > If "some deployment scenarios" that the architecture is supposed to > support require per flow-state on other nodes that the > PCN-ingress-nodes, then that means that the architecture as a whole > must support that. Because ingress nodes will usually also be egress > nodes, and vice versa, that isn't actually a large change, but making > this explicit is good IMO. >=20 > [RG] I agree. Ok >=20 > Section 4., paragraph 12: > > At a high level, flow termination control works as follows. Each > > PCN-node termination-marks PCN-packets in a similar fashion to above. > > An obvious approach is for the algorithm to use instead a configured- > > termination-rate (which is higher than the configured-admissible- > > rate) and the encoding to use another packet marking; however there > > is also a proposal to use the same configured-admissible-rate and the > > same encoding. Several approaches have been proposed to date about > > how to convert this information into a flow termination decision; at > > a high level these are as follows: >=20 > OK, this makes it clear that the details of the marking aren't fixed > yet (see my first comment.) Suggest to rephrase the text that > talks about two types of markings through the document. Will try for some re-phrasing.=20 >=20 >=20 > Section 4., paragraph 20: > > but for example I-D.lefaucheur-rsvp-ecn [9]describes the extensions > > needed for RSVP. >=20 > draft-lefaucheur-rsvp-ecn doesn't exist in the tracker? It has expired - is it ok still to reference it? >=20 > Section 4., paragraph 21: > > The following are some high-level points about how PCN works: > > > > o There needs to be a way for a PCN-node to distinguish PCN-traffic > > from non PCN-traffic. This is based on the DSCP field and/or ECN > > field. The PCN mechanisms may be applied to more than one traffic > > class (which are distinguished by DSCP). > > > > o There may be traffic that is more important than PCN, perhaps a > > particular application or an operator's control messages. A PCN- > > node may dedicate capacity to such traffic or priority schedule it > > over PCN. In the latter case its traffic needs to contribute to > > the PCN meters. > > > > o There will be traffic less important than PCN. For instance best > > effort or assured forwarding traffic (assuming PCN is being > > applied to the Expedited forwarding class). It will be scheduled > > at lower priority than PCN, and use a separate queue or queues. > > However, a PCN-node may dedicate some capacity to lower priority > > traffic so that it isn't starved. > > > > o There may be other traffic with the same priority as PCN-traffic. > > For instance, Expedited Forwarding sessions that are originated > > either without capacity admission or with traffic engineering, and > > EF sessions that are originated using PCN admission control. In > > I-D.ietf-tsvwg-admitted-realtime-dscp [5] the two traffic classes > > are called EF and EF-ADMIT. A PCN-node could either use separate > > queues, or separate policers and a common queue; the draft > > provides some guidance when each is better, but for instance the > > latter is preferred when the two traffic classes are carrying the > > same type of application with the same jitter requirements. >=20 > Wasn't the consensus after the BOF that the assumption is that all > traffic in a PCN domain is PCN traffic? Because otherwise best-effort > traffic can gobble up capacity that becomes available after a > termination decision, etc. I'm surprised to see that there is now > other traffic sharing the PCN domain. >=20 > [RG] I don't think that the only traffic within a PCN domain is PCN > traffic. Best Effort traffic should be present due to economic reasons. > Let's say provisioning and engineering result in PCN traffic to be > transported free of losses also after a single link loss, then > approxinately 50% of the network capacity aren't used for PCN under > normal conditions. The remaining 50% could and should e.g. be used > for Best Effort. > DiffServ is deployed within commercial backbones, so I think it is > also reasonable to expect other DiffServ classes to be present. > Extending this argument to "DiffServ is also operated to transport > inealastic real time traffic", you end up in a situation, where > PCN even can't claim a dedicated queue. Migration to PCN probably > requires to deal with non PCN traffic sharing the same queue. > That's not nice, but that's how it is. >=20 > [RG] Only if you build a real time transport plattform from scratch or > as you describe, a separate network, then a PCN domain will be > completely isolated. I basically agree with Ruediger. Lars: yes, the BE gobbles up the capacity that becomes available after a termination decision - however it is in a different DS class at lower priority. The bullets in the draft are my attempt to summarise the consensus view. >=20 > Section 5., paragraph 0: > > 5. Detailed Functional architecture >=20 > I'm holding off commenting on section 5 until we've discussed the > comments I making now. (Because section 5 is a different view on the > same problem, many of the comments made for the other sections apply > there as well.) >=20 >=20 > Section 6., paragraph 2: > > I-D.chan-pcn-problem-statement [10] considers the following as key > > design goals, ie why PCN is interesting: >=20 > The requirements of [10] are not in line with the charter anymore. Ok, I'll have a check. >=20 > Section 6., paragraph 4: > > o Compatibility with other traffic (i.e. a proposed solution should > > work well when non-PCN traffic is also present in the network) >=20 > BOF consensus was to declare this out-of-scope. >=20 > [RG] I'm sorry, but when did the BOF or the mailing list discuss or > decide this? >=20 > Section 7., paragraph 0: > > 7. Deployment scenarios >=20 > Please clearly mark which of these scenarios are outside the scope of > the initial charter. I'm OK with giving them as examples of what PCN > ideally/eventually could support, but the focus should be on scenarios > that can be realized under the initial charter. >=20 > [RG] I agree. Setting up a separate list or having two sub chapters > "within scope" and "out of scope" may be reasonable. Ok, will try & re-write.=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 09 08:16:43 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I7sAV-0005WK-11; Mon, 09 Jul 2007 08:16:43 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I7s9v-0005EK-MK for pcn-confirm+ok@megatron.ietf.org; Mon, 09 Jul 2007 08:16:07 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I7s9u-0005E6-Rj for pcn@ietf.org; Mon, 09 Jul 2007 08:16:07 -0400 Received: from smtp2.smtp.bt.com ([217.32.164.150]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I7s9p-0005UL-VT for pcn@ietf.org; Mon, 09 Jul 2007 08:16:06 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 9 Jul 2007 13:16:01 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Mon, 9 Jul 2007 13:16:00 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2F1@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <006f01c7bc5a$724c4cb0$864c460a@china.huawei.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: Ace8WnfDBkvfck24Tiqr3vFZ5RYpBgFx8H/Q From: To: , X-OriginalArrivalTime: 09 Jul 2007 12:16:01.0331 (UTC) FILETIME=[E9F71830:01C7C222] X-Spam-Score: 0.2 (/) X-Scan-Signature: e654cfa5e44bd623be3eb2c720858b05 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Tina Thanks I'm not sure I completely understand your comments, sorry. Is the problem that at the moment the draft only describes the Pull model and not the Push model? Which lines of text need changing? (somewhere in Section 5.4 or section 7 or somewhere else?) Thanks! phil > -----Original Message----- > From: Tina TSOU [mailto:tena@huawei.com] > Sent: 02 July 2007 04:38 > To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R > Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >=20 > Hi all, > One of the scenarios I am suggesting is below. >=20 > Even in Pull mode, application layer QoS request (via RSVP) should be also > sent from ingress to the centralized node, in centralized node the policy > is > generated, then the decision is made, and then delivers to the Ingress to > enforce. I was not saying that the policy is directly generated in the > Ingress. Even the rather that Push mode should be also taken into account. >=20 > I.e. we define the centralized node locates in the transport control > layer; > the Ingress and Egress locate in transport layer. For the implementation > of > physical entities, they are service policy server and PCN-enabled router > respectively. >=20 > The centralized node is policy decision node, it should be based on (1) > Egress measurement result (2) operator's policies (could be configured in > the centralized node) (3) QoS request coming from the application layer > (PUSH or PULL mode), to make the decision, and decide which flows should > be > admitted or reject, which flows should be stopped temperately or > downgraded, > which flows should be done policing. The generated policy should be sent > to > ingress for enforcement. >=20 > Ingress is the policy enforcement point, it based on the policy delivered > by > the centralized node, (1) it allows flow pass or filter flow, (2) for the > flows allowed to pass, it makes policing and coloring based on the policy. >=20 > Referrence: > QoS "Push" Model: model where the centralised node "pushes" traffic > policies > to the transport functions to enforce its policy decisions. > NOTE: In this model, the CPE does not itself support native application > independent QoS procedures. > QoS "Pull" Model: model where, upon request from the transport processing > functions, the centralised node provides traffic policies to the transport > processing functions. The request from the transport processing functions > may itself, for example, be triggered by path-coupled requests coming from > user equipment and/or transport network elements. >=20 >=20 > B. R. > Tina >=20 > ----- Original Message ----- > From: > To: > Sent: Thursday, June 28, 2007 11:59 PM > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >=20 >=20 > Hi all, >=20 > Just a reminder that all comments on this draft would be great. It aims > to describe the PCN architecture, in light of the PCN WG's Charter & its > Milestone of an Info doc on 'Flow Admission and Termination Architecture > within a Diffserv Domain' (due Nov 07). >=20 > S1 Introduction. > This is quite short. If desired, it could be boosted with a general > explanation of where PCN fits into the picture of QoS and how it's > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) >=20 > S2 Terminology > In the "Editor's note" are 3 alternative terms that some of the authors > preferred. >=20 > S3 Assumptions and constraints on scope > These are the 4 things mentioned in the Charter, plus some explanation > of them. Are they clear? Also we mention some of the ways that a future > revised Charter might look at overcoming some of the > constraints/assumptions; is this sub-section at the right depth? >=20 > S4 High-level functional architecture > We have tried to write this section (and the following ones) so that it > fits all the various proposals there've been for PCN mechanisms. Does > this make the section too wishy-washy or too hard to understand? Should > it include some comparison of the different mechanisms proposed > (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? >=20 > S5 Detailed Functional architecture > Is this a reasonable description of the extra functionality that PCN > requires on various nodes in the PCN-domain? Is it the right way to > split up the description? For clarity / help reader's understanding, > should there be some specific examples of how functionality might be > distributed (eg "if you followed the deployment model in > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made at > the PCN-egress-node, communicated to the PCN-ingress-nodes which makes > the admission decision; etc.") >=20 > S6 Design goals and challenges > This briefly describes some open issues, taken from > briscoe-tsvwg-cl-architecture. Are there other ones that should be > mentioned? Is the problem description at the right level of depth? > Should we discuss various possible solutions to these problems? >=20 > S7 Deployment scenarios > Briefly describes some deployment scenarios for pcn? is this at the > right level of depth? >=20 > S8 Operations and Management > This section was written in response to the Charter saying that the > architecture document should include security, manageability and > operational considerations. The draft addresses this by providing some > thoughts under the FCAPS headings: OAM of Faults, Configuration, > Accounting, Performance and Security? Is this the right way of > structuring it - does it cover the right set of topics? Is the text at > the right level? - eg should it also have a detailed set of parameters > that would be available for configuration? >=20 > An overall question is whether the draft should have more comparison of > the options (pros/cons) for various aspects. >=20 > I aim to edit another version of the draft before the ietf (but maybe > not before the deadline as I'm on hols next week). >=20 > Thanks! > Phil/ >=20 >=20 > > -----Original Message----- > > From: Kwok-Ho Chan [mailto:khchan@nortel.com] > > Sent: 22 June 2007 04:38 > > To: pcn@ietf.org > > Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > > Hi all: > > Please see the attached E-Mail on the posting of the PCN Architecture > > draft. > > On behave of the editor of this draft: Phil, and the co-authors of > this > > draft, > > we would like to request for reviews and comments of this draft and > > welcome > > any comments for improvements. > > > > Please send your comments/discussions of this draft on the PCN list. > > > > Thank you for your interest and review of this draft! > > -- Kwok on behave of the co-authors of this draft -- > > > > > > >To: i-d-announce@ietf.org > > >Cc: > > >From: Internet-Drafts@ietf.org > > >Date: Thu, 21 Jun 2007 15:50:02 -0400 > > >X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 > > >Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > >X-BeenThere: i-d-announce@ietf.org > > >X-Mailman-Version: 2.1.5 > > >Reply-To: internet-drafts@ietf.org > > >List-Id: i-d-announce.ietf.org > > >List-Unsubscribe: > , > > > > > >List-Archive: > > >List-Post: > > >List-Help: > > >List-Subscribe: > , > > > > > >X-Spam-Tests: FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, > > > NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D4 > > >X-Spam-Score: 5.3 > > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > > ecarhea1.nortel.com > > >X-DNSBL-Score: -50 > > >X-DNSBL-Servers: bl.nortel.com > > >X-SMTP-HELO: megatron.ietf.org > > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > > >X-SMTP-RCPT-TO: > > > >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel > .c > > > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel > .c > > > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c > om > > >X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] > > >X-SMTP-REASON: PASSED > > >X-SMTP-ID: 1182455563.14011407 > > >X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) > > >FILETIME=3D[BC4965C0:01C7B43D] > > > > > >A New Internet-Draft is available from the on-line Internet-Drafts > > >directories. > > > > > > > > > Title : Pre-Congestion Notification Architecture > > > Author(s) : P. Eardley, et al. > > > Filename : draft-eardley-pcn-architecture-00.txt > > > Pages : 27 > > > Date : 2007-6-21 > > > > > > The purpose of this document is to describe a general > architecture > > > for flow admission and termination based on aggregated (pre-) > > > congestion information in order to protect the quality of service > of > > > established inelastic flows within a single DiffServ domain. > > > > > > > > >A URL for this Internet-Draft is: > > > >http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t > xt > > > > > >To remove yourself from the I-D Announcement list, send a message to > > >i-d-announce-request@ietf.org with the word unsubscribe in the body > of > > >the message. > > >You can also visit > https://www1.ietf.org/mailman/listinfo/I-D-announce > > >to change your subscription settings. > > > > > >Internet-Drafts are also available by anonymous FTP. Login with the > > >username "anonymous" and a password of your e-mail address. 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Different MIME-compliant mail > > readers > > > exhibit different behavior, especially when dealing with > > > "multipart" MIME messages (i.e. documents which have been > split > > > up into multiple messages), so check your local > documentation on > > > how to manipulate these messages. > > > > > >Below is the data which will enable a MIME compliant mail reader > > >implementation to automatically retrieve the ASCII version of the > > >Internet-Draft. > > > > > >Content-Type: text/plain > > >Content-ID: <2007-6-21120238.I-D@ietf.org> > > > > > >ENCODING mime > > >FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt > > > > > > > > > > 00.txt> > > >_______________________________________________ > > >I-D-Announce mailing list > > >I-D-Announce@ietf.org > > >https://www1.ietf.org/mailman/listinfo/i-d-announce > > > > > > > > > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 09 09:33:07 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I7tMO-0000oS-Hx; 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Mon, 9 Jul 2007 13:32:22 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 9 Jul 2007 09:32:15 -0400 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C7C22D.902C570C" Date: Mon, 9 Jul 2007 09:32:11 -0400 Message-ID: X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: Soliciting comments on draft-charny-pcn-single-marking-02 and draft-zhang-performance-evaluation-02 Thread-Index: AcfCIXjq+pVnaRUDQW6gbfn19TbbigACwECg From: "Anna Charny \(acharny\)" To: X-OriginalArrivalTime: 09 Jul 2007 13:32:15.0391 (UTC) FILETIME=[905142F0:01C7C22D] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=498311; t=1183987945; x=1184851945; c=relaxed/simple; s=sjdkim2002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20Soliciting=20comments=20on=20draft-charny-pcn-single-marking- 02=20and=20draft-zhang-performance-evaluation-02 |Sender:=20; bh=M91WsBRKGUopQ6PfUu5x7Rh4v6S9BZpFNTk/0uTaUAI=; b=onQ+4q3HjWTKC0aU0Qq4bX1fZKp3okkqHfHqy/hbQDVNFe33l2ilVj9h512UrI/WrCf0Z1TG QwMyBorffMu6rAQKvhipaMbZ9ThSJng8Z9k61pHkuj60HijERaxZTp/7; Authentication-Results: sj-dkim-2; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/sjdkim2002 verified; ); X-Spam-Score: 2.4 (++) X-Scan-Signature: ad517935c6dfd31fb46f24be0c928033 Subject: [PCN] Soliciting comments on draft-charny-pcn-single-marking-02 and draft-zhang-performance-evaluation-02 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. ------_=_NextPart_001_01C7C22D.902C570C Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Hi all, The attached two drafts have been submitted and are propagating through the servers. =20 Deltas from the previous versions:=20 1) new performance analysis results for virtual-queue-based admission and token-bucket-based preemption schemes (draft-zhang-performance-evaluation) 2) new simulation results for single-marking draft 3) new sections in the draft-charny-single-marking drafts on - impact on the PCN architecture framework=20 - deployment considerations - traffic engineering considerations Please send us you feedback. 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https://www1.ietf.org/mailman/listinfo/pcn ------_=_NextPart_001_01C7C22D.902C570C-- From pcn-bounces@ietf.org Tue Jul 10 02:33:47 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I89I8-0004YN-NQ; Tue, 10 Jul 2007 02:33:44 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I89I7-0004RV-6D for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 02:33:43 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I89I6-0004Oc-2g for pcn@ietf.org; Tue, 10 Jul 2007 02:33:42 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I89I1-0001EA-Bc for pcn@ietf.org; Tue, 10 Jul 2007 02:33:41 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 75B4C701D; Tue, 10 Jul 2007 08:33:34 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 67E727D7A; Tue, 10 Jul 2007 08:33:34 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 46A38701D; Tue, 10 Jul 2007 08:33:34 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6A6XYk29276; Tue, 10 Jul 2007 08:33:34 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id A49E16F58E; Tue, 10 Jul 2007 08:27:57 +0200 (CEST) Message-ID: <469327AA.1070100@informatik.uni-wuerzburg.de> Date: Tue, 10 Jul 2007 08:31:06 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Philip Eardley Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 52e1467c2184c31006318542db5614d5 Cc: pcn@ietf.org Subject: [PCN] Pre-congestion and ECN X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil and others,, > > I think it makes sense to define the term "pre-congestion": a link with > > capacity C is pre-congested with regard to a rate threshold R > current traffic rate is above R. This applies both to the > > configurable-admission-rate and configurable-termination-rate > > thresholds, i.e., there are different types of pre-congestion. We > > introduced this notion in Section 2 of the "Three State PCN Marking" > > draft: > > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt > would this definition also catch ECN (which 3168 considers congestion, rather than pre-congestion)? Congestion observed in real queues by ECN can be seen as a special form of "pre-congestion", namely with regard to the link rate R=C. It is possible to view it as such, but I find it a bit pathologic because the "pre-" is not really met since R=C and not R Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I89Ne-0008I3-K4; Tue, 10 Jul 2007 02:39:26 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I89Nd-0008Hp-E9 for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 02:39:25 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I89Nd-0008Hh-2y for pcn@ietf.org; Tue, 10 Jul 2007 02:39:25 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I89NN-0003pH-Kt for pcn@ietf.org; Tue, 10 Jul 2007 02:39:25 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 21B6B7D7A for ; Tue, 10 Jul 2007 08:38:37 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 14BA17D82 for ; Tue, 10 Jul 2007 08:38:37 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 0199F7D7A for ; Tue, 10 Jul 2007 08:38:37 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6A6cak29292 for ; Tue, 10 Jul 2007 08:38:36 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 95D996F58E for ; Tue, 10 Jul 2007 08:33:00 +0200 (CEST) Message-ID: <469328D9.60408@informatik.uni-wuerzburg.de> Date: Tue, 10 Jul 2007 08:36:09 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: pcn@ietf.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: e1e48a527f609d1be2bc8d8a70eb76cb Subject: [PCN] Probing in the presence of hash-based load balancing X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, I would like to start a discussion regarding the probing mechanism. I see the following constraints when equal-cost multipath (ECMP) routing is used: 1) Probe packets must have the same source and destination addresses as well as source and destination ports as normal data packets because load balancing algorithms compute a hash over relevant packet header entries and depending on this hash value, they forward the packets to one of several possible outgoing interfaces. This assures that all packets of the same flow take the same route. 2) PCN-based AC is a border-to-border solution. Therefore, PCN-related signaling packets should not leave the network although equipped with "wrong" source and destination addresses. Is that true? If not, why not? 3) A standardized mechanism is required to encode probe packets that PCN egress routers can recognize and intercept them, and to signal appropriate feedback to the corresponding AC entities. 4) I don't know the exact header fields used for the hash-based load balancing. These fields should be the same for normal data packets and probe packets to make sure that they all take the same path. Which fields are typically used for that purpose? Those that are typically not used might be changed to indicate that PCN packets are used for probing. Are these assumptions correct? What mechanisms are possible? Best wishes, Michael -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 10 02:47:01 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I89Uz-0007Bi-3f; Tue, 10 Jul 2007 02:47:01 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I89Uw-0007Bc-T6 for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 02:46:58 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I89Ut-0007BU-Gd for pcn@ietf.org; Tue, 10 Jul 2007 02:46:55 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I89Uo-0001Rn-Vo for pcn@ietf.org; Tue, 10 Jul 2007 02:46:55 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 8325C7902 for ; Tue, 10 Jul 2007 08:46:48 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 7566281AF for ; Tue, 10 Jul 2007 08:46:48 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 53CF07902 for ; Tue, 10 Jul 2007 08:46:48 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6A6kmk29406 for ; Tue, 10 Jul 2007 08:46:48 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id DF1876F58E for ; Tue, 10 Jul 2007 08:41:11 +0200 (CEST) Message-ID: <46932AC5.2010909@informatik.uni-wuerzburg.de> Date: Tue, 10 Jul 2007 08:44:21 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: pcn@ietf.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: c1c65599517f9ac32519d043c37c5336 Subject: [PCN] Terminology X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, I would like to discuss (again) some terminology for PCN. To get things done quickly, we stuck in the architecture draft to the working nomenclature from the CL draft and left the exact names for further discussion. See Section 2 of http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.txt We proposed an alternative nomenclature in Section 1.3 of http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt The main differences are the following four names, all other terms are fine: "admissible rate" instead of "configured-admission-rate": It's the rate that CAN be admitted. Then it is self-understood that the rate is not measured but configured. "supportable rate" instead of "configured-termination-rate": It's the rate that CAN be supported. Then it is self-understood that the rate is not measured but configured. Furthermore, an alternative action for flow termination is rate reduction for which the name "termination" is not appropriate. "admission-stop marking" instead of "admission-marking": The meaning of the marking is that admission should be stopped. The name "admission-marking" rather suggests the opposite. This is also in line with the single-marking approach. "excess-traffic marking" instead of "termination-marking": The name "termination-marking" is fine as long as flow termination is the only option to reduce the rate of ingress-egress-aggregates when the supportable rate of a link is exceeded. However, an alternative reaction to this marking is flow rate reduction (although not in this charter). Therefore, the name of that marking should be neutral with regard to the action. Regards, Michael -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 10 12:07:16 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8IFA-0006mt-Bv; Tue, 10 Jul 2007 12:07:16 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8IF9-0006mk-V8 for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 12:07:15 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8IF9-0006ma-LO for pcn@ietf.org; Tue, 10 Jul 2007 12:07:15 -0400 Received: from imr1.ericy.com ([198.24.6.9]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I8IF9-00019v-DM for pcn@ietf.org; Tue, 10 Jul 2007 12:07:15 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr1.ericy.com (8.13.1/8.13.1) with ESMTP id l6AGBG28019301 for ; Tue, 10 Jul 2007 11:11:16 -0500 Received: from eusrcmw750.eamcs.ericsson.se ([138.85.77.50]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Tue, 10 Jul 2007 11:07:14 -0500 Received: from [147.117.169.165] ([147.117.169.165]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Tue, 10 Jul 2007 11:07:14 -0500 From: Steven Blake To: pcn Content-Type: multipart/mixed; boundary="=-AV8a9qD96xyOxOeqJVk3" Organization: Ericsson IP Infrastructure Date: Tue, 10 Jul 2007 12:07:13 -0400 Message-Id: <1184083633.12129.12.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) X-OriginalArrivalTime: 10 Jul 2007 16:07:14.0511 (UTC) FILETIME=[61701DF0:01C7C30C] X-Spam-Score: 0.0 (/) X-Scan-Signature: 52f7a77164458f8c7b36b66787c853da Subject: [PCN] IETF 69 *DRAFT* PCN agenda X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org --=-AV8a9qD96xyOxOeqJVk3 Content-Type: text/plain Content-Transfer-Encoding: 7bit Attached is the draft agenda for the Chicago meeting, also available at: http://www3.ietf.org/proceedings/07jul/agenda/pcn.txt Please send comments/corrections to the list ASAP. See you in Chicago. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 --=-AV8a9qD96xyOxOeqJVk3 Content-Disposition: attachment; filename=pcn-ietf69-agenda.txt Content-Type: text/plain; name=pcn-ietf69-agenda.txt; charset=UTF-8 Content-Transfer-Encoding: 7bit Congestion and Pre-Congestion Notification WG (pcn) Wednesday, July 25, 2007 0900-1130 Morning Session I Adams ==================================== CHAIRs: Scott Bradner Steven Blake AGENDA: o Administrivia chairs 10 min - Blue sheets - Scribe - Agenda bash - Milestones status o Pre-Congestion Notification Architecture Philip Eardley 30 min draft-eardley-pcn-architecture-00 o LC-PCN - The Load Control PCN Solution G. Karagiannis 15 min draft-westberg-pcn-load-control-00 o Pre-Congestion Notification Encoding Comparison Kwok-Ho Chan 30 min draft-chan-pcn-encoding-comparison-00 o Three State PCN Marking Kwok-Ho Chan 15 min draft-babiarz-pcn-3sm-00 o Pre-Congestion Notification Using Single Marking Anna Charny 10 min for Admission and Termination draft-charny-pcn-single-marking-02 o Performance Evaluation fo CL-PHB Admission and Anna Charny 10 min Termination Algorithms draft-zhang-pcn-performance-evaluation-02 --=-AV8a9qD96xyOxOeqJVk3 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --=-AV8a9qD96xyOxOeqJVk3-- From pcn-bounces@ietf.org Tue Jul 10 12:38:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Ij6-00079Q-VE; Tue, 10 Jul 2007 12:38:12 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8Ij6-000776-91 for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 12:38:12 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Ij5-00075p-Us for pcn@ietf.org; Tue, 10 Jul 2007 12:38:11 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8Ij5-0001Pa-My for pcn@ietf.org; Tue, 10 Jul 2007 12:38:11 -0400 Received: from zrtphxm1.corp.nortel.com (zrtphxm1.corp.nortel.com [47.140.202.50]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6AGbDa15125 for ; Tue, 10 Jul 2007 16:37:13 GMT Received: from KCHAN-2K3.nortel.com ([47.16.54.136] RDNS failed) by zrtphxm1.corp.nortel.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 10 Jul 2007 12:37:12 -0400 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Tue, 10 Jul 2007 12:37:10 -0400 To: pcn@ietf.org From: "Kwok-Ho Chan" Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Message-ID: X-OriginalArrivalTime: 10 Jul 2007 16:37:13.0179 (UTC) FILETIME=[918712B0:01C7C310] X-Spam-Score: 0.0 (/) X-Scan-Signature: ea4ac80f790299f943f0a53be7e1a21a Subject: [PCN] EncodingCompDraftIssue#1: Reliance on DiffServ for traffic separation X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org This is the start of Issue #1 for draft-chan-pcn-encoding-comparison-xx.txt. In -00 of the Encoding Comparison draft, we have organized the encoding choices and made some assumptions on the possible use of DiffServ for the purpose of separating the PCN traffic from all other traffic. Would want to test this assumption by making it the Issue #1 for the Encoding Comparison draft: "Should the PCN WG requires the use of DiffServ (or some other mechanism) to separate the PCN (packet) traffic from all other (packet) traffic?" The result of discussion on this Issue #1 will affect how we compare the different Encoding choices (including the use of ECN bits and other DSCPs). This assumption on requirement may also affect the Requirements on Metering Algorithms and Marking Semantics as we go forward. A secondary (for the future) idea that may play into this discussion is that should we use PCN on other real-time traffic service classes? Should these different real-time service classes be separated by the use of DiffServ? Thanks! -- Kwok -- _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 10 12:53:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Ixd-0005og-LT; Tue, 10 Jul 2007 12:53:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8Ixb-0005oW-OY for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 12:53:11 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Ixb-0005oN-E0 for pcn@ietf.org; Tue, 10 Jul 2007 12:53:11 -0400 Received: from rtp-iport-1.cisco.com ([64.102.122.148]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I8IxV-0002TW-KJ for pcn@ietf.org; Tue, 10 Jul 2007 12:53:11 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-1.cisco.com with ESMTP; 10 Jul 2007 12:53:05 -0400 X-IronPort-AV: i="4.16,523,1175486400"; d="txt'?scan'208"; a="64807284:sNHT290705556" Received: from rtp-core-2.cisco.com (rtp-core-2.cisco.com [64.102.124.13]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6AGr55M026069 for ; Tue, 10 Jul 2007 12:53:05 -0400 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id l6AGr5s0002228 for ; Tue, 10 Jul 2007 16:53:05 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 10 Jul 2007 12:53:04 -0400 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C7C312.C8BBD015" Date: Tue, 10 Jul 2007 12:53:03 -0400 Message-ID: X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: Replacing corrupted version of draft-charny-pcn-single-marking Thread-Index: AcfDEXhVrgHLATEZREaxP0j75jQ2xwAAAeFw From: "Anna Charny \(acharny\)" To: X-OriginalArrivalTime: 10 Jul 2007 16:53:04.0997 (UTC) FILETIME=[C8DAF950:01C7C312] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=156900; t=1184086385; x=1184950385; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20Replacing=20corrupted=20version=20of=20draft-charny-pcn-singl e-marking |Sender:=20 |To:=20; bh=lk4vFehspZMAw1aspD63ZcfJS1Hmj4C2srFne6SkOuU=; b=dFy6Y98lW09JXtNlK2izXpKlxHQyY41gj/zS/wfULrMD2ujx8JpTGPVsGpnvYs65sWbvSLeu we2QM5oLr6sQd7fbd1JJqr6yM1h7m0La9zeRWGf5A/uxGFX78bL5tGlM; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: 0.0 (/) X-Scan-Signature: dbfb79d92942ee1182cb668b1064ded6 Subject: [PCN] Replacing corrupted version of draft-charny-pcn-single-marking X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. ------_=_NextPart_001_01C7C312.C8BBD015 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, It appears that the version of the Single Marking draft that was sent yesterday somehow got corrupted. Please find the new version (it was also reposted to the ietf-drafts@ietf.org, but will take some time propagating). Sorry for any inconvenience this may have caused. 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ICBGdW5kaW5nIGZvciB0aGUgUkZDIEVkaXRvciBmdW5jdGlvbiBpcyBwcm92aWRlZCBieSB0aGUg SUVURg0KICAgQWRtaW5pc3RyYXRpdmUgU3VwcG9ydCBBY3Rpdml0eSAoSUFTQSkuDQoNCg0KDQoN Cg0KQ2hhcm55LCBldCBhbC4gICAgICAgICAgRXhwaXJlcyBKYW51YXJ5IDEwLCAyMDA4ICAgICAg ICAgICAgICAgW1BhZ2UgNDVdDQoMDQoNCg0K ------_=_NextPart_001_01C7C312.C8BBD015 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn ------_=_NextPart_001_01C7C312.C8BBD015-- From pcn-bounces@ietf.org Tue Jul 10 16:57:16 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Mlo-0003Cb-Ev; Tue, 10 Jul 2007 16:57:16 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8Mlm-0003Bh-Up for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 16:57:14 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Mlm-0003BN-Ht for pcn@ietf.org; Tue, 10 Jul 2007 16:57:14 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8MEd-000394-5O for pcn@ietf.org; Tue, 10 Jul 2007 16:22:59 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6AKMTa24923 for ; Tue, 10 Jul 2007 20:22:29 GMT X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C7C330.00640A7D" Date: Tue, 10 Jul 2007 16:22:08 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651134E4E8@zcarhxm1.corp.nortel.com> X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: I-D ACTION:draft-babiarz-pcn-explicit-marking-01.txt Thread-Index: AcfDKnpCZ3TU+Gd+RBytACEGBlxbWwAA7V5w From: "Jozef Babiarz" To: X-Spam-Score: 0.0 (/) X-Scan-Signature: 67c1ea29f88502ef6a32ccec927970f0 Subject: [PCN] FW: I-D ACTION:draft-babiarz-pcn-explicit-marking-01.txt X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. ------_=_NextPart_001_01C7C330.00640A7D Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, Below is the draft that explains the performance results for the Three State PCN Marker from simulations that were done to date. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org]=20 Sent: July 10, 2007 3:15 PM To: i-d-announce@ietf.org Subject: I-D ACTION:draft-babiarz-pcn-explicit-marking-01.txt A New Internet-Draft is available from the on-line Internet-Drafts=20 directories. Title : Simulations Results for 3sM Author(s) : X. Liu, J. Babiarz Filename : draft-babiarz-pcn-explicit-marking-01.txt Pages : 31 Date : 2007-7-10 =09 This document describes the simulation setups and results for testing the Three State PCN Marking approach. Simulations done to date, demonstrate that the three state PCN marking approach has certain ability to support admission control and flow termination of real- time application flows at the congestion point of the PCN-enabled network. The real-time traffic used in the simulation covers voice and video traffic with large and small number of flows. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-babiarz-pcn-explicit-marking-0 1.txt To remove yourself from the I-D Announcement list, send a message to=20 i-d-announce-request@ietf.org with the word unsubscribe in the body of=20 the message.=20 You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce=20 to change your subscription settings. Internet-Drafts are also available by anonymous FTP. Login with the=20 username "anonymous" and a password of your e-mail address. After=20 logging in, type "cd internet-drafts" and then=20 "get draft-babiarz-pcn-explicit-marking-01.txt". A list of Internet-Drafts directories can be found in http://www.ietf.org/shadow.html=20 or ftp://ftp.ietf.org/ietf/1shadow-sites.txt Internet-Drafts can also be obtained by e-mail. Send a message to: mailserv@ietf.org. In the body type: "FILE /internet-drafts/draft-babiarz-pcn-explicit-marking-01.txt". =09 NOTE: The mail server at ietf.org can return the document in MIME-encoded form by using the "mpack" utility. To use this feature, insert the command "ENCODING mime" before the "FILE" command. To decode the response(s), you will need "munpack" or a MIME-compliant mail reader. Different MIME-compliant mail readers exhibit different behavior, especially when dealing with "multipart" MIME messages (i.e. documents which have been split up into multiple messages), so check your local documentation on how to manipulate these messages. Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft. ------_=_NextPart_001_01C7C330.00640A7D Content-Type: application/octet-stream; name="ATT2980140.TXT" Content-Transfer-Encoding: base64 Content-Description: ATT2980140.TXT Content-Disposition: attachment; filename="ATT2980140.TXT" Q29udGVudC1UeXBlOiBNZXNzYWdlL0V4dGVybmFsLWJvZHk7IGFjY2Vzcy10eXBlPSJtYWlsLXNl cnZlciI7DQoJc2VydmVyPSJtYWlsc2VydkBpZXRmLm9yZyINCg0KQ29udGVudC1UeXBlOiB0ZXh0 L3BsYWluDQpDb250ZW50LUlEOiA8MjAwNy03LTEwMTQ0OTAzLkktREBpZXRmLm9yZz4NCg0KRU5D T0RJTkcgbWltZQ0KRklMRSAvaW50ZXJuZXQtZHJhZnRzL2RyYWZ0LWJhYmlhcnotcGNuLWV4cGxp Y2l0LW1hcmtpbmctMDEudHh0DQo= ------_=_NextPart_001_01C7C330.00640A7D Content-Type: application/octet-stream; name="draft-babiarz-pcn-explicit-marking-01.URL" Content-Transfer-Encoding: base64 Content-Description: draft-babiarz-pcn-explicit-marking-01.URL Content-Disposition: attachment; filename="draft-babiarz-pcn-explicit-marking-01.URL" W0ludGVybmV0U2hvcnRjdXRdDQpVUkw9ZnRwOi8vZnRwLmlldGYub3JnL2ludGVybmV0LWRyYWZ0 cy9kcmFmdC1iYWJpYXJ6LXBjbi1leHBsaWNpdC1tYXJraW5nLTAxLnR4dA0K ------_=_NextPart_001_01C7C330.00640A7D Content-Type: text/plain; name="ATT2980141.txt" Content-Transfer-Encoding: base64 Content-Description: ATT2980141.txt Content-Disposition: attachment; filename="ATT2980141.txt" X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18NCkktRC1Bbm5v dW5jZSBtYWlsaW5nIGxpc3QNCkktRC1Bbm5vdW5jZUBpZXRmLm9yZw0KaHR0cHM6Ly93d3cxLmll dGYub3JnL21haWxtYW4vbGlzdGluZm8vaS1kLWFubm91bmNlDQo= ------_=_NextPart_001_01C7C330.00640A7D Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn ------_=_NextPart_001_01C7C330.00640A7D-- From pcn-bounces@ietf.org Tue Jul 10 23:56:53 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8TJs-0001mY-F8; Tue, 10 Jul 2007 23:56:53 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8TJq-0001mS-Sq for pcn-confirm+ok@megatron.ietf.org; Tue, 10 Jul 2007 23:56:50 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8TJq-0001mJ-2d for pcn@ietf.org; Tue, 10 Jul 2007 23:56:50 -0400 Received: from szxga03-in.huawei.com ([61.144.161.55]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I8TJf-0003ix-T4 for pcn@ietf.org; Tue, 10 Jul 2007 23:56:50 -0400 Received: from huawei.com (szxga03-in [172.24.2.9]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JKZ00L2BXKXFJ@szxga03-in.huawei.com> for pcn@ietf.org; Wed, 11 Jul 2007 11:55:45 +0800 (CST) Received: from huawei.com ([172.24.1.18]) by szxga03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JKZ003I7XKWE7@szxga03-in.huawei.com> for pcn@ietf.org; Wed, 11 Jul 2007 11:55:45 +0800 (CST) Received: from z24109a ([10.70.76.134]) by szxml03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JKZ00BXTXKVI5@szxml03-in.huawei.com> for pcn@ietf.org; Wed, 11 Jul 2007 11:55:44 +0800 (CST) Date: Wed, 11 Jul 2007 11:55:43 +0800 From: Tina TSOU Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt To: pcn@ietf.org, philip.eardley@bt.com Message-id: <010201c7c36f$5af23f40$864c460a@china.huawei.com> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 Content-type: multipart/mixed; boundary="Boundary_(ID_Kn3VXE4gUeWt0sHE4hMG3w)" X-Priority: 3 X-MSMail-priority: Normal References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2F1@E03MVZ1-UKDY.domain1.systemhost.net> X-Spam-Score: 0.0 (/) X-Scan-Signature: c99a7d283a5fe9fd4417370f49cee821 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --Boundary_(ID_Kn3VXE4gUeWt0sHE4hMG3w) Content-type: text/plain; format=flowed; charset=utf-8; reply-type=original Content-transfer-encoding: 7BIT Hi Phil, I made some proposed specific changes with revised mark together with comments in the attachment. Hope it helps:) B. R. Tina ----- Original Message ----- From: To: ; Sent: Monday, July 09, 2007 8:16 PM Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Tina Thanks I'm not sure I completely understand your comments, sorry. Is the problem that at the moment the draft only describes the Pull model and not the Push model? Which lines of text need changing? (somewhere in Section 5.4 or section 7 or somewhere else?) Thanks! phil > -----Original Message----- > From: Tina TSOU [mailto:tena@huawei.com] > Sent: 02 July 2007 04:38 > To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R > Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > Hi all, > One of the scenarios I am suggesting is below. > > Even in Pull mode, application layer QoS request (via RSVP) should be also > sent from ingress to the centralized node, in centralized node the policy > is > generated, then the decision is made, and then delivers to the Ingress to > enforce. I was not saying that the policy is directly generated in the > Ingress. Even the rather that Push mode should be also taken into account. > > I.e. we define the centralized node locates in the transport control > layer; > the Ingress and Egress locate in transport layer. For the implementation > of > physical entities, they are service policy server and PCN-enabled router > respectively. > > The centralized node is policy decision node, it should be based on (1) > Egress measurement result (2) operator's policies (could be configured in > the centralized node) (3) QoS request coming from the application layer > (PUSH or PULL mode), to make the decision, and decide which flows should > be > admitted or reject, which flows should be stopped temperately or > downgraded, > which flows should be done policing. The generated policy should be sent > to > ingress for enforcement. > > Ingress is the policy enforcement point, it based on the policy delivered > by > the centralized node, (1) it allows flow pass or filter flow, (2) for the > flows allowed to pass, it makes policing and coloring based on the policy. > > Referrence: > QoS "Push" Model: model where the centralised node "pushes" traffic > policies > to the transport functions to enforce its policy decisions. > NOTE: In this model, the CPE does not itself support native application > independent QoS procedures. > QoS "Pull" Model: model where, upon request from the transport processing > functions, the centralised node provides traffic policies to the transport > processing functions. The request from the transport processing functions > may itself, for example, be triggered by path-coupled requests coming from > user equipment and/or transport network elements. > > > B. R. > Tina > > ----- Original Message ----- > From: > To: > Sent: Thursday, June 28, 2007 11:59 PM > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > Hi all, > > Just a reminder that all comments on this draft would be great. It aims > to describe the PCN architecture, in light of the PCN WG's Charter & its > Milestone of an Info doc on 'Flow Admission and Termination Architecture > within a Diffserv Domain' (due Nov 07). > > S1 Introduction. > This is quite short. If desired, it could be boosted with a general > explanation of where PCN fits into the picture of QoS and how it's > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) > > S2 Terminology > In the "Editor's note" are 3 alternative terms that some of the authors > preferred. > > S3 Assumptions and constraints on scope > These are the 4 things mentioned in the Charter, plus some explanation > of them. Are they clear? Also we mention some of the ways that a future > revised Charter might look at overcoming some of the > constraints/assumptions; is this sub-section at the right depth? > > S4 High-level functional architecture > We have tried to write this section (and the following ones) so that it > fits all the various proposals there've been for PCN mechanisms. Does > this make the section too wishy-washy or too hard to understand? Should > it include some comparison of the different mechanisms proposed > (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? > > S5 Detailed Functional architecture > Is this a reasonable description of the extra functionality that PCN > requires on various nodes in the PCN-domain? Is it the right way to > split up the description? For clarity / help reader's understanding, > should there be some specific examples of how functionality might be > distributed (eg "if you followed the deployment model in > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made at > the PCN-egress-node, communicated to the PCN-ingress-nodes which makes > the admission decision; etc.") > > S6 Design goals and challenges > This briefly describes some open issues, taken from > briscoe-tsvwg-cl-architecture. Are there other ones that should be > mentioned? Is the problem description at the right level of depth? > Should we discuss various possible solutions to these problems? > > S7 Deployment scenarios > Briefly describes some deployment scenarios for pcn? is this at the > right level of depth? > > S8 Operations and Management > This section was written in response to the Charter saying that the > architecture document should include security, manageability and > operational considerations. The draft addresses this by providing some > thoughts under the FCAPS headings: OAM of Faults, Configuration, > Accounting, Performance and Security? Is this the right way of > structuring it - does it cover the right set of topics? Is the text at > the right level? - eg should it also have a detailed set of parameters > that would be available for configuration? > > An overall question is whether the draft should have more comparison of > the options (pros/cons) for various aspects. > > I aim to edit another version of the draft before the ietf (but maybe > not before the deadline as I'm on hols next week). > > Thanks! > Phil/ > > > > -----Original Message----- > > From: Kwok-Ho Chan [mailto:khchan@nortel.com] > > Sent: 22 June 2007 04:38 > > To: pcn@ietf.org > > Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > > Hi all: > > Please see the attached E-Mail on the posting of the PCN Architecture > > draft. > > On behave of the editor of this draft: Phil, and the co-authors of > this > > draft, > > we would like to request for reviews and comments of this draft and > > welcome > > any comments for improvements. > > > > Please send your comments/discussions of this draft on the PCN list. > > > > Thank you for your interest and review of this draft! > > -- Kwok on behave of the co-authors of this draft -- > > > > > > >To: i-d-announce@ietf.org > > >Cc: > > >From: Internet-Drafts@ietf.org > > >Date: Thu, 21 Jun 2007 15:50:02 -0400 > > >X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 > > >Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > >X-BeenThere: i-d-announce@ietf.org > > >X-Mailman-Version: 2.1.5 > > >Reply-To: internet-drafts@ietf.org > > >List-Id: i-d-announce.ietf.org > > >List-Unsubscribe: > , > > > > > >List-Archive: > > >List-Post: > > >List-Help: > > >List-Subscribe: > , > > > > > >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, > > > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=4 > > >X-Spam-Score: 5.3 > > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > > ecarhea1.nortel.com > > >X-DNSBL-Score: -50 > > >X-DNSBL-Servers: bl.nortel.com > > >X-SMTP-HELO: megatron.ietf.org > > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > > >X-SMTP-RCPT-TO: > > > >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel > .c > > > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel > .c > > > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c > om > > >X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] > > >X-SMTP-REASON: PASSED > > >X-SMTP-ID: 1182455563.14011407 > > >X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) > > >FILETIME=[BC4965C0:01C7B43D] > > > > > >A New Internet-Draft is available from the on-line Internet-Drafts > > >directories. > > > > > > > > > Title : Pre-Congestion Notification Architecture > > > Author(s) : P. Eardley, et al. > > > Filename : draft-eardley-pcn-architecture-00.txt > > > Pages : 27 > > > Date : 2007-6-21 > > > > > > The purpose of this document is to describe a general > architecture > > > for flow admission and termination based on aggregated (pre-) > > > congestion information in order to protect the quality of service > of > > > established inelastic flows within a single DiffServ domain. > > > > > > > > >A URL for this Internet-Draft is: > > > >http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t > xt > > > > > >To remove yourself from the I-D Announcement list, send a message to > > >i-d-announce-request@ietf.org with the word unsubscribe in the body > of > > >the message. > > >You can also visit > https://www1.ietf.org/mailman/listinfo/I-D-announce > > >to change your subscription settings. > > > > > >Internet-Drafts are also available by anonymous FTP. Login with the > > >username "anonymous" and a password of your e-mail address. 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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA --Boundary_(ID_Kn3VXE4gUeWt0sHE4hMG3w) Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --Boundary_(ID_Kn3VXE4gUeWt0sHE4hMG3w)-- From pcn-bounces@ietf.org Wed Jul 11 02:13:56 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8VSW-0006Et-5J; Wed, 11 Jul 2007 02:13:56 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8VSV-0006DP-7t for pcn-confirm+ok@megatron.ietf.org; Wed, 11 Jul 2007 02:13:55 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8VSU-0006Ck-Ck for pcn@ietf.org; Wed, 11 Jul 2007 02:13:54 -0400 Received: from gecko.sbs.de ([194.138.37.40]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8VSE-0007JR-Sf for pcn@ietf.org; Wed, 11 Jul 2007 02:13:54 -0400 Received: from mail1.sbs.de (localhost [127.0.0.1]) by gecko.sbs.de (8.12.6/8.12.6) with ESMTP id l6B6D5A3008017; Wed, 11 Jul 2007 08:13:05 +0200 Received: from fthw9xpa.ww002.siemens.net (fthw9xpa.ww002.siemens.net [157.163.133.222]) by mail1.sbs.de (8.12.6/8.12.6) with ESMTP id l6B6D5IQ020288; Wed, 11 Jul 2007 08:13:05 +0200 Received: from MCHP7I5A.ww002.siemens.net ([139.25.131.136]) by fthw9xpa.ww002.siemens.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 11 Jul 2007 08:13:05 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Date: Wed, 11 Jul 2007 08:13:02 +0200 Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Pre-congestion and ECN Thread-Index: AcfDC2oE4qnbZ8AsT5aW2qNywC8UoQAdl25w References: From: "Charzinski, Joachim" To: , X-OriginalArrivalTime: 11 Jul 2007 06:13:05.0510 (UTC) FILETIME=[8B640060:01C7C382] X-Spam-Score: 0.0 (/) X-Scan-Signature: 3e15cc4fdc61d7bce84032741d11c8e5 Cc: Subject: [PCN] RE: Pre-congestion and ECN X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Michael, > Congestion observed in real queues by ECN can be seen as a=20 > special form=20 > of "pre-congestion", namely with regard to the link rate R=3DC. It is=20 > possible to view it as such, but I find it a bit pathologic=20 > because the=20 > "pre-" is not really met since R=3DC and not R=20 > This makes the difference between PCN and ECN explicit: ECN starts=20 > marking packets when real queueing (=3Dcongestion) occurs while PCN=20 > already marks packets when pre-congestion occurs, i.e., when=20 > a rate R is exceeded and no physical queues arise. Isn't this also a question of time scales? ECN would diagnose=20 "congestion" (which from the way ECN works should mostly be=20 considered pre-congestion) when a queue is found significantly=20 filled. This can happen also when RC during the very recent (mostly less than 1s)=20 past.=20 As I understood it, PCN is supposed to cover the longer time scales.=20 Thus, in PCN notation, ECN would actually signal pre-congestion in=20 most cases.=20 Best regards Joachim. ---------------------------------------------------------- Nokia Siemens Networks =20 Joachim Charzinski Principal Innovator Machtlfinger Str. 1 D-81379 Muenchen Germany Tel: +49 89 722 46803 Joachim.Charzinski@nsn.com=20 http://www.nokiasiemensnetworks.com/global/ Think before you print Nokia Siemens Networks GmbH & Co. KG - Sitz der Gesellschaft: M=FCnchen = / Registered office: Munich - Registergericht: M=FCnchen / Commercial = registry: Munich, HRA 88537 - WEEE-Reg.-Nr.: DE 52984304 - Pers=F6nlich = haftende Gesellschafterin / General Partner: Nokia Siemens Networks = Management GmbH - Gesch=E4ftsleitung / Board of Directors: Joachim = Malterer, Lydia Sommer - Sitz der Gesellschaft: M=FCnchen / Registered = office: Munich - Registergericht: M=FCnchen / Commercial registry: = Munich, HRB 163416 =20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 11 02:32:02 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Vk1-0000IH-Qu; Wed, 11 Jul 2007 02:32:02 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8Vk0-0000IB-Vs for pcn-confirm+ok@megatron.ietf.org; Wed, 11 Jul 2007 02:32:00 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8Vk0-0000I3-KY for pcn@ietf.org; Wed, 11 Jul 2007 02:32:00 -0400 Received: from tcmail31.telekom.de ([217.6.95.238]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8Vjl-0007aZ-7q for pcn@ietf.org; Wed, 11 Jul 2007 02:32:00 -0400 Received: from S4DE8PSAANQ.mitte.t-com.de by tcmail31.telekom.de with ESMTP; Wed, 11 Jul 2007 08:31:12 +0200 Received: from S4DE8PSAAFQ.mitte.t-com.de ([10.151.180.5]) by S4DE8PSAANQ.mitte.t-com.de with Microsoft SMTPSVC(6.0.3790.3959); Wed, 11 Jul 2007 08:31:11 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] EncodingCompDraftIssue#1: Reliance on DiffServ for traffic separation Date: Wed, 11 Jul 2007 08:31:11 +0200 Message-Id: <6439282641581441A36F7F6F83ED2ED201DB9937@S4DE8PSAAFQ.mitte.t-com.de> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] EncodingCompDraftIssue#1: Reliance on DiffServ for traffic separation thread-index: AcfDELhv4bsIVSYhQX6lgFrWaQU15wAcx94g From: "Geib, Ruediger" To: , X-OriginalArrivalTime: 11 Jul 2007 06:31:11.0897 (UTC) FILETIME=[12ED8090:01C7C385] X-Spam-Score: 0.0 (/) X-Scan-Signature: 68c8cc8a64a9d0402e43b8eee9fc4199 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Kwok, |"Should the PCN WG requires the use of DiffServ (or some other=20 |mechanism) to separate the PCN (packet) traffic from all other=20 |(packet) traffic?" Is your question, whether PCN traffic should have dedicated=20 resources?=20 Regards, Ruediger _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 11 11:57:22 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8eZ8-0006Rk-1m; Wed, 11 Jul 2007 11:57:22 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8eZ7-0006R1-Be for pcn-confirm+ok@megatron.ietf.org; Wed, 11 Jul 2007 11:57:21 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8eZ6-0006PO-Rb for pcn@ietf.org; Wed, 11 Jul 2007 11:57:21 -0400 Received: from zcars04e.nortel.com ([47.129.242.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8eYu-0004Df-Ff for pcn@ietf.org; Wed, 11 Jul 2007 11:57:20 -0400 Received: from zrtphxm1.corp.nortel.com (zrtphxm1.corp.nortel.com [47.140.202.50]) by zcars04e.nortel.com (Switch-2.2.0/Switch-2.2.0) with ESMTP id l6BFsZj02960; Wed, 11 Jul 2007 15:54:35 GMT Received: from KCHAN-2K3.nortel.com ([47.16.54.136] RDNS failed) by zrtphxm1.corp.nortel.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 11 Jul 2007 11:56:07 -0400 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Wed, 11 Jul 2007 11:56:06 -0400 To: "Geib, Ruediger" From: "Kwok-Ho Chan" Subject: RE: [PCN] EncodingCompDraftIssue#1: Reliance on DiffServ for traffic separation In-Reply-To: <6439282641581441A36F7F6F83ED2ED201DB9937@S4DE8PSAAFQ.mitte .t-com.de> References: <6439282641581441A36F7F6F83ED2ED201DB9937@S4DE8PSAAFQ.mitte.t-com.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Message-ID: X-OriginalArrivalTime: 11 Jul 2007 15:56:07.0714 (UTC) FILETIME=[FE68B820:01C7C3D3] X-Spam-Score: 0.0 (/) X-Scan-Signature: 769a46790fb42fbb0b0cc700c82f7081 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Ruediger: There are actually multiple impacts that can result from discussion of this issue: - PCN Encoding choices, with PCN traffic separated, there are encoding states that can be off-loaded from the 2 bit ECN field. Providing some flexibility to encoding choices. Then there is the question of how much separation should be provided by DiffServ? Should DiffServ be used to encode all PCN states? - PCN Metering mechanism, with PCN traffic separated, there may be different factors to consider when considering PCN Metering mechanism requirements. With this, there are actually 2 kinds of resources: - the bits in the IP header for encoding is a resource - the traffic forwarding path resources And there is also management/operational resource that need to be considered. So the answer to your question YES, whether PCN traffic should have dedicated resources in both Encoding sense and Traffic Forwarding sense. And we may have additional questions when we want to consider more than one kind of PCN traffic. I am starting this off as an EncodingCompDraft Issue just because this is the first major discussion we need to have to generate -01 of the EncodingCompDraft. Hope this helps. Thanks! -- Kwok -- At 02:31 AM 7/11/2007, Geib, Ruediger wrote: >Hi Kwok, > >|"Should the PCN WG requires the use of DiffServ (or some other >|mechanism) to separate the PCN (packet) traffic from all other >|(packet) traffic?" > >Is your question, whether PCN traffic should have dedicated >resources? > >Regards, > >Ruediger _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 11 12:28:35 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8f3L-0007tE-DC; Wed, 11 Jul 2007 12:28:35 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8f3J-0007oJ-J6 for pcn-confirm+ok@megatron.ietf.org; Wed, 11 Jul 2007 12:28:33 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8f3J-0007o5-6l for pcn@ietf.org; Wed, 11 Jul 2007 12:28:33 -0400 Received: from smtp104.rog.mail.re2.yahoo.com ([206.190.36.82]) by ietf-mx.ietf.org with smtp (Exim 4.43) id 1I8f3F-0005hw-Is for pcn@ietf.org; Wed, 11 Jul 2007 12:28:33 -0400 Received: (qmail 13132 invoked from network); 11 Jul 2007 16:28:29 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=rogers.com; h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=KLHQdI6lz0vpU7IlmiiqZn3SHLvdJ0jfG9ApGCqiHzLHKxRDcDbctRa+lQGEicrCKtYkJ2vwUujhmjzInVFJSp5eWmznXlxZsTrXVt7vvyUrvQceY+BbDrzaVhEGga42NbWMla5qO62cXUVI1vr74AieBzsCrRF22UpCp37K2/Q= ; Received: from unknown (HELO ?192.168.0.101?) (tom.taylor@rogers.com@74.105.35.229 with plain) by smtp104.rog.mail.re2.yahoo.com with SMTP; 11 Jul 2007 16:28:29 -0000 X-YMail-OSG: OZWCyNUVM1m.R7.7VYSrluCjtX1TNBWaOqe24vQXez4F87lLjGGW96CuCXbcUzQ7Ow-- Message-ID: <46950597.2070608@rogers.com> Date: Wed, 11 Jul 2007 12:30:15 -0400 From: Tom Taylor User-Agent: Thunderbird 2.0.0.4 (Windows/20070604) MIME-Version: 1.0 To: Tina TSOU Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2F1@E03MVZ1-UKDY.domain1.systemhost.net> <010201c7c36f$5af23f40$864c460a@china.huawei.com> In-Reply-To: <010201c7c36f$5af23f40$864c460a@china.huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Scan-Signature: fca7d4b87f391aa4d413f865ce6efe79 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org The idea of using a centralized node to collect the egress reports makes a lot of sense. We had the earlier discussion about how the egress node knows where to send its reports. If a centralized collection point is used, the address of that collection point can be configured in the egress nodes rather than requiring them to be topology-aware. Of course, that pushes the problem back to the collection node, but the problem may be simpler there. Tina TSOU wrote: > Hi Phil, > I made some proposed specific changes with revised mark together with > comments in the attachment. > Hope it helps:) > > B. R. > Tina > > ----- Original Message ----- From: > To: ; > Sent: Monday, July 09, 2007 8:16 PM > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > Tina > Thanks > I'm not sure I completely understand your comments, sorry. > > Is the problem that at the moment the draft only describes the Pull > model and not the Push model? Which lines of text need changing? > (somewhere in Section 5.4 or section 7 or somewhere else?) > > Thanks! > phil > >> -----Original Message----- >> From: Tina TSOU [mailto:tena@huawei.com] >> Sent: 02 July 2007 04:38 >> To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R >> Subject: Re: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt >> >> Hi all, >> One of the scenarios I am suggesting is below. >> >> Even in Pull mode, application layer QoS request (via RSVP) should be > also >> sent from ingress to the centralized node, in centralized node the > policy >> is >> generated, then the decision is made, and then delivers to the Ingress > to >> enforce. I was not saying that the policy is directly generated in the >> Ingress. Even the rather that Push mode should be also taken into > account. >> >> I.e. we define the centralized node locates in the transport control >> layer; >> the Ingress and Egress locate in transport layer. For the > implementation >> of >> physical entities, they are service policy server and PCN-enabled > router >> respectively. >> >> The centralized node is policy decision node, it should be based on > (1) >> Egress measurement result (2) operator's policies (could be configured > in >> the centralized node) (3) QoS request coming from the application > layer >> (PUSH or PULL mode), to make the decision, and decide which flows > should >> be >> admitted or reject, which flows should be stopped temperately or >> downgraded, >> which flows should be done policing. The generated policy should be > sent >> to >> ingress for enforcement. >> >> Ingress is the policy enforcement point, it based on the policy > delivered >> by >> the centralized node, (1) it allows flow pass or filter flow, (2) for > the >> flows allowed to pass, it makes policing and coloring based on the > policy. >> >> Referrence: >> QoS "Push" Model: model where the centralised node "pushes" traffic >> policies >> to the transport functions to enforce its policy decisions. >> NOTE: In this model, the CPE does not itself support native > application >> independent QoS procedures. >> QoS "Pull" Model: model where, upon request from the transport > processing >> functions, the centralised node provides traffic policies to the > transport >> processing functions. The request from the transport processing > functions >> may itself, for example, be triggered by path-coupled requests coming > from >> user equipment and/or transport network elements. >> >> >> B. R. >> Tina >> >> ----- Original Message ----- >> From: >> To: >> Sent: Thursday, June 28, 2007 11:59 PM >> Subject: RE: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt >> >> >> Hi all, >> >> Just a reminder that all comments on this draft would be great. It > aims >> to describe the PCN architecture, in light of the PCN WG's Charter & > its >> Milestone of an Info doc on 'Flow Admission and Termination > Architecture >> within a Diffserv Domain' (due Nov 07). >> >> S1 Introduction. >> This is quite short. If desired, it could be boosted with a general >> explanation of where PCN fits into the picture of QoS and how it's >> evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) >> >> S2 Terminology >> In the "Editor's note" are 3 alternative terms that some of the > authors >> preferred. >> >> S3 Assumptions and constraints on scope >> These are the 4 things mentioned in the Charter, plus some explanation >> of them. Are they clear? Also we mention some of the ways that a > future >> revised Charter might look at overcoming some of the >> constraints/assumptions; is this sub-section at the right depth? >> >> S4 High-level functional architecture >> We have tried to write this section (and the following ones) so that > it >> fits all the various proposals there've been for PCN mechanisms. Does >> this make the section too wishy-washy or too hard to understand? > Should >> it include some comparison of the different mechanisms proposed >> (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? >> >> S5 Detailed Functional architecture >> Is this a reasonable description of the extra functionality that PCN >> requires on various nodes in the PCN-domain? Is it the right way to >> split up the description? For clarity / help reader's understanding, >> should there be some specific examples of how functionality might be >> distributed (eg "if you followed the deployment model in >> draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made > at >> the PCN-egress-node, communicated to the PCN-ingress-nodes which makes >> the admission decision; etc.") >> >> S6 Design goals and challenges >> This briefly describes some open issues, taken from >> briscoe-tsvwg-cl-architecture. Are there other ones that should be >> mentioned? Is the problem description at the right level of depth? >> Should we discuss various possible solutions to these problems? >> >> S7 Deployment scenarios >> Briefly describes some deployment scenarios for pcn? is this at the >> right level of depth? >> >> S8 Operations and Management >> This section was written in response to the Charter saying that the >> architecture document should include security, manageability and >> operational considerations. The draft addresses this by providing some >> thoughts under the FCAPS headings: OAM of Faults, Configuration, >> Accounting, Performance and Security? Is this the right way of >> structuring it - does it cover the right set of topics? Is the text at >> the right level? - eg should it also have a detailed set of parameters >> that would be available for configuration? >> >> An overall question is whether the draft should have more comparison > of >> the options (pros/cons) for various aspects. >> >> I aim to edit another version of the draft before the ietf (but maybe >> not before the deadline as I'm on hols next week). >> >> Thanks! >> Phil/ >> >> >> > -----Original Message----- >> > From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> > Sent: 22 June 2007 04:38 >> > To: pcn@ietf.org >> > Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >> > >> > Hi all: >> > Please see the attached E-Mail on the posting of the PCN > Architecture >> > draft. >> > On behave of the editor of this draft: Phil, and the co-authors of >> this >> > draft, >> > we would like to request for reviews and comments of this draft and >> > welcome >> > any comments for improvements. >> > >> > Please send your comments/discussions of this draft on the PCN list. >> > >> > Thank you for your interest and review of this draft! >> > -- Kwok on behave of the co-authors of this draft -- >> > >> > >> > >To: i-d-announce@ietf.org >> > >Cc: >> > >From: Internet-Drafts@ietf.org >> > >Date: Thu, 21 Jun 2007 15:50:02 -0400 >> > >X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 >> > >Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt >> > >X-BeenThere: i-d-announce@ietf.org >> > >X-Mailman-Version: 2.1.5 >> > >Reply-To: internet-drafts@ietf.org >> > >List-Id: i-d-announce.ietf.org >> > >List-Unsubscribe: >> , >> > > >> > >List-Archive: >> > >List-Post: >> > >List-Help: >> > >List-Subscribe: >> , >> > > >> > >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, >> > > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=4 >> > >X-Spam-Score: 5.3 >> > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >> > ecarhea1.nortel.com >> > >X-DNSBL-Score: -50 >> > >X-DNSBL-Servers: bl.nortel.com >> > >X-SMTP-HELO: megatron.ietf.org >> > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >> > >X-SMTP-RCPT-TO: >> > >> >> kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel >> .c >> > >> > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel >> .c >> > >> > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c >> om >> > >X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] >> > >X-SMTP-REASON: PASSED >> > >X-SMTP-ID: 1182455563.14011407 >> > >X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) >> > >FILETIME=[BC4965C0:01C7B43D] >> > > >> > >A New Internet-Draft is available from the on-line Internet-Drafts >> > >directories. >> > > >> > > >> > > Title : Pre-Congestion Notification Architecture >> > > Author(s) : P. Eardley, et al. >> > > Filename : draft-eardley-pcn-architecture-00.txt >> > > Pages : 27 >> > > Date : 2007-6-21 >> > > >> > > The purpose of this document is to describe a general >> architecture >> > > for flow admission and termination based on aggregated (pre-) >> > > congestion information in order to protect the quality of > service >> of >> > > established inelastic flows within a single DiffServ domain. >> > > >> > > >> > >A URL for this Internet-Draft is: >> > >> >> http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t >> xt >> > > >> > >To remove yourself from the I-D Announcement list, send a message > to >> > >i-d-announce-request@ietf.org with the word unsubscribe in the body >> of >> > >the message. >> > >You can also visit >> https://www1.ietf.org/mailman/listinfo/I-D-announce >> > >to change your subscription settings. >> > > >> > >Internet-Drafts are also available by anonymous FTP. Login with the >> > >username "anonymous" and a password of your e-mail address. After >> > >logging in, type "cd internet-drafts" and then >> > >"get draft-eardley-pcn-architecture-00.txt". >> > > >> > >A list of Internet-Drafts directories can be found in >> > >http://www.ietf.org/shadow.html >> > >or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> > > >> > >Internet-Drafts can also be obtained by e-mail. >> > > >> > >Send a message to: >> > > mailserv@ietf.org. >> > >In the body type: >> > > "FILE >> /internet-drafts/draft-eardley-pcn-architecture-00.txt". >> > > >> > >NOTE: The mail server at ietf.org can return the document in >> > > MIME-encoded form by using the "mpack" utility. To use > this >> > > feature, insert the command "ENCODING mime" before the >> "FILE" >> > > command. To decode the response(s), you will need > "munpack" >> or >> > > a MIME-compliant mail reader. Different MIME-compliant > mail >> > readers >> > > exhibit different behavior, especially when dealing with >> > > "multipart" MIME messages (i.e. documents which have been >> split >> > > up into multiple messages), so check your local >> documentation on >> > > how to manipulate these messages. >> > > >> > >Below is the data which will enable a MIME compliant mail reader >> > >implementation to automatically retrieve the ASCII version of the >> > >Internet-Draft. >> > > >> > >Content-Type: text/plain >> > >Content-ID: <2007-6-21120238.I-D@ietf.org> >> > > >> > >ENCODING mime >> > >FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt >> > > >> > > >> > >> > 00.txt> >> > >_______________________________________________ >> > >I-D-Announce mailing list >> > >I-D-Announce@ietf.org >> > >https://www1.ietf.org/mailman/listinfo/i-d-announce >> > >> > >> > >> > >> > _______________________________________________ >> > PCN mailing list >> > PCN@ietf.org >> > https://www1.ietf.org/mailman/listinfo/pcn >> >> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn > > ------------------------------------------------------------------------ > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 11 18:54:14 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8l4W-0007mf-1h; Wed, 11 Jul 2007 18:54:12 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8l4T-0007cm-J3 for pcn-confirm+ok@megatron.ietf.org; Wed, 11 Jul 2007 18:54:09 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8l4T-0007Zp-6m for pcn@ietf.org; Wed, 11 Jul 2007 18:54:09 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8l4S-0002qP-Ll for pcn@ietf.org; Wed, 11 Jul 2007 18:54:09 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id AC2697E2D; Thu, 12 Jul 2007 00:53:33 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 9F3237E36; Thu, 12 Jul 2007 00:53:33 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 763B07E2D; Thu, 12 Jul 2007 00:53:33 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6BMrXk15259; Thu, 12 Jul 2007 00:53:33 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 3F83D6F58E; Thu, 12 Jul 2007 00:47:55 +0200 (CEST) Message-ID: <46955EDB.5020102@informatik.uni-wuerzburg.de> Date: Thu, 12 Jul 2007 00:51:07 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: "Charzinski, Joachim" References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Scan-Signature: 2857c5c041d6c02d7181d602c22822c8 Cc: pcn@ietf.org Subject: [PCN] Re: Pre-congestion and ECN X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Joachim, thanks for this subtle question! Please see inline! Charzinski, Joachim wrote: > Hi Michael, > > =20 >> Congestion observed in real queues by ECN can be seen as a=20 >> special form=20 >> of "pre-congestion", namely with regard to the link rate R=3DC. It is=20 >> possible to view it as such, but I find it a bit pathologic=20 >> because the=20 >> "pre-" is not really met since R=3DC and not R> >> This makes the difference between PCN and ECN explicit: ECN starts=20 >> marking packets when real queueing (=3Dcongestion) occurs while PCN=20 >> already marks packets when pre-congestion occurs, i.e., when=20 >> a rate R> is exceeded and no physical queues arise. >> =20 > > Isn't this also a question of time scales?=20 Yes, that is absolutely true. The sensitivity to time scales (in other=20 words: reaction time of the markers when a certain rate is exceeded) can=20 be controlled by the token bucket sizes of the PCN meters and markers=20 which can be configured. In a similar way, the sensitivity to time=20 scales of ECN can be controlled by the parameters of its underlying RED=20 queue and the averaging parameter. > ECN would diagnose=20 > "congestion" (which from the way ECN works should mostly be=20 > considered pre-congestion) when a queue is found significantly=20 > filled. This can happen also when R mean values but R>C during the very recent (mostly less than 1s)=20 > past.=20 > =20 Basically, if ECN signals congestion, PCN will also signal=20 pre-congestion, but the opposite is not necessarily true. Thus, PCN=20 reacts earlier than ECN where "earlier" relates to the observed average=20 rate. However, this statement is not always true (this is probably what you=20 suspected) when we consider the time it takes until packets are marked.=20 Take an ECN marker that starts marking packets already at a very low=20 average fill state of the shortly-averaged physical size of its RED=20 queue. It is compared to a PCN meter and marker with R As I understood it, PCN is supposed to cover the longer time scales.=20 > =20 That's a good question! How fast should PCN react with admission-stop or=20 flow termination when the admissible or supportable rate is exceeded?=20 Within 100ms, 1s or 10s? The answer has a direct impact on the=20 configuration of the meters. What parameters are used for ECN markers in practice? > Thus, in PCN notation, ECN would actually signal pre-congestion in=20 > most cases. I would express that differently. ECN signals congestion, but possibly=20 earlier (with respect to the first marked packet) than PCN signals=20 pre-congestion. And sometimes the duration of the congestion is too=20 short for PCN to react. However, this all depends on the configured=20 parameters ... Best regards, Michael > =20 > > Best regards > > Joachim. > > ---------------------------------------------------------- > Nokia Siemens Networks > =20 > Joachim Charzinski > Principal Innovator > > Machtlfinger Str. 1 > D-81379 Muenchen > Germany > Tel: +49 89 722 46803 > > Joachim.Charzinski@nsn.com=20 > http://www.nokiasiemensnetworks.com/global/ > > Think before you print > > Nokia Siemens Networks GmbH & Co. KG - Sitz der Gesellschaft: M=FCnchen= / Registered office: Munich - Registergericht: M=FCnchen / Commercial re= gistry: Munich, HRA 88537 - WEEE-Reg.-Nr.: DE 52984304 - Pers=F6nlich haf= tende Gesellschafterin / General Partner: Nokia Siemens Networks Manageme= nt GmbH - Gesch=E4ftsleitung / Board of Directors: Joachim Malterer, Lydi= a Sommer - Sitz der Gesellschaft: M=FCnchen / Registered office: Munich -= Registergericht: M=FCnchen / Commercial registry: Munich, HRB 163416 > =20 > =20 --=20 Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 05:06:44 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8udI-0005sx-Fo; Thu, 12 Jul 2007 05:06:44 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8udG-0005sm-Oo for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 05:06:42 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8udC-0005sb-A2 for pcn@ietf.org; Thu, 12 Jul 2007 05:06:38 -0400 Received: from smtp.nokia.com ([131.228.20.172] helo=mgw-ext13.nokia.com) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8ucw-0003bf-Qo for pcn@ietf.org; Thu, 12 Jul 2007 05:06:38 -0400 Received: from esebh106.NOE.Nokia.com (esebh106.ntc.nokia.com [172.21.138.213]) by mgw-ext13.nokia.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id l6C95nLG009625; Thu, 12 Jul 2007 12:05:56 +0300 Received: from esebh103.NOE.Nokia.com ([172.21.143.33]) by esebh106.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 12:05:08 +0300 Received: from mgw-int01.ntc.nokia.com ([172.21.143.96]) by esebh103.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 12:05:07 +0300 Received: from [172.21.34.172] (esdhcp034172.research.nokia.com [172.21.34.172]) by mgw-int01.ntc.nokia.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id l6C956Ki008671; Thu, 12 Jul 2007 12:05:06 +0300 In-Reply-To: <1183673076.3274.47.camel@neutrino> References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.domain1.systemhost.net> <0172B5B5-3540-4ABF-A341-0DD4C20B8AF5@nokia.com> <1183673076.3274.47.camel@neutrino> Mime-Version: 1.0 (Apple Message framework v752.3) Message-Id: <58E59A13-109E-44F4-8EFE-413352DCBF14@nokia.com> From: Lars Eggert Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Thu, 12 Jul 2007 12:05:04 +0300 To: ext Steven Blake X-Mailer: Apple Mail (2.752.3) X-OriginalArrivalTime: 12 Jul 2007 09:05:07.0810 (UTC) FILETIME=[BE5FBC20:01C7C463] X-Nokia-AV: Clean X-Spam-Score: 0.0 (/) X-Scan-Signature: cd26b070c2577ac175cd3a6d878c6248 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0771267509==" Errors-To: pcn-bounces@ietf.org --===============0771267509== Content-Type: multipart/signed; micalg=sha1; boundary=Apple-Mail-1--234525319; protocol="application/pkcs7-signature" --Apple-Mail-1--234525319 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed On 2007-7-6, at 1:04, ext Steven Blake wrote: > I was not involved with the BOF, but by my reading of charter, I don't > see anything implying such a restriction; and it is certainly a > whopper > of a restriction! > > Dedicating one (or more) DS behavior aggregate(s) for PCN-managed > traffic makes perfect sense, but assuming that either AF or EF PHBs > are > used to service the PCN-managed BA, that BA will have a guaranteed > minimal service rate at each router link that will protect the BA > service from variations in best-effort traffic load. I checked the notes from the BOF, and apparently I was misremembering things. The topic of how to deal with non-PCN traffic was discussed and the idea was to address it through DiffServ classes. So please ignore those comments in my review of the architecture draft. Lars --Apple-Mail-1--234525319 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name=smime.p7s Content-Disposition: attachment; filename=smime.p7s MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGQDCCAvkw ggJioAMCAQICEGtxkLFHQu1g67hlmYfwPuIwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UEBhMCWkEx JTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQ ZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA3MDEwNDE2MTE1NFoXDTA4MDEwNDE2MTE1 NFowXDEPMA0GA1UEBBMGRWdnZXJ0MQ0wCwYDVQQqEwRMYXJzMRQwEgYDVQQDEwtMYXJzIEVnZ2Vy dDEkMCIGCSqGSIb3DQEJARYVbGFycy5lZ2dlcnRAbm9raWEuY29tMIIBIjANBgkqhkiG9w0BAQEF AAOCAQ8AMIIBCgKCAQEA26hjntVPZMiwh4d8tyuk9KiucvG92BVUGArk5zO1jhmq7tLFgU1mqcIg VGumfQqjkAzIuh83kxIiqBrB05Wvxp85apwt4sUCvzMe8mQWzZZZYp0rBzwpOj+VC5pxsMRYtYW+ BaTFBEmvFr7D7C7roZUk0lDppS5SZFs4SQbEe9ykB9aeUf1iTiw2+ikyP2+JEYto14WYCoxFWbms FbQ1uaaK+yn1WH2YHhyMfi0IOxuT0jtbsngjHJMpWIqq334zBhj+rPSUug47YBHr41FCDMHbbbjv WbyTyDYneOW3WY8LY8bGWVlAknQGB7lgduShe6e0RI/7SL/VE6X27lM9LwIDAQABozIwMDAgBgNV HREEGTAXgRVsYXJzLmVnZ2VydEBub2tpYS5jb20wDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQUF AAOBgQCx3nxxTg/WowobVTRXBiXUEEZj4LBiunWbuAnR0UbJIgijvq3JbiJvZo2gUGiW9LPaHSBz 4oxT1VR/S/6O0a4e87oV5cOQm6ReB68o9rDfUzxHTwoCfv2wwMwBrXyzQMjyQK4Lt8siV41gmZpm rSXMhjTJdd9uYYNoZKQLq+VM+TCCAz8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAwgdExCzAJ BgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2VydmljZXMg RGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkGCSqGSIb3 DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMzA3MTcwMDAwMDBaFw0xMzA3 MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5 KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQTCBnzAN BgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV+065yplaHmjAdQRwnd/p/6Me7L3N9VvyGna9 fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqqP3FWy688Cwfn8R+RNiQqE88r1fOCdz0Dviv+ uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEEQB5kGXJgt/sCAwEAAaOBlDCBkTASBgNVHRMB Af8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2oDSGMmh0dHA6Ly9jcmwudGhhd3RlLmNvbS9UaGF3 dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3JsMAsGA1UdDwQEAwIBBjApBgNVHREEIjAgpB4wHDEaMBgG A1UEAxMRUHJpdmF0ZUxhYmVsMi0xMzgwDQYJKoZIhvcNAQEFBQADgYEASIzRUIPqCy7MDaNmrGcP f6+svsIXoUOWlJ1/TCG4+DYfqi2fNi/A9BxQIJNwPP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH 2ydxVyWN3amcOY6MIE9lX5Xa9/eH1sYITq726jTlEBpbNU1341YheILcIRk13iSx0x1G/11fZU8x ggMQMIIDDAIBATB2MGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAo UHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIQ a3GQsUdC7WDruGWZh/A+4jAJBgUrDgMCGgUAoIIBbzAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcB MBwGCSqGSIb3DQEJBTEPFw0wNzA3MTIwOTA1MDVaMCMGCSqGSIb3DQEJBDEWBBTdQm2ri8uJMlbi IQCr7w6ogDNdAjCBhQYJKwYBBAGCNxAEMXgwdjBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhh d3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0ECEGtxkLFHQu1g67hlmYfwPuIwgYcGCyqGSIb3DQEJEAILMXigdjBiMQsw CQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UE AxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEGtxkLFHQu1g67hlmYfwPuIw DQYJKoZIhvcNAQEBBQAEggEA1E+DtIETQjiAh5cH2YsBCqXtHVf0hUbKyiDyi7dUbeyOGIYGB2se u5zmUaIlTJnbF4m+ky/U6i9bWCj6sM4icjQCT8SavAI1G/VlCeEcI3h1oQh9UEMxGPqDUZ5aT4ta 5+VwhcixwJQ0wcdxuUhtg+nUouoWZs6Grb+0GZnccY356ybL3ppSCCIpdsh90Y39FmxwtdkeAYx0 6a028ACcNaiXsst3PI0eU7wUZaJ9X27YCONeFBwfEgiOA8FyCyqFb2uU2THFzA/R+1MWq8VJ1DKu o7/1OGpZCTmgLuwlGWvLf1ZMO+tyLivQ46fb27tmRMRalt1wA1fOhrgXhmAXLAAAAAAAAA== --Apple-Mail-1--234525319-- --===============0771267509== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0771267509==-- From pcn-bounces@ietf.org Thu Jul 12 06:09:45 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8vcH-00015a-Ah; Thu, 12 Jul 2007 06:09:45 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8vcF-00015U-Bv for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 06:09:43 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8vcE-00015E-Vr for pcn@ietf.org; Thu, 12 Jul 2007 06:09:42 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I8vcA-0005YD-Eq for pcn@ietf.org; Thu, 12 Jul 2007 06:09:42 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 11:09:09 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] RE: Pre-congestion and ECN Date: Thu, 12 Jul 2007 11:08:58 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC308@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] RE: Pre-congestion and ECN Thread-Index: AcfDC2oE4qnbZ8AsT5aW2qNywC8UoQAdl25wADqwn5A= From: To: , , X-OriginalArrivalTime: 12 Jul 2007 10:09:09.0494 (UTC) FILETIME=[B0323160:01C7C46C] X-Spam-Score: 0.2 (/) X-Scan-Signature: 00e94c813bef7832af255170dca19e36 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Michael - re your original point will try & add "pre-congestion" to = terminology on lines you suggest phil > -----Original Message----- > From: Charzinski, Joachim [mailto:joachim.charzinski@nsn.com] > Sent: 11 July 2007 07:13 > To: menth@informatik.uni-wuerzburg.de; pcn@ietf.org > Subject: [PCN] RE: Pre-congestion and ECN >=20 > Hi Michael, >=20 > > Congestion observed in real queues by ECN can be seen as a > > special form > > of "pre-congestion", namely with regard to the link rate R=3DC. It = is > > possible to view it as such, but I find it a bit pathologic > > because the > > "pre-" is not really met since R=3DC and not R > > > This makes the difference between PCN and ECN explicit: ECN starts > > marking packets when real queueing (=3Dcongestion) occurs while PCN > > already marks packets when pre-congestion occurs, i.e., when > > a rate R > is exceeded and no physical queues arise. >=20 > Isn't this also a question of time scales? ECN would diagnose > "congestion" (which from the way ECN works should mostly be > considered pre-congestion) when a queue is found significantly > filled. This can happen also when R mean values but R>C during the very recent (mostly less than 1s) > past. > As I understood it, PCN is supposed to cover the longer time scales. > Thus, in PCN notation, ECN would actually signal pre-congestion in > most cases. >=20 > Best regards >=20 > Joachim. >=20 > ---------------------------------------------------------- > Nokia Siemens Networks >=20 > Joachim Charzinski > Principal Innovator >=20 > Machtlfinger Str. 1 > D-81379 Muenchen > Germany > Tel: +49 89 722 46803 >=20 > Joachim.Charzinski@nsn.com > http://www.nokiasiemensnetworks.com/global/ >=20 > Think before you print >=20 > Nokia Siemens Networks GmbH & Co. KG - Sitz der Gesellschaft: = M=FCnchen / > Registered office: Munich - Registergericht: M=FCnchen / Commercial > registry: Munich, HRA 88537 - WEEE-Reg.-Nr.: DE 52984304 - = Pers=F6nlich > haftende Gesellschafterin / General Partner: Nokia Siemens Networks > Management GmbH - Gesch=E4ftsleitung / Board of Directors: Joachim = Malterer, > Lydia Sommer - Sitz der Gesellschaft: M=FCnchen / Registered office: = Munich > - Registergericht: M=FCnchen / Commercial registry: Munich, HRB 163416 >=20 >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 06:44:00 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8w9Q-0005xk-GY; Thu, 12 Jul 2007 06:44:00 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8w9P-0005qa-FA for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 06:43:59 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8w9O-0005nn-J6 for pcn@ietf.org; Thu, 12 Jul 2007 06:43:58 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8w9O-0005n4-6N for pcn@ietf.org; Thu, 12 Jul 2007 06:43:58 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 11:43:24 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Terminology Date: Thu, 12 Jul 2007 11:43:24 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC309@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <46932AC5.2010909@informatik.uni-wuerzburg.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Terminology Thread-Index: AcfCviBGkjN2F3gqQq6d/csXd9t3OABrpBeQ From: To: , X-OriginalArrivalTime: 12 Jul 2007 10:43:24.0941 (UTC) FILETIME=[795683D0:01C7C471] X-Spam-Score: 0.0 (/) X-Scan-Signature: b132cb3ed2d4be2017585bf6859e1ede Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi It seems more intuitive to me that the terminology should come as "sets" of very similar terms that relate to the same mechanism. IE related terms should obviously be related without having to think about it:- admission control | configured-admissible-rate | admission-marking (& admission-marked-rate) termination control | configured-termination-rate | termination-marking I find it not instantly obvious that your suggested terms are related: {termination control | excess-traffic marking | supportable-rate}=20 A few more comments in-line Thanks phil > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] > Sent: 10 July 2007 07:44 > To: pcn@ietf.org > Subject: [PCN] Terminology >=20 > Hi, >=20 > I would like to discuss (again) some terminology for PCN. To get things > done quickly, we stuck in the architecture draft to the working > nomenclature from the CL draft and left the exact names for further > discussion. See Section 2 of > http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.tx t > We proposed an alternative nomenclature in Section 1.3 of > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt >=20 > The main differences are the following four names, all other terms are > fine: >=20 > "admissible rate" instead of "configured-admission-rate": [phil] the draft actually uses configured-admissible-rate. Dropping 'configured' would be ok with me.=20 > It's the rate that CAN be admitted. Then it is self-understood that the > rate is not measured but configured. >=20 > "supportable rate" instead of "configured-termination-rate": > It's the rate that CAN be supported. Then it is self-understood that the > rate is not measured but configured. Furthermore, an alternative action > for flow termination is rate reduction for which the name "termination" > is not appropriate. [phil] strictly it isn't the rate that can be supported; traffic can be supported up to the rate configured for the DS class used by the PCN traffic. It's the rate above which you start termination-marking pkts.=20 Perhaps we need something like terminatable-rate or terminatable-marking?! (I will be back) Yes, the charter says that after re-chartering the WG "may also consider to investigate additional response mechanisms that act on (pre-)congestion information". So your same point could be made that admission-marking is an inaccurate term, because in the future the WG might consider an action other than admission control. However, personally I don't think potential future charter should influence terminology. >=20 > "admission-stop marking" instead of "admission-marking": [phil] I don't object too much to admission-stop-marking (or admission-control-marking) instead of admission-marking. Personally I find the latter a bit simpler. > The meaning of the marking is that admission should be stopped. The name > "admission-marking" rather suggests the opposite.=20 [phil] isn't it self-understood that pkts are marked at higher traffic rates and not marked at low traffic rates? > This is also in line > with the single-marking approach. >=20 > "excess-traffic marking" instead of "termination-marking": > The name "termination-marking" is fine as long as flow termination is > the only option to reduce the rate of ingress-egress-aggregates when the > supportable rate of a link is exceeded. However, an alternative reaction > to this marking is flow rate reduction (although not in this charter). > Therefore, the name of that marking should be neutral with > regard to the action. >=20 > Regards, >=20 > Michael >=20 > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science > Am Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 07:24:27 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8wmZ-00062D-27; Thu, 12 Jul 2007 07:24:27 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8wmW-00060J-Pl for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 07:24:24 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8wmW-0005zd-8q for pcn@ietf.org; Thu, 12 Jul 2007 07:24:24 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8wmV-0006jc-Qv for pcn@ietf.org; Thu, 12 Jul 2007 07:24:24 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 12:23:50 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Probing in the presence of hash-based load balancing Date: Thu, 12 Jul 2007 12:23:49 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC30A@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <469328D9.60408@informatik.uni-wuerzburg.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Probing in the presence of hash-based load balancing Thread-Index: AcfCvRNR8PeL7n2bT4q7z89CEUq3IgBtTdTA From: To: , X-OriginalArrivalTime: 12 Jul 2007 11:23:50.0559 (UTC) FILETIME=[1F1E72F0:01C7C477] X-Spam-Score: 0.0 (/) X-Scan-Signature: 5ebbf074524e58e662bc8209a6235027 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, The points you make seem fair to me, however I have a couple of caveats. First, we shouldn't set harder requirements for probing than in the case where there is no probing.=20 Ie our assumption to date has been that probing is needed when there's not enough recent traffic between the specific PCN-ingress-node & PCN-egress-node (that the new flow would flow between), in order that we can make an accurate measurement-based admission decision. Note this is traffic between the ingress & egress - it isn't "on the specific ECMP path that the new flow would flow along". Some options: - we could say the adm decision is made on basis of measured traffic between the specific PCN-ingress-node & PCN-egress-node - we could say the adm decision is made on basis of measured traffic along the specific ECMP path - we could leave this question open for the operator to decide (the first is a MUST, the second is a MAY?) similarly the same set of options could be there for probing. The probing option chosen for probing should either be the same as for 'normal' adm ctrl or a weaker one (stronger doesn't make sense).=20 Secondly, we know (I think) from discussions over the last year or so that dealing with ECMP is quite tricky. It would be nice not to require complex things to be standardised /implemented. Currently the draft says that "Probing functions are optional". For instance the operator might not be using ecmp, or might not think it's a particular problem - perhaps they're prepared to risk the rare wrong adm decision (the flow termination mechanism handles such cases). However, we should discuss and think about how to deal with probing & ecmp more. Thirdly, it would also be nice to have some scenario analysis /data of how important this is (how often would probing be needed? How often would ecmp lead to focussed overload instead of a reasonably balanced traffic distribution?) Lastly, re your point 4 below. This is a good question. I believe the answer isn't the same for all vendors.=20 One specific question [slightly off topic of your email, as related to ecmp rather than probing specifically]: are the DS field & ECN field considered by the ecmp hash algos? If yes, that could mean that a pkt would travel a different ecmp path after it gets PCN-marked compared to if it stays unmarked; I'm not sure if this has any nasty implications for us, but we ought to think about it? Best wishes phil > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] > Sent: 10 July 2007 07:36 > To: pcn@ietf.org > Subject: [PCN] Probing in the presence of hash-based load balancing >=20 > Hi, >=20 > I would like to start a discussion regarding the probing mechanism. I > see the following constraints when equal-cost multipath (ECMP) routing > is used: >=20 > 1) Probe packets must have the same source and destination addresses as > well as source and destination ports as normal data packets because load > balancing algorithms compute a hash over relevant packet header entries > and depending on this hash value, they forward the packets to one of > several possible outgoing interfaces. This assures that all packets of > the same flow take the same route. >=20 > 2) PCN-based AC is a border-to-border solution. Therefore, PCN-related > signaling packets should not leave the network although equipped with > "wrong" source and destination addresses. Is that true? If not, why not? >=20 > 3) A standardized mechanism is required to encode probe packets that PCN > egress routers can recognize and intercept them, and to signal > appropriate feedback to the corresponding AC entities. >=20 > 4) I don't know the exact header fields used for the hash-based load > balancing. These fields should be the same for normal data packets and > probe packets to make sure that they all take the same path. Which > fields are typically used for that purpose? Those that are typically not > used might be changed to indicate that PCN packets are used for probing. >=20 > Are these assumptions correct? What mechanisms are possible? >=20 > Best wishes, >=20 > Michael >=20 > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science > Am Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 07:48:08 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8x9T-0008Nh-Ud; Thu, 12 Jul 2007 07:48:07 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8x9S-0008NU-KY for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 07:48:06 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8x9S-0008NM-94 for pcn@ietf.org; Thu, 12 Jul 2007 07:48:06 -0400 Received: from tcmail31.telekom.de ([217.6.95.238]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8x9R-0007Af-Nr for pcn@ietf.org; Thu, 12 Jul 2007 07:48:06 -0400 Received: from s4de8psaans.mitte.t-com.de by tcmail31.telekom.de with ESMTP; Thu, 12 Jul 2007 13:47:32 +0200 Received: from S4DE8PSAAFQ.mitte.t-com.de ([10.151.180.5]) by s4de8psaans.mitte.t-com.de with Microsoft SMTPSVC(6.0.3790.3959); Thu, 12 Jul 2007 13:47:31 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Subject: FW: [PCN] Terminology Date: Thu, 12 Jul 2007 13:47:31 +0200 Message-Id: <6439282641581441A36F7F6F83ED2ED201DB9957@S4DE8PSAAFQ.mitte.t-com.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Terminology thread-index: AcfCviBGkjN2F3gqQq6d/csXd9t3OABrpBeQAAL6j1A= From: "Geib, Ruediger" To: X-OriginalArrivalTime: 12 Jul 2007 11:47:31.0988 (UTC) FILETIME=[6E5B4D40:01C7C47A] X-Spam-Score: 0.0 (/) X-Scan-Signature: 3971661e40967acfc35f708dd5f33760 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Phil, -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] Sent: Thursday, July 12, 2007 12:43 PM To: menth@informatik.uni-wuerzburg.de; pcn@ietf.org Subject: RE: [PCN] Terminology Hi It seems more intuitive to me that the terminology should come as "sets" of very similar terms that relate to the same mechanism. IE related terms should obviously be related without having to think about it:- admission control | configured-admissible-rate | admission-marking (& admission-marked-rate) [Rudi]: I can live with almost all proposals containing "admission". Hoepfully=20 we all agree on one proposal soon. [/Rudi] termination control | configured-termination-rate | termination-marking [Rudi]: Termination may not be the best description, although I prefer it to=20 supportable rate. The aim of the termination is a "traffic/rate=20 reduction". The admission functionality more limits traffic to a=20 certain rate. Consulting my favorite online dictionary I'd like=20 to suggest: curb/mitigation/cutback control | configured-curbing/mitigation/cutback...=20 [/Rudi] Regards, Ruediger I find it not instantly obvious that your suggested terms are related: {termination control | excess-traffic marking | supportable-rate}=20 A few more comments in-line Thanks phil > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] > Sent: 10 July 2007 07:44 > To: pcn@ietf.org > Subject: [PCN] Terminology >=20 > Hi, >=20 > I would like to discuss (again) some terminology for PCN. To get things > done quickly, we stuck in the architecture draft to the working > nomenclature from the CL draft and left the exact names for further > discussion. See Section 2 of > http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.tx t > We proposed an alternative nomenclature in Section 1.3 of > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt >=20 > The main differences are the following four names, all other terms are > fine: >=20 > "admissible rate" instead of "configured-admission-rate": [phil] the draft actually uses configured-admissible-rate. Dropping 'configured' would be ok with me.=20 > It's the rate that CAN be admitted. Then it is self-understood that the > rate is not measured but configured. >=20 > "supportable rate" instead of "configured-termination-rate": > It's the rate that CAN be supported. Then it is self-understood that the > rate is not measured but configured. Furthermore, an alternative action > for flow termination is rate reduction for which the name "termination" > is not appropriate. [phil] strictly it isn't the rate that can be supported; traffic can be supported up to the rate configured for the DS class used by the PCN traffic. It's the rate above which you start termination-marking pkts.=20 Perhaps we need something like terminatable-rate or terminatable-marking?! (I will be back) Yes, the charter says that after re-chartering the WG "may also consider to investigate additional response mechanisms that act on (pre-)congestion information". So your same point could be made that admission-marking is an inaccurate term, because in the future the WG might consider an action other than admission control. However, personally I don't think potential future charter should influence terminology. >=20 > "admission-stop marking" instead of "admission-marking": [phil] I don't object too much to admission-stop-marking (or admission-control-marking) instead of admission-marking. Personally I find the latter a bit simpler. > The meaning of the marking is that admission should be stopped. The name > "admission-marking" rather suggests the opposite.=20 [phil] isn't it self-understood that pkts are marked at higher traffic rates and not marked at low traffic rates? > This is also in line > with the single-marking approach. >=20 > "excess-traffic marking" instead of "termination-marking": > The name "termination-marking" is fine as long as flow termination is > the only option to reduce the rate of ingress-egress-aggregates when the > supportable rate of a link is exceeded. However, an alternative reaction > to this marking is flow rate reduction (although not in this charter). > Therefore, the name of that marking should be neutral with > regard to the action. >=20 > Regards, >=20 > Michael >=20 > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science > Am Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 07:58:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8xJF-0003UE-5r; Thu, 12 Jul 2007 07:58:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8xJD-0003PV-V3 for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 07:58:11 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8xGB-0008KV-Uk for pcn@ietf.org; Thu, 12 Jul 2007 07:55:03 -0400 Received: from smtp2.smtp.bt.com ([217.32.164.150]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I8x79-0007ph-Hy for pcn@ietf.org; Thu, 12 Jul 2007 07:45:48 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 12:45:38 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Thu, 12 Jul 2007 12:45:38 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC30B@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <010201c7c36f$5af23f40$864c460a@china.huawei.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: AcfDcDTnwAO5MeptQ86cnfmalRpjDwBCVTdA From: To: , X-OriginalArrivalTime: 12 Jul 2007 11:45:38.0659 (UTC) FILETIME=[2ACEAB30:01C7C47A] X-Spam-Score: 0.2 (/) X-Scan-Signature: cd3d702b63698072ba67a75ce9e0fc9e Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Tina Thanks Your changes in S1 & S2 seem good to me. You made a comment in S5.4, but didn't suggest a text change. I think your comment doesn't need any change to S4 (ie it's already covered either in S5.4 [option of centralised node making decision] or earlier [ingress node doing policing]. is that ok? Thanks Phil/=20 > -----Original Message----- > From: Tina TSOU [mailto:tena@huawei.com] > Sent: 11 July 2007 04:56 > To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R > Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >=20 > Hi Phil, > I made some proposed specific changes with revised mark together with > comments in the attachment. > Hope it helps:) >=20 > B. R. > Tina >=20 > ----- Original Message ----- > From: > To: ; > Sent: Monday, July 09, 2007 8:16 PM > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt >=20 >=20 > Tina > Thanks > I'm not sure I completely understand your comments, sorry. >=20 > Is the problem that at the moment the draft only describes the Pull > model and not the Push model? Which lines of text need changing? > (somewhere in Section 5.4 or section 7 or somewhere else?) >=20 > Thanks! > phil >=20 > > -----Original Message----- > > From: Tina TSOU [mailto:tena@huawei.com] > > Sent: 02 July 2007 04:38 > > To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R > > Subject: Re: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt > > > > Hi all, > > One of the scenarios I am suggesting is below. > > > > Even in Pull mode, application layer QoS request (via RSVP) should be > also > > sent from ingress to the centralized node, in centralized node the > policy > > is > > generated, then the decision is made, and then delivers to the Ingress > to > > enforce. I was not saying that the policy is directly generated in the > > Ingress. Even the rather that Push mode should be also taken into > account. > > > > I.e. we define the centralized node locates in the transport control > > layer; > > the Ingress and Egress locate in transport layer. For the > implementation > > of > > physical entities, they are service policy server and PCN-enabled > router > > respectively. > > > > The centralized node is policy decision node, it should be based on > (1) > > Egress measurement result (2) operator's policies (could be configured > in > > the centralized node) (3) QoS request coming from the application > layer > > (PUSH or PULL mode), to make the decision, and decide which flows > should > > be > > admitted or reject, which flows should be stopped temperately or > > downgraded, > > which flows should be done policing. The generated policy should be > sent > > to > > ingress for enforcement. > > > > Ingress is the policy enforcement point, it based on the policy > delivered > > by > > the centralized node, (1) it allows flow pass or filter flow, (2) for > the > > flows allowed to pass, it makes policing and coloring based on the > policy. > > > > Referrence: > > QoS "Push" Model: model where the centralised node "pushes" traffic > > policies > > to the transport functions to enforce its policy decisions. > > NOTE: In this model, the CPE does not itself support native > application > > independent QoS procedures. > > QoS "Pull" Model: model where, upon request from the transport > processing > > functions, the centralised node provides traffic policies to the > transport > > processing functions. The request from the transport processing > functions > > may itself, for example, be triggered by path-coupled requests coming > from > > user equipment and/or transport network elements. > > > > > > B. R. > > Tina > > > > ----- Original Message ----- > > From: > > To: > > Sent: Thursday, June 28, 2007 11:59 PM > > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt > > > > > > Hi all, > > > > Just a reminder that all comments on this draft would be great. It > aims > > to describe the PCN architecture, in light of the PCN WG's Charter & > its > > Milestone of an Info doc on 'Flow Admission and Termination > Architecture > > within a Diffserv Domain' (due Nov 07). > > > > S1 Introduction. > > This is quite short. If desired, it could be boosted with a general > > explanation of where PCN fits into the picture of QoS and how it's > > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) > > > > S2 Terminology > > In the "Editor's note" are 3 alternative terms that some of the > authors > > preferred. > > > > S3 Assumptions and constraints on scope > > These are the 4 things mentioned in the Charter, plus some explanation > > of them. Are they clear? Also we mention some of the ways that a > future > > revised Charter might look at overcoming some of the > > constraints/assumptions; is this sub-section at the right depth? > > > > S4 High-level functional architecture > > We have tried to write this section (and the following ones) so that > it > > fits all the various proposals there've been for PCN mechanisms. Does > > this make the section too wishy-washy or too hard to understand? > Should > > it include some comparison of the different mechanisms proposed > > (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? > > > > S5 Detailed Functional architecture > > Is this a reasonable description of the extra functionality that PCN > > requires on various nodes in the PCN-domain? Is it the right way to > > split up the description? For clarity / help reader's understanding, > > should there be some specific examples of how functionality might be > > distributed (eg "if you followed the deployment model in > > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made > at > > the PCN-egress-node, communicated to the PCN-ingress-nodes which makes > > the admission decision; etc.") > > > > S6 Design goals and challenges > > This briefly describes some open issues, taken from > > briscoe-tsvwg-cl-architecture. Are there other ones that should be > > mentioned? Is the problem description at the right level of depth? > > Should we discuss various possible solutions to these problems? > > > > S7 Deployment scenarios > > Briefly describes some deployment scenarios for pcn? is this at the > > right level of depth? > > > > S8 Operations and Management > > This section was written in response to the Charter saying that the > > architecture document should include security, manageability and > > operational considerations. The draft addresses this by providing some > > thoughts under the FCAPS headings: OAM of Faults, Configuration, > > Accounting, Performance and Security? Is this the right way of > > structuring it - does it cover the right set of topics? Is the text at > > the right level? - eg should it also have a detailed set of parameters > > that would be available for configuration? > > > > An overall question is whether the draft should have more comparison > of > > the options (pros/cons) for various aspects. > > > > I aim to edit another version of the draft before the ietf (but maybe > > not before the deadline as I'm on hols next week). > > > > Thanks! > > Phil/ > > > > > > > -----Original Message----- > > > From: Kwok-Ho Chan [mailto:khchan@nortel.com] > > > Sent: 22 June 2007 04:38 > > > To: pcn@ietf.org > > > Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > > > > Hi all: > > > Please see the attached E-Mail on the posting of the PCN > Architecture > > > draft. > > > On behave of the editor of this draft: Phil, and the co-authors of > > this > > > draft, > > > we would like to request for reviews and comments of this draft and > > > welcome > > > any comments for improvements. > > > > > > Please send your comments/discussions of this draft on the PCN list. > > > > > > Thank you for your interest and review of this draft! > > > -- Kwok on behave of the co-authors of this draft -- > > > > > > > > > >To: i-d-announce@ietf.org > > > >Cc: > > > >From: Internet-Drafts@ietf.org > > > >Date: Thu, 21 Jun 2007 15:50:02 -0400 > > > >X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 > > > >Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > >X-BeenThere: i-d-announce@ietf.org > > > >X-Mailman-Version: 2.1.5 > > > >Reply-To: internet-drafts@ietf.org > > > >List-Id: i-d-announce.ietf.org > > > >List-Unsubscribe: > > , > > > > > > > >List-Archive: > > > >List-Post: > > > >List-Help: > > > >List-Subscribe: > > , > > > > > > > >X-Spam-Tests: = FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, > > > > NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D4 > > > >X-Spam-Score: 5.3 > > > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > > > ecarhea1.nortel.com > > > >X-DNSBL-Score: -50 > > > >X-DNSBL-Servers: bl.nortel.com > > > >X-SMTP-HELO: megatron.ietf.org > > > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > > > >X-SMTP-RCPT-TO: > > > > > > >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel > > .c > > > > > > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel > > .c > > > > > > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c > > om > > > >X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] > > > >X-SMTP-REASON: PASSED > > > >X-SMTP-ID: 1182455563.14011407 > > > >X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) > > > >FILETIME=3D[BC4965C0:01C7B43D] > > > > > > > >A New Internet-Draft is available from the on-line Internet-Drafts > > > >directories. > > > > > > > > > > > > Title : Pre-Congestion Notification Architecture > > > > Author(s) : P. Eardley, et al. > > > > Filename : draft-eardley-pcn-architecture-00.txt > > > > Pages : 27 > > > > Date : 2007-6-21 > > > > > > > > The purpose of this document is to describe a general > > architecture > > > > for flow admission and termination based on aggregated (pre-) > > > > congestion information in order to protect the quality of > service > > of > > > > established inelastic flows within a single DiffServ domain. > > > > > > > > > > > >A URL for this Internet-Draft is: > > > > > > >http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t > > xt > > > > > > > >To remove yourself from the I-D Announcement list, send a message > to > > > >i-d-announce-request@ietf.org with the word unsubscribe in the body > > of > > > >the message. > > > >You can also visit > > https://www1.ietf.org/mailman/listinfo/I-D-announce > > > >to change your subscription settings. > > > > > > > >Internet-Drafts are also available by anonymous FTP. Login with the > > > >username "anonymous" and a password of your e-mail address. After > > > >logging in, type "cd internet-drafts" and then > > > >"get draft-eardley-pcn-architecture-00.txt". > > > > > > > >A list of Internet-Drafts directories can be found in > > > >http://www.ietf.org/shadow.html > > > >or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > > > > > > >Internet-Drafts can also be obtained by e-mail. > > > > > > > >Send a message to: > > > > mailserv@ietf.org. > > > >In the body type: > > > > "FILE > > /internet-drafts/draft-eardley-pcn-architecture-00.txt". > > > > > > > >NOTE: The mail server at ietf.org can return the document in > > > > MIME-encoded form by using the "mpack" utility. To use > this > > > > feature, insert the command "ENCODING mime" before the > > "FILE" > > > > command. To decode the response(s), you will need > "munpack" > > or > > > > a MIME-compliant mail reader. Different MIME-compliant > mail > > > readers > > > > exhibit different behavior, especially when dealing with > > > > "multipart" MIME messages (i.e. documents which have been > > split > > > > up into multiple messages), so check your local > > documentation on > > > > how to manipulate these messages. > > > > > > > >Below is the data which will enable a MIME compliant mail reader > > > >implementation to automatically retrieve the ASCII version of the > > > >Internet-Draft. > > > > > > > >Content-Type: text/plain > > > >Content-ID: <2007-6-21120238.I-D@ietf.org> > > > > > > > >ENCODING mime > > > >FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt > > > > > > > > > > > > > > 00.txt> > > > >_______________________________________________ > > > >I-D-Announce mailing list > > > >I-D-Announce@ietf.org > > > >https://www1.ietf.org/mailman/listinfo/i-d-announce > > > > > > > > > > > > > > > _______________________________________________ > > > PCN mailing list > > > PCN@ietf.org > > > https://www1.ietf.org/mailman/listinfo/pcn > > > > > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 08:27:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8xlJ-0005Lc-BO; Thu, 12 Jul 2007 08:27:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8xlH-0005LM-SB for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 08:27:11 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8xlH-0005LA-Gl for pcn@ietf.org; Thu, 12 Jul 2007 08:27:11 -0400 Received: from smtp3.smtp.bt.com ([217.32.164.138]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8xl2-00087O-5z for pcn@ietf.org; Thu, 12 Jul 2007 08:27:11 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp3.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 13:26:20 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Replacing corrupted version of draft-charny-pcn-single-marking Date: Thu, 12 Jul 2007 13:26:20 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC30C@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Replacing corrupted version of draft-charny-pcn-single-marking Thread-Index: AcfDEXhVrgHLATEZREaxP0j75jQ2xwAAAeFwAFqA71A= From: To: , X-OriginalArrivalTime: 12 Jul 2007 12:26:20.0780 (UTC) FILETIME=[DA6CC2C0:01C7C47F] X-Spam-Score: 0.0 (/) X-Scan-Signature: 50a516d93fd399dc60588708fd9a3002 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Anna I read S4 of your doc, which is about how your draft impacts the architecture draft [thanks for the specific section btw!] My proposal would be to add to the arch draft into S5.6 (Flow termination functions) another paragraph that says something like: One particular proposal [ref] for PCN-marking and performing flow admission and termination would require a global parameter (*) to be defined on all PCN-boundary-nodes in the PCN-domain. [ref] discusses in full the impact of this particular proposal on the operation of PCN. OK? (*) Nb global parameter =3D U in your draft. (the Flow termination section seems the right place to include the above, since it's the calculation of sustainable-aggregate-rate that's changed by the U factor.) (the impact on the measurement/reaction at the PCN-boundary-nodes is really something for the draft(s) on boundary mechanisms to cover, rather than the architecture draft.) I don't think we need to add mention of the MARKING-MODE config parameter - partly because as you say it can be deduced from the value of U; mainly because having this parameter may suggest that several marking modes are to be standardised, whereas we're trying to standardise just one. Thanks Phil/ =20 > -----Original Message----- > From: Anna Charny (acharny) [mailto:acharny@cisco.com] > Sent: 10 July 2007 17:53 > To: pcn@ietf.org > Subject: [PCN] Replacing corrupted version of draft-charny-pcn-single- > marking >=20 > Hi all, >=20 > It appears that the version of the Single Marking draft that was sent > yesterday somehow got corrupted. Please find the new version (it was > also reposted to the ietf-drafts@ietf.org, but will take some time > propagating). Sorry for any inconvenience this may have caused. >=20 > Anna _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 08:53:41 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8yAv-0002C4-Hl; Thu, 12 Jul 2007 08:53:41 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I8yAu-0002Bw-Bf for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 08:53:40 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I8yAu-0002Bo-0o for pcn@ietf.org; Thu, 12 Jul 2007 08:53:40 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I8yAt-0000E3-Gu for pcn@ietf.org; Thu, 12 Jul 2007 08:53:39 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id C59B675BB; Thu, 12 Jul 2007 14:53:30 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id A85417FCC; Thu, 12 Jul 2007 14:53:30 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 6D01675BB; Thu, 12 Jul 2007 14:53:30 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6CCrUk22573; Thu, 12 Jul 2007 14:53:30 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 419BB6F58E; Thu, 12 Jul 2007 14:47:52 +0200 (CEST) Message-ID: <46962380.4070509@informatik.uni-wuerzburg.de> Date: Thu, 12 Jul 2007 14:50:08 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: philip.eardley@bt.com Subject: Re: [PCN] RE: Pre-congestion and ECN References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC308@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC308@E03MVZ1-UKDY.domain1.systemhost.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Scan-Signature: a7d2e37451f7f22841e3b6f40c67db0f Cc: pcn@ietf.org, joachim.charzinski@nsn.com X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil, here is a compact summary regarding your question about the relation=20 between PCN and ECN taking Joachim's comments into account. As you had=20 that question, therefore this might be useful for the draft. "ECN signals congestion using ECN-marking when the line rate C is exceeded by the current traffic and physical queuing occurs. PCN signals pre-congestion using PCN-marking when a configured rate R Michael - re your original point will try & add "pre-congestion" to ter= minology on lines you suggest > > phil > > =20 >> -----Original Message----- >> From: Charzinski, Joachim [mailto:joachim.charzinski@nsn.com] >> Sent: 11 July 2007 07:13 >> To: menth@informatik.uni-wuerzburg.de; pcn@ietf.org >> Subject: [PCN] RE: Pre-congestion and ECN >> >> Hi Michael, >> >> =20 >>> Congestion observed in real queues by ECN can be seen as a >>> special form >>> of "pre-congestion", namely with regard to the link rate R=3DC. It is >>> possible to view it as such, but I find it a bit pathologic >>> because the >>> "pre-" is not really met since R=3DC and not R>> >>> This makes the difference between PCN and ECN explicit: ECN starts >>> marking packets when real queueing (=3Dcongestion) occurs while PCN >>> already marks packets when pre-congestion occurs, i.e., when >>> a rate R>> is exceeded and no physical queues arise. >>> =20 >> Isn't this also a question of time scales? ECN would diagnose >> "congestion" (which from the way ECN works should mostly be >> considered pre-congestion) when a queue is found significantly >> filled. This can happen also when R> mean values but R>C during the very recent (mostly less than 1s) >> past. >> As I understood it, PCN is supposed to cover the longer time scales. >> Thus, in PCN notation, ECN would actually signal pre-congestion in >> most cases. >> >> Best regards >> >> Joachim. >> >> ---------------------------------------------------------- >> Nokia Siemens Networks >> >> Joachim Charzinski >> Principal Innovator >> >> Machtlfinger Str. 1 >> D-81379 Muenchen >> Germany >> Tel: +49 89 722 46803 >> >> Joachim.Charzinski@nsn.com >> http://www.nokiasiemensnetworks.com/global/ >> >> Think before you print >> >> Nokia Siemens Networks GmbH & Co. KG - Sitz der Gesellschaft: M=FCnche= n / >> Registered office: Munich - Registergericht: M=FCnchen / Commercial >> registry: Munich, HRA 88537 - WEEE-Reg.-Nr.: DE 52984304 - Pers=F6nlic= h >> haftende Gesellschafterin / General Partner: Nokia Siemens Networks >> Management GmbH - Gesch=E4ftsleitung / Board of Directors: Joachim Mal= terer, >> Lydia Sommer - Sitz der Gesellschaft: M=FCnchen / Registered office: M= unich >> - Registergericht: M=FCnchen / Commercial registry: Munich, HRB 163416 >> >> >> >> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> =20 --=20 Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 11:14:47 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I90NS-0005he-PO; Thu, 12 Jul 2007 11:14:46 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I90NR-0005hW-BP for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 11:14:45 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I90NR-0005hO-1u for pcn@ietf.org; Thu, 12 Jul 2007 11:14:45 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I90NM-0005HV-Gn for pcn@ietf.org; Thu, 12 Jul 2007 11:14:45 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 12 Jul 2007 16:14:39 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Replacing corrupted version ofdraft-charny-pcn-single-marking Date: Thu, 12 Jul 2007 16:14:39 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC313@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC30C@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Replacing corrupted version ofdraft-charny-pcn-single-marking Thread-Index: AcfDEXhVrgHLATEZREaxP0j75jQ2xwAAAeFwAFqA71AABt+00A== From: To: X-OriginalArrivalTime: 12 Jul 2007 15:14:39.0987 (UTC) FILETIME=[5E057430:01C7C497] X-Spam-Score: 0.2 (/) X-Scan-Signature: 6cca30437e2d04f45110f2ff8dc1b1d5 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Just to clarify. My intent is to include the suggested text below into the architecture doc (S5.6)- please shout if you think this is not good! Thanks Phil << One particular proposal [ref] for PCN-marking and performing flow admission and termination would require a global parameter to be defined on all PCN-boundary-nodes in the PCN-domain. [ref] discusses in full the impact of this particular proposal on the operation of PCN.>> > -----Original Message----- > From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] > Sent: 12 July 2007 13:26 > To: acharny@cisco.com; pcn@ietf.org > Subject: RE: [PCN] Replacing corrupted version ofdraft-charny-pcn-single- > marking >=20 > Anna >=20 > I read S4 of your doc, which is about how your draft impacts the > architecture draft [thanks for the specific section btw!] >=20 > My proposal would be to add to the arch draft into S5.6 (Flow > termination functions) another paragraph that says something like: >=20 > One particular proposal [ref] for PCN-marking and performing flow > admission and termination would require a global parameter (*) to be > defined on all PCN-boundary-nodes in the PCN-domain. [ref] discusses in > full the impact of this particular proposal on the operation of PCN. >=20 > OK? >=20 > (*) Nb global parameter =3D U in your draft. >=20 >=20 > (the Flow termination section seems the right place to include the > above, since it's the calculation of sustainable-aggregate-rate that's > changed by the U factor.) > (the impact on the measurement/reaction at the PCN-boundary-nodes is > really something for the draft(s) on boundary mechanisms to cover, > rather than the architecture draft.) >=20 > I don't think we need to add mention of the MARKING-MODE config > parameter - partly because as you say it can be deduced from the value > of U; mainly because having this parameter may suggest that several > marking modes are to be standardised, whereas we're trying to > standardise just one. >=20 > Thanks > Phil/ >=20 > > -----Original Message----- > > From: Anna Charny (acharny) [mailto:acharny@cisco.com] > > Sent: 10 July 2007 17:53 > > To: pcn@ietf.org > > Subject: [PCN] Replacing corrupted version of draft-charny-pcn-single- > > marking > > > > Hi all, > > > > It appears that the version of the Single Marking draft that was sent > > yesterday somehow got corrupted. Please find the new version (it was > > also reposted to the ietf-drafts@ietf.org, but will take some time > > propagating). Sorry for any inconvenience this may have caused. > > > > Anna >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 12 23:55:57 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9CG4-00019q-Pw; Thu, 12 Jul 2007 23:55:56 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I9CG3-00019l-4S for pcn-confirm+ok@megatron.ietf.org; Thu, 12 Jul 2007 23:55:55 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9CG2-00019d-Nu for pcn@ietf.org; Thu, 12 Jul 2007 23:55:54 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I9CFu-000255-Pg for pcn@ietf.org; Thu, 12 Jul 2007 23:55:54 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6D3sdp11719; Fri, 13 Jul 2007 03:54:40 GMT X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Probing in the presence of hash-based load balancing Date: Thu, 12 Jul 2007 23:54:20 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651140C8CC@zcarhxm1.corp.nortel.com> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC30A@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Probing in the presence of hash-based load balancing Thread-Index: AcfCvRNR8PeL7n2bT4q7z89CEUq3IgBtTdTAACHeupA= From: "Jozef Babiarz" To: , , X-Spam-Score: 0.0 (/) X-Scan-Signature: 8b6657e60309a1317174c9db2ae5f227 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Phil Eardley wrote on July 12, 2007. >First, we shouldn't set harder requirements for probing than in the case >where there is no probing.=20 >Ie our assumption to date has been that probing is needed when there's >not enough recent traffic between the specific PCN-ingress-node & >PCN-egress-node (that the new flow would flow between), in order that we >can make an accurate measurement-based admission decision. Note this is >traffic between the ingress & egress - it isn't "on the specific ECMP >path that the new flow would flow along". [Joe]My assumption is that probing is needed under the following conditions: a)when there is no traffic between ingress-egress nodes for that aggregate, b)when there may be ECMP or other methods that may provide multiple paths between ingress-egress nodes, c)if there is a need to verify that real-time media packets once admitted can infect reach the egress node. =20 >Some options: >- we could say the adm decision is made on basis of measured traffic >between the specific PCN-ingress-node & PCN-egress-node >- we could say the adm decision is made on basis of measured traffic >along the specific ECMP path >- we could leave this question open for the operator to decide (the >first is a MUST, the second is a MAY?) [Joe]I think we better say that adm decision is made on basis of a specific path.=20 >Lastly, re your point 4 below. This is a good question. I believe the >answer isn't the same for all vendors.=20 >One specific question [slightly off topic of your email, as related to >ecmp rather than probing specifically]: are the DS field & ECN field >considered by the ecmp hash algos? If yes, that could mean that a pkt >would travel a different ecmp path after it gets PCN-marked compared to >if it stays unmarked; I'm not sure if this has any nasty implications >for us, but we ought to think about it? [Joe]ECMP hash algorithms may use some or all of, source/destination IP address, source/destination port numbers, protocol ID and DSCP field. ECN field should not be used in hash algorithms. Michael Menth wrote on 10 July 2007 07:36 > 2) PCN-based AC is a border-to-border solution. Therefore, PCN-related > signaling packets should not leave the network although equipped with > "wrong" source and destination addresses. Is that true? If not, why not? [Joe]True. I believe that egress node would need to block from forwarding to next node probe packets in a border-to-border scenario. > 3) A standardized mechanism is required to encode probe packets that PCN > egress routers can recognize and intercept them, and to signal > appropriate feedback to the corresponding AC entities. [Joe]This is highly desirable. We need to define a probing method that works with ECMP and egress router can easily detect probe packets. >=20 > 4) I don't know the exact header fields used for the hash-based load > balancing. These fields should be the same for normal data packets and > probe packets to make sure that they all take the same path. Which > fields are typically used for that purpose? Those that are typically not > used might be changed to indicate that PCN packets are used for probing. [Joe] I believe ECN field in IP header could be used to signal to egress router that this packet needs further inspection. Upon further inspection the egress router determines that it is a probe packet.=20 Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com]=20 Sent: July 12, 2007 7:24 AM To: menth@informatik.uni-wuerzburg.de; pcn@ietf.org Subject: RE: [PCN] Probing in the presence of hash-based load balancing Hi, The points you make seem fair to me, however I have a couple of caveats. First, we shouldn't set harder requirements for probing than in the case where there is no probing.=20 Ie our assumption to date has been that probing is needed when there's not enough recent traffic between the specific PCN-ingress-node & PCN-egress-node (that the new flow would flow between), in order that we can make an accurate measurement-based admission decision. Note this is traffic between the ingress & egress - it isn't "on the specific ECMP path that the new flow would flow along". Some options: - we could say the adm decision is made on basis of measured traffic between the specific PCN-ingress-node & PCN-egress-node - we could say the adm decision is made on basis of measured traffic along the specific ECMP path - we could leave this question open for the operator to decide (the first is a MUST, the second is a MAY?) similarly the same set of options could be there for probing. The probing option chosen for probing should either be the same as for 'normal' adm ctrl or a weaker one (stronger doesn't make sense).=20 Secondly, we know (I think) from discussions over the last year or so that dealing with ECMP is quite tricky. It would be nice not to require complex things to be standardised /implemented. Currently the draft says that "Probing functions are optional". For instance the operator might not be using ecmp, or might not think it's a particular problem - perhaps they're prepared to risk the rare wrong adm decision (the flow termination mechanism handles such cases). However, we should discuss and think about how to deal with probing & ecmp more. Thirdly, it would also be nice to have some scenario analysis /data of how important this is (how often would probing be needed? How often would ecmp lead to focussed overload instead of a reasonably balanced traffic distribution?) Lastly, re your point 4 below. This is a good question. I believe the answer isn't the same for all vendors.=20 One specific question [slightly off topic of your email, as related to ecmp rather than probing specifically]: are the DS field & ECN field considered by the ecmp hash algos? If yes, that could mean that a pkt would travel a different ecmp path after it gets PCN-marked compared to if it stays unmarked; I'm not sure if this has any nasty implications for us, but we ought to think about it? Best wishes phil > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] > Sent: 10 July 2007 07:36 > To: pcn@ietf.org > Subject: [PCN] Probing in the presence of hash-based load balancing >=20 > Hi, >=20 > I would like to start a discussion regarding the probing mechanism. I > see the following constraints when equal-cost multipath (ECMP) routing > is used: >=20 > 1) Probe packets must have the same source and destination addresses as > well as source and destination ports as normal data packets because load > balancing algorithms compute a hash over relevant packet header entries > and depending on this hash value, they forward the packets to one of > several possible outgoing interfaces. This assures that all packets of > the same flow take the same route. >=20 > 2) PCN-based AC is a border-to-border solution. Therefore, PCN-related > signaling packets should not leave the network although equipped with > "wrong" source and destination addresses. Is that true? If not, why not? >=20 > 3) A standardized mechanism is required to encode probe packets that PCN > egress routers can recognize and intercept them, and to signal > appropriate feedback to the corresponding AC entities. >=20 > 4) I don't know the exact header fields used for the hash-based load > balancing. These fields should be the same for normal data packets and > probe packets to make sure that they all take the same path. Which > fields are typically used for that purpose? Those that are typically not > used might be changed to indicate that PCN packets are used for probing. >=20 > Are these assumptions correct? What mechanisms are possible? >=20 > Best wishes, >=20 > Michael >=20 > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science > Am Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 13 03:06:38 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9FEc-00080Q-BR; Fri, 13 Jul 2007 03:06:38 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I9FEb-00080J-1X for pcn-confirm+ok@megatron.ietf.org; Fri, 13 Jul 2007 03:06:37 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9FEX-0007sn-7i for pcn@ietf.org; Fri, 13 Jul 2007 03:06:33 -0400 Received: from tcmail31.telekom.de ([217.6.95.238]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I9FEI-0006xA-9q for pcn@ietf.org; Fri, 13 Jul 2007 03:06:33 -0400 Received: from S4DE8PSAANQ.mitte.t-com.de by tcmail31.telekom.de with ESMTP; Fri, 13 Jul 2007 09:05:46 +0200 Received: from S4DE8PSAAFQ.mitte.t-com.de ([10.151.180.5]) by S4DE8PSAANQ.mitte.t-com.de with Microsoft SMTPSVC(6.0.3790.3959); Fri, 13 Jul 2007 09:05:46 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Subject: FW: [PCN] Probing in the presence of hash-based load balancing Date: Fri, 13 Jul 2007 09:05:45 +0200 Message-Id: <6439282641581441A36F7F6F83ED2ED201DB9967@S4DE8PSAAFQ.mitte.t-com.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Probing in the presence of hash-based load balancing thread-index: AcfCvRNR8PeL7n2bT4q7z89CEUq3IgBtTdTAACHeupAAB0158A== From: "Geib, Ruediger" To: , X-OriginalArrivalTime: 13 Jul 2007 07:05:46.0590 (UTC) FILETIME=[3C5E07E0:01C7C51C] X-Spam-Score: 0.0 (/) X-Scan-Signature: 287c806b254c6353fcb09ee0e53bbc5e Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, some comments in line, marked [Rudi]. >First, we shouldn't set harder requirements for probing than in the >case where there is no probing.=20 >Ie our assumption to date has been that probing is needed when there's >not enough recent traffic between the specific PCN-ingress-node & >PCN-egress-node (that the new flow would flow between), in order that >we can make an accurate measurement-based admission decision. Note=20 >this is traffic between the ingress & egress - it isn't "on the=20 >specific ECMP path that the new flow would flow along". [Joe]My assumption is that probing is needed under the following conditions: a)when there is no traffic between ingress-egress nodes for that aggregate, b)when there may be ECMP or other methods that may provide multiple paths between ingress-egress nodes, c)if there is a need to verify that real-time media packets once admitted can infect reach the egress node.=20 [Rudi] Probing is only required if any border node of a PCN domain=20 provides pre-congestion feedback. If that's the case, a) is required. b) assumes ECMP "aware" probing. Phil mentioned ingress-egress above. So Phil's thinking about some basic functionality while Joe's having=20 a more advanced solution in mind (which is desireable, but harder=20 to realise). c) to me is not an aim, it is more something we can do it we=20 realise a) and b).=20 >Some options: >- we could say the adm decision is made on basis of measured traffic > between the specific PCN-ingress-node & PCN-egress-node >- we could say the adm decision is made on basis of measured traffic > along the specific ECMP path >- we could leave this question open for the operator to decide (the > first is a MUST, the second is a MAY?) [Joe]I think we better say that adm decision is made on basis of a specific path.=20 [Rudi]We can standardise an overly conservative solution if we agree=20 on MUST for the first. It is up to a provider to improve the=20 efficency of his operations and to ensure proper functionality of=20 PCN. The standard must insist on proper functionality and should=20 provide tools to improve efficiency. Looking at it from that angle,=20 Phil's suggestion on MUST for the first and MAY for the second is=20 allright. >Lastly, re your point 4 below. This is a good question. I believe the >answer isn't the same for all vendors.=20 >One specific question [slightly off topic of your email, as related to >ecmp rather than probing specifically]: are the DS field & ECN field >considered by the ecmp hash algos? If yes, that could mean that a pkt >would travel a different ecmp path after it gets PCN-marked compared to >if it stays unmarked; I'm not sure if this has any nasty implications >for us, but we ought to think about it? [Joe]ECMP hash algorithms may use some or all of, source/destination IP address, source/destination port numbers, protocol ID and DSCP field. ECN field should not be used in hash algorithms. Michael Menth wrote on 10 July 2007 07:36 > 2) PCN-based AC is a border-to-border solution. Therefore, PCN-related > signaling packets should not leave the network although equipped with > "wrong" source and destination addresses. Is that true? If not, why > not? [Joe]True. I believe that egress node would need to block from forwarding to next node probe packets in a border-to-border scenario. [Rudi] Agree to Joe and Michael. > 3) A standardized mechanism is required to encode probe packets that > PCN egress routers can recognize and intercept them, and to signal > appropriate feedback to the corresponding AC entities. [Joe]This is highly desirable. We need to define a probing method that works with ECMP and egress router can easily detect probe packets. [Rudi] Yes, that's desireable. > 4) I don't know the exact header fields used for the hash-based load > balancing. These fields should be the same for normal data packets and > probe packets to make sure that they all take the same path. Which > fields are typically used for that purpose? Those that are typically > not used might be changed to indicate that PCN packets are used for > probing. [Joe] I believe ECN field in IP header could be used to signal to egress router that this packet needs further inspection. Upon further inspection the egress router determines that it is a probe packet.=20 [Rudi] By that you define a "selective RAO", meaning that egress nodes=20 must interpret some IP header "codepoint" as RAO. The cool part of your=20 idea is that only some routers interpret this "codepoint" as RAO, not=20 all. Security demands to limit this option to a single domain of trust.=20 So an egress node must act differently on a packet received with that=20 codepoint, depending on the interface, where it is received (from=20 within PCN domain or from a PCN external interface). I like the idea. If more people provide support, we may contact=20 the WG chairs to see how our chances are to get that standardised=20 within IETF. I'm not sure, whether this is "just a PCN decision". Working on this proposal should however not delay work on the easier=20 to realise "ingress-egress" probing functionality. Regards, Ruediger _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 13 04:40:57 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9Ght-0000dz-Ts; Fri, 13 Jul 2007 04:40:57 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I9Ghs-0000Zd-Mf for pcn-confirm+ok@megatron.ietf.org; Fri, 13 Jul 2007 04:40:56 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9Ghs-0000Xf-8y for pcn@ietf.org; Fri, 13 Jul 2007 04:40:56 -0400 Received: from szxga04-in.huawei.com ([61.144.161.7]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I9Ghq-0001Na-KD for pcn@ietf.org; Fri, 13 Jul 2007 04:40:56 -0400 Received: from huawei.com (szxga04-in [172.24.2.12]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JL400CVA02EU0@szxga04-in.huawei.com> for pcn@ietf.org; Fri, 13 Jul 2007 16:39:50 +0800 (CST) Received: from huawei.com ([172.24.1.18]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JL400FSM02BVT@szxga04-in.huawei.com> for pcn@ietf.org; Fri, 13 Jul 2007 16:39:50 +0800 (CST) Received: from z24109a ([10.70.76.134]) by szxml03-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JL4008EN02BHK@szxml03-in.huawei.com> for pcn@ietf.org; Fri, 13 Jul 2007 16:39:47 +0800 (CST) Date: Fri, 13 Jul 2007 16:39:47 +0800 From: Tina TSOU Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt To: pcn@ietf.org, philip.eardley@bt.com Message-id: <004e01c7c529$5eae4a00$864c460a@china.huawei.com> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 Content-type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original Content-transfer-encoding: 7BIT X-Priority: 3 X-MSMail-priority: Normal References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC30B@E03MVZ1-UKDY.domain1.systemhost.net> X-Spam-Score: 0.0 (/) X-Scan-Signature: 916029c14bdb340aa234d3ec4cd24f52 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil, Thanks:) Wrt to section 5.4, I suggest as below. /*delete "policy and"*/ /*add "and relative QoS policies"*/ The decision is made at a centralised node, which requires that the PCN-egress-node signals to the centralised node about "the required measurements of PCN-traffic" (and that the centralised node learns about policy and application layer requirements), and that the centralised node signals to the PCN-ingress-node about the decision about admission control and relative QoS policies. It would be possible for the centralised node to be one of the PCN-boundary-nodes, when clearly the signalling would sometimes be replaced by a message internal to the node. B. R. Tina ----- Original Message ----- From: To: ; Sent: Thursday, July 12, 2007 7:45 PM Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Tina Thanks Your changes in S1 & S2 seem good to me. You made a comment in S5.4, but didn't suggest a text change. I think your comment doesn't need any change to S4 (ie it's already covered either in S5.4 [option of centralised node making decision] or earlier [ingress node doing policing]. is that ok? Thanks Phil/ > -----Original Message----- > From: Tina TSOU [mailto:tena@huawei.com] > Sent: 11 July 2007 04:56 > To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R > Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > Hi Phil, > I made some proposed specific changes with revised mark together with > comments in the attachment. > Hope it helps:) > > B. R. > Tina > > ----- Original Message ----- > From: > To: ; > Sent: Monday, July 09, 2007 8:16 PM > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > Tina > Thanks > I'm not sure I completely understand your comments, sorry. > > Is the problem that at the moment the draft only describes the Pull > model and not the Push model? Which lines of text need changing? > (somewhere in Section 5.4 or section 7 or somewhere else?) > > Thanks! > phil > > > -----Original Message----- > > From: Tina TSOU [mailto:tena@huawei.com] > > Sent: 02 July 2007 04:38 > > To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R > > Subject: Re: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt > > > > Hi all, > > One of the scenarios I am suggesting is below. > > > > Even in Pull mode, application layer QoS request (via RSVP) should be > also > > sent from ingress to the centralized node, in centralized node the > policy > > is > > generated, then the decision is made, and then delivers to the Ingress > to > > enforce. I was not saying that the policy is directly generated in the > > Ingress. Even the rather that Push mode should be also taken into > account. > > > > I.e. we define the centralized node locates in the transport control > > layer; > > the Ingress and Egress locate in transport layer. For the > implementation > > of > > physical entities, they are service policy server and PCN-enabled > router > > respectively. > > > > The centralized node is policy decision node, it should be based on > (1) > > Egress measurement result (2) operator's policies (could be configured > in > > the centralized node) (3) QoS request coming from the application > layer > > (PUSH or PULL mode), to make the decision, and decide which flows > should > > be > > admitted or reject, which flows should be stopped temperately or > > downgraded, > > which flows should be done policing. The generated policy should be > sent > > to > > ingress for enforcement. > > > > Ingress is the policy enforcement point, it based on the policy > delivered > > by > > the centralized node, (1) it allows flow pass or filter flow, (2) for > the > > flows allowed to pass, it makes policing and coloring based on the > policy. > > > > Referrence: > > QoS "Push" Model: model where the centralised node "pushes" traffic > > policies > > to the transport functions to enforce its policy decisions. > > NOTE: In this model, the CPE does not itself support native > application > > independent QoS procedures. > > QoS "Pull" Model: model where, upon request from the transport > processing > > functions, the centralised node provides traffic policies to the > transport > > processing functions. The request from the transport processing > functions > > may itself, for example, be triggered by path-coupled requests coming > from > > user equipment and/or transport network elements. > > > > > > B. R. > > Tina > > > > ----- Original Message ----- > > From: > > To: > > Sent: Thursday, June 28, 2007 11:59 PM > > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt > > > > > > Hi all, > > > > Just a reminder that all comments on this draft would be great. It > aims > > to describe the PCN architecture, in light of the PCN WG's Charter & > its > > Milestone of an Info doc on 'Flow Admission and Termination > Architecture > > within a Diffserv Domain' (due Nov 07). > > > > S1 Introduction. > > This is quite short. If desired, it could be boosted with a general > > explanation of where PCN fits into the picture of QoS and how it's > > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) > > > > S2 Terminology > > In the "Editor's note" are 3 alternative terms that some of the > authors > > preferred. > > > > S3 Assumptions and constraints on scope > > These are the 4 things mentioned in the Charter, plus some explanation > > of them. Are they clear? Also we mention some of the ways that a > future > > revised Charter might look at overcoming some of the > > constraints/assumptions; is this sub-section at the right depth? > > > > S4 High-level functional architecture > > We have tried to write this section (and the following ones) so that > it > > fits all the various proposals there've been for PCN mechanisms. Does > > this make the section too wishy-washy or too hard to understand? > Should > > it include some comparison of the different mechanisms proposed > > (PCN-interior-node marking algorithms & PCN-boundary-node reactions)? > > > > S5 Detailed Functional architecture > > Is this a reasonable description of the extra functionality that PCN > > requires on various nodes in the PCN-domain? Is it the right way to > > split up the description? For clarity / help reader's understanding, > > should there be some specific examples of how functionality might be > > distributed (eg "if you followed the deployment model in > > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made > at > > the PCN-egress-node, communicated to the PCN-ingress-nodes which makes > > the admission decision; etc.") > > > > S6 Design goals and challenges > > This briefly describes some open issues, taken from > > briscoe-tsvwg-cl-architecture. Are there other ones that should be > > mentioned? Is the problem description at the right level of depth? > > Should we discuss various possible solutions to these problems? > > > > S7 Deployment scenarios > > Briefly describes some deployment scenarios for pcn? is this at the > > right level of depth? > > > > S8 Operations and Management > > This section was written in response to the Charter saying that the > > architecture document should include security, manageability and > > operational considerations. The draft addresses this by providing some > > thoughts under the FCAPS headings: OAM of Faults, Configuration, > > Accounting, Performance and Security? Is this the right way of > > structuring it - does it cover the right set of topics? Is the text at > > the right level? - eg should it also have a detailed set of parameters > > that would be available for configuration? > > > > An overall question is whether the draft should have more comparison > of > > the options (pros/cons) for various aspects. > > > > I aim to edit another version of the draft before the ietf (but maybe > > not before the deadline as I'm on hols next week). > > > > Thanks! > > Phil/ > > > > > > > -----Original Message----- > > > From: Kwok-Ho Chan [mailto:khchan@nortel.com] > > > Sent: 22 June 2007 04:38 > > > To: pcn@ietf.org > > > Subject: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > > > > Hi all: > > > Please see the attached E-Mail on the posting of the PCN > Architecture > > > draft. > > > On behave of the editor of this draft: Phil, and the co-authors of > > this > > > draft, > > > we would like to request for reviews and comments of this draft and > > > welcome > > > any comments for improvements. > > > > > > Please send your comments/discussions of this draft on the PCN list. > > > > > > Thank you for your interest and review of this draft! > > > -- Kwok on behave of the co-authors of this draft -- > > > > > > > > > >To: i-d-announce@ietf.org > > > >Cc: > > > >From: Internet-Drafts@ietf.org > > > >Date: Thu, 21 Jun 2007 15:50:02 -0400 > > > >X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 > > > >Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > >X-BeenThere: i-d-announce@ietf.org > > > >X-Mailman-Version: 2.1.5 > > > >Reply-To: internet-drafts@ietf.org > > > >List-Id: i-d-announce.ietf.org > > > >List-Unsubscribe: > > , > > > > > > > >List-Archive: > > > >List-Post: > > > >List-Help: > > > >List-Subscribe: > > , > > > > > > > >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, > > > > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=4 > > > >X-Spam-Score: 5.3 > > > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > > > ecarhea1.nortel.com > > > >X-DNSBL-Score: -50 > > > >X-DNSBL-Servers: bl.nortel.com > > > >X-SMTP-HELO: megatron.ietf.org > > > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > > > >X-SMTP-RCPT-TO: > > > > > > >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel > > .c > > > > > > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel > > .c > > > > > > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c > > om > > > >X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] > > > >X-SMTP-REASON: PASSED > > > >X-SMTP-ID: 1182455563.14011407 > > > >X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) > > > >FILETIME=[BC4965C0:01C7B43D] > > > > > > > >A New Internet-Draft is available from the on-line Internet-Drafts > > > >directories. > > > > > > > > > > > > Title : Pre-Congestion Notification Architecture > > > > Author(s) : P. Eardley, et al. > > > > Filename : draft-eardley-pcn-architecture-00.txt > > > > Pages : 27 > > > > Date : 2007-6-21 > > > > > > > > The purpose of this document is to describe a general > > architecture > > > > for flow admission and termination based on aggregated (pre-) > > > > congestion information in order to protect the quality of > service > > of > > > > established inelastic flows within a single DiffServ domain. > > > > > > > > > > > >A URL for this Internet-Draft is: > > > > > > >http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t > > xt > > > > > > > >To remove yourself from the I-D Announcement list, send a message > to > > > >i-d-announce-request@ietf.org with the word unsubscribe in the body > > of > > > >the message. > > > >You can also visit > > https://www1.ietf.org/mailman/listinfo/I-D-announce > > > >to change your subscription settings. > > > > > > > >Internet-Drafts are also available by anonymous FTP. Login with the > > > >username "anonymous" and a password of your e-mail address. After > > > >logging in, type "cd internet-drafts" and then > > > >"get draft-eardley-pcn-architecture-00.txt". > > > > > > > >A list of Internet-Drafts directories can be found in > > > >http://www.ietf.org/shadow.html > > > >or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > > > > > > >Internet-Drafts can also be obtained by e-mail. > > > > > > > >Send a message to: > > > > mailserv@ietf.org. > > > >In the body type: > > > > "FILE > > /internet-drafts/draft-eardley-pcn-architecture-00.txt". > > > > > > > >NOTE: The mail server at ietf.org can return the document in > > > > MIME-encoded form by using the "mpack" utility. To use > this > > > > feature, insert the command "ENCODING mime" before the > > "FILE" > > > > command. To decode the response(s), you will need > "munpack" > > or > > > > a MIME-compliant mail reader. Different MIME-compliant > mail > > > readers > > > > exhibit different behavior, especially when dealing with > > > > "multipart" MIME messages (i.e. documents which have been > > split > > > > up into multiple messages), so check your local > > documentation on > > > > how to manipulate these messages. > > > > > > > >Below is the data which will enable a MIME compliant mail reader > > > >implementation to automatically retrieve the ASCII version of the > > > >Internet-Draft. > > > > > > > >Content-Type: text/plain > > > >Content-ID: <2007-6-21120238.I-D@ietf.org> > > > > > > > >ENCODING mime > > > >FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt > > > > > > > > > > > > > > 00.txt> > > > >_______________________________________________ > > > >I-D-Announce mailing list > > > >I-D-Announce@ietf.org > > > >https://www1.ietf.org/mailman/listinfo/i-d-announce > > > > > > > > > > > > > > > _______________________________________________ > > > PCN mailing list > > > PCN@ietf.org > > > https://www1.ietf.org/mailman/listinfo/pcn > > > > > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 13 05:02:23 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9H2d-0007kn-Eh; Fri, 13 Jul 2007 05:02:23 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I9H2c-0007kV-Ht for pcn-confirm+ok@megatron.ietf.org; Fri, 13 Jul 2007 05:02:22 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9H2c-0007kI-6M for pcn@ietf.org; Fri, 13 Jul 2007 05:02:22 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I9H2U-0002Ff-C9 for pcn@ietf.org; Fri, 13 Jul 2007 05:02:22 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 79EC08027; Fri, 13 Jul 2007 11:01:39 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id CE32E8179; Fri, 13 Jul 2007 11:01:37 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 0D14F8029; Fri, 13 Jul 2007 11:01:37 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6D91ak01870; Fri, 13 Jul 2007 11:01:37 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 76B676F58E; Fri, 13 Jul 2007 10:55:57 +0200 (CEST) Message-ID: <46973EA3.2080503@informatik.uni-wuerzburg.de> Date: Fri, 13 Jul 2007 10:58:11 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: "Geib, Ruediger" Subject: Re: FW: [PCN] Probing in the presence of hash-based load balancing References: <6439282641581441A36F7F6F83ED2ED201DB9967@S4DE8PSAAFQ.mitte.t-com.de> In-Reply-To: <6439282641581441A36F7F6F83ED2ED201DB9967@S4DE8PSAAFQ.mitte.t-com.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: d16ce744298aacf98517bc7c108bd198 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, I think designing a probing mechanism in such a way that it copes with ECMP is not too hard when we do that from scratch, but once we have defined just some mechanism which is not capable to do that, it will be very hard to extend it for that purpose. I don't think we want two different probing mechanisms, one which is ECMP-capable and another one with is not. Therefore, I would prefer to keep this goal in mind from the beginning of the design process. Regards, Michael Geib, Ruediger wrote: > Hi, > > some comments in line, marked [Rudi]. > > >> First, we shouldn't set harder requirements for probing than in the >> case where there is no probing. >> Ie our assumption to date has been that probing is needed when there's >> not enough recent traffic between the specific PCN-ingress-node & >> PCN-egress-node (that the new flow would flow between), in order that >> we can make an accurate measurement-based admission decision. Note >> this is traffic between the ingress & egress - it isn't "on the >> specific ECMP path that the new flow would flow along". >> > > [Joe]My assumption is that probing is needed under the following > conditions: > a)when there is no traffic between ingress-egress nodes for that > aggregate, > b)when there may be ECMP or other methods that may provide multiple > paths between ingress-egress nodes, > c)if there is a need to verify that real-time media packets once > admitted can infect reach the egress node. > > [Rudi] Probing is only required if any border node of a PCN domain > provides pre-congestion feedback. If that's the case, a) is required. > b) assumes ECMP "aware" probing. Phil mentioned ingress-egress above. > So Phil's thinking about some basic functionality while Joe's having > a more advanced solution in mind (which is desireable, but harder > to realise). > c) to me is not an aim, it is more something we can do it we > realise a) and b). > > >> Some options: >> - we could say the adm decision is made on basis of measured traffic >> between the specific PCN-ingress-node & PCN-egress-node >> - we could say the adm decision is made on basis of measured traffic >> along the specific ECMP path >> - we could leave this question open for the operator to decide (the >> first is a MUST, the second is a MAY?) >> > > [Joe]I think we better say that adm decision is made on basis of a > specific path. > > [Rudi]We can standardise an overly conservative solution if we agree > on MUST for the first. It is up to a provider to improve the > efficency of his operations and to ensure proper functionality of > PCN. The standard must insist on proper functionality and should > provide tools to improve efficiency. Looking at it from that angle, > Phil's suggestion on MUST for the first and MAY for the second is > allright. > > >> Lastly, re your point 4 below. This is a good question. I believe the >> answer isn't the same for all vendors. >> One specific question [slightly off topic of your email, as related to >> ecmp rather than probing specifically]: are the DS field & ECN field >> considered by the ecmp hash algos? If yes, that could mean that a pkt >> would travel a different ecmp path after it gets PCN-marked compared to >> if it stays unmarked; I'm not sure if this has any nasty implications >> for us, but we ought to think about it? >> > > [Joe]ECMP hash algorithms may use some or all of, source/destination IP > address, source/destination port numbers, protocol ID and DSCP field. > ECN field should not be used in hash algorithms. > > Michael Menth wrote on 10 July 2007 07:36 > >> 2) PCN-based AC is a border-to-border solution. Therefore, PCN-related >> signaling packets should not leave the network although equipped with >> "wrong" source and destination addresses. Is that true? If not, why >> not? >> > > [Joe]True. I believe that egress node would need to block from > forwarding to next node probe packets in a border-to-border scenario. > > [Rudi] Agree to Joe and Michael. > > >> 3) A standardized mechanism is required to encode probe packets that >> PCN egress routers can recognize and intercept them, and to signal >> appropriate feedback to the corresponding AC entities. >> > > [Joe]This is highly desirable. We need to define a probing method that > works with ECMP and egress router can easily detect probe packets. > > [Rudi] Yes, that's desireable. > > >> 4) I don't know the exact header fields used for the hash-based load >> balancing. These fields should be the same for normal data packets and >> probe packets to make sure that they all take the same path. Which >> fields are typically used for that purpose? Those that are typically >> not used might be changed to indicate that PCN packets are used for >> probing. >> > > [Joe] I believe ECN field in IP header could be used to signal to egress > router that this packet needs further inspection. Upon further > inspection the egress router determines that it is a probe packet. > > [Rudi] By that you define a "selective RAO", meaning that egress nodes > must interpret some IP header "codepoint" as RAO. The cool part of your > idea is that only some routers interpret this "codepoint" as RAO, not > all. Security demands to limit this option to a single domain of trust. > So an egress node must act differently on a packet received with that > codepoint, depending on the interface, where it is received (from > within PCN domain or from a PCN external interface). > I like the idea. If more people provide support, we may contact > the WG chairs to see how our chances are to get that standardised > within IETF. I'm not sure, whether this is "just a PCN decision". > Working on this proposal should however not delay work on the easier > to realise "ingress-egress" probing functionality. > > Regards, > > Ruediger > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 13 05:28:26 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9HRq-0003f0-Hk; Fri, 13 Jul 2007 05:28:26 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I9HRp-0003em-TS for pcn-confirm+ok@megatron.ietf.org; Fri, 13 Jul 2007 05:28:25 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9HRp-0003ee-HQ for pcn@ietf.org; Fri, 13 Jul 2007 05:28:25 -0400 Received: from szxga04-in.huawei.com ([61.144.161.7]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1I9HRn-0002qC-Cg for pcn@ietf.org; Fri, 13 Jul 2007 05:28:25 -0400 Received: from huawei.com (szxga04-in [172.24.2.12]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JL400C8Y29KU0@szxga04-in.huawei.com> for pcn@ietf.org; Fri, 13 Jul 2007 17:27:21 +0800 (CST) Received: from huawei.com ([172.24.1.24]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JL400IZO29IDL@szxga04-in.huawei.com> for pcn@ietf.org; Fri, 13 Jul 2007 17:27:20 +0800 (CST) Received: from z24109a ([10.70.76.134]) by szxml04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JL400L4B29HFE@szxml04-in.huawei.com> for pcn@ietf.org; Fri, 13 Jul 2007 17:27:18 +0800 (CST) Date: Fri, 13 Jul 2007 17:27:17 +0800 From: Tina TSOU Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt To: philip.eardley@bt.com, pcn@ietf.org Message-id: <00a001c7c530$018b0aa0$864c460a@china.huawei.com> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 Content-type: text/plain; format=flowed; charset=iso-8859-1; reply-type=response Content-transfer-encoding: 7BIT X-Priority: 3 X-MSMail-priority: Normal References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC30B@E03MVZ1-UKDY.domain1.systemhost.net> <004e01c7c529$5eae4a00$864c460a@china.huawei.com> X-Spam-Score: 0.0 (/) X-Scan-Signature: 9aa22b77adc37e7d33e29644e4dc0b33 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Sorry, forgot to delete "policy and". They should be display as below. > The decision is made at a centralised node, which requires that > the PCN-egress-node signals to the centralised node about "the > required measurements of PCN-traffic" (and that the centralised > node learns about application layer requirements), and > that the centralised node signals to the PCN-ingress-node about > the decision about admission control and relative QoS policies. It would > be possible for > the centralised node to be one of the PCN-boundary-nodes, when > clearly the signalling would sometimes be replaced by a message > internal to the node. B. R. Tina ----- Original Message ----- From: "Tina TSOU" To: ; Sent: Friday, July 13, 2007 4:39 PM Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > Hi Phil, > Thanks:) > > Wrt to section 5.4, I suggest as below. > /*delete "policy and"*/ > /*add "and relative QoS policies"*/ > The decision is made at a centralised node, which requires that > the PCN-egress-node signals to the centralised node about "the > required measurements of PCN-traffic" (and that the centralised > node learns about policy and application layer requirements), and > that the centralised node signals to the PCN-ingress-node about > the decision about admission control and relative QoS policies. It would > be possible for > the centralised node to be one of the PCN-boundary-nodes, when > clearly the signalling would sometimes be replaced by a message > internal to the node. > > B. R. > Tina > > ----- Original Message ----- > From: > To: ; > Sent: Thursday, July 12, 2007 7:45 PM > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > Tina > > Thanks > > Your changes in S1 & S2 seem good to me. > > You made a comment in S5.4, but didn't suggest a text change. I think > your comment doesn't need any change to S4 (ie it's already covered > either in S5.4 [option of centralised node making decision] or earlier > [ingress node doing policing]. is that ok? > > Thanks > Phil/ > >> -----Original Message----- >> From: Tina TSOU [mailto:tena@huawei.com] >> Sent: 11 July 2007 04:56 >> To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R >> Subject: Re: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt >> >> Hi Phil, >> I made some proposed specific changes with revised mark together with >> comments in the attachment. >> Hope it helps:) >> >> B. R. >> Tina >> >> ----- Original Message ----- >> From: >> To: ; >> Sent: Monday, July 09, 2007 8:16 PM >> Subject: RE: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt >> >> >> Tina >> Thanks >> I'm not sure I completely understand your comments, sorry. >> >> Is the problem that at the moment the draft only describes the Pull >> model and not the Push model? Which lines of text need changing? >> (somewhere in Section 5.4 or section 7 or somewhere else?) >> >> Thanks! >> phil >> >> > -----Original Message----- >> > From: Tina TSOU [mailto:tena@huawei.com] >> > Sent: 02 July 2007 04:38 >> > To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R >> > Subject: Re: [PCN] Fwd: I-D >> ACTION:draft-eardley-pcn-architecture-00.txt >> > >> > Hi all, >> > One of the scenarios I am suggesting is below. >> > >> > Even in Pull mode, application layer QoS request (via RSVP) should > be >> also >> > sent from ingress to the centralized node, in centralized node the >> policy >> > is >> > generated, then the decision is made, and then delivers to the > Ingress >> to >> > enforce. I was not saying that the policy is directly generated in > the >> > Ingress. Even the rather that Push mode should be also taken into >> account. >> > >> > I.e. we define the centralized node locates in the transport control >> > layer; >> > the Ingress and Egress locate in transport layer. For the >> implementation >> > of >> > physical entities, they are service policy server and PCN-enabled >> router >> > respectively. >> > >> > The centralized node is policy decision node, it should be based on >> (1) >> > Egress measurement result (2) operator's policies (could be > configured >> in >> > the centralized node) (3) QoS request coming from the application >> layer >> > (PUSH or PULL mode), to make the decision, and decide which flows >> should >> > be >> > admitted or reject, which flows should be stopped temperately or >> > downgraded, >> > which flows should be done policing. The generated policy should be >> sent >> > to >> > ingress for enforcement. >> > >> > Ingress is the policy enforcement point, it based on the policy >> delivered >> > by >> > the centralized node, (1) it allows flow pass or filter flow, (2) > for >> the >> > flows allowed to pass, it makes policing and coloring based on the >> policy. >> > >> > Referrence: >> > QoS "Push" Model: model where the centralised node "pushes" traffic >> > policies >> > to the transport functions to enforce its policy decisions. >> > NOTE: In this model, the CPE does not itself support native >> application >> > independent QoS procedures. >> > QoS "Pull" Model: model where, upon request from the transport >> processing >> > functions, the centralised node provides traffic policies to the >> transport >> > processing functions. The request from the transport processing >> functions >> > may itself, for example, be triggered by path-coupled requests > coming >> from >> > user equipment and/or transport network elements. >> > >> > >> > B. R. >> > Tina >> > >> > ----- Original Message ----- >> > From: >> > To: >> > Sent: Thursday, June 28, 2007 11:59 PM >> > Subject: RE: [PCN] Fwd: I-D >> ACTION:draft-eardley-pcn-architecture-00.txt >> > >> > >> > Hi all, >> > >> > Just a reminder that all comments on this draft would be great. It >> aims >> > to describe the PCN architecture, in light of the PCN WG's Charter & >> its >> > Milestone of an Info doc on 'Flow Admission and Termination >> Architecture >> > within a Diffserv Domain' (due Nov 07). >> > >> > S1 Introduction. >> > This is quite short. If desired, it could be boosted with a general >> > explanation of where PCN fits into the picture of QoS and how it's >> > evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) >> > >> > S2 Terminology >> > In the "Editor's note" are 3 alternative terms that some of the >> authors >> > preferred. >> > >> > S3 Assumptions and constraints on scope >> > These are the 4 things mentioned in the Charter, plus some > explanation >> > of them. Are they clear? Also we mention some of the ways that a >> future >> > revised Charter might look at overcoming some of the >> > constraints/assumptions; is this sub-section at the right depth? >> > >> > S4 High-level functional architecture >> > We have tried to write this section (and the following ones) so that >> it >> > fits all the various proposals there've been for PCN mechanisms. > Does >> > this make the section too wishy-washy or too hard to understand? >> Should >> > it include some comparison of the different mechanisms proposed >> > (PCN-interior-node marking algorithms & PCN-boundary-node > reactions)? >> > >> > S5 Detailed Functional architecture >> > Is this a reasonable description of the extra functionality that PCN >> > requires on various nodes in the PCN-domain? Is it the right way to >> > split up the description? For clarity / help reader's understanding, >> > should there be some specific examples of how functionality might be >> > distributed (eg "if you followed the deployment model in >> > draft-briscoe-tsvwg-cl-architecture-04, then this measurement is > made >> at >> > the PCN-egress-node, communicated to the PCN-ingress-nodes which > makes >> > the admission decision; etc.") >> > >> > S6 Design goals and challenges >> > This briefly describes some open issues, taken from >> > briscoe-tsvwg-cl-architecture. Are there other ones that should be >> > mentioned? Is the problem description at the right level of depth? >> > Should we discuss various possible solutions to these problems? >> > >> > S7 Deployment scenarios >> > Briefly describes some deployment scenarios for pcn? is this at the >> > right level of depth? >> > >> > S8 Operations and Management >> > This section was written in response to the Charter saying that the >> > architecture document should include security, manageability and >> > operational considerations. The draft addresses this by providing > some >> > thoughts under the FCAPS headings: OAM of Faults, Configuration, >> > Accounting, Performance and Security? Is this the right way of >> > structuring it - does it cover the right set of topics? Is the text > at >> > the right level? - eg should it also have a detailed set of > parameters >> > that would be available for configuration? >> > >> > An overall question is whether the draft should have more comparison >> of >> > the options (pros/cons) for various aspects. >> > >> > I aim to edit another version of the draft before the ietf (but > maybe >> > not before the deadline as I'm on hols next week). >> > >> > Thanks! >> > Phil/ >> > >> > >> > > -----Original Message----- >> > > From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> > > Sent: 22 June 2007 04:38 >> > > To: pcn@ietf.org >> > > Subject: [PCN] Fwd: I-D > ACTION:draft-eardley-pcn-architecture-00.txt >> > > >> > > Hi all: >> > > Please see the attached E-Mail on the posting of the PCN >> Architecture >> > > draft. >> > > On behave of the editor of this draft: Phil, and the co-authors of >> > this >> > > draft, >> > > we would like to request for reviews and comments of this draft > and >> > > welcome >> > > any comments for improvements. >> > > >> > > Please send your comments/discussions of this draft on the PCN > list. >> > > >> > > Thank you for your interest and review of this draft! >> > > -- Kwok on behave of the co-authors of this draft -- >> > > >> > > >> > > >To: i-d-announce@ietf.org >> > > >Cc: >> > > >From: Internet-Drafts@ietf.org >> > > >Date: Thu, 21 Jun 2007 15:50:02 -0400 >> > > >X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 >> > > >Subject: I-D ACTION:draft-eardley-pcn-architecture-00.txt >> > > >X-BeenThere: i-d-announce@ietf.org >> > > >X-Mailman-Version: 2.1.5 >> > > >Reply-To: internet-drafts@ietf.org >> > > >List-Id: i-d-announce.ietf.org >> > > >List-Unsubscribe: >> > , >> > > > >> > > >List-Archive: >> > > >List-Post: >> > > >List-Help: >> > > >List-Subscribe: >> > , >> > > > >> > > >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, >> > > > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=4 >> > > >X-Spam-Score: 5.3 >> > > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >> > > ecarhea1.nortel.com >> > > >X-DNSBL-Score: -50 >> > > >X-DNSBL-Servers: bl.nortel.com >> > > >X-SMTP-HELO: megatron.ietf.org >> > > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >> > > >X-SMTP-RCPT-TO: >> > > >> > >> >>kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel >> > .c >> > > >> > >> > om,babiarz@nortel.com,audet@nortel.com,aceler@nortel.com,simmonds@nortel >> > .c >> > > >> > >> > om,huiwc@nortel.com,amuhanna@nortel.com,mchen@nortel.com,khchan@nortel.c >> > om >> > > >X-SMTP-PEER-INFO: odin.ietf.ORG [156.154.16.145] >> > > >X-SMTP-REASON: PASSED >> > > >X-SMTP-ID: 1182455563.14011407 >> > > >X-OriginalArrivalTime: 21 Jun 2007 19:52:44.0828 (UTC) >> > > >FILETIME=[BC4965C0:01C7B43D] >> > > > >> > > >A New Internet-Draft is available from the on-line > Internet-Drafts >> > > >directories. >> > > > >> > > > >> > > > Title : Pre-Congestion Notification > Architecture >> > > > Author(s) : P. Eardley, et al. >> > > > Filename : draft-eardley-pcn-architecture-00.txt >> > > > Pages : 27 >> > > > Date : 2007-6-21 >> > > > >> > > > The purpose of this document is to describe a general >> > architecture >> > > > for flow admission and termination based on aggregated (pre-) >> > > > congestion information in order to protect the quality of >> service >> > of >> > > > established inelastic flows within a single DiffServ domain. >> > > > >> > > > >> > > >A URL for this Internet-Draft is: >> > > >> > >> >>http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.t >> > xt >> > > > >> > > >To remove yourself from the I-D Announcement list, send a message >> to >> > > >i-d-announce-request@ietf.org with the word unsubscribe in the > body >> > of >> > > >the message. >> > > >You can also visit >> > https://www1.ietf.org/mailman/listinfo/I-D-announce >> > > >to change your subscription settings. >> > > > >> > > >Internet-Drafts are also available by anonymous FTP. Login with > the >> > > >username "anonymous" and a password of your e-mail address. After >> > > >logging in, type "cd internet-drafts" and then >> > > >"get draft-eardley-pcn-architecture-00.txt". >> > > > >> > > >A list of Internet-Drafts directories can be found in >> > > >http://www.ietf.org/shadow.html >> > > >or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> > > > >> > > >Internet-Drafts can also be obtained by e-mail. >> > > > >> > > >Send a message to: >> > > > mailserv@ietf.org. >> > > >In the body type: >> > > > "FILE >> > /internet-drafts/draft-eardley-pcn-architecture-00.txt". >> > > > >> > > >NOTE: The mail server at ietf.org can return the document in >> > > > MIME-encoded form by using the "mpack" utility. To use >> this >> > > > feature, insert the command "ENCODING mime" before the >> > "FILE" >> > > > command. To decode the response(s), you will need >> "munpack" >> > or >> > > > a MIME-compliant mail reader. Different MIME-compliant >> mail >> > > readers >> > > > exhibit different behavior, especially when dealing with >> > > > "multipart" MIME messages (i.e. documents which have > been >> > split >> > > > up into multiple messages), so check your local >> > documentation on >> > > > how to manipulate these messages. >> > > > >> > > >Below is the data which will enable a MIME compliant mail reader >> > > >implementation to automatically retrieve the ASCII version of the >> > > >Internet-Draft. >> > > > >> > > >Content-Type: text/plain >> > > >Content-ID: <2007-6-21120238.I-D@ietf.org> >> > > > >> > > >ENCODING mime >> > > >FILE /internet-drafts/draft-eardley-pcn-architecture-00.txt >> > > > >> > > > >> > > >>> > > 00.txt> >> > > >_______________________________________________ >> > > >I-D-Announce mailing list >> > > >I-D-Announce@ietf.org >> > > >https://www1.ietf.org/mailman/listinfo/i-d-announce >> > > >> > > >> > > >> > > >> > > _______________________________________________ >> > > PCN mailing list >> > > PCN@ietf.org >> > > https://www1.ietf.org/mailman/listinfo/pcn >> > >> > >> > _______________________________________________ >> > PCN mailing list >> > PCN@ietf.org >> > https://www1.ietf.org/mailman/listinfo/pcn > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 13 05:40:56 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9Hdw-0007fQ-KI; Fri, 13 Jul 2007 05:40:56 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1I9Hdt-0007fA-NE for pcn-confirm+ok@megatron.ietf.org; Fri, 13 Jul 2007 05:40:55 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1I9Hdt-0007f2-DV for pcn@ietf.org; Fri, 13 Jul 2007 05:40:53 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1I9Hdo-0000IB-Ld for pcn@ietf.org; Fri, 13 Jul 2007 05:40:53 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 116687FF6; Fri, 13 Jul 2007 11:40:46 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 04104803C; Fri, 13 Jul 2007 11:40:46 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id C6C377FF6; Fri, 13 Jul 2007 11:40:45 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6D9ejk02389; Fri, 13 Jul 2007 11:40:45 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id A2FBF6F58E; Fri, 13 Jul 2007 11:35:06 +0200 (CEST) Message-ID: <469747D0.3020905@informatik.uni-wuerzburg.de> Date: Fri, 13 Jul 2007 11:37:20 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: philip.eardley@bt.com Subject: Re: [PCN] Terminology References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC309@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC309@E03MVZ1-UKDY.domain1.systemhost.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.5 (/) X-Scan-Signature: 2a76bcd37b1c8a21336eb0a1ea6bbf48 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil and others, I have the feeling that everybody can live with the term "admissible rate". Regarding the terms "sustainable or supportable rate" I suspect that some people are not happy about them because they implicate some "right" to always use that bandwidth although this should rather be an exception. I can understand that. The term "configured-termination-rate" anticipates the action how the traffic rate is reduced when the respective rate is exceeded although options exist, therefore, this expression isn't good either. A neutral solution to that problem is "tolerable rate" which avoids all the mentioned misleading connotations. Any objections? Regards, Michael philip.eardley@bt.com wrote: > Hi > > It seems more intuitive to me that the terminology should come as "sets" > of very similar terms that relate to the same mechanism. IE related > terms should obviously be related without having to think about it:- > > admission control | configured-admissible-rate | admission-marking (& > admission-marked-rate) > > termination control | configured-termination-rate | termination-marking > > I find it not instantly obvious that your suggested terms are related: > {termination control | excess-traffic marking | supportable-rate} > > > A few more comments in-line > > Thanks > phil > > > >> -----Original Message----- >> From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] >> Sent: 10 July 2007 07:44 >> To: pcn@ietf.org >> Subject: [PCN] Terminology >> >> Hi, >> >> I would like to discuss (again) some terminology for PCN. To get >> > things > >> done quickly, we stuck in the architecture draft to the working >> nomenclature from the CL draft and left the exact names for further >> discussion. See Section 2 of >> >> > http://www.ietf.org/internet-drafts/draft-eardley-pcn-architecture-00.tx > t > >> We proposed an alternative nomenclature in Section 1.3 of >> http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt >> >> The main differences are the following four names, all other terms are >> fine: >> >> "admissible rate" instead of "configured-admission-rate": >> > > [phil] the draft actually uses configured-admissible-rate. Dropping > 'configured' would be ok with me. > > >> It's the rate that CAN be admitted. Then it is self-understood that >> > the > >> rate is not measured but configured. >> >> "supportable rate" instead of "configured-termination-rate": >> It's the rate that CAN be supported. Then it is self-understood that >> > the > >> rate is not measured but configured. Furthermore, an alternative >> > action > >> for flow termination is rate reduction for which the name >> > "termination" > >> is not appropriate. >> > > [phil] strictly it isn't the rate that can be supported; traffic can be > supported up to the rate configured for the DS class used by the PCN > traffic. It's the rate above which you start termination-marking pkts. > > Perhaps we need something like terminatable-rate or > terminatable-marking?! (I will be back) > > Yes, the charter says that after re-chartering the WG "may also consider > to investigate additional response mechanisms that act on > (pre-)congestion information". So your same point could be made that > admission-marking is an inaccurate term, because in the future the WG > might consider an action other than admission control. However, > personally I don't think potential future charter should influence > terminology. > > >> "admission-stop marking" instead of "admission-marking": >> > > [phil] I don't object too much to admission-stop-marking (or > admission-control-marking) instead of admission-marking. Personally I > find the latter a bit simpler. > > >> The meaning of the marking is that admission should be stopped. The >> > name > >> "admission-marking" rather suggests the opposite. >> > > [phil] isn't it self-understood that pkts are marked at higher traffic > rates and not marked at low traffic rates? > > >> This is also in line >> with the single-marking approach. >> >> "excess-traffic marking" instead of "termination-marking": >> The name "termination-marking" is fine as long as flow termination is >> the only option to reduce the rate of ingress-egress-aggregates when >> > the > >> supportable rate of a link is exceeded. However, an alternative >> > reaction > >> to this marking is flow rate reduction (although not in this charter). >> Therefore, the name of that marking should be neutral with >> regard to the action. >> >> Regards, >> >> Michael >> >> -- >> Dr. Michael Menth, Assistant Professor >> University of Wuerzburg, Institute of Computer Science >> Am Hubland, D-97074 Wuerzburg, Germany, room B206 >> phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 >> mailto:menth@informatik.uni-wuerzburg.de >> http://www3.informatik.uni-wuerzburg.de/research/ngn >> >> >> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 16 14:52:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IAVg5-0000Zf-HO; Mon, 16 Jul 2007 14:52:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IAVg4-0000Za-Cz for pcn-confirm+ok@megatron.ietf.org; Mon, 16 Jul 2007 14:52:12 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IAVg4-0000ZS-3O for pcn@ietf.org; Mon, 16 Jul 2007 14:52:12 -0400 Received: from imr2.ericy.com ([198.24.6.3]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IAVg0-0007HN-Jd for pcn@ietf.org; Mon, 16 Jul 2007 14:52:12 -0400 Received: from eusrcmw750.eamcs.ericsson.se (eusrcmw750.exu.ericsson.se [138.85.77.50]) by imr2.ericy.com (8.13.1/8.13.1) with ESMTP id l6GIss4p020842 for ; Mon, 16 Jul 2007 13:54:54 -0500 Received: from eusrcmw751.eamcs.ericsson.se ([138.85.77.51]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Mon, 16 Jul 2007 13:52:07 -0500 Received: from [147.117.169.165] ([147.117.169.165]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Mon, 16 Jul 2007 13:52:06 -0500 From: Steven Blake To: pcn Content-Type: multipart/mixed; boundary="=-wLl4B9SXpVDz4AOFRu1E" Organization: Ericsson IP Infrastructure Date: Mon, 16 Jul 2007 14:52:04 -0400 Message-Id: <1184611924.12756.1.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) X-OriginalArrivalTime: 16 Jul 2007 18:52:07.0164 (UTC) FILETIME=[6865ABC0:01C7C7DA] X-Spam-Score: 0.1 (/) X-Scan-Signature: 244a2fd369eaf00ce6820a760a3de2e8 Subject: [PCN] IETF 69 FINAL PCN agenda X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org --=-wLl4B9SXpVDz4AOFRu1E Content-Type: text/plain Content-Transfer-Encoding: 7bit See attached; also at http://www3.ietf.org/proceedings/07jul/agenda/pcn.txt =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 --=-wLl4B9SXpVDz4AOFRu1E Content-Disposition: attachment; filename=pcn-ietf69-agenda.txt Content-Type: text/plain; name=pcn-ietf69-agenda.txt; charset=UTF-8 Content-Transfer-Encoding: 7bit Congestion and Pre-Congestion Notification WG (pcn) Wednesday, July 25, 2007 0900-1130 Morning Session I Adams ==================================== CHAIRs: Scott Bradner Steven Blake AGENDA: o Administrivia chairs 10 min - Blue sheets - Scribe - Agenda bash - Milestones status o Pre-Congestion Notification Architecture Philip Eardley 30 min draft-eardley-pcn-architecture-00 o LC-PCN - The Load Control PCN Solution G. Karagiannis 15 min draft-westberg-pcn-load-control-00 o Pre-Congestion Notification Encoding Comparison Kwok-Ho Chan 30 min draft-chan-pcn-encoding-comparison-00 o Pre-Congestion Notification Using Single Marking Anna Charny 10 min for Admission and Termination draft-charny-pcn-single-marking-02 o Performance Evaluation fo CL-PHB Admission and Anna Charny 10 min Termination Algorithms draft-zhang-pcn-performance-evaluation-02 o Three State PCN Marking Kwok-Ho Chan 10 min draft-babiarz-pcn-3sm-00 o Simulations Results for 3sM Jozef Babiarz 10 min draft-babiarz-pcn-explicit-marking-01 --=-wLl4B9SXpVDz4AOFRu1E Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --=-wLl4B9SXpVDz4AOFRu1E-- From pcn-bounces@ietf.org Thu Jul 19 06:12:30 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBSzm-0000DL-4z; Thu, 19 Jul 2007 06:12:30 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBSzk-0000DG-W5 for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 06:12:28 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBSzk-0000D8-JM for pcn@ietf.org; Thu, 19 Jul 2007 06:12:28 -0400 Received: from smtp2.smtp.bt.com ([217.32.164.150]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBSzi-0000mh-Vy for pcn@ietf.org; Thu, 19 Jul 2007 06:12:28 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 19 Jul 2007 11:12:26 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt Date: Thu, 19 Jul 2007 11:12:25 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC33F@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt Thread-Index: Ace/QRH97pFgL1VcT7ykybe9X25oCQKmI1Sg From: To: , X-OriginalArrivalTime: 19 Jul 2007 10:12:26.0339 (UTC) FILETIME=[4E6A9B30:01C7C9ED] X-Spam-Score: 0.0 (/) X-Scan-Signature: fb93e867a11a29ac1dc5018706b412ac Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Kwok, Georgios I read your draft. I have quite a lot of comments, but the basic msg is that i think it's a suitable starting point for a WG draft (towards the Charter milestone on this subject) - thanks. 1. motivation & goals this seems quite long for this draft, maybe the material is more suitable elsewhere eg architecture draft? 2. PCN encoding .. in current PCN .. mechanisms & Appendix I didn't find it useful to present the various proposed mechanisms. The dependence between encoding & mechanism (marking algo & PCN-boundary-node reaction) seem pretty weak to me. In fact I think there's almost none, except in terms of the number of codepoints that a proposed mechanism uses. (Even this is not clear-cut; for example 'Affected marking' could, I think, be easily added to those proposals that don't mention it, or indeed removed from those proposals that do.) So can this section simply say that different proposals require different numbers of encoding codepoints, and explain this in a paragraph? Incidentally, I found it a bit confusing to describe "not congested" as a feature - at least, it doesn't seem a feature in the way that adm ctrl & flow termination are features. In fact, I found the discussion of 'features' in S3 & 4 a bit misleading (stick with codepoints). I think phrases like "requirement for xx marking" could be better expressed (are they reqts? It's a choice about how many codepoints we have) 3. survey of encoding the table is very useful.=20 Would it be better grouping the options in terms of the number of codepoints required? Ie if the mechanism needs 3 codepoints here are your options; if it needs 4 here they are etc. Should there be an option similar to option 9, but with PCN dscp? Should there be an option similar to option 10/11, but with 2 DSCPs? (that single marking mechanism could use) Don't understand NDS-CE There are many typos where 'none' should be 'non' (non PCN capable transport) In option 2 (& 6, 7) what does ECT(A) & ECT(T) mean? (I remember back in Briscoe-cl-phb we looked at an option where PCN marking was signalled by a *change* of codepoint, maybe it's referring to this idea? ie Adm marking is 01 -> 00 & Termination marking is 10 -> 11.) S3.4 use of IPFIX. I know you included this section because the charter seems to suggest it - but I must admit to finding it out of place in this doc. 4. comparison I wonder if it's worth starting this section with all the points that relate to how many codepoints there should be, and later handle the more detailed aspects. Aspects of the first part: - will there be non-PCN traffic in the DS network? (surely a clear yes, ie we need a separate PCN DSCP(s)) - MPLS (which has limited codepoint space) [discussed in earlier Briscoe-cl-architecture drafts - could adapt text from there] - whether 'affected marking' is needed /useful [no consensus at present - based on your text in S2] - whether adm ctrl & termination ctrl can be driven by the same encoding - perhaps that adm ctrl & flow termination mechanisms are not required to both be deployed (just one could be) - etc this would actually shorten some of the draft, eg S4.2.3 could basically disappear.=20 some of the ECN nonce discussion I found hard to follow 4.1.5. explain what 'alternate ECN semantics' means S4.2.5 I didn't follow what cases you were distinguishing. there are a couple of issues at the high level: whether ECN nonce is useful with PCN; backwards compatibility of PCN with ECN nonce, eg in an 'unusual situation' such as the PCN pkt encounters an 'old' (ECN) router. could mention the discussion we had about the charter assuming a single domain, but we're going to keep strongly in mind that want it to work multi-domain in future. This seems esp important when it comes to encoding - after all, if it's just your domain you can do what you like. The multi-domain consideration has several impacts I think:=20 * makes standardising encoding important * need to consider rfc4774 [because the issues it raises are probably more significant in the inter-domain case than in one domain under one operator's control] * need to consider limitations about encoding from draft-briscoe-re-pcn-border-cheat-00.txt [proposed mechanism for making PCN work inter-domain] best wishes - see you in Chicago! phil > -----Original Message----- > From: Kwok-Ho Chan [mailto:khchan@nortel.com] > Sent: 05 July 2007 21:13 > To: pcn@ietf.org > Subject: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt >=20 > PCN WG: > I would like to bring to your attention the availability of the > initial version of PCN Encoding Comparison draft. >=20 > Please review and comment. And discuss on the PCN list. >=20 > Thank you very much and looking forward to your comments. > -- Kwok and Georgios -- >=20 > >To: i-d-announce@ietf.org > >Cc: > >From: Internet-Drafts@ietf.org > >Date: Thu, 05 Jul 2007 13:15:02 -0400 > >X-Scan-Signature: 14582b0692e7f70ce7111d04db3781c8 > >Subject: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt > >X-BeenThere: i-d-announce@ietf.org > >X-Mailman-Version: 2.1.5 > >Reply-To: internet-drafts@ietf.org > >List-Id: i-d-announce.ietf.org > >List-Unsubscribe: , > > > >List-Archive: > >List-Post: > >List-Help: > >List-Subscribe: , > > > >X-Spam-Score: 2.3 > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > ecarhea1.nortel.com > >X-Spam-Tests: FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, > > NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D1 > >X-DNSBL-Score: -50 > >X-DNSBL-Servers: bl.nortel.com > >X-SMTP-HELO: megatron.ietf.org > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > >X-SMTP-RCPT-TO: > >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharrath@nortel .c > om,babiarz@nortel.com,aceler@nortel.com,simmonds@nortel.com,huiwc@nortel .c > om,amuhanna@nortel.com,gparsons@nortel.com,mchen@nortel.com,khchan@norte l. > com > >X-SMTP-PEER-INFO: megatron.ietf.ORG [156.154.16.145] > >X-SMTP-REASON: PASSED > >X-SMTP-ID: 1183656101.14019435 > >X-OriginalArrivalTime: 05 Jul 2007 17:21:42.0459 (UTC) > >FILETIME=3D[F47A20B0:01C7BF28] > > > >A New Internet-Draft is available from the on-line Internet-Drafts > >directories. > > > > > > Title : Pre-Congestion Notification Encoding > Comparison > > Author(s) : K. Chan, G. Karagiannis > > Filename : draft-chan-pcn-encoding-comparison-00.txt > > Pages : 36 > > Date : 2007-7-5 > > > > DiffServ mechanisms have been developed to support Quality of Service > > (QoS). However, the level of assurance that can be provided with > > DiffServ without substantial over-provisioning is limited. Pre- > > Congestion Notification (PCN) investigates the use of per-flow > > admission control to provide the required service guarantees for the > > admitted traffic. While admission control will protect the QoS under > > normal operating conditions, an additional flow termination > > mechanism is necessary in the times of heavy congestion (e.g. caused > by route > > changes due to link or node failure). > > > > Encoding and their transport are required to carry the congestion and > > pre-congestion information from the congestion and pre-congestion > > points to the decision points. This document provides a survey of > > several encoding methods, using comparisons amongst them as a way to > > explain their strengths and weaknesses. > > > > > > > >A URL for this Internet-Draft is: > >http://www.ietf.org/internet-drafts/draft-chan-pcn-encoding-comparison- > 00.txt > > > >To remove yourself from the I-D Announcement list, send a message to > >i-d-announce-request@ietf.org with the word unsubscribe in the body of > >the message. > >You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce > >to change your subscription settings. > > > >Internet-Drafts are also available by anonymous FTP. Login with the > >username "anonymous" and a password of your e-mail address. After > >logging in, type "cd internet-drafts" and then > >"get draft-chan-pcn-encoding-comparison-00.txt". > > > >A list of Internet-Drafts directories can be found in > >http://www.ietf.org/shadow.html > >or ftp://ftp.ietf.org/ietf/1shadow-sites.txt > > > >Internet-Drafts can also be obtained by e-mail. > > > >Send a message to: > > mailserv@ietf.org. > >In the body type: > > "FILE /internet-drafts/draft-chan-pcn-encoding-comparison- > 00.txt". > > > >NOTE: The mail server at ietf.org can return the document in > > MIME-encoded form by using the "mpack" utility. To use this > > feature, insert the command "ENCODING mime" before the "FILE" > > command. To decode the response(s), you will need "munpack" or > > a MIME-compliant mail reader. Different MIME-compliant mail > readers > > exhibit different behavior, especially when dealing with > > "multipart" MIME messages (i.e. documents which have been split > > up into multiple messages), so check your local documentation on > > how to manipulate these messages. > > > >Below is the data which will enable a MIME compliant mail reader > >implementation to automatically retrieve the ASCII version of the > >Internet-Draft. > > > >Content-Type: text/plain > >Content-ID: <2007-7-5125842.I-D@ietf.org> > > > >ENCODING mime > >FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt > > > > > > 00.txt> > >_______________________________________________ > >I-D-Announce mailing list > >I-D-Announce@ietf.org > >https://www1.ietf.org/mailman/listinfo/i-d-announce >=20 >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 19 10:22:58 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBWuA-0004pF-81; Thu, 19 Jul 2007 10:22:58 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBWu8-0004oE-4R for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 10:22:56 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBWu7-0004nq-Nn for pcn@ietf.org; Thu, 19 Jul 2007 10:22:55 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBWu5-00082n-Qe for pcn@ietf.org; Thu, 19 Jul 2007 10:22:55 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 19 Jul 2007 15:22:39 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Subject: RE: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Date: Thu, 19 Jul 2007 15:22:28 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC344@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <467FA562.2060603@ericsson.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Thread-Index: Ace3GxtZWDEHRn83T/m3IGeLNeDF2AS8YfSw From: To: , X-OriginalArrivalTime: 19 Jul 2007 14:22:39.0176 (UTC) FILETIME=[42C3BC80:01C7CA10] X-Spam-Score: 0.0 (/) X-Scan-Signature: 872695ea777a517bf5717e5acc69f8be Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0664784525==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============0664784525== Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7CA10.3C416E16" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7CA10.3C416E16 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Lars =20 I started reading your draft, but have a couple of clarification questions about what you're proposing. =20 As I understand it:- * there are two marking algorithms on the interior routers * Admission-marking: if the rate exceeds threshold-1, then all pkts are Adm marked * Termination-marking: if the rate exceeds threshold-2, the excess-traffic rate is measured and a fraction (1/N) of the excess rate is Termination marked. =20 The adm marking algo is a bit unclear to me, sometimes it's described as marking all pkts as soon as threshold-1 is exceeded - sometimes (eg S4.1.3) it seems that a fraction of the excess traffic is marked (same idea as above under " * Termination marked"). Which is correct? =20 I'm also not sure what "encoded DSCP" and "notified DSCP" mean. Do they correspond to Admission-marking and Termination-marking, or do they mean something else? =20 A point that doesn't just apply to this draft: http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-pkt-mark-00. txt which looks at "whether to allow for packet size when the network codes or when the transport decodes congestion notification." This draft argues that, when marking, the packet size should not be taken into account.=20 =20 Thanks phil =20 -----Original Message----- From: Lars Westberg [mailto:Lars.westberg@ericsson.com]=20 Sent: 25 June 2007 12:22 To: pcn@ietf.org Subject: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt =20 Dear all The "LC-PCN - The Load Control PCN solution" draft can be found via: http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-control-00.t xt Abstract There is an increased interest of simple and scalable resource provisioning solution for Diffserv network. The Load Control PCN (LC-PCN) addresses the following issues: 1. Admission control for real time data flows in stateless Diffserv Domains 2. Flow termination: Termination of flows in case of exceptional events, such as severe congestion after re-routing. Admission control in a Diffserv stateless domain is a combination of: 1. Probing, whereby a probe packet is sent along the forwarding path in a network to determine whether a flow can be admitted based upon the current congestion state of the network 2. Admission control based on data marking, whereby in congestion situations the data packets are marked to notify the egress node that a congestion occurred on a particular ingress to egress path. The scheme provides the capability of controlling the traffic load in the network without requiring signaling or any per-flow processing in the core routers. The complexity of Load Control is kept to a minimum to make implementation simple. Kind regards, Lars ------_=_NextPart_001_01C7CA10.3C416E16 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Lars

 

I started reading your draft, but = have a couple of clarification questions about what you’re = proposing.

 

As I understand = it:-

* there are two marking algorithms = on the interior routers

* Admission-marking: if the rate = exceeds threshold-1, then all pkts are Adm marked

* Termination-marking: if the rate = exceeds threshold-2, the excess-traffic rate is measured and a fraction (1/N) of = the excess rate is Termination marked.

 

The adm marking algo is a bit = unclear to me, sometimes it’s described as marking all pkts as soon as = threshold-1 is exceeded – sometimes (eg S4.1.3) it seems that a fraction of = the excess traffic is marked (same idea as above under “ * Termination = marked”). Which is correct?

 

I’m also not sure what = “encoded DSCP” and “notified DSCP” mean. Do they correspond to = Admission-marking and Termination-marking, or do they mean something = else?

 

A point that doesn’t just = apply to this draft:

http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-p=
kt-mark-00.txt which looks at “whether to allow =
for packet size when the network codes or when the transport decodes =
congestion notification.” This draft argues that, when marking, =
the packet size should not be taken into account. 
 
Thanks
phil

 

-----Origi= nal Message-----
From: Lars Westberg [mailto:Lars.westberg@ericsson.com]
Sent: 25 June 2007 = 12:22
To: pcn@ietf.org
Subject: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt

 

Dear all

The "LC-PCN - The Load Control PCN solution" draft can be = found via:
http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-co= ntrol-00.txt


Abstract

There is an increased interest of simple and scalable resource = provisioning
solution for Diffserv network.
The Load Control PCN (LC-PCN) addresses the following issues:

1. Admission control for real time data flows in stateless Diffserv = Domains
2. Flow termination: Termination of flows in case of exceptional = events,
such as severe congestion after re-routing.
Admission control in a Diffserv stateless domain is a combination = of:

  1. Probing, whereby a probe packet is
   sent along the forwarding path in a network to = determine
   whether a flow can be admitted based upon the current
   congestion state of the network

  2. Admission control based on data marking, whereby in = congestion
    situations the data packets are marked to notify the = egress node
    that a congestion occurred on a particular ingress to = egress
    path.
    The scheme provides the capability of controlling the traffic load in
    the network without requiring signaling or any = per-flow processing in
    the core routers. The complexity of Load Control is = kept to a minimum
    to make implementation simple.

Kind regards,

Lars

=00 ------_=_NextPart_001_01C7CA10.3C416E16-- --===============0664784525== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0664784525==-- From pcn-bounces@ietf.org Thu Jul 19 12:01:18 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYRK-00029V-PD; Thu, 19 Jul 2007 12:01:18 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBYRK-00028n-4u for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 12:01:18 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYRJ-00027l-NN for pcn@ietf.org; Thu, 19 Jul 2007 12:01:17 -0400 Received: from smtp3.smtp.bt.com ([217.32.164.138]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBYRJ-0004j9-0T for pcn@ietf.org; Thu, 19 Jul 2007 12:01:17 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp3.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 19 Jul 2007 17:01:15 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Subject: RE: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Date: Thu, 19 Jul 2007 17:01:15 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC347@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC344@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Thread-Index: Ace3GxtZWDEHRn83T/m3IGeLNeDF2AS8YfSwAANKUAA= From: To: , X-OriginalArrivalTime: 19 Jul 2007 16:01:15.0509 (UTC) FILETIME=[092C8250:01C7CA1E] X-Spam-Score: 0.0 (/) X-Scan-Signature: 69ad46fbd0e474a7c7f3312d9e320336 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1467442552==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============1467442552== Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7CA1E.091E0798" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7CA1E.091E0798 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Lars =20 I have just been reading http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt. it seems a very similar proposal? So one way it might be useful to clarify your proposal is to compare it with the babiarz proposal. =20 Could you clarify how it differs: * in the 2 algorithms at the PCN-interior-nodes, ie for admission-marking & termination-marking * in the encoding used for for admission-marking & termination-marking (I think it's simply that draft-babiarz doesn't define encodings (ECN field mentioned in passing), whereas draft-westberg says use new dscps). * in the reaction at the PCN-boundary-nodes =20 thanks, phil -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com]=20 Sent: 19 July 2007 15:22 To: Lars.westberg@ericsson.com; pcn@ietf.org Subject: RE: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt =20 Lars =20 I started reading your draft, but have a couple of clarification questions about what you're proposing. =20 As I understand it:- * there are two marking algorithms on the interior routers * Admission-marking: if the rate exceeds threshold-1, then all pkts are Adm marked * Termination-marking: if the rate exceeds threshold-2, the excess-traffic rate is measured and a fraction (1/N) of the excess rate is Termination marked. =20 The adm marking algo is a bit unclear to me, sometimes it's described as marking all pkts as soon as threshold-1 is exceeded - sometimes (eg S4.1.3) it seems that a fraction of the excess traffic is marked (same idea as above under " * Termination marked"). Which is correct? =20 I'm also not sure what "encoded DSCP" and "notified DSCP" mean. Do they correspond to Admission-marking and Termination-marking, or do they mean something else? =20 A point that doesn't just apply to this draft: http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-pkt-mark-00. txt which looks at "whether to allow for packet size when the network codes or when the transport decodes congestion notification." This draft argues that, when marking, the packet size should not be taken into account.=20 =20 Thanks phil =20 -----Original Message----- From: Lars Westberg [mailto:Lars.westberg@ericsson.com]=20 Sent: 25 June 2007 12:22 To: pcn@ietf.org Subject: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt =20 Dear all The "LC-PCN - The Load Control PCN solution" draft can be found via: http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-control-00.t xt Abstract There is an increased interest of simple and scalable resource provisioning solution for Diffserv network. The Load Control PCN (LC-PCN) addresses the following issues: 1. Admission control for real time data flows in stateless Diffserv Domains 2. Flow termination: Termination of flows in case of exceptional events, such as severe congestion after re-routing. Admission control in a Diffserv stateless domain is a combination of: 1. Probing, whereby a probe packet is sent along the forwarding path in a network to determine whether a flow can be admitted based upon the current congestion state of the network 2. Admission control based on data marking, whereby in congestion situations the data packets are marked to notify the egress node that a congestion occurred on a particular ingress to egress path. The scheme provides the capability of controlling the traffic load in the network without requiring signaling or any per-flow processing in the core routers. The complexity of Load Control is kept to a minimum to make implementation simple. Kind regards, Lars ------_=_NextPart_001_01C7CA1E.091E0798 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Lars

 

I have just been reading = http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt. it seems a very similar proposal? So one way it might be useful to clarify your proposal is to compare it with the = babiarz proposal.

 

Could you clarify how it differs:

* in the 2 algorithms at the =
PCN-interior-nodes, ie for admission-marking & =
termination-marking
* in the =
encoding used for for admission-marking & termination-marking (I =
think it’s simply that draft-babiarz doesn’t define =
encodings (ECN field mentioned in passing), whereas draft-westberg says =
use new dscps).
* in the =
reaction at the PCN-boundary-nodes

 

thanks,

phil

-----Origi= nal Message-----
From: = philip.eardley@bt.com [mailto:philip.eardley@bt.com]
Sent: 19 July 2007 15:22
To: = Lars.westberg@ericsson.com; pcn@ietf.org
Subject: RE: [PCN] Fwd: = I-D ACTION:draft-westberg-pcn-load-control-00.txt

 

Lars

 

I started reading your draft, but = have a couple of clarification questions about what you’re = proposing.

 

As I understand = it:-

* there are two marking algorithms = on the interior routers

* Admission-marking: if the rate = exceeds threshold-1, then all pkts are Adm marked

* Termination-marking: if the rate = exceeds threshold-2, the excess-traffic rate is measured and a fraction (1/N) of = the excess rate is Termination marked.

 

The adm marking algo is a bit = unclear to me, sometimes it’s described as marking all pkts as soon as = threshold-1 is exceeded – sometimes (eg S4.1.3) it seems that a fraction of = the excess traffic is marked (same idea as above under “ * Termination marked”). Which is correct?

 

I’m also not sure what “encoded DSCP” and “notified DSCP” mean. Do they correspond to Admission-marking and Termination-marking, or do they mean something else?

 

A point that doesn’t just = apply to this draft:

http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-p=
kt-mark-00.txt which looks at “whether to allow =
for packet size when the network codes or when the transport decodes =
congestion notification.” This draft argues that, when marking, =
the packet size should not be taken into account. 
 
Thanks
phil

 

-----Origi= nal Message-----
From: Lars Westberg [mailto:Lars.westberg@ericsson.com]
Sent: 25 June 2007 = 12:22
To: pcn@ietf.org
Subject: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt

 

Dear all

The "LC-PCN - The Load Control PCN solution" draft can be = found via:
http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-co= ntrol-00.txt


Abstract

There is an increased interest of simple and scalable resource = provisioning
solution for Diffserv network.
The Load Control PCN (LC-PCN) addresses the following issues:

1. Admission control for real time data flows in stateless Diffserv = Domains
2. Flow termination: Termination of flows in case of exceptional = events,
such as severe congestion after re-routing.
Admission control in a Diffserv stateless domain is a combination = of:

  1. Probing, whereby a probe packet is
   sent along the forwarding path in a network to = determine
   whether a flow can be admitted based upon the current
   congestion state of the network

  2. Admission control based on data marking, whereby in = congestion
    situations the data packets are marked to notify the = egress node
    that a congestion occurred on a particular ingress to = egress
    path.
    The scheme provides the capability of controlling the traffic load in
    the network without requiring signaling or any = per-flow processing in
    the core routers. The complexity of Load Control is = kept to a minimum
    to make implementation simple.

Kind regards,

Lars

=00 ------_=_NextPart_001_01C7CA1E.091E0798-- --===============1467442552== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============1467442552==-- From pcn-bounces@ietf.org Thu Jul 19 12:07:03 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYWt-0007Ta-9p; Thu, 19 Jul 2007 12:07:03 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBYWr-0007Qd-5v for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 12:07:01 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYWq-0007QA-Rw for pcn@ietf.org; Thu, 19 Jul 2007 12:07:00 -0400 Received: from smtp2.smtp.bt.com ([217.32.164.150]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBYWp-0002cv-DF for pcn@ietf.org; Thu, 19 Jul 2007 12:07:00 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 19 Jul 2007 17:06:58 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt Date: Thu, 19 Jul 2007 17:06:57 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC348@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <9671A92C3C8B5744BC97F855F7CB64651115D555@zcarhxm1.corp.nortel.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt Thread-Index: Ace9iWWi634qt9N+RbasyEGXvJ9y5AAC1p1wAyJfK+A= From: To: , X-OriginalArrivalTime: 19 Jul 2007 16:06:58.0006 (UTC) FILETIME=[D5516760:01C7CA1E] X-Spam-Score: 0.0 (/) X-Scan-Signature: 944ecb6e61f753561f559a497458fb4f Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Joe Your draft has the slow-down parameter "s" (when ET-marking =3D=3D termination-marking, measure the excess traffic rate and actually mark a fraction (1/s) of this rate). Does "s" have to be the same on all routers in the PCN-domain? I'm not sure this is a requirement, but what would happen if the "s" parameter was different?=20 Thanks Phil/=20 > -----Original Message----- > From: Jozef Babiarz [mailto:babiarz@nortel.com] > Sent: 03 July 2007 18:18 > To: pcn@ietf.org > Subject: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt >=20 > Hi all, > In an email below there is a link to 00 version of pcn-3sm draft that > defines metering and marking for admission control and flow termination. > We call it three state PCN marking because there are three conditions, > packets are not marked, packets marked to indicate that admission of > additional flows should be stopped and finally condition where flows are > marked to indicate that termination is needed. This draft incorporates > the metering and marking approach for flow termination that was defined > in draft-babiarz-pcn-explicit-marking-00. >=20 > Simulation results for the proposed "AR-metering and AS-re-marking" and > "SR-metering and ET-re-marking" will be published in a separate draft. >=20 > Regards, Joe > email:babiarz@nortel.com > Telephone:613-763-6098 > -----Original Message----- > From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org] > Sent: July 3, 2007 11:15 AM > To: i-d-announce@ietf.org > Subject: I-D ACTION:draft-babiarz-pcn-3sm-00.txt >=20 > A New Internet-Draft is available from the on-line Internet-Drafts > directories. >=20 >=20 > Title : Three State PCN Marking > Author(s) : J. Babiarz, et al. > Filename : draft-babiarz-pcn-3sm-00.txt > Pages : 24 > Date : 2007-7-3 >=20 > This document proposes metering and marking mechanisms for PCN- > enabled nodes to label packets with pre-congestion information. The > marker marks all PCN packets with an admission-stop (AS) codepoint if > the PCN traffic rate on a link exceeds its admissible rate (AR) and > when it exceeds its supportable rate (SR), it marks some of those > packets exceeding SR with an excess-traffic (ET) codepoint. The > flows with ET-marked packets will be terminated until the aggregate > PCN traffic on the path decreases below its SR. This document > proposes metering and marking mechanisms for these objectives. >=20 >=20 > A URL for this Internet-Draft is: > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt >=20 > To remove yourself from the I-D Announcement list, send a message to > i-d-announce-request@ietf.org with the word unsubscribe in the body of > the message. > You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce > to change your subscription settings. >=20 > Internet-Drafts are also available by anonymous FTP. Login with the > username "anonymous" and a password of your e-mail address. After > logging in, type "cd internet-drafts" and then > "get draft-babiarz-pcn-3sm-00.txt". >=20 > A list of Internet-Drafts directories can be found in > http://www.ietf.org/shadow.html > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >=20 > Internet-Drafts can also be obtained by e-mail. >=20 > Send a message to: > mailserv@ietf.org. > In the body type: > "FILE /internet-drafts/draft-babiarz-pcn-3sm-00.txt". >=20 > NOTE: The mail server at ietf.org can return the document in > MIME-encoded form by using the "mpack" utility. To use this > feature, insert the command "ENCODING mime" before the "FILE" > command. To decode the response(s), you will need "munpack" or > a MIME-compliant mail reader. Different MIME-compliant mail > readers > exhibit different behavior, especially when dealing with > "multipart" MIME messages (i.e. documents which have been split > up into multiple messages), so check your local documentation on > how to manipulate these messages. >=20 > Below is the data which will enable a MIME compliant mail reader > implementation to automatically retrieve the ASCII version of the > Internet-Draft. _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 19 12:12:48 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYcS-0006N4-P4; Thu, 19 Jul 2007 12:12:48 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBYcR-0006MZ-0z for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 12:12:47 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYcQ-0006MQ-ND for pcn@ietf.org; Thu, 19 Jul 2007 12:12:46 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBYcO-0002kx-SN for pcn@ietf.org; Thu, 19 Jul 2007 12:12:46 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 1A07F847C; Thu, 19 Jul 2007 18:12:44 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 0C659ADCC; Thu, 19 Jul 2007 18:12:44 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id CB3FAAE0D; Thu, 19 Jul 2007 18:12:43 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6JGChh11598; Thu, 19 Jul 2007 18:12:43 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id BB0076F58E; Thu, 19 Jul 2007 18:06:58 +0200 (CEST) Message-ID: <469F8CB0.7080602@informatik.uni-wuerzburg.de> Date: Thu, 19 Jul 2007 18:09:20 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: philip.eardley@bt.com Subject: Re: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC347@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC347@E03MVZ1-UKDY.domain1.systemhost.net> Content-Type: text/plain; charset=windows-1252; format=flowed X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Scan-Signature: 42e3ed3f10a1d8bef690f09da16f507a Cc: pcn@ietf.org, Lars.westberg@ericsson.com X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil, the following is the contribution of the 3sm draft: 1) It proposes marked flow termination (aka explicit marking) which is a=20 flow termination method alternative to the one presented in the cl-draft. 2) It proposes the behavior of the meters and markers that may be used=20 in the cl-draft and and for the new termination scheme. This is not=20 covered by the load-control draft in such detail. We do not define encodings as this is done by other documents. Regards, Michael philip.eardley@bt.com wrote: > > Lars > > I have just been reading=20 > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt. it=20 > seems a very similar proposal? So one way it might be useful to=20 > clarify your proposal is to compare it with the babiarz proposal. > > Could you clarify how it differs: > > * in the 2 algorithms at the PCN-interior-nodes, ie for admission-marki= ng & termination-marking > * in the encoding used for for admission-marking & termination-marking = (I think it=92s simply that draft-babiarz doesn=92t define encodings (ECN= field mentioned in passing), whereas draft-westberg says use new dscps). > * in the reaction at the PCN-boundary-nodes > > thanks, > > phil > > -----Original Message----- > *From:* philip.eardley@bt.com [mailto:philip.eardley@bt.com] > *Sent:* 19 July 2007 15:22 > *To:* Lars.westberg@ericsson.com; pcn@ietf.org > *Subject:* RE: [PCN] Fwd: I-D=20 > ACTION:draft-westberg-pcn-load-control-00.txt > > Lars > > I started reading your draft, but have a couple of clarification=20 > questions about what you=92re proposing. > > As I understand it:- > > * there are two marking algorithms on the interior routers > > * Admission-marking: if the rate exceeds threshold-1, then all pkts=20 > are Adm marked > > * Termination-marking: if the rate exceeds threshold-2, the=20 > excess-traffic rate is measured and a fraction (1/N) of the excess=20 > rate is Termination marked. > > The adm marking algo is a bit unclear to me, sometimes it=92s described= =20 > as marking all pkts as soon as threshold-1 is exceeded =96 sometimes (e= g=20 > S4.1.3) it seems that a fraction of the excess traffic is marked (same=20 > idea as above under =93 * Termination marked=94). Which is correct? > > I=92m also not sure what =93encoded DSCP=94 and =93notified DSCP=94 mea= n. Do=20 > they correspond to Admission-marking and Termination-marking, or do=20 > they mean something else? > > A point that doesn=92t just apply to this draft: > > http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-pkt-mark-00= .txt which looks at =93whether to allow for packet size when the network = codes or when the transport decodes congestion notification.=94 This draf= t argues that, when marking, the packet size should not be taken into acc= ount.=20 > =20 > Thanks > phil > > -----Original Message----- > *From:* Lars Westberg [mailto:Lars.westberg@ericsson.com] > *Sent:* 25 June 2007 12:22 > *To:* pcn@ietf.org > *Subject:* [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt > > Dear all > > The "LC-PCN - The Load Control PCN solution" draft can be found via: > http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-control-00.= txt > > > Abstract > > There is an increased interest of simple and scalable resource=20 > provisioning > solution for Diffserv network. > The Load Control PCN (LC-PCN) addresses the following issues: > > 1. Admission control for real time data flows in stateless Diffserv=20 > Domains > 2. Flow termination: Termination of flows in case of exceptional events= , > such as severe congestion after re-routing. > Admission control in a Diffserv stateless domain is a combination of: > > 1. Probing, whereby a probe packet is > sent along the forwarding path in a network to determine > whether a flow can be admitted based upon the current > congestion state of the network > > 2. Admission control based on data marking, whereby in congestion > situations the data packets are marked to notify the egress node > that a congestion occurred on a particular ingress to egress > path. > The scheme provides the capability of controlling the traffic load in > the network without requiring signaling or any per-flow processing in > the core routers. The complexity of Load Control is kept to a minimum > to make implementation simple. > > Kind regards, > > Lars > > -----------------------------------------------------------------------= - > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > =20 --=20 Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 19 12:22:24 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYlk-00040g-PT; Thu, 19 Jul 2007 12:22:24 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBYlj-00040Z-C9 for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 12:22:23 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBYlj-00040R-2T for pcn@ietf.org; Thu, 19 Jul 2007 12:22:23 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBYlh-00030o-JF for pcn@ietf.org; Thu, 19 Jul 2007 12:22:23 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 2BF687DF9; Thu, 19 Jul 2007 18:22:21 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 1E57C7DFD; Thu, 19 Jul 2007 18:22:21 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id F302D7DF9; Thu, 19 Jul 2007 18:22:20 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6JGMKh11746; Thu, 19 Jul 2007 18:22:20 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 07BA36F58E; Thu, 19 Jul 2007 18:16:36 +0200 (CEST) Message-ID: <469F8EF2.4010602@informatik.uni-wuerzburg.de> Date: Thu, 19 Jul 2007 18:18:58 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: philip.eardley@bt.com Subject: Re: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC348@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC348@E03MVZ1-UKDY.domain1.systemhost.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: d2b46e3b2dfbff2088e0b72a54104985 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil, we do not require the slowdown parameter "s" to be the same for all links, but I currently cannot think of a case where it would be of a benefit when different values are used. It controls the aggressiveness of the marking and termination, therefore, it could be useful to have it different for different links. Maybe simulations will show ...? Regards, Michael philip.eardley@bt.com wrote: > Joe > > Your draft has the slow-down parameter "s" (when ET-marking == > termination-marking, measure the excess traffic rate and actually mark a > fraction (1/s) of this rate). > > Does "s" have to be the same on all routers in the PCN-domain? I'm not > sure this is a requirement, but what would happen if the "s" parameter > was different? > > Thanks > Phil/ > > >> -----Original Message----- >> From: Jozef Babiarz [mailto:babiarz@nortel.com] >> Sent: 03 July 2007 18:18 >> To: pcn@ietf.org >> Subject: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt >> >> Hi all, >> In an email below there is a link to 00 version of pcn-3sm draft that >> defines metering and marking for admission control and flow >> > termination. > >> We call it three state PCN marking because there are three conditions, >> packets are not marked, packets marked to indicate that admission of >> additional flows should be stopped and finally condition where flows >> > are > >> marked to indicate that termination is needed. This draft incorporates >> the metering and marking approach for flow termination that was >> > defined > >> in draft-babiarz-pcn-explicit-marking-00. >> >> Simulation results for the proposed "AR-metering and AS-re-marking" >> > and > >> "SR-metering and ET-re-marking" will be published in a separate draft. >> >> Regards, Joe >> email:babiarz@nortel.com >> Telephone:613-763-6098 >> -----Original Message----- >> From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org] >> Sent: July 3, 2007 11:15 AM >> To: i-d-announce@ietf.org >> Subject: I-D ACTION:draft-babiarz-pcn-3sm-00.txt >> >> A New Internet-Draft is available from the on-line Internet-Drafts >> directories. >> >> >> Title : Three State PCN Marking >> Author(s) : J. Babiarz, et al. >> Filename : draft-babiarz-pcn-3sm-00.txt >> Pages : 24 >> Date : 2007-7-3 >> >> This document proposes metering and marking mechanisms for PCN- >> enabled nodes to label packets with pre-congestion information. >> > The > >> marker marks all PCN packets with an admission-stop (AS) codepoint >> > if > >> the PCN traffic rate on a link exceeds its admissible rate (AR) and >> when it exceeds its supportable rate (SR), it marks some of those >> packets exceeding SR with an excess-traffic (ET) codepoint. The >> flows with ET-marked packets will be terminated until the aggregate >> PCN traffic on the path decreases below its SR. This document >> proposes metering and marking mechanisms for these objectives. >> >> >> A URL for this Internet-Draft is: >> http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt >> >> To remove yourself from the I-D Announcement list, send a message to >> i-d-announce-request@ietf.org with the word unsubscribe in the body of >> the message. >> You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce >> to change your subscription settings. >> >> Internet-Drafts are also available by anonymous FTP. Login with the >> username "anonymous" and a password of your e-mail address. After >> logging in, type "cd internet-drafts" and then >> "get draft-babiarz-pcn-3sm-00.txt". >> >> A list of Internet-Drafts directories can be found in >> http://www.ietf.org/shadow.html >> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> >> Internet-Drafts can also be obtained by e-mail. >> >> Send a message to: >> mailserv@ietf.org. >> In the body type: >> "FILE /internet-drafts/draft-babiarz-pcn-3sm-00.txt". >> >> NOTE: The mail server at ietf.org can return the document in >> MIME-encoded form by using the "mpack" utility. To use this >> feature, insert the command "ENCODING mime" before the "FILE" >> command. To decode the response(s), you will need "munpack" or >> a MIME-compliant mail reader. Different MIME-compliant mail >> readers >> exhibit different behavior, especially when dealing with >> "multipart" MIME messages (i.e. documents which have been split >> up into multiple messages), so check your local documentation on >> how to manipulate these messages. >> >> Below is the data which will enable a MIME compliant mail reader >> implementation to automatically retrieve the ASCII version of the >> Internet-Draft. >> > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 19 12:50:07 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBZCZ-0002Ym-Kn; Thu, 19 Jul 2007 12:50:07 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBZCY-0002Yh-45 for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 12:50:06 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBZCX-0002YZ-Oi for pcn@ietf.org; Thu, 19 Jul 2007 12:50:05 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBZCX-0005u4-1H for pcn@ietf.org; Thu, 19 Jul 2007 12:50:05 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6JGo1o19306; Thu, 19 Jul 2007 16:50:02 GMT X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt Date: Thu, 19 Jul 2007 12:49:59 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651155EFE5@zcarhxm1.corp.nortel.com> In-Reply-To: <469F8EF2.4010602@informatik.uni-wuerzburg.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt Thread-Index: AcfKIP9/2/T+enGZR1eloQg3OmqJUwAAHv9A References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC348@E03MVZ1-UKDY.domain1.systemhost.net> <469F8EF2.4010602@informatik.uni-wuerzburg.de> From: "Jozef Babiarz" To: , X-Spam-Score: 0.0 (/) X-Scan-Signature: 33cc095b503da4365ce57c727e553cf1 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil, just to add to what Michael wrote, there is no requirement for "s" to be the same value within a domain. We have done simulations with several different values and the "s" parameter controls how aggressively overload condition is removed. In our simulations, we have used the following formula to calculate a value for s for voice traffic; IP data rate of a flow (G.711 codec) x RTT (total route trip delay ingress to egress) x 2 =3D s. As Michael indicated we still need to do a bit more work to provide guideless on a range of values for s that would be good to use in a single domain, and multi domains.=20 Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de]=20 Sent: July 19, 2007 12:19 PM To: philip.eardley@bt.com Cc: Babiarz, Jozef (CAR:0S03); pcn@ietf.org Subject: Re: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt Hi Phil, we do not require the slowdown parameter "s" to be the same for all=20 links, but I currently cannot think of a case where it would be of a=20 benefit when different values are used. It controls the aggressiveness=20 of the marking and termination, therefore, it could be useful to have it different for different links. Maybe simulations will show ...? Regards, Michael philip.eardley@bt.com wrote: > Joe > > Your draft has the slow-down parameter "s" (when ET-marking =3D=3D > termination-marking, measure the excess traffic rate and actually mark a > fraction (1/s) of this rate). > > Does "s" have to be the same on all routers in the PCN-domain? I'm not > sure this is a requirement, but what would happen if the "s" parameter > was different?=20 > > Thanks > Phil/=20 > > =20 >> -----Original Message----- >> From: Jozef Babiarz [mailto:babiarz@nortel.com] >> Sent: 03 July 2007 18:18 >> To: pcn@ietf.org >> Subject: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt >> >> Hi all, >> In an email below there is a link to 00 version of pcn-3sm draft that >> defines metering and marking for admission control and flow >> =20 > termination. > =20 >> We call it three state PCN marking because there are three conditions, >> packets are not marked, packets marked to indicate that admission of >> additional flows should be stopped and finally condition where flows >> =20 > are > =20 >> marked to indicate that termination is needed. This draft incorporates >> the metering and marking approach for flow termination that was >> =20 > defined > =20 >> in draft-babiarz-pcn-explicit-marking-00. >> >> Simulation results for the proposed "AR-metering and AS-re-marking" >> =20 > and > =20 >> "SR-metering and ET-re-marking" will be published in a separate draft. >> >> Regards, Joe >> email:babiarz@nortel.com >> Telephone:613-763-6098 >> -----Original Message----- >> From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org] >> Sent: July 3, 2007 11:15 AM >> To: i-d-announce@ietf.org >> Subject: I-D ACTION:draft-babiarz-pcn-3sm-00.txt >> >> A New Internet-Draft is available from the on-line Internet-Drafts >> directories. >> >> >> Title : Three State PCN Marking >> Author(s) : J. Babiarz, et al. >> Filename : draft-babiarz-pcn-3sm-00.txt >> Pages : 24 >> Date : 2007-7-3 >> >> This document proposes metering and marking mechanisms for PCN- >> enabled nodes to label packets with pre-congestion information. >> =20 > The > =20 >> marker marks all PCN packets with an admission-stop (AS) codepoint >> =20 > if > =20 >> the PCN traffic rate on a link exceeds its admissible rate (AR) and >> when it exceeds its supportable rate (SR), it marks some of those >> packets exceeding SR with an excess-traffic (ET) codepoint. The >> flows with ET-marked packets will be terminated until the aggregate >> PCN traffic on the path decreases below its SR. This document >> proposes metering and marking mechanisms for these objectives. >> >> >> A URL for this Internet-Draft is: >> http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt >> >> To remove yourself from the I-D Announcement list, send a message to >> i-d-announce-request@ietf.org with the word unsubscribe in the body of >> the message. >> You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce >> to change your subscription settings. >> >> Internet-Drafts are also available by anonymous FTP. Login with the >> username "anonymous" and a password of your e-mail address. After >> logging in, type "cd internet-drafts" and then >> "get draft-babiarz-pcn-3sm-00.txt". >> >> A list of Internet-Drafts directories can be found in >> http://www.ietf.org/shadow.html >> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> >> Internet-Drafts can also be obtained by e-mail. >> >> Send a message to: >> mailserv@ietf.org. >> In the body type: >> "FILE /internet-drafts/draft-babiarz-pcn-3sm-00.txt". >> >> NOTE: The mail server at ietf.org can return the document in >> MIME-encoded form by using the "mpack" utility. To use this >> feature, insert the command "ENCODING mime" before the "FILE" >> command. To decode the response(s), you will need "munpack" or >> a MIME-compliant mail reader. Different MIME-compliant mail >> readers >> exhibit different behavior, especially when dealing with >> "multipart" MIME messages (i.e. documents which have been split >> up into multiple messages), so check your local documentation on >> how to manipulate these messages. >> >> Below is the data which will enable a MIME compliant mail reader >> implementation to automatically retrieve the ASCII version of the >> Internet-Draft. >> =20 > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > =20 --=20 Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 19 14:56:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBbAb-0007Jb-5b; Thu, 19 Jul 2007 14:56:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBbAZ-0007IF-K5 for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 14:56:11 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBbAZ-0007HA-4b for pcn@ietf.org; Thu, 19 Jul 2007 14:56:11 -0400 Received: from hiltonsmtp.worldspice.net ([216.37.94.58]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBbAY-0001dg-Hp for pcn@ietf.org; Thu, 19 Jul 2007 14:56:11 -0400 Received: (qmail 27693 invoked by uid 0); 19 Jul 2007 18:48:41 -0000 Received: by simscan 1.2.0 ppid: 27675, pid: 27688, t: 1.0148s scanners: clamav: 0.90.2/m: spam: 3.1.8 X-Spam-Checker-Version: SpamAssassin 3.2.1 (2007-05-02) on hiltonsmtp.worldspice.net X-Spam-Level: ***** X-Spam-Status: No, score=5.4 required=6.5 tests=BAYES_99,DATE_IN_PAST_06_12, RDNS_NONE autolearn=disabled version=3.2.1 Received: from unknown (HELO ?172.28.169.147?) (67.97.210.2) by hiltonsmtp.worldspice.net with SMTP; 19 Jul 2007 18:48:40 -0000 Mime-Version: 1.0 (Apple Message framework v752.3) To: pcn@ietf.org Message-Id: From: Lars Eggert Date: Thu, 19 Jul 2007 06:37:59 -0500 X-Mailer: Apple Mail (2.752.3) X-Spam-Score: 1.9 (+) X-Scan-Signature: c54bc2f42d02429833c0ca4b8725abd7 Subject: [PCN] questions after a lot of reading X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0034626255==" Errors-To: pcn-bounces@ietf.org --===============0034626255== Content-Type: multipart/signed; micalg=sha1; boundary=Apple-Mail-5-379449835; protocol="application/pkcs7-signature" --Apple-Mail-5-379449835 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi, after reading over the set of PCN drafts, I was left with a number of questions. These aren't detailed comments on the individual documents but rather higher-level questions about the architecture. I'm posting them now in order to jumpstart the discussion during the PCN session next week. I apologize that the questions go a bit all over the place. I'm trying to order them in a way that can be followed. [1] Semantics of the stop-admission signals Pre-congested routers piggyback admission markings onto the traffic flowing through them. The egress that analyzes the volume and dynamics of these markings and may make a stop-admission decision, which it then signals to the ingress. Agreement so far? OK, then: What is the semantics of the stop-admission signal? A simple "stop admitting new flows" seems to require a complementary "start admitting new flows" signal. Or is it "stop admitting new flows for a time x", which would not need that second signal? The latter seems conceptually simpler and may arguably be a bit more robust, because the system will un-wedge itself if the "start- admission signal" gets lost. But this approach might end up causing fluctuations during periods of pre-congestion that are significantly longer than x. (Do we expect to support cases where a domain is in a pre-congested state for prolonged periods of time?) (For the "termination" signal going from the egress to the ingress, I guess the semantics are clear.) [2] Implications of multi-marking schemes I must admit that so far, I have mostly thought of PCN in terms of something similar to Anna's single-marking proposal. Meaning that the egress would come to a termination decision (rather than a stop- admission decision) when the volume or dynamics of the arriving markings becomes severe. (Note: That's not to say that I necessarily believe that single- marking should be the technical solution the WG should pick; all I'm saying is that I had so far thought about PCN mostly in this way.) Reading some of the proposals that use multiple kinds of markings made me realize that I had made some implicit assumptions about how the termination mechanism might operate that were a cause of thinking in terms of using a single marking. After reading the multi-marking proposals, I'm not sure if these assumptions are shared by all of the group. I'm also not sure if there is an agreement among the different multi-marking proposals, either. With a multi-marking scheme, when a congested router marks packets with _termination_ marks, does it matter _which_ packets (and hence which flows) are marked? Is there an assumption that the system will terminate those and only those flows? Or is termination marking similar to admission marking, for which piggybacking them onto the current traffic stream is simply a convenient transport mechanism? Meaning that in the latter case, the egress is free to terminate flows whose packets didn't have congestion markings, and let flows remain whose packets did, as long as whatever decision it comes to alleviates the congestion? Schemes where the termination decision is influenced by which flows have received termination marks seem to require per-flow state at the routers, because they need to be sure that they terminate a sufficient volume of traffic. That seems to conflict with the goal of the architecture to limit that such state to the domain boundary, right? [3] Marking dynamics I've seen two ways in the documents that describe how routers should mark packets: First, a scheme where the frequency at which a router marks packets is proportional to some level of pre-congestion or congestion. Second, a scheme where a router starts marking _all_ packets when congestion exceeds a certain level. The first scheme transmits much finer-grained information from the routers to the egress, which should benefit the decision algorithm there. The second scheme basically signals a binary condition. I can't come up with a reason why the second scheme should be the better one - can anyone explain? Thanks and see you next week, Lars --Apple-Mail-5-379449835 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name=smime.p7s Content-Disposition: attachment; filename=smime.p7s MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGQDCCAvkw ggJioAMCAQICEGtxkLFHQu1g67hlmYfwPuIwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UEBhMCWkEx JTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQ ZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA3MDEwNDE2MTE1NFoXDTA4MDEwNDE2MTE1 NFowXDEPMA0GA1UEBBMGRWdnZXJ0MQ0wCwYDVQQqEwRMYXJzMRQwEgYDVQQDEwtMYXJzIEVnZ2Vy dDEkMCIGCSqGSIb3DQEJARYVbGFycy5lZ2dlcnRAbm9raWEuY29tMIIBIjANBgkqhkiG9w0BAQEF AAOCAQ8AMIIBCgKCAQEA26hjntVPZMiwh4d8tyuk9KiucvG92BVUGArk5zO1jhmq7tLFgU1mqcIg VGumfQqjkAzIuh83kxIiqBrB05Wvxp85apwt4sUCvzMe8mQWzZZZYp0rBzwpOj+VC5pxsMRYtYW+ BaTFBEmvFr7D7C7roZUk0lDppS5SZFs4SQbEe9ykB9aeUf1iTiw2+ikyP2+JEYto14WYCoxFWbms FbQ1uaaK+yn1WH2YHhyMfi0IOxuT0jtbsngjHJMpWIqq334zBhj+rPSUug47YBHr41FCDMHbbbjv WbyTyDYneOW3WY8LY8bGWVlAknQGB7lgduShe6e0RI/7SL/VE6X27lM9LwIDAQABozIwMDAgBgNV HREEGTAXgRVsYXJzLmVnZ2VydEBub2tpYS5jb20wDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQUF AAOBgQCx3nxxTg/WowobVTRXBiXUEEZj4LBiunWbuAnR0UbJIgijvq3JbiJvZo2gUGiW9LPaHSBz 4oxT1VR/S/6O0a4e87oV5cOQm6ReB68o9rDfUzxHTwoCfv2wwMwBrXyzQMjyQK4Lt8siV41gmZpm rSXMhjTJdd9uYYNoZKQLq+VM+TCCAz8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAwgdExCzAJ BgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2VydmljZXMg RGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkGCSqGSIb3 DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMzA3MTcwMDAwMDBaFw0xMzA3 MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5 KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQTCBnzAN BgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV+065yplaHmjAdQRwnd/p/6Me7L3N9VvyGna9 fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqqP3FWy688Cwfn8R+RNiQqE88r1fOCdz0Dviv+ uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEEQB5kGXJgt/sCAwEAAaOBlDCBkTASBgNVHRMB Af8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2oDSGMmh0dHA6Ly9jcmwudGhhd3RlLmNvbS9UaGF3 dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3JsMAsGA1UdDwQEAwIBBjApBgNVHREEIjAgpB4wHDEaMBgG A1UEAxMRUHJpdmF0ZUxhYmVsMi0xMzgwDQYJKoZIhvcNAQEFBQADgYEASIzRUIPqCy7MDaNmrGcP f6+svsIXoUOWlJ1/TCG4+DYfqi2fNi/A9BxQIJNwPP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH 2ydxVyWN3amcOY6MIE9lX5Xa9/eH1sYITq726jTlEBpbNU1341YheILcIRk13iSx0x1G/11fZU8x ggMQMIIDDAIBATB2MGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAo UHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIQ a3GQsUdC7WDruGWZh/A+4jAJBgUrDgMCGgUAoIIBbzAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcB MBwGCSqGSIb3DQEJBTEPFw0wNzA3MTkxMTM3NjBaMCMGCSqGSIb3DQEJBDEWBBS63aSyJV1QzHDY p5c2AL4uefzfADCBhQYJKwYBBAGCNxAEMXgwdjBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhh d3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0ECEGtxkLFHQu1g67hlmYfwPuIwgYcGCyqGSIb3DQEJEAILMXigdjBiMQsw CQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UE AxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEGtxkLFHQu1g67hlmYfwPuIw DQYJKoZIhvcNAQEBBQAEggEAWxrMz24xOMrkR5CAWCJLD2DuLCwsb/puRx9YehJ2jOHBc1NK8wSi 5FLvdYAzv8DTfClgu+i5QcCKvfMllmb07+wgO+PrEu7nOUB72T2ja5I3j+a+cKQnyZnrsIQiNNzL c90x84A1loQrdbbucP9tRxoR6luXu/gPd0oXd72LMoArL2nHLsHqAr7rBrd1Klp6Zb8WDfU20b2h LeLCQz6dOqhh93zm6VxP446prFEKE4B64RC6NUAb/+G2V47DYNWljtsgWBhubBHvjm7PajEYYLJC i6uXXgrv1JkPtPJ2prHb27uzNkwxASKgz5c2O1CriBEW18S/XbHa+u5dFweMwgAAAAAAAA== --Apple-Mail-5-379449835-- --===============0034626255== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0034626255==-- From pcn-bounces@ietf.org Thu Jul 19 17:32:18 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBdbe-0006B2-GL; Thu, 19 Jul 2007 17:32:18 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBdbd-0006Au-AJ for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 17:32:17 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBdbd-0006Al-0G for pcn@ietf.org; Thu, 19 Jul 2007 17:32:17 -0400 Received: from imr1.ericy.com ([198.24.6.9]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBdbb-0002zS-Iv for pcn@ietf.org; Thu, 19 Jul 2007 17:32:16 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr1.ericy.com (8.13.1/8.13.1) with ESMTP id l6JLaemA008626 for ; Thu, 19 Jul 2007 16:36:41 -0500 Received: from eusrcmw750.eamcs.ericsson.se ([138.85.77.50]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Thu, 19 Jul 2007 16:32:14 -0500 Received: from [147.117.169.165] ([147.117.169.165]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Thu, 19 Jul 2007 16:32:14 -0500 From: Steven Blake To: pcn Content-Type: text/plain Organization: Ericsson IP Infrastructure Date: Thu, 19 Jul 2007 17:32:14 -0400 Message-Id: <1184880734.23599.18.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 19 Jul 2007 21:32:14.0364 (UTC) FILETIME=[45F94DC0:01C7CA4C] X-Spam-Score: 0.0 (/) X-Scan-Signature: d17f825e43c9aed4fd65b7edddddec89 Subject: [PCN] IETF 69 PCN presentations X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org For everyone planning to present at the PCN meeting next week, please send me your slides by Tuesday evening. PDF format is preferred; PPT is acceptable. Regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 19 21:58:38 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBhlO-00035s-Bo; Thu, 19 Jul 2007 21:58:38 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBfSa-0006Up-Rk for pcn-confirm+ok@megatron.ietf.org; Thu, 19 Jul 2007 19:31:04 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBfSZ-0006UW-QF; Thu, 19 Jul 2007 19:31:03 -0400 Received: from smtpout.mac.com ([17.250.248.174]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBfSZ-0008Og-7m; Thu, 19 Jul 2007 19:31:03 -0400 Received: from mac.com (smtpin08-en2 [10.13.10.153]) by smtpout.mac.com (Xserve/smtpout04/MantshX 4.0) with ESMTP id l6JNV2Bf027891; Thu, 19 Jul 2007 16:31:02 -0700 (PDT) Received: from [192.150.186.170] (laptop170.icsi.berkeley.edu [192.150.186.170]) (authenticated bits=0) by mac.com (Xserve/smtpin08/MantshX 4.0) with ESMTP id l6JNUWF6009841; Thu, 19 Jul 2007 16:30:37 -0700 (PDT) In-Reply-To: <5.2.1.1.2.20070617041232.04188110@pop3.jungle.bt.co.uk> References: <5.2.1.1.2.20070617041232.04188110@pop3.jungle.bt.co.uk> Mime-Version: 1.0 (Apple Message framework v624) Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: <3144d54f51c807e534a10759210d5729@mac.com> Content-Transfer-Encoding: 7bit From: Sally Floyd Date: Thu, 19 Jul 2007 16:30:31 -0700 To: Bob Briscoe X-Mailer: Apple Mail (2.624) X-Brightmail-Tracker: AAAAAA== X-Brightmail-scanned: yes X-Spam-Score: 0.0 (/) X-Scan-Signature: 02ec665d00de228c50c93ed6b5e4fc1a X-Mailman-Approved-At: Thu, 19 Jul 2007 21:58:37 -0400 Cc: PCN IETF list , DCCP IETF list , tsvwg IETF list Subject: [PCN] Re: [dccp] Initial I-D: draft-briscoe-tsvwg-byte-pkt-mark-00 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Bob - Some feedback on "Byte and Packet Congestion Notification", draft-briscoe-tsvwg-byte-pkt-mark-00: It seems odd to me to talk about RED in byte vs. packet mode, and not to talk about the similar performance difference between Drop-Tail queues in bytes vs. packets. (Well, someone could care about RED and not Drop-Tail because one cared only about packet marks in an ECN environment, but for this document it strikes me as quite odd to talk about RED in byte vs. packet mode, and not to talk also about Drop-Tail queues in bytes vs. packets.) I am enclosing some text from some 2/26/2007 email that I sent you about this, in response to "draft-briscoe-tsvwg-byte-pkt-mark-00c". (I didn't reread the new draft, but I did look at the diffs between draft-briscoe-tsvwg-byte-pkt-mark-00 and draft-briscoe-tsvwg-byte-pkt-mark-00c, and I didn't notice anything added about Drop-Tail queues in bytes vs. packets.) From my 2/26/2007 email: ---------------------------------------------------------------- "As is discussed at length and illustrated with simulations in [RFC 4828], drop-tail queues also have a wide range of possible behaviors, in terms of dropping packets from a flow proportionally to the sending rate in bits per second, or to the sending rate in packets per second, or something else entirely. For example, the abstract of [RFC 4828] includes the following:" "Flows using TFRC-SP compete reasonably fairly with large-packet TCP and TFRC flows in environments where large-packet flows and small- packet flows experience similar packet drop rates. However, in environments where small-packet flows experience lower packet drop rates than large-packet flows (e.g., with Drop-Tail queues in units of bytes), TFRC-SP can receive considerably more than its share of the bandwidth." "This is discussed more in Section 4.5.1, and in Appendix B.3 of that draft." "My understanding is that buffer architectures in routers can be complex, but one buffer architecture is to have a fixed number of slots for packet headers in the output queue, with the actual data packet stored elsewhere in the router. So in this design, the queue would essentially have a fixed number of slots for packet headers, with each packet taking exactly one packet-header slot, regardless of the packet size in bytes. Functionally, this would be equivalent to a Drop-Tail queue in packets in NS. But there could also be routers whose Drop-Tail queues are more like the Drop-Tail queue in bytes in NS, where small packets are more likely than large packets to find a slot in the queue. So the complications are not only about AQM..." ---------------------------------------------------------------- As an aside, in the future should I forward feedback about this draft to only one of the three mailing lists above? - Sally http://www.icir.org/floyd/ _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 20 05:17:59 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBocZ-0001up-5T; Fri, 20 Jul 2007 05:17:59 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBocX-0001tw-0i for pcn-confirm+ok@megatron.ietf.org; Fri, 20 Jul 2007 05:17:57 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBocS-0001tl-OS for pcn@ietf.org; Fri, 20 Jul 2007 05:17:53 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBocR-0005IC-4n for pcn@ietf.org; Fri, 20 Jul 2007 05:17:52 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 1234C7956; Fri, 20 Jul 2007 11:17:48 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 04784B1D8; Fri, 20 Jul 2007 11:17:48 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id D89BB7956; Fri, 20 Jul 2007 11:17:47 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6K9Hlh19595; Fri, 20 Jul 2007 11:17:47 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 349DD6F58E; Fri, 20 Jul 2007 11:12:02 +0200 (CEST) Message-ID: <46A07CF0.1040902@informatik.uni-wuerzburg.de> Date: Fri, 20 Jul 2007 11:14:24 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Lars Eggert Subject: Re: [PCN] questions after a lot of reading References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 1e467ff145ef391eb7b594ef62b8301f Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, Lars Eggert wrote: > Hi, > > after reading over the set of PCN drafts, I was left with a number of > questions. These aren't detailed comments on the individual documents > but rather higher-level questions about the architecture. I'm posting > them now in order to jumpstart the discussion during the PCN session > next week. > > I apologize that the questions go a bit all over the place. I'm trying > to order them in a way that can be followed. > > > [1] Semantics of the stop-admission signals > > Pre-congested routers piggyback admission markings onto the traffic > flowing through them. The egress that analyzes the volume and dynamics > of these markings and may make a stop-admission decision, which it > then signals to the ingress. Agreement so far? I agree. > > OK, then: What is the semantics of the stop-admission signal? A simple > "stop admitting new flows" seems to require a complementary "start > admitting new flows" signal. Or is it "stop admitting new flows for a > time x", which would not need that second signal? > > The latter seems conceptually simpler and may arguably be a bit more > robust, because the system will un-wedge itself if the > "start-admission signal" gets lost. But this approach might end up > causing fluctuations during periods of pre-congestion that are > significantly longer than x. (Do we expect to support cases where a > domain is in a pre-congested state for prolonged periods of time?) I cannot remember an explicit discussion and consensus about the exact method to signal admission-stop/admission-continue from PCN egress to ingress. I find it interesting to have a soft state at the PCN ingress node for a time during which it must not admit new traffic. This might be useful if an admission-continue signal is lost. As an alternative, TCP needs to be used for admission-stop/admission-continue signalling from PCN egress to ingress. > > (For the "termination" signal going from the egress to the ingress, I > guess the semantics are clear.) Not really. We have at least two different options. 1) Measured rate termination (cl-draft and others) ALL packets exceeding the "supportable/tolerable/termination rate" are "excess-traffic/termination" marked. The PCN egress node measures the rate of marked packets for each ingress-egress aggregate, it potentially applies an EWMA to the measured result, and signals it to the respective ingress which terminates a set of flows with that rate. Therefore, the PCN ingress node should know the rates of individual flows. In combination with multipath routing, the PCN ingress does not know which flows really go over the bottlenecked link and need to be terminated, unless the information about the marked flows is also signaled from PCN egress to ingress. Since all excess-traffic packets are marked, this can be a large amount. As an alternative, the PCN node may choose the flows for termination facing the same challenges. A minimum time between two consecutive termination signals for the same ingress-egress aggregate should be respected because it takes some time until the first termination signal has stopped its flows, the reduced rate is measured and visible in the averaged EWMA result. The required marking mechanism for this approach is covered as a special case in the 3sm draft (slowdown parameter s=0). The single marking approach is slightly different (the excess traffic rate is determined differently), but it works similarly with regard to the signaling aspect once the excess traffic rate is found. However, there is a difference which is important for multipath routing. If a packet is marked, this may come from a path where only the admissible rate is exceeded or from a path where also the tolerable rate is exceeded such that flow termination is required. Thus, in the presence of multipath routing, single marking makes it harder to find out if a particular flow has been carried over a bottlenecked link whose tolerable rate is exceeded (termination of that flow helps to reduce the excess traffic) or just over another path whose admissible rate is exceeded (termination of that flow does not help to reduce the excess traffic). 2) Marked flow termination (3sm draft aka explicit marking) Only SOME packets exceeding the "supportable/tolerable/termination rate" are "excess-traffic/termination" marked. The PCN egress node signals the flow information of each marked packet to the corresponding PCN ingress node which terminates this flow (several flows may be signalled in one message). As this flow was marked, it used the bottlenecked link and is therefore a correct candidate to terminate also in case of multipath routing. No rate measurement is done. No EWMA smoothing is done. The PCN egress node does not need to wait a minimum amount of time between two termination signals. The PCN ingress node does not need to know the rates of the flows. The termination speed of this approach is fast and can be controlled by the slowdown-parameter of the packet marker. > [2] Implications of multi-marking schemes > > I must admit that so far, I have mostly thought of PCN in terms of > something similar to Anna's single-marking proposal. Meaning that the > egress would come to a termination decision (rather than a > stop-admission decision) when the volume or dynamics of the arriving > markings becomes severe. > > (Note: That's not to say that I necessarily believe that > single-marking should be the technical solution the WG should pick; > all I'm saying is that I had so far thought about PCN mostly in this > way.) > > Reading some of the proposals that use multiple kinds of markings made > me realize that I had made some implicit assumptions about how the > termination mechanism might operate that were a cause of thinking in > terms of using a single marking. After reading the multi-marking > proposals, I'm not sure if these assumptions are shared by all of the > group. I'm also not sure if there is an agreement among the different > multi-marking proposals, either. As far as I know, exact marking behaviors using pseudo code are only described in the 3sm draft (it explicitly allows token bucket and virtual queue implementations, it does not exclude other similar implementations, only the behavior is described). I think that there is a rough consensus about the "multi-marking" schemes, at least I am not aware of any written proposal that significantly differs from 3sm. This is logical as 3sm focuses on this aspect while other drafts focus on encoding, signaling, or other aspects. However, I might be wrong and I might have missed something. If so, please correct me and point me to the section in the right document! > > With a multi-marking scheme, when a congested router marks packets > with _termination_ marks, does it matter _which_ packets (and hence > which flows) are marked? Is there an assumption that the system will > terminate those and only those flows? Or is termination marking > similar to admission marking, for which piggybacking them onto the > current traffic stream is simply a convenient transport mechanism? > Meaning that in the latter case, the egress is free to terminate flows > whose packets didn't have congestion markings, and let flows remain > whose packets did, as long as whatever decision it comes to alleviates > the congestion? The individual marked packets are irrelevant for the flow termination result of the "measured rate termination" approach while they exactly determine the flows to be terminated for the "marked flow termination" approach. If the "measured rate termination" wants to cope with multipath routing, it should also terminate a subset of the marked flows. > > > Schemes where the termination decision is influenced by which flows > have received termination marks seem to require per-flow state at the > routers, because they need to be sure that they terminate a sufficient > volume of traffic. That seems to conflict with the goal of the > architecture to limit that such state to the domain boundary, right? I don't see where extra per-flow states need to be kept when the termination decision is influenced by which flows have received the termination marks. Interior PCN nodes just mark packets for "marked flow termination" as for "measured rate termination". No flow states are required inside the PCN domain. In both cases the PCN egress nodes communicate the outcome of the marking (individual flows or excess traffic rate) to the respective flow termination entitiy (wich often is - unnecessarily - assumed to be collocated with the PCN ingress router). Do I miss something? > > > [3] Marking dynamics > > I've seen two ways in the documents that describe how routers should > mark packets: First, a scheme where the frequency at which a router > marks packets is proportional to some level of pre-congestion or > congestion. Second, a scheme where a router starts marking _all_ > packets when congestion exceeds a certain level. > > The first scheme transmits much finer-grained information from the > routers to the egress, which should benefit the decision algorithm > there. The second scheme basically signals a binary condition. I can't > come up with a reason why the second scheme should be the better one - > can anyone explain? "Termination/excess-traffic" marking: only those packets are marked that exceed the "supportable/tolerable/termination" rate. 1) Measured rate termination requires this to determine the rate to be terminated. 2) Marked flow termination uses an additional slowdown parameter to reduce the number of marked flows to avoid overtermination as all marked flows are going to be terminated. Thus, both cases have a strong reason why not all packets should be marked. Single marking and "Admission/admission-stop" marking in case of "multi-marking": 1) The single marking approach proposes to mark only a fraction of the traffic. Otherwise, there is no room to signal excess traffic which is done by just marking more traffic. The exact rate of marked packets needs to be determined fast which is difficult in the presence of bursty or time-varying traffic. 5% error is already a significant difference that may impact the admission decision. Using EWMA with a LONG memory to improve the measurement accuracy delays the recognition of increased traffic rates. I guess that this problem is not visible for periodic traffic. 2) The approach presented in the 3sm draft marks all packets with admission-stop as soon as the admissible rate is exceeded. Either 0% or 100% of the traffic is marked when the rate on the link is clearly below or above the admissible rate. Therefore, 5% error in the measurement process are negligible. The measurement can be done faster. The "all or nothing" approach can be seen as a "strong" signal which can be recognized more easily and therefore faster than an exact rate can be determined. However, further simulations are required to underpin this speculation Regards, Michael > > > Thanks and see you next week, > Lars > ------------------------------------------------------------------------ > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 20 10:39:10 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBtdN-00048F-Um; Fri, 20 Jul 2007 10:39:09 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBtdN-00046S-5d for pcn-confirm+ok@megatron.ietf.org; Fri, 20 Jul 2007 10:39:09 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBtdM-00046K-Qc for pcn@ietf.org; Fri, 20 Jul 2007 10:39:08 -0400 Received: from rotterdam.ewi.utwente.nl ([130.89.10.5]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBtdM-0004PZ-0l for pcn@ietf.org; Fri, 20 Jul 2007 10:39:08 -0400 Received: from utip105 (utip105.ewi.utwente.nl [130.89.13.76]) by rotterdam.ewi.utwente.nl (8.13.6/8.13.6) with ESMTP id l6KEciAh008600; Fri, 20 Jul 2007 16:38:59 +0200 (MEST) From: "Georgios Karagiannis" To: References: <467FA562.2060603@ericsson.com> <75A199C5D243C741BF3D3F1EBCEF9BA5019DC344@E03MVZ1-UKDY.domain1.systemhost.net> <001501c7cada$5c8e2810$4c0d5982@dynamic.ewi.utwente.nl> Subject: RE: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Date: Fri, 20 Jul 2007 16:38:39 +0200 Message-ID: <001601c7cadb$b2a75db0$4c0d5982@dynamic.ewi.utwente.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <001501c7cada$5c8e2810$4c0d5982@dynamic.ewi.utwente.nl> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Thread-Index: Ace3GxtZWDEHRn83T/m3IGeLNeDF2AS8YfSwADNiy3AAACDi8A== X-Spam-Score: 0.21 () FVGT_s_MULTI_OBFU_2,FVGT_u_HAS_2LETTERFLDR X-Scanned-By: MIMEDefang 2.52 on 130.89.10.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0rc3 (rotterdam.ewi.utwente.nl [130.89.10.5]); Fri, 20 Jul 2007 16:39:00 +0200 (MEST) X-Spam-Score: 0.0 (/) X-Scan-Signature: 848ed35f2a4fc0638fa89629cb640f48 Cc: pcn@ietf.org, Lars.westberg@ericsson.com X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil Thank you very much for reading the draft! Please see comments in line! > > ________________________________ > > From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] > Sent: donderdag 19 juli 2007 16:22 > To: Lars.westberg@ericsson.com; pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > > > > Lars > > > > I started reading your draft, but have a couple of > clarification questions about what you're proposing. > > > > As I understand it:- > > * there are two marking algorithms on the interior routers Georgios: Yes you are right! > > * Admission-marking: if the rate exceeds threshold-1, > then all pkts are Adm marked Georgios: Note that here the "encoded DSCP" marking is used. Thus also in this state the excess-traffic rate is measured and a fraction (1/N) of the excess rate is Termination (encoded) marked. However, another type of marking could also be used, which is not explicitly described in this document, but is somehow projected in the draft as "notified DSCP" . Sorry for this! We will clarify this operation in a next version of the draft. For the time being assume that the "encoded DSCP" marking is used for both admission control and flow termination features. If this is applied then: For both cases the excess-traffic rate is measured and a fraction (1/N) of the excess rate is Termination (encoded) marked. > > * Termination-marking: if the rate exceeds threshold-2, > the excess-traffic rate is measured and a fraction (1/N) of > the excess rate is Termination marked. Georgios: agree! > > > The adm marking algo is a bit unclear to me, sometimes > it's described as marking all pkts as soon as threshold-1 is > exceeded - sometimes (eg S4.1.3) it seems that a fraction of > the excess traffic is marked (same idea as above under " * > Termination marked"). Which is correct? Georgios: You are right that the text is unclear. When the "encoded DSCP" marking is used for admission control, then the excess-traffic rate is measured and a fraction (1/N) of the excess rate is Termination (encoded) marked. We will clarify this in the next version of the draft! > > > > I'm also not sure what "encoded DSCP" and "notified > DSCP" mean. Do they correspond to Admission-marking and > Termination-marking, or do they mean something else? Georgios: the "notified DSCP" is just projected somewhere in the text, and that is not correct. This marking is related to the scenario that an additional DSCP is needed for the admission control feature, which is vaguely described in the draft. For the time being assume that the "encoded DSCP" marking is used for both admission control and flow termination features. We will clarify this in the next version of the draft. > > > A point that doesn't just apply to this draft: > > > http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-pk > t-mark-00.txt > which looks at "whether to allow for packet size when the > network codes or when the transport decodes congestion > notification." This draft argues that, when marking, the > packet size should not be taken into account. Georgios: Thank you for the pointer I will read the draft and discuss it during the Chicago IETF meeting! Best regards and see you in Chicago! Georgios > > Thanks > phil > > > > -----Original Message----- > From: Lars Westberg [mailto:Lars.westberg@ericsson.com] > Sent: 25 June 2007 12:22 > To: pcn@ietf.org > Subject: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > > > > Dear all > > The "LC-PCN - The Load Control PCN solution" draft can > be found via: > > http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-co > ntrol-00.txt > > > Abstract > > There is an increased interest of simple and scalable > resource provisioning > solution for Diffserv network. > The Load Control PCN (LC-PCN) addresses the following issues: > > 1. Admission control for real time data flows in > stateless Diffserv Domains > 2. Flow termination: Termination of flows in case of > exceptional events, > such as severe congestion after re-routing. > Admission control in a Diffserv stateless domain is a > combination > of: > > 1. Probing, whereby a probe packet is > sent along the forwarding path in a network to determine > whether a flow can be admitted based upon the current > congestion state of the network > > 2. Admission control based on data marking, whereby > in congestion > situations the data packets are marked to notify > the egress node > that a congestion occurred on a particular ingress to egress > path. > The scheme provides the capability of controlling > the traffic load in > the network without requiring signaling or any > per-flow processing in > the core routers. The complexity of Load Control is > kept to a minimum > to make implementation simple. > > Kind regards, > > Lars > > > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 20 11:40:34 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBuao-0003lQ-3Z; Fri, 20 Jul 2007 11:40:34 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBuam-0003lL-TG for pcn-confirm+ok@megatron.ietf.org; Fri, 20 Jul 2007 11:40:32 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBuam-0003lC-Hn for pcn@ietf.org; Fri, 20 Jul 2007 11:40:32 -0400 Received: from rotterdam.ewi.utwente.nl ([130.89.10.5]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBual-0005og-J5 for pcn@ietf.org; Fri, 20 Jul 2007 11:40:32 -0400 Received: from utip105 (utip105.ewi.utwente.nl [130.89.13.76]) by rotterdam.ewi.utwente.nl (8.13.6/8.13.6) with ESMTP id l6KFeGT6019923; Fri, 20 Jul 2007 17:40:29 +0200 (MEST) From: "Georgios Karagiannis" To: References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC344@E03MVZ1-UKDY.domain1.systemhost.net> <75A199C5D243C741BF3D3F1EBCEF9BA5019DC347@E03MVZ1-UKDY.domain1.systemhost.net> <001f01c7cadc$5edd0f30$4c0d5982@dynamic.ewi.utwente.nl> Subject: RE: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Date: Fri, 20 Jul 2007 17:40:11 +0200 Message-ID: <002101c7cae4$4a4ef030$4c0d5982@dynamic.ewi.utwente.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <001f01c7cadc$5edd0f30$4c0d5982@dynamic.ewi.utwente.nl> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Thread-Index: Ace3GxtZWDEHRn83T/m3IGeLNeDF2AS8YfSwAANKUAAAMKHJwAAAE4FQ X-Spam-Score: 0.21 () FVGT_s_MULTI_OBFU_2,FVGT_u_HAS_2LETTERFLDR X-Scanned-By: MIMEDefang 2.52 on 130.89.10.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0rc3 (rotterdam.ewi.utwente.nl [130.89.10.5]); Fri, 20 Jul 2007 17:40:30 +0200 (MEST) X-Spam-Score: 0.0 (/) X-Scan-Signature: f2728948111f2edaaf8980b5b9de55af Cc: Lars.westberg@ericsson.com, pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil, Michael, Joe I have read the 3sm draft, see below, and quicly compared it with the LC-PCN draft. http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt >From a quick comparison I could derive is the following: * Both algorithms can provide admission control, flow termination and ECMP handling during admission control and flow termination. * Both algoriuthms use excess rate measurements at the interior. The semantics are the same, but the implementation type is different, token bucket versus bandwidth measurements. * Both algorithms use probing during the admission control process and the egress rejects a request when they are in "admission-stop" (or "congestion notification" state. The LC-PCN can support two encoding modes/states: * One encoding mode/state for admission control and flow termination In the current version only this option is described in detail. The marking and metering used For admission control in 3SM and LC-PCN are different. Note that the 3SM does not use the reduction factor "s" In case of admission control, while in LC-PC, when the "encoded DSCP" marking is used, then the relation factor between metering and marking (N) is used. * Two encoding mode/state: one for admission control and one for flow termination (in this case the "notified DSCP"" is used for admission control and the "encoded DSCP" Is used for flow termination. Note that in this option the factor N is not used for admission control in LC-PCN. In this case the metering and marking Schemes used in LC-PCN and 3SM are semantically very similar. * For flow termination, when only one value of the "s" parameter is used in whole PCN domain (in LC-PCN one N value should be used in whole domain) then the metering and marking algorithms in 3SM and LC-PCN are from a semantic point of view the same. The mechanisms at the edges are somehow different. In 3SM all flows that are marked are selected for termination, while in LC-PCN flows the excess rate is measured and according to this rate (corrected by using the value of N) a number of flows that are "affected marked" and "encoded marked" are selected for termination. Note that the LC-PCN algorithm at the egress takes into account the priority of flows. However, the LC-PCN algorithm also works when no priority differentiation between flows is used. Best regards, Georgios I think that semantically the metering and marking mechanism are similar. hen the parameter "s" is set to be equal in whole PCN domain > -----Original Message----- > From: Georgios Karagiannis [mailto:karagian@cs.utwente.nl] > Sent: vrijdag 20 juli 2007 16:44 > To: 'Georgios Karagiannis' > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > > > > > ________________________________ > > From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] > Sent: donderdag 19 juli 2007 18:01 > To: Lars.westberg@ericsson.com; pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > > > > Lars > > > > I have just been reading > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.t > xt. it seems a very similar proposal? So one way it might be > useful to clarify your proposal is to compare it with the > babiarz proposal. > > > > Could you clarify how it differs: > > * in the 2 algorithms at the PCN-interior-nodes, ie for > admission-marking & termination-marking > * in the encoding used for for admission-marking & > termination-marking (I think it's simply that draft-babiarz > doesn't define encodings (ECN field mentioned in passing), > whereas draft-westberg says use new dscps). > * in the reaction at the PCN-boundary-nodes > > > > thanks, > > phil > > -----Original Message----- > From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] > Sent: 19 July 2007 15:22 > To: Lars.westberg@ericsson.com; pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > > > > Lars > > > > I started reading your draft, but have a couple of > clarification questions about what you're proposing. > > > > As I understand it:- > > * there are two marking algorithms on the interior routers > > * Admission-marking: if the rate exceeds threshold-1, > then all pkts are Adm marked > > * Termination-marking: if the rate exceeds threshold-2, > the excess-traffic rate is measured and a fraction (1/N) of > the excess rate is Termination marked. > > > > The adm marking algo is a bit unclear to me, sometimes > it's described as marking all pkts as soon as threshold-1 is > exceeded - sometimes (eg S4.1.3) it seems that a fraction of > the excess traffic is marked (same idea as above under " * > Termination marked"). Which is correct? > > > > I'm also not sure what "encoded DSCP" and "notified > DSCP" mean. Do they correspond to Admission-marking and > Termination-marking, or do they mean something else? > > > > A point that doesn't just apply to this draft: > > > http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-pk > t-mark-00.txt > which looks at "whether to allow for packet size when the > network codes or when the transport decodes congestion > notification." This draft argues that, when marking, the > packet size should not be taken into account. > > Thanks > phil > > > > -----Original Message----- > From: Lars Westberg [mailto:Lars.westberg@ericsson.com] > Sent: 25 June 2007 12:22 > To: pcn@ietf.org > Subject: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > > > > Dear all > > The "LC-PCN - The Load Control PCN solution" draft can > be found via: > > http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-co > ntrol-00.txt > > > Abstract > > There is an increased interest of simple and scalable > resource provisioning > solution for Diffserv network. > The Load Control PCN (LC-PCN) addresses the following issues: > > 1. Admission control for real time data flows in > stateless Diffserv Domains > 2. Flow termination: Termination of flows in case of > exceptional events, > such as severe congestion after re-routing. > Admission control in a Diffserv stateless domain is a > combination > of: > > 1. Probing, whereby a probe packet is > sent along the forwarding path in a network to determine > whether a flow can be admitted based upon the current > congestion state of the network > > 2. Admission control based on data marking, whereby > in congestion > situations the data packets are marked to notify > the egress node > that a congestion occurred on a particular ingress to egress > path. > The scheme provides the capability of controlling > the traffic load in > the network without requiring signaling or any > per-flow processing in > the core routers. The complexity of Load Control is > kept to a minimum > to make implementation simple. > > Kind regards, > > Lars > > > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 20 11:57:25 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBur7-0007fC-N4; Fri, 20 Jul 2007 11:57:25 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBur6-0007f6-4p for pcn-confirm+ok@megatron.ietf.org; Fri, 20 Jul 2007 11:57:24 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBur5-0007ey-Pi for pcn@ietf.org; Fri, 20 Jul 2007 11:57:23 -0400 Received: from rotterdam.ewi.utwente.nl ([130.89.10.5]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IBur4-0006A5-QD for pcn@ietf.org; Fri, 20 Jul 2007 11:57:23 -0400 Received: from utip105 (utip105.ewi.utwente.nl [130.89.13.76]) by rotterdam.ewi.utwente.nl (8.13.6/8.13.6) with ESMTP id l6KFvFxJ023658; Fri, 20 Jul 2007 17:57:21 +0200 (MEST) From: "Georgios Karagiannis" To: , "'Geib, Ruediger'" References: <6439282641581441A36F7F6F83ED2ED201DB9967@S4DE8PSAAFQ.mitte.t-com.de> <46973EA3.2080503@informatik.uni-wuerzburg.de> Subject: RE: FW: [PCN] Probing in the presence of hash-based load balancing Date: Fri, 20 Jul 2007 17:57:10 +0200 Message-ID: <002801c7cae6$a4cf0cf0$4c0d5982@dynamic.ewi.utwente.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <46973EA3.2080503@informatik.uni-wuerzburg.de> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Thread-Index: AcfFLIvqvNwRCUJPRnu6d+nFch3KwAFueKng X-Spam-Score: 1.2 (*) J_CHICKENPOX_12,J_CHICKENPOX_14 X-Scanned-By: MIMEDefang 2.52 on 130.89.10.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0rc3 (rotterdam.ewi.utwente.nl [130.89.10.5]); Fri, 20 Jul 2007 17:57:22 +0200 (MEST) X-Spam-Score: 0.0 (/) X-Scan-Signature: a069a8e8835d39ce36e425c148267a7b Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi all Regarding the below issue! > I don't think we want two different probing > mechanisms, one which is ECMP-capable and another one with is > not. Therefore, I would prefer to keep this goal in mind from > the beginning of the design process. I agree with Michael! Best regards, Georgios > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] > Sent: vrijdag 13 juli 2007 10:58 > To: Geib, Ruediger > Cc: pcn@ietf.org > Subject: Re: FW: [PCN] Probing in the presence of hash-based > load balancing > > Hi, > > I think designing a probing mechanism in such a way that it > copes with ECMP is not too hard when we do that from scratch, > but once we have defined just some mechanism which is not > capable to do that, it will be very hard to extend it for > that purpose. I don't think we want two different probing > mechanisms, one which is ECMP-capable and another one with is > not. Therefore, I would prefer to keep this goal in mind from > the beginning of the design process. > > Regards, > > Michael > > Geib, Ruediger wrote: > > Hi, > > > > some comments in line, marked [Rudi]. > > > > > >> First, we shouldn't set harder requirements for probing > than in the > >> case where there is no probing. > >> Ie our assumption to date has been that probing is needed when > >> there's not enough recent traffic between the specific > >> PCN-ingress-node & PCN-egress-node (that the new flow would flow > >> between), in order that we can make an accurate measurement-based > >> admission decision. Note this is traffic between the > ingress & egress > >> - it isn't "on the specific ECMP path that the new flow > would flow along". > >> > > > > [Joe]My assumption is that probing is needed under the following > > conditions: > > a)when there is no traffic between ingress-egress nodes for that > > aggregate, > > b)when there may be ECMP or other methods that may provide multiple > > paths between ingress-egress nodes, > > c)if there is a need to verify that real-time media packets once > > admitted can infect reach the egress node. > > > > [Rudi] Probing is only required if any border node of a PCN domain > > provides pre-congestion feedback. If that's the case, a) is > required. > > b) assumes ECMP "aware" probing. Phil mentioned > ingress-egress above. > > So Phil's thinking about some basic functionality while > Joe's having a > > more advanced solution in mind (which is desireable, but harder to > > realise). > > c) to me is not an aim, it is more something we can do it > we realise > > a) and b). > > > > > >> Some options: > >> - we could say the adm decision is made on basis of > measured traffic > >> between the specific PCN-ingress-node & PCN-egress-node > >> - we could say the adm decision is made on basis of > measured traffic > >> along the specific ECMP path > >> - we could leave this question open for the operator to > decide (the > >> first is a MUST, the second is a MAY?) > >> > > > > [Joe]I think we better say that adm decision is made on basis of a > > specific path. > > > > [Rudi]We can standardise an overly conservative solution if > we agree > > on MUST for the first. It is up to a provider to improve > the efficency > > of his operations and to ensure proper functionality of PCN. The > > standard must insist on proper functionality and should > provide tools > > to improve efficiency. Looking at it from that angle, Phil's > > suggestion on MUST for the first and MAY for the second is allright. > > > > > >> Lastly, re your point 4 below. This is a good question. I > believe the > >> answer isn't the same for all vendors. > >> One specific question [slightly off topic of your email, > as related > >> to ecmp rather than probing specifically]: are the DS field & ECN > >> field considered by the ecmp hash algos? If yes, that > could mean that > >> a pkt would travel a different ecmp path after it gets PCN-marked > >> compared to if it stays unmarked; I'm not sure if this has > any nasty > >> implications for us, but we ought to think about it? > >> > > > > [Joe]ECMP hash algorithms may use some or all of, > source/destination > > IP address, source/destination port numbers, protocol ID > and DSCP field. > > ECN field should not be used in hash algorithms. > > > > Michael Menth wrote on 10 July 2007 07:36 > > > >> 2) PCN-based AC is a border-to-border solution. Therefore, > >> PCN-related signaling packets should not leave the network > although > >> equipped with "wrong" source and destination addresses. Is > that true? > >> If not, why not? > >> > > > > [Joe]True. I believe that egress node would need to block from > > forwarding to next node probe packets in a border-to-border > scenario. > > > > [Rudi] Agree to Joe and Michael. > > > > > >> 3) A standardized mechanism is required to encode probe > packets that > >> PCN egress routers can recognize and intercept them, and to signal > >> appropriate feedback to the corresponding AC entities. > >> > > > > [Joe]This is highly desirable. We need to define a probing > method that > > works with ECMP and egress router can easily detect probe packets. > > > > [Rudi] Yes, that's desireable. > > > > > >> 4) I don't know the exact header fields used for the > hash-based load > >> balancing. These fields should be the same for normal data packets > >> and probe packets to make sure that they all take the same path. > >> Which fields are typically used for that purpose? Those that are > >> typically not used might be changed to indicate that PCN > packets are > >> used for probing. > >> > > > > [Joe] I believe ECN field in IP header could be used to signal to > > egress router that this packet needs further inspection. > Upon further > > inspection the egress router determines that it is a probe packet. > > > > [Rudi] By that you define a "selective RAO", meaning that > egress nodes > > must interpret some IP header "codepoint" as RAO. The cool part of > > your idea is that only some routers interpret this > "codepoint" as RAO, > > not all. Security demands to limit this option to a single > domain of trust. > > So an egress node must act differently on a packet received > with that > > codepoint, depending on the interface, where it is received (from > > within PCN domain or from a PCN external interface). > > I like the idea. If more people provide support, we may > contact the WG > > chairs to see how our chances are to get that standardised within > > IETF. I'm not sure, whether this is "just a PCN decision". > > Working on this proposal should however not delay work on > the easier > > to realise "ingress-egress" probing functionality. > > > > Regards, > > > > Ruediger > > > > > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn > > > > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science Am > Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 20 13:35:29 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBwO1-0004tc-3a; Fri, 20 Jul 2007 13:35:29 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBwNz-0004pk-Oz for pcn-confirm+ok@megatron.ietf.org; Fri, 20 Jul 2007 13:35:27 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBwNz-0004ox-7s for pcn@ietf.org; Fri, 20 Jul 2007 13:35:27 -0400 Received: from rtp-iport-1.cisco.com ([64.102.122.148]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBwNx-0003k6-U0 for pcn@ietf.org; Fri, 20 Jul 2007 13:35:27 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-1.cisco.com with ESMTP; 20 Jul 2007 13:35:25 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAKuOoEZAZnme/2dsb2JhbAA X-IronPort-AV: i="4.16,563,1175486400"; d="scan'208"; a="65728321:sNHT45871704" Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6KHZP9Y010067; Fri, 20 Jul 2007 13:35:25 -0400 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6KHZ8WW021034; Fri, 20 Jul 2007 17:35:24 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 20 Jul 2007 13:35:15 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] questions after a lot of reading Date: Fri, 20 Jul 2007 13:35:14 -0400 Message-ID: In-Reply-To: <46A07CF0.1040902@informatik.uni-wuerzburg.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] questions after a lot of reading Thread-Index: AcfKruZkngF3noU6Q/meWZqZ8j+8zAAPD0KA From: "Anna Charny \(acharny\)" To: , "Lars Eggert" X-OriginalArrivalTime: 20 Jul 2007 17:35:15.0592 (UTC) FILETIME=[5556A080:01C7CAF4] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=18564; t=1184952925; x=1185816925; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20RE=3A=20[PCN]=20questions=20after=20a=20lot=20of=20reading |Sender:=20 |To:=20, =20=22Lars=20Eggert=22=20; bh=BE7FnyrXOF2sg2GtPB5rqnWD17WheDEd38rYxCHuVcg=; b=ez+c3TTNRKUa2wbhb9ZbRJ9AZyt4UTOA+gzSrNDZBWnNYT115vWcSv9uEX9SqvgdyaPoxuJK ecRgISj/EXPSmCVgwBRAn/169pLt1bzDlyBH3WC9Vp8uut/qkcHFukYy; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: 563af5038a5e1dade28c8affc0fff375 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Lars, Michael,=20 Please see a bit more below: > -----Original Message----- > From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de]=20 > Sent: Friday, July 20, 2007 5:14 AM > To: Lars Eggert > Cc: pcn@ietf.org > Subject: Re: [PCN] questions after a lot of reading >=20 > Hi, >=20 > Lars Eggert wrote: > > Hi, > > > > after reading over the set of PCN drafts, I was left with a=20 > number of=20 > > questions. These aren't detailed comments on the individual=20 > documents=20 > > but rather higher-level questions about the architecture.=20 > I'm posting=20 > > them now in order to jumpstart the discussion during the=20 > PCN session=20 > > next week. > > > > I apologize that the questions go a bit all over the place.=20 > I'm trying=20 > > to order them in a way that can be followed. > > > > > > [1] Semantics of the stop-admission signals > > > > Pre-congested routers piggyback admission markings onto the traffic=20 > > flowing through them. The egress that analyzes the volume=20 > and dynamics=20 > > of these markings and may make a stop-admission decision, which it=20 > > then signals to the ingress. Agreement so far? >=20 > I agree. >=20 > > > > OK, then: What is the semantics of the stop-admission=20 > signal? A simple=20 > > "stop admitting new flows" seems to require a complementary "start=20 > > admitting new flows" signal. Or is it "stop admitting new=20 > flows for a=20 > > time x", which would not need that second signal? > > > > The latter seems conceptually simpler and may arguably be a=20 > bit more=20 > > robust, because the system will un-wedge itself if the=20 > > "start-admission signal" gets lost. But this approach might end up=20 > > causing fluctuations during periods of pre-congestion that are=20 > > significantly longer than x. (Do we expect to support cases where a=20 > > domain is in a pre-congested state for prolonged periods of time?) >=20 > I cannot remember an explicit discussion and consensus about=20 > the exact method to signal admission-stop/admission-continue=20 > from PCN egress to ingress. I find it interesting to have a=20 > soft state at the PCN ingress node for a time during which it=20 > must not admit new traffic. This might be useful if an=20 > admission-continue signal is lost. As an alternative, TCP=20 > needs to be used for admission-stop/admission-continue=20 > signalling from PCN egress to ingress. >=20 The current architecture work in the wg has not really addressed this issue yet. Different algs drafts however did take different approaches. For example, the initial CL-phb work assumes that the CLE measurement is continuously/peridically sent to the ingress, which admits as long as the CLE is below a specified threshold, and does not admit when the threshold is reached. Single marking does the same. 3sm draft marlking stops admission on receipt of a single admisison market packet and resumes after a timeout. Not yet completely sure what draft-westberg does about it (still to digest the draft in detail). It seems that the architecture should allow both explicit periodic CLE updates, and a timeout should the CLE feedback is lost. I would argue that timeout should probably be used as more of an exception measure than the main mechanism, but the jury is still out. > > (For the "termination" signal going from the egress to the=20 > ingress, I=20 > > guess the semantics are clear.) >=20 > Not really. We have at least two different options. >=20 > 1) Measured rate termination (cl-draft and others) ALL=20 > packets exceeding the "supportable/tolerable/termination=20 > rate" are "excess-traffic/termination" marked. The PCN egress=20 > node measures the rate of marked packets for each=20 > ingress-egress aggregate, it potentially applies an EWMA to=20 > the measured result, and signals it to the respective ingress=20 > which terminates a set of flows with that rate. Therefore,=20 > the PCN ingress node should know the rates of individual=20 > flows.=20 Ideally it would be good if termintation mechanism is directly aware of the rates of flows it terminates. However, in practice it may suffice just use the number of flows as an indicator of how many flows to remove. >In combination with multipath routing, the PCN ingress=20 > does not know which flows really go over the bottlenecked=20 > link and need to be terminated, unless the information about=20 > the marked flows is also signaled from PCN egress to ingress.=20 > Since all excess-traffic packets are marked, this can be a=20 > large amount. As an alternative, the PCN node may choose the=20 > flows for termination facing the same challenges. A minimum=20 > time between two consecutive termination signals for the same=20 > ingress-egress aggregate should be respected because it takes=20 > some time until the first termination signal has stopped its=20 > flows, the reduced rate is measured and visible in the=20 > averaged EWMA result. The required marking mechanism for this=20 > approach is covered as a special case in the 3sm draft=20 > (slowdown parameter s=3D0). >=20 > The single marking approach is slightly different (the excess=20 > traffic rate is determined differently), but it works=20 > similarly with regard to the signaling aspect once the excess=20 > traffic rate is found. However, there is a difference which=20 > is important for multipath routing. If a packet is marked,=20 > this may come from a path where only the admissible rate is=20 > exceeded or from a path where also the tolerable rate is=20 > exceeded such that flow termination is required. Thus, in the=20 > presence of multipath routing, single marking makes it harder=20 > to find out if a particular flow has been carried over a=20 > bottlenecked link whose tolerable rate is exceeded=20 > (termination of that flow helps to reduce the excess traffic)=20 > or just over another path whose admissible rate is exceeded=20 > (termination of that flow does not help to reduce the excess traffic). >=20 Indeed. This is the price for not using extra marking codepoint and measurement in the core. Single marking will have to endure some error in which flows are terminated in the mulipath case. Of course the moment you add back another measurement and another codepoint, the ability to deal with multipath then comes back, and the many options of doing so are described by Michael above. >=20 > 2) Marked flow termination (3sm draft aka explicit marking)=20 > Only SOME packets exceeding the=20 > "supportable/tolerable/termination rate"=20 > are "excess-traffic/termination" marked. The PCN egress node=20 > signals the flow information of each marked packet to the=20 > corresponding PCN ingress node which terminates this flow=20 > (several flows may be signalled in one message). As this flow=20 > was marked, it used the bottlenecked link and is therefore a=20 > correct candidate to terminate also in case of multipath=20 > routing. No rate measurement is done. No EWMA smoothing is=20 > done. The PCN egress node does not need to wait a minimum=20 > amount of time between two termination signals. The PCN=20 > ingress node does not need to know the rates of the flows.=20 It is correct that the ingress does not need to know the rates in this case, but the other side of this coin is that removing a high-rate flow may be an overkill if the amount of traffic that needs to be remoived is samll. So in either case lack of knowledge about the rates may lead to inaccurate termination decisions with respect to rates. > The termination speed of this approach is fast and can be=20 > controlled by the slowdown-parameter of the packet marker. It seems that how fast it really is still needs to be understood. The speed of termination in the 3sm approach is controlled with the slowdown parameter, while the EWMA parameters control the seed of reaction of the other approaches. I think quantification of these things still remains to be done carefully. >=20 >=20 > > [2] Implications of multi-marking schemes > > > > I must admit that so far, I have mostly thought of PCN in terms of=20 > > something similar to Anna's single-marking proposal.=20 > Meaning that the=20 > > egress would come to a termination decision (rather than a=20 > > stop-admission decision) when the volume or dynamics of the=20 > arriving=20 > > markings becomes severe. > > > > (Note: That's not to say that I necessarily believe that=20 > > single-marking should be the technical solution the WG should pick;=20 > > all I'm saying is that I had so far thought about PCN mostly in this > > way.) > > > > Reading some of the proposals that use multiple kinds of=20 > markings made=20 > > me realize that I had made some implicit assumptions about how the=20 > > termination mechanism might operate that were a cause of=20 > thinking in=20 > > terms of using a single marking. After reading the multi-marking=20 > > proposals, I'm not sure if these assumptions are shared by=20 > all of the=20 > > group. I'm also not sure if there is an agreement among the=20 > different=20 > > multi-marking proposals, either. >=20 > As far as I know, exact marking behaviors using pseudo code=20 > are only described in the 3sm draft (it explicitly allows=20 > token bucket and virtual queue implementations, it does not=20 > exclude other similar implementations, only the behavior is=20 > described). I think that there is a rough consensus about the=20 > "multi-marking" schemes, at least I am not aware of any=20 > written proposal that significantly differs from 3sm.=20 > This is=20 > logical as 3sm focuses on this aspect while other drafts=20 > focus on encoding, signaling, or other aspects. However, I=20 > might be wrong and I might have missed something. If so,=20 > please correct me and point me to the section in the right document! >=20 Here I am a bit confused by Micael's statement - so perhaps I will try to say it differently. I believe that across all proposals, 5 separate marking approaches have been described in both admission and termination contexts, and different drafts use different approaches for different purposes (There may be more described in draft-westberg - but again I am yet to fully understand it) 1) "ramp" virtual-queue (two thresholds, mark all packets above the high threshold, mark packets with specified probability between thresholds, do not mark below the lower threshold - used for admission in cl-phb =20 2) "step" virtual queue (only one threshold, mark packets above it, do not mark packets below it =20 - used as an option for admission in cl-phb draft - is equivalent to token-bucket-based implementation of admission marking in 3sm draft=20 =20 3) excess rate-based virtual marking=20 - all packets whose measured rate exceeds the configured termination rate are marked -> can be implemented by standard token bucket - used for termination in cl-phb and single-marking - used for admission in single-marking 4) excess rate marking with slow-down - used in 3sm=20 - marks a subset of packets exceeding the rate=20 - can be implemented by adding the slow-down function to token bucket, as done in CL 5) excess-rate-proportional marking - I believe this is the "encoded" marking in draft-westberg, used for termination - marks a fraction of all packets, where the fraction encodes the amount of overload (but not equal to the amount of overload) (here I hope the authors of draft-westberg will jump in with explanations or crrections of the details) =20 =20 > > > > With a multi-marking scheme, when a congested router marks packets=20 > > with _termination_ marks, does it matter _which_ packets (and hence=20 > > which flows) are marked? Is there an assumption that the=20 > system will=20 > > terminate those and only those flows? Or is termination marking=20 > > similar to admission marking, for which piggybacking them onto the=20 > > current traffic stream is simply a convenient transport mechanism? > > Meaning that in the latter case, the egress is free to=20 > terminate flows=20 > > whose packets didn't have congestion markings, and let flows remain=20 > > whose packets did, as long as whatever decision it comes to=20 > alleviates=20 > > the congestion? >=20 > The individual marked packets are irrelevant for the flow=20 > termination result of the "measured rate termination"=20 > approach while they exactly determine the flows to be=20 > terminated for the "marked flow termination"=20 > approach. If the "measured rate termination" wants to cope=20 > with multipath routing, it should also terminate a subset of=20 > the marked flows. Yes. Said in other words, it matters for some proposals and does not matter for others. >=20 > > > > > > Schemes where the termination decision is influenced by which flows=20 > > have received termination marks seem to require per-flow=20 > state at the=20 > > routers, because they need to be sure that they terminate a=20 > sufficient=20 > > volume of traffic. That seems to conflict with the goal of the=20 > > architecture to limit that such state to the domain boundary, right? >=20 > I don't see where extra per-flow states need to be kept when=20 > the termination decision is influenced by which flows have=20 > received the termination marks. Interior PCN nodes just mark=20 > packets for "marked flow termination" as for "measured rate=20 > termination". No flow states are required inside the PCN=20 > domain. In both cases the PCN egress nodes communicate the=20 > outcome of the marking (individual flows or excess traffic=20 > rate) to the respective flow termination entitiy (wich often is > - unnecessarily - assumed to be collocated with the PCN=20 > ingress router).=20 > Do I miss something? Also not sure why Lars thinks per-flow state is needed? >=20 > > > > > > [3] Marking dynamics > > > > I've seen two ways in the documents that describe how=20 > routers should=20 > > mark packets: First, a scheme where the frequency at which a router=20 > > marks packets is proportional to some level of pre-congestion or=20 > > congestion. Second, a scheme where a router starts marking _all_=20 > > packets when congestion exceeds a certain level. > > > > The first scheme transmits much finer-grained information from the=20 > > routers to the egress, which should benefit the decision algorithm=20 > > there. The second scheme basically signals a binary=20 > condition. I can't=20 > > come up with a reason why the second scheme should be the=20 > better one -=20 > > can anyone explain? >=20 > "Termination/excess-traffic" marking: only those packets are=20 > marked that exceed the "supportable/tolerable/termination" rate. > 1) Measured rate termination requires this to determine the=20 > rate to be terminated. Actually, in cl-phb and single marking, it is the amount of *termination- *un*marked packets that determines the desired rate, and then the excess over this rate is terminated at the ingress. This is different than terminating the amount of marked packets if there is any loss in the system. Also, makes some of the problems associated with timing of removal somehat easier). > 2) Marked flow termination uses an additional slowdown=20 > parameter to reduce the number of marked flows to avoid=20 > overtermination as all marked flows are going to be terminated. > Thus, both cases have a strong reason why not all packets=20 > should be marked. >=20 > Single marking and "Admission/admission-stop" marking in case of > "multi-marking": > 1) The single marking approach proposes to mark only a=20 > fraction of the traffic. Otherwise, there is no room to=20 > signal excess traffic which is done by just marking more traffic. > The exact rate of marked packets needs to be determined fast=20 > which is difficult in the presence of bursty or time-varying=20 > traffic. 5% error is already a significant difference that=20 > may impact the admission decision.=20 > Using EWMA with a LONG memory to improve the measurement=20 > accuracy delays the recognition of increased traffic rates. I=20 > guess that this problem is not visible for periodic traffic. >=20 Single-marking simulation draft actually provides some insight on the issue of sensitivity to parameters. As it is not directly related to Lars's question, will not discuss it here, though. > 2) The approach presented in the 3sm draft marks all packets=20 > with admission-stop as soon as the admissible rate is exceeded. > Either 0% or 100% of the traffic is marked when the rate on=20 > the link is clearly below or above the admissible rate.=20 > Therefore, 5% error in the measurement process are=20 > negligible. The measurement can be done faster.=20 > The "all or nothing" approach can be seen as a "strong"=20 > signal which can be recognized more easily and therefore=20 > faster than an exact rate can be determined. >=20 > However, further simulations are required to underpin this speculation >=20 Indeed. A sensitivity study to the timeout parameter value is needed. The other side of the coin of "strong" signal is that for traffic that is not very smooth reacting to a single mark to stop admission may result in substantial underadmission. Michael is quite right that additional study is required to quantify that. Also a subject of a separate discussion, I think.=20 Best, Anna=20 > Regards, >=20 > Michael >=20 > > > > > > Thanks and see you next week, > > Lars > >=20 > ---------------------------------------------------------------------- > > -- > > > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn > > =20 >=20 > -- > Dr. Michael Menth, Assistant Professor > University of Wuerzburg, Institute of Computer Science Am=20 > Hubland, D-97074 Wuerzburg, Germany, room B206 > phone: (+49)-931/888-6644, fax: (+49)-931/888-6632=20 > mailto:menth@informatik.uni-wuerzburg.de > http://www3.informatik.uni-wuerzburg.de/research/ngn >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn >=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 20 15:04:30 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBxm9-0001ZX-Ve; Fri, 20 Jul 2007 15:04:30 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IBxm7-0001Wt-68 for pcn-confirm+ok@megatron.ietf.org; Fri, 20 Jul 2007 15:04:27 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IBxm6-0001WN-Kl for pcn@ietf.org; Fri, 20 Jul 2007 15:04:26 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IBxm4-0005iy-GJ for pcn@ietf.org; Fri, 20 Jul 2007 15:04:26 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 9E6966FAA; Fri, 20 Jul 2007 21:04:21 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 9073CADE1; Fri, 20 Jul 2007 21:04:21 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 6326F6FAA; Fri, 20 Jul 2007 21:04:21 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6KJ4Kh26898; Fri, 20 Jul 2007 21:04:21 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id EA7886F58E; Fri, 20 Jul 2007 20:58:32 +0200 (CEST) Message-ID: <46A10667.5000201@informatik.uni-wuerzburg.de> Date: Fri, 20 Jul 2007 21:00:55 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: "Anna Charny (acharny)" Subject: Re: [PCN] questions after a lot of reading References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: a2c4a3535d1556ada67f8703d3d31591 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, Anna Charny (acharny) wrote: > Hi Lars, Michael, > > Please see a bit more below: > > >> -----Original Message----- >> From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de] >> Sent: Friday, July 20, 2007 5:14 AM >> To: Lars Eggert >> Cc: pcn@ietf.org >> Subject: Re: [PCN] questions after a lot of reading >> >> Hi, >> >> Lars Eggert wrote: >> >>> Hi, >>> >>> after reading over the set of PCN drafts, I was left with a >>> >> number of >> >>> questions. These aren't detailed comments on the individual >>> >> documents >> >>> but rather higher-level questions about the architecture. >>> >> I'm posting >> >>> them now in order to jumpstart the discussion during the >>> >> PCN session >> >>> next week. >>> >>> I apologize that the questions go a bit all over the place. >>> >> I'm trying >> >>> to order them in a way that can be followed. >>> >>> >>> [1] Semantics of the stop-admission signals >>> >>> Pre-congested routers piggyback admission markings onto the traffic >>> flowing through them. The egress that analyzes the volume >>> >> and dynamics >> >>> of these markings and may make a stop-admission decision, which it >>> then signals to the ingress. Agreement so far? >>> >> I agree. >> >> >>> OK, then: What is the semantics of the stop-admission >>> >> signal? A simple >> >>> "stop admitting new flows" seems to require a complementary "start >>> admitting new flows" signal. Or is it "stop admitting new >>> >> flows for a >> >>> time x", which would not need that second signal? >>> >>> The latter seems conceptually simpler and may arguably be a >>> >> bit more >> >>> robust, because the system will un-wedge itself if the >>> "start-admission signal" gets lost. But this approach might end up >>> causing fluctuations during periods of pre-congestion that are >>> significantly longer than x. (Do we expect to support cases where a >>> domain is in a pre-congested state for prolonged periods of time?) >>> >> I cannot remember an explicit discussion and consensus about >> the exact method to signal admission-stop/admission-continue >> from PCN egress to ingress. I find it interesting to have a >> soft state at the PCN ingress node for a time during which it >> must not admit new traffic. This might be useful if an >> admission-continue signal is lost. As an alternative, TCP >> needs to be used for admission-stop/admission-continue >> signalling from PCN egress to ingress. >> >> > > The current architecture work in the wg has not really addressed this > issue yet. Different algs drafts however did take different approaches. > For example, the initial CL-phb work assumes that the CLE measurement is > continuously/peridically sent to the ingress, which admits as long as > the CLE is below a specified threshold, and does not admit when the > threshold is reached. Single marking does the same. 3sm draft marlking > stops admission on receipt of a single admisison market packet and > resumes after a timeout. We actually did not specify this so exactly in 3sm as this was not its major focus: "More specifically, if most of the packets are AS-marked, the PCN traffic rate of at least one of the links in the ingress-egress path has exceeded its admissible rate, i.e. it is AR-overloaded. Therefore, the PCN egress signals "admission-stop" to the admission control entity for the corresponding ingress-egress aggregate such that no further flows are admitted." But maybe this was in the previous explicit-marking draft. > Not yet completely sure what draft-westberg > does about it (still to digest the draft in detail). > > It seems that the architecture should allow both explicit periodic CLE > updates, and a timeout should the CLE feedback is lost. I would argue > that timeout should probably be used as more of an exception measure > than the main mechanism, but the jury is still out. > > >>> (For the "termination" signal going from the egress to the >>> >> ingress, I >> >>> guess the semantics are clear.) >>> >> Not really. We have at least two different options. >> >> 1) Measured rate termination (cl-draft and others) ALL >> packets exceeding the "supportable/tolerable/termination >> rate" are "excess-traffic/termination" marked. The PCN egress >> node measures the rate of marked packets for each >> ingress-egress aggregate, it potentially applies an EWMA to >> the measured result, and signals it to the respective ingress >> which terminates a set of flows with that rate. Therefore, >> the PCN ingress node should know the rates of individual >> flows. >> > > Ideally it would be good if termintation mechanism is directly aware of > the rates of flows it terminates. However, in practice it may suffice > just use the number of flows as an indicator of how many flows to > remove. > > >> In combination with multipath routing, the PCN ingress >> does not know which flows really go over the bottlenecked >> link and need to be terminated, unless the information about >> the marked flows is also signaled from PCN egress to ingress. >> Since all excess-traffic packets are marked, this can be a >> large amount. As an alternative, the PCN node may choose the >> flows for termination facing the same challenges. A minimum >> time between two consecutive termination signals for the same >> ingress-egress aggregate should be respected because it takes >> some time until the first termination signal has stopped its >> flows, the reduced rate is measured and visible in the >> averaged EWMA result. The required marking mechanism for this >> approach is covered as a special case in the 3sm draft >> (slowdown parameter s=0). >> >> The single marking approach is slightly different (the excess >> traffic rate is determined differently), but it works >> similarly with regard to the signaling aspect once the excess >> traffic rate is found. However, there is a difference which >> is important for multipath routing. If a packet is marked, >> this may come from a path where only the admissible rate is >> exceeded or from a path where also the tolerable rate is >> exceeded such that flow termination is required. Thus, in the >> presence of multipath routing, single marking makes it harder >> to find out if a particular flow has been carried over a >> bottlenecked link whose tolerable rate is exceeded >> (termination of that flow helps to reduce the excess traffic) >> or just over another path whose admissible rate is exceeded >> (termination of that flow does not help to reduce the excess traffic). >> >> > > Indeed. This is the price for not using extra marking codepoint and > measurement in the core. Single marking will have to endure some error > in which flows are terminated in the mulipath case. Of course the > moment you add back another measurement and another codepoint, the > ability to deal with multipath then comes back, and the many options of > doing so are described by Michael above. > > >> 2) Marked flow termination (3sm draft aka explicit marking) >> Only SOME packets exceeding the >> "supportable/tolerable/termination rate" >> are "excess-traffic/termination" marked. The PCN egress node >> signals the flow information of each marked packet to the >> corresponding PCN ingress node which terminates this flow >> (several flows may be signalled in one message). As this flow >> was marked, it used the bottlenecked link and is therefore a >> correct candidate to terminate also in case of multipath >> routing. No rate measurement is done. No EWMA smoothing is >> done. The PCN egress node does not need to wait a minimum >> amount of time between two termination signals. The PCN >> ingress node does not need to know the rates of the flows. >> > > It is correct that the ingress does not need to know the rates in this > case, but the other side of this coin is that removing a high-rate flow > may be an overkill if the amount of traffic that needs to be remoived is > samll. So in either case lack of knowledge about the rates may lead to > inaccurate termination decisions with respect to rates. > > >> The termination speed of this approach is fast and can be >> controlled by the slowdown-parameter of the packet marker. >> > > It seems that how fast it really is still needs to be understood. The > speed of termination in the 3sm approach is controlled with the slowdown > parameter, while the EWMA parameters control the seed of reaction of the > other approaches. I think quantification of these things still remains > to be done carefully. > We are working on that issue. > >> >>> [2] Implications of multi-marking schemes >>> >>> I must admit that so far, I have mostly thought of PCN in terms of >>> something similar to Anna's single-marking proposal. >>> >> Meaning that the >> >>> egress would come to a termination decision (rather than a >>> stop-admission decision) when the volume or dynamics of the >>> >> arriving >> >>> markings becomes severe. >>> >>> (Note: That's not to say that I necessarily believe that >>> single-marking should be the technical solution the WG should pick; >>> all I'm saying is that I had so far thought about PCN mostly in this >>> way.) >>> >>> Reading some of the proposals that use multiple kinds of >>> >> markings made >> >>> me realize that I had made some implicit assumptions about how the >>> termination mechanism might operate that were a cause of >>> >> thinking in >> >>> terms of using a single marking. After reading the multi-marking >>> proposals, I'm not sure if these assumptions are shared by >>> >> all of the >> >>> group. I'm also not sure if there is an agreement among the >>> >> different >> >>> multi-marking proposals, either. >>> >> As far as I know, exact marking behaviors using pseudo code >> are only described in the 3sm draft (it explicitly allows >> token bucket and virtual queue implementations, it does not >> exclude other similar implementations, only the behavior is >> described). I think that there is a rough consensus about the >> "multi-marking" schemes, at least I am not aware of any >> written proposal that significantly differs from 3sm. >> This is >> logical as 3sm focuses on this aspect while other drafts >> focus on encoding, signaling, or other aspects. However, I >> might be wrong and I might have missed something. If so, >> please correct me and point me to the section in the right document! >> >> > > Here I am a bit confused by Micael's statement - so perhaps I will try > to say it differently. > > I believe that across all proposals, 5 separate marking approaches have > been described in both admission and termination contexts, and different > drafts use different approaches for different purposes (There may be > more described in draft-westberg - but again I am yet to fully > understand it) > Ooops, sorry, I appologize. Regarding multi-marking I subsumed the two different termination marking algs in 3sm as a single one for termination marking (the one is a special case of the other) and the two different admission marking algs (ramp marking and the pure threshold marking) as another one for admission marking (also here mere threshold marking is a special case of the other, also simulation results showed no difference as far as I can remember). And I really forgot about "excess-rate-proportional marking". Regards, Michael > 1) "ramp" virtual-queue (two thresholds, mark all packets above the high > threshold, mark packets with specified probability between thresholds, > do not mark below the lower threshold > - used for admission in cl-phb > > 2) "step" virtual queue (only one threshold, mark packets above it, do > not mark packets below it > > - used as an option for admission in cl-phb draft > - is equivalent to token-bucket-based implementation of admission > marking in 3sm draft > > 3) excess rate-based virtual marking > - all packets whose measured rate exceeds the configured > termination rate are marked > -> can be implemented by standard token bucket > - used for termination in cl-phb and single-marking > - used for admission in single-marking > > 4) excess rate marking with slow-down > - used in 3sm > - marks a subset of packets exceeding the rate > - can be implemented by adding the slow-down function to token > bucket, as done in CL > > 5) excess-rate-proportional marking > - I believe this is the "encoded" marking in draft-westberg, used > for termination > - marks a fraction of all packets, where the fraction encodes the > amount of overload (but not equal to the amount of overload) > (here I hope the authors of draft-westberg will jump in with > explanations or crrections of the details) > > > >>> With a multi-marking scheme, when a congested router marks packets >>> with _termination_ marks, does it matter _which_ packets (and hence >>> which flows) are marked? Is there an assumption that the >>> >> system will >> >>> terminate those and only those flows? Or is termination marking >>> similar to admission marking, for which piggybacking them onto the >>> current traffic stream is simply a convenient transport mechanism? >>> Meaning that in the latter case, the egress is free to >>> >> terminate flows >> >>> whose packets didn't have congestion markings, and let flows remain >>> whose packets did, as long as whatever decision it comes to >>> >> alleviates >> >>> the congestion? >>> >> The individual marked packets are irrelevant for the flow >> termination result of the "measured rate termination" >> approach while they exactly determine the flows to be >> terminated for the "marked flow termination" >> approach. If the "measured rate termination" wants to cope >> with multipath routing, it should also terminate a subset of >> the marked flows. >> > > Yes. Said in other words, it matters for some proposals and does not > matter for others. > > >>> Schemes where the termination decision is influenced by which flows >>> have received termination marks seem to require per-flow >>> >> state at the >> >>> routers, because they need to be sure that they terminate a >>> >> sufficient >> >>> volume of traffic. That seems to conflict with the goal of the >>> architecture to limit that such state to the domain boundary, right? >>> >> I don't see where extra per-flow states need to be kept when >> the termination decision is influenced by which flows have >> received the termination marks. Interior PCN nodes just mark >> packets for "marked flow termination" as for "measured rate >> termination". No flow states are required inside the PCN >> domain. In both cases the PCN egress nodes communicate the >> outcome of the marking (individual flows or excess traffic >> rate) to the respective flow termination entitiy (wich often is >> - unnecessarily - assumed to be collocated with the PCN >> ingress router). >> Do I miss something? >> > > Also not sure why Lars thinks per-flow state is needed? > > >>> [3] Marking dynamics >>> >>> I've seen two ways in the documents that describe how >>> >> routers should >> >>> mark packets: First, a scheme where the frequency at which a router >>> marks packets is proportional to some level of pre-congestion or >>> congestion. Second, a scheme where a router starts marking _all_ >>> packets when congestion exceeds a certain level. >>> >>> The first scheme transmits much finer-grained information from the >>> routers to the egress, which should benefit the decision algorithm >>> there. The second scheme basically signals a binary >>> >> condition. I can't >> >>> come up with a reason why the second scheme should be the >>> >> better one - >> >>> can anyone explain? >>> >> "Termination/excess-traffic" marking: only those packets are >> marked that exceed the "supportable/tolerable/termination" rate. >> 1) Measured rate termination requires this to determine the >> rate to be terminated. >> > > Actually, in cl-phb and single marking, it is the amount of > *termination- *un*marked packets that determines the desired rate, and > then the excess over this rate is terminated at the ingress. This is > different than terminating the amount of marked packets if there is any > loss in the system. Also, makes some of the problems associated with > timing of removal somehat easier). > > >> 2) Marked flow termination uses an additional slowdown >> parameter to reduce the number of marked flows to avoid >> overtermination as all marked flows are going to be terminated. >> Thus, both cases have a strong reason why not all packets >> should be marked. >> >> Single marking and "Admission/admission-stop" marking in case of >> "multi-marking": >> 1) The single marking approach proposes to mark only a >> fraction of the traffic. Otherwise, there is no room to >> signal excess traffic which is done by just marking more traffic. >> The exact rate of marked packets needs to be determined fast >> which is difficult in the presence of bursty or time-varying >> traffic. 5% error is already a significant difference that >> may impact the admission decision. >> Using EWMA with a LONG memory to improve the measurement >> accuracy delays the recognition of increased traffic rates. I >> guess that this problem is not visible for periodic traffic. >> >> > > Single-marking simulation draft actually provides some insight on the > issue of sensitivity to parameters. As it is not directly related to > Lars's question, will not discuss it here, though. > > >> 2) The approach presented in the 3sm draft marks all packets >> with admission-stop as soon as the admissible rate is exceeded. >> Either 0% or 100% of the traffic is marked when the rate on >> the link is clearly below or above the admissible rate. >> Therefore, 5% error in the measurement process are >> negligible. The measurement can be done faster. >> The "all or nothing" approach can be seen as a "strong" >> signal which can be recognized more easily and therefore >> faster than an exact rate can be determined. >> >> However, further simulations are required to underpin this speculation >> >> > > Indeed. A sensitivity study to the timeout parameter value is needed. > The other side of the coin of "strong" signal is that for traffic that > is not very smooth reacting to a single mark to stop admission may > result in substantial underadmission. Michael is quite right that > additional study is required to quantify that. Also a subject of a > separate discussion, I think. > > Best, > Anna > > >> Regards, >> >> Michael >> >> >>> Thanks and see you next week, >>> Lars >>> >>> >> ---------------------------------------------------------------------- >> >>> -- >>> >>> _______________________________________________ >>> PCN mailing list >>> PCN@ietf.org >>> https://www1.ietf.org/mailman/listinfo/pcn >>> >>> >> -- >> Dr. Michael Menth, Assistant Professor >> University of Wuerzburg, Institute of Computer Science Am >> Hubland, D-97074 Wuerzburg, Germany, room B206 >> phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 >> mailto:menth@informatik.uni-wuerzburg.de >> http://www3.informatik.uni-wuerzburg.de/research/ngn >> >> >> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> >> -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Sat Jul 21 02:17:29 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IC8HQ-0006a6-I4; Sat, 21 Jul 2007 02:17:28 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IC8HP-0006Zz-09 for pcn-confirm+ok@megatron.ietf.org; Sat, 21 Jul 2007 02:17:27 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IC8HO-0006Zq-I9 for pcn@ietf.org; Sat, 21 Jul 2007 02:17:26 -0400 Received: from rotterdam.ewi.utwente.nl ([130.89.10.5]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IC8HM-00014K-V5 for pcn@ietf.org; Sat, 21 Jul 2007 02:17:26 -0400 Received: from webmail.cs.utwente.nl (janus.ewi.utwente.nl [130.89.10.26]) by rotterdam.ewi.utwente.nl (8.13.6/8.13.6) with SMTP id l6L6HH7B005867; Sat, 21 Jul 2007 08:17:17 +0200 (MEST) Received: from 212.123.202.81 (auth. user karagian@imap2.cs.utwente.nl) by webmail.cs.utwente.nl with HTTP; Sat, 21 Jul 2007 06:17:16 +0000 To: pcn@ietf.org, philip.eardley@bt.com Subject: RE: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt Date: Sat, 21 Jul 2007 06:17:16 +0000 X-Mailer: IlohaMail/0.8.13 (On: webmail.cs.utwente.nl) Message-ID: In-Reply-To: <004c01c7cb00$f65088a0$4c0d5982@dynamic.ewi.utwente.nl> From: "Georgios Karagiannis" Bounce-To: "Georgios Karagiannis" MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.71 () FVGT_s_MULTI_OBFU_2,J_CHICKENPOX_93 X-Scanned-By: MIMEDefang 2.52 on 130.89.10.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0rc3 (rotterdam.ewi.utwente.nl [130.89.10.5]); Sat, 21 Jul 2007 08:17:23 +0200 (MEST) X-Spam-Score: 0.0 (/) X-Scan-Signature: 4cbeb0f20efb229aa93fae1468d20275 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org On 7/20/2007, "Georgios Karagiannis" wrote: >Hi Phil > >Thank you very much for the comments! >Please see some remarks in line! > > >> -----Original Message----- >> From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] >> Sent: donderdag 19 juli 2007 12:12 >> To: khchan@nortel.com; pcn@ietf.org >> Subject: RE: [PCN] Fwd: I-D >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> Kwok, Georgios >> >> I read your draft. I have quite a lot of comments, but the >> basic msg is that i think it's a suitable starting point for >> a WG draft (towards the Charter milestone on this subject) - thanks. > Georgios: Thank you very much! >> >> 1. motivation & goals >> this seems quite long for this draft, maybe the material is >> more suitable elsewhere eg architecture draft? > Georgios: We will try to reduce the text! >> >> 2. PCN encoding .. in current PCN .. mechanisms & Appendix I >> didn't find it useful to present the various proposed >> mechanisms. The dependence between encoding & mechanism >> (marking algo & PCN-boundary-node reaction) seem pretty weak >> to me. In fact I think there's almost none, except in terms >> of the number of codepoints that a proposed mechanism uses. >> (Even this is not clear-cut; for example 'Affected marking' >> could, I think, be easily added to those proposals that don't >> mention it, or indeed removed from those proposals that do.) >> >> So can this section simply say that different proposals >> require different numbers of encoding codepoints, and explain >> this in a paragraph? > Georgios: Please note that this draft should be a survey. Thus what we have done we have checked the existing PCN like mechanisms and briefly described them. In this way we could described which PCN features and which encoding modes/states are supported(and thus are available) by these mechanisms. I would like to keep this section. >> >> Incidentally, I found it a bit confusing to describe "not >> congested" as a feature - at least, it doesn't seem a feature >> in the way that adm ctrl & flow termination are features. In >> fact, I found the discussion of 'features' in S3 & 4 a bit >> misleading (stick with codepoints). > Georgios: I think that a better term would be PCN encoding features, instead of PCN features. In this case "not congested" admission control and flow termination can be seen to belong in the same category. What we actually wanted to do is to emphaisze and differentiate between PCN encoding features and encoding modes/states. This is because one PCN encoding feature can be accomplished using more than one encoding modes/states >> >> I think phrases like "requirement for xx marking" could be >> better expressed (are they reqts? It's a choice about how >> many codepoints we >> have) Georgios: Do you have any suggestion on naming? >> >> 3. survey of encoding >> the table is very useful. >> >> Would it be better grouping the options in terms of the >> number of codepoints required? Ie if the mechanism needs 3 >> codepoints here are your options; if it needs 4 here they are etc. Georgios: I am not sure if this will encounter what we wanted to do. Please note that we intended to also include the PCN encoding features that are supported by each option. >> Should there be an option similar to option 9, but with PCN dscp? >> Should there be an option similar to option 10/11, but with 2 DSCPs? >> (that single marking mechanism could use) Georgios: I do not understand this remarks. Maybe we can discuss them in Chicago >> >> Don't understand NDS-CE Georgios: will clarify! >> >> There are many typos where 'none' should be 'non' (non PCN capable >> transport) Georgios: agree it is a typo! >> >> In option 2 (& 6, 7) what does ECT(A) & ECT(T) mean? (I >> remember back in Briscoe-cl-phb we looked at an option where >> PCN marking was signalled by a *change* of codepoint, maybe >> it's referring to this idea? ie Adm marking is 01 -> 00 & >> Termination marking is 10 -> 11.) Georgios: yes this is taken from Briscoe-cl-phb draft. >> >> S3.4 use of IPFIX. I know you included this section because >> the charter seems to suggest it - but I must admit to finding >> it out of place in this doc. Georgios: I think it is good to include an option that uses for encoding and transport a different channel than the data path. >> >> >> 4. comparison >> I wonder if it's worth starting this section with all the >> points that relate to how many codepoints there should be, >> and later handle the more detailed aspects. >> >> Aspects of the first part: >> - will there be non-PCN traffic in the DS network? (surely a >> clear yes, ie we need a separate PCN DSCP(s)) >> - MPLS (which has limited codepoint space) [discussed in >> earlier Briscoe-cl-architecture drafts - could adapt text from there] >> - whether 'affected marking' is needed /useful [no consensus >> at present >> - based on your text in S2] >> - whether adm ctrl & termination ctrl can be driven by the >> same encoding Georgios: Check and discuss the above issues in Chicago >> >> - perhaps that adm ctrl & flow termination mechanisms are not >> required to both be deployed (just one could be) >> - etc Georgios: yes, but many scenarios require both ... Therefore is good to emphasize which of them support both and which not! >> >> this would actually shorten some of the draft, eg S4.2.3 >> could basically disappear. >> >> >> some of the ECN nonce discussion I found hard to follow >> 4.1.5. explain what 'alternate ECN semantics' means >> S4.2.5 I didn't follow what cases you were distinguishing. >> there are a couple of issues at the high level: whether ECN >> nonce is useful with PCN; backwards compatibility of PCN with >> ECN nonce, eg in an 'unusual situation' such as the PCN pkt >> encounters an 'old' (ECN) router. Georgios: we have to update and enlarge section 4.2.5 >> >> could mention the discussion we had about the charter >> assuming a single domain, but we're going to keep strongly in >> mind that want it to work multi-domain in future. This seems >> esp important when it comes to encoding - after all, if it's >> just your domain you can do what you like. >> The multi-domain consideration has several impacts I think: >> * makes standardising encoding important >> * need to consider rfc4774 [because the issues it raises are >> probably more significant in the inter-domain case than in >> one domain under one operator's control] georgios: Thus you propose to include the multi-domain support as an additional criterion >> * need to consider limitations about encoding from >> draft-briscoe-re-pcn-border-cheat-00.txt [proposed mechanism >> for making PCN work inter-domain] Georgios: We will discuss this in CHicago Best regards, Georgios >> >> best wishes - see you in Chicago! >> phil >> >> > -----Original Message----- >> > From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> > Sent: 05 July 2007 21:13 >> > To: pcn@ietf.org >> > Subject: [PCN] Fwd: I-D >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> > >> > PCN WG: >> > I would like to bring to your attention the availability of the >> > initial version of PCN Encoding Comparison draft. >> > >> > Please review and comment. And discuss on the PCN list. >> > >> > Thank you very much and looking forward to your comments. >> > -- Kwok and Georgios -- >> > >> > >To: i-d-announce@ietf.org >> > >Cc: >> > >From: Internet-Drafts@ietf.org >> > >Date: Thu, 05 Jul 2007 13:15:02 -0400 >> > >X-Scan-Signature: 14582b0692e7f70ce7111d04db3781c8 >> > >Subject: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt >> > >X-BeenThere: i-d-announce@ietf.org >> > >X-Mailman-Version: 2.1.5 >> > >Reply-To: internet-drafts@ietf.org >> > >List-Id: i-d-announce.ietf.org >> > >List-Unsubscribe: >> , >> > > >> > >List-Archive: >> > >List-Post: >> > >List-Help: >> > >List-Subscribe: >> , >> > > >> > >X-Spam-Score: 2.3 >> > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >> > ecarhea1.nortel.com >> > >X-Spam-Tests: FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, >> > > NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D1 >> > >X-DNSBL-Score: -50 >> > >X-DNSBL-Servers: bl.nortel.com >> > >X-SMTP-HELO: megatron.ietf.org >> > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >> > >X-SMTP-RCPT-TO: >> > >> >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharr >> ath@nortel >> .c >> > >> om,babiarz@nortel.com,aceler@nortel.com,simmonds@nortel.com,hu >> iwc@nortel >> .c >> > >> om,amuhanna@nortel.com,gparsons@nortel.com,mchen@nortel.com,kh >> chan@norte >> l. >> > com >> > >X-SMTP-PEER-INFO: megatron.ietf.ORG [156.154.16.145] >> > >X-SMTP-REASON: PASSED >> > >X-SMTP-ID: 1183656101.14019435 >> > >X-OriginalArrivalTime: 05 Jul 2007 17:21:42.0459 (UTC) >> > >FILETIME=3D[F47A20B0:01C7BF28] >> > > >> > >A New Internet-Draft is available from the on-line Internet-Drafts >> > >directories. >> > > >> > > >> > > Title : Pre-Congestion Notification Encoding >> > Comparison >> > > Author(s) : K. Chan, G. Karagiannis >> > > Filename : >> draft-chan-pcn-encoding-comparison-00.txt >> > > Pages : 36 >> > > Date : 2007-7-5 >> > > >> > > DiffServ mechanisms have been developed to support Quality of >> Service >> > > (QoS). However, the level of assurance that can be >> provided with >> > > DiffServ without substantial over-provisioning is >> limited. Pre- >> > > Congestion Notification (PCN) investigates the use of per-flow >> > > admission control to provide the required service >> guarantees for >> the >> > > admitted traffic. While admission control will protect the QoS >> under >> > > normal operating conditions, an additional flow termination >> > > mechanism is necessary in the times of heavy congestion (e.g. >> caused >> > by route >> > > changes due to link or node failure). >> > > >> > > Encoding and their transport are required to carry the >> congestion >> and >> > > pre-congestion information from the congestion and >> pre-congestion >> > > points to the decision points. This document provides a survey >> of >> > > several encoding methods, using comparisons amongst >> them as a way >> to >> > > explain their strengths and weaknesses. >> > > >> > > >> > > >> > >A URL for this Internet-Draft is: >> > >> >http://www.ietf.org/internet-drafts/draft-chan-pcn-encoding-c >> omparison- >> > 00.txt >> > > >> > >To remove yourself from the I-D Announcement list, send a >> message to >> > >i-d-announce-request@ietf.org with the word unsubscribe in the body >> of >> > >the message. >> > >You can also visit >> https://www1.ietf.org/mailman/listinfo/I-D-announce >> > >to change your subscription settings. >> > > >> > >Internet-Drafts are also available by anonymous FTP. Login >> with the >> > >username "anonymous" and a password of your e-mail address. After >> > >logging in, type "cd internet-drafts" and then "get >> > >draft-chan-pcn-encoding-comparison-00.txt". >> > > >> > >A list of Internet-Drafts directories can be found in >> > >http://www.ietf.org/shadow.html or >> > >ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> > > >> > >Internet-Drafts can also be obtained by e-mail. >> > > >> > >Send a message to: >> > > mailserv@ietf.org. >> > >In the body type: >> > > "FILE /internet-drafts/draft-chan-pcn-encoding-comparison- >> > 00.txt". >> > > >> > >NOTE: The mail server at ietf.org can return the document in >> > > MIME-encoded form by using the "mpack" utility. >> To use this >> > > feature, insert the command "ENCODING mime" before the >> "FILE" >> > > command. To decode the response(s), you will >> need "munpack" >> or >> > > a MIME-compliant mail reader. Different >> MIME-compliant mail >> > readers >> > > exhibit different behavior, especially when dealing with >> > > "multipart" MIME messages (i.e. documents which have been >> split >> > > up into multiple messages), so check your local >> documentation on >> > > how to manipulate these messages. >> > > >> > >Below is the data which will enable a MIME compliant mail reader >> > >implementation to automatically retrieve the ASCII version of the >> > >Internet-Draft. >> > > >> > >Content-Type: text/plain >> > >Content-ID: <2007-7-5125842.I-D@ietf.org> >> > > >> > >ENCODING mime >> > >FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt >> > > >> > > >> > >> >> omparison- >> > 00.txt> >> > >_______________________________________________ >> > >I-D-Announce mailing list >> > >I-D-Announce@ietf.org >> > >https://www1.ietf.org/mailman/listinfo/i-d-announce >> > >> > >> > >> > >> > _______________________________________________ >> > PCN mailing list >> > PCN@ietf.org >> > https://www1.ietf.org/mailman/listinfo/pcn >> >> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Sat Jul 21 02:28:31 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IC8S7-0006Q7-8e; Sat, 21 Jul 2007 02:28:31 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IC8S5-0006N2-T6 for pcn-confirm+ok@megatron.ietf.org; Sat, 21 Jul 2007 02:28:29 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IC8S5-0006Mu-J0 for pcn@ietf.org; Sat, 21 Jul 2007 02:28:29 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IC8S3-0001DY-Sq for pcn@ietf.org; Sat, 21 Jul 2007 02:28:29 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 4275576E2; Sat, 21 Jul 2007 08:28:25 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 3432A77AC; Sat, 21 Jul 2007 08:28:25 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id DD73977A6; Sat, 21 Jul 2007 08:28:24 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6L6SOh30015; Sat, 21 Jul 2007 08:28:24 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id B66186F58E; Sat, 21 Jul 2007 08:22:36 +0200 (CEST) Message-ID: <46A1A6BB.6070603@informatik.uni-wuerzburg.de> Date: Sat, 21 Jul 2007 08:24:59 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Georgios Karagiannis Subject: Re: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt References: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC344@E03MVZ1-UKDY.domain1.systemhost.net> <75A199C5D243C741BF3D3F1EBCEF9BA5019DC347@E03MVZ1-UKDY.domain1.systemhost.net> <001f01c7cadc$5edd0f30$4c0d5982@dynamic.ewi.utwente.nl> <002101c7cae4$4a4ef030$4c0d5982@dynamic.ewi.utwente.nl> In-Reply-To: <002101c7cae4$4a4ef030$4c0d5982@dynamic.ewi.utwente.nl> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: f8184d7d4d1b986353eb58ea3e887935 Cc: Lars.westberg@ericsson.com, pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Georgios, thank you very much for this email. It clarified things that I haven't understood or overseen when reading the draft. Georgios Karagiannis wrote: > Hi Phil, Michael, Joe > > I have read the 3sm draft, see below, and quicly compared it with the LC-PCN > draft. > > http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt > > >From a quick comparison I could derive is the following: > * Both algorithms can provide admission control, flow termination and > ECMP handling during admission control and flow termination. > > * Both algoriuthms use excess rate measurements at the interior. The > semantics are the same, but > the implementation type is different, token bucket versus bandwidth > measurements. > 3sm does not perform excess rate measurement, but a token bucket marks excess traffic. Interior routers do not calculate rates! > * Both algorithms use probing during the admission control process and the > egress rejects a > request when they are in "admission-stop" (or "congestion notification" > state. > 3sm allows probing as an option when necessary, but it is not the default mode. > The LC-PCN can support two encoding modes/states: > * One encoding mode/state for admission control and flow termination > In the current version only this option is described in detail. The marking > and metering used > For admission control in 3SM and LC-PCN are different. Note that the 3SM > does not use the reduction factor "s" > In case of admission control, while in LC-PC, when the "encoded DSCP" > marking is used, then the relation factor between metering and marking (N) > is used. > What's the benefit of using the "relation factor N" for admission marking? I haven't understood the objective of that mechanism. > * Two encoding mode/state: one for admission control and one for flow > termination > (in this case the "notified DSCP"" is used for admission control and the > "encoded DSCP" > Is used for flow termination. Note that in this option the factor N is not > used for admission control in LC-PCN. > In this case the metering and marking > Schemes used in > LC-PCN and 3SM are semantically very similar. > > * For flow termination, when only one value of the "s" parameter is used in > whole PCN domain (in LC-PCN one N value should be used in whole domain) then > the metering and marking algorithms in 3SM and LC-PCN are from a semantic > point of view the same. I'm not so sure whether they are the same. What's the objective of using N in combination with termination marking? > The mechanisms at the edges are somehow different. > In 3SM all flows that are marked are selected for termination, while in > LC-PCN flows the excess rate is measured and according to this rate > (corrected by using the value of N) > a number of flows that are "affected marked" and "encoded marked" are > selected for termination. > Note that the LC-PCN algorithm at the egress takes into account the priority > of flows. > However, the LC-PCN algorithm also works when no priority differentiation > between flows is used. > Best regards, Michael > Best regards, > Georgios > > > > > > I think that semantically the metering and marking mechanism are similar. > hen the parameter "s" is set to be equal in whole PCN domain > > >> -----Original Message----- >> From: Georgios Karagiannis [mailto:karagian@cs.utwente.nl] >> Sent: vrijdag 20 juli 2007 16:44 >> To: 'Georgios Karagiannis' >> Subject: RE: [PCN] Fwd: I-D >> ACTION:draft-westberg-pcn-load-control-00.txt >> >> >> >> >> ________________________________ >> >> From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] >> Sent: donderdag 19 juli 2007 18:01 >> To: Lars.westberg@ericsson.com; pcn@ietf.org >> Subject: RE: [PCN] Fwd: I-D >> ACTION:draft-westberg-pcn-load-control-00.txt >> >> >> >> Lars >> >> >> >> I have just been reading >> http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.t >> xt. it seems a very similar proposal? So one way it might be >> useful to clarify your proposal is to compare it with the >> babiarz proposal. >> >> >> >> Could you clarify how it differs: >> >> * in the 2 algorithms at the PCN-interior-nodes, ie for >> admission-marking & termination-marking >> * in the encoding used for for admission-marking & >> termination-marking (I think it's simply that draft-babiarz >> doesn't define encodings (ECN field mentioned in passing), >> whereas draft-westberg says use new dscps). >> * in the reaction at the PCN-boundary-nodes >> >> >> >> thanks, >> >> phil >> >> -----Original Message----- >> From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] >> Sent: 19 July 2007 15:22 >> To: Lars.westberg@ericsson.com; pcn@ietf.org >> Subject: RE: [PCN] Fwd: I-D >> ACTION:draft-westberg-pcn-load-control-00.txt >> >> >> >> Lars >> >> >> >> I started reading your draft, but have a couple of >> clarification questions about what you're proposing. >> >> >> >> As I understand it:- >> >> * there are two marking algorithms on the interior routers >> >> * Admission-marking: if the rate exceeds threshold-1, >> then all pkts are Adm marked >> >> * Termination-marking: if the rate exceeds threshold-2, >> the excess-traffic rate is measured and a fraction (1/N) of >> the excess rate is Termination marked. >> >> >> >> The adm marking algo is a bit unclear to me, sometimes >> it's described as marking all pkts as soon as threshold-1 is >> exceeded - sometimes (eg S4.1.3) it seems that a fraction of >> the excess traffic is marked (same idea as above under " * >> Termination marked"). Which is correct? >> >> >> >> I'm also not sure what "encoded DSCP" and "notified >> DSCP" mean. Do they correspond to Admission-marking and >> Termination-marking, or do they mean something else? >> >> >> >> A point that doesn't just apply to this draft: >> >> >> http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-pk >> t-mark-00.txt >> which looks at "whether to allow for packet size when the >> network codes or when the transport decodes congestion >> notification." This draft argues that, when marking, the >> packet size should not be taken into account. >> >> Thanks >> phil >> >> >> >> -----Original Message----- >> From: Lars Westberg [mailto:Lars.westberg@ericsson.com] >> Sent: 25 June 2007 12:22 >> To: pcn@ietf.org >> Subject: [PCN] Fwd: I-D >> ACTION:draft-westberg-pcn-load-control-00.txt >> >> >> >> Dear all >> >> The "LC-PCN - The Load Control PCN solution" draft can >> be found via: >> >> http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-co >> ntrol-00.txt >> >> >> Abstract >> >> There is an increased interest of simple and scalable >> resource provisioning >> solution for Diffserv network. >> The Load Control PCN (LC-PCN) addresses the following issues: >> >> 1. Admission control for real time data flows in >> stateless Diffserv Domains >> 2. Flow termination: Termination of flows in case of >> exceptional events, >> such as severe congestion after re-routing. >> Admission control in a Diffserv stateless domain is a >> combination >> of: >> >> 1. Probing, whereby a probe packet is >> sent along the forwarding path in a network to determine >> whether a flow can be admitted based upon the current >> congestion state of the network >> >> 2. Admission control based on data marking, whereby >> in congestion >> situations the data packets are marked to notify >> the egress node >> that a congestion occurred on a particular ingress to egress >> path. >> The scheme provides the capability of controlling >> the traffic load in >> the network without requiring signaling or any >> per-flow processing in >> the core routers. The complexity of Load Control is >> kept to a minimum >> to make implementation simple. >> >> Kind regards, >> >> Lars >> >> >> >> -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Sun Jul 22 22:10:17 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ICnNJ-0005YU-8O; Sun, 22 Jul 2007 22:10:17 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ICnNH-0005YP-Qg for pcn-confirm+ok@megatron.ietf.org; Sun, 22 Jul 2007 22:10:15 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ICnNH-0005YG-Dc for pcn@ietf.org; Sun, 22 Jul 2007 22:10:15 -0400 Received: from hiltonsmtp.worldspice.net ([216.37.94.58]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1ICnNG-0007eq-RY for pcn@ietf.org; Sun, 22 Jul 2007 22:10:15 -0400 Received: (qmail 30788 invoked by uid 0); 23 Jul 2007 02:02:40 -0000 Received: by simscan 1.2.0 ppid: 30782, pid: 30784, t: 1.1357s scanners: clamav: 0.90.2/m: spam: 3.1.8 X-Spam-Checker-Version: SpamAssassin 3.2.1 (2007-05-02) on hiltonsmtp.worldspice.net X-Spam-Level: **** X-Spam-Status: No, score=4.2 required=6.5 tests=ALL_TRUSTED,BAYES_99, HTML_MESSAGE autolearn=disabled version=3.2.1 Received: from unknown (HELO jys3105121962) (z24109@67.97.210.2) by hiltonsmtp.worldspice.net with ESMTPA; 23 Jul 2007 02:02:39 -0000 Message-ID: <003b01c7ccce$93b17b80$4fa81cac@jys3105121962> From: "Tina TSOU" To: Date: Sun, 22 Jul 2007 21:09:54 -0500 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Spam-Score: 0.0 (/) X-Scan-Signature: 156eddb66af16eef49a76ae923b15b92 Subject: [PCN] thoughts for draft-charny-pcn-single-marking-02 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1053948549==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============1053948549== Content-Type: multipart/alternative; boundary="----=_NextPart_000_0038_01C7CCA4.A6D57BA0" This is a multi-part message in MIME format. ------=_NextPart_000_0038_01C7CCA4.A6D57BA0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable Hi all, Some thoughts came to my mind for draft-charny-pcn-single-marking-02.txt = as below. 1) If the single marking scheme could solve all the problems that = the dual marking scheme could, only with very little tradeoffs? What are = the biggest tradeoffs? 2) If single marking can solve all the problems, why not consider = give up dual marking approach? 3) Per draft-charny-pcn-single-marking-02, single marking approach = can transit to dual marking approach, why not directly design the dual = marking directly, is there reason to keep the single marking approach? 4) A) How to mark the interim node? Single marking approach = requires marking Excess Traffic; dual marking approach does not require = this, so they are impossible to be compatible with each other at this = point. May dual marking approach adopt only mark Excess Traffic method, = whatever for Admission Rate or Termination Rate? B) Egress and Ingress measurement basis and decision basis are different = for single marking and dual marking approaches. Via the configuration to = let both working modes work together, both modes can co-exist, but in = fact they don=A1=AFt have compatibility. Then why do we do it? C) Since single marking and dual marking don=A1=AFt have compatibility, = and solve the almost the same problem, do we need to select and only = keep one approach? =20 =20 Tks:) B. R. Tina ------=_NextPart_000_0038_01C7CCA4.A6D57BA0 Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi all,

Some thoughts came to my mind for=20 draft-charny-pcn-single-marking-02.txt as below.

1)     =20 If the single = marking scheme=20 could solve all the problems that the dual marking scheme could, only = with very=20 little tradeoffs? What are the biggest = tradeoffs?

2)     =20 If single marking = can solve=20 all the problems, why not consider give up dual marking = approach?

3)     =20 Per=20 draft-charny-pcn-single-marking-02, single marking approach can transit = to dual=20 marking approach, why not directly design the dual marking directly, is = there=20 reason to keep the single marking approach?

4)     =20 A) How to mark = the interim=20 node? Single marking approach requires marking Excess Traffic; dual = marking=20 approach does not require this, so they are impossible to be compatible = with=20 each other at this point. May dual marking approach adopt only mark = Excess=20 Traffic method, whatever for Admission Rate or Termination=20 Rate?

B) Egress and Ingress measurement = basis and=20 decision basis are different for single marking and dual marking = approaches. Via=20 the configuration to let both working modes work together, both modes = can=20 co-exist, but in fact they don=A1=AFt have compatibility. Then why do we = do=20 it?

C) Since single marking and dual = marking don=A1=AFt=20 have compatibility, and solve the almost the same problem, do we need to = select=20 and only keep one approach?

 

 

Tks:)

 

B. R.

Tina

------=_NextPart_000_0038_01C7CCA4.A6D57BA0-- --===============1053948549== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============1053948549==-- From pcn-bounces@ietf.org Mon Jul 23 07:16:24 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ICvto-0006aV-M9; Mon, 23 Jul 2007 07:16:24 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ICvtm-0006a5-VX for pcn-confirm+ok@megatron.ietf.org; Mon, 23 Jul 2007 07:16:23 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ICvtj-0006Yn-2l for pcn@ietf.org; Mon, 23 Jul 2007 07:16:19 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1ICvth-0002mv-IS for pcn@ietf.org; Mon, 23 Jul 2007 07:16:19 -0400 Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 23 Jul 2007 12:16:16 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Mon, 23 Jul 2007 12:16:16 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 118518937590; Mon, 23 Jul 2007 12:16:15 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.203]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6NBFv9i008051; Mon, 23 Jul 2007 12:16:12 +0100 Message-Id: <5.2.1.1.2.20070722215415.02bd4de8@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Sun, 22 Jul 2007 22:54:20 +0100 To: "Kwok-Ho Chan" From: Bob Briscoe Subject: Re: [PCN] EncodingCompDraftIssue#1: Reliance on DiffServ for traffic separation In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -0.4 () ALL_TRUSTED,DATE_IN_PAST_12_24 X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 23 Jul 2007 11:16:16.0519 (UTC) FILETIME=[E308B170:01C7CD1A] X-Spam-Score: 1.8 (+) X-Scan-Signature: d8ae4fd88fcaf47c1a71c804d04f413d Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Kwok, I think no-one answered your question below that is a pre-requisite for the whole encoding comparison. See embedded for my response. At 17:37 10/07/2007, Kwok-Ho Chan wrote: >This is the start of Issue #1 for draft-chan-pcn-encoding-comparison-xx.txt. > >In -00 of the Encoding Comparison draft, >we have organized the encoding choices and made some assumptions >on the possible use of DiffServ for the purpose of separating the PCN traffic >from all other traffic. > >Would want to test this assumption by making it the Issue #1 for the >Encoding Comparison draft: > >"Should the PCN WG requires the use of DiffServ (or some other mechanism) >to separate the PCN (packet) traffic from all other (packet) traffic?" May I re-write this question with a specific example, to ensure everyone understands (and to confirm I've understood your question)? How do we distinguish three states like these: Option X Option Y 0... other non-EF, non-PCN states DSCP0... DSCP0... 1 EF scheduling without PCN marking DSCP1 DSCP1 + ECN0 2 EF scheduling with PCN marking DSCP2 DSCP1 + ECN1 In both cases, the DSCP distinguishes PCN marking from not, but in Option Y PCN is turned on by the DS field *combined* with the ECN field. A packet's DSCP says what scheduling behaviour the interface should use to handle that packet. It can also say that the packet should experience a congestion marking behaviour (3168 says all PHBs get the default 3168 ECN marking behaviour unless the PHB spec defines otherwise). But there are the above two ways to get the same scheduling behaviour with and without marking during (pre-)congestion. I don't mind which, but these are options that have to be added to the mix to be decided. Actually, given a free choice I'd prefer Option Y, as it's got the same logic as RFC3168 ECN. Bob >The result of discussion on this Issue #1 will affect how we compare the >different >Encoding choices (including the use of ECN bits and other DSCPs). > >This assumption on requirement may also affect the Requirements on >Metering Algorithms >and Marking Semantics as we go forward. > >A secondary (for the future) idea that may play into this discussion is that >should we use PCN on other real-time traffic service classes? Should these >different real-time service classes be separated by the use of DiffServ? > >Thanks! >-- Kwok -- > > > > > >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www1.ietf.org/mailman/listinfo/pcn ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 23 12:06:48 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID0Qq-0006jh-Do; Mon, 23 Jul 2007 12:06:48 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ID0Lp-0007u0-HA for pcn-confirm+ok@megatron.ietf.org; Mon, 23 Jul 2007 12:01:37 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ID0Lp-0007rT-63 for pcn@ietf.org; Mon, 23 Jul 2007 12:01:37 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID0C8-0000Mw-B2 for pcn@ietf.org; Mon, 23 Jul 2007 11:51:36 -0400 Received: from web33001.mail.mud.yahoo.com ([209.191.69.116]) by chiedprmail1.ietf.org with smtp (Exim 4.43) id 1ID0C6-0000M0-Rq for pcn@ietf.org; Mon, 23 Jul 2007 11:51:36 -0400 Received: (qmail 45317 invoked by uid 60001); 23 Jul 2007 15:51:34 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=6KmmyVOYdFHFwDrE6wxbCUv9O5r61rNu9698aLgC5FF4ptbM6fHzEjFt3KOBiUFpvj1DM1d4j6mhGvk2Rha30Nnv2JdBOw4qqbdHfCYazjKCxNbEAn4EVQ9q8q1tIqPkaVnAPRY0iEm/X9YtjjT5VwXtiO5BlXZ9ckq+WeIyoXI=; X-YMail-OSG: _FhhCOkVM1mdFYuC6oqU4IneQD6N3XtiO5J0FTSEC47aj_UvQJ_G2ZoW1Ci0qn_o0H0m3GH9tw-- Received: from [130.129.54.93] by web33001.mail.mud.yahoo.com via HTTP; Mon, 23 Jul 2007 08:51:34 PDT Date: Mon, 23 Jul 2007 08:51:34 -0700 (PDT) From: Anna Charny Subject: re: [PCN] thoughts for draft-charny-pcn-single-marking To: pcn@ietf.org MIME-Version: 1.0 Message-ID: <322832.44980.qm@web33001.mail.mud.yahoo.com> X-Spam-Score: 0.0 (/) X-Scan-Signature: 8de5f93cb2b4e3bee75302e9eacc33db X-TMDA-Confirmed: Mon, 23 Jul 2007 12:01:37 -0400 X-Mailman-Approved-At: Mon, 23 Jul 2007 12:06:48 -0400 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0271353707==" Errors-To: pcn-bounces@ietf.org --===============0271353707== Content-Type: multipart/alternative; boundary="0-815086369-1185205894=:44980" Content-Transfer-Encoding: 8bit --0-815086369-1185205894=:44980 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Hello Tina, Here are some answers to your questions, below. >Hi all, >Some thoughts came to my mind for draft-charny-pcn-single-marking-02.txt as below. >1) If the single marking scheme could solve all the problems that the dual marking > scheme could, only with very little tradeoffs? What are the biggest tradeoffs? > Well, I first want to emphasize that there is no clear view at the moment of which dual-marking approach to choose. Since there are three substantially different proposals with substantially different properties, it is hard to answer your questions in a way that would apply to all dual-marking proposals. In draft-charny-pcn-single-marking we attempt to quantify performance tradeoffs with respect to the specific dual marking approach that was proposed in various draft-briscoe drafts prior to the PCN BOF. Here are some (although not all) points from the single marking draft: * single marking saves a codepoint and allows core equipment to do only one metering/marking instead of two (important since it is done in the forwarding path). This point provides the key motivation. A secondary motivation is that it can be implemented with a (single) token bucket which most of the equipment can support today. * with single marking, there is some degree of accuracy lost in the ability to deal with multi-path routing (the extent of comparative loss of accuracy differs for different dual-marking approaches) * there are some tradeoffs in the flexibility of traffic engineering (see appropriate section in the draft-charny-single-marking) - this tradeoff will be the same in comparison with other dual-marking approaches * there are some performance tradeoffs (discussed in the draft in comparison with *specific* dual marking approach). Note that performance tradeoffs will be different for *different* dual-marking schemes currently on the table. * it is unclear how to deal with anti-cheating end-to-end (something virtual-queue based approach previously discussed in several draft-briscoe drafts dealt with). Note here that it is equally unclear how to deal with the anti-cheating issue with other dual marking approaches proposed in draft-babiarz and draft-westberg. >2) If single marking can solve all the problems, why not consider give up dual marking > approach? see above tradeoffs. One can be prepared to live with those tradeoffs in some environments but not in others. >3) Per draft-charny-pcn-single-marking-02, single marking approach can transit to > dual marking approach, why not directly design the dual marking directly, is there > reason to keep the single marking approach? the key reasons to allow single marking would be to avoid requiring the complexity of two metering/marking in the forwarding path, saving codepoints where necessary, and to allow quick implementations the key reason to eventually get to dual marking would be to allow eventually remove the restrictions/tradeoffs and get a more flexible scheme. >4) A) How to mark the interim node? Single marking approach requires marking > Excess Traffic; dual marking approach does not require this, so they are impossible > to be compatible with each other at this point. I think this may be some misconception here. First I note that dual marking as described in various draft-briscoe drafts requires both excess rate and virtual queue marking, so both require excess rate marking. Other dual marking drafts require yet different versions of marking. Single marking draft argues that if a device implements only excess rate marking, then single marking approach can be used. If a device implements both excess rate marking and virtual-queue marking, then the specific version of dual marking (that of draft-briscoe...) can be used. single-marking draft does not address at the moment whether and how single marking can live with other dual-marking approaches. >May dual marking approach adopt only mark Excess Traffic method, whatever for > Admission Rate or Termination Rate? see above >B) Egress and Ingress measurement basis and decision basis are different for single > marking and dual marking approaches. I note here that these decisions are also different for the multiple dual-marking approaches proposed :-). >Via the configuration to let both working modes work together, both modes can co >exist, but in fact they don’t have compatibility. Then why do we do it? It is probably useful to note that the measurement functions and decisions are exactly the same for single-marking and the specific dual-marking draft proposed in the briscoe drafts. So the implementation differences at the edge nodes are almost negligible. As to why do it - this question seems to be equivalent to why single-marking is needed which has been addressed above > C) Since single marking and dual marking don’t have compatibility, and solve the > almost the same problem, do we need to select and only keep one approach? We were trying to argue both at the last IETF and in draft-charny that it may be beneficial to allow both single and dual marking approaches. We were also arguing that the single-marking can be viewed as an intermediate step, leading to faster implementation and deployments. We argued that in environments where the tradeoffs associated with single marking are undesirable or unacceptable, the additional complexity of the dual marking may be necessary. We argued that with minor changes to the architecture it is possible to allow both, and argued how transitions from one to another can be achieved. Hope this is helpful, Anna >B. R. >Tina --0-815086369-1185205894=:44980 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit
Hello Tina,
 
Here are some answers to your questions, below.
 
>Hi all,
>Some thoughts came to my mind for draft-charny-pcn-single-marking-02.txt as below.
>1)      If the single marking scheme could solve all the problems that the dual marking
>  scheme could, only with very little tradeoffs? What are the biggest tradeoffs?
>
 
Well, I first want to emphasize that there is no clear view at the moment of which dual-marking approach to choose. Since  there are three substantially different proposals with substantially different properties, it is hard to answer your questions in a way that would apply to all dual-marking proposals.  In draft-charny-pcn-single-marking  we attempt to quantify performance tradeoffs with respect to the specific dual marking approach that was proposed in various draft-briscoe drafts prior to the PCN BOF.  Here are some (although not all) points from the single marking draft:
 
* single marking saves a codepoint and  allows core equipment to do only one metering/marking instead of two (important since it is done in the forwarding path). This point provides the key motivation.  A secondary motivation is that it can be implemented with a (single) token bucket which most of the equipment can support today.
* with single marking,  there is some degree of accuracy lost in the ability to deal with multi-path routing (the extent of comparative loss of accuracy differs for different dual-marking approaches)
* there are some tradeoffs in the flexibility of traffic engineering (see appropriate section in the draft-charny-single-marking) - this tradeoff will be the same in comparison with other dual-marking approaches
* there are some performance tradeoffs (discussed in the draft in comparison with *specific* dual marking approach).  Note that performance tradeoffs will be different for *different* dual-marking schemes currently on the table.
* it is unclear how to deal with anti-cheating end-to-end (something virtual-queue based approach previously discussed in several draft-briscoe drafts dealt with).  Note here that it is equally unclear how to deal with the anti-cheating issue with other dual marking approaches proposed in draft-babiarz and draft-westberg.
 
>2)      If single marking can solve all the problems, why not consider give up dual marking
>   approach?
 
see above tradeoffs.  One can be prepared to live with those tradeoffs in some environments but not in others.
 
>3)      Per draft-charny-pcn-single-marking-02, single marking approach can transit to
>   dual marking approach, why not directly design the dual marking directly, is there
>    reason to keep the single marking approach?
 
the key reasons to allow single marking would be to avoid requiring the complexity of two metering/marking in the forwarding path, saving codepoints where necessary, and to allow quick implementations
 
the key reason to eventually get to dual marking would be to allow eventually remove the restrictions/tradeoffs and get a more flexible scheme.   
 
>4)      A) How to mark the interim node? Single marking approach requires marking
>    Excess Traffic; dual marking approach does not require this, so they are impossible
> to be compatible with each other at this point.
 
I think this may be some misconception here.  First I note that dual marking as described in various draft-briscoe drafts requires both excess rate and virtual queue marking, so both require excess rate marking.  Other dual marking drafts require yet different versions of marking.  
Single marking draft argues that if a device implements only excess rate marking, then single marking approach can be used. If a device implements both excess rate marking and virtual-queue marking, then the specific version of dual marking (that of draft-briscoe...) can be used.  
 
single-marking draft does not address at the moment whether and how single marking can live with other dual-marking approaches. 
 
>May dual marking approach adopt only mark Excess Traffic method, whatever for
> Admission Rate or Termination Rate?
 
see above
 
>B) Egress and Ingress measurement basis and decision basis are different for single
> marking and dual marking approaches.
 
I note here that these decisions are also different for the multiple dual-marking approaches proposed :-).
 
>Via the configuration to let both working modes work together, both modes can co
>exist, but in fact they don’t have compatibility. Then why do we do it?
 
It is probably useful to note that the measurement functions and decisions are exactly the same for single-marking and the specific dual-marking draft proposed in the briscoe drafts.   So the implementation differences at the edge nodes are almost negligible.   As to why do it - this question seems to be equivalent to why single-marking is needed which has been addressed above
 
> C) Since single marking and dual marking don’t have compatibility, and solve the
>  almost the same problem, do we need to select and only keep one approach?
 
We were trying to argue both at the last IETF and in draft-charny that it may be beneficial to allow both single and dual marking approaches.  We were also arguing that the single-marking can be viewed as an intermediate step, leading to faster implementation and deployments.  We argued that in environments where the tradeoffs associated with single marking are undesirable or  unacceptable, the additional complexity of the dual marking may be necessary.  We argued that with minor changes to the architecture it is possible to allow both, and argued how transitions from one to another can be achieved.
 
Hope this is helpful,
 
Anna  
 
>B. R.
>Tina
--0-815086369-1185205894=:44980-- --===============0271353707== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0271353707==-- From pcn-bounces@ietf.org Mon Jul 23 12:11:06 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID0V0-0002JO-Ml; Mon, 23 Jul 2007 12:11:06 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ID0Uy-0002JI-R6 for pcn-confirm+ok@megatron.ietf.org; Mon, 23 Jul 2007 12:11:04 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID0Uy-0002JA-Gq for pcn@ietf.org; Mon, 23 Jul 2007 12:11:04 -0400 Received: from smtp5.smtp.bt.com ([217.32.164.139]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1ID0Uw-0002IJ-RT for pcn@ietf.org; Mon, 23 Jul 2007 12:11:04 -0400 Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp5.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 23 Jul 2007 17:09:20 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Mon, 23 Jul 2007 17:09:18 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185206956768; Mon, 23 Jul 2007 17:09:16 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.20]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6NG92JK011233; Mon, 23 Jul 2007 17:09:11 +0100 Message-Id: <5.2.1.1.2.20070722214056.02a64518@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Mon, 23 Jul 2007 17:07:18 +0100 To: "Georgios Karagiannis" From: Bob Briscoe Subject: RE: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt In-Reply-To: References: <004c01c7cb00$f65088a0$4c0d5982@dynamic.ewi.utwente.nl> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 23 Jul 2007 16:09:18.0083 (UTC) FILETIME=[D2767530:01C7CD43] X-Spam-Score: 0.0 (/) X-Scan-Signature: fba2f9e3429fd649356ecb87f3ef34a7 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Georgios, I've had a chance to read this one now - detailed review embedded... At 07:17 21/07/2007, Georgios Karagiannis wrote: >On 7/20/2007, "Georgios Karagiannis" wrote: > > >Hi Phil > > > >Thank you very much for the comments! > >Please see some remarks in line! > > > > > >> -----Original Message----- > >> From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] > >> Sent: donderdag 19 juli 2007 12:12 > >> To: khchan@nortel.com; pcn@ietf.org > >> Subject: RE: [PCN] Fwd: I-D > >> ACTION:draft-chan-pcn-encoding-comparison-00.txt > >> > >> Kwok, Georgios > >> > >> I read your draft. I have quite a lot of comments, but the > >> basic msg is that i think it's a suitable starting point for > >> a WG draft (towards the Charter milestone on this subject) - thanks. > > >Georgios: Thank you very much! I agree. > >> > >> 1. motivation & goals > >> this seems quite long for this draft, maybe the material is > >> more suitable elsewhere eg architecture draft? > > >Georgios: We will try to reduce the text! > >> > >> 2. PCN encoding .. in current PCN .. mechanisms & Appendix I > >> didn't find it useful to present the various proposed > >> mechanisms. The dependence between encoding & mechanism > >> (marking algo & PCN-boundary-node reaction) seem pretty weak > >> to me. In fact I think there's almost none, except in terms > >> of the number of codepoints that a proposed mechanism uses. > >> (Even this is not clear-cut; for example 'Affected marking' > >> could, I think, be easily added to those proposals that don't > >> mention it, or indeed removed from those proposals that do.) > >> > >> So can this section simply say that different proposals > >> require different numbers of encoding codepoints, and explain > >> this in a paragraph? > > >Georgios: Please note that this draft should be a survey. >Thus what we have done we have checked >the existing PCN like mechanisms and briefly described them. >In this way we could described which PCN features and which >encoding modes/states are supported(and thus are available) by these >mechanisms. >I would like to keep this section. I disagree. Like Phil, I think it would be useful to try to cut down drastically. The set of choices need to be laid out clearly, but I found there was much more text than was needed for clarity. Once/if this becomes an RFC, no-one is going to read it as the first or only thing they ever read about PCN. So you can refer to things like the architecture and get straight to the point in this one. - I agree with Phil that the marking algo text is fairly redundant - there also seem to be a lot of options that could just be killed off at birth (see later for specifics) because they don't work sufficiently to go forward. They just lead to a combinatorial explosion of text later, and waste IETF cycles discussing them. To cut down the choices, you need a criterion for a scheme getting mentioned in this draft. I suggest it should be that someone has already proposed it as part of a coherent PCN system, or that you (the authors) can propose an encoding that would be a better alternative to one already coherently proposed. So Fig 1 should have a ref column giving the ref that describes the option. Then you make a rule: No ref, no row. > >> > >> Incidentally, I found it a bit confusing to describe "not > >> congested" as a feature - at least, it doesn't seem a feature > >> in the way that adm ctrl & flow termination are features. In > >> fact, I found the discussion of 'features' in S3 & 4 a bit > >> misleading (stick with codepoints). > > >Georgios: I think that a better term would be PCN encoding features, >instead >of PCN features. >In this case "not congested" admission control and flow termination can >be >seen to belong in the same category. What we actually wanted to do is to >emphaisze and differentiate between >PCN encoding features and encoding modes/states. >This is because one PCN encoding feature can be accomplished using more >than >one encoding modes/states > > >> > >> I think phrases like "requirement for xx marking" could be > >> better expressed (are they reqts? It's a choice about how > >> many codepoints we > >> have) > >Georgios: Do you have any suggestion on naming? > > >> > >> 3. survey of encoding > >> the table is very useful. I agree - very useful format. Another suggestion: Could a lot of the following text also be tabulated and the longhand text removed. > >> > >> Would it be better grouping the options in terms of the > >> number of codepoints required? Ie if the mechanism needs 3 > >> codepoints here are your options; if it needs 4 here they are etc. > >Georgios: I am not sure if this will encounter what we wanted to do. >Please note that we intended to also include the PCN encoding features >that are supported by each option. Please reconsider your response. Phil's talking sense. The top level question is how many states do we want to encode. Then, the second level question is how do we encode them. > >> Should there be an option similar to option 9, but with PCN dscp? > > >> Should there be an option similar to option 10/11, but with 2 DSCPs? > >> (that single marking mechanism could use) > >Georgios: I do not understand this remarks. Maybe we can discuss them in >Chicago I'm trying to unpick how Georgios (and Kwok) are thinking. I understand Phil's comments perfectly, so there must be some misunderstanding here. > >> Should there be an option similar to option 9, but with PCN dscp? In fact, I don't understand why any of 5-9 are in the table at all as they don't distinguish PCN from non-PCN (see my response "Yes, of course" to Kwok's original question asking whether this was a key requirement). Here's quotes from options 5-9: =========================================================================== 5: "The use of Not-ECT will separate PCN traffic from non[e] PCN traffic with the big exception of [for] ECN traffic." 6: "Encoding Option 6 suffers the same issue as Encoding Option 5 on ability to separate traffic and indications between PCN and ECN traffic." 7: "But this still suffers the same problems as Encoding Options 5 & 6" 8: "But then it cannot distinguish PCN/ECN capable traffic from non[e] PCN/ECN capable traffic, and still suffers the same issues as Encoding Options 5, 6 and 7." 9: "But it still suffers the lack of ability to be distinguished from RFC3168 ECN traffic." =========================================================================== So, all of options 5-9 should be killed. No-one has proposed them anyway and they don't work. However, two of the ECN field combinations in them (6 & 9) should be "reincarnated": two new ECN+DS combinations should be created exactly like 6 & 9 except with 'PCN' in the DSCP column. > >> Should there be an option similar to option 10/11, but with 2 DSCPs? > >> (that single marking mechanism could use) > >Georgios: I do not understand this remarks. Maybe we can discuss them in >Chicago I believe Phil was trying to say what I've tabulated below - does this help? The numbers in the body are for the different DSCPs needed (ie 0 = DSCP0, 1 = DSCP1, 2 = DSCP2 etc). Encodg Option 10 11 12 13 Not congested 0 0 0 0 Admisn marked 1 - 1 1 Termin marked 2 1 1 1 ECMP affected 3 2 - 2 12 is Anna's single marking scheme using just DSCPs rather than DSCP + ECN 13 is as 12, but using another DSCP for ECMP affected. AM & TM only need one DSCP, because Anna's single marking proposal requires one less state (because the egress calculates both admission and termination information from one marking state). > >> > >> Don't understand NDS-CE >Georgios: will clarify! I think this is a (unsuccesful?) attempt to invent an ECN-only scheme that makes sense (as I've said, I don't think any ECN-only scheme will ever make sense). S.3.1.2 (Option 2) Why is additional control and separation of AM & TM to provide edge nodes with added capabilites out of scope? Sounds like it should be very much in scope to me, but I don't know what is referred to here. > >> > >> There are many typos where 'none' should be 'non' (non PCN capable > >> transport) > >Georgios: agree it is a typo! > > >> > >> In option 2 (& 6, 7) what does ECT(A) & ECT(T) mean? (I > >> remember back in Briscoe-cl-phb we looked at an option where > >> PCN marking was signalled by a *change* of codepoint, maybe > >> it's referring to this idea? ie Adm marking is 01 -> 00 & > >> Termination marking is 10 -> 11.) > >Georgios: yes this is taken from Briscoe-cl-phb draft. It was one of Joe's ideas documented in the cl-phb draft > >> > >> S3.4 use of IPFIX. I know you included this section because > >> the charter seems to suggest it - but I must admit to finding > >> it out of place in this doc. > >Georgios: I think it is good to include an option that uses for encoding >and transport a different channel than the data path. I'd rather the arch doc explained why out-of-band signalling needs more complexity to authenticate it than in-band and so out of scope of PCN, then we could just delete it from this doc. That doesn't mean we're stopping people doing OOB signalling or saying they shouldn't, it's just not relevant to PCN if they do. > >> > >> > >> 4. comparison > >> I wonder if it's worth starting this section with all the > >> points that relate to how many codepoints there should be, > >> and later handle the more detailed aspects. I strongly urge the authors to follow Phil's advice here. > >> > >> Aspects of the first part: > >> - will there be non-PCN traffic in the DS network? (surely a > >> clear yes, ie we need a separate PCN DSCP(s)) > >> - MPLS (which has limited codepoint space) [discussed in > >> earlier Briscoe-cl-architecture drafts - could adapt text from there] draft-ietf-tsvwg-ecn-mpls is going to WG last call. Pls read it - it has a lot about how PCN marking might be encoded into MPLS (without pre-judging this PCN w-g encoding debate). > >> - whether 'affected marking' is needed /useful [no consensus > >> at present > >> - based on your text in S2] I agree with Phil. There's been little/no debate on whether dealing with ECMP is best done by a) encoding in packet markings or b) by finding some way to include a path identifier in packets. I can give lots of reasons why ECMP affected marking might not work well. [Here's one... Imagine a scenario with a crowd converging on an egress boundary node over different ECMP paths. Links on more than 1 (e.g. 2) of the paths might start AM, with one marking at a much lower level than the other. Both paths would start affected marking. But affected marking only helps if just one path is affected, or of all affected paths have the same marking level. Termination marking would suffer exactly the same problem.] An alternative solution might be to find a way for the egress to distinguish measurements from each separate ECMP path, by unpicking the path identifiers that ECMP is using to separate the paths in the first place. This isn't the place to discuss the merits of solutions to ECMP (not this draft, and not this mail thread). So I suggest for now this draft just documents the possible need for an ECMP codepoint, and in the comparison notes those encodings that would or would not have space for it. > >> - whether adm ctrl & termination ctrl can be driven by the > >> same encoding > >Georgios: Check and discuss the above issues in Chicago I agree this should be considered - Anna's single marking is the ref here (I'm not saying I agree, just that it should be considered). > >> > >> - perhaps that adm ctrl & flow termination mechanisms are not > >> required to both be deployed (just one could be) > >> - etc > >Georgios: yes, but many scenarios require both ... Therefore is good to >emphasize which of them support both and which not! > >> > >> this would actually shorten some of the draft, eg S4.2.3 > >> could basically disappear. > >> > >> > >> some of the ECN nonce discussion I found hard to follow > >> 4.1.5. explain what 'alternate ECN semantics' means I disagree with Phil here. See my comment earlier about keeping this I-D short by referring out. I'd rather you (Georgios & Kwok) didn't repeat RFC4774 here in the interests of brevity. In S4.2.4 on distinguishing PCN from non-PCN, I agree with your second option in the last para of the section: ie. don't have a special DSCP for Not-PCN-Capable, because this role is fulfilled by all the DSCPs that aren't PCN DSCPs. > >> S4.2.5 I didn't follow what cases you were distinguishing. I don't agree with (or don't understand) this statement in the draft: "There are two issues indicated here. First: the ability to distinguish PCN traffic from non[e] PCN traffic. Second: the ability to distinguish PCN from ECN traffic." I think a lot of these misunderstandings would be solved if you defined what you think you mean (in terms of scheduling behaviour as well as marking behaviour) by - PCN traffic - non-PCN traffic - ECN traffic See point below about Fred Baker's EF-ADMIT draft and the list discussion started by Kwok on this. > >> there are a couple of issues at the high level: whether ECN > >> nonce is useful with PCN; backwards compatibility of PCN with > >> ECN nonce, The ECN nonce only works if the receiver processes the packets in order. In this case, that would mean the PCN-ingress-node would have to add sequence numbers to all the packets in the aggregate and the PCN-egress-node would have to bring the aggregate of packets back into order to check the none sum. Even then, the ECN nonce only provides protection once every feedback message. That was useful with frequencies of feedback much higher than marking frequencies (like the feedback every other packet you get with TCP). PCN envisages feedback on signalling timescales (at minimum every few thousand packets). So even if there was reliable ordering, a binary nonce would only allow the PCN-ingress-node to detect a change to the last packet marking before each feedback signal. And, of course, it doesn't allow the network to check if the PCN-ingress-node is cheating. See draft-briscoe-re-pcn-border-cheat-00.txt for my suggested encoding to deal with a wide range of anti-cheating cases. But other encodings are possible - I'm not religious about this. I will write-up the constraints I believe we have on the encoding. In a single trust domain scenario, we don't need anti-cheating codepoints. Anti-cheating falls into the category of things to consider for when we move to a multi-domain scenario. Having done that exercise I can assure you that a codepoint for the ECN nonce is not needed in PCN scenarios. >eg in an 'unusual situation' such as the PCN pkt > >> encounters an 'old' (ECN) router. > >Georgios: we have to update and enlarge section 4.2.5 The appendix of cl-phb on all the coding choices known at that time contains excellent (and brief) text you can use for this draft. It already included most of the workable choices you've covered, except it just needed discussion of the extra codepoint that might be needed for ECMP Affected (and one or two new ideas added from the list since, such as Anna's single marking). Of course, it included the RMD/LC Diffserv only encoding. In writing CL-PHB, a lot of time was spent taking combinations that were effectively equivalent but just with arbitrarily different choices of codepoints, and working out which ones were more robust to config errors (alt ECN semantics discussion) or the presence of unexpected legacy routers (S.4.1.6 of your I-D) etc. All that work was documented succinctly, and could be easily copied and pasted into this draft. A large amount of all the authors' time (including yours) had been spent narrowing down the coding choices to those that represented the different trade-offs each person thought important, so that the list could discuss this. > >> > >> could mention the discussion we had about the charter > >> assuming a single domain, but we're going to keep strongly in > >> mind that want it to work multi-domain in future. This seems > >> esp important when it comes to encoding - after all, if it's > >> just your domain you can do what you like. > >> The multi-domain consideration has several impacts I think: > >> * makes standardising encoding important > >> * need to consider rfc4774 [because the issues it raises are > >> probably more significant in the inter-domain case than in > >> one domain under one operator's control] > >georgios: Thus you propose to include the multi-domain support as an >additional criterion > > >> * need to consider limitations about encoding from > >> draft-briscoe-re-pcn-border-cheat-00.txt [proposed mechanism > >> for making PCN work inter-domain] > >Georgios: We will discuss this in CHicago Yes, the WG chairs have already said we should take multidomain into account when considering encodings, but they need to re-affirm how deeply that means we need to go. In section 6, I suggest all the paras except the last should be moved to an architecture doc - they aren't security issues about the encoding, but just general architectural security issues. The last para needs expanding to address the above issues. Concerning the first para (MLPP), there is an impact on encoding but its orthogonal to PCN encoding and dealt with already in MLPP documents. Other constraints should be mentioned: 1. Architectural intent of different fields (DS & ECN) ------------------------------------------------------ There was a long discussion on the tsvwg mailing list way back about this (between you & I) that could be summarised in your I-D. 2. PCN encoding encapsulation and decapsulation: ----------------------------------------------- Within a PCN domain there may be arbitrary encapsulations of the outer IP header in further outer headers, either as packets cross link layers that support PCN (e.g. see draft-ietf-ecn-mpls-01.txt) or because of IP in IP tunnelling (e.g. between two sites of an enterprise that want IPsec between them as well as PCN reservations). We cannot and should not constrain all tunnelling to be outside a PCN domain. An ideal PCN encoding would allow any tunnel or link encapsulation implementation to just encapsulate packets with the same rules for processing the ECN and DS fields as non-PCN packets. Otherwise, all tunnel and link technology vendors have to know about PCN as an exception. See "Layered Encapsulation of Congestion Notification" (I posted a note about this to the PCN list in Jun 07). This relates to the point about architectural intent of the fields: tunnels will treat the fields differently depending on their architectural intent. The DS field is processed differently by tunnels than the ECN field, because the ECN field has a special codepoint (Not-ECT) and a ranking of codepoints (CE>ECT) that makes some transitions illegal. PCN is similar. It can have a multi-level ranking (CE>TM>AM) and a Not-PCN state (excuse my abbreviated terminology). Tunnels treat DS differently, just copying it. 3. Distinguishing admission controlled from non-admission controlled -------------------------------------------------------------------- The draft should refer to (and take accont of) Fred Baker's "DSCPs for Capacity Admitted Traffic" with its suggestions on how to distinguish between admission controlled EF and non-admission controlled. It should also take account of the discussion on this subject started by Kwok recently. Nits ---- Section 1: ECN in RFC3168 was not only designed for TCP. It was designed into IP for all transports but the TCP-ECN spec was defined in the same doc, at the request of the Transport ADs at the time. Section 2: 3 occurrences of wording that (confusingly) implies PCN is already deployed. "PCN based mechanisms are used..." "the current available PCN based algorithms" "the current PCN detection" S.2.1: Your draft implies CL-PHB is one proposal, whereas it was a comparison of 5 different proposals. As editor, I know Phil was very careful not to recommend one above the others (the one used in the body of the text was "just to be concrete"). So there's no such thing as "in CL-PHB a solution has been developed" or "the main encoding scheme used in CL-PHB". Figure 1 -> Table 1 S.3 Surely there's no difference between Not-CE (Option 8) and ECT (Option 9)? Hope this all helps. Bob >Best regards, >Georgios > > >> > >> best wishes - see you in Chicago! > >> phil > >> > >> > -----Original Message----- > >> > From: Kwok-Ho Chan [mailto:khchan@nortel.com] > >> > Sent: 05 July 2007 21:13 > >> > To: pcn@ietf.org > >> > Subject: [PCN] Fwd: I-D > >> ACTION:draft-chan-pcn-encoding-comparison-00.txt > >> > > >> > PCN WG: > >> > I would like to bring to your attention the availability of the > >> > initial version of PCN Encoding Comparison draft. > >> > > >> > Please review and comment. And discuss on the PCN list. > >> > > >> > Thank you very much and looking forward to your comments. > >> > -- Kwok and Georgios -- > >> > > >> > >To: i-d-announce@ietf.org > >> > >Cc: > >> > >From: Internet-Drafts@ietf.org > >> > >Date: Thu, 05 Jul 2007 13:15:02 -0400 > >> > >X-Scan-Signature: 14582b0692e7f70ce7111d04db3781c8 > >> > >Subject: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt > >> > >X-BeenThere: i-d-announce@ietf.org > >> > >X-Mailman-Version: 2.1.5 > >> > >Reply-To: internet-drafts@ietf.org > >> > >List-Id: i-d-announce.ietf.org > >> > >List-Unsubscribe: > >> , > >> > > > >> > >List-Archive: > >> > >List-Post: > >> > >List-Help: > >> > >List-Subscribe: > >> , > >> > > > >> > >X-Spam-Score: 2.3 > >> > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on > >> > ecarhea1.nortel.com > >> > >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, > >> > > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=1 > >> > >X-DNSBL-Score: -50 > >> > >X-DNSBL-Servers: bl.nortel.com > >> > >X-SMTP-HELO: megatron.ietf.org > >> > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org > >> > >X-SMTP-RCPT-TO: > >> > > >> >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharr > >> ath@nortel > >> .c > >> > > >> om,babiarz@nortel.com,aceler@nortel.com,simmonds@nortel.com,hu > >> iwc@nortel > >> .c > >> > > >> om,amuhanna@nortel.com,gparsons@nortel.com,mchen@nortel.com,kh > >> chan@norte > >> l. > >> > com > >> > >X-SMTP-PEER-INFO: megatron.ietf.ORG [156.154.16.145] > >> > >X-SMTP-REASON: PASSED > >> > >X-SMTP-ID: 1183656101.14019435 > >> > >X-OriginalArrivalTime: 05 Jul 2007 17:21:42.0459 (UTC) > >> > >FILETIME=[F47A20B0:01C7BF28] > >> > > > >> > >A New Internet-Draft is available from the on-line Internet-Drafts > >> > >directories. > >> > > > >> > > > >> > > Title : Pre-Congestion Notification Encoding > >> > Comparison > >> > > Author(s) : K. Chan, G. Karagiannis > >> > > Filename : > >> draft-chan-pcn-encoding-comparison-00.txt > >> > > Pages : 36 > >> > > Date : 2007-7-5 > >> > > > >> > > DiffServ mechanisms have been developed to support Quality of > >> Service > >> > > (QoS). However, the level of assurance that can be > >> provided with > >> > > DiffServ without substantial over-provisioning is > >> limited. Pre- > >> > > Congestion Notification (PCN) investigates the use of per-flow > >> > > admission control to provide the required service > >> guarantees for > >> the > >> > > admitted traffic. While admission control will protect the QoS > >> under > >> > > normal operating conditions, an additional flow termination > >> > > mechanism is necessary in the times of heavy congestion (e.g. > >> caused > >> > by route > >> > > changes due to link or node failure). > >> > > > >> > > Encoding and their transport are required to carry the > >> congestion > >> and > >> > > pre-congestion information from the congestion and > >> pre-congestion > >> > > points to the decision points. This document provides a survey > >> of > >> > > several encoding methods, using comparisons amongst > >> them as a way > >> to > >> > > explain their strengths and weaknesses. > >> > > > >> > > > >> > > > >> > >A URL for this Internet-Draft is: > >> > > >> >http://www.ietf.org/internet-drafts/draft-chan-pcn-encoding-c > >> omparison- > >> > 00.txt > >> > > > >> > >To remove yourself from the I-D Announcement list, send a > >> message to > >> > >i-d-announce-request@ietf.org with the word unsubscribe in the body > >> of > >> > >the message. > >> > >You can also visit > >> https://www1.ietf.org/mailman/listinfo/I-D-announce > >> > >to change your subscription settings. > >> > > > >> > >Internet-Drafts are also available by anonymous FTP. Login > >> with the > >> > >username "anonymous" and a password of your e-mail address. After > >> > >logging in, type "cd internet-drafts" and then "get > >> > >draft-chan-pcn-encoding-comparison-00.txt". > >> > > > >> > >A list of Internet-Drafts directories can be found in > >> > >http://www.ietf.org/shadow.html or > >> > >ftp://ftp.ietf.org/ietf/1shadow-sites.txt > >> > > > >> > >Internet-Drafts can also be obtained by e-mail. > >> > > > >> > >Send a message to: > >> > > mailserv@ietf.org. > >> > >In the body type: > >> > > "FILE /internet-drafts/draft-chan-pcn-encoding-comparison- > >> > 00.txt". > >> > > > >> > >NOTE: The mail server at ietf.org can return the document in > >> > > MIME-encoded form by using the "mpack" utility. > >> To use this > >> > > feature, insert the command "ENCODING mime" before the > >> "FILE" > >> > > command. To decode the response(s), you will > >> need "munpack" > >> or > >> > > a MIME-compliant mail reader. Different > >> MIME-compliant mail > >> > readers > >> > > exhibit different behavior, especially when dealing with > >> > > "multipart" MIME messages (i.e. documents which have been > >> split > >> > > up into multiple messages), so check your local > >> documentation on > >> > > how to manipulate these messages. > >> > > > >> > >Below is the data which will enable a MIME compliant mail reader > >> > >implementation to automatically retrieve the ASCII version of the > >> > >Internet-Draft. > >> > > > >> > >Content-Type: text/plain > >> > >Content-ID: <2007-7-5125842.I-D@ietf.org> > >> > > > >> > >ENCODING mime > >> > >FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt > >> > > > >> > > > >> > > >> >> > omparison- > >> > 00.txt> > >> > >_______________________________________________ > >> > >I-D-Announce mailing list > >> > >I-D-Announce@ietf.org > >> > >https://www1.ietf.org/mailman/listinfo/i-d-announce > >> > > >> > > >> > > >> > > >> > _______________________________________________ > >> > PCN mailing list > >> > PCN@ietf.org > >> > https://www1.ietf.org/mailman/listinfo/pcn > >> > >> > >> _______________________________________________ > >> PCN mailing list > >> PCN@ietf.org > >> https://www1.ietf.org/mailman/listinfo/pcn > >> > > > > >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www1.ietf.org/mailman/listinfo/pcn ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 23 12:35:02 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID0s9-0006fI-NQ; Mon, 23 Jul 2007 12:35:01 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ID0s8-0006f7-3r for pcn-confirm+ok@megatron.ietf.org; Mon, 23 Jul 2007 12:35:00 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID0s7-0006ez-Q8 for pcn@ietf.org; Mon, 23 Jul 2007 12:34:59 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1ID0s6-0002sR-BV for pcn@ietf.org; Mon, 23 Jul 2007 12:34:59 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 23 Jul 2007 17:00:51 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt Date: Mon, 23 Jul 2007 17:00:50 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA50132C11B@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt Thread-Index: AcfLXs5wgnwnxwpbQ5iYnPmqUyss6QB4Zssm References: From: To: , X-OriginalArrivalTime: 23 Jul 2007 16:00:51.0216 (UTC) FILETIME=[A458B100:01C7CD42] X-Spam-Score: 0.0 (/) X-Scan-Signature: 32604d42645517c44d778f1d111b40a6 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org in-line thanks phil ________________________________ From: Georgios Karagiannis [mailto:karagian@cs.utwente.nl] Sent: Sat 21/07/2007 07:17 To: pcn@ietf.org; Eardley,PL,Philip,CXR9 R Cc: karagian@cs.utwente.nl Subject: RE: [PCN] Fwd: I-D = ACTION:draft-chan-pcn-encoding-comparison-00.txt On 7/20/2007, "Georgios Karagiannis" wrote: >Hi Phil > >Thank you very much for the comments! >Please see some remarks in line! > > >> -----Original Message----- >> From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] >> Sent: donderdag 19 juli 2007 12:12 >> To: khchan@nortel.com; pcn@ietf.org >> Subject: RE: [PCN] Fwd: I-D >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> Kwok, Georgios >> >> I read your draft. I have quite a lot of comments, but the >> basic msg is that i think it's a suitable starting point for >> a WG draft (towards the Charter milestone on this subject) - thanks. > Georgios: Thank you very much! >> >> 1. motivation & goals >> this seems quite long for this draft, maybe the material is >> more suitable elsewhere eg architecture draft? > Georgios: We will try to reduce the text! >> >> 2. PCN encoding .. in current PCN .. mechanisms & Appendix I >> didn't find it useful to present the various proposed >> mechanisms. The dependence between encoding & mechanism >> (marking algo & PCN-boundary-node reaction) seem pretty weak >> to me. In fact I think there's almost none, except in terms >> of the number of codepoints that a proposed mechanism uses. >> (Even this is not clear-cut; for example 'Affected marking' >> could, I think, be easily added to those proposals that don't >> mention it, or indeed removed from those proposals that do.) >> >> So can this section simply say that different proposals >> require different numbers of encoding codepoints, and explain >> this in a paragraph? > Georgios: Please note that this draft should be a survey. Thus what we have done we have checked the existing PCN like mechanisms and briefly described them. In this way we could described which PCN features and which encoding modes/states are supported(and thus are available) by these mechanisms. I would like to keep this section. [phil] well it's supposed to be a survey of encoding, not a survey of = algorithms. i think the section degrades from the draft. >> >> Incidentally, I found it a bit confusing to describe "not >> congested" as a feature - at least, it doesn't seem a feature >> in the way that adm ctrl & flow termination are features. In >> fact, I found the discussion of 'features' in S3 & 4 a bit >> misleading (stick with codepoints). > Georgios: I think that a better term would be PCN encoding features, instead of PCN features. In this case "not congested" admission control and flow termination can be seen to belong in the same category. What we actually wanted to do is to emphaisze and differentiate between PCN encoding features and encoding modes/states. This is because one PCN encoding feature can be accomplished using more than one encoding modes/states [phil] sorry, what is an 'encoding feature'? why are "not congested" and = "termination control" both 'encoding features'. i must admit i'm still = confused. although your final sentence is true, this is most relevant = for drafts about teh reaction of PCN-boundary-nodes - it doesnt really = have much to do with encoding choices. >> >> I think phrases like "requirement for xx marking" could be >> better expressed (are they reqts? It's a choice about how >> many codepoints we >> have) Georgios: Do you have any suggestion on naming? >> >> 3. survey of encoding >> the table is very useful. >> >> Would it be better grouping the options in terms of the >> number of codepoints required? Ie if the mechanism needs 3 >> codepoints here are your options; if it needs 4 here they are etc. Georgios: I am not sure if this will encounter what we wanted to do. Please note that we intended to also include the PCN encoding features that are supported by each option. [phil] the functionality that can be supported by the end systems and = the encoding choice are fairly independent things. on reflection, i = think my original comment here is the most critical one. it seems the = most fundamental decision for this draft is how many PCN codepoints are = needed. >> Should there be an option similar to option 9, but with PCN dscp? >> Should there be an option similar to option 10/11, but with 2 DSCPs? >> (that single marking mechanism could use) Georgios: I do not understand this remarks. Maybe we can discuss them in Chicago [phil] sure.=20 >> >> Don't understand NDS-CE Georgios: will clarify! >> >> There are many typos where 'none' should be 'non' (non PCN capable >> transport) Georgios: agree it is a typo! >> >> In option 2 (& 6, 7) what does ECT(A) & ECT(T) mean? (I >> remember back in Briscoe-cl-phb we looked at an option where >> PCN marking was signalled by a *change* of codepoint, maybe >> it's referring to this idea? ie Adm marking is 01 -> 00 & >> Termination marking is 10 -> 11.) Georgios: yes this is taken from Briscoe-cl-phb draft. [phil] ok. just to point out then that you have misunderstood it in your = draft. >> >> S3.4 use of IPFIX. I know you included this section because >> the charter seems to suggest it - but I must admit to finding >> it out of place in this doc. Georgios: I think it is good to include an option that uses for encoding and transport a different channel than the data path. [phil] thinking more about this, i think probably the Architecture draft = should discuss this. personally i think the arch doc should make more = choices than it does at the moment - so we should state (explain) in = that doc that PCn will only look at data pkt marking mechanisms, and not = at explicit signalling of congestion (from a pre-congested node to the = egress] >> >> >> 4. comparison >> I wonder if it's worth starting this section with all the >> points that relate to how many codepoints there should be, >> and later handle the more detailed aspects. >> >> Aspects of the first part: >> - will there be non-PCN traffic in the DS network? (surely a >> clear yes, ie we need a separate PCN DSCP(s)) >> - MPLS (which has limited codepoint space) [discussed in >> earlier Briscoe-cl-architecture drafts - could adapt text from there] >> - whether 'affected marking' is needed /useful [no consensus >> at present >> - based on your text in S2] >> - whether adm ctrl & termination ctrl can be driven by the >> same encoding Georgios: Check and discuss the above issues in Chicago >> >> - perhaps that adm ctrl & flow termination mechanisms are not >> required to both be deployed (just one could be) >> - etc Georgios: yes, but many scenarios require both ... Therefore is good to emphasize which of them support both and which not! >> >> this would actually shorten some of the draft, eg S4.2.3 >> could basically disappear. >> >> >> some of the ECN nonce discussion I found hard to follow >> 4.1.5. explain what 'alternate ECN semantics' means >> S4.2.5 I didn't follow what cases you were distinguishing. >> there are a couple of issues at the high level: whether ECN >> nonce is useful with PCN; backwards compatibility of PCN with >> ECN nonce, eg in an 'unusual situation' such as the PCN pkt >> encounters an 'old' (ECN) router. Georgios: we have to update and enlarge section 4.2.5 [phil] also the drfqat-briscoe-cl-phb has an appendix that compares 4 or = 5 different encoding options, including issues related to what's now = rfc4774. think we need to re-visit that and expand/change as needed? >> >> could mention the discussion we had about the charter >> assuming a single domain, but we're going to keep strongly in >> mind that want it to work multi-domain in future. This seems >> esp important when it comes to encoding - after all, if it's >> just your domain you can do what you like. >> The multi-domain consideration has several impacts I think: >> * makes standardising encoding important >> * need to consider rfc4774 [because the issues it raises are >> probably more significant in the inter-domain case than in >> one domain under one operator's control] georgios: Thus you propose to include the multi-domain support as an additional criterion [phil] yes (well it's not me proposing it - what was agreed in BoF) >> * need to consider limitations about encoding from >> draft-briscoe-re-pcn-border-cheat-00.txt [proposed mechanism >> for making PCN work inter-domain] Georgios: We will discuss this in CHicago Best regards, Georgios >> >> best wishes - see you in Chicago! >> phil >> >> > -----Original Message----- >> > From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> > Sent: 05 July 2007 21:13 >> > To: pcn@ietf.org >> > Subject: [PCN] Fwd: I-D >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> > >> > PCN WG: >> > I would like to bring to your attention the availability of the >> > initial version of PCN Encoding Comparison draft. >> > >> > Please review and comment. And discuss on the PCN list. >> > >> > Thank you very much and looking forward to your comments. >> > -- Kwok and Georgios -- >> > >> > >To: i-d-announce@ietf.org >> > >Cc: >> > >From: Internet-Drafts@ietf.org >> > >Date: Thu, 05 Jul 2007 13:15:02 -0400 >> > >X-Scan-Signature: 14582b0692e7f70ce7111d04db3781c8 >> > >Subject: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt >> > >X-BeenThere: i-d-announce@ietf.org >> > >X-Mailman-Version: 2.1.5 >> > >Reply-To: internet-drafts@ietf.org >> > >List-Id: i-d-announce.ietf.org >> > >List-Unsubscribe: >> , >> > > >> > >List-Archive: >> > >List-Post: >> > >List-Help: >> > >List-Subscribe: >> , >> > > >> > >X-Spam-Score: 2.3 >> > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >> > ecarhea1.nortel.com >> > >X-Spam-Tests: FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, >> > > NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D1 >> > >X-DNSBL-Score: -50 >> > >X-DNSBL-Servers: bl.nortel.com >> > >X-SMTP-HELO: megatron.ietf.org >> > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >> > >X-SMTP-RCPT-TO: >> > >> >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharr >> ath@nortel >> .c >> > >> om,babiarz@nortel.com,aceler@nortel.com,simmonds@nortel.com,hu >> iwc@nortel >> .c >> > >> om,amuhanna@nortel.com,gparsons@nortel.com,mchen@nortel.com,kh >> chan@norte >> l. >> > com >> > >X-SMTP-PEER-INFO: megatron.ietf.ORG [156.154.16.145] >> > >X-SMTP-REASON: PASSED >> > >X-SMTP-ID: 1183656101.14019435 >> > >X-OriginalArrivalTime: 05 Jul 2007 17:21:42.0459 (UTC) >> > >FILETIME=3D[F47A20B0:01C7BF28] >> > > >> > >A New Internet-Draft is available from the on-line Internet-Drafts >> > >directories. >> > > >> > > >> > > Title : Pre-Congestion Notification Encoding >> > Comparison >> > > Author(s) : K. Chan, G. Karagiannis >> > > Filename : >> draft-chan-pcn-encoding-comparison-00.txt >> > > Pages : 36 >> > > Date : 2007-7-5 >> > > >> > > DiffServ mechanisms have been developed to support Quality of >> Service >> > > (QoS). However, the level of assurance that can be >> provided with >> > > DiffServ without substantial over-provisioning is >> limited. Pre- >> > > Congestion Notification (PCN) investigates the use of per-flow >> > > admission control to provide the required service >> guarantees for >> the >> > > admitted traffic. While admission control will protect the = QoS >> under >> > > normal operating conditions, an additional flow termination >> > > mechanism is necessary in the times of heavy congestion (e.g. >> caused >> > by route >> > > changes due to link or node failure). >> > > >> > > Encoding and their transport are required to carry the >> congestion >> and >> > > pre-congestion information from the congestion and >> pre-congestion >> > > points to the decision points. This document provides a = survey >> of >> > > several encoding methods, using comparisons amongst >> them as a way >> to >> > > explain their strengths and weaknesses. >> > > >> > > >> > > >> > >A URL for this Internet-Draft is: >> > >> >http://www.ietf.org/internet-drafts/draft-chan-pcn-encoding-c >> omparison- >> > 00.txt >> > > >> > >To remove yourself from the I-D Announcement list, send a >> message to >> > >i-d-announce-request@ietf.org with the word unsubscribe in the = body >> of >> > >the message. >> > >You can also visit >> https://www1.ietf.org/mailman/listinfo/I-D-announce >> > >to change your subscription settings. >> > > >> > >Internet-Drafts are also available by anonymous FTP. Login >> with the >> > >username "anonymous" and a password of your e-mail address. After >> > >logging in, type "cd internet-drafts" and then "get >> > >draft-chan-pcn-encoding-comparison-00.txt". >> > > >> > >A list of Internet-Drafts directories can be found in >> > >http://www.ietf.org/shadow.html or >> > >ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> > > >> > >Internet-Drafts can also be obtained by e-mail. >> > > >> > >Send a message to: >> > > mailserv@ietf.org. >> > >In the body type: >> > > "FILE = /internet-drafts/draft-chan-pcn-encoding-comparison- >> > 00.txt". >> > > >> > >NOTE: The mail server at ietf.org can return the document in >> > > MIME-encoded form by using the "mpack" utility. >> To use this >> > > feature, insert the command "ENCODING mime" before the >> "FILE" >> > > command. To decode the response(s), you will >> need "munpack" >> or >> > > a MIME-compliant mail reader. Different >> MIME-compliant mail >> > readers >> > > exhibit different behavior, especially when dealing with >> > > "multipart" MIME messages (i.e. documents which have been >> split >> > > up into multiple messages), so check your local >> documentation on >> > > how to manipulate these messages. >> > > >> > >Below is the data which will enable a MIME compliant mail reader >> > >implementation to automatically retrieve the ASCII version of the >> > >Internet-Draft. >> > > >> > >Content-Type: text/plain >> > >Content-ID: <2007-7-5125842.I-D@ietf.org> >> > > >> > >ENCODING mime >> > >FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt >> > > >> > > >> > >> >> omparison- >> > 00.txt> >> > >_______________________________________________ >> > >I-D-Announce mailing list >> > >I-D-Announce@ietf.org >> > >https://www1.ietf.org/mailman/listinfo/i-d-announce >> > >> > >> > >> > >> > _______________________________________________ >> > PCN mailing list >> > PCN@ietf.org >> > https://www1.ietf.org/mailman/listinfo/pcn >> >> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 23 13:19:43 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID1ZO-0003F2-SX; Mon, 23 Jul 2007 13:19:42 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ID1ZN-0003AV-Lr for pcn-confirm+ok@megatron.ietf.org; Mon, 23 Jul 2007 13:19:41 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID1ZN-00037b-72 for pcn@ietf.org; Mon, 23 Jul 2007 13:19:41 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1ID1ZK-0003DH-If for pcn@ietf.org; Mon, 23 Jul 2007 13:19:41 -0400 Received: from zrtphxm1.corp.nortel.com (zrtphxm1.corp.nortel.com [47.140.202.50]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6NHJIm07604; Mon, 23 Jul 2007 17:19:18 GMT Received: from KCHAN-2K3.nortel.com ([47.102.179.11] RDNS failed) by zrtphxm1.corp.nortel.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 23 Jul 2007 13:19:15 -0400 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Mon, 23 Jul 2007 13:19:14 -0400 To: Bob Briscoe From: "Kwok-Ho Chan" Subject: RE: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt In-Reply-To: <5.2.1.1.2.20070722214056.02a64518@pop3.jungle.bt.co.uk> References: <004c01c7cb00$f65088a0$4c0d5982@dynamic.ewi.utwente.nl> <5.2.1.1.2.20070722214056.02a64518@pop3.jungle.bt.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Message-ID: X-OriginalArrivalTime: 23 Jul 2007 17:19:15.0651 (UTC) FILETIME=[98688130:01C7CD4D] X-Spam-Score: 0.0 (/) X-Scan-Signature: e535e8fdae689580ce57283401d548ee Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org My personal opinion on the direction of the draft is: 1. Simplify the draft by focusing on Encoding and not Algorithm. I actually have the same opinion and are trying to de-emphasize the Algorithm parts of the draft by moving them to the appendix. I have also removed the more detailed descriptions of 3sm algorithm from the appendix (the one that I can remove without making someone feel bad that their algorithm is not represented in this draft). (I wanted people to read the short 3sm draft instead of the summary. :) 2. I wanted to make the Encoding comparison (and choices) be as independent as possible from the Algorithm comparison (and choices). We have wrote the latest Algorithm drafts without calling for specific Encoding (the bits), just indicating the "states" the Algorithm requires/uses to carry the information output of the Algorithms. Hence we should try to continue to achieve the "independence" goal of the draft. 3. There may be cases where special considerations are applicable wrt possible additional "states/modes". For example, do we need an "ECMP Handling State/Mode"? We may want to add that as a "state/mode" (lets just use the word "state"), this should be one of the open issues. Or we may want to do this as an exception (the special consideration), and not as the rule. This is just 2 possible way to move this forward. 4. The -00 version have the net relatively wide open. We will want to start narrowing down the net relatively quickly with -01. Hence the table in Figure 1 will be shorten quickly. Thanks! -- Kwok -- At 12:07 PM 7/23/2007, Bob Briscoe wrote: >Georgios, > >I've had a chance to read this one now - detailed review embedded... > >At 07:17 21/07/2007, Georgios Karagiannis wrote: >>On 7/20/2007, "Georgios Karagiannis" wrote: >> >> >Hi Phil >> > >> >Thank you very much for the comments! >> >Please see some remarks in line! >> > >> > >> >> -----Original Message----- >> >> From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] >> >> Sent: donderdag 19 juli 2007 12:12 >> >> To: khchan@nortel.com; pcn@ietf.org >> >> Subject: RE: [PCN] Fwd: I-D >> >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> >> >> Kwok, Georgios >> >> >> >> I read your draft. I have quite a lot of comments, but the >> >> basic msg is that i think it's a suitable starting point for >> >> a WG draft (towards the Charter milestone on this subject) - thanks. >> > >>Georgios: Thank you very much! > >I agree. > >> >> >> >> 1. motivation & goals >> >> this seems quite long for this draft, maybe the material is >> >> more suitable elsewhere eg architecture draft? >> > >>Georgios: We will try to reduce the text! >> >> >> >> 2. PCN encoding .. in current PCN .. mechanisms & Appendix I >> >> didn't find it useful to present the various proposed >> >> mechanisms. The dependence between encoding & mechanism >> >> (marking algo & PCN-boundary-node reaction) seem pretty weak >> >> to me. In fact I think there's almost none, except in terms >> >> of the number of codepoints that a proposed mechanism uses. >> >> (Even this is not clear-cut; for example 'Affected marking' >> >> could, I think, be easily added to those proposals that don't >> >> mention it, or indeed removed from those proposals that do.) >> >> >> >> So can this section simply say that different proposals >> >> require different numbers of encoding codepoints, and explain >> >> this in a paragraph? >> > >>Georgios: Please note that this draft should be a survey. >>Thus what we have done we have checked >>the existing PCN like mechanisms and briefly described them. >>In this way we could described which PCN features and which >>encoding modes/states are supported(and thus are available) by these >>mechanisms. >>I would like to keep this section. > >I disagree. Like Phil, I think it would be useful to try to cut down >drastically. The set of choices need to be laid out clearly, but I >found there was much more text than was needed for clarity. Once/if >this becomes an RFC, no-one is going to read it as the first or only >thing they ever read about PCN. So you can refer to things like the >architecture and get straight to the point in this one. > >- I agree with Phil that the marking algo text is fairly redundant >- there also seem to be a lot of options that could just be killed >off at birth (see later for specifics) because they don't work >sufficiently to go forward. They just lead to a combinatorial >explosion of text later, and waste IETF cycles discussing them. > >To cut down the choices, you need a criterion for a scheme getting >mentioned in this draft. I suggest it should be that someone has >already proposed it as part of a coherent PCN system, or that you >(the authors) can propose an encoding that would be a better >alternative to one already coherently proposed. > >So Fig 1 should have a ref column giving the ref that describes the >option. Then you make a rule: No ref, no row. > > >> >> >> >> Incidentally, I found it a bit confusing to describe "not >> >> congested" as a feature - at least, it doesn't seem a feature >> >> in the way that adm ctrl & flow termination are features. In >> >> fact, I found the discussion of 'features' in S3 & 4 a bit >> >> misleading (stick with codepoints). >> > >>Georgios: I think that a better term would be PCN encoding features, >>instead >>of PCN features. >>In this case "not congested" admission control and flow termination can >>be >>seen to belong in the same category. What we actually wanted to do is to >>emphaisze and differentiate between >>PCN encoding features and encoding modes/states. >>This is because one PCN encoding feature can be accomplished using more >>than >>one encoding modes/states >> >> >> >> >> I think phrases like "requirement for xx marking" could be >> >> better expressed (are they reqts? It's a choice about how >> >> many codepoints we >> >> have) >> >>Georgios: Do you have any suggestion on naming? >> >> >> >> >> 3. survey of encoding >> >> the table is very useful. > >I agree - very useful format. > >Another suggestion: Could a lot of the following text also be >tabulated and the longhand text removed. > >> >> >> >> Would it be better grouping the options in terms of the >> >> number of codepoints required? Ie if the mechanism needs 3 >> >> codepoints here are your options; if it needs 4 here they are etc. >> >>Georgios: I am not sure if this will encounter what we wanted to do. >>Please note that we intended to also include the PCN encoding features >>that are supported by each option. > >Please reconsider your response. Phil's talking sense. > >The top level question is how many states do we want to encode. >Then, the second level question is how do we encode them. > >> >> Should there be an option similar to option 9, but with PCN dscp? >> >> >> Should there be an option similar to option 10/11, but with 2 DSCPs? >> >> (that single marking mechanism could use) >> >>Georgios: I do not understand this remarks. Maybe we can discuss them in >>Chicago > >I'm trying to unpick how Georgios (and Kwok) are thinking. I >understand Phil's comments perfectly, so there must be some >misunderstanding here. > >> >> Should there be an option similar to option 9, but with PCN dscp? > >In fact, I don't understand why any of 5-9 are in the table at all >as they don't distinguish PCN from non-PCN (see my response "Yes, of >course" to Kwok's original question asking whether this was a key requirement). > >Here's quotes from options 5-9: >=========================================================================== >5: "The use of Not-ECT will separate PCN traffic from non[e] PCN >traffic with the big exception of [for] ECN traffic." > >6: "Encoding Option 6 suffers the same issue as Encoding Option 5 on >ability to separate traffic and indications between PCN and ECN traffic." > >7: "But this still suffers the same problems as Encoding Options 5 & 6" > >8: "But then it cannot distinguish PCN/ECN capable traffic from >non[e] PCN/ECN capable traffic, and still suffers the same issues as >Encoding Options 5, 6 and 7." > >9: "But it still suffers the lack of ability to be distinguished >from RFC3168 ECN traffic." >=========================================================================== > >So, all of options 5-9 should be killed. No-one has proposed them >anyway and they don't work. > >However, two of the ECN field combinations in them (6 & 9) should be >"reincarnated": two new ECN+DS combinations should be created >exactly like 6 & 9 except with 'PCN' in the DSCP column. > >> >> Should there be an option similar to option 10/11, but with 2 DSCPs? >> >> (that single marking mechanism could use) >> >>Georgios: I do not understand this remarks. Maybe we can discuss them in >>Chicago > >I believe Phil was trying to say what I've tabulated below - does >this help? The numbers in the body are for the different DSCPs >needed (ie 0 = DSCP0, 1 = DSCP1, 2 = DSCP2 etc). > >Encodg Option 10 11 12 13 >Not congested 0 0 0 0 >Admisn marked 1 - 1 1 >Termin marked 2 1 1 1 >ECMP affected 3 2 - 2 > >12 is Anna's single marking scheme using just DSCPs rather than DSCP + ECN > >13 is as 12, but using another DSCP for ECMP affected. > >AM & TM only need one DSCP, because Anna's single marking proposal >requires one less state (because the egress calculates both >admission and termination information from one marking state). > > >> >> >> >> Don't understand NDS-CE >>Georgios: will clarify! > >I think this is a (unsuccesful?) attempt to invent an ECN-only >scheme that makes sense (as I've said, I don't think any ECN-only >scheme will ever make sense). > >S.3.1.2 (Option 2) Why is additional control and separation of AM & >TM to provide edge nodes with added capabilites out of scope? Sounds >like it should be very much in scope to me, but I don't know what is >referred to here. > >> >> >> >> There are many typos where 'none' should be 'non' (non PCN capable >> >> transport) >> >>Georgios: agree it is a typo! >> >> >> >> >> In option 2 (& 6, 7) what does ECT(A) & ECT(T) mean? (I >> >> remember back in Briscoe-cl-phb we looked at an option where >> >> PCN marking was signalled by a *change* of codepoint, maybe >> >> it's referring to this idea? ie Adm marking is 01 -> 00 & >> >> Termination marking is 10 -> 11.) >> >>Georgios: yes this is taken from Briscoe-cl-phb draft. > >It was one of Joe's ideas documented in the cl-phb draft > > >> >> >> >> S3.4 use of IPFIX. I know you included this section because >> >> the charter seems to suggest it - but I must admit to finding >> >> it out of place in this doc. >> >>Georgios: I think it is good to include an option that uses for encoding >>and transport a different channel than the data path. > >I'd rather the arch doc explained why out-of-band signalling needs >more complexity to authenticate it than in-band and so out of scope >of PCN, then we could just delete it from this doc. > >That doesn't mean we're stopping people doing OOB signalling or >saying they shouldn't, it's just not relevant to PCN if they do. > > >> >> >> >> >> >> 4. comparison >> >> I wonder if it's worth starting this section with all the >> >> points that relate to how many codepoints there should be, >> >> and later handle the more detailed aspects. > >I strongly urge the authors to follow Phil's advice here. > >> >> >> >> Aspects of the first part: >> >> - will there be non-PCN traffic in the DS network? (surely a >> >> clear yes, ie we need a separate PCN DSCP(s)) >> >> - MPLS (which has limited codepoint space) [discussed in >> >> earlier Briscoe-cl-architecture drafts - could adapt text from there] > >draft-ietf-tsvwg-ecn-mpls is going to WG last call. Pls read it - it >has a lot about how PCN marking might be encoded into MPLS (without >pre-judging this PCN w-g encoding debate). > >> >> - whether 'affected marking' is needed /useful [no consensus >> >> at present >> >> - based on your text in S2] > >I agree with Phil. There's been little/no debate on whether dealing >with ECMP is best done by >a) encoding in packet markings or >b) by finding some way to include a path identifier in packets. > >I can give lots of reasons why ECMP affected marking might not work well. > >[Here's one... Imagine a scenario with a crowd converging on an >egress boundary node over different ECMP paths. Links on more than 1 >(e.g. 2) of the paths might start AM, with one marking at a much >lower level than the other. Both paths would start affected marking. >But affected marking only helps if just one path is affected, or of >all affected paths have the same marking level. > >Termination marking would suffer exactly the same problem.] > >An alternative solution might be to find a way for the egress to >distinguish measurements from each separate ECMP path, by unpicking >the path identifiers that ECMP is using to separate the paths in the >first place. > >This isn't the place to discuss the merits of solutions to ECMP (not >this draft, and not this mail thread). So I suggest for now this >draft just documents the possible need for an ECMP codepoint, and in >the comparison notes those encodings that would or would not have space for it. > >> >> - whether adm ctrl & termination ctrl can be driven by the >> >> same encoding >> >>Georgios: Check and discuss the above issues in Chicago > >I agree this should be considered - Anna's single marking is the ref >here (I'm not saying I agree, just that it should be considered). > >> >> >> >> - perhaps that adm ctrl & flow termination mechanisms are not >> >> required to both be deployed (just one could be) >> >> - etc >> >>Georgios: yes, but many scenarios require both ... Therefore is good to >>emphasize which of them support both and which not! >> >> >> >> this would actually shorten some of the draft, eg S4.2.3 >> >> could basically disappear. >> >> >> >> >> >> some of the ECN nonce discussion I found hard to follow >> >> 4.1.5. explain what 'alternate ECN semantics' means > >I disagree with Phil here. See my comment earlier about keeping this >I-D short by referring out. I'd rather you (Georgios & Kwok) didn't >repeat RFC4774 here in the interests of brevity. > >In S4.2.4 on distinguishing PCN from non-PCN, I agree with your >second option in the last para of the section: ie. don't have a >special DSCP for Not-PCN-Capable, because this role is fulfilled by >all the DSCPs that aren't PCN DSCPs. > >> >> S4.2.5 I didn't follow what cases you were distinguishing. > >I don't agree with (or don't understand) this statement in the >draft: "There are two issues indicated here. First: the ability to >distinguish PCN traffic from non[e] PCN traffic. Second: the ability >to distinguish PCN from ECN traffic." > >I think a lot of these misunderstandings would be solved if you >defined what you think you mean (in terms of scheduling behaviour as >well as marking behaviour) by >- PCN traffic >- non-PCN traffic >- ECN traffic > >See point below about Fred Baker's EF-ADMIT draft and the list >discussion started by Kwok on this. > >> >> there are a couple of issues at the high level: whether ECN >> >> nonce is useful with PCN; backwards compatibility of PCN with >> >> ECN nonce, > >The ECN nonce only works if the receiver processes the packets in >order. In this case, that would mean the PCN-ingress-node would have >to add sequence numbers to all the packets in the aggregate and the >PCN-egress-node would have to bring the aggregate of packets back >into order to check the none sum. > >Even then, the ECN nonce only provides protection once every >feedback message. That was useful with frequencies of feedback much >higher than marking frequencies (like the feedback every other >packet you get with TCP). PCN envisages feedback on signalling >timescales (at minimum every few thousand packets). > >So even if there was reliable ordering, a binary nonce would only >allow the PCN-ingress-node to detect a change to the last packet >marking before each feedback signal. And, of course, it doesn't >allow the network to check if the PCN-ingress-node is cheating. > >See draft-briscoe-re-pcn-border-cheat-00.txt for my suggested >encoding to deal with a wide range of anti-cheating cases. But other >encodings are possible - I'm not religious about this. I will >write-up the constraints I believe we have on the encoding. > >In a single trust domain scenario, we don't need anti-cheating >codepoints. Anti-cheating falls into the category of things to >consider for when we move to a multi-domain scenario. Having done >that exercise I can assure you that a codepoint for the ECN nonce is >not needed in PCN scenarios. > > >>eg in an 'unusual situation' such as the PCN pkt >> >> encounters an 'old' (ECN) router. >> >>Georgios: we have to update and enlarge section 4.2.5 > >The appendix of cl-phb on all the coding choices known at that time >contains excellent (and brief) text you can use for this draft. It >already included most of the workable choices you've covered, except >it just needed discussion of the extra codepoint that might be >needed for ECMP Affected (and one or two new ideas added from the >list since, such as Anna's single marking). Of course, it included >the RMD/LC Diffserv only encoding. > >In writing CL-PHB, a lot of time was spent taking combinations that >were effectively equivalent but just with arbitrarily different >choices of codepoints, and working out which ones were more robust >to config errors (alt ECN semantics discussion) or the presence of >unexpected legacy routers (S.4.1.6 of your I-D) etc. All that work >was documented succinctly, and could be easily copied and pasted >into this draft. > >A large amount of all the authors' time (including yours) had been >spent narrowing down the coding choices to those that represented >the different trade-offs each person thought important, so that the >list could discuss this. > >> >> >> >> could mention the discussion we had about the charter >> >> assuming a single domain, but we're going to keep strongly in >> >> mind that want it to work multi-domain in future. This seems >> >> esp important when it comes to encoding - after all, if it's >> >> just your domain you can do what you like. >> >> The multi-domain consideration has several impacts I think: >> >> * makes standardising encoding important >> >> * need to consider rfc4774 [because the issues it raises are >> >> probably more significant in the inter-domain case than in >> >> one domain under one operator's control] >> >>georgios: Thus you propose to include the multi-domain support as an >>additional criterion >> >> >> * need to consider limitations about encoding from >> >> draft-briscoe-re-pcn-border-cheat-00.txt [proposed mechanism >> >> for making PCN work inter-domain] >> >>Georgios: We will discuss this in CHicago > >Yes, the WG chairs have already said we should take multidomain into >account when considering encodings, but they need to re-affirm how >deeply that means we need to go. > >In section 6, I suggest all the paras except the last should be >moved to an architecture doc - they aren't security issues about the >encoding, but just general architectural security issues. The last >para needs expanding to address the above issues. > >Concerning the first para (MLPP), there is an impact on encoding but >its orthogonal to PCN encoding and dealt with already in MLPP documents. > >Other constraints should be mentioned: > >1. Architectural intent of different fields (DS & ECN) >------------------------------------------------------ >There was a long discussion on the tsvwg mailing list way back about >this (between you & I) that could be summarised in your I-D. > >2. PCN encoding encapsulation and decapsulation: >----------------------------------------------- >Within a PCN domain there may be arbitrary encapsulations of the >outer IP header in further outer headers, either as packets cross >link layers that support PCN (e.g. see draft-ietf-ecn-mpls-01.txt) >or because of IP in IP tunnelling (e.g. between two sites of an >enterprise that want IPsec between them as well as PCN >reservations). We cannot and should not constrain all tunnelling to >be outside a PCN domain. > >An ideal PCN encoding would allow any tunnel or link encapsulation >implementation to just encapsulate packets with the same rules for >processing the ECN and DS fields as non-PCN packets. Otherwise, all >tunnel and link technology vendors have to know about PCN as an exception. > >See "Layered Encapsulation of Congestion Notification" > (I posted a note about this >to the PCN list in Jun 07). > >This relates to the point about architectural intent of the fields: >tunnels will treat the fields differently depending on their >architectural intent. The DS field is processed differently by >tunnels than the ECN field, because the ECN field has a special >codepoint (Not-ECT) and a ranking of codepoints (CE>ECT) that makes >some transitions illegal. PCN is similar. It can have a multi-level >ranking (CE>TM>AM) and a Not-PCN state (excuse my abbreviated >terminology). Tunnels treat DS differently, just copying it. > >3. Distinguishing admission controlled from non-admission controlled >-------------------------------------------------------------------- >The draft should refer to (and take accont of) Fred Baker's "DSCPs >for Capacity Admitted Traffic" > with its suggestions on >how to distinguish between admission controlled EF and non-admission >controlled. It should also take account of the discussion on this >subject started by Kwok recently. > >Nits >---- >Section 1: ECN in RFC3168 was not only designed for TCP. It was >designed into IP for all transports but the TCP-ECN spec was defined >in the same doc, at the request of the Transport ADs at the time. > >Section 2: >3 occurrences of wording that (confusingly) implies PCN is already deployed. >"PCN based mechanisms are used..." >"the current available PCN based algorithms" >"the current PCN detection" > >S.2.1: Your draft implies CL-PHB is one proposal, whereas it was a >comparison of 5 different proposals. As editor, I know Phil was very >careful not to recommend one above the others (the one used in the >body of the text was "just to be concrete"). So there's no such >thing as "in CL-PHB a solution has been developed" or "the main >encoding scheme used in CL-PHB". > >Figure 1 -> Table 1 > >S.3 Surely there's no difference between Not-CE (Option 8) and ECT (Option 9)? > >Hope this all helps. > > >Bob > >>Best regards, >>Georgios >> >> >> >> >> best wishes - see you in Chicago! >> >> phil >> >> >> >> > -----Original Message----- >> >> > From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> >> > Sent: 05 July 2007 21:13 >> >> > To: pcn@ietf.org >> >> > Subject: [PCN] Fwd: I-D >> >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> > >> >> > PCN WG: >> >> > I would like to bring to your attention the availability of the >> >> > initial version of PCN Encoding Comparison draft. >> >> > >> >> > Please review and comment. And discuss on the PCN list. >> >> > >> >> > Thank you very much and looking forward to your comments. >> >> > -- Kwok and Georgios -- >> >> > >> >> > >To: i-d-announce@ietf.org >> >> > >Cc: >> >> > >From: Internet-Drafts@ietf.org >> >> > >Date: Thu, 05 Jul 2007 13:15:02 -0400 >> >> > >X-Scan-Signature: 14582b0692e7f70ce7111d04db3781c8 >> >> > >Subject: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> > >X-BeenThere: i-d-announce@ietf.org >> >> > >X-Mailman-Version: 2.1.5 >> >> > >Reply-To: internet-drafts@ietf.org >> >> > >List-Id: i-d-announce.ietf.org >> >> > >List-Unsubscribe: >> >> , >> >> > > >> >> > >List-Archive: >> >> > >List-Post: >> >> > >List-Help: >> >> > >List-Subscribe: >> >> , >> >> > > >> >> > >X-Spam-Score: 2.3 >> >> > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >> >> > ecarhea1.nortel.com >> >> > >X-Spam-Tests: FORGED_RCVD_HELO=0.05,MIME_BOUND_NEXTPART=0.106, >> >> > > NO_REAL_NAME=0.178,TO_CC_NOT_NORTEL=1,URIBL_MANURI=1 >> >> > >X-DNSBL-Score: -50 >> >> > >X-DNSBL-Servers: bl.nortel.com >> >> > >X-SMTP-HELO: megatron.ietf.org >> >> > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >> >> > >X-SMTP-RCPT-TO: >> >> > >> >> >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharr >> >> ath@nortel >> >> .c >> >> > >> >> om,babiarz@nortel.com,aceler@nortel.com,simmonds@nortel.com,hu >> >> iwc@nortel >> >> .c >> >> > >> >> om,amuhanna@nortel.com,gparsons@nortel.com,mchen@nortel.com,kh >> >> chan@norte >> >> l. >> >> > com >> >> > >X-SMTP-PEER-INFO: megatron.ietf.ORG [156.154.16.145] >> >> > >X-SMTP-REASON: PASSED >> >> > >X-SMTP-ID: 1183656101.14019435 >> >> > >X-OriginalArrivalTime: 05 Jul 2007 17:21:42.0459 (UTC) >> >> > >FILETIME=[F47A20B0:01C7BF28] >> >> > > >> >> > >A New Internet-Draft is available from the on-line Internet-Drafts >> >> > >directories. >> >> > > >> >> > > >> >> > > Title : Pre-Congestion Notification Encoding >> >> > Comparison >> >> > > Author(s) : K. Chan, G. Karagiannis >> >> > > Filename : >> >> draft-chan-pcn-encoding-comparison-00.txt >> >> > > Pages : 36 >> >> > > Date : 2007-7-5 >> >> > > >> >> > > DiffServ mechanisms have been developed to support Quality of >> >> Service >> >> > > (QoS). However, the level of assurance that can be >> >> provided with >> >> > > DiffServ without substantial over-provisioning is >> >> limited. Pre- >> >> > > Congestion Notification (PCN) investigates the use of per-flow >> >> > > admission control to provide the required service >> >> guarantees for >> >> the >> >> > > admitted traffic. While admission control will protect the QoS >> >> under >> >> > > normal operating conditions, an additional flow termination >> >> > > mechanism is necessary in the times of heavy congestion (e.g. >> >> caused >> >> > by route >> >> > > changes due to link or node failure). >> >> > > >> >> > > Encoding and their transport are required to carry the >> >> congestion >> >> and >> >> > > pre-congestion information from the congestion and >> >> pre-congestion >> >> > > points to the decision points. This document provides a survey >> >> of >> >> > > several encoding methods, using comparisons amongst >> >> them as a way >> >> to >> >> > > explain their strengths and weaknesses. >> >> > > >> >> > > >> >> > > >> >> > >A URL for this Internet-Draft is: >> >> > >> >> >http://www.ietf.org/internet-drafts/draft-chan-pcn-encoding-c >> >> omparison- >> >> > 00.txt >> >> > > >> >> > >To remove yourself from the I-D Announcement list, send a >> >> message to >> >> > >i-d-announce-request@ietf.org with the word unsubscribe in the body >> >> of >> >> > >the message. >> >> > >You can also visit >> >> https://www1.ietf.org/mailman/listinfo/I-D-announce >> >> > >to change your subscription settings. >> >> > > >> >> > >Internet-Drafts are also available by anonymous FTP. Login >> >> with the >> >> > >username "anonymous" and a password of your e-mail address. After >> >> > >logging in, type "cd internet-drafts" and then "get >> >> > >draft-chan-pcn-encoding-comparison-00.txt". >> >> > > >> >> > >A list of Internet-Drafts directories can be found in >> >> > >http://www.ietf.org/shadow.html or >> >> > >ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> >> > > >> >> > >Internet-Drafts can also be obtained by e-mail. >> >> > > >> >> > >Send a message to: >> >> > > mailserv@ietf.org. >> >> > >In the body type: >> >> > > "FILE /internet-drafts/draft-chan-pcn-encoding-comparison- >> >> > 00.txt". >> >> > > >> >> > >NOTE: The mail server at ietf.org can return the document in >> >> > > MIME-encoded form by using the "mpack" utility. >> >> To use this >> >> > > feature, insert the command "ENCODING mime" before the >> >> "FILE" >> >> > > command. To decode the response(s), you will >> >> need "munpack" >> >> or >> >> > > a MIME-compliant mail reader. Different >> >> MIME-compliant mail >> >> > readers >> >> > > exhibit different behavior, especially when dealing with >> >> > > "multipart" MIME messages (i.e. documents which have been >> >> split >> >> > > up into multiple messages), so check your local >> >> documentation on >> >> > > how to manipulate these messages. >> >> > > >> >> > >Below is the data which will enable a MIME compliant mail reader >> >> > >implementation to automatically retrieve the ASCII version of the >> >> > >Internet-Draft. >> >> > > >> >> > >Content-Type: text/plain >> >> > >Content-ID: <2007-7-5125842.I-D@ietf.org> >> >> > > >> >> > >ENCODING mime >> >> > >FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt >> >> > > >> >> > > >> >> > >> >> >> >> omparison- >> >> > 00.txt> >> >> > >_______________________________________________ >> >> > >I-D-Announce mailing list >> >> > >I-D-Announce@ietf.org >> >> > >https://www1.ietf.org/mailman/listinfo/i-d-announce >> >> > >> >> > >> >> > >> >> > >> >> > _______________________________________________ >> >> > PCN mailing list >> >> > PCN@ietf.org >> >> > https://www1.ietf.org/mailman/listinfo/pcn >> >> >> >> >> >> _______________________________________________ >> >> PCN mailing list >> >> PCN@ietf.org >> >> https://www1.ietf.org/mailman/listinfo/pcn >> >> >> > >> >> >>_______________________________________________ >>PCN mailing list >>PCN@ietf.org >>https://www1.ietf.org/mailman/listinfo/pcn > >____________________________________________________________________________ >Bob Briscoe, Networks Research Centre, BT Research >B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 23 20:15:32 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID83o-0002Ub-Cw; Mon, 23 Jul 2007 20:15:32 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ID83n-0002UW-4J for pcn-confirm+ok@megatron.ietf.org; Mon, 23 Jul 2007 20:15:31 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID83m-0002UO-Q4 for pcn@ietf.org; Mon, 23 Jul 2007 20:15:30 -0400 Received: from smtp3.smtp.bt.com ([217.32.164.138]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1ID83l-0007cj-Ap for pcn@ietf.org; Mon, 23 Jul 2007 20:15:30 -0400 Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp3.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 01:15:28 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 01:15:24 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185236123501; Tue, 24 Jul 2007 01:15:23 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.4]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6O0FGL7014943; Tue, 24 Jul 2007 01:15:21 +0100 Message-Id: <5.2.1.1.2.20070724004454.056d5cc8@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Tue, 24 Jul 2007 01:15:23 +0100 To: , , From: Bob Briscoe Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2F0@E03MVZ1-UKDY.doma in1.systemhost.net> References: <6439282641581441A36F7F6F83ED2ED201DB98C8@S4DE8PSAAFQ.mitte.t-com.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 24 Jul 2007 00:15:24.0979 (UTC) FILETIME=[BB499830:01C7CD87] X-Spam-Score: -1.0 (-) X-Scan-Signature: fb6060cb60c0cea16e3f7219e40a0a81 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Phil, Lars, Ruediger, Dragging back one issue on a thread that ended a couple of weeks ago... At 13:03 09/07/2007, philip.eardley@bt.com wrote: > > Section 1., paragraph 2: > > > Each link of the PCN- > > > domain can be associated with a configured-admissible-rate and a > > > configured-termination-rate. If PCN-traffic, that is traffic in the > > > DiffServ class(es) subject to the PCN mechanisms, on the link >exceeds > > > these rates then PCN-packets are admission-marked or termination- > > > marked. > > > > This paragraph and the related text in the remainder of the document > > imply some particular technical directions: (1) marking is done based > > on pre-configured rates, rather than, for example, queue dynamics, >and > > [RG] (1) I'm no expert on the mechanisms, but I prefer settable rates > > to allow traffic engineering. As far as I know rate limited queues are > > one > > solution option. >(1) I don't think 'everything but pre-configured rates' is excluded. I >think the algorithm will somehow involve a characteristic traffic rate. >I presume people who have other ideas about the algorithm should submit >a draft or comment on the existing suggestions. There is an open >question about how detailed the algorithm spec should be (what is an >implementation choice) I just wanted to point out that the configuration OAM section (8.2) of the arch draft (which I've now read) already says the configured-admissable rate need not actually be pre-configured. It refers to [21] by Songhurst et al, which suggests an alternative way to do marking. I don't know whether this was the sort of stuff Lars was thinking of. In Songhurst, the virtual queue does have a configured-rate, but the operator doesn't have to predict what proportion of each link to configure for PCN traffic. Instead, the virtual queue's drain rate is always set to (say) 99% of the line rate. But Songhurst's marking probability depends on the sum of the length of the PCN virtual queue plus the length(s) of the real lower priority queue(s) (e.g. BE). So if there's not much BE, admission control allows more PCN traffic before it kicks in. But if there's a lot of BE, admission control kicks at a lower level of PCN. IOW, the boundary between PCN & other traffic floats depending on their relative loads. Songhurst also describes how this floating can be bounded between high a low water marks, so there's min amounts of capacity for BE and a min for PCN (protecting PCN during BE DoS attacks). Basically, it's all about getting the best out of the network however good or bad the config is. Two reasons for saying this to the list: i) Is being less sensitive to accurate traffic matrix prediction something other operators would be interested in? ii) The text needs correcting slightly, because it says Songhurst's method doesn't use a pre-configured rate, but it does - it just doesn't have to be accurate. Bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 23 20:19:48 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID87w-0003RC-AE; Mon, 23 Jul 2007 20:19:48 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1ID87v-0003R7-60 for pcn-confirm+ok@megatron.ietf.org; Mon, 23 Jul 2007 20:19:47 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1ID87u-0003Qz-Le for pcn@ietf.org; Mon, 23 Jul 2007 20:19:46 -0400 Received: from zcars04f.nortel.com ([47.129.242.57]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1ID87r-0006ae-P6 for pcn@ietf.org; Mon, 23 Jul 2007 20:19:46 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zcars04f.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6O0Jen25891; Tue, 24 Jul 2007 00:19:41 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt Date: Mon, 23 Jul 2007 20:19:39 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651169999C@zcarhxm1.corp.nortel.com> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt Thread-Index: AcfNTa1np8r3bl/0Qcy5DuNvOooXiQAOg5xA References: <004c01c7cb00$f65088a0$4c0d5982@dynamic.ewi.utwente.nl> <5.2.1.1.2.20070722214056.02a64518@pop3.jungle.bt.co.uk> From: "Jozef Babiarz" To: "Kwok-Ho Chan" , "Bob Briscoe" X-Spam-Score: 0.0 (/) X-Scan-Signature: 19fc2b47780353ba1ee25032fbc339e7 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Kwok wrote July 23, 2007 >3. There may be cases where special considerations are applicable wrt >possible > additional "states/modes". For example, do we need an "ECMP=20 >Handling State/Mode"? > We may want to add that as a "state/mode" (lets just use the=20 >word "state"), this should > be one of the open issues. > Or we may want to do this as an exception (the special=20 >consideration), and not as the rule. Do it as a special case for the marking approach that needs it. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Chan, Kwok-Ho (BL60:470)=20 Sent: July 23, 2007 1:19 PM To: Bob Briscoe Cc: pcn@ietf.org Subject: RE: [PCN] Fwd: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt My personal opinion on the direction of the draft is: 1. Simplify the draft by focusing on Encoding and not Algorithm. I actually have the same opinion and are trying to de-emphasize=20 the Algorithm parts of the draft by moving them to the appendix. I have also=20 removed the more detailed descriptions of 3sm algorithm from the appendix (the one that I=20 can remove without making someone feel bad that their algorithm is not represented=20 in this draft). (I wanted people to read the short 3sm draft instead of the summary. :) 2. I wanted to make the Encoding comparison (and choices) be as independent as possible from the Algorithm comparison (and choices). We have=20 wrote the latest Algorithm drafts without calling for specific Encoding (the=20 bits), just indicating the "states" the Algorithm requires/uses to carry the=20 information output of the Algorithms. Hence we should try to continue to achieve the "independence" goal of the draft. 3. There may be cases where special considerations are applicable wrt possible additional "states/modes". For example, do we need an "ECMP=20 Handling State/Mode"? We may want to add that as a "state/mode" (lets just use the=20 word "state"), this should be one of the open issues. Or we may want to do this as an exception (the special=20 consideration), and not as the rule. This is just 2 possible way to move this forward. 4. The -00 version have the net relatively wide open. We will want=20 to start narrowing down the net relatively quickly with -01. Hence the table in Figure=20 1 will be shorten quickly. Thanks! -- Kwok -- At 12:07 PM 7/23/2007, Bob Briscoe wrote: >Georgios, > >I've had a chance to read this one now - detailed review embedded... > >At 07:17 21/07/2007, Georgios Karagiannis wrote: >>On 7/20/2007, "Georgios Karagiannis" wrote: >> >> >Hi Phil >> > >> >Thank you very much for the comments! >> >Please see some remarks in line! >> > >> > >> >> -----Original Message----- >> >> From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] >> >> Sent: donderdag 19 juli 2007 12:12 >> >> To: khchan@nortel.com; pcn@ietf.org >> >> Subject: RE: [PCN] Fwd: I-D >> >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> >> >> Kwok, Georgios >> >> >> >> I read your draft. I have quite a lot of comments, but the >> >> basic msg is that i think it's a suitable starting point for >> >> a WG draft (towards the Charter milestone on this subject) - thanks. >> > >>Georgios: Thank you very much! > >I agree. > >> >> >> >> 1. motivation & goals >> >> this seems quite long for this draft, maybe the material is >> >> more suitable elsewhere eg architecture draft? >> > >>Georgios: We will try to reduce the text! >> >> >> >> 2. PCN encoding .. in current PCN .. mechanisms & Appendix I >> >> didn't find it useful to present the various proposed >> >> mechanisms. The dependence between encoding & mechanism >> >> (marking algo & PCN-boundary-node reaction) seem pretty weak >> >> to me. In fact I think there's almost none, except in terms >> >> of the number of codepoints that a proposed mechanism uses. >> >> (Even this is not clear-cut; for example 'Affected marking' >> >> could, I think, be easily added to those proposals that don't >> >> mention it, or indeed removed from those proposals that do.) >> >> >> >> So can this section simply say that different proposals >> >> require different numbers of encoding codepoints, and explain >> >> this in a paragraph? >> > >>Georgios: Please note that this draft should be a survey. >>Thus what we have done we have checked >>the existing PCN like mechanisms and briefly described them. >>In this way we could described which PCN features and which >>encoding modes/states are supported(and thus are available) by these >>mechanisms. >>I would like to keep this section. > >I disagree. Like Phil, I think it would be useful to try to cut down=20 >drastically. The set of choices need to be laid out clearly, but I=20 >found there was much more text than was needed for clarity. Once/if=20 >this becomes an RFC, no-one is going to read it as the first or only=20 >thing they ever read about PCN. So you can refer to things like the=20 >architecture and get straight to the point in this one. > >- I agree with Phil that the marking algo text is fairly redundant >- there also seem to be a lot of options that could just be killed=20 >off at birth (see later for specifics) because they don't work=20 >sufficiently to go forward. They just lead to a combinatorial=20 >explosion of text later, and waste IETF cycles discussing them. > >To cut down the choices, you need a criterion for a scheme getting=20 >mentioned in this draft. I suggest it should be that someone has=20 >already proposed it as part of a coherent PCN system, or that you=20 >(the authors) can propose an encoding that would be a better=20 >alternative to one already coherently proposed. > >So Fig 1 should have a ref column giving the ref that describes the=20 >option. Then you make a rule: No ref, no row. > > >> >> >> >> Incidentally, I found it a bit confusing to describe "not >> >> congested" as a feature - at least, it doesn't seem a feature >> >> in the way that adm ctrl & flow termination are features. In >> >> fact, I found the discussion of 'features' in S3 & 4 a bit >> >> misleading (stick with codepoints). >> > >>Georgios: I think that a better term would be PCN encoding features, >>instead >>of PCN features. >>In this case "not congested" admission control and flow termination can >>be >>seen to belong in the same category. What we actually wanted to do is to >>emphaisze and differentiate between >>PCN encoding features and encoding modes/states. >>This is because one PCN encoding feature can be accomplished using more >>than >>one encoding modes/states >> >> >> >> >> I think phrases like "requirement for xx marking" could be >> >> better expressed (are they reqts? It's a choice about how >> >> many codepoints we >> >> have) >> >>Georgios: Do you have any suggestion on naming? >> >> >> >> >> 3. survey of encoding >> >> the table is very useful. > >I agree - very useful format. > >Another suggestion: Could a lot of the following text also be=20 >tabulated and the longhand text removed. > >> >> >> >> Would it be better grouping the options in terms of the >> >> number of codepoints required? Ie if the mechanism needs 3 >> >> codepoints here are your options; if it needs 4 here they are etc. >> >>Georgios: I am not sure if this will encounter what we wanted to do. >>Please note that we intended to also include the PCN encoding features >>that are supported by each option. > >Please reconsider your response. Phil's talking sense. > >The top level question is how many states do we want to encode.=20 >Then, the second level question is how do we encode them. > >> >> Should there be an option similar to option 9, but with PCN dscp? >> >> >> Should there be an option similar to option 10/11, but with 2 DSCPs? >> >> (that single marking mechanism could use) >> >>Georgios: I do not understand this remarks. Maybe we can discuss them in >>Chicago > >I'm trying to unpick how Georgios (and Kwok) are thinking. I=20 >understand Phil's comments perfectly, so there must be some=20 >misunderstanding here. > >> >> Should there be an option similar to option 9, but with PCN dscp? > >In fact, I don't understand why any of 5-9 are in the table at all=20 >as they don't distinguish PCN from non-PCN (see my response "Yes, of=20 >course" to Kwok's original question asking whether this was a key requirement). > >Here's quotes from options 5-9: >=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=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=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D >5: "The use of Not-ECT will separate PCN traffic from non[e] PCN=20 >traffic with the big exception of [for] ECN traffic." > >6: "Encoding Option 6 suffers the same issue as Encoding Option 5 on=20 >ability to separate traffic and indications between PCN and ECN traffic." > >7: "But this still suffers the same problems as Encoding Options 5 & 6" > >8: "But then it cannot distinguish PCN/ECN capable traffic from=20 >non[e] PCN/ECN capable traffic, and still suffers the same issues as=20 >Encoding Options 5, 6 and 7." > >9: "But it still suffers the lack of ability to be distinguished=20 >from RFC3168 ECN traffic." >=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=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=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D > >So, all of options 5-9 should be killed. No-one has proposed them=20 >anyway and they don't work. > >However, two of the ECN field combinations in them (6 & 9) should be=20 >"reincarnated": two new ECN+DS combinations should be created=20 >exactly like 6 & 9 except with 'PCN' in the DSCP column. > >> >> Should there be an option similar to option 10/11, but with 2 DSCPs? >> >> (that single marking mechanism could use) >> >>Georgios: I do not understand this remarks. Maybe we can discuss them in >>Chicago > >I believe Phil was trying to say what I've tabulated below - does=20 >this help? The numbers in the body are for the different DSCPs=20 >needed (ie 0 =3D DSCP0, 1 =3D DSCP1, 2 =3D DSCP2 etc). > >Encodg Option 10 11 12 13 >Not congested 0 0 0 0 >Admisn marked 1 - 1 1 >Termin marked 2 1 1 1 >ECMP affected 3 2 - 2 > >12 is Anna's single marking scheme using just DSCPs rather than DSCP + ECN > >13 is as 12, but using another DSCP for ECMP affected. > >AM & TM only need one DSCP, because Anna's single marking proposal=20 >requires one less state (because the egress calculates both=20 >admission and termination information from one marking state). > > >> >> >> >> Don't understand NDS-CE >>Georgios: will clarify! > >I think this is a (unsuccesful?) attempt to invent an ECN-only=20 >scheme that makes sense (as I've said, I don't think any ECN-only=20 >scheme will ever make sense). > >S.3.1.2 (Option 2) Why is additional control and separation of AM &=20 >TM to provide edge nodes with added capabilites out of scope? Sounds=20 >like it should be very much in scope to me, but I don't know what is=20 >referred to here. > >> >> >> >> There are many typos where 'none' should be 'non' (non PCN capable >> >> transport) >> >>Georgios: agree it is a typo! >> >> >> >> >> In option 2 (& 6, 7) what does ECT(A) & ECT(T) mean? (I >> >> remember back in Briscoe-cl-phb we looked at an option where >> >> PCN marking was signalled by a *change* of codepoint, maybe >> >> it's referring to this idea? ie Adm marking is 01 -> 00 & >> >> Termination marking is 10 -> 11.) >> >>Georgios: yes this is taken from Briscoe-cl-phb draft. > >It was one of Joe's ideas documented in the cl-phb draft > > >> >> >> >> S3.4 use of IPFIX. I know you included this section because >> >> the charter seems to suggest it - but I must admit to finding >> >> it out of place in this doc. >> >>Georgios: I think it is good to include an option that uses for encoding >>and transport a different channel than the data path. > >I'd rather the arch doc explained why out-of-band signalling needs=20 >more complexity to authenticate it than in-band and so out of scope=20 >of PCN, then we could just delete it from this doc. > >That doesn't mean we're stopping people doing OOB signalling or=20 >saying they shouldn't, it's just not relevant to PCN if they do. > > >> >> >> >> >> >> 4. comparison >> >> I wonder if it's worth starting this section with all the >> >> points that relate to how many codepoints there should be, >> >> and later handle the more detailed aspects. > >I strongly urge the authors to follow Phil's advice here. > >> >> >> >> Aspects of the first part: >> >> - will there be non-PCN traffic in the DS network? (surely a >> >> clear yes, ie we need a separate PCN DSCP(s)) >> >> - MPLS (which has limited codepoint space) [discussed in >> >> earlier Briscoe-cl-architecture drafts - could adapt text from there] > >draft-ietf-tsvwg-ecn-mpls is going to WG last call. Pls read it - it=20 >has a lot about how PCN marking might be encoded into MPLS (without=20 >pre-judging this PCN w-g encoding debate). > >> >> - whether 'affected marking' is needed /useful [no consensus >> >> at present >> >> - based on your text in S2] > >I agree with Phil. There's been little/no debate on whether dealing=20 >with ECMP is best done by >a) encoding in packet markings or >b) by finding some way to include a path identifier in packets. > >I can give lots of reasons why ECMP affected marking might not work well. > >[Here's one... Imagine a scenario with a crowd converging on an=20 >egress boundary node over different ECMP paths. Links on more than 1=20 >(e.g. 2) of the paths might start AM, with one marking at a much=20 >lower level than the other. Both paths would start affected marking.=20 >But affected marking only helps if just one path is affected, or of=20 >all affected paths have the same marking level. > >Termination marking would suffer exactly the same problem.] > >An alternative solution might be to find a way for the egress to=20 >distinguish measurements from each separate ECMP path, by unpicking=20 >the path identifiers that ECMP is using to separate the paths in the=20 >first place. > >This isn't the place to discuss the merits of solutions to ECMP (not=20 >this draft, and not this mail thread). So I suggest for now this=20 >draft just documents the possible need for an ECMP codepoint, and in=20 >the comparison notes those encodings that would or would not have space for it. > >> >> - whether adm ctrl & termination ctrl can be driven by the >> >> same encoding >> >>Georgios: Check and discuss the above issues in Chicago > >I agree this should be considered - Anna's single marking is the ref=20 >here (I'm not saying I agree, just that it should be considered). > >> >> >> >> - perhaps that adm ctrl & flow termination mechanisms are not >> >> required to both be deployed (just one could be) >> >> - etc >> >>Georgios: yes, but many scenarios require both ... Therefore is good to >>emphasize which of them support both and which not! >> >> >> >> this would actually shorten some of the draft, eg S4.2.3 >> >> could basically disappear. >> >> >> >> >> >> some of the ECN nonce discussion I found hard to follow >> >> 4.1.5. explain what 'alternate ECN semantics' means > >I disagree with Phil here. See my comment earlier about keeping this=20 >I-D short by referring out. I'd rather you (Georgios & Kwok) didn't=20 >repeat RFC4774 here in the interests of brevity. > >In S4.2.4 on distinguishing PCN from non-PCN, I agree with your=20 >second option in the last para of the section: ie. don't have a=20 >special DSCP for Not-PCN-Capable, because this role is fulfilled by=20 >all the DSCPs that aren't PCN DSCPs. > >> >> S4.2.5 I didn't follow what cases you were distinguishing. > >I don't agree with (or don't understand) this statement in the=20 >draft: "There are two issues indicated here. First: the ability to=20 >distinguish PCN traffic from non[e] PCN traffic. Second: the ability=20 >to distinguish PCN from ECN traffic." > >I think a lot of these misunderstandings would be solved if you=20 >defined what you think you mean (in terms of scheduling behaviour as=20 >well as marking behaviour) by >- PCN traffic >- non-PCN traffic >- ECN traffic > >See point below about Fred Baker's EF-ADMIT draft and the list=20 >discussion started by Kwok on this. > >> >> there are a couple of issues at the high level: whether ECN >> >> nonce is useful with PCN; backwards compatibility of PCN with >> >> ECN nonce, > >The ECN nonce only works if the receiver processes the packets in=20 >order. In this case, that would mean the PCN-ingress-node would have=20 >to add sequence numbers to all the packets in the aggregate and the=20 >PCN-egress-node would have to bring the aggregate of packets back=20 >into order to check the none sum. > >Even then, the ECN nonce only provides protection once every=20 >feedback message. That was useful with frequencies of feedback much=20 >higher than marking frequencies (like the feedback every other=20 >packet you get with TCP). PCN envisages feedback on signalling=20 >timescales (at minimum every few thousand packets). > >So even if there was reliable ordering, a binary nonce would only=20 >allow the PCN-ingress-node to detect a change to the last packet=20 >marking before each feedback signal. And, of course, it doesn't=20 >allow the network to check if the PCN-ingress-node is cheating. > >See draft-briscoe-re-pcn-border-cheat-00.txt for my suggested=20 >encoding to deal with a wide range of anti-cheating cases. But other=20 >encodings are possible - I'm not religious about this. I will=20 >write-up the constraints I believe we have on the encoding. > >In a single trust domain scenario, we don't need anti-cheating=20 >codepoints. Anti-cheating falls into the category of things to=20 >consider for when we move to a multi-domain scenario. Having done=20 >that exercise I can assure you that a codepoint for the ECN nonce is=20 >not needed in PCN scenarios. > > >>eg in an 'unusual situation' such as the PCN pkt >> >> encounters an 'old' (ECN) router. >> >>Georgios: we have to update and enlarge section 4.2.5 > >The appendix of cl-phb on all the coding choices known at that time=20 >contains excellent (and brief) text you can use for this draft. It=20 >already included most of the workable choices you've covered, except=20 >it just needed discussion of the extra codepoint that might be=20 >needed for ECMP Affected (and one or two new ideas added from the=20 >list since, such as Anna's single marking). Of course, it included=20 >the RMD/LC Diffserv only encoding. > >In writing CL-PHB, a lot of time was spent taking combinations that=20 >were effectively equivalent but just with arbitrarily different=20 >choices of codepoints, and working out which ones were more robust=20 >to config errors (alt ECN semantics discussion) or the presence of=20 >unexpected legacy routers (S.4.1.6 of your I-D) etc. All that work=20 >was documented succinctly, and could be easily copied and pasted=20 >into this draft. > >A large amount of all the authors' time (including yours) had been=20 >spent narrowing down the coding choices to those that represented=20 >the different trade-offs each person thought important, so that the=20 >list could discuss this. > >> >> >> >> could mention the discussion we had about the charter >> >> assuming a single domain, but we're going to keep strongly in >> >> mind that want it to work multi-domain in future. This seems >> >> esp important when it comes to encoding - after all, if it's >> >> just your domain you can do what you like. >> >> The multi-domain consideration has several impacts I think: >> >> * makes standardising encoding important >> >> * need to consider rfc4774 [because the issues it raises are >> >> probably more significant in the inter-domain case than in >> >> one domain under one operator's control] >> >>georgios: Thus you propose to include the multi-domain support as an >>additional criterion >> >> >> * need to consider limitations about encoding from >> >> draft-briscoe-re-pcn-border-cheat-00.txt [proposed mechanism >> >> for making PCN work inter-domain] >> >>Georgios: We will discuss this in CHicago > >Yes, the WG chairs have already said we should take multidomain into=20 >account when considering encodings, but they need to re-affirm how=20 >deeply that means we need to go. > >In section 6, I suggest all the paras except the last should be=20 >moved to an architecture doc - they aren't security issues about the=20 >encoding, but just general architectural security issues. The last=20 >para needs expanding to address the above issues. > >Concerning the first para (MLPP), there is an impact on encoding but=20 >its orthogonal to PCN encoding and dealt with already in MLPP documents. > >Other constraints should be mentioned: > >1. Architectural intent of different fields (DS & ECN) >------------------------------------------------------ >There was a long discussion on the tsvwg mailing list way back about=20 >this (between you & I) that could be summarised in your I-D. > >2. PCN encoding encapsulation and decapsulation: >----------------------------------------------- >Within a PCN domain there may be arbitrary encapsulations of the=20 >outer IP header in further outer headers, either as packets cross=20 >link layers that support PCN (e.g. see draft-ietf-ecn-mpls-01.txt)=20 >or because of IP in IP tunnelling (e.g. between two sites of an=20 >enterprise that want IPsec between them as well as PCN=20 >reservations). We cannot and should not constrain all tunnelling to=20 >be outside a PCN domain. > >An ideal PCN encoding would allow any tunnel or link encapsulation=20 >implementation to just encapsulate packets with the same rules for=20 >processing the ECN and DS fields as non-PCN packets. Otherwise, all=20 >tunnel and link technology vendors have to know about PCN as an exception. > >See "Layered Encapsulation of Congestion Notification"=20 > (I posted a note about this=20 >to the PCN list in Jun 07). > >This relates to the point about architectural intent of the fields:=20 >tunnels will treat the fields differently depending on their=20 >architectural intent. The DS field is processed differently by=20 >tunnels than the ECN field, because the ECN field has a special=20 >codepoint (Not-ECT) and a ranking of codepoints (CE>ECT) that makes=20 >some transitions illegal. PCN is similar. It can have a multi-level=20 >ranking (CE>TM>AM) and a Not-PCN state (excuse my abbreviated=20 >terminology). Tunnels treat DS differently, just copying it. > >3. Distinguishing admission controlled from non-admission controlled >-------------------------------------------------------------------- >The draft should refer to (and take accont of) Fred Baker's "DSCPs=20 >for Capacity Admitted Traffic"=20 > with its suggestions on=20 >how to distinguish between admission controlled EF and non-admission=20 >controlled. It should also take account of the discussion on this=20 >subject started by Kwok recently. > >Nits >---- >Section 1: ECN in RFC3168 was not only designed for TCP. It was=20 >designed into IP for all transports but the TCP-ECN spec was defined=20 >in the same doc, at the request of the Transport ADs at the time. > >Section 2: >3 occurrences of wording that (confusingly) implies PCN is already deployed. >"PCN based mechanisms are used..." >"the current available PCN based algorithms" >"the current PCN detection" > >S.2.1: Your draft implies CL-PHB is one proposal, whereas it was a=20 >comparison of 5 different proposals. As editor, I know Phil was very=20 >careful not to recommend one above the others (the one used in the=20 >body of the text was "just to be concrete"). So there's no such=20 >thing as "in CL-PHB a solution has been developed" or "the main=20 >encoding scheme used in CL-PHB". > >Figure 1 -> Table 1 > >S.3 Surely there's no difference between Not-CE (Option 8) and ECT (Option 9)? > >Hope this all helps. > > >Bob > >>Best regards, >>Georgios >> >> >> >> >> best wishes - see you in Chicago! >> >> phil >> >> >> >> > -----Original Message----- >> >> > From: Kwok-Ho Chan [mailto:khchan@nortel.com] >> >> > Sent: 05 July 2007 21:13 >> >> > To: pcn@ietf.org >> >> > Subject: [PCN] Fwd: I-D >> >> ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> > >> >> > PCN WG: >> >> > I would like to bring to your attention the availability of the >> >> > initial version of PCN Encoding Comparison draft. >> >> > >> >> > Please review and comment. And discuss on the PCN list. >> >> > >> >> > Thank you very much and looking forward to your comments. >> >> > -- Kwok and Georgios -- >> >> > >> >> > >To: i-d-announce@ietf.org >> >> > >Cc: >> >> > >From: Internet-Drafts@ietf.org >> >> > >Date: Thu, 05 Jul 2007 13:15:02 -0400 >> >> > >X-Scan-Signature: 14582b0692e7f70ce7111d04db3781c8 >> >> > >Subject: I-D ACTION:draft-chan-pcn-encoding-comparison-00.txt >> >> > >X-BeenThere: i-d-announce@ietf.org >> >> > >X-Mailman-Version: 2.1.5 >> >> > >Reply-To: internet-drafts@ietf.org >> >> > >List-Id: i-d-announce.ietf.org >> >> > >List-Unsubscribe: >> >> , >> >> > > >> >> > >List-Archive: >> >> > >List-Post: >> >> > >List-Help: = >> >> > >List-Subscribe: >> >> , >> >> > > >> >> > >X-Spam-Score: 2.3 >> >> > >X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on >> >> > ecarhea1.nortel.com >> >> > >X-Spam-Tests: = FORGED_RCVD_HELO=3D0.05,MIME_BOUND_NEXTPART=3D0.106, >> >> > > NO_REAL_NAME=3D0.178,TO_CC_NOT_NORTEL=3D1,URIBL_MANURI=3D1 >> >> > >X-DNSBL-Score: -50 >> >> > >X-DNSBL-Servers: bl.nortel.com >> >> > >X-SMTP-HELO: megatron.ietf.org >> >> > >X-SMTP-MAIL-FROM: i-d-announce-bounces@ietf.org >> >> > >X-SMTP-RCPT-TO: >> >> > >> >> >kboyle@nortel.com,bstucker@nortel.com,balles@nortel.com,bharr >> >> ath@nortel >> >> .c >> >> > >> >> om,babiarz@nortel.com,aceler@nortel.com,simmonds@nortel.com,hu >> >> iwc@nortel >> >> .c >> >> > >> >> om,amuhanna@nortel.com,gparsons@nortel.com,mchen@nortel.com,kh >> >> chan@norte >> >> l. >> >> > com >> >> > >X-SMTP-PEER-INFO: megatron.ietf.ORG [156.154.16.145] >> >> > >X-SMTP-REASON: PASSED >> >> > >X-SMTP-ID: 1183656101.14019435 >> >> > >X-OriginalArrivalTime: 05 Jul 2007 17:21:42.0459 (UTC) >> >> > >FILETIME=3D[F47A20B0:01C7BF28] >> >> > > >> >> > >A New Internet-Draft is available from the on-line Internet-Drafts >> >> > >directories. >> >> > > >> >> > > >> >> > > Title : Pre-Congestion Notification Encoding >> >> > Comparison >> >> > > Author(s) : K. Chan, G. Karagiannis >> >> > > Filename : >> >> draft-chan-pcn-encoding-comparison-00.txt >> >> > > Pages : 36 >> >> > > Date : 2007-7-5 >> >> > > >> >> > > DiffServ mechanisms have been developed to support Quality of >> >> Service >> >> > > (QoS). However, the level of assurance that can be >> >> provided with >> >> > > DiffServ without substantial over-provisioning is >> >> limited. Pre- >> >> > > Congestion Notification (PCN) investigates the use of per-flow >> >> > > admission control to provide the required service >> >> guarantees for >> >> the >> >> > > admitted traffic. While admission control will protect the QoS >> >> under >> >> > > normal operating conditions, an additional flow termination >> >> > > mechanism is necessary in the times of heavy congestion (e.g. >> >> caused >> >> > by route >> >> > > changes due to link or node failure). >> >> > > >> >> > > Encoding and their transport are required to carry the >> >> congestion >> >> and >> >> > > pre-congestion information from the congestion and >> >> pre-congestion >> >> > > points to the decision points. This document provides a survey >> >> of >> >> > > several encoding methods, using comparisons amongst >> >> them as a way >> >> to >> >> > > explain their strengths and weaknesses. >> >> > > >> >> > > >> >> > > >> >> > >A URL for this Internet-Draft is: >> >> > >> >> >http://www.ietf.org/internet-drafts/draft-chan-pcn-encoding-c >> >> omparison- >> >> > 00.txt >> >> > > >> >> > >To remove yourself from the I-D Announcement list, send a >> >> message to >> >> > >i-d-announce-request@ietf.org with the word unsubscribe in the body >> >> of >> >> > >the message. >> >> > >You can also visit >> >> https://www1.ietf.org/mailman/listinfo/I-D-announce >> >> > >to change your subscription settings. >> >> > > >> >> > >Internet-Drafts are also available by anonymous FTP. Login >> >> with the >> >> > >username "anonymous" and a password of your e-mail address. After >> >> > >logging in, type "cd internet-drafts" and then "get >> >> > >draft-chan-pcn-encoding-comparison-00.txt". >> >> > > >> >> > >A list of Internet-Drafts directories can be found in >> >> > >http://www.ietf.org/shadow.html or >> >> > >ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> >> > > >> >> > >Internet-Drafts can also be obtained by e-mail. >> >> > > >> >> > >Send a message to: >> >> > > mailserv@ietf.org. >> >> > >In the body type: >> >> > > "FILE /internet-drafts/draft-chan-pcn-encoding-comparison- >> >> > 00.txt". >> >> > > >> >> > >NOTE: The mail server at ietf.org can return the document in >> >> > > MIME-encoded form by using the "mpack" utility. >> >> To use this >> >> > > feature, insert the command "ENCODING mime" before the >> >> "FILE" >> >> > > command. To decode the response(s), you will >> >> need "munpack" >> >> or >> >> > > a MIME-compliant mail reader. Different >> >> MIME-compliant mail >> >> > readers >> >> > > exhibit different behavior, especially when dealing with >> >> > > "multipart" MIME messages (i.e. documents which have been >> >> split >> >> > > up into multiple messages), so check your local >> >> documentation on >> >> > > how to manipulate these messages. >> >> > > >> >> > >Below is the data which will enable a MIME compliant mail reader >> >> > >implementation to automatically retrieve the ASCII version of the >> >> > >Internet-Draft. >> >> > > >> >> > >Content-Type: text/plain >> >> > >Content-ID: <2007-7-5125842.I-D@ietf.org> >> >> > > >> >> > >ENCODING mime >> >> > >FILE /internet-drafts/draft-chan-pcn-encoding-comparison-00.txt >> >> > > >> >> > > >> >> > >> >> >>=20 >> omparison- >> >> > 00.txt> >> >> > >_______________________________________________ >> >> > >I-D-Announce mailing list >> >> > >I-D-Announce@ietf.org >> >> > >https://www1.ietf.org/mailman/listinfo/i-d-announce >> >> > >> >> > >> >> > >> >> > >> >> > _______________________________________________ >> >> > PCN mailing list >> >> > PCN@ietf.org >> >> > https://www1.ietf.org/mailman/listinfo/pcn >> >> >> >> >> >> _______________________________________________ >> >> PCN mailing list >> >> PCN@ietf.org >> >> https://www1.ietf.org/mailman/listinfo/pcn >> >> >> > >> >> >>_______________________________________________ >>PCN mailing list >>PCN@ietf.org >>https://www1.ietf.org/mailman/listinfo/pcn > >_______________________________________________________________________ _____ >Bob Briscoe, Networks Research Centre, BT Research >B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 02:35:54 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDDzt-0000Ug-IL; Tue, 24 Jul 2007 02:35:53 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDDzs-0000Ua-CG for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 02:35:52 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDDzr-0000US-Vy for pcn@ietf.org; Tue, 24 Jul 2007 02:35:52 -0400 Received: from tcmail31.telekom.de ([217.6.95.238]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDDzr-0005W8-Eh for pcn@ietf.org; Tue, 24 Jul 2007 02:35:51 -0400 Received: from S4DE8PSAANQ.mitte.t-com.de by tcmail31.telekom.de with ESMTP; Tue, 24 Jul 2007 08:35:47 +0200 Received: from S4DE8PSAAFQ.mitte.t-com.de ([10.151.180.5]) by S4DE8PSAANQ.mitte.t-com.de with Microsoft SMTPSVC(6.0.3790.3959); Tue, 24 Jul 2007 08:35:25 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] thoughts for draft-charny-pcn-single-marking Date: Tue, 24 Jul 2007 08:35:25 +0200 Message-Id: <6439282641581441A36F7F6F83ED2ED201DB9A35@S4DE8PSAAFQ.mitte.t-com.de> In-Reply-To: <322832.44980.qm@web33001.mail.mud.yahoo.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] thoughts for draft-charny-pcn-single-marking thread-index: AcfNQ4fxduR17PyAS6CUTgBLFgP/jQAeGtEg From: "Geib, Ruediger" To: X-OriginalArrivalTime: 24 Jul 2007 06:35:25.0607 (UTC) FILETIME=[D1855370:01C7CDBC] X-Spam-Score: 0.0 (/) X-Scan-Signature: 21c69d3cfc2dd19218717dbe1d974352 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hello Anna, I like your argumentation and I subscribe to your conclusion. Start with = a=20 simple, easy implement solution which may not be perfect and then go on=20 with more complex schemes. A crucial point is the tradeoff of the simple solution. If that simple=20 solution gets complex in standardisation or if there is a "killing=20 criterium", we'd have to drop it. Regards, Ruediger [snipped all but Tina's final question and your response] > C) Since single marking and dual marking don't have compatibility, and = solve the > almost the same problem, do we need to select and only keep one = approach? =20 Anna: We were trying to argue both at the last IETF and in draft-charny = that it=20 may be beneficial to allow both single and dual marking approaches. We = were=20 also arguing that the single-marking can be viewed as an intermediate = step,=20 leading to faster implementation and deployments. We argued that in=20 environments where the tradeoffs associated with single marking are = undesirable=20 or unacceptable, the additional complexity of the dual marking may be = necessary. =20 We argued that with minor changes to the architecture it is possible to = allow=20 both, and argued how transitions from one to another can be achieved. =20 Hope this is helpful, =20 Anna =20 =20 >B. R. >Tina _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 04:16:42 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDFZR-00051N-Hy; Tue, 24 Jul 2007 04:16:41 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDFZQ-00051D-Iv for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 04:16:40 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDFZM-000511-TP for pcn@ietf.org; Tue, 24 Jul 2007 04:16:36 -0400 Received: from tcmail31.telekom.de ([217.6.95.238]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDFZM-0007gW-Ch for pcn@ietf.org; Tue, 24 Jul 2007 04:16:36 -0400 Received: from S4DE8PSAANQ.mitte.t-com.de by tcmail31.telekom.de with ESMTP; Tue, 24 Jul 2007 10:16:34 +0200 Received: from S4DE8PSAAFQ.mitte.t-com.de ([10.151.180.5]) by S4DE8PSAANQ.mitte.t-com.de with Microsoft SMTPSVC(6.0.3790.3959); Tue, 24 Jul 2007 10:16:28 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Tue, 24 Jul 2007 10:16:33 +0200 Message-Id: <6439282641581441A36F7F6F83ED2ED201DB9A3B@S4DE8PSAAFQ.mitte.t-com.de> In-Reply-To: <5.2.1.1.2.20070724004454.056d5cc8@pop3.jungle.bt.co.uk> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt thread-index: AcfNh77JonZcvt9sTLGDrh4Dv+T0vQAQa7zA From: "Geib, Ruediger" To: X-OriginalArrivalTime: 24 Jul 2007 08:16:28.0541 (UTC) FILETIME=[EF4FA2D0:01C7CDCA] X-Spam-Score: -1.0 (-) X-Scan-Signature: 0bc60ec82efc80c84b8d02f4b0e4de22 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Bob, |Two reasons for saying this to the list: |i) Is being less sensitive to accurate traffic matrix=20 | prediction something other operators would be=20 | interested in? |ii) The text needs correcting slightly, because it says=20 | Songhurst's method doesn't use a pre-configured=20 | rate, but it does - it just doesn't have to be=20 | accurate. My argumentation on settable rates came from experience=20 with the Priority Promotion Scheme (PPS, a measurement=20 based admission control scheme), which didn't=20 foresee settable rates and I couldn't convince the=20 authors to introduce them.=20 I don't object to your proposal allowing for less accurate=20 prediction of the traffic matrix. Whatever the resolution=20 is, other PHBs may have to be protected from a capacity=20 breathing PCN class. But that could be done by making sure=20 that PCN traffic shares links with best effort background=20 traffic only too (and just ensuring a minimum capacity=20 for best effort). Regards, Ruediger _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 12:55:21 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDNfM-0004At-PG; Tue, 24 Jul 2007 12:55:20 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDNfL-00044U-6Z for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 12:55:19 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDNfK-00042e-Q5 for pcn@ietf.org; Tue, 24 Jul 2007 12:55:18 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDNfJ-0000Dy-Pj for pcn@ietf.org; Tue, 24 Jul 2007 12:55:18 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 17:55:16 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Date: Tue, 24 Jul 2007 17:55:15 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA50132C123@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-westberg-pcn-load-control-00.txt Thread-Index: Ace3GxtZWDEHRn83T/m3IGeLNeDF2AS8YfSwADNiy3AAACDi8ADNeDH4 References: <467FA562.2060603@ericsson.com> <75A199C5D243C741BF3D3F1EBCEF9BA5019DC344@E03MVZ1-UKDY.domain1.systemhost.net> <001501c7cada$5c8e2810$4c0d5982@dynamic.ewi.utwente.nl> <001601c7cadb$b2a75db0$4c0d5982@dynamic.ewi.utwente.nl> From: To: X-OriginalArrivalTime: 24 Jul 2007 16:55:16.0653 (UTC) FILETIME=[691C95D0:01C7CE13] X-Spam-Score: 0.0 (/) X-Scan-Signature: a743e34ab8eb08259de9a7307caed594 Cc: pcn@ietf.org, Lars.westberg@ericsson.com X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org let me clarify you have only one sort of encoding, which is used for both adm ctrl & = termination (as per charny-pcn-single-marking) =20 the marking algo is based on the excess-rate above some configured = traffic rate on each node. =20 i couldnt work out whether this rate is the configured-admissible-rate = or the configured-termination-rate (to use the terminology of the = architecture draft) =20 i think you may be using the same idea as the single marking draft, ie = assuming that every node in the PCN-domain has the same value for = {admissible-rate / termination-rate} - is this right? =20 thanks phil=20 ________________________________ From: Georgios Karagiannis [mailto:karagian@cs.utwente.nl] Sent: Fri 20/07/2007 15:38 To: Eardley,PL,Philip,CXR9 R Cc: Lars.westberg@ericsson.com; pcn@ietf.org Subject: RE: [PCN] Fwd: I-D = ACTION:draft-westberg-pcn-load-control-00.txt Hi Phil Thank you very much for reading the draft! Please see comments in line! > > ________________________________ > > From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] > Sent: donderdag 19 juli 2007 16:22 > To: Lars.westberg@ericsson.com; pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > =20 > =20 > > Lars > > =20 > > I started reading your draft, but have a couple of > clarification questions about what you're proposing. > > =20 > > As I understand it:- > > * there are two marking algorithms on the interior routers Georgios: Yes you are right! > > * Admission-marking: if the rate exceeds threshold-1, > then all pkts are Adm marked Georgios: Note that here the "encoded DSCP" marking is used. Thus also = in this state the excess-traffic rate is measured and a fraction (1/N) of = the excess rate is Termination (encoded) marked. However, another type of marking could also be used, which is not explicitly described in this document, but is somehow projected in the draft as "notified DSCP" . = Sorry for this! We will clarify this operation in a next version of the draft. For the = time being assume that the "encoded DSCP" marking is used for both admission control and flow termination features. If this is applied then: For both cases the excess-traffic rate is measured and a fraction (1/N) = of the excess rate is Termination (encoded) marked. > > * Termination-marking: if the rate exceeds threshold-2, > the excess-traffic rate is measured and a fraction (1/N) of > the excess rate is Termination marked. Georgios: agree! > =20 > > The adm marking algo is a bit unclear to me, sometimes > it's described as marking all pkts as soon as threshold-1 is > exceeded - sometimes (eg S4.1.3) it seems that a fraction of > the excess traffic is marked (same idea as above under " * > Termination marked"). Which is correct? Georgios: You are right that the text is unclear. When the "encoded = DSCP" marking is used for admission control, then the excess-traffic rate is measured and a fraction (1/N) of the = excess rate is Termination (encoded) marked. We will clarify this in the next version of the draft! > > =20 > > I'm also not sure what "encoded DSCP" and "notified > DSCP" mean. Do they correspond to Admission-marking and > Termination-marking, or do they mean something else? Georgios: the "notified DSCP" is just projected somewhere in the text, = and that is not correct. This marking is related to the scenario that an additional DSCP is = needed for the admission control feature, which is vaguely described in the = draft. For the time being assume that the "encoded DSCP" marking is used for = both admission control and flow termination features. We will clarify this in = the next version of the draft. > =20 > > A point that doesn't just apply to this draft: > > =20 > http://www.watersprings.org/pub/id/draft-briscoe-tsvwg-byte-pk > t-mark-00.txt > which looks at "whether to allow for packet size when the > network codes or when the transport decodes congestion > notification." This draft argues that, when marking, the > packet size should not be taken into account. Georgios: Thank you for the pointer I will read the draft and discuss it during the Chicago IETF meeting! Best regards and see you in Chicago! Georgios > =20 > Thanks > phil > > =20 > > -----Original Message----- > From: Lars Westberg [mailto:Lars.westberg@ericsson.com] > Sent: 25 June 2007 12:22 > To: pcn@ietf.org > Subject: [PCN] Fwd: I-D > ACTION:draft-westberg-pcn-load-control-00.txt > > =20 > > Dear all > =20 > The "LC-PCN - The Load Control PCN solution" draft can > be found via: > =20 > http://www.ietf.org/internet-drafts/draft-westberg-pcn-load-co > ntrol-00.txt > =20 > =20 > Abstract > =20 > There is an increased interest of simple and scalable > resource provisioning > solution for Diffserv network. > The Load Control PCN (LC-PCN) addresses the following issues: > =20 > 1. Admission control for real time data flows in > stateless Diffserv Domains > 2. Flow termination: Termination of flows in case of > exceptional events, > such as severe congestion after re-routing. > Admission control in a Diffserv stateless domain is a > combination > of: > =20 > 1. Probing, whereby a probe packet is > sent along the forwarding path in a network to determine > whether a flow can be admitted based upon the current > congestion state of the network > =20 > 2. Admission control based on data marking, whereby > in congestion > situations the data packets are marked to notify > the egress node > that a congestion occurred on a particular ingress to egress > path. > The scheme provides the capability of controlling > the traffic load in > the network without requiring signaling or any > per-flow processing in > the core routers. The complexity of Load Control is > kept to a minimum > to make implementation simple. > =20 > Kind regards, > =20 > Lars > > > _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 17:05:54 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRZq-0006wP-TH; Tue, 24 Jul 2007 17:05:54 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDRZp-0006wK-VA for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 17:05:53 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRZp-0006wC-CD for pcn@ietf.org; Tue, 24 Jul 2007 17:05:53 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDRZn-00031A-SA for pcn@ietf.org; Tue, 24 Jul 2007 17:05:53 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 22:05:51 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 22:05:51 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185311149770; Tue, 24 Jul 2007 22:05:49 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.21]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6OL5ZX1025783; Tue, 24 Jul 2007 22:05:48 +0100 Message-Id: <5.2.1.1.2.20070724185620.04761020@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Tue, 24 Jul 2007 19:02:29 +0100 To: "Geib, Ruediger" From: Bob Briscoe Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt In-Reply-To: <6439282641581441A36F7F6F83ED2ED201DB9A3B@S4DE8PSAAFQ.mitte .t-com.de> References: <5.2.1.1.2.20070724004454.056d5cc8@pop3.jungle.bt.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -0.624 () ALL_TRUSTED,DATE_IN_PAST_03_06 X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 24 Jul 2007 21:05:51.0227 (UTC) FILETIME=[6A6A84B0:01C7CE36] X-Spam-Score: 1.4 (+) X-Scan-Signature: 4d87d2aa806f79fed918a62e834505ca Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Ruediger, At 09:16 24/07/2007, Geib, Ruediger wrote: >Bob, > >|Two reasons for saying this to the list: >|i) Is being less sensitive to accurate traffic matrix >| prediction something other operators would be >| interested in? >|ii) The text needs correcting slightly, because it says >| Songhurst's method doesn't use a pre-configured >| rate, but it does - it just doesn't have to be >| accurate. > >My argumentation on settable rates came from experience >with the Priority Promotion Scheme (PPS, a measurement >based admission control scheme), which didn't >foresee settable rates and I couldn't convince the >authors to introduce them. > >I don't object to your proposal allowing for less accurate >prediction of the traffic matrix. Whatever the resolution >is, other PHBs may have to be protected from a capacity >breathing PCN class. But that could be done by making sure >that PCN traffic shares links with best effort background >traffic only too (and just ensuring a minimum capacity >for best effort). I agree totally with you that most operators currently prefer to nail up capacaity for each class (usually with borrowing from 'lower' into 'upper'). This fits the current business models and ways that SLAs are written. I just didn't want the PCN architecture to constrain all operators to _not_ have breathing within limits and _only_ have hard limits. Otherwise we are preventing potential new, more flexible business models developing, wihch the IETF should avoid. As long as we can allow this flexibility by avoiding the wording being unnecessarily constraining, I don't think anyone need object, as long as it doesn't make any initial PCN implementations more complex. Cheers Bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 17:05:58 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRZu-0006yV-21; Tue, 24 Jul 2007 17:05:58 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDRZs-0006xe-CA for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 17:05:56 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRZs-0006x2-27 for pcn@ietf.org; Tue, 24 Jul 2007 17:05:56 -0400 Received: from smtp5.smtp.bt.com ([217.32.164.139]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDRZq-00031F-JI for pcn@ietf.org; Tue, 24 Jul 2007 17:05:56 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp5.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 22:05:53 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 22:05:53 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185311152598; Tue, 24 Jul 2007 22:05:52 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.21]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6OL5ZRp025780; Tue, 24 Jul 2007 22:05:51 +0100 Message-Id: <5.2.1.1.2.20070724214148.042b6568@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Tue, 24 Jul 2007 22:05:31 +0100 To: "BLAKE, Steven" , BRADNER Scott From: Bob Briscoe Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 24 Jul 2007 21:05:53.0884 (UTC) FILETIME=[6BFFF1C0:01C7CE36] X-Spam-Score: 0.0 (/) X-Scan-Signature: 7baded97d9887f7a0c7e8a33c2e3ea1b Cc: PCN IETF list Subject: [PCN] How to discuss WG scoping decisions in an RFC? X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Steve, Scott, I'm nearly done writing a review of the PCN architecture. One issue I have is that there's a lot of text in there that I would class as WG process management text. Of two types: i) scoping assumptions that are primarily charter-driven, but difficult to justify believably as assumptions about production networks - other than as a need to bite off part of a problem first, which isn't really a justification that should appear in a standards track RFC ii) refs to docs that the charter requires, but that haven't been written yet, and may not have all been written before the first PCN RFC rolls off the production line. This is natural for the first drafts of a WG, but surely we won't be able to submit RFCs like this. ii) is relatively easy. where refs don't exist yet I assume authors should change all the inline text about planned docs to Editorial Notes, to remind everyone that these need to be added before it can go to RFC. i) is more difficult. My working assumption is that RFCs have to be written to stand separately from the WG and process that created them. They exist for all time and charters change. So is the appropriate style to adopt charter scoping assumptions with suitable text written as if we believe them in their own right, rather than "because the charter says so"? This particularly affects section 3 of draft-eardley-pcn-architecture-00.txt for things like emergency use being out of scope, or to a lesser extent the single-domain assumption. Bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 17:23:38 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRr0-0005Mz-FA; Tue, 24 Jul 2007 17:23:38 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDRqz-0005Mu-3I for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 17:23:37 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRqy-0005Ml-Pj for pcn@ietf.org; Tue, 24 Jul 2007 17:23:36 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDRqx-0003Mt-9v for pcn@ietf.org; Tue, 24 Jul 2007 17:23:36 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 22:23:34 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Date: Tue, 24 Jul 2007 22:23:34 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA50132C127@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: PCN Admission control ECMP and probing Thread-Index: AcfOOOPl8HiGJ2RbRLit496MNY232Q== From: To: X-OriginalArrivalTime: 24 Jul 2007 21:23:34.0621 (UTC) FILETIME=[E43F90D0:01C7CE38] X-Spam-Score: 1.2 (+) X-Scan-Signature: 67c1ea29f88502ef6a32ccec927970f0 Subject: [PCN] PCN Admission control ECMP and probing X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org hi, =20 have been thinking about this. as far as adm ctrl is concerned, i think = the following (copied from babiarz-3sm) applies to PCN in general and = not just that draft: =20 >=20 As an alternative [to measuring markings on data pkts], probing may be = used for admission control. The PCN ingress node generates and sends = probe packets to test and verify the pre-congestion level on the = ingress-egress path. The PCN egress intercepts these probe packets. If = ... [egress makes measurements of probe pkts], the requesting flows are = not admitted (blocked). Probing is useful or even essential under the = following conditions: o when an ingress-egress aggregate carries no traffic, o in the presence of multipath routing, when some paths are already = AR-overloaded, but others are not, and further flows should be admitted = if they use a non-overloaded path. <=20 =20 is something on these lines correct? (and therefore worth adding to the = architecture draft). i think it's correct for all the alternative adm = ctrl mechanisms that have been proposed. =20 in terms of work for the WG, what work does it imply? (1) the WG must define a normal (non-probing) adm ctrl mechanism - based = on making measurements of pkts arriving at an PCN-egress-node from a = particular PCN-ingress-node (ie make measurements for the = ingress-egress-aggregate that the new flow would use).=20 =20 (2) the WG may define a probing-based adm ctrl mechanism. By "may" I = mean: - we could decide to concentrate on (1), and think about probing later - we could decide to think about probing for the first reason given in = the quote above.=20 - we could decide to think about probing for the second reason given in = the quote above=20 =20 The second choice would involve work: - BCP advice for number/rate of probe pkts to send=20 - how to address them (eg address probe pkts to PCN-egress-node) - a mechanism for the PCN-egress-node to recognise this as a probe pkt = (presumably if probe pkts are addressed to the PCN-egress-node, this is = just an ID number) =20 The third choice would involve work: - BCP advice for number/rate of probe pkts to send=20 - probe pkts would just be addressed to the new flow's destination - mechanism for PCN-egress-node to detect a pkt is a probe pkt (partly = so it can make measurements to determine whether to admit the new flow, = partly so it doesn't forward the probe pkt on outside the PCN-domain) - this could be instead of, or in addition to, the 'second choice'. if = it's 'in addition to', then there would have to be a way of deciding = which was the appropriate one to use. =20 =20 As to the need for probing, I don't think we have had a discussion = (evidence from deployment scenarios) whether the two reasons for probing = are common or rare (and therefore how much we should worry about one or = both of the reasons in the short term). Here's a starter scenario: =20 Imagine a core network with 100 PCN-boundary-nodes. Say there are 10 = million end nodes. If we assume evenly distributed topology, then each = ingress-egress-aggregate carries traffic from 1000 end nodes. However, = the end nodes only send data [eg voip] some of the time - say 1% (15mins = a day) on average. This might suggest that most = ingress-egress-aggregates will have traffic on most of the time, so = probing would rarely be required. However in fact the distribution would typically be long-tailed (eg = ingress-egress-aggregate between London and Manchester will always have = lots of traffic, but there'll be other aggregates with not much = traffic). Also if the network was a bit bigger (say 3 times as many = PCN-boundary-nodes) then most ingress-egress-aggregates would need to do = probing. =20 Comments? =20 phil =20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 17:27:56 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRvA-0008NC-IJ; Tue, 24 Jul 2007 17:27:56 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDRv9-0008N6-2H for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 17:27:55 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDRv8-0008My-Oa for pcn@ietf.org; Tue, 24 Jul 2007 17:27:54 -0400 Received: from imr1.ericy.com ([198.24.6.9]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDRv7-0003R3-Eh for pcn@ietf.org; Tue, 24 Jul 2007 17:27:54 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr1.ericy.com (8.13.1/8.13.1) with ESMTP id l6OLWLjw006234; Tue, 24 Jul 2007 16:32:21 -0500 Received: from eusrcmw750.eamcs.ericsson.se ([138.85.77.50]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 16:27:41 -0500 Received: from [127.0.0.1] ([147.117.168.117]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Tue, 24 Jul 2007 16:27:40 -0500 From: Steven Blake To: Bob Briscoe In-Reply-To: <5.2.1.1.2.20070724214148.042b6568@pop3.jungle.bt.co.uk> References: <5.2.1.1.2.20070724214148.042b6568@pop3.jungle.bt.co.uk> Content-Type: text/plain Organization: Ericsson IP Infrastructure Date: Tue, 24 Jul 2007 17:27:40 -0400 Message-Id: <1185312460.3454.53.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 24 Jul 2007 21:27:41.0130 (UTC) FILETIME=[772DDAA0:01C7CE39] X-Spam-Score: 0.0 (/) X-Scan-Signature: 7aafa0432175920a4b3e118e16c5cb64 Cc: PCN IETF list Subject: [PCN] Re: How to discuss WG scoping decisions in an RFC? X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org On Tue, 2007-07-24 at 22:05 +0100, Bob Briscoe wrote: > Steve, Scott, > > I'm nearly done writing a review of the PCN architecture. One issue I have > is that there's a lot of text in there that I would class as WG process > management text. Of two types: > i) scoping assumptions that are primarily charter-driven, but difficult to > justify believably as assumptions about production networks - other than as > a need to bite off part of a problem first, which isn't really a > justification that should appear in a standards track RFC > ii) refs to docs that the charter requires, but that haven't been written > yet, and may not have all been written before the first PCN RFC rolls off > the production line. > > This is natural for the first drafts of a WG, but surely we won't be able > to submit RFCs like this. > > ii) is relatively easy. where refs don't exist yet I assume authors should > change all the inline text about planned docs to Editorial Notes, to remind > everyone that these need to be added before it can go to RFC. > > i) is more difficult. My working assumption is that RFCs have to be written > to stand separately from the WG and process that created them. They exist > for all time and charters change. So is the appropriate style to adopt > charter scoping assumptions with suitable text written as if we believe > them in their own right, rather than "because the charter says so"? > > This particularly affects section 3 of > draft-eardley-pcn-architecture-00.txt for things like emergency use being > out of scope, or to a lesser extent the single-domain assumption. draft-eardley-pcn-architecture-00 is not a working group document. If the authors ask to have this draft approved as a WG document then these are useful comments to raise. Regarding emergency use: the charter says: (D) flows may have different precedence, but the applicability of the PCN mechanisms for emergency use (911, GETS, WPS, MLPP, etc.) is out of scope This could be interpreted in more than one way, but I interpret this as saying that PCN-specific mechanisms will not take flow precedence into account. Which is a different than saying that PCN cannot be used with flow setup protocols/mechanisms that take flow precedence into account. Regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 19:44:33 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDU3N-0003qo-A0; Tue, 24 Jul 2007 19:44:33 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDU3M-0003qY-F1 for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 19:44:32 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDU3M-0003p3-09 for pcn@ietf.org; Tue, 24 Jul 2007 19:44:32 -0400 Received: from smtp3.smtp.bt.com ([217.32.164.138]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDU3K-0001Ez-9R for pcn@ietf.org; Tue, 24 Jul 2007 19:44:31 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp3.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 00:44:29 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 00:44:29 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185320668434; Wed, 25 Jul 2007 00:44:28 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.7]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6ONiHbR026772; Wed, 25 Jul 2007 00:44:24 +0100 Message-Id: <5.2.1.1.2.20070724140627.03c06a58@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Wed, 25 Jul 2007 00:44:14 +0100 To: From: Bob Briscoe Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA5019DC2D7@E03MVZ1-UKDY.doma in1.systemhost.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 24 Jul 2007 23:44:29.0046 (UTC) FILETIME=[937A7160:01C7CE4C] X-Spam-Score: 0.0 (/) X-Scan-Signature: 8a4bcf8f67063cac573319207fe3db35 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Phil and all the authors of this PCN architecture draft, Like Lars, I'd like to congratulate you all on such a mature first draft, and on managing to encompass many different views we have seen from various people without making the thing an uncontrollable monster full of options and choices. I just read it all through and my review comments are given below. Also see for suggested minor text changes. I haven't supplied text for more major changes inline below until the authors agree with the need for change. But then I can supply text if required. At 16:59 28/06/2007, philip.eardley@bt.com wrote: >Hi all, > >Just a reminder that all comments on this draft would be great. It aims >to describe the PCN architecture, in light of the PCN WG's Charter & its >Milestone of an Info doc on 'Flow Admission and Termination Architecture >within a Diffserv Domain' (due Nov 07). General comments: * WG process management A lot of WG process management text, esp in S.3, but also the list of possible flow termination mechanisms in S.4. All instances hilited in magenta in the review at the above URL. See separate mail about this to the PCN WG chairs (cc PCN list) Subject: How to discuss WG scoping decisions in an RFC? * Choices vs decisions I believe an architecture doc should say where one decision is required or where multiple options are reasonable. Currently, the arch is good at laying out the design space, but I'd like us to try to say which choices have to be made by the IETF, which should be left to vendors and which left to operators. >S1 Introduction. >This is quite short. If desired, it could be boosted with a general >explanation of where PCN fits into the picture of QoS and how it's >evolved (compare Section 1.1 of draft-chan-pcn-problem-statement-01) * Clarify that a packet might encounter more than one PCN domain along its path, each being a separate admission control hop. * Clarify that a "Diffserv domain" may be multiple concatenated autonomous systems, but in this draft they are assumed to trust each other and have identical configuration. >S2 Terminology >In the "Editor's note" are 3 alternative terms that some of the authors >preferred. * ECN _and_ PCN marking? " o Configured-termination-rate: [...] Normally it is configured to be less than the maximum rate at which PCN-traffic can be forwarded on the link, so that termination-marking occurs before any significant queuing, ECN-marking or loss of PCN-packets. " The above text implies (to me) that a PCN-interior router might do PCN marking _and_ also ECN marking just before drop. That also imposes a requirement on the encoding to be able to carry either in the same field. I don't think the authors meant either of these implications. So somewhere, the relation between PCN & ECN marking should be stated. Although this is perhaps too detailed for the architecture, I suggest that any need for ECN marking on the same path but outside the PCN domain(s) should be handled by tunnelling across the PCN domain, with a non-PCN DSCP in the inner header (that turns on the RFC3168 meaning of its ECN field) and a PCN DSCP in the outer. * Marking is when "current" rate is "above" a reference rate? " o Admission-marking: the marking of PCN-packets by a PCN-node to indicate that the PCN-traffic on a link is above the configured- admissible-rate. o Termination-marking: the marking of PCN-packets by a PCN-node to indicate that the PCN-traffic on a link is above the configured- termination-rate. " These marking definitions and other examples hilighted in magenta in the above PDF prejudge marking mechanisms as rate measurements. We don't just have marking when the _current_rate is _above_ the reference rate. We can have marking when the _current_ rate is _below_, or when the _past_ rate was _above_. The configured rates are parameters of a (to be defined) mechanism. These mechanisms will not have to mark packets when the rate is above these configured rates. That depends on the mechanism. This sounds picky, but it's actually a big rant I have about all this loose discussion of rate (yes, the issue of what rate means is mentioned in the draft, but we need to be careful about such sloppy usage). IMHO, it's important to scale our conception of time down to inter-arrival times, to be precise. Then the rate is packet size/interarrival time. Therefore seen at a small enough timescale, rate might be varying rapidly above and below the configured rate. A marking mechanism could be implemented by a virtual queue rather than a rate measurement. When the offered instantaneous rate has been below the configured-admission-rate for many packets (perhaps hundreds), marking will and should still occur,... if the virtual queue is still above a marking threshold even if it is emptying rather than filling. This can be a deliberate design choice that says we still want admission marking when there has been recent overload to allow time for the control loop to work. It ensures a greater safety margin is automatically created by the marking mechanism when recent traffic had higher variance. This was the marking algorithm that was most studied and simulated in CL-PHB draft. The unintended implication that all packets are either marked or not marked should also be carefully avoided. The draft needs to say explicitly that "Admission (or Termination) marking will be an encoding of some combination of codepoints in the IP header to signal a varying fractional number from a path of PCN-interior-nodes to a PCN-egress-node" * inelastic Do you think we should define "inelastic" or is this a well-known IETF term? We could refer to [Shenker95], which I think was the first to define the term. Or is there an RFC that defines this (hopefully with ref to Shenker)? Scott Shenker, "Fundamental Design Issues for the Future Internet", In: IEEE Journal on Selected Areas in Communications 13 (7) pp. 1176--1188 (1995). >S3 Assumptions and constraints on scope >These are the 4 things mentioned in the Charter, plus some explanation >of them. Are they clear? Also we mention some of the ways that a future >revised Charter might look at overcoming some of the >constraints/assumptions; is this sub-section at the right depth? * Are all the scoping assumptions equal relaxable? Just a thought: might it be worth giving an indication of which assumptions are likely to be hard or impossible to relax and which not (e.g. I think the aggregation assumption is implicit to all MBAC (measurement-based Adm Ctrl). Also inelasticity is fairly fundamental - you don't need admission control if flows aren't inelastic. This would affect the last para, which implies all the assumptions might be relaxed one day. >S4 High-level functional architecture >We have tried to write this section (and the following ones) so that it >fits all the various proposals there've been for PCN mechanisms. Does >this make the section too wishy-washy or too hard to understand? Should >it include some comparison of the different mechanisms proposed >(PCN-interior-node marking algorithms & PCN-boundary-node reactions)? * Functional or topological? Is it intentional that the high level functions are classified by which type of node does them in 3 cases and what function is to be done in the others? Would it be possible to define functions in the abstract first, then say which functions have to be implemented on certain types of nodes? Or does this just make it unnecessarily incomprehensible? Gaps: 1/ Discuss which PCN node needs to know the IP address of which other PCN node in different configurations. And state requirements this implies on the signalling protocol, or on configuration. Minimally, only the egress needs to know the ingress address. In centralised admission control scenarios, either the egress or the ingress or both might need to be configured with a central address. 2/ Related to knowing addresses of other nodes: When a PCN node receives a message claiming to be from another PCN node, to validate the msg is indeed from the node it claims to be, are there any different issues that PCN raises relative to typical reservation signalling systems? draft-lefaucheur-rsvp-ecn-01 (expired) contains a good deal of text on this issue that should be generalised into this arch doc. >S5 Detailed Functional architecture >Is this a reasonable description of the extra functionality that PCN >requires on various nodes in the PCN-domain? Is it the right way to >split up the description? For clarity / help reader's understanding, >should there be some specific examples of how functionality might be >distributed (eg "if you followed the deployment model in >draft-briscoe-tsvwg-cl-architecture-04, then this measurement is made at >the PCN-egress-node, communicated to the PCN-ingress-nodes which makes >the admission decision; etc.") S.5.5 Probing functions If we are going to consider a case where the ingress has prior knowledge of which egress is associated with which destination address (e.g. with a separate signalling routing table as discussed in NSIS, or if the signalling protocol goes receiver-sender-receiver), then the ingress could know that it has no reservations with that egress as soon as a reservation request arrives, so it can unilaterally start probling. S.5.6 Flow Termination Functions The text seems to assume the egress makes the decision on which flows to lose and tells the ingress. In cl-architecture (for instance) the egress meters, feeds back the measurement to the ingress, which meters the load it is forwarding and then the ingress calculates how much traffic to terminate, and either chooses the flows itself, or asks a central node to choose. I think there has to be metering at both boundaries otherwise we can't work out how much traffic has been dropped (as well as termination marked). The decision might be at either (but in cl-architecture we had good reasons for choosing the ingress because it has the most recent knowledge about load (given flows might be being abandoned by users very quickly and/or added very quickly during a disaster). Other more incremental mechanisms have now been defined that don't calculate how much load to shed in one pass, but keep trying. Have we abandonned the earlier approach? Whatever, I think a feedback function is missing between the boundary nodes. >S6 Design goals and challenges >This briefly describes some open issues, taken from >briscoe-tsvwg-cl-architecture. Are there other ones that should be >mentioned? Is the problem description at the right level of depth? >Should we discuss various possible solutions to these problems? I get the feeling we need a doc specifically on ECMP solutions? >S7 Deployment scenarios >Briefly describes some deployment scenarios for pcn? is this at the >right level of depth? Just a thought - I felt this section would have been better earlier. >S8 Operations and Management >This section was written in response to the Charter saying that the >architecture document should include security, manageability and >operational considerations. The draft addresses this by providing some >thoughts under the FCAPS headings: OAM of Faults, Configuration, >Accounting, Performance and Security? Is this the right way of >structuring it - does it cover the right set of topics? Is the text at >the right level? - eg should it also have a detailed set of parameters >that would be available for configuration? * Don't think this is Fault OAM? Echoing what someone else (I forget who) said on the list, Fault OAM isn't really about how the control system recovers from failures (that's control), it's how to tell the management system/manual operator that you have recovered from a failure (or not). Also, we should cover faults other than node or link failures. E.g. a wrongly configured address in a node, or a wrong address given in a singalling protocol, or a wrongly configured parameter in a queueing algo. Etc. * Config OAM: Add: - level of AM that leads to denying new admissions. - config paramteres that control distribution of functions? * Don't think this is Performance OAM? I think Perf OAM is about monitoring performance at run-time, not characterising performance at design time. * Don't think this is Security OAM? Again, as someone said, security OAM is finding out about security breaches or near-misses at run-time, not identifying security flaws in the design, which is security the considerations section. * Security Considerations Gaps: - PCN marking selectively applied to certain flows, rather than randomly by interior node. - The statement about DoS attacks is a requirement with no pointers to the detailed DOS issues, or any discussion of best practice design. I could supply text here (among many other things to do!) - ref to hop-by-hop signalling authentication [RFC2747 for RSVP] and the new recently posted draft to tsvwg on group keying for RSVP authentication . I haven't read it yet, but on a scan it's as relevant as RFC2747. Phew... that's all for now. Bob >An overall question is whether the draft should have more comparison of >the options (pros/cons) for various aspects. > >I aim to edit another version of the draft before the ietf (but maybe >not before the deadline as I'm on hols next week). > >Thanks! >Phil/ ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 24 20:03:04 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDULI-0001YG-Dc; Tue, 24 Jul 2007 20:03:04 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDULH-0001YA-AP for pcn-confirm+ok@megatron.ietf.org; Tue, 24 Jul 2007 20:03:03 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDULH-0001Y2-0b for pcn@ietf.org; Tue, 24 Jul 2007 20:03:03 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDULF-0006Ff-Hl for pcn@ietf.org; Tue, 24 Jul 2007 20:03:02 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 01:03:01 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 01:03:00 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185321779445; Wed, 25 Jul 2007 01:02:59 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.7]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6P02t1f026944; Wed, 25 Jul 2007 01:02:58 +0100 Message-Id: <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Wed, 25 Jul 2007 01:03:06 +0100 To: From: Bob Briscoe Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 25 Jul 2007 00:03:00.0270 (UTC) FILETIME=[29D1C4E0:01C7CE4F] X-Spam-Score: 0.0 (/) X-Scan-Signature: e5ba305d0e64821bf3d8bc5d3bb07228 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Phil & other authors, Just thought of one more possible gap: Another bullet for the Intro: o QoS reservations are decoupled from routing system (within the PCN domain). I.e. admission control lays reserved traffic over routes given by the routing system without any pinning. Then if any of capacity, routing or topology changes, the routing system just moves all traffic, so reserved flows that can gracefully continue after a short disruption will do. We don't trigger any messages from the routing system to the QoS system to say routing has changed. So we don't have to deal with losing these messages during disastrous events, or with authenticating such messages. [Of course, then, if there isn't enough capacity for the previously admitted traffic after - both a capacity, routing or topology change - and after the routing and protection system has had a chance to bring in new capacity or re-arrange the routing to fit, then flow termination can bring the system back below its max operating point.] Bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 05:17:17 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDczd-00031D-F2; Wed, 25 Jul 2007 05:17:17 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDczc-000318-8l for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 05:17:16 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDczY-00030x-Lg for pcn@ietf.org; Wed, 25 Jul 2007 05:17:12 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDczX-0001kA-2l for pcn@ietf.org; Wed, 25 Jul 2007 05:17:12 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 289766FAE; Wed, 25 Jul 2007 11:17:08 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 1B03F6FB4; Wed, 25 Jul 2007 11:17:08 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id C78686FB5; Wed, 25 Jul 2007 11:17:07 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6P9H7h01208; Wed, 25 Jul 2007 11:17:07 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 70E466F591; Wed, 25 Jul 2007 11:11:17 +0200 (CEST) Message-ID: <46A7144B.1010503@informatik.uni-wuerzburg.de> Date: Wed, 25 Jul 2007 11:13:47 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Steven Blake Subject: Re: [PCN] Re: How to discuss WG scoping decisions in an RFC? References: <5.2.1.1.2.20070724214148.042b6568@pop3.jungle.bt.co.uk> <1185312460.3454.53.camel@neutrino> In-Reply-To: <1185312460.3454.53.camel@neutrino> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: f66b12316365a3fe519e75911daf28a8 Cc: PCN IETF list X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Steven Blake wrote: > On Tue, 2007-07-24 at 22:05 +0100, Bob Briscoe wrote: > > >> Steve, Scott, >> >> I'm nearly done writing a review of the PCN architecture. One issue I have >> is that there's a lot of text in there that I would class as WG process >> management text. Of two types: >> i) scoping assumptions that are primarily charter-driven, but difficult to >> justify believably as assumptions about production networks - other than as >> a need to bite off part of a problem first, which isn't really a >> justification that should appear in a standards track RFC >> ii) refs to docs that the charter requires, but that haven't been written >> yet, and may not have all been written before the first PCN RFC rolls off >> the production line. >> >> This is natural for the first drafts of a WG, but surely we won't be able >> to submit RFCs like this. >> >> ii) is relatively easy. where refs don't exist yet I assume authors should >> change all the inline text about planned docs to Editorial Notes, to remind >> everyone that these need to be added before it can go to RFC. >> >> i) is more difficult. My working assumption is that RFCs have to be written >> to stand separately from the WG and process that created them. They exist >> for all time and charters change. So is the appropriate style to adopt >> charter scoping assumptions with suitable text written as if we believe >> them in their own right, rather than "because the charter says so"? >> >> This particularly affects section 3 of >> draft-eardley-pcn-architecture-00.txt for things like emergency use being >> out of scope, or to a lesser extent the single-domain assumption. >> > > draft-eardley-pcn-architecture-00 is not a working group document. If > the authors ask to have this draft approved as a WG document then these > are useful comments to raise. > > Regarding emergency use: the charter says: > > (D) flows may have different precedence, but the applicability > of the PCN mechanisms for emergency use (911, GETS, WPS, > MLPP, etc.) is out of scope > > This could be interpreted in more than one way, but I interpret this as > saying that PCN-specific mechanisms will not take flow precedence into > account. Which is a different than saying that PCN cannot be used with > flow setup protocols/mechanisms that take flow precedence into account. > As soon as we have multiple PCN classes it might be useful to think about flow precedence especially with regard to admission and termination priority. Equal treatment of flows means that a highly critical telemedicine application has the same probability to be terminated as a "relatively" uncritcical VoIP call in case of a disaster. I read the passage in the way that it's not our job to define mechanisms for emergency use, but it is not prohibited to extend PCN towards multiple classes with different requirements although this is not the first thing to do. Regards, Michael > > Regards, > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > Steven Blake > Ericsson/Redback Networks +1 919-472-9913 > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 05:30:59 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDdCt-0003L5-49; Wed, 25 Jul 2007 05:30:59 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDdCr-0003Kx-MM for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 05:30:57 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDdCr-0003Kp-CW for pcn@ietf.org; Wed, 25 Jul 2007 05:30:57 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDdCq-0002A2-H0 for pcn@ietf.org; Wed, 25 Jul 2007 05:30:57 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 1D7D262AE; Wed, 25 Jul 2007 11:30:54 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 100126C22; Wed, 25 Jul 2007 11:30:54 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id D3C1362AE; Wed, 25 Jul 2007 11:30:53 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6P9Urh01384; Wed, 25 Jul 2007 11:30:53 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 6E8A36F591; Wed, 25 Jul 2007 11:25:03 +0200 (CEST) Message-ID: <46A71785.101@informatik.uni-wuerzburg.de> Date: Wed, 25 Jul 2007 11:27:33 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Bob Briscoe Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt References: <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> In-Reply-To: <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 52f7a77164458f8c7b36b66787c853da Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Bob, yes, that's a good point to add to the key benefits of the PCN architecture: It proposes a "resilience admission control" system: admitted flows can survive failures without additional signaling. This differentiates the PCN approach from many other AC methods. It is a consequence of the stateless core and, therefore, it fits well as second bullet. http://tools.ietf.org/id/draft-eardley-pcn-architecture-00.txt Regards, Michael Bob Briscoe wrote: > Phil & other authors, > > Just thought of one more possible gap: > > Another bullet for the Intro: > > o QoS reservations are decoupled from routing system (within the PCN > domain). I.e. admission control lays reserved traffic over routes > given by the routing system without any pinning. Then if any of > capacity, routing or topology changes, the routing system just moves > all traffic, so reserved flows that can gracefully continue after a > short disruption will do. We don't trigger any messages from the > routing system to the QoS system to say routing has changed. So we > don't have to deal with losing these messages during disastrous > events, or with authenticating such messages. > > [Of course, then, if there isn't enough capacity for the previously > admitted traffic after > - both a capacity, routing or topology change > - and after the routing and protection system has had a chance to > bring in new capacity or re-arrange the routing to fit, > then flow termination can bring the system back below its max > operating point.] > > > Bob > > > ____________________________________________________________________________ > > Bob Briscoe, Networks Research Centre, BT > Research > B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 > 645196 > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 05:34:47 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDdGZ-0007FK-Hn; Wed, 25 Jul 2007 05:34:47 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDdGZ-0007FF-5s for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 05:34:47 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDdGY-0007F7-Ou for pcn@ietf.org; Wed, 25 Jul 2007 05:34:46 -0400 Received: from szxga01-in.huawei.com ([61.144.161.53]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDdGW-0006O3-Nb for pcn@ietf.org; Wed, 25 Jul 2007 05:34:46 -0400 Received: from huawei.com (szxga01-in [172.24.2.3]) by szxga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JLQ00JP7AKV6L@szxga01-in.huawei.com> for pcn@ietf.org; Wed, 25 Jul 2007 17:34:08 +0800 (CST) Received: from huawei.com ([172.24.1.24]) by szxga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JLQ00FO4AKR18@szxga01-in.huawei.com> for pcn@ietf.org; Wed, 25 Jul 2007 17:34:07 +0800 (CST) Received: from y49667 ([10.111.12.75]) by szxml04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JLQ00L3WAKNUC@szxml04-in.huawei.com> for pcn@ietf.org; Wed, 25 Jul 2007 17:34:02 +0800 (CST) Date: Wed, 25 Jul 2007 17:33:58 +0800 From: Delei Yu Subject: [PCN] could multicast service be supported in a PCN domain? To: pcn@ietf.org Message-id: <000001c7ce9e$eddd5ad0$4b0c6f0a@china.huawei.com> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Office Outlook 11 Thread-index: AcfOnu19Zd2bEBfoS22P6lRefMVviw== X-Spam-Score: 0.0 (/) X-Scan-Signature: e16ffb81c108f82daea41b8c467b6325 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0172259568==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============0172259568== Content-type: multipart/alternative; boundary="Boundary_(ID_ZYdBXUd04bpOz9UZbag4Ew)" This is a multi-part message in MIME format. --Boundary_(ID_ZYdBXUd04bpOz9UZbag4Ew) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT PCNers, Is it possible for multicast service to be supported in a PCN domain? PCN charter hasn't covered this. So this is just a question for question. -:) --Boundary_(ID_ZYdBXUd04bpOz9UZbag4Ew) Content-type: text/html; charset=us-ascii Content-transfer-encoding: 7BIT

PCNers,

Is it possible for multicast service to be supported in a PCN domain? PCN charter hasn’t covered this. So this is just a question for question. -:)

 

--Boundary_(ID_ZYdBXUd04bpOz9UZbag4Ew)-- --===============0172259568== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0172259568==-- From pcn-bounces@ietf.org Wed Jul 25 05:44:11 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDdPf-0003NS-G6; Wed, 25 Jul 2007 05:44:11 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDdPd-0003NL-Tz for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 05:44:09 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDdPd-0003NC-I6 for pcn@ietf.org; Wed, 25 Jul 2007 05:44:09 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDdPc-0006cb-Dw for pcn@ietf.org; Wed, 25 Jul 2007 05:44:09 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 70F93779B; Wed, 25 Jul 2007 11:44:07 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 6417F7810; Wed, 25 Jul 2007 11:44:07 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 335B2779B; Wed, 25 Jul 2007 11:44:07 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6P9i7h01569; Wed, 25 Jul 2007 11:44:07 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id D34456F591; Wed, 25 Jul 2007 11:38:16 +0200 (CEST) Message-ID: <46A71A9F.2000007@informatik.uni-wuerzburg.de> Date: Wed, 25 Jul 2007 11:40:47 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: philip.eardley@bt.com Subject: Re: [PCN] PCN Admission control ECMP and probing References: <75A199C5D243C741BF3D3F1EBCEF9BA50132C127@E03MVZ1-UKDY.domain1.systemhost.net> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA50132C127@E03MVZ1-UKDY.domain1.systemhost.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 1.2 (+) X-Scan-Signature: 6ba8aaf827dcb437101951262f69b3de Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Phil, see my comments inline! philip.eardley@bt.com wrote: > hi, > > > > have been thinking about this. as far as adm ctrl is concerned, i think the following (copied from babiarz-3sm) applies to PCN in general and not just that draft: > > > > > > As an alternative [to measuring markings on data pkts], probing may be used for admission control. The PCN ingress node generates and sends probe packets to test and verify the pre-congestion level on the ingress-egress path. The PCN egress intercepts these probe packets. If ... [egress makes measurements of probe pkts], the requesting flows are not admitted (blocked). Probing is useful or even essential under the following conditions: > > o when an ingress-egress aggregate carries no traffic, > o in the presence of multipath routing, when some paths are already AR-overloaded, but others are not, and further flows should be admitted if they use a non-overloaded path. > > < > > > > is something on these lines correct? (and therefore worth adding to the architecture draft). i think it's correct for all the alternative adm ctrl mechanisms that have been proposed. > > > > in terms of work for the WG, what work does it imply? > > (1) the WG must define a normal (non-probing) adm ctrl mechanism - based on making measurements of pkts arriving at an PCN-egress-node from a particular PCN-ingress-node (ie make measurements for the ingress-egress-aggregate that the new flow would use). > > > > (2) the WG may define a probing-based adm ctrl mechanism. By "may" I mean: > > - we could decide to concentrate on (1), and think about probing later > > - we could decide to think about probing for the first reason given in the quote above. > > - we could decide to think about probing for the second reason given in the quote above > > I find it useful to identify various mechanisms and assessing them with respect to (a) their ability to address the different needs and (b) their complexity from an operational and (c) protocol point of view. I would not favor seeking and exploring only a single solution which is able to cover a minimum functionality when a more powerful solution is hardly more complex. Having an overview of several possibilities and their pros and cons makes a good decision easier. Probably different PCN approaches (single/dual marking, measurement/token bucket based marking, ECMP-capable/-non-capable...) require different / adapted probing methods. In turn, the simplicity and capabilities of the probing mechanisms can provide another aspect for the assessment of the different PCN approaches. > > > The second choice would involve work: > > - BCP advice for number/rate of probe pkts to send > This heavily depends on the marking mechanism. If the marking provides a "strong" signal, i.e., all packets are marked when the admissible rate is exceeded, one or a few packets suffice for probing. If the marking provides a "weak" signal, i.e., the marker starts marking proportionally to the observed rate when the admissible rate is exceeded, many probe packets are required since only a fraction of PCN packets is marked. > - how to address them (eg address probe pkts to PCN-egress-node) > > - a mechanism for the PCN-egress-node to recognise this as a probe pkt (presumably if probe pkts are addressed to the PCN-egress-node, this is just an ID number) > > > > The third choice would involve work: > > - BCP advice for number/rate of probe pkts to send > > - probe pkts would just be addressed to the new flow's destination > > - mechanism for PCN-egress-node to detect a pkt is a probe pkt (partly so it can make measurements to determine whether to admit the new flow, partly so it doesn't forward the probe pkt on outside the PCN-domain) > > - this could be instead of, or in addition to, the 'second choice'. if it's 'in addition to', then there would have to be a way of deciding which was the appropriate one to use. > > > Phil, your analysis nicely shows that the challenge about probing is to design it in such a way that it works with ECMP, i.e., that probe packets take the same path as future data packets of the requesting flow. In that case the IP header of the probe packets requires the source and destination address of the requesting flow and probe packets need to be intercepted at the PCN egress since the PCN egress is not the destination of the probe packets. This is a challenge from an encoding point of view and needs some analysis how it can be achieved in an elegant way such that no header fields are changed that are used for hash-based ECMP load balancing. Summarizing, I think ECMP-compatible probing is easy from an operational point of view, but it is not trivial from an encoding and protocol point of view. But that's the challenge and I am sure that solutions can be found. > > > As to the need for probing, I don't think we have had a discussion (evidence from deployment scenarios) whether the two reasons for probing are common or rare (and therefore how much we should worry about one or both of the reasons in the short term). Here's a starter scenario: > > > > Imagine a core network with 100 PCN-boundary-nodes. Say there are 10 million end nodes. If we assume evenly distributed topology, then each ingress-egress-aggregate carries traffic from 1000 end nodes. However, the end nodes only send data [eg voip] some of the time - say 1% (15mins a day) on average. This might suggest that most ingress-egress-aggregates will have traffic on most of the time, so probing would rarely be required. > > However in fact the distribution would typically be long-tailed (eg ingress-egress-aggregate between London and Manchester will always have lots of traffic, but there'll be other aggregates with not much traffic). Also if the network was a bit bigger (say 3 times as many PCN-boundary-nodes) then most ingress-egress-aggregates would need to do probing. > > Phil, I think your example shows very well that a probing mechanism is something good to have although it is not always in use. In fact, we want to do as much as possible without probing, but it is good to have such a mechanism for cases where it is needed. Regards, Michael > > > Comments? > > > > phil > > > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 08:12:26 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDfj7-0001NX-IR; Wed, 25 Jul 2007 08:12:25 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDfj6-0001NS-4E for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 08:12:24 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDfj5-0001ND-Ny for pcn@ietf.org; Wed, 25 Jul 2007 08:12:23 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDfj4-0001uJ-FU for pcn@ietf.org; Wed, 25 Jul 2007 08:12:23 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 13:12:21 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 13:12:21 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185365540633; Wed, 25 Jul 2007 13:12:20 +0100 Received: from mut.jungle.bt.co.uk ([10.86.16.145]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6PCCDfR000745; Wed, 25 Jul 2007 13:12:18 +0100 Message-Id: <5.2.1.1.2.20070725125353.04b36f20@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Wed, 25 Jul 2007 13:12:28 +0100 To: Steven Blake , menth@informatik.uni-wuerzburg.de From: Bob Briscoe Subject: Re: [PCN] Re: How to discuss WG scoping decisions in an RFC? In-Reply-To: <46A7144B.1010503@informatik.uni-wuerzburg.de> References: <1185312460.3454.53.camel@neutrino> <5.2.1.1.2.20070724214148.042b6568@pop3.jungle.bt.co.uk> <1185312460.3454.53.camel@neutrino> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 25 Jul 2007 12:12:21.0361 (UTC) FILETIME=[0D765610:01C7CEB5] X-Spam-Score: 0.0 (/) X-Scan-Signature: 5d7a7e767f20255fce80fa0b77fb2433 Cc: PCN IETF list X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Steve & Michael (responses to both inline), At 10:13 25/07/2007, Michael Menth wrote: >Steven Blake wrote: >>On Tue, 2007-07-24 at 22:05 +0100, Bob Briscoe wrote: >> >> >>>Steve, Scott, >>> >>>I'm nearly done writing a review of the PCN architecture. One issue I >>>have is that there's a lot of text in there that I would class as WG >>>process management text. Of two types: >>>i) scoping assumptions that are primarily charter-driven, but difficult >>>to justify believably as assumptions about production networks - other >>>than as a need to bite off part of a problem first, which isn't really a >>>justification that should appear in a standards track RFC >>>ii) refs to docs that the charter requires, but that haven't been >>>written yet, and may not have all been written before the first PCN RFC >>>rolls off the production line. >>> >>>This is natural for the first drafts of a WG, but surely we won't be >>>able to submit RFCs like this. >>> >>>ii) is relatively easy. where refs don't exist yet I assume authors >>>should change all the inline text about planned docs to Editorial Notes, >>>to remind everyone that these need to be added before it can go to RFC. >>> >>>i) is more difficult. My working assumption is that RFCs have to be >>>written to stand separately from the WG and process that created them. >>>They exist for all time and charters change. So is the appropriate style >>>to adopt charter scoping assumptions with suitable text written as if we >>>believe them in their own right, rather than "because the charter says so"? >>> >>>This particularly affects section 3 of >>>draft-eardley-pcn-architecture-00.txt for things like emergency use >>>being out of scope, or to a lesser extent the single-domain assumption. >>> >> >>draft-eardley-pcn-architecture-00 is not a working group document. If >>the authors ask to have this draft approved as a WG document then these >>are useful comments to raise. Steve, I think you might have misunderstood my intent. I'm asking for advice on how to write a good I-D. All I-Ds should be written with the intent of becoming WG items. I don't think there's any need to only answer this question after an I-D becomes a WG item. If anyone is writing an RFC without the intent for it to become and RFC, then it deserves to be ignored. >>Regarding emergency use: the charter says: >> >> (D) flows may have different precedence, but the applicability >> of the PCN mechanisms for emergency use (911, GETS, WPS, >> MLPP, etc.) is out of scope >> >>This could be interpreted in more than one way, but I interpret this as >>saying that PCN-specific mechanisms will not take flow precedence into >>account. Which is a different than saying that PCN cannot be used with >>flow setup protocols/mechanisms that take flow precedence into account. >> > >As soon as we have multiple PCN classes it might be useful to think about >flow precedence especially with regard to admission and termination >priority. Equal treatment of flows means that a highly critical >telemedicine application has the same probability to be terminated as a >"relatively" uncritcical VoIP call in case of a disaster. I read the >passage in the way that it's not our job to define mechanisms for >emergency use, but it is not prohibited to extend PCN towards multiple >classes with different requirements although this is not the first thing to do. Michael, just to warn against your use of the word 'extend' PCN. For the avoidance of doubt, I think Steve's saying it is NOT in scope to extend PCN towards multiple classes with different requirements, but it is in scope for PCN to use (ie refer out to) other mechanisms that satisfy different emergency reqs, and similarly I guess it would be in scope to prove PCN doesn't stop these other mechanisms working. If I'm right, the txt in this arch draft is misleading and should be changed. The _applicability_ of PCN mechs for emergency use is in scope, but PCN-specific mechs for emergency use are out of scope. Bob >Regards, > > Michael > >> >>Regards, >> >>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >>Steven Blake >>Ericsson/Redback Networks +1 919-472-9913 >> >> >> >>_______________________________________________ >>PCN mailing list >>PCN@ietf.org >>https://www1.ietf.org/mailman/listinfo/pcn >> > >-- >Dr. Michael Menth, Assistant Professor >University of Wuerzburg, Institute of Computer Science >Am Hubland, D-97074 Wuerzburg, Germany, room B206 >phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 >mailto:menth@informatik.uni-wuerzburg.de >http://www3.informatik.uni-wuerzburg.de/research/ngn ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 08:58:22 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDgRa-0005nQ-02; Wed, 25 Jul 2007 08:58:22 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDgRZ-0005nL-Cu for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 08:58:21 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDgRZ-0005nD-3G for pcn@ietf.org; Wed, 25 Jul 2007 08:58:21 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDgRX-0006xe-Hc for pcn@ietf.org; Wed, 25 Jul 2007 08:58:21 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id F282F6520; Wed, 25 Jul 2007 14:58:16 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id E50756DE4; Wed, 25 Jul 2007 14:58:16 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id BC5AC6520; Wed, 25 Jul 2007 14:57:36 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6PCvah04090; Wed, 25 Jul 2007 14:57:36 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 453AE6F591; Wed, 25 Jul 2007 14:51:46 +0200 (CEST) Message-ID: <46A747F8.30704@informatik.uni-wuerzburg.de> Date: Wed, 25 Jul 2007 14:54:16 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Bob Briscoe Subject: Multiple PCN classes (was: Re: [PCN] Re: How to discuss WG scoping decisions in an RFC?) References: <1185312460.3454.53.camel@neutrino> <5.2.1.1.2.20070724214148.042b6568@pop3.jungle.bt.co.uk> <1185312460.3454.53.camel@neutrino> <5.2.1.1.2.20070725125353.04b36f20@pop3.jungle.bt.co.uk> In-Reply-To: <5.2.1.1.2.20070725125353.04b36f20@pop3.jungle.bt.co.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: a7d2e37451f7f22841e3b6f40c67db0f Cc: PCN IETF list X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Bob, Bob Briscoe wrote: >>> Regarding emergency use: the charter says: >>> >>> (D) flows may have different precedence, but the applicability >>> of the PCN mechanisms for emergency use (911, GETS, WPS, >>> MLPP, etc.) is out of scope >>> >>> This could be interpreted in more than one way, but I interpret this as >>> saying that PCN-specific mechanisms will not take flow precedence into >>> account. Which is a different than saying that PCN cannot be used with >>> flow setup protocols/mechanisms that take flow precedence into account. >>> >> >> As soon as we have multiple PCN classes it might be useful to think >> about flow precedence especially with regard to admission and >> termination priority. Equal treatment of flows means that a highly >> critical telemedicine application has the same probability to be >> terminated as a "relatively" uncritcical VoIP call in case of a >> disaster. I read the passage in the way that it's not our job to >> define mechanisms for emergency use, but it is not prohibited to >> extend PCN towards multiple classes with different requirements >> although this is not the first thing to do. > > Michael, just to warn against your use of the word 'extend' PCN. > > For the avoidance of doubt, I think Steve's saying it is NOT in scope > to extend PCN towards multiple classes with different requirements, > but it is in scope for PCN to use (ie refer out to) other mechanisms > that satisfy different emergency reqs, and similarly I guess it would > be in scope to prove PCN doesn't stop these other mechanisms working. > > If I'm right, the txt in this arch draft is misleading and should be > changed. The _applicability_ of PCN mechs for emergency use is in > scope, but PCN-specific mechs for emergency use are out of scope. Sorry for using the word "extend", but I'm not sure whether I understand your answer correctly. We had the discussion about coexistence of several PCN- and non-PCN classes already several times on the list and it seemed to me that is an unsolved issue so far. When I say "extend PCN" I mean adapting the currently discussed single-PCN-class mechanisms to work in a multi-class environment with a pre-defined number of PCN classes. I do not talk about extending PCN for the need of specific applications. The existence of multiple PCN classes has some impact on encoding and possibly also on metering and marking, so this is a question that should be discussed before encoding is decided. As far as I can remember the general view was that the charter does not forbid several PCN classes, but it's not the first thing to be done. Are we in line or is your view that there is and will be only a single PCN class that is coupled with a single PHB? Maybe this is an issue for discussion at the meeting, at least to me, the answer of that question is not clear. Regards, Michael > > > Bob > > >> Regards, >> >> Michael >> >>> >>> Regards, >>> >>> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >>> Steven Blake >>> Ericsson/Redback Networks +1 919-472-9913 >>> >>> >>> >>> _______________________________________________ >>> PCN mailing list >>> PCN@ietf.org >>> https://www1.ietf.org/mailman/listinfo/pcn >>> >> >> -- >> Dr. Michael Menth, Assistant Professor >> University of Wuerzburg, Institute of Computer Science >> Am Hubland, D-97074 Wuerzburg, Germany, room B206 >> phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 >> mailto:menth@informatik.uni-wuerzburg.de >> http://www3.informatik.uni-wuerzburg.de/research/ngn > > ____________________________________________________________________________ > > Bob Briscoe, Networks Research Centre, BT > Research > B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 > 645196 -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 11:01:31 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDiMl-0007uz-B8; Wed, 25 Jul 2007 11:01:31 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDiMj-0007sN-6s for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 11:01:29 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDiMi-0007rY-NN for pcn@ietf.org; Wed, 25 Jul 2007 11:01:28 -0400 Received: from lhrga01-in.huawei.com ([195.33.106.110]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDiMi-0005O4-6Y for pcn@ietf.org; Wed, 25 Jul 2007 11:01:28 -0400 Received: from huawei.com (lhrml01-in [172.18.7.5]) by lhrga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JLQ00AXIPQZLD@lhrga01-in.huawei.com> for pcn@ietf.org; Wed, 25 Jul 2007 16:01:47 +0100 (BST) Received: from jys3105121962 (dhcp-14f9.ietf69.org [130.129.20.249]) by lhrga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JLQ006RRPQV0B@lhrga01-in.huawei.com> for pcn@ietf.org; Wed, 25 Jul 2007 16:01:47 +0100 (BST) Date: Wed, 25 Jul 2007 10:01:17 -0500 From: Tina TSOU To: pcn@ietf.org Message-id: <017a01c7cecc$a8c43670$4fa81cac@jys3105121962> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-Priority: 3 X-MSMail-priority: Normal X-Spam-Score: 0.0 (/) X-Scan-Signature: 0fa76816851382eb71b0a882ccdc29ac Subject: [PCN] addressing X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1071049783==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============1071049783== Content-type: multipart/alternative; boundary="Boundary_(ID_dRfEcLD2eS9PujZJhuUGQQ)" This is a multi-part message in MIME format. --Boundary_(ID_dRfEcLD2eS9PujZJhuUGQQ) Content-type: text/plain; charset=gb2312 Content-transfer-encoding: quoted-printable Hi all, What I was going to comment on "eardley-pcn-architecture-00" = presentation just after the line cut is below. How about refine slide page 7 "PCN-egress-node needs to know address of PCN-ingress-node (or = =A1=AEcentralised node=A1=AF) that will decide whether to admit the new = flow" into "PCN-boundary-node needs to know address of admission-decision-node that = will decide whether to admit the new flow" Then it can cover the following scenario the original texts did not = cover. 1) admission control is made on the egress node (the original text only = includes the ingress node makes the decision) 2) ingress node can also notify the centralised node (the original text = only includes the egress node notifies the centralised node) =20 B. R. Tina Messengers:=20 MSN: tinatsou6@hotmail.com Yahoo: tina_tsou Skype: tinaTSOU = Jabber: tina@jabber.org Google talk: tinatsou6@gmail.com= --Boundary_(ID_dRfEcLD2eS9PujZJhuUGQQ) Content-type: text/html; charset=gb2312 Content-transfer-encoding: quoted-printable
Hi all,
What I was going to comment = on=20 "eardley-pcn-architecture-00" presentation just after the line cut is=20 below.
How about refine slide page 7
"PCN-egress-node needs to = know=20 address of PCN-ingress-node (or =A1=AEcentralised node=A1=AF) that will = decide whether to=20 admit the new flow"
into
"PCN-boundary-node needs to know address = of=20 admission-decision-node that will decide whether to admit the new=20 flow"
Then it can cover the following = scenario the=20 original texts did not cover.
1) admission control is made on the = egress node=20 (the original text only includes the ingress node makes the=20 decision)
2) ingress node can also notify the = centralised=20 node (the original text only includes the egress node notifies the = centralised=20 node)
 
B. R.
Tina
Messengers: =
MSN: tinatsou6@hotmail.com &nbs= p; Yahoo:=20 tina_tsou    Skype: tinaTSOU    Jabber: tina@jabber.org    = Google talk:=20 tinatsou6@gmail.com
<= /BODY> --Boundary_(ID_dRfEcLD2eS9PujZJhuUGQQ)-- --===============1071049783== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============1071049783==-- From pcn-bounces@ietf.org Wed Jul 25 11:29:23 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDinj-00067z-OW; Wed, 25 Jul 2007 11:29:23 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDini-00067q-Pp for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 11:29:22 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDini-00067f-Dx for pcn@ietf.org; Wed, 25 Jul 2007 11:29:22 -0400 Received: from lhrga01-in.huawei.com ([195.33.106.110]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDinh-0006Mk-Ec for pcn@ietf.org; Wed, 25 Jul 2007 11:29:22 -0400 Received: from huawei.com (lhrml01-in [172.18.7.5]) by lhrga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0JLQ00AL9R1LLD@lhrga01-in.huawei.com> for pcn@ietf.org; Wed, 25 Jul 2007 16:29:46 +0100 (BST) Received: from jys3105121962 (dhcp-14f9.ietf69.org [130.129.20.249]) by lhrga01-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTPA id <0JLQ00CVJR1II2@lhrga01-in.huawei.com> for pcn@ietf.org; Wed, 25 Jul 2007 16:29:45 +0100 (BST) Date: Wed, 25 Jul 2007 10:29:16 -0500 From: Tina TSOU To: pcn@ietf.org Message-id: <01b901c7ced0$91743520$4fa81cac@jys3105121962> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Mailer: Microsoft Outlook Express 6.00.2900.3138 Content-type: multipart/mixed; boundary="Boundary_(ID_FXw/EI3nAciQpDtVgZkWHw)" X-Priority: 3 X-MSMail-priority: Normal X-Spam-Score: 0.0 (/) X-Scan-Signature: 2e8fc473f5174be667965460bd5288ba Subject: [PCN] O+M section X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --Boundary_(ID_FXw/EI3nAciQpDtVgZkWHw) Content-type: multipart/alternative; boundary="Boundary_(ID_YQRcGC/c4awilF3WUweb3A)" --Boundary_(ID_YQRcGC/c4awilF3WUweb3A) Content-type: text/plain; charset=gb2312 Content-transfer-encoding: 7BIT Hi all, As promised, attached please find the O+M section which was discussed in the arch designing team. Hope it can be a basis or starting point as the O+M part in the ML. B. R. Tina Messengers: MSN: tinatsou6@hotmail.com Yahoo: tina_tsou Skype: tinaTSOU Jabber: tina@jabber.org Google talk: tinatsou6@gmail.com --Boundary_(ID_YQRcGC/c4awilF3WUweb3A) Content-type: text/html; charset=gb2312 Content-transfer-encoding: 7BIT
Hi all,
As promised, attached please find the O+M section which was discussed in the arch designing team.
Hope it can be a basis or starting point as the O+M part in the ML.
 
B. R.
Tina
Messengers:
MSN: tinatsou6@hotmail.com   Yahoo: tina_tsou    Skype: tinaTSOU    Jabber: tina@jabber.org    Google talk: tinatsou6@gmail.com
--Boundary_(ID_YQRcGC/c4awilF3WUweb3A)-- --Boundary_(ID_FXw/EI3nAciQpDtVgZkWHw) Content-type: text/plain; name="O+M section.txt" Content-transfer-encoding: 7BIT Content-disposition: attachment; filename="O+M section.txt"
This section considers the management aspects of PCN operation.
As in any network, it is important that link and node failures can be detected and rapid restorative action be possible so as to minimize the loss of service caused by such failures. To help assess the impact of failures, PCN-nodes MUST be capable of generating notifications for the following events: when outgoing PCN traffic offered to a link exceeds the configured-termination-rate; when outgoing PCN traffic offered to a link drops back below the configured-termination-rate; when outgoing PCN traffic offered to a link exceeds the configured-admission-rate; when outgoing PCN traffic offered to a link drops back below the configured-admission-rate. It MUST be possible to configure filters on each PCN-node governing the rate at which each class of notification is generated, and to reconfigure those filters in real time as circumstances require. It SHOULD be possible to adjust these filters on a per-link basis.
PCN requires that the following items be configured for every link at every PCN-node: configured-admission-rate in the outgoing direction; configured-termination-rate in the outgoing direction; the notification filters described in the previous sub-section. PCN-ingress-nodes MUST be able to relate incoming offered flows to the egress nodes through which those flows will pass. This may be a matter of configuration or of a per-flow discovery protocol. OPEN ISSUE. PCN-egress-nodes MUST be able to determine to which PCN-ingress-node their reports must be directed, for each PCN flow. Again this may be a matter of configuration or of a per-flow discovery protocol. OPEN ISSUE. [The existing text for this sub-section in Philip's latest draft can follow this introduction, subject to detailed review.]
Accounting at the flow level will undoubtedly have to record instances of flow admission, rejection, and termination, but accounting itself is outside the scope of PCN. The ability to enable or disable flow accounting for specific classes of flow and to specify retrieval of accounting records in real time for specified classes of flow is a general requirement not specific to PCN that may, however, find specific use when diagnosing faults affecting PCN operation.
The following measurements MUST be available from each PCN-node, for each link: date and time at which the measurements were last reset; date and time at which this set of measurements was transmitted or presented to the receiving entity; total number of outgoing PCN packets offered to the link; number of offered outgoing PCN packets that were discarded prior to transmission: number of transmitted outgoing PCN packets that this node marked at the admission level; number of transmitted outgoing PCN packets that this node marked at the termination level; total number of outgoing non-PCN packets offered to the link; total number of outgoing non-PCN packets transmitted on the link. In addition, each PCN-node SHOULD be able to provide the following cumulative durations for each link, for the same time period as the above measurements: cumulative duration of link being in failed state; cumulative duration of link being in state where offered PCN traffic rate exceeded the configured-termination-rate; cumulative duration of link being in state where offered PCN traffic exceeded the configured-admission-rate but di not exceed the configured-termination-rate. Each PCN-ingress-node MUST provide the following measurements for each egress node to which a flow has been offered during the measurement period: date and time at which the measurements were last reset; date and time at which this set of measurements was transmitted or presented to the receiving entity; total number of PCN flows offered; total number of PCN flows admitted; total number of PCN flows terminated after admission because of termination marking reported from the egress node; total number of PCN packets sent, including probe packets; total number of reports received from the egress node. Details of what constitutes a report will be defined in the same document that defines the PCN-related reporting protocol between egress and ingress nodes. Each PCN-egress-node MUST provide the following measurements for each ingress node from which it has received flows during the measurement period: date and time at which the measurements were last reset; date and time at which this set of measurements was transmitted or presented to the receiving entity; total number of PCN packets received; number of received PCN packets marked at the admission level; number of received PCN packets marked at the termination level; number of reports sent to the ingress node. As noted above, what constitutes a report will be defined in the same document that defines the PCN-related reporting protocol between egress and ingress nodes.
The operation of PCN will require the administration of security controls allowing the configuration described in and the collection of the measurements described in to take place. In addition, key management or equivalent security administration will be required to support the mutual authentication of PCN-boundary nodes as described in .
--Boundary_(ID_FXw/EI3nAciQpDtVgZkWHw) Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --Boundary_(ID_FXw/EI3nAciQpDtVgZkWHw)-- From pcn-bounces@ietf.org Wed Jul 25 12:22:57 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDjdZ-0003UA-L2; Wed, 25 Jul 2007 12:22:57 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDjdV-0003Sb-Ru for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 12:22:54 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDjdV-0003Rv-6O for pcn@ietf.org; Wed, 25 Jul 2007 12:22:53 -0400 Received: from smtp4.smtp.bt.com ([217.32.164.151]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDjdS-00044J-C8 for pcn@ietf.org; Wed, 25 Jul 2007 12:22:53 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp4.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 17:22:50 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 17:22:49 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185380568679; Wed, 25 Jul 2007 17:22:48 +0100 Received: from mut.jungle.bt.co.uk ([10.86.7.146]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6PGMigH003317; Wed, 25 Jul 2007 17:22:47 +0100 Message-Id: <5.2.1.1.2.20070725170014.042e6d18@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Wed, 25 Jul 2007 17:22:51 +0100 To: re-ECN unIETF list From: Bob Briscoe Mime-Version: 1.0 X-Spam-Score: -0.334 () ALL_TRUSTED,HTML_40_50,HTML_MESSAGE,MIME_HTML_ONLY X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 25 Jul 2007 16:22:49.0537 (UTC) FILETIME=[0AF40310:01C7CED8] X-Spam-Score: 1.7 (+) X-Scan-Signature: a8a20a483a84f747e56475e290ee868e Cc: PCN IETF list , Aaron Falk , tsvwg IETF list Subject: [PCN] Fwd: [re-ECN] Re-ECN meeting in Chicago X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1640487309==" Errors-To: pcn-bounces@ietf.org --===============1640487309== Content-Type: text/html; charset="us-ascii" Folks,

Just a reminder and link to slides for remote participants:

Ad hoc unofficial BoF on re-ECN at the Chicago IETF and on audio. 1-3pm today 25 Jul 07 (Chicago time), Room: Red Lacquar.

Agenda as posted originally below, but in overview:
1-2pm moving on the work of the group.
2-3pm repeat 'Architectural Intent of re-ECN' from IETF-68, incl long Q&A

Slides:
<http://www.cs.ucl.ac.uk/staff/B.Briscoe/projects/refb/#Presentations>
(notes/audio will also be posted there when produced).

Acknowledgement: Thanks to the IETF for the use of a room and mailing list hosting. And thanks to Aaron Falk for agreeing to chair again.


Bob

Date: Tue, 17 Jul 2007 13:38:13 +0100
From: <toby.moncaster@bt.com>
To: <re-ecn@ietf.org>
Cc: tsv-area@ietf.org, tsvwg@ietf.org
Subject: [re-ECN] Re-ECN meeting in Chicago


All,

There will be another re-ECN unofficial "Bar BoF" happening at IETF69 in Chicago next Wednesday July 25th. It will be at 1300-1500 in the Red Lacquar room. This is a follow on to the meeting held in Prague in March (slides and notes for which can be found at <http://www.cs.ucl.ac.uk/staff/B.Briscoe/projects/refb/#Presentations>)

The aim of the meeting will be to discuss the next steps that need to be taken to move re-ECN forward. The draft agenda is as follows. If anyone would like to add any items please contact me on or off list.

---1pm---

5 mins          Administrivia
25 mins         presentation and discussion on encoding in IP v4 and v6 (rationale behind choices, alternatives, etc) [Bob B + mostly open mic]
10 mins         How to deploy experimentally (open mic)
10 mins         Deployment Scenarios [Bob Briscoe]
10 mins         Next Steps:
                   - format of the encoding (in v4, in v6)
                   - mechanics of the protocol in TCP/IP
                   - implementation of the dropper and the policer
                   - extension for use by TCP proxies or other congestion control proxies  
                   - extension for use by other transports
                   - etc

---2pm---

25 mins Architectural Intent of re-ECN
35 mins Q&A

---3pm--- End

For those that missed it, we could use the second hour of the session to do a repeat of the presentation given in Prague in March. This was intended to present the architectural intent behind re-ECN as well as explaining how the base protocol works.

All Internet drafts and other documentation relevant to re-ECN can be found at: <http://www.cs.ucl.ac.uk/staff/B.Briscoe/projects/refb/> including draft-briscoe-tsvwg-re-ecn-tcp which describes the protocol and the rationale behind it.

Please could you address any replies to this message to the unofficial IETF mailing list re-ecn@ietf.org.

Toby Moncaster
____________________________________________________________________________
Toby Moncaster, <toby.moncaster@bt.com> Networks Research Centre, BT Research
B54/70 Adastral Park, Martlesham Heath, Ipswich, IP53RE, UK.  +44 1473 648734
_______________________________________________
re-ECN mailing list
re-ECN@ietf.org
https://www1.ietf.org/mailman/listinfo/re-ecn

____________________________________________________________________________
Notice: This contribution is the personal view of the author and does not necessarily reflect the technical nor commercial direction of BT plc.
____________________________________________________________________________
Bob Briscoe,                           Networks Research Centre, BT Research
B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK.    +44 1473 645196 --===============1640487309== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============1640487309==-- From pcn-bounces@ietf.org Wed Jul 25 12:37:40 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDjrn-0000lA-VE; Wed, 25 Jul 2007 12:37:39 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDjrm-0000k2-It for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 12:37:38 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDjrm-0000jn-8P for pcn@ietf.org; Wed, 25 Jul 2007 12:37:38 -0400 Received: from smtp3.smtp.bt.com ([217.32.164.138]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDjrk-0004XI-6F for pcn@ietf.org; Wed, 25 Jul 2007 12:37:38 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp3.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 17:37:32 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 17:37:32 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185381450707; Wed, 25 Jul 2007 17:37:30 +0100 Received: from mut.jungle.bt.co.uk ([10.86.7.146]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6PGbOsT003449; Wed, 25 Jul 2007 17:37:28 +0100 Message-Id: <5.2.1.1.2.20070725173315.04cd6450@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Wed, 25 Jul 2007 17:37:38 +0100 To: menth@informatik.uni-wuerzburg.de From: Bob Briscoe Subject: Re: Multiple PCN classes (was: Re: [PCN] Re: How to discuss WG scoping decisions in an RFC?) In-Reply-To: <46A747F8.30704@informatik.uni-wuerzburg.de> References: <5.2.1.1.2.20070725125353.04b36f20@pop3.jungle.bt.co.uk> <1185312460.3454.53.camel@neutrino> <5.2.1.1.2.20070724214148.042b6568@pop3.jungle.bt.co.uk> <1185312460.3454.53.camel@neutrino> <5.2.1.1.2.20070725125353.04b36f20@pop3.jungle.bt.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 25 Jul 2007 16:37:32.0013 (UTC) FILETIME=[18F329D0:01C7CEDA] X-Spam-Score: -1.0 (-) X-Scan-Signature: 1676547e4f33b5e63227e9c02bd359e3 Cc: PCN IETF list X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Michael, Whatever I said, I meant to include what you're saying. Thanks for clarifying. Yes, what you say has major implications on the PCN encoding. If we used 4 DSCPs to encode PCN states, but there were already 2 DSCPs for MLPP, we would need 4x2 DSCPs. Whereas if we used the ECN field for PCN states, it is orthogonal to the DS field. Bob At 13:54 25/07/2007, Michael Menth wrote: >Hi Bob, > > >Bob Briscoe wrote: >>>>Regarding emergency use: the charter says: >>>> >>>> (D) flows may have different precedence, but the applicability >>>> of the PCN mechanisms for emergency use (911, GETS, WPS, >>>> MLPP, etc.) is out of scope >>>> >>>>This could be interpreted in more than one way, but I interpret this as >>>>saying that PCN-specific mechanisms will not take flow precedence into >>>>account. Which is a different than saying that PCN cannot be used with >>>>flow setup protocols/mechanisms that take flow precedence into account. >>> >>>As soon as we have multiple PCN classes it might be useful to think >>>about flow precedence especially with regard to admission and >>>termination priority. Equal treatment of flows means that a highly >>>critical telemedicine application has the same probability to be >>>terminated as a "relatively" uncritcical VoIP call in case of a >>>disaster. I read the passage in the way that it's not our job to define >>>mechanisms for emergency use, but it is not prohibited to extend PCN >>>towards multiple classes with different requirements although this is >>>not the first thing to do. >> >>Michael, just to warn against your use of the word 'extend' PCN. >> >>For the avoidance of doubt, I think Steve's saying it is NOT in scope to >>extend PCN towards multiple classes with different requirements, but it >>is in scope for PCN to use (ie refer out to) other mechanisms that >>satisfy different emergency reqs, and similarly I guess it would be in >>scope to prove PCN doesn't stop these other mechanisms working. >> >>If I'm right, the txt in this arch draft is misleading and should be >>changed. The _applicability_ of PCN mechs for emergency use is in scope, >>but PCN-specific mechs for emergency use are out of scope. > >Sorry for using the word "extend", but I'm not sure whether I understand >your answer correctly. We had the discussion about coexistence of several >PCN- and non-PCN classes already several times on the list and it seemed >to me that is an unsolved issue so far. When I say "extend PCN" I mean >adapting the currently discussed single-PCN-class mechanisms to work in a >multi-class environment with a pre-defined number of PCN classes. I do not >talk about extending PCN for the need of specific applications. > >The existence of multiple PCN classes has some impact on encoding and >possibly also on metering and marking, so this is a question that should >be discussed before encoding is decided. As far as I can remember the >general view was that the charter does not forbid several PCN classes, but >it's not the first thing to be done. Are we in line or is your view that >there is and will be only a single PCN class that is coupled with a single >PHB? Maybe this is an issue for discussion at the meeting, at least to me, >the answer of that question is not clear. > >Regards, > >Michael > > >> >> >>Bob >> >> >>>Regards, >>> >>> Michael >>> >>>> >>>>Regards, >>>> >>>>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >>>>Steven Blake >>>>Ericsson/Redback Networks +1 919-472-9913 >>>> >>>> >>>> >>>>_______________________________________________ >>>>PCN mailing list >>>>PCN@ietf.org >>>>https://www1.ietf.org/mailman/listinfo/pcn >>> >>>-- >>>Dr. Michael Menth, Assistant Professor >>>University of Wuerzburg, Institute of Computer Science >>>Am Hubland, D-97074 Wuerzburg, Germany, room B206 >>>phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 >>>mailto:menth@informatik.uni-wuerzburg.de >>>http://www3.informatik.uni-wuerzburg.de/research/ngn >> >>____________________________________________________________________________ >>Bob Briscoe, Networks Research Centre, BT Research >>B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 > >-- >Dr. Michael Menth, Assistant Professor >University of Wuerzburg, Institute of Computer Science >Am Hubland, D-97074 Wuerzburg, Germany, room B206 >phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 >mailto:menth@informatik.uni-wuerzburg.de >http://www3.informatik.uni-wuerzburg.de/research/ngn ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 14:01:49 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDlBF-0000sW-Ga; Wed, 25 Jul 2007 14:01:49 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDjln-0006T2-W1 for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 12:31:27 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDjln-0006Si-CC; Wed, 25 Jul 2007 12:31:27 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDjll-0004HX-Jl; Wed, 25 Jul 2007 12:31:27 -0400 Received: from E03MVZ4-UKDY.domain1.systemhost.net ([193.113.30.64]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 17:31:25 +0100 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Date: Wed, 25 Jul 2007 17:31:34 +0100 Message-ID: In-Reply-To: <5.2.1.1.2.20070725170014.042e6d18@pop3.jungle.bt.co.uk> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [re-ECN] Re-ECN meeting in Chicago Thread-Index: AcfO2A70gdvfwYf/QgeSzCWH74nztgAALx5g From: To: , X-OriginalArrivalTime: 25 Jul 2007 16:31:25.0040 (UTC) FILETIME=[3E378700:01C7CED9] X-Spam-Score: 0.0 (/) X-Scan-Signature: 1c0c3d540ad9f95212b1c2a9a2cc2595 X-Mailman-Approved-At: Wed, 25 Jul 2007 14:01:48 -0400 Cc: pcn@ietf.org, falk@ISI.EDU, tsvwg@ietf.org Subject: [PCN] RE: [re-ECN] Re-ECN meeting in Chicago X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1057811532==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============1057811532== Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7CED9.3DDF186C" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7CED9.3DDF186C Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable For remote participants the audio stream is on channel 4: http://videolab.uoregon.edu/events/ietf/ietf694.m3u =20 We have been unable to set up a jabber stream... =20 Toby ________________________________ From: Bob Briscoe [mailto:rbriscoe@jungle.bt.co.uk]=20 Sent: 25 July 2007 11:23 To: re-ECN unIETF list Cc: PCN IETF list; Aaron Falk; tsvwg IETF list Subject: Fwd: [re-ECN] Re-ECN meeting in Chicago Folks, Just a reminder and link to slides for remote participants: Ad hoc unofficial BoF on re-ECN at the Chicago IETF and on audio. 1-3pm today 25 Jul 07 (Chicago time), Room: Red Lacquar. Agenda as posted originally below, but in overview:=20 1-2pm moving on the work of the group.=20 2-3pm repeat 'Architectural Intent of re-ECN' from IETF-68, incl long Q&A Slides: (notes/audio will also be posted there when produced). Acknowledgement: Thanks to the IETF for the use of a room and mailing list hosting. And thanks to Aaron Falk for agreeing to chair again. Bob Date: Tue, 17 Jul 2007 13:38:13 +0100 From: To: Cc: tsv-area@ietf.org, tsvwg@ietf.org Subject: [re-ECN] Re-ECN meeting in Chicago =09 =09 All,=20 =09 There will be another re-ECN unofficial "Bar BoF" happening at IETF69 in Chicago next Wednesday July 25th. It will be at 1300-1500 in the Red Lacquar room. This is a follow on to the meeting held in Prague in March (slides and notes for which can be found at >) =09 The aim of the meeting will be to discuss the next steps that need to be taken to move re-ECN forward. The draft agenda is as follows. If anyone would like to add any items please contact me on or off list.=20 =09 ---1pm--- 5 mins Administrivia=20 25 mins presentation and discussion on encoding in IP v4 and v6 (rationale behind choices, alternatives, etc) [Bob B + mostly open mic] 10 mins How to deploy experimentally (open mic)=20 10 mins Deployment Scenarios [Bob Briscoe] 10 mins Next Steps:=20 - format of the encoding (in v4, in v6)=20 - mechanics of the protocol in TCP/IP=20 - implementation of the dropper and the policer=20 - extension for use by TCP proxies or other congestion control proxies =20 - extension for use by other transports=20 - etc=20 =09 ---2pm--- 25 mins Architectural Intent of re-ECN 35 mins Q&A ---3pm--- End For those that missed it, we could use the second hour of the session to do a repeat of the presentation given in Prague in March. This was intended to present the architectural intent behind re-ECN as well as explaining how the base protocol works. =09 All Internet drafts and other documentation relevant to re-ECN can be found at: > including draft-briscoe-tsvwg-re-ecn-tcp which describes the protocol and the rationale behind it. =09 Please could you address any replies to this message to the unofficial IETF mailing list re-ecn@ietf.org.=20 =09 Toby Moncaster=20 =09 ________________________________________________________________________ ____=20 Toby Moncaster, Networks Research Centre, BT Research=20 B54/70 Adastral Park, Martlesham Heath, Ipswich, IP53RE, UK. +44 1473 648734=20 _______________________________________________ re-ECN mailing list re-ECN@ietf.org https://www1.ietf.org/mailman/listinfo/re-ecn ________________________________________________________________________ ____ Notice: This contribution is the personal view of the author and does not necessarily reflect the technical nor commercial direction of BT plc. ________________________________________________________________________ ____ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196=20 ------_=_NextPart_001_01C7CED9.3DDF186C Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

For remote participants the audio = stream is on channel=20 4: http://video= lab.uoregon.edu/events/ietf/ietf694.m3u
 
We have been unable to set up a jabber=20 stream...
 
Toby

From: Bob Briscoe=20 [mailto:rbriscoe@jungle.bt.co.uk]
Sent: 25 July 2007=20 11:23
To: re-ECN unIETF list
Cc: PCN IETF list; = Aaron Falk;=20 tsvwg IETF list
Subject: Fwd: [re-ECN] Re-ECN meeting in=20 Chicago

Folks,

Just a reminder and link to slides for remote=20 participants:

Ad hoc unofficial BoF on re-ECN at the Chicago IETF = and on=20 audio. 1-3pm today 25 Jul 07 (Chicago time), Room: Red = Lacquar.

Agenda as=20 posted originally below, but in overview:
1-2pm moving on the work = of the=20 group.
2-3pm repeat 'Architectural Intent of re-ECN' from IETF-68, = incl long=20 Q&A

Slides:
<http://www.cs.ucl.ac.uk/staff/B.Briscoe/projects/refb/= #Presentations>
(notes/audio=20 will also be posted there when produced).

Acknowledgement: Thanks = to the=20 IETF for the use of a room and mailing list hosting. And thanks to Aaron = Falk=20 for agreeing to chair again.


Bob

Date: Tue, 17 Jul 2007 = 13:38:13=20 +0100
From: <toby.moncaster@bt.com>
To:=20 <re-ecn@ietf.org>
Cc: tsv-area@ietf.org, = tsvwg@ietf.org
Subject:=20 [re-ECN] Re-ECN meeting in Chicago


All,

There will be=20 another re-ECN unofficial "Bar BoF" happening at IETF69 in Chicago = next=20 Wednesday July 25th. It will be at 1300-1500 in the Red Lacquar room. = This is=20 a follow on to the meeting held in Prague in March (slides and notes = for which=20 can be found at <http://www.cs.ucl.ac.uk/staff/B.Briscoe/projects/refb/#Presen= tations>)

The aim of the meeting will be to = discuss the=20 next steps that need to be taken to move re-ECN forward. The draft = agenda is=20 as follows. If anyone would like to add any items please contact me on = or off=20 list.

---1pm---

5=20 mins          = Administrivia=20
25 mins         = presentation and=20 discussion on encoding in IP v4 and v6 (rationale behind choices,=20 alternatives, etc) [Bob B + mostly open mic]
10=20 mins         How to deploy=20 experimentally (open mic)
10=20 mins         Deployment = Scenarios [Bob=20 Briscoe]
10 mins         = Next=20 Steps:=20 =
           &nb= sp;      =20 - format of the encoding (in v4, in v6)=20 =
           &nb= sp;      =20 - mechanics of the protocol in TCP/IP=20 =
           &nb= sp;      =20 - implementation of the dropper and the policer=20 =
           &nb= sp;      =20 - extension for use by TCP proxies or other congestion control=20 proxies  =20 =
           &nb= sp;      =20 - extension for use by other transports=20 =
           &nb= sp;      =20 - etc

---2pm---

25 mins Architectural = Intent of=20 re-ECN
35 mins Q&A

---3pm--- End

For those that missed it, we could use the second hour of the = session=20 to do a repeat of the presentation given in Prague in March. This was = intended=20 to present the architectural intent behind re-ECN as well as = explaining how=20 the base protocol works.

All Internet drafts and other documentation relevant to = re-ECN can be=20 found at: <http://www.cs.ucl.ac.uk/staff/B.Briscoe/projects/refb/> including = draft-briscoe-tsvwg-re-ecn-tcp=20 which describes the protocol and the rationale behind = it.

Please could you address any = replies to this=20 message to the unofficial IETF mailing list re-ecn@ietf.org.=20

Toby = Moncaster
________________________________________________________________= ____________=20
Toby Moncaster, <toby.moncaster@bt.com> = Networks=20 Research Centre, BT Research
B54/70 Adastral = Park,=20 Martlesham Heath, Ipswich, IP53RE, UK.  +44 1473 648734=20
_______________________________________________
re-ECN mailing=20 list
re-ECN@ietf.org
https://www1.ietf.org/mailman/listinfo/re-ecn

___________________________________________________________= _________________
Notice:=20 This contribution is the personal view of the author and does not = necessarily=20 reflect the technical nor commercial direction of BT=20 plc.
_________________________________________________________________= ___________
Bob=20 Briscoe,           = ;            =    =20 Networks Research Centre, BT Research
B54/77 Adastral Park,Martlesham = Heath,Ipswich,IP5 3RE,UK.    +44 1473 645196 =

------_=_NextPart_001_01C7CED9.3DDF186C-- --===============1057811532== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============1057811532==-- From pcn-bounces@ietf.org Wed Jul 25 14:14:23 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDlNP-0004GI-20; Wed, 25 Jul 2007 14:14:23 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDlNO-0004G0-5y for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 14:14:22 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDlNN-0004Fg-PE for pcn@ietf.org; Wed, 25 Jul 2007 14:14:21 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDlKu-0003A1-4D for pcn@ietf.org; Wed, 25 Jul 2007 14:11:48 -0400 Received: from an-out-0708.google.com ([209.85.132.241]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDlKs-0008Qq-He for pcn@ietf.org; Wed, 25 Jul 2007 14:11:47 -0400 Received: by an-out-0708.google.com with SMTP id c17so58604anc for ; Wed, 25 Jul 2007 11:11:46 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=KjgCFSWqkx6/QayMfU3aAmgQrGD4vO/v2088mxPyu1/VpgzFSaKUV+ViOiX/vu8CpnWJjasrYT+G86G7HdpDAbzfNZDYw56wSNXAMsWTuGmE7KBerYiyx5+zCSMIkSUsdDXQIYXO6mhwuGuk31Xux+9xwlA4vabdhvKh0eMUTIs= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:reply-to:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=GM/rXI+c4LTVOvUHbU3SME0P+ea7eoJqf5AI4lr8kJ9kYpwEj+3hwkWlrFId1CCWyvF/EImRniCzTBEslap036CffrxFNW1mVmPY2qW32LP5PywjauCa4f0bk3U8j899itu6LqLnrjB/kRNUAZKTMw1Ej4Q9CfBaDstSklRf3LQ= Received: by 10.100.106.5 with SMTP id e5mr522134anc.1185387106109; Wed, 25 Jul 2007 11:11:46 -0700 (PDT) Received: by 10.100.144.10 with HTTP; Wed, 25 Jul 2007 11:11:46 -0700 (PDT) Message-ID: Date: Wed, 25 Jul 2007 11:11:46 -0700 From: "Lachlan Andrew" To: "PCN IETF list" MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Spam-Score: 0.0 (/) X-Scan-Signature: ea4ac80f790299f943f0a53be7e1a21a X-TMDA-Confirmed: Wed, 25 Jul 2007 14:14:21 -0400 Cc: Stephen Hanly , Sammy Chan Subject: [PCN] Marking scheme better than random marking X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: l.andrew@ieee.org List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Greetings all, I'm a newcomer to this WG, but noticed a heavy reliance on marking of packets to signal continuous values. It was good to discuss an alternative with some of you over lunch. The proposal (ADPM) is described at and in more detail at . It is a way of sending a continuous-valued signal over an ECN-type channel (a binary channel subject to to loss, reordering, duplication etc). The terminology is that of congestion control, but seems to be applicable to PCN. It overcomes the unfairness to long-haul flows traversing multiple bottlenecks, giving max-min fairness (is that "too fair"?). I think this can be used by several of the schemes (notably LC-PCN) with no major change to the scheme. Questions or comments are welcome. Cheers, Lachlan -- Lachlan Andrew Dept of Computer Science, Caltech 1200 E California Blvd, Mail Code 256-80, Pasadena CA 91125, USA Phone: +1 (626) 395-8820 Fax: +1 (626) 568-3603 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 14:47:07 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDlt5-0003FS-Gf; Wed, 25 Jul 2007 14:47:07 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDlt4-0003FG-M4 for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 14:47:06 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDlt4-0003F2-Ac for pcn@ietf.org; Wed, 25 Jul 2007 14:47:06 -0400 Received: from rtp-iport-2.cisco.com ([64.102.122.149]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDlt3-0006Ii-Sj for pcn@ietf.org; Wed, 25 Jul 2007 14:47:06 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-2.cisco.com with ESMTP; 25 Jul 2007 14:47:06 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAIs3p0ZAZnme/2dsb2JhbAA X-IronPort-AV: i="4.16,581,1175486400"; d="scan'208"; a="127008589:sNHT28393652" Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6PIl5YU020322; Wed, 25 Jul 2007 14:47:05 -0400 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6PIkxWI026265; Wed, 25 Jul 2007 18:46:59 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 14:46:59 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Marking scheme better than random marking Date: Wed, 25 Jul 2007 14:46:58 -0400 Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Marking scheme better than random marking Thread-Index: AcfO56iIR8kY6mDPTDe2V6dzzOLaqgAA2l5Q From: "Anna Charny \(acharny\)" To: , "PCN IETF list" X-OriginalArrivalTime: 25 Jul 2007 18:46:59.0534 (UTC) FILETIME=[2EC0CEE0:01C7CEEC] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=2186; t=1185389225; x=1186253225; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20RE=3A=20[PCN]=20Marking=20scheme=20better=20than=20random=20m arking |Sender:=20 |To:=20,=20=22PCN=20IETF=20list=22=20; bh=Vzrch2bY0XPY0Y9bbDLStpg5FQ2pv8AY9KjFO77sLiY=; b=NSdk3DC5hIJV4ap0KyG+gDaU/YOy6CA9x9pUALnG+KrJCfUFefPYKjQsc2N3o+DJ56JFs03u R7YUwCxgPgR/zbDMYW2n2H4LzhIpF5RV9aGSipi2OBwu3YEkWEB8VWMR; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: 0.0 (/) X-Scan-Signature: 082a9cbf4d599f360ac7f815372a6a15 Cc: Stephen Hanly , Sammy Chan X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Lachlan, I think I now understand the proposal after a very helful discussion today. But I do not quite understand how it overcomes unfairness for flows traversing multiple bottlenecks in the context of admission control? It seems the type of marking should not change the fact that the long flow finds a link in the state of congestion more often than the short-haul flows, it cannot admit more often than the short-haul flows. So at the same demand level, short-haul flows win. =20 Maybe I am still missing something about the algorithm still... Can you explain? Thanks, Anna=20 > -----Original Message----- > From: Lachlan Andrew [mailto:lachlan.andrew@gmail.com]=20 > Sent: Wednesday, July 25, 2007 2:12 PM > To: PCN IETF list > Cc: Stephen Hanly; Sammy Chan > Subject: [PCN] Marking scheme better than random marking >=20 > Greetings all, >=20 > I'm a newcomer to this WG, but noticed a heavy reliance on=20 > marking of packets to signal continuous values. >=20 > It was good to discuss an alternative with some of you over lunch. > The proposal (ADPM) is described at > and=20 > in more detail at . >=20 > It is a way of sending a continuous-valued signal over an=20 > ECN-type channel (a binary channel subject to to loss,=20 > reordering, duplication etc). The terminology is that of=20 > congestion control, but seems to be applicable to PCN. >=20 > It overcomes the unfairness to long-haul flows traversing=20 > multiple bottlenecks, giving max-min fairness (is that "too fair"?). >=20 > I think this can be used by several of the schemes (notably=20 > LC-PCN) with no major change to the scheme. >=20 > Questions or comments are welcome. >=20 > Cheers, > Lachlan >=20 > -- > Lachlan Andrew Dept of Computer Science, Caltech 1200 E=20 > California Blvd, Mail Code 256-80, Pasadena CA 91125, USA > Phone: +1 (626) 395-8820 Fax: +1 (626) 568-3603 >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn >=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 15:21:03 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDmPv-0007Hm-20; Wed, 25 Jul 2007 15:21:03 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDmPu-0007Hg-72 for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 15:21:02 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDmPt-0007HY-TU for pcn@ietf.org; Wed, 25 Jul 2007 15:21:01 -0400 Received: from an-out-0708.google.com ([209.85.132.247]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDmPt-0002NL-JA for pcn@ietf.org; Wed, 25 Jul 2007 15:21:01 -0400 Received: by an-out-0708.google.com with SMTP id c17so63266anc for ; Wed, 25 Jul 2007 12:21:01 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Taaj0yLdm4MJUKlZUihr9MQzKqc9WszZd+JiWgb7LJZi7KY9tTtTNKspHJNy5uowds9Dcp0+U8i5MShB/t7NcrDwjxqYPPHUmva23FP5eYVGIO/8PjnfXtVpqrz+gMNtWoTitRGa84Vdh74DUvHNVS3bX1gZYK3zd3kq/Tx+0Qc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=pKe7E69Agp9Q1yhqQFYRO/hAvW6MrIofs8SAUca+LKcmwjUmiJSYHlciHZ1sNo+j/xlhILkBLuto1yn9lbFR1YC3oOcKE7jgUllXK2L5kWVQqAQudgbOaiZ2oyl1GFKwPDOr1nUSVK5g0C/CAFYPnzx53IPohUw5fYtLS1GDQe4= Received: by 10.100.142.12 with SMTP id p12mr561054and.1185391260089; Wed, 25 Jul 2007 12:21:00 -0700 (PDT) Received: by 10.100.144.10 with HTTP; Wed, 25 Jul 2007 12:21:00 -0700 (PDT) Message-ID: Date: Wed, 25 Jul 2007 12:21:00 -0700 From: "Lachlan Andrew" To: "Anna Charny (acharny)" Subject: Re: [PCN] Marking scheme better than random marking In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: X-Spam-Score: 0.0 (/) X-Scan-Signature: 7baded97d9887f7a0c7e8a33c2e3ea1b Cc: Stephen Hanly , PCN IETF list , Sammy Chan X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: l.andrew@ieee.org List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Greetings Anna, Good point -- I was mainly extrapolating from what happens in congestion control. It only resolves a particular form of unfairness. I assume that each link has a continuous-valued "congestion level" (in the interval [0,1]) to be signalled. Consider a network with two links with congestion levels A and B. If both links independently mark packets, with probabilities A and B, then a packet traversing both links is more likely to be marked than a packet traversing only the more congested link. In ADPM, the marking probability is max(A,B). If the links "pre-quantise" the congestion level into "congested" or "not congested" then you are quite right that longer flows are more likely to observe one of the links being congested. A leaky-bucket scheme which defines a link as "congested" when the bucket is empty has already quantised the continuous value. Is that the scenario you're thinking of? I'm not sure if ADPM can be adapted to work in the leaky-bucket case. I'll have to read your(?) draft first. Cheers, Lachlan On 25/07/07, Anna Charny (acharny) wrote: > I do not quite understand how it overcomes unfairness for > flows traversing multiple bottlenecks in the context of admission > control? It seems > the type of marking should not change the fact that the long flow finds > a link in the state of congestion more often than the short-haul flows, > it cannot admit more often than the short-haul flows. So at the same > demand level, short-haul flows win. -- Lachlan Andrew Dept of Computer Science, Caltech 1200 E California Blvd, Mail Code 256-80, Pasadena CA 91125, USA Phone: +1 (626) 395-8820 Fax: +1 (626) 568-3603 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 15:45:00 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDmn5-0005ZU-VH; Wed, 25 Jul 2007 15:44:59 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDmn4-0005ZO-Nf for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 15:44:58 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDmn4-0005ZG-Dx for pcn@ietf.org; Wed, 25 Jul 2007 15:44:58 -0400 Received: from rtp-iport-1.cisco.com ([64.102.122.148]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDmn3-0002oF-SJ for pcn@ietf.org; Wed, 25 Jul 2007 15:44:58 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-1.cisco.com with ESMTP; 25 Jul 2007 15:44:56 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAN9Ep0ZAZnme/2dsb2JhbAA X-IronPort-AV: i="4.16,581,1175486400"; d="scan'208"; a="66139461:sNHT812187718" Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6PJiueI022855; Wed, 25 Jul 2007 15:44:56 -0400 Received: from xbh-rtp-201.amer.cisco.com (xbh-rtp-201.cisco.com [64.102.31.12]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6PJiDWc021771; Wed, 25 Jul 2007 19:44:51 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 15:44:23 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Marking scheme better than random marking Date: Wed, 25 Jul 2007 15:44:17 -0400 Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Marking scheme better than random marking Thread-Index: AcfO8PX/5fnNA8QSSwSEj3PGNxTWHAAAi27Q From: "Anna Charny \(acharny\)" To: X-OriginalArrivalTime: 25 Jul 2007 19:44:23.0330 (UTC) FILETIME=[336A6020:01C7CEF4] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=3499; t=1185392696; x=1186256696; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20RE=3A=20[PCN]=20Marking=20scheme=20better=20than=20random=20m arking |Sender:=20 |To:=20; bh=WbMtDjRab4aSzeK/yMJ96g0gwtwan7TUn443sqBJzIM=; b=ALIlDqEsxaWakVTkGsKf2Z+9Uj3F2Ef5DgC4z6AaQe96fqQnaMv3UVuYvX8im01Ids15y1mO 6Sv/pg+1EJ4cvOGYphaY0VrFctDJIQSLqs9jBhr2b9ODjQDGcZsPl9EZ; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: 00e94c813bef7832af255170dca19e36 Cc: Stephen Hanly , PCN IETF list , Sammy Chan X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Lachlan, I think there are two different causes of unfairness that are being lumped together. The first is when a flow passes through multiple links simultaneously congested. In that case, if care is not taken, the flow traversing more congestion points gets more congestion marks and is more affected, under some marking schemes. Indeed, diferent marking techniques have different amount of exposure to this problem. =20 The second one has to do with the amount of time the long-haul aggregate sees congestion on at least one of the links. The worst case here is when at any given time only one of the links is congested, and at least one is congested all (or most of) the time. Then, the short-haul aggregates, which only see congestion ocasionally, will keep admitting new flows, whereas the long-term ones will never (in the worst case) or rarely (in practice) be allowed to admit. This is the phenomenon discussed today at the meeting. And I think your message below indicates that you agree that there is nothing your proposal can do to deal with this one? I do agree that the marking method you propose seems compatible with the draft-westberg approach (would it be correct to say that this would be a clever implementation of excess-rate-proportional marking?) Thanks, Anna=20 > -----Original Message----- > From: Lachlan Andrew [mailto:lachlan.andrew@gmail.com]=20 > Sent: Wednesday, July 25, 2007 3:21 PM > To: Anna Charny (acharny) > Cc: PCN IETF list; Stephen Hanly; Sammy Chan > Subject: Re: [PCN] Marking scheme better than random marking >=20 > Greetings Anna, >=20 > Good point -- I was mainly extrapolating from what happens in=20 > congestion control. It only resolves a particular form of unfairness. >=20 > I assume that each link has a continuous-valued "congestion level" > (in the interval [0,1]) to be signalled. Consider a network with two > links with congestion levels A and B. If both links independently > mark packets, with probabilities A and B, then a packet=20 > traversing both links is more likely to be marked than a=20 > packet traversing only the more congested link. In ADPM, the=20 > marking probability is max(A,B). >=20 > If the links "pre-quantise" the congestion level into=20 > "congested" or "not congested" then you are quite right that=20 > longer flows are more likely to observe one of the links=20 > being congested. A leaky-bucket scheme which defines a link=20 > as "congested" when the bucket is empty has already quantised=20 > the continuous value. Is that the scenario you're thinking of? >=20 > I'm not sure if ADPM can be adapted to work in the leaky-bucket case. > I'll have to read your(?) draft first. >=20 > Cheers, > Lachlan >=20 > On 25/07/07, Anna Charny (acharny) wrote: > > I do not quite understand how it overcomes unfairness for flows=20 > > traversing multiple bottlenecks in the context of admission=20 > control? =20 > > It seems the type of marking should not change the fact=20 > that the long=20 > > flow finds a link in the state of congestion more often than the=20 > > short-haul flows, it cannot admit more often than the short-haul=20 > > flows. So at the same demand level, short-haul flows win. >=20 >=20 > -- > Lachlan Andrew Dept of Computer Science, Caltech 1200 E=20 > California Blvd, Mail Code 256-80, Pasadena CA 91125, USA > Phone: +1 (626) 395-8820 Fax: +1 (626) 568-3603 >=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 16:16:15 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDnHL-0005XE-FE; Wed, 25 Jul 2007 16:16:15 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDnHK-0005X8-3G for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 16:16:14 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDnHJ-0005X0-Pk for pcn@ietf.org; Wed, 25 Jul 2007 16:16:13 -0400 Received: from an-out-0708.google.com ([209.85.132.251]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDnHJ-0003QI-E5 for pcn@ietf.org; Wed, 25 Jul 2007 16:16:13 -0400 Received: by an-out-0708.google.com with SMTP id c17so66847anc for ; Wed, 25 Jul 2007 13:16:13 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=GlWCeE3BG/2fZfcPT+yOzt/se5xlpfUx/0qL0qBDARmuN//IBX1ajkm26P4kLGVRdqpkyaZSg7LyuIcn5/N3R/msIK4cSDenFnrBXlt+/GyLTUdtYh1ixpX8dWYvGmVahwBq8wR9HnK8f8i0RFo1GzbBTFJIzEIkla0r7VXfmnk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=RspHVs+LSf4NARncV3Zb2U1h3PqWqDsYM+GctEaQcahmFoUkmnfEfj6Y/Tnz5ZkUX1jK0cGiBZqxn/t97n+bX3ZCgBrNLv8ByMznVw5O33aRYDxRwpoVme/BOBzD9LVfkPmdpR+iFGqL/Wvz6zXGakEcnio6uSEYnMw8cIYtIYc= Received: by 10.100.177.16 with SMTP id z16mr604972ane.1185394573052; Wed, 25 Jul 2007 13:16:13 -0700 (PDT) Received: by 10.100.144.10 with HTTP; Wed, 25 Jul 2007 13:16:13 -0700 (PDT) Message-ID: Date: Wed, 25 Jul 2007 13:16:13 -0700 From: "Lachlan Andrew" To: "Anna Charny (acharny)" Subject: Re: [PCN] Marking scheme better than random marking In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: X-Spam-Score: 0.0 (/) X-Scan-Signature: 8b431ad66d60be2d47c7bfeb879db82c Cc: Stephen Hanly , PCN IETF list , Sammy Chan X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: l.andrew@ieee.org List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Greetings Anna, I still think that On 25/07/07, Anna Charny (acharny) wrote: > > I think there are two different causes of unfairness that are being > lumped together. Exactly. That's why I said last email that it only resolves a particular form of unfairness. > The second one has to do with the amount of time the long-haul aggregate > sees congestion on at least one of the links. The worst case here is > when at any given time only one of the links is congested, and at least > one is congested all (or most of) the time. Agreed. If "congestion" is a binary state then signalling can't help. My (naive?) argument would be that in practice congestion isn't binary. If a link is operating very close to capacity, we should admit a small fraction of flows, if it is further from capacity we admit more flows. (When I think as a theoretician, I also think we can admit a very few flows when the link is overloaded, assuming that flows will depart continuously.) Achieving fairness may need the one-hop flows to average the congestion level over a time comparable to the duration of a flow before allowing a new flow to start. A scheme which admits either all or no flows probably won't benefit from ADPM, but I would suggest that admitting a fraction of flows based on more information would give better performance. > And I think your message below indicates > that you agree that there is nothing your proposal can do to deal with > this one? I agree that it would require other changes to the admission control in addition to ADPM. I'm not sure if those changes would be easy. > I do agree that the marking method you propose seems compatible with the > draft-westberg approach (would it be correct to say that this would be a > clever implementation of excess-rate-proportional marking?) Yes, it is simply a way to do "X-proportional" marking. Cheers, Lachlan -- Lachlan Andrew Dept of Computer Science, Caltech 1200 E California Blvd, Mail Code 256-80, Pasadena CA 91125, USA Phone: +1 (626) 395-8820 Fax: +1 (626) 568-3603 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 16:20:30 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDnLS-0008JG-5C; Wed, 25 Jul 2007 16:20:30 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDnLQ-0008Ea-BW for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 16:20:28 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDnLP-00088D-PB for pcn@ietf.org; Wed, 25 Jul 2007 16:20:27 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDnLP-000064-EC for pcn@ietf.org; Wed, 25 Jul 2007 16:20:27 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6PKKOC17067; Wed, 25 Jul 2007 20:20:25 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Subject: RE: [PCN] could multicast service be supported in a PCN domain? Date: Wed, 25 Jul 2007 16:20:23 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB646511701910@zcarhxm1.corp.nortel.com> In-Reply-To: <000001c7ce9e$eddd5ad0$4b0c6f0a@china.huawei.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] could multicast service be supported in a PCN domain? Thread-Index: AcfOnu19Zd2bEBfoS22P6lRefMVviwAWdNZA References: <000001c7ce9e$eddd5ad0$4b0c6f0a@china.huawei.com> From: "Jozef Babiarz" To: "Delei Yu" , X-Spam-Score: 0.0 (/) X-Scan-Signature: 0e831a3b581a967a651997b2cbc2bae7 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1128899087==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============1128899087== Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7CEF9.3B5D0C53" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7CEF9.3B5D0C53 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Delei, We have not looked at PCN use with multicast. Currently it is not in scope. =20 Regards, Joe=20 email:babiarz@nortel.com=20 Telephone:613-763-6098=20 ________________________________ From: Delei Yu [mailto:yudelei@huawei.com]=20 Sent: July 25, 2007 5:34 AM To: pcn@ietf.org Subject: [PCN] could multicast service be supported in a PCN domain? =20 PCNers, Is it possible for multicast service to be supported in a PCN domain? PCN charter hasn't covered this. So this is just a question for question. -:) =20 ------_=_NextPart_001_01C7CEF9.3B5D0C53 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Delei,

We have not looked = at PCN use with multicast. Currently it is not in = scope.

 

Regards, = Joe
email:babiarz@nortel.com
Telephone:613-763-6098

From: Delei Yu [mailto:yudelei@huawei.com]
Sent: July 25, 2007 5:34 = AM
To: pcn@ietf.org
Subject: [PCN] could = multicast service be supported in a PCN domain?

 

PCNers,

Is it possible for multicast service = to be supported in a PCN domain? PCN charter hasn’t covered this. So = this is just a question for question. -:)

 

------_=_NextPart_001_01C7CEF9.3B5D0C53-- --===============1128899087== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============1128899087==-- From pcn-bounces@ietf.org Wed Jul 25 17:13:31 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDoAi-0005m1-UR; Wed, 25 Jul 2007 17:13:28 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDoAi-0005lw-3s for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 17:13:28 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDoAh-0005lo-QI for pcn@ietf.org; Wed, 25 Jul 2007 17:13:27 -0400 Received: from peter.ietf69.org ([130.129.5.6] helo=smtp.ietf69.org) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDoAg-0004en-Ch for pcn@ietf.org; Wed, 25 Jul 2007 17:13:27 -0400 Received: from [130.129.22.239] (dhcp-16ef.ietf69.org [130.129.22.239]) by smtp.ietf69.org (Postfix) with ESMTP id 27F28D68001; Wed, 25 Jul 2007 16:13:24 -0500 (CDT) In-Reply-To: <9671A92C3C8B5744BC97F855F7CB646511701910@zcarhxm1.corp.nortel.com> References: <000001c7ce9e$eddd5ad0$4b0c6f0a@china.huawei.com> <9671A92C3C8B5744BC97F855F7CB646511701910@zcarhxm1.corp.nortel.com> Mime-Version: 1.0 (Apple Message framework v752.2) Message-Id: From: ken carlberg Subject: Re: [PCN] could multicast service be supported in a PCN domain? Date: Wed, 25 Jul 2007 16:13:21 -0500 To: "Jozef Babiarz" X-Mailer: Apple Mail (2.752.2) X-Spam-Score: 0.0 (/) X-Scan-Signature: 3971661e40967acfc35f708dd5f33760 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0957001484==" Errors-To: pcn-bounces@ietf.org --===============0957001484== Content-Type: multipart/alternative; boundary=Apple-Mail-4-932371591 --Apple-Mail-4-932371591 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed A question to the chairs. When would be a reasonable time to bring =20 up a new topic like multicast to the group in the form of a draft-=20 rfc? Personally, I wouldn't mind seeing something around the time =20 that Phil Eardley's Architecture draft is at working group last call =20 to at least get a tangible feel of the specifics so as to make a more =20= informed decision then as to its acceptance. I also wouldn't mind to at least hear on this list in the coming week=20 (s), ever so briefly, what Delei would like to explore. I suspect =20 that this list will quiet down shortly and for a period of time as =20 author's go working on comments of the past week and from today's =20 meeting. -ken On Jul 25, 2007, at 3:20 PM, Jozef Babiarz wrote: > Delei, > > We have not looked at PCN use with multicast. Currently it is not =20 > in scope. > > > > Regards, Joe > email:babiarz@nortel.com > Telephone:613-763-6098 > > From: Delei Yu [mailto:yudelei@huawei.com] > Sent: July 25, 2007 5:34 AM > To: pcn@ietf.org > Subject: [PCN] could multicast service be supported in a PCN domain? > > > > PCNers, > > Is it possible for multicast service to be supported in a PCN =20 > domain? PCN charter hasn=92t covered this. So this is just a question =20= > for question. -:) > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn --Apple-Mail-4-932371591 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=WINDOWS-1252 A question to the chairs.=A0 = When would be a reasonable time to bring up a new topic like multicast = to the group in the form of a draft-rfc?=A0 Personally, I wouldn't mind = seeing something around the time that Phil Eardley's Architecture draft = is at working group last call to at least get a tangible feel of the = specifics so as to make a more informed decision then as to its = acceptance.

I also = wouldn't mind to at least hear on this list in the coming week(s), ever = so briefly, what Delei would like to explore.=A0 I suspect that this = list will quiet down shortly and for a period of time as author's go = working on comments of the past week and from today's = meeting.

-ken


On Jul 25, = 2007, at 3:20 PM, Jozef Babiarz wrote:

Delei,

We have not looked = at PCN use with multicast. Currently it is not in = scope.

=A0

Regards, = Joe =
email:babiarz@nortel.com=
= Telephone:613-763-6098

=

From: Delei Yu [mailto:yudelei@huawei.com]
= Sent: July 25, 2007 5:34 = AM
To: pcn@ietf.org
Subject: [PCN] could multicast = service be supported in a PCN domain?

=A0

PCNers,

Is it = possible for multicast service to be supported in a PCN domain? PCN = charter hasn=92t covered this. So this is just a question for question. = -:)

=A0

=
PCN mailing list
=

= --Apple-Mail-4-932371591-- --===============0957001484== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0957001484==-- From pcn-bounces@ietf.org Wed Jul 25 17:19:54 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDoGw-0004U0-1p; Wed, 25 Jul 2007 17:19:54 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDoGv-0004Tv-0b for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 17:19:53 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDoGu-0004Tn-Ln for pcn@ietf.org; Wed, 25 Jul 2007 17:19:52 -0400 Received: from rtp-iport-1.cisco.com ([64.102.122.148]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IDoGu-0001SD-Ac for pcn@ietf.org; Wed, 25 Jul 2007 17:19:52 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-1.cisco.com with ESMTP; 25 Jul 2007 17:19:52 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CACJbp0ZAZnme/2dsb2JhbAA X-IronPort-AV: i="4.16,581,1175486400"; d="scan'208"; a="66150123:sNHT32497296" Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6PLJp1G006614; Wed, 25 Jul 2007 17:19:51 -0400 Received: from xbh-rtp-201.amer.cisco.com (xbh-rtp-201.cisco.com [64.102.31.12]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6PLJoWI029460; Wed, 25 Jul 2007 21:19:50 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 17:19:50 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Marking scheme better than random marking Date: Wed, 25 Jul 2007 17:19:47 -0400 Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Marking scheme better than random marking Thread-Index: AcfO+Kc8dRC409T8SuOghCmRvaX25AAB+u2g From: "Anna Charny \(acharny\)" To: X-OriginalArrivalTime: 25 Jul 2007 21:19:50.0296 (UTC) FILETIME=[88F40980:01C7CF01] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=1352; t=1185398391; x=1186262391; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20RE=3A=20[PCN]=20Marking=20scheme=20better=20than=20random=20m arking |Sender:=20 |To:=20; bh=8SVQM/2XpzjLTJRE+QNkSw3dhCzIYSjZGJGszHHXDd0=; b=fODZ72guD1SsXWBTU2fQPx4Rx5dC4AVjjW5a40rb06y0xG7Bxluh6umSZEptu0vbAi/95cQ3 z9A8Kb2U5nR6WJsVuLHLgJ8qFq2VpiARo5GlqvM6ACNWChMgCoIxw4Io; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: 0.0 (/) X-Scan-Signature: 2409bba43e9c8d580670fda8b695204a Cc: Stephen Hanly , PCN IETF list , Sammy Chan X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Lachlan, (cutting some text out where there seems to be agreement):=20 > Agreed. If "congestion" is a binary state then signalling can't help. > My (naive?) argument would be that in practice congestion =20 > isn't binary. If a link is operating very close to capacity,=20 > we should admit a small fraction of flows, if it is further=20 > from capacity we admit more flows. (When I think as a=20 > theoretician, I also think we can admit a very few flows when=20 > the link is overloaded, assuming that flows will depart=20 > continuously.) Achieving fairness may need the one-hop flows=20 > to average the congestion level over a time comparable to the=20 > duration of a flow before allowing a new flow to start. >=20 Well, the issue here is that the one-hop flows are not really one-hop flows - they are actually one "bottleneck" flow, but may in fact pass more non-congested links. And averaging over the duration of the flow seems scary if the flow is long (e.g. video stream)... It seems that if a solution were to try to deal with this, it would have to be aware of the number of bottlenecks traversed (this changes overtime, so tricky)... =20 In any case, I think we agree that machinery currently far from that being envisioned in the PCN context might be required to deal with the problem. Anna=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Wed Jul 25 17:46:02 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDogD-0005YI-Rc; Wed, 25 Jul 2007 17:46:01 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IDogC-0005YD-MR for pcn-confirm+ok@megatron.ietf.org; Wed, 25 Jul 2007 17:46:00 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IDogC-0005Y5-Ce for pcn@ietf.org; Wed, 25 Jul 2007 17:46:00 -0400 Received: from an-out-0708.google.com ([209.85.132.244]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IDogC-0005Pv-02 for pcn@ietf.org; Wed, 25 Jul 2007 17:46:00 -0400 Received: by an-out-0708.google.com with SMTP id c17so71874anc for ; Wed, 25 Jul 2007 14:45:59 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=A9DWy0EmDLclnSJPNInCTrDkjjxsfgFzMQdQRTX1fjO7UHNzP5meWR4a3syR/dC5yIkbdlUnH3qq5r5g6TkIB0BGKU+aH4NfWNDU3WQZMokMH3+5ifMsvYx1yhkdw15Df7WptBh6yMv4Jm+IpST24+uBgNXLZLhsLeVGP46j77g= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=hBtfdBVZRu+67yzlaWx0hPZ6cmfDqjBZIfK1bXkrFFPR27U4shzdd2wvM4sEsjyf5Caka6EgybaZDc9pQG67q8GWwDqLvhsZQwKDv+CfZsi5h2BBjcJCYOKiIjkxTB386JItch4P6+q9QI9xrtJDBbJ+3eEMSJLKkYMQUshQaLE= Received: by 10.100.94.3 with SMTP id r3mr655806anb.1185399959715; Wed, 25 Jul 2007 14:45:59 -0700 (PDT) Received: by 10.100.144.10 with HTTP; Wed, 25 Jul 2007 14:45:59 -0700 (PDT) Message-ID: Date: Wed, 25 Jul 2007 14:45:59 -0700 From: "Lachlan Andrew" To: "Anna Charny (acharny)" Subject: Re: [PCN] Marking scheme better than random marking In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: X-Spam-Score: 0.0 (/) X-Scan-Signature: 8b431ad66d60be2d47c7bfeb879db82c Cc: Stephen Hanly , PCN IETF list , Sammy Chan X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: l.andrew@ieee.org List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Greetings Anna, On 25/07/07, Anna Charny (acharny) wrote: > > Well, the issue here is that the one-hop flows are not really one-hop > flows - they are actually one "bottleneck" flow, but may in fact pass > more non-congested links. > It seems that > if a solution were to try to deal with this, it would have to be aware > of the number of bottlenecks traversed... I was assuming that the multi-bottleneck flows would also average the congestion level. Why would we need to consider the number of bottlenecks? > And averaging over the duration of the flow > seems scary if the flow is long (e.g. video stream)... Yes. It would certainly be bad to admit a flow when the load is currently high just because the half-hour average was low. Conversely, it seems scary to admit a half-hour flow because our rate has just dipped below a threshold. If our decision is to have an effect on timescale X, we should try to predict the network conditions over that timescale into the future. It isn't clear to me that the current conditions are a better estimate than the historical conditions (but again, I'm a newbie in this area). > In any case, I think we agree that machinery currently far from that > being envisioned in the PCN context might be required to deal with the > problem. I don't know the PCN charter, but if we provide the machinery for signalling of the current congestion level, actual admission rule can be left fairly flexible, can't it? If "Generation 1" equipment admits calls with a probability based on instantaneous rate, it will still interwork with "Generation 2" equipment which bases its admission probability on both instantaneous and long-term rate. Perhaps I am thinking like an IRTF person... >From a quick look at your draft, it seems that using ADPM for it (for the excess-rate signalling, as you said last email) preserves the code-point benefit of being a "single marking", but forfeits the benefit of using a token bucket. Cheers, Lachlan -- Lachlan Andrew Dept of Computer Science, Caltech 1200 E California Blvd, Mail Code 256-80, Pasadena CA 91125, USA Phone: +1 (626) 395-8820 Fax: +1 (626) 568-3603 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 07:50:28 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE1rP-0001Zq-Je; Thu, 26 Jul 2007 07:50:27 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE1rO-0001Zf-AM for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 07:50:26 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE1rN-0001ZS-SS for pcn@ietf.org; Thu, 26 Jul 2007 07:50:25 -0400 Received: from smtp5.smtp.bt.com ([217.32.164.139]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IE1rM-0003GJ-Bi for pcn@ietf.org; Thu, 26 Jul 2007 07:50:25 -0400 Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp5.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 12:50:23 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 12:50:23 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185450622258; Thu, 26 Jul 2007 12:50:22 +0100 Received: from mut.jungle.bt.co.uk ([10.86.5.78]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6QBoFQm012721; Thu, 26 Jul 2007 12:50:19 +0100 Message-Id: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Thu, 26 Jul 2007 12:49:37 +0100 To: "Michal Behringer" From: Bob Briscoe Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 26 Jul 2007 11:50:23.0695 (UTC) FILETIME=[267C35F0:01C7CF7B] X-Spam-Score: 0.0 (/) X-Scan-Signature: 82c9bddb247d9ba4471160a9a865a5f3 Cc: PCN IETF list , tsvwg IETF list Subject: [PCN] draft-behringer-tsvwg-rsvp-security-groupkeying: Scope? X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Michael, Last night I read this draft, which you will be presenting today in tsvwg. It was a useful tutorial for me, because I wasn't aware of all the group keying work for signalling that you describe. 1/ First a classic (picky?) security question: You talk about one RSVP node trusting the next. A future draft needs to answer the question "Trust to do what?" You seem to imply you mean "Trust to maintain the integrity of RSVP messages and to maintain the next link in the chain of integrity checking". And later you implicitly add "Trust to keep the contents of the RSVP messages secret" But, as this is a key management draft, you probably mean trust in message integrity _and_ semantics, ie "Trust to do all the things the RSVP protocol says you will do", e.g. things like traffic policing on behalf of others [RFC2210], protecting downstream RSVP nodes from overload [RFC2209] etc. 2/ WG Scope 2.1 PCN: Second, your draft is very relevant to the PCN working group. In PCN, the next RSVP hop is deliberately very distant from the previous one in IP hop terms. On Tue I raised this point and referred to your draft in my review of the PCN architecture: (long - scroll right to the last para). After yesterday's mtg, the PCN WG chairs are about to put this draft to the list for consideration as a WG item. The PCN WG scope is currently restricted to one domain. So only message integrity is relevant (so a node receiving a message knows it didn't come from some random user spoofing the neighbouring RSVP router). The PCN charter also says multi-domain should be kept in mind where it might change anything done for single domain. You'll see I also refer to the problem of trust in the semantics of reservation messages in my currently individual draft on solving (some) PCN security problems in a multi-domain scenario: 2.2 NSIS: I guess your draft is just as relevant to NSIS as to RSVP, but to remain concrete, you will probably want to just say that the scope is wider but focus on one signalling system. Bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 08:26:26 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE2QE-00040q-CR; Thu, 26 Jul 2007 08:26:26 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE2QD-0003za-43 for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 08:26:25 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE2QC-0003zS-Qe for pcn@ietf.org; Thu, 26 Jul 2007 08:26:24 -0400 Received: from mail.gmx.net ([213.165.64.20]) by ietf-mx.ietf.org with smtp (Exim 4.43) id 1IE2QB-0003ua-2u for pcn@ietf.org; Thu, 26 Jul 2007 08:26:24 -0400 Received: (qmail invoked by alias); 26 Jul 2007 12:26:21 -0000 Received: from dhcp-15f4.ietf69.org (EHLO [130.129.21.244]) [130.129.21.244] by mail.gmx.net (mp007) with SMTP; 26 Jul 2007 14:26:21 +0200 X-Authenticated: #29516787 X-Provags-ID: V01U2FsdGVkX1/TcY0tcBXTpSMKUaZpIWBDmEbQoo04IBFR7cyQfq 3cqmTQiW3vk3At Message-ID: <46A892EE.8040908@gmx.net> Date: Thu, 26 Jul 2007 14:26:22 +0200 From: Hannes Tschofenig User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: Bob Briscoe Subject: Re: [PCN] draft-behringer-tsvwg-rsvp-security-groupkeying: Scope? References: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> In-Reply-To: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-Spam-Score: 0.0 (/) X-Scan-Signature: b7b9551d71acde901886cc48bfc088a6 Cc: PCN IETF list , tsvwg IETF list , Michal Behringer X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Bob Briscoe wrote: > Michael, > > Last night I read this draft, which you will be presenting today in > tsvwg. > > It was a useful tutorial for me, because I wasn't aware of all the > group keying work for signalling that you describe. > > 1/ First a classic (picky?) security question: You talk about one RSVP > node trusting the next. A future draft needs to answer the question > "Trust to do what?" > > You seem to imply you mean "Trust to maintain the integrity of RSVP > messages and to maintain the next link in the chain of integrity > checking". And later you implicitly add "Trust to keep the contents of > the RSVP messages secret" > > But, as this is a key management draft, you probably mean trust in > message integrity _and_ semantics, ie "Trust to do all the things the > RSVP protocol says you will do", e.g. things like traffic policing on > behalf of others [RFC2210], protecting downstream RSVP nodes from > overload [RFC2209] etc. > The term "trust" is always confusing. In short: You want to deal with a modified threat model in RSVP where you would like to protect the communication between RSVP nodes when they traverse non-RSVP nodes. > 2/ WG Scope > > 2.1 PCN: Second, your draft is very relevant to the PCN working group. > In PCN, the next RSVP hop is deliberately very distant from the > previous one in IP hop terms. On Tue I raised this point and referred > to your draft in my review of the PCN architecture: > > (long - scroll right to the last para). > After yesterday's mtg, the PCN WG chairs are about to put this draft > to the list for consideration as a WG item. > > The PCN WG scope is currently restricted to one domain. So only > message integrity is relevant (so a node receiving a message knows it > didn't come >> from some random user spoofing the neighbouring RSVP router). > > The PCN charter also says multi-domain should be kept in mind where it > might change anything done for single domain. You'll see I also refer > to the problem of trust in the semantics of reservation messages in my > currently individual draft on solving (some) PCN security problems in > a multi-domain scenario: > > I also think that PCN is a good use case for Michael's draft. > 2.2 NSIS: I guess your draft is just as relevant to NSIS as to RSVP, > but to remain concrete, you will probably want to just say that the > scope is wider but focus on one signalling system. > No; it is isn't relevant based on how NSIS works. It does provide this functionality already but in a different way. Ciao Hannes > > Bob > > > ____________________________________________________________________________ > > Bob Briscoe, Networks Research Centre, BT > Research > B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 > 645196 > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 08:46:07 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE2jH-0000ti-63; Thu, 26 Jul 2007 08:46:07 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE2jF-0000sg-7Y for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 08:46:05 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE2jE-0000sM-K6; Thu, 26 Jul 2007 08:46:04 -0400 Received: from ams-iport-1.cisco.com ([144.254.224.140]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IE2jD-0004OE-5R; Thu, 26 Jul 2007 08:46:04 -0400 Received: from ams-dkim-2.cisco.com ([144.254.224.139]) by ams-iport-1.cisco.com with ESMTP; 26 Jul 2007 14:46:02 +0200 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAGg0qEaQ/uCLZmdsb2JhbACPaAsKJA X-IronPort-AV: i="4.16,584,1175464800"; d="scan'208"; a="149071659:sNHT33138758" Received: from ams-core-1.cisco.com (ams-core-1.cisco.com [144.254.224.150]) by ams-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id l6QCk2lo001990; Thu, 26 Jul 2007 14:46:02 +0200 Received: from xbh-ams-331.emea.cisco.com (xbh-ams-331.cisco.com [144.254.231.71]) by ams-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6QCjklF029487; Thu, 26 Jul 2007 12:46:01 GMT Received: from xfe-ams-331.emea.cisco.com ([144.254.231.72]) by xbh-ams-331.emea.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 14:45:46 +0200 Received: from [172.28.168.46] ([10.61.64.162]) by xfe-ams-331.emea.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 14:45:46 +0200 In-Reply-To: <46A892EE.8040908@gmx.net> References: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> <46A892EE.8040908@gmx.net> Mime-Version: 1.0 (Apple Message framework v752.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <37BC7597-1DDF-4831-9EE2-F5FC90F9C5D0@cisco.com> Content-Transfer-Encoding: 7bit From: Francois Le Faucheur IMAP Subject: Re: [PCN] draft-behringer-tsvwg-rsvp-security-groupkeying: Scope? Date: Thu, 26 Jul 2007 07:42:46 -0500 To: Hannes Tschofenig X-Mailer: Apple Mail (2.752.3) X-OriginalArrivalTime: 26 Jul 2007 12:45:46.0238 (UTC) FILETIME=[E2E009E0:01C7CF82] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=377; t=1185453962; x=1186317962; c=relaxed/simple; s=amsdkim2001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=flefauch@cisco.com; z=From:=20Francois=20Le=20Faucheur=20IMAP=20 |Subject:=20Re=3A=20[PCN]=20draft-behringer-tsvwg-rsvp-security-groupkeyi ng=3A=20Scope? |Sender:=20; bh=LmHM/2ZlQU9DHO+FO76QM008JPpG2saNxXJYgBFqj70=; b=vcaVfmnIXRZDvl3pZXCUgnvca/9pJPGLx/H8d8g/YTUAJeilpXh/Y8T8qP7MU5z3cgPjrwpT 1MS1j5w8+PGN6hfKg91xi9upU4x3GjATVjpzdxgNEHQbLlPudnTCWnFV; Authentication-Results: ams-dkim-2; header.From=flefauch@cisco.com; dkim=pass ( sig from cisco.com/amsdkim2001 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: 7a6398bf8aaeabc7a7bb696b6b0a2aad Cc: PCN IETF list , Michal Behringer , tsvwg IETF list X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, >> > I also think that PCN is a good use case for Michael's draft. Group keying should come in handy for any form of "aggregation" where RSVP nodes are separated by an aggregation cloud and where the Aggregator does not know ahead of time what is the Deaggregator. So besides PCN, it should also be applicable to RFC3175 and RFC4860. Cheers Francois _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 09:13:40 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE39w-0006uU-Hk; Thu, 26 Jul 2007 09:13:40 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE39v-0006uO-9X for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 09:13:39 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE39u-0006uG-VX for pcn@ietf.org; Thu, 26 Jul 2007 09:13:38 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IE39t-0004ze-Fl for pcn@ietf.org; Thu, 26 Jul 2007 09:13:38 -0400 Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 14:13:36 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 13:54:34 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185454467876; Thu, 26 Jul 2007 13:54:27 +0100 Received: from mut.jungle.bt.co.uk ([10.86.5.78]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6QCsD9N013238; Thu, 26 Jul 2007 13:54:24 +0100 Message-Id: <5.2.1.1.2.20070726135405.04dca858@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Thu, 26 Jul 2007 13:54:28 +0100 To: Hannes Tschofenig From: Bob Briscoe Subject: Re: [PCN] draft-behringer-tsvwg-rsvp-security-groupkeying: Scope? In-Reply-To: <46A892EE.8040908@gmx.net> References: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 26 Jul 2007 12:54:34.0365 (UTC) FILETIME=[1DA9D2D0:01C7CF84] X-Spam-Score: 0.0 (/) X-Scan-Signature: 79899194edc4f33a41f49410777972f8 Cc: PCN IETF list , tsvwg IETF list , Michal Behringer X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hannes, At 13:26 26/07/2007, Hannes Tschofenig wrote: >>2.2 NSIS: I guess your draft is just as relevant to NSIS as to RSVP, but >>to remain concrete, you will probably want to just say that the scope is >>wider but focus on one signalling system. >No; it is isn't relevant based on how NSIS works. It does provide this >functionality already but in a different way. ref? I'm interested. bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 09:47:53 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE3h2-00061b-Ot; Thu, 26 Jul 2007 09:47:52 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE3h1-00060r-13 for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 09:47:51 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE3h0-00060C-H9 for pcn@ietf.org; Thu, 26 Jul 2007 09:47:50 -0400 Received: from mail.gmx.net ([213.165.64.20]) by chiedprmail1.ietf.org with smtp (Exim 4.43) id 1IE3gz-0004QT-QM for pcn@ietf.org; Thu, 26 Jul 2007 09:47:50 -0400 Received: (qmail invoked by alias); 26 Jul 2007 13:47:48 -0000 Received: from dhcp-15f4.ietf69.org (EHLO [130.129.21.244]) [130.129.21.244] by mail.gmx.net (mp053) with SMTP; 26 Jul 2007 15:47:48 +0200 X-Authenticated: #29516787 X-Provags-ID: V01U2FsdGVkX18gusU3s3gghmqAJDtDwY3NBQ07key3W7fL9ML7Qd 5/SGBC23lTsOe1 Message-ID: <46A8A606.6070608@gmx.net> Date: Thu, 26 Jul 2007 15:47:50 +0200 From: Hannes Tschofenig User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: Francois Le Faucheur IMAP Subject: Re: [PCN] draft-behringer-tsvwg-rsvp-security-groupkeying: Scope? References: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> <46A892EE.8040908@gmx.net> <37BC7597-1DDF-4831-9EE2-F5FC90F9C5D0@cisco.com> In-Reply-To: <37BC7597-1DDF-4831-9EE2-F5FC90F9C5D0@cisco.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-Spam-Score: 0.0 (/) X-Scan-Signature: 856eb5f76e7a34990d1d457d8e8e5b7f Cc: PCN IETF list , tsvwg IETF list , Michal Behringer X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Francois, >> I also think that PCN is a good use case for Michael's draft. > > Group keying should come in handy for any form of "aggregation" where > RSVP nodes are separated by an aggregation cloud and where the > Aggregator does not know ahead of time what is the Deaggregator. So > besides PCN, it should also be applicable to RFC3175 and RFC4860. > I agree with you. Ciao Hannes > Cheers > > Francois _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 09:50:25 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE3jV-00073o-IN; Thu, 26 Jul 2007 09:50:25 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE3jT-00072V-Uv for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 09:50:23 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE3jT-000729-74 for pcn@ietf.org; Thu, 26 Jul 2007 09:50:23 -0400 Received: from mail.gmx.net ([213.165.64.20]) by chiedprmail1.ietf.org with smtp (Exim 4.43) id 1IE3jS-0004UK-Eg for pcn@ietf.org; Thu, 26 Jul 2007 09:50:22 -0400 Received: (qmail invoked by alias); 26 Jul 2007 13:50:20 -0000 Received: from dhcp-15f4.ietf69.org (EHLO [130.129.21.244]) [130.129.21.244] by mail.gmx.net (mp008) with SMTP; 26 Jul 2007 15:50:20 +0200 X-Authenticated: #29516787 X-Provags-ID: V01U2FsdGVkX1/I6KcTK4TI0Mqug5lNi/gRZcXGGUVLp1NH1da3fE N1E73FraYx0qnP Message-ID: <46A8A69E.6030706@gmx.net> Date: Thu, 26 Jul 2007 15:50:22 +0200 From: Hannes Tschofenig User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: Bob Briscoe Subject: Re: [PCN] draft-behringer-tsvwg-rsvp-security-groupkeying: Scope? References: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> <5.2.1.1.2.20070726135405.04dca858@pop3.jungle.bt.co.uk> In-Reply-To: <5.2.1.1.2.20070726135405.04dca858@pop3.jungle.bt.co.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-Spam-Score: 0.0 (/) X-Scan-Signature: b19722fc8d3865b147c75ae2495625f2 Cc: PCN IETF list , tsvwg IETF list , Michal Behringer X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Bob, Bob Briscoe wrote: > Hannes, > > At 13:26 26/07/2007, Hannes Tschofenig wrote: >>> 2.2 NSIS: I guess your draft is just as relevant to NSIS as to RSVP, >>> but to remain concrete, you will probably want to just say that the >>> scope is wider but focus on one signalling system. >> No; it is isn't relevant based on how NSIS works. It does provide >> this functionality already but in a different way. > > ref? I'm interested. > The functionality was dumped into the main specification: http://www.ietf.org/internet-drafts/draft-ietf-nsis-ntlp-14.txt Let me know if you need a bit of background. Ciao Hannes > > bob > > > ____________________________________________________________________________ > > Bob Briscoe, Networks Research Centre, BT > Research > B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 > 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 09:50:33 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE3jd-0007MD-Dk; Thu, 26 Jul 2007 09:50:33 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE3ja-0007CP-Kg for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 09:50:31 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE3ja-0007CD-8t for pcn@ietf.org; Thu, 26 Jul 2007 09:50:30 -0400 Received: from mail.gmx.net ([213.165.64.20]) by ietf-mx.ietf.org with smtp (Exim 4.43) id 1IE3jY-0005od-Os for pcn@ietf.org; Thu, 26 Jul 2007 09:50:30 -0400 Received: (qmail invoked by alias); 26 Jul 2007 13:50:27 -0000 Received: from dhcp-15f4.ietf69.org (EHLO [130.129.21.244]) [130.129.21.244] by mail.gmx.net (mp041) with SMTP; 26 Jul 2007 15:50:27 +0200 X-Authenticated: #29516787 X-Provags-ID: V01U2FsdGVkX184sGFaHq04VEbNzeKZ56nV0i/FGD5iwTs9OMakng rA8EzbFDqpqFkt Message-ID: <46A8A6A5.4000604@gmx.net> Date: Thu, 26 Jul 2007 15:50:29 +0200 From: Hannes Tschofenig User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: Bob Briscoe Subject: Re: [PCN] draft-behringer-tsvwg-rsvp-security-groupkeying: Scope? References: <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> <5.2.1.1.2.20070726121842.04ce46a0@pop3.jungle.bt.co.uk> <5.2.1.1.2.20070726135405.04dca858@pop3.jungle.bt.co.uk> In-Reply-To: <5.2.1.1.2.20070726135405.04dca858@pop3.jungle.bt.co.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-Spam-Score: 0.0 (/) X-Scan-Signature: b19722fc8d3865b147c75ae2495625f2 Cc: PCN IETF list , tsvwg IETF list , Michal Behringer X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Bob, Bob Briscoe wrote: > Hannes, > > At 13:26 26/07/2007, Hannes Tschofenig wrote: >>> 2.2 NSIS: I guess your draft is just as relevant to NSIS as to RSVP, >>> but to remain concrete, you will probably want to just say that the >>> scope is wider but focus on one signalling system. >> No; it is isn't relevant based on how NSIS works. It does provide >> this functionality already but in a different way. > > ref? I'm interested. > The functionality was dumped into the main specification: http://www.ietf.org/internet-drafts/draft-ietf-nsis-ntlp-14.txt Let me know if you need a bit of background. Ciao Hannes > > bob > > > ____________________________________________________________________________ > > Bob Briscoe, Networks Research Centre, BT > Research > B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 > 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 11:27:23 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE5FL-0004kg-12; Thu, 26 Jul 2007 11:27:23 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE5FJ-0004kK-Aw for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 11:27:21 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE5FI-0004jv-W1 for pcn@ietf.org; Thu, 26 Jul 2007 11:27:20 -0400 Received: from rtp-iport-2.cisco.com ([64.102.122.149]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IE5FH-0000bn-Nt for pcn@ietf.org; Thu, 26 Jul 2007 11:27:20 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-2.cisco.com with ESMTP; 26 Jul 2007 11:27:14 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CACdaqEZAZnme/2dsb2JhbAA X-IronPort-AV: i="4.16,584,1175486400"; d="scan'208"; a="127110760:sNHT3185423256" Received: from rtp-core-2.cisco.com (rtp-core-2.cisco.com [64.102.124.13]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6QFRDM0021269 for ; Thu, 26 Jul 2007 11:27:13 -0400 Received: from xbh-rtp-201.amer.cisco.com (xbh-rtp-201.cisco.com [64.102.31.12]) by rtp-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id l6QFQvEh023917 for ; Thu, 26 Jul 2007 15:27:13 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 11:27:09 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Thu, 26 Jul 2007 11:27:08 -0400 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Corrupted version of draft-charny-pcn-single-marking replaced in the repository Thread-Index: AcfPmW4Ygrr2XYgMTDaMawvmUNzeRw== From: "Anna Charny \(acharny\)" To: "PCN IETF list" X-OriginalArrivalTime: 26 Jul 2007 15:27:09.0792 (UTC) FILETIME=[6EB91E00:01C7CF99] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=159; t=1185463634; x=1186327634; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20Corrupted=20version=20of=20=20draft-charny-pcn-single-marking =20replaced=20in=20the=20repository |Sender:=20 |To:=20=22PCN=20IETF=20list=22=20; bh=k0Y7FfqYCUOPiiQDOOAY4awcvNKLwrhSDyTlnSFamUY=; b=Y3KsTqjaU1rtrjtsSx0SZs40M0T8UFwUZUqaKjwnOx1QFiStG5rQ1KMHvxN/oh37klS3XYT7 Ob2Grd2DoCGCf/8xQnrn3C1F9GMYs51xrd6TLAjmzkTRHfiBP3jKwhwb; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: 8ac499381112328dd60aea5b1ff596ea Subject: [PCN] Corrupted version of draft-charny-pcn-single-marking replaced in the repository X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi all, Just a quick note that the corrupted version of the above draft has finally been replaced in the ietf repository by a good version.=20 Anna=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 11:42:48 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE5UG-0000WI-2M; Thu, 26 Jul 2007 11:42:48 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IE5UF-0000T1-1q for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 11:42:47 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IE5UE-0000Sn-O5 for pcn@ietf.org; Thu, 26 Jul 2007 11:42:46 -0400 Received: from rtp-iport-2.cisco.com ([64.102.122.149]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IE5UD-0001F8-IM for pcn@ietf.org; Thu, 26 Jul 2007 11:42:46 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-2.cisco.com with ESMTP; 26 Jul 2007 11:42:45 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAGxdqEZAZnme/2dsb2JhbAA X-IronPort-AV: i="4.16,584,1175486400"; d="scan'208"; a="127115825:sNHT29245560" Received: from rtp-core-2.cisco.com (rtp-core-2.cisco.com [64.102.124.13]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6QFgjcM009694 for ; Thu, 26 Jul 2007 11:42:45 -0400 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id l6QFgjEZ029006 for ; Thu, 26 Jul 2007 15:42:45 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 11:42:44 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Thu, 26 Jul 2007 11:42:43 -0400 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: A draft consolidating different PCN proposals Thread-Index: AcfPm5uLE3qvkh/CRFSi0EwPez44dA== From: "Anna Charny \(acharny\)" To: "PCN IETF list" X-OriginalArrivalTime: 26 Jul 2007 15:42:44.0755 (UTC) FILETIME=[9C012630:01C7CF9B] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=1081; t=1185464565; x=1186328565; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20A=20draft=20consolidating=20different=20PCN=20proposals |Sender:=20 |To:=20=22PCN=20IETF=20list=22=20; bh=EnTIo7e7D3EiJ2osc9Zg6X0ru/ClWzd5VwEAiWAbY38=; b=XtlpAwa6FQ8uvCPQiDgSw2mvVvIANLKx1f+0YoFItm9SzQsfM/da3e2RY0T9FY899shZIaSL u/4ubURxVir+1heHEuWpx8M2gs3GsveInsFk2yAkLtLmJg1OBCiL/xNn; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: 93238566e09e6e262849b4f805833007 Subject: [PCN] A draft consolidating different PCN proposals X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi all, Following the discussion in the PCN WG meeting yesterday and as a result of follow-up hallway discussions, the authors of various proposals seem to have come up with a common language to describe all the different PCN proposals and a preliminary view on their relative cons and pros. I have volunteered to produce a consolidated draft which will attempt to discuss all current proposals in the same framework and take the first cut on comparison criteria and how it is met by different approaches. =20 We already have a number of comparison criteria loosely used in discussions. I am requesting feedback from the list with suggestions for specific performance criteria suggestions. Those who have already sent those to me privately may wish to resend them to the list.=20 I am also requesting that the authors of each proposed mechanism send their view of the cons and pros they see of their specific approach (functional, deployment, performance, etc). Of course similar feedback is also welcome from the entire list. Thank you, Anna=20 =20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 16:35:04 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEA35-0000OM-UQ; Thu, 26 Jul 2007 16:35:03 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEA34-0000MK-FZ for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 16:35:02 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEA33-0000L9-Ot for pcn@ietf.org; Thu, 26 Jul 2007 16:35:01 -0400 Received: from smtp5.smtp.bt.com ([217.32.164.139]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEA32-000076-A1 for pcn@ietf.org; Thu, 26 Jul 2007 16:35:01 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp5.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 21:34:59 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Date: Thu, 26 Jul 2007 21:34:58 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA50132C138@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: PCN & ECN-(congestion experienced) interactions Thread-Index: AcfOTJNiDbXXskhTRKOfZp0Z2OHPEQBTiysX References: <5.2.1.1.2.20070724140627.03c06a58@pop3.jungle.bt.co.uk> From: To: X-OriginalArrivalTime: 26 Jul 2007 20:34:59.0377 (UTC) FILETIME=[6F742210:01C7CFC4] X-Spam-Score: 0.0 (/) X-Scan-Signature: 0a7aa2e6e558383d84476dc338324fab Subject: [PCN] PCN & ECN-(congestion experienced) interactions X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org hi, wanted to pick up on a couple of issues raised by bob briscoe in his = review of eardley-pcn-architecture; the 2nd one also relevant for = chan-pcn-encoding-comparison. the first is about whether a PCN-interior-node can ECN-mark (as = congestion expereinced) PCN-pkts.=20 Bob says: >>The [xxxxx] text implies (to me) that a PCN-interior router might do = PCN marking _and_ also ECN marking just before drop. That also imposes a = requirement on the encoding to be able to carry either in the same = field. I don't think the authors meant either of these implications. So = somewhere, the relation between PCN & ECN marking should be stated.<< bob is right (in my opinion), we didnt mean this and it needs some = word-smithing. IE draft will be adjusted to say that it is assumed that = a PCN-interior-node doesnt have the ability to perform ECN-marking on = PCN-traffic. it can only do PCN-marking.=20 the second issue is about what happens if traffic arrives at the = PCN-domain (for the PCN traffic class) that is already marked with ECN's = CE codepoint (congestion experienced). ie the issue is how to handle = traffic which for some reason is using ECN (end-to-end) and also using = PCN admission control (across the PCN-domain). this could be an issue = for the pcn-architecture draft, and also for the chan-pcn-encoding one. = certainly it's an issue that's got to be dealt with by at least one of = these drafts. bob says: >>Although this is perhaps too detailed for the architecture, I suggest = that any need for ECN marking on the same path but outside the PCN = domain(s) should be handled by tunnelling across the PCN domain, with a = non-PCN DSCP in the inner header (that turns on the RFC3168 meaning of = its ECN field) and a PCN DSCP in the outer.>> one possibility is to deal with this now, with the wording along the = lines that bob suggests above added to the architecture draft. basically = say that a solution on these lines would solve the problem (there may be = others but we won't think about them). another possibility is that the encoding comparison draft includes a = look at the implications of a pkt being able to be PCN-marked whilst = preserving its ECN-CE - ie the effect in terms of how the PCN-encoding = is done. we could end up deciding that it was worthwhile, orthat it = wasn't worthwhile. In the latter case we would go back to bob's solution = above.=20 do people feel able to make a decision now to go for the first = possibility (as bob suggests - I'd be OK with this too) or do we want = discussion within the encoding-comparisons draft? thanks, phil =20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 17:27:03 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEArO-00031S-KY; Thu, 26 Jul 2007 17:27:02 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEArM-00031E-Vm for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 17:27:00 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEArM-000316-ME for pcn@ietf.org; Thu, 26 Jul 2007 17:27:00 -0400 Received: from zrtps0kn.nortel.com ([47.140.192.55]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEArM-000129-2d for pcn@ietf.org; Thu, 26 Jul 2007 17:27:00 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kn.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6QLQvo26415; Thu, 26 Jul 2007 21:26:57 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] PCN & ECN-(congestion experienced) interactions Date: Thu, 26 Jul 2007 17:26:56 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB646511754474@zcarhxm1.corp.nortel.com> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA50132C138@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] PCN & ECN-(congestion experienced) interactions Thread-Index: AcfOTJNiDbXXskhTRKOfZp0Z2OHPEQBTiysXAAqlRpA= References: <5.2.1.1.2.20070724140627.03c06a58@pop3.jungle.bt.co.uk> <75A199C5D243C741BF3D3F1EBCEF9BA50132C138@E03MVZ1-UKDY.domain1.systemhost.net> From: "Jozef Babiarz" To: , X-Spam-Score: 0.0 (/) X-Scan-Signature: 5011df3e2a27abcc044eaa15befcaa87 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Phil and all see below. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com]=20 Sent: July 26, 2007 4:35 PM To: pcn@ietf.org Subject: [PCN] PCN & ECN-(congestion experienced) interactions hi, >wanted to pick up on a couple of issues raised by bob briscoe in his review >of eardley-pcn-architecture; the 2nd one also relevant for chan-pcn-[Joe] >encoding-comparison. >the first is about whether a PCN-interior-node can ECN-mark (as [Joe] >congestion expereinced) PCN-pkts.=20 >Bob says: >>>The [xxxxx] text implies (to me) that a PCN-interior router might do PCN >marking _and_ also ECN marking just before drop. That also imposes a [Joe] >requirement on the encoding to be able to carry either in the same field. I >don't think the authors meant either of these implications. So somewhere, >the relation between PCN & ECN marking should be stated.<< >bob is right (in my opinion), we didnt mean this and it needs some word >smithing. IE draft will be adjusted to say that it is assumed that a PCN >interior-node doesnt have the ability to perform ECN-marking on PCN-[Joe] >traffic it can only do PCN-marking.=20 [Joe] Yes. I would agree with that. I think that by ECN-marking you mean applying the marking behavior as defined in RFC 3168.=20 >the second issue is about what happens if traffic arrives at the PCN-domain >(for the PCN traffic class) that is already marked with ECN's CE codepoint >(congestion experienced). ie the issue is how to handle traffic which for >some reason is using ECN (end-to-end) and also using PCN admission control >(across the PCN-domain). this could be an issue for the pcn-architecture >draft, and also for the chan-pcn-encoding one. certainly it's an issue >that's got to be dealt with by at least one of these drafts. [Joe] If a packet belonging to a PCN-capable flow arrives at the PCN-domain, the ECN field should not be touched. What ever the encoding of the bits is it is forwarded that way. OK, I'm assuming that PCN can be end-to-end some day. However, if packet belonging to a flow that is not PCN-traffic arrives at the PCN-domain it gets forwarded using a different forwarding class (DSCP) than what is used for PCN traffic. The PCN-domain uses Diffserv to provide the differentiation. Only PCN traffic get's the PCN treatment. >bob says: >>>Although this is perhaps too detailed for the architecture, I suggest >that any need for ECN marking on the same path but outside the PCN [Joe] >domain(s) should be handled by tunnelling across the PCN domain, with a >non-PCN DSCP in the inner header (that turns on the RFC3168 meaning of its >ECN field) and a PCN DSCP in the outer.>> [Joe] I do not understand. I though that we state that we would use Diffserv. Why tunnel? >one possibility is to deal with this now, with the wording along the lines >that bob suggests above added to the architecture draft. basically say that >a solution on these lines would solve the problem (there may be others but >we won't think about them). [Joe] We do not need to tunnel. >another possibility is that the encoding comparison draft includes a look >at the implications of a pkt being able to be PCN-marked whilst preserving >its ECN-CE - ie the effect in terms of how the PCN-encoding is done. we >could end up deciding that it was worthwhile, orthat it wasn't worthwhile. >In the latter case we would go back to bob's solution above.=20 [Joe] Let's do it in the architecture draft. The marking draft should be only a survey of viable marking options.=20 >do people feel able to make a decision now to go for the first possibility >(as bob suggests - I'd be OK with this too) or do we want discussion within >the encoding-comparisons draft? [Joe] We do not need to mix ECN marking behavior and PCN marking behavior. My assumption is that we where going to use Diffserv and DS codepoints to separate traffic that is PCN-capable from traffic that is not PCN-capable. >thanks, phil =20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 19:34:00 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IECqG-0006Hf-J1; Thu, 26 Jul 2007 19:34:00 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IECqD-0006HX-R4 for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 19:33:57 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IECqC-0006HO-VQ for pcn@ietf.org; Thu, 26 Jul 2007 19:33:57 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IECqB-0003FJ-CQ for pcn@ietf.org; Thu, 26 Jul 2007 19:33:56 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 00:33:54 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] PCN & ECN-(congestion experienced) interactions Date: Fri, 27 Jul 2007 00:33:53 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA50132C141@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] PCN & ECN-(congestion experienced) interactions Thread-Index: AcfOTJNiDbXXskhTRKOfZp0Z2OHPEQBTiysXAAqlRpAABNx3KQ== References: <5.2.1.1.2.20070724140627.03c06a58@pop3.jungle.bt.co.uk> <75A199C5D243C741BF3D3F1EBCEF9BA50132C138@E03MVZ1-UKDY.domain1.systemhost.net> <9671A92C3C8B5744BC97F855F7CB646511754474@zcarhxm1.corp.nortel.com> From: To: , X-OriginalArrivalTime: 26 Jul 2007 23:33:54.0039 (UTC) FILETIME=[6DCF9070:01C7CFDD] X-Spam-Score: 0.0 (/) X-Scan-Signature: 2857c5c041d6c02d7181d602c22822c8 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org joe sorry i explained it badly, let me have another go. The scenario i was thinking of is this. We have a source sending data to = a receiver. somewhere in the middle between the Sx & Rx is a PCN-domain. = The traffic being sent is treated as PCN-traffic inside the PCN-domain = ie put into the PCN Diffserv class. However, between the Sx and = PCN-domain the traffic is treated in a class that can be ECN-marked. = When the traffic reaches the Rx, should any ECN-marking (that happened = before the PCN-domain) be preserved.=20 =20 One possibility is that this is a scenario that we don't need to worry = about. If it is one we need to think about, then there are two = possibilities for how PCN WG could think about it: (1) when such traffic reaches the PCN-domain, then tunnel it across the = PCN-domain. this means that upon decapsulation at the egress any ECN-CE = marking (that was there when the pkt reached the ingress) is preserved.=20 (2) devise an encoding scheme for PCN that preserves the ECN-CE marking. these are the two possibilities i was trying to lay out in my original = email, ie (1) deal with the issue in the architecture doc by saying a tunnelling = solution could be done to solve the problem=20 (2) in the encoding-comparison doc, examine what the impact of this = would be on PCN-encoding (to inform the eventual choice of encoding) =20 phil =20 ________________________________ From: Jozef Babiarz [mailto:babiarz@nortel.com] Sent: Thu 26/07/2007 22:26 To: Eardley,PL,Philip,CXR9 R; pcn@ietf.org Subject: RE: [PCN] PCN & ECN-(congestion experienced) interactions Phil and all see below. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] Sent: July 26, 2007 4:35 PM To: pcn@ietf.org Subject: [PCN] PCN & ECN-(congestion experienced) interactions >the second issue is about what happens if traffic arrives at the PCN-domain >(for the PCN traffic class) that is already marked with ECN's CE codepoint >(congestion experienced). ie the issue is how to handle traffic which for >some reason is using ECN (end-to-end) and also using PCN admission control >(across the PCN-domain). this could be an issue for the pcn-architecture >draft, and also for the chan-pcn-encoding one. certainly it's an issue >that's got to be dealt with by at least one of these drafts. [Joe] If a packet belonging to a PCN-capable flow arrives at the PCN-domain, the ECN field should not be touched. What ever the encoding of the bits is it is forwarded that way. OK, I'm assuming that PCN can be end-to-end some day. However, if packet belonging to a flow that is not PCN-traffic arrives at the PCN-domain it gets forwarded using a different forwarding class (DSCP) than what is used for PCN traffic. The PCN-domain uses Diffserv to provide the differentiation. Only PCN traffic get's the PCN treatment. >bob says: >>>Although this is perhaps too detailed for the architecture, I suggest >that any need for ECN marking on the same path but outside the PCN [Joe] >domain(s) should be handled by tunnelling across the PCN domain, with a >non-PCN DSCP in the inner header (that turns on the RFC3168 meaning of its >ECN field) and a PCN DSCP in the outer.>> [Joe] I do not understand. I though that we state that we would use Diffserv. Why tunnel? >one possibility is to deal with this now, with the wording along the lines >that bob suggests above added to the architecture draft. basically say that >a solution on these lines would solve the problem (there may be others but >we won't think about them). [Joe] We do not need to tunnel. >another possibility is that the encoding comparison draft includes a look >at the implications of a pkt being able to be PCN-marked whilst preserving >its ECN-CE - ie the effect in terms of how the PCN-encoding is done. we >could end up deciding that it was worthwhile, orthat it wasn't worthwhile. >In the latter case we would go back to bob's solution above. [Joe] Let's do it in the architecture draft. The marking draft should be only a survey of viable marking options. >do people feel able to make a decision now to go for the first possibility >(as bob suggests - I'd be OK with this too) or do we want discussion within >the encoding-comparisons draft? [Joe] We do not need to mix ECN marking behavior and PCN marking behavior. My assumption is that we where going to use Diffserv and DS codepoints to separate traffic that is PCN-capable from traffic that is not PCN-capable. >thanks, phil _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 19:36:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IECsP-0007b9-Aq; Thu, 26 Jul 2007 19:36:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IECsO-0007aY-EG for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 19:36:12 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IECsO-0007aA-3x for pcn@ietf.org; Thu, 26 Jul 2007 19:36:12 -0400 Received: from smtp5.smtp.bt.com ([217.32.164.139]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IECsM-0003In-Ll for pcn@ietf.org; Thu, 26 Jul 2007 19:36:12 -0400 Received: from E03MVZ1-UKDY.domain1.systemhost.net ([193.113.30.61]) by smtp5.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 00:36:10 +0100 x-mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Fri, 27 Jul 2007 00:35:49 +0100 Message-ID: <75A199C5D243C741BF3D3F1EBCEF9BA50132C142@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: AcfOTym29onBXBPATvqVWos0hWdioABjoizD References: <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> From: To: X-OriginalArrivalTime: 26 Jul 2007 23:36:10.0093 (UTC) FILETIME=[BEE7C1D0:01C7CFDD] X-Spam-Score: 0.0 (/) X-Scan-Signature: 3e15cc4fdc61d7bce84032741d11c8e5 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org sounds good, will add bullet on these lines thanks phil ________________________________ From: Briscoe,RJ,Bob,XVR9 BRISCORJ R Sent: Wed 25/07/2007 01:03 To: Eardley,PL,Philip,CXR9 R Cc: pcn@ietf.org Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Phil & other authors, Just thought of one more possible gap: Another bullet for the Intro: o QoS reservations are decoupled from routing system (within the PCN domain). I.e. admission control lays reserved traffic over routes given = by the routing system without any pinning. Then if any of capacity, routing = or topology changes, the routing system just moves all traffic, so reserved flows that can gracefully continue after a short disruption will do. We don't trigger any messages from the routing system to the QoS system to = say routing has changed. So we don't have to deal with losing these messages during disastrous events, or with authenticating such messages. [Of course, then, if there isn't enough capacity for the previously admitted traffic after - both a capacity, routing or topology change - and after the routing and protection system has had a chance to bring = in new capacity or re-arrange the routing to fit, then flow termination can bring the system back below its max operating = point.] Bob _________________________________________________________________________= ___ Bob Briscoe, Networks Research Centre, BT = Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 = 645196=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Thu Jul 26 22:57:45 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEG1N-0004H3-TR; Thu, 26 Jul 2007 22:57:41 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEG1N-0004Gy-8H for pcn-confirm+ok@megatron.ietf.org; Thu, 26 Jul 2007 22:57:41 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEG1M-0004Gq-U0 for pcn@ietf.org; Thu, 26 Jul 2007 22:57:40 -0400 Received: from sj-iport-6.cisco.com ([171.71.176.117]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEG1M-0007BW-0S for pcn@ietf.org; Thu, 26 Jul 2007 22:57:40 -0400 Received: from sj-dkim-4.cisco.com ([171.71.179.196]) by sj-iport-6.cisco.com with ESMTP; 26 Jul 2007 19:57:39 -0700 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CANr7qEarR7PE/2dsb2JhbAA X-IronPort-AV: i="4.16,586,1175497200"; d="scan'208"; a="189453944:sNHT34597467" Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-4.cisco.com (8.12.11/8.12.11) with ESMTP id l6R2vdod008554; Thu, 26 Jul 2007 19:57:39 -0700 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id l6R2v96U029495; Fri, 27 Jul 2007 02:57:39 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 22:57:25 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Thu, 26 Jul 2007 22:57:24 -0400 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Some clarification questions about draft-westberg-pcn-load-control Thread-Index: AcfP+dvgBEbzyqgKR8Wx4houoQEXqw== From: "Anna Charny \(acharny\)" To: , "Lars Westberg \(KI/EAB\)" X-OriginalArrivalTime: 27 Jul 2007 02:57:25.0799 (UTC) FILETIME=[DC964370:01C7CFF9] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=4895; t=1185505059; x=1186369059; c=relaxed/simple; s=sjdkim4002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20Some=20clarification=20questions=20about=20draft-westberg-pcn -load-control |Sender:=20; bh=q3AKtyVdvnjDX+wnmvKpCsMoeEHPUl77LbIvyX74rVs=; b=WH3lQbOuI9kUsj0ayo9ACbLr5G3MFw77yN1XFpyAvi7OQhdinvrcaI2qjXHnzCbSy5dwwZub l01+gr3njSXxEX+G/psbkz3fsEWpSnspdx3VN0SHq0OAvGesj8LTl7Mq; Authentication-Results: sj-dkim-4; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/sjdkim4002 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: b5d20af10c334b36874c0264b10f59f1 Cc: PCN IETF list Subject: [PCN] Some clarification questions about draft-westberg-pcn-load-control X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Georgios and other authors of draft-westberg-pcn-load-control, There is some confusion that surfaced during and after the PCN WG meetings regarding the details of the algorithm operation, and which I was not able to clarify by reading the draft. Here are some of the questions that I would appreciate some clarification. 1) it is not clear how many configured rate thresholds is at the internal nodes. The draft mentions congestion-detection-threshold, severe_congestion_detection and severe_congestion_restoration. On the other hand the presentation in Chicago (I believe) mentioned only two thresholds. =20 2) Another question related the thresholds. The draft does not appear to define any explicit relationship between the two (three? See above) rate thresholds other than describing which one is greater than the other. However, if I understood Georgios correctly in the hallway conversation in Chicago, it appears that it is implicitly assumed that in fact the ratio between the two thresholds (which 2 of the three above?) is assumed to be constant for all nodes in the network. Is there indeed such an assumption, or did I misunderstand something? 3) It is not entirely clear how many code points is actually needed by the proposal. The draft mentions in different places "local-DSCP", "original-dscp", "encoded-dscp", "affected-DSCP" and "notified DSCP". Do we really need 5 states for this approach? Is it possible to clarify which one is used for what? 4)section 4.1.2 says: " the difference between the congestion notification threshold and the engineered bandwidth limitation, i.e. admission threshold, provides an interval where the signaling information on resource limitation is already sent by a node but the actual limitation is not reached". I do not understand what this means. First - does it mean that there is one more threshold ('engineered bandwidth limitation =3D admission rate' and "congestion notification threshold"? (if so, that brings various thresholds mentioned in the draft to 4, counting also severe-congestion-notification and severe-congestion-restoration???). Second, what "signal" do you mean here? Admission marking? Probe? Termination marking? Can you clarify please? Next, one par below: "To distinguish between congestion notification and severe congestion, the following method is used: The "encoded DSCP" marking for congestion notification and severe congestion. When this method is used and when the interior node is in "congestion notification" state, then the node should remark the unmarked bytes using the "encoded DSCP". =20 I am not sure I understand what the above means. What is the "method" you refer to? Do you just mean that some packets are marked with "encoded dscp" when the measurement of the total rate at the internal node exceeds the severe-congestion-? threshold (which -severe-congestion-notification or severe-congestion-restoration)?=20 5) There are two per-ingress-egress rate thresholds configured at each *egress* (pre-configured congestion notification" threshold and preconfigured severe congestion threshold). How are these egress thresholds chosen? Is there any relationship between these thresholds and the corresponding thresholds at the internal nodes? For example, is there an assumption than the sum of the (egress) severe congestion notification thresholds of all ingress-egress-pairs sharing a bottleneck link does not exceed the severe congestion notification threshold at that bottleneck link? =20 6) Section 4.1.3 says When the egress receives the probe packet, which is used as a request for reservation, it will have to perform the following functionality. When the operation state of the ingress/egress pair aggregate is the "congestion notification", see Section 4.2.3, then the implementation of the algorithm depends on how the congestion notification situation is notified to the egress. As mentioned in Section 4.1.2 this is accomplished by using the received data packets that are marked using the "encoded DSCP". In this case, during a measurement interval T, the egress measures the input_notified_bytes by counting instead of the "notified DSCP", the "encoded DSCP" bytes." What exactly is "input_totified_bytes"? This is the first time this is mentioned in the draft... Is it just the number of bytes marked with "encoded DSCP"? =20 I have many more questions on the draft, but I am hoping that perhaps the answers to the above will be helpful in understanding the rest of the draft and/or will provide useful input where clarification may be needed for the next version of the draft. It would also be helpful, if the next version of the draft either directly uses pcn terminology, or at least provide the mapping where the mapping is possible. =20 Thank you, Anna=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 01:15:00 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEIAG-000695-Dn; Fri, 27 Jul 2007 01:15:00 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEIAE-00068y-RO for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 01:14:58 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEIAD-00068o-NU for pcn@ietf.org; Fri, 27 Jul 2007 01:14:57 -0400 Received: from zcars04e.nortel.com ([47.129.242.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IEIAC-00019o-2j for pcn@ietf.org; Fri, 27 Jul 2007 01:14:56 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zcars04e.nortel.com (Switch-2.2.0/Switch-2.2.0) with ESMTP id l6R5D8X10681; Fri, 27 Jul 2007 05:13:08 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] PCN & ECN-(congestion experienced) interactions Date: Fri, 27 Jul 2007 01:14:51 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651175461B@zcarhxm1.corp.nortel.com> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA50132C141@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] PCN & ECN-(congestion experienced) interactions Thread-Index: AcfOTJNiDbXXskhTRKOfZp0Z2OHPEQBTiysXAAqlRpAABNx3KQAKhgHQ References: <5.2.1.1.2.20070724140627.03c06a58@pop3.jungle.bt.co.uk> <75A199C5D243C741BF3D3F1EBCEF9BA50132C138@E03MVZ1-UKDY.domain1.systemhost.net> <9671A92C3C8B5744BC97F855F7CB646511754474@zcarhxm1.corp.nortel.com> <75A199C5D243C741BF3D3F1EBCEF9BA50132C141@E03MVZ1-UKDY.domain1.systemhost.net> From: "Jozef Babiarz" To: , X-Spam-Score: 0.0 (/) X-Scan-Signature: 2e8fc473f5174be667965460bd5288ba Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org See below. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com]=20 Sent: July 26, 2007 7:34 PM To: Babiarz, Jozef (CAR:0S03); pcn@ietf.org Subject: RE: [PCN] PCN & ECN-(congestion experienced) interactions joe sorry i explained it badly, let me have another go. The scenario i was thinking of is this. We have a source sending data to a receiver. somewhere in the middle between the Sx & Rx is a PCN-domain. The traffic being sent is treated as PCN-traffic inside the PCN-domain ie put into the PCN Diffserv class. However, between the Sx and PCN-domain the traffic is treated in a class that can be ECN-marked. When the traffic reaches the Rx, should any ECN-marking (that happened before the PCN-domain) be preserved.=20 [Joe] Two options, 1/ if the group decides to support the flow termination method proposed in 3sm draft and assuming we agree on PCN encoding where CE=3Dflow terminate, than a CE marked packet can be interoperate as this flow needs to be terminate. The ingress lets the packet into as is and the egress open seeing flow termination (CE) market packet does the flow termination procedure.=20 2./ The PCN-ingress node open detecting CE market packet, drops the CE marked packet. Now I have a question for you, is the flow in question PCN-capable? If yes than this is a case where a PCN-capable flow hits an ECN-capable router and should be rate reduce. [joe end] One possibility is that this is a scenario that we don't need to worry about. If it is one we need to think about, then there are two possibilities for how PCN WG could think about it: [Joe] I think we need to worry about. [joe end]. (1) when such traffic reaches the PCN-domain, then tunnel it across the PCN-domain. this means that upon decapsulation at the egress any ECN-CE marking (that was there when the pkt reached the ingress) is preserved.=20 [Joe] Why do you want to preserve ECN-CE marking of packet that is PCN-capable? If the ECN-CE marked packet does not belong to PCN-capable flow, that use a different DSCP and possible a service class within the PCN-domain that also supports ECN traffic.=20 My assumption is that the diffserv domain has at least two service classes, a PCN-cable service class and others service class(es) for non-PCN traffic.=20 Tunnel would only be needed if there is only one service class and it was PCN-cable. I do not believe we are proposing this.[joe end] (2) devise an encoding scheme for PCN that preserves the ECN-CE marking. these are the two possibilities i was trying to lay out in my original email, ie (1) deal with the issue in the architecture doc by saying a tunnelling solution could be done to solve the problem=20 (2) in the encoding-comparison doc, examine what the impact of this would be on PCN-encoding (to inform the eventual choice of encoding) [Joe] The encoding-comparison draft needs to discuss possible marking interaction between ECN and PCN and propose combination(s) that best meet guidelines in RFC 4774. I think in the architecture draft we need to talk about the issue, should look at RFC 4774 and see which case apply to PCN-domain. Maybe, I'm missing something, but I do not think that we need to tunnel ECN-marked traffic across PCN-domain. [joe end] =20 phil =20 ________________________________ From: Jozef Babiarz [mailto:babiarz@nortel.com] Sent: Thu 26/07/2007 22:26 To: Eardley,PL,Philip,CXR9 R; pcn@ietf.org Subject: RE: [PCN] PCN & ECN-(congestion experienced) interactions Phil and all see below. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] Sent: July 26, 2007 4:35 PM To: pcn@ietf.org Subject: [PCN] PCN & ECN-(congestion experienced) interactions >the second issue is about what happens if traffic arrives at the PCN-domain >(for the PCN traffic class) that is already marked with ECN's CE codepoint >(congestion experienced). ie the issue is how to handle traffic which for >some reason is using ECN (end-to-end) and also using PCN admission control >(across the PCN-domain). this could be an issue for the pcn-architecture >draft, and also for the chan-pcn-encoding one. certainly it's an issue >that's got to be dealt with by at least one of these drafts. [Joe] If a packet belonging to a PCN-capable flow arrives at the PCN-domain, the ECN field should not be touched. What ever the encoding of the bits is it is forwarded that way. OK, I'm assuming that PCN can be end-to-end some day. However, if packet belonging to a flow that is not PCN-traffic arrives at the PCN-domain it gets forwarded using a different forwarding class (DSCP) than what is used for PCN traffic. The PCN-domain uses Diffserv to provide the differentiation. Only PCN traffic get's the PCN treatment. >bob says: >>>Although this is perhaps too detailed for the architecture, I suggest >that any need for ECN marking on the same path but outside the PCN [Joe] >domain(s) should be handled by tunnelling across the PCN domain, with a >non-PCN DSCP in the inner header (that turns on the RFC3168 meaning of its >ECN field) and a PCN DSCP in the outer.>> [Joe] I do not understand. I though that we state that we would use Diffserv. Why tunnel? >one possibility is to deal with this now, with the wording along the lines >that bob suggests above added to the architecture draft. basically say that >a solution on these lines would solve the problem (there may be others but >we won't think about them). [Joe] We do not need to tunnel. >another possibility is that the encoding comparison draft includes a look >at the implications of a pkt being able to be PCN-marked whilst preserving >its ECN-CE - ie the effect in terms of how the PCN-encoding is done. we >could end up deciding that it was worthwhile, orthat it wasn't worthwhile. >In the latter case we would go back to bob's solution above. [Joe] Let's do it in the architecture draft. The marking draft should be only a survey of viable marking options. >do people feel able to make a decision now to go for the first possibility >(as bob suggests - I'd be OK with this too) or do we want discussion within >the encoding-comparisons draft? [Joe] We do not need to mix ECN marking behavior and PCN marking behavior. My assumption is that we where going to use Diffserv and DS codepoints to separate traffic that is PCN-capable from traffic that is not PCN-capable. >thanks, phil _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 01:36:14 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEIUn-0001q3-Um; Fri, 27 Jul 2007 01:36:13 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEIUn-0001py-1f for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 01:36:13 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEIUl-0001po-OH for pcn@ietf.org; Fri, 27 Jul 2007 01:36:11 -0400 Received: from zcars04f.nortel.com ([47.129.242.57]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEIUl-0001EB-8d for pcn@ietf.org; Fri, 27 Jul 2007 01:36:11 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zcars04f.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6R5a8D21064; Fri, 27 Jul 2007 05:36:08 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Fri, 27 Jul 2007 01:36:07 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB64651175461F@zcarhxm1.corp.nortel.com> In-Reply-To: <75A199C5D243C741BF3D3F1EBCEF9BA50132C142@E03MVZ1-UKDY.domain1.systemhost.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: AcfOTym29onBXBPATvqVWos0hWdioABjoizDAAwWy+A= References: <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> <75A199C5D243C741BF3D3F1EBCEF9BA50132C142@E03MVZ1-UKDY.domain1.systemhost.net> From: "Jozef Babiarz" To: , X-Spam-Score: 0.0 (/) X-Scan-Signature: d185fa790257f526fedfd5d01ed9c976 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Bob, we are getting a bit beyond what is in the charter, but the correct thing to do would be to add additional capacity (additional paths) once traffic hits level where new calls would be blocked. With this approach additional revenue generating traffic could be admitted on to new paths that are not congested. Need to leave this for time being until after we complete working in current charter. But it's important that we get the basic marking behaviors right, otherwise these more advanced features will not be possible. =20 Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: philip.eardley@bt.com [mailto:philip.eardley@bt.com]=20 Sent: July 26, 2007 7:36 PM To: rbriscoe@jungle.bt.co.uk Cc: pcn@ietf.org Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt sounds good, will add bullet on these lines thanks phil ________________________________ From: Briscoe,RJ,Bob,XVR9 BRISCORJ R Sent: Wed 25/07/2007 01:03 To: Eardley,PL,Philip,CXR9 R Cc: pcn@ietf.org Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Phil & other authors, Just thought of one more possible gap: Another bullet for the Intro: o QoS reservations are decoupled from routing system (within the PCN domain). I.e. admission control lays reserved traffic over routes given by the routing system without any pinning. Then if any of capacity, routing or topology changes, the routing system just moves all traffic, so reserved flows that can gracefully continue after a short disruption will do. We don't trigger any messages from the routing system to the QoS system to say routing has changed. So we don't have to deal with losing these messages during disastrous events, or with authenticating such messages. [Of course, then, if there isn't enough capacity for the previously admitted traffic after - both a capacity, routing or topology change - and after the routing and protection system has had a chance to bring in new capacity or re-arrange the routing to fit, then flow termination can bring the system back below its max operating point.] Bob ________________________________________________________________________ ____ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 06:04:43 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEMgd-0006kc-3Q; Fri, 27 Jul 2007 06:04:43 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEMgc-0006kT-3V for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 06:04:42 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEMgb-0006kD-O8 for pcn@ietf.org; Fri, 27 Jul 2007 06:04:41 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IEMga-00083p-W5 for pcn@ietf.org; Fri, 27 Jul 2007 06:04:41 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id C8A51766; Fri, 27 Jul 2007 12:04:37 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id BB7037735; Fri, 27 Jul 2007 12:04:37 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 3B607766; Fri, 27 Jul 2007 12:04:37 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6RA4bh22357; Fri, 27 Jul 2007 12:04:37 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id D23396F591; Fri, 27 Jul 2007 11:58:44 +0200 (CEST) Message-ID: <46A9C26A.5040103@informatik.uni-wuerzburg.de> Date: Fri, 27 Jul 2007 12:01:14 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Jozef Babiarz Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt References: <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> <75A199C5D243C741BF3D3F1EBCEF9BA50132C142@E03MVZ1-UKDY.domain1.systemhost.net> <9671A92C3C8B5744BC97F855F7CB64651175461F@zcarhxm1.corp.nortel.com> In-Reply-To: <9671A92C3C8B5744BC97F855F7CB64651175461F@zcarhxm1.corp.nortel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 37af5f8fbf6f013c5b771388e24b09e7 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Joe, what Bob proposes is not an additional feature that needs to be taken care of, but rather an observed property of the current PCN architecture, that's at least my understanding. The core is stateless (= free of reservations), in case that something bad happens inside the network, routing changes and admitted traffic is carried over backup paths. If then precongestion occurs with respect to the supportable rate, flows are terminated. This is a very nice feature of PCN and should be mentioned in the introduction. Note that traffic is only terminated if the backup capacity does not suffice which can be precalculated. We did lots of such research before. Regards, Michael Jozef Babiarz wrote: > Bob, we are getting a bit beyond what is in the charter, but the correct > thing to do would be to add additional capacity (additional paths) once > traffic hits level where new calls would be blocked. With this approach > additional revenue generating traffic could be admitted on to new paths > that are not congested. Need to leave this for time being until after we > complete working in current charter. But it's important that we get the > basic marking behaviors right, otherwise these more advanced features > will not be possible. > > Regards, Joe > email:babiarz@nortel.com > Telephone:613-763-6098 > > -----Original Message----- > From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] > Sent: July 26, 2007 7:36 PM > To: rbriscoe@jungle.bt.co.uk > Cc: pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > sounds good, will add bullet on these lines > thanks > phil > > ________________________________ > > From: Briscoe,RJ,Bob,XVR9 BRISCORJ R > Sent: Wed 25/07/2007 01:03 > To: Eardley,PL,Philip,CXR9 R > Cc: pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > > Phil & other authors, > > Just thought of one more possible gap: > > Another bullet for the Intro: > > o QoS reservations are decoupled from routing system (within the PCN > domain). I.e. admission control lays reserved traffic over routes given > by > the routing system without any pinning. Then if any of capacity, routing > or > topology changes, the routing system just moves all traffic, so reserved > flows that can gracefully continue after a short disruption will do. We > don't trigger any messages from the routing system to the QoS system to > say > routing has changed. So we don't have to deal with losing these messages > during disastrous events, or with authenticating such messages. > > [Of course, then, if there isn't enough capacity for the previously > admitted traffic after > - both a capacity, routing or topology change > - and after the routing and protection system has had a chance to bring > in > new capacity or re-arrange the routing to fit, > then flow termination can bring the system back below its max operating > point.] > > > Bob > > > ________________________________________________________________________ > ____ > Bob Briscoe, Networks Research Centre, BT > Research > B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 > 645196 > > > > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 10:16:09 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEQbx-0002OH-I9; Fri, 27 Jul 2007 10:16:09 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEQbw-0002Nv-MR for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 10:16:08 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEQbw-0002Nn-Ah for pcn@ietf.org; Fri, 27 Jul 2007 10:16:08 -0400 Received: from imr2.ericy.com ([198.24.6.3]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEQbu-00055C-Jl for pcn@ietf.org; Fri, 27 Jul 2007 10:16:07 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr2.ericy.com (8.13.1/8.13.1) with ESMTP id l6REJLBJ005097 for ; Fri, 27 Jul 2007 09:19:21 -0500 Received: from eusrcmw750.eamcs.ericsson.se ([138.85.77.50]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 09:16:05 -0500 Received: from [127.0.0.1] ([147.117.168.117]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 09:16:05 -0500 From: Steven Blake To: pcn Content-Type: text/plain Organization: Ericsson IP Infrastructure Date: Fri, 27 Jul 2007 10:16:04 -0400 Message-Id: <1185545764.3508.7.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 27 Jul 2007 14:16:05.0330 (UTC) FILETIME=[AB519B20:01C7D058] X-Spam-Score: 0.0 (/) X-Scan-Signature: 856eb5f76e7a34990d1d457d8e8e5b7f Subject: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txt to working group document X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org PCN, During the Chicago PCN meeting, the authors of draft-eardley-pcn-architecture-00 asked that this draft become a working group document. Based on the discussion in the room, the PCN chairs determined that there was consensus amongst the meeting participants to move the draft to a working group document. This email is a request for comments on moving this draft to working group document. Please send your comments to the list within the next week. Scott & Steve -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 10:25:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEQkh-0000lg-8w; Fri, 27 Jul 2007 10:25:11 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEQkg-0000lX-7t for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 10:25:10 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEQkf-0000lO-Tp for pcn@ietf.org; Fri, 27 Jul 2007 10:25:09 -0400 Received: from imr2.ericy.com ([198.24.6.3]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IEQkf-0005ee-FM for pcn@ietf.org; Fri, 27 Jul 2007 10:25:09 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr2.ericy.com (8.13.1/8.13.1) with ESMTP id l6RESOHW006720 for ; Fri, 27 Jul 2007 09:28:24 -0500 Received: from eusrcmw750.eamcs.ericsson.se ([138.85.77.50]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 09:25:08 -0500 Received: from [127.0.0.1] ([147.117.168.117]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 09:25:08 -0500 From: Steven Blake To: pcn Content-Type: text/plain Organization: Ericsson IP Infrastructure Date: Fri, 27 Jul 2007 10:25:07 -0400 Message-Id: <1185546307.3508.16.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 27 Jul 2007 14:25:08.0663 (UTC) FILETIME=[EF2BA470:01C7D059] X-Spam-Score: 0.0 (/) X-Scan-Signature: ffa9dfbbe7cc58b3fa6b8ae3e57b0aa3 Subject: [PCN] Consensus call: moving draft-chan-pcn-encoding-comparison-00 to working group document X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org PCN, During the Chicago PCN meeting, the authors of draft-chan-pcn-encoding-comparison-00 asked that this draft become a working group document. Based on the discussion in the room, the PCN chairs determined that there was no consensus amongst the meeting participants to move this version of the draft to a working group document at this time. There was a comment made that if certain simplifications were made in the next version of the draft (e.g., reducing the amount of text on marking semantics and concentrating on syntax), then the draft then would be ready to move to working group document. The chairs asked the authors to consider this approach. More details of the discussion will be available when the meeting minutes are posted. This email is a request for comments on moving draft-chan-pcn-encoding-comparison-00 to working group document. Please send your comments to the list within the next week. Scott & Steve =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 10:47:19 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IER67-0002ff-45; Fri, 27 Jul 2007 10:47:19 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IER65-0002fW-80 for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 10:47:17 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IER64-0002fO-U9 for pcn@ietf.org; Fri, 27 Jul 2007 10:47:16 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IER64-0006AI-I9 for pcn@ietf.org; Fri, 27 Jul 2007 10:47:16 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6RElDa21156; Fri, 27 Jul 2007 14:47:14 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txt to working group document Date: Fri, 27 Jul 2007 10:46:57 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB646511754A38@zcarhxm1.corp.nortel.com> In-Reply-To: <1185545764.3508.7.camel@neutrino> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txt to working group document Thread-Index: AcfQWLMkl1c4QaPtRTWu+NouMKQaeQABBMaQ References: <1185545764.3508.7.camel@neutrino> From: "Jozef Babiarz" To: "Steven Blake" , "pcn" X-Spam-Score: 0.0 (/) X-Scan-Signature: 39bd8f8cbb76cae18b7e23f7cf6b2b9f Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org I support making this draft a working group document.=20 Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Steven Blake [mailto:steven.blake@ericsson.com]=20 Sent: July 27, 2007 10:16 AM To: pcn Subject: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txt to working group document PCN, During the Chicago PCN meeting, the authors of draft-eardley-pcn-architecture-00 asked that this draft become a working group document. Based on the discussion in the room, the PCN chairs determined that there was consensus amongst the meeting participants to move the draft to a working group document. This email is a request for comments on moving this draft to working group document. Please send your comments to the list within the next week. Scott & Steve --=20 =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 Steven Blake Ericsson/Redback Networks +1 919-472-9913 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 10:56:08 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEREd-0002EH-Vs; Fri, 27 Jul 2007 10:56:07 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEREc-0002EC-AQ for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 10:56:06 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEREc-0002E3-0n for pcn@ietf.org; Fri, 27 Jul 2007 10:56:06 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEREb-00066q-As for pcn@ietf.org; Fri, 27 Jul 2007 10:56:06 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id l6REu2a23012; Fri, 27 Jul 2007 14:56:02 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Date: Fri, 27 Jul 2007 10:56:00 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB646511754A6D@zcarhxm1.corp.nortel.com> In-Reply-To: <46A9C26A.5040103@informatik.uni-wuerzburg.de> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Thread-Index: AcfQNY6vAbppUlJRRLqF72FExPIryQAKJzQQ References: <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> <75A199C5D243C741BF3D3F1EBCEF9BA50132C142@E03MVZ1-UKDY.domain1.systemhost.net> <9671A92C3C8B5744BC97F855F7CB64651175461F@zcarhxm1.corp.nortel.com> <46A9C26A.5040103@informatik.uni-wuerzburg.de> From: "Jozef Babiarz" To: X-Spam-Score: 0.0 (/) X-Scan-Signature: 29dc808194f5fb921c09d0040806d6eb Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Thanks Michael for the explanation. Regards, Joe email:babiarz@nortel.com Telephone:613-763-6098 -----Original Message----- From: Michael Menth [mailto:menth@informatik.uni-wuerzburg.de]=20 Sent: July 27, 2007 6:01 AM To: Babiarz, Jozef (CAR:0S03) Cc: philip.eardley@bt.com; rbriscoe@jungle.bt.co.uk; pcn@ietf.org Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt Hi Joe, what Bob proposes is not an additional feature that needs to be taken=20 care of, but rather an observed property of the current PCN=20 architecture, that's at least my understanding. The core is stateless = (=3D free of reservations), in case that something bad happens inside the=20 network, routing changes and admitted traffic is carried over backup=20 paths. If then precongestion occurs with respect to the supportable=20 rate, flows are terminated. This is a very nice feature of PCN and=20 should be mentioned in the introduction. Note that traffic is only=20 terminated if the backup capacity does not suffice which can be=20 precalculated. We did lots of such research before. Regards, Michael Jozef Babiarz wrote: > Bob, we are getting a bit beyond what is in the charter, but the correct > thing to do would be to add additional capacity (additional paths) once > traffic hits level where new calls would be blocked. With this approach > additional revenue generating traffic could be admitted on to new paths > that are not congested. Need to leave this for time being until after we > complete working in current charter. But it's important that we get the > basic marking behaviors right, otherwise these more advanced features > will not be possible. > =20 > Regards, Joe > email:babiarz@nortel.com > Telephone:613-763-6098 > > -----Original Message----- > From: philip.eardley@bt.com [mailto:philip.eardley@bt.com]=20 > Sent: July 26, 2007 7:36 PM > To: rbriscoe@jungle.bt.co.uk > Cc: pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > sounds good, will add bullet on these lines > thanks > phil > > ________________________________ > > From: Briscoe,RJ,Bob,XVR9 BRISCORJ R > Sent: Wed 25/07/2007 01:03 > To: Eardley,PL,Philip,CXR9 R > Cc: pcn@ietf.org > Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > > Phil & other authors, > > Just thought of one more possible gap: > > Another bullet for the Intro: > > o QoS reservations are decoupled from routing system (within the PCN > domain). I.e. admission control lays reserved traffic over routes given > by > the routing system without any pinning. Then if any of capacity, routing > or > topology changes, the routing system just moves all traffic, so reserved > flows that can gracefully continue after a short disruption will do. We > don't trigger any messages from the routing system to the QoS system to > say > routing has changed. So we don't have to deal with losing these messages > during disastrous events, or with authenticating such messages. > > [Of course, then, if there isn't enough capacity for the previously > admitted traffic after > - both a capacity, routing or topology change > - and after the routing and protection system has had a chance to bring > in > new capacity or re-arrange the routing to fit, > then flow termination can bring the system back below its max operating > point.] > > > Bob > > > ________________________________________________________________________ > ____ > Bob Briscoe, Networks Research Centre, BT > Research > B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 > 645196=20 > > > > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > =20 --=20 Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 11:41:19 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IERwN-0000WS-Lx; Fri, 27 Jul 2007 11:41:19 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IERwM-0000WN-PY for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 11:41:18 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IERwM-0000WF-G7 for pcn@ietf.org; Fri, 27 Jul 2007 11:41:18 -0400 Received: from rtp-iport-1.cisco.com ([64.102.122.148]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IERwM-0007BF-4D for pcn@ietf.org; Fri, 27 Jul 2007 11:41:18 -0400 Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-1.cisco.com with ESMTP; 27 Jul 2007 11:41:18 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAHKuqUZAZnme/2dsb2JhbAA X-IronPort-AV: i="4.16,589,1175486400"; d="scan'208"; a="66346173:sNHT28457160" Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id l6RFfHH5013968; Fri, 27 Jul 2007 11:41:17 -0400 Received: from xbh-rtp-201.amer.cisco.com (xbh-rtp-201.cisco.com [64.102.31.12]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6RFfHWI002837; Fri, 27 Jul 2007 15:41:17 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 11:41:17 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txtto working group document Date: Fri, 27 Jul 2007 11:41:16 -0400 Message-ID: In-Reply-To: <1185545764.3508.7.camel@neutrino> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txtto working group document Thread-Index: AcfQWLFO5ISbOybKQX+QzdBg2Hgm1QAC9cvg From: "Anna Charny \(acharny\)" To: "Steven Blake" , "pcn" X-OriginalArrivalTime: 27 Jul 2007 15:41:17.0590 (UTC) FILETIME=[92769360:01C7D064] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=1230; t=1185550877; x=1186414877; c=relaxed/simple; s=rtpdkim1001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20RE=3A=20[PCN]=20Consensus=20call=3A=20moving=20draft-eardley- pcn-architecture-00.txtto=20working=20group=20document |Sender:=20 |To:=20=22Steven=20Blake=22=20, =20=22pcn=22=20 ; bh=03tvh9WXGktdEmIm2YSAgL/WKwMtIpYvqAgJSIdLxbI=; b=cLzx6rYyEhrvgf3d+jWUSiriYFrIIPvhShtSvkkTax2CQDoZJDE0MnsC4HjfJZxiOpk4wurL H/fbMwukPITfrKG4XdlVvNfyOg9iY/b5FPzBmQNoKfY/H1YdapvY8ufz; Authentication-Results: rtp-dkim-1; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim1001 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: 69a74e02bbee44ab4f8eafdbcedd94a1 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org I support this. Anna =20 > -----Original Message----- > From: Steven Blake [mailto:steven.blake@ericsson.com]=20 > Sent: Friday, July 27, 2007 10:16 AM > To: pcn > Subject: [PCN] Consensus call: moving=20 > draft-eardley-pcn-architecture-00.txtto working group document >=20 > PCN, >=20 > During the Chicago PCN meeting, the authors of=20 > draft-eardley-pcn-architecture-00 asked that this draft=20 > become a working group document. Based on the discussion in=20 > the room, the PCN chairs determined that there was consensus=20 > amongst the meeting participants to move the draft to a=20 > working group document. >=20 > This email is a request for comments on moving this draft to=20 > working group document. Please send your comments to the=20 > list within the next week. >=20 > Scott & Steve > -- > = =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 > Steven Blake > Ericsson/Redback Networks +1 919-472-9913 >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn >=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 11:51:26 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IES6A-0002uP-Fr; Fri, 27 Jul 2007 11:51:26 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IES69-0002uI-Ep for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 11:51:25 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IES69-0002uA-47 for pcn@ietf.org; Fri, 27 Jul 2007 11:51:25 -0400 Received: from sj-iport-3-in.cisco.com ([171.71.176.72] helo=sj-iport-3.cisco.com) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IES68-0007i3-O4 for pcn@ietf.org; Fri, 27 Jul 2007 11:51:25 -0400 Received: from sj-dkim-4.cisco.com ([171.71.179.196]) by sj-iport-3.cisco.com with ESMTP; 27 Jul 2007 08:51:24 -0700 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAH+xqUarR7PE/2dsb2JhbAA X-IronPort-AV: i="4.16,589,1175497200"; d="scan'208"; a="507769875:sNHT55674292" Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-4.cisco.com (8.12.11/8.12.11) with ESMTP id l6RFpN2M005869; Fri, 27 Jul 2007 08:51:23 -0700 Received: from xbh-sjc-221.amer.cisco.com (xbh-sjc-221.cisco.com [128.107.191.63]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id l6RFpJ6O005952; Fri, 27 Jul 2007 15:51:23 GMT Received: from xfe-sjc-211.amer.cisco.com ([171.70.151.174]) by xbh-sjc-221.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 08:51:18 -0700 Received: from [10.32.241.76] ([10.32.241.76]) by xfe-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 08:51:18 -0700 In-Reply-To: <1185545764.3508.7.camel@neutrino> References: <1185545764.3508.7.camel@neutrino> Mime-Version: 1.0 (Apple Message framework v752.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <2F4DCACC-C304-496B-924F-EAE3F527241C@cisco.com> Content-Transfer-Encoding: 7bit From: Bruce Davie Subject: Re: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txt to working group document Date: Fri, 27 Jul 2007 11:51:14 -0400 To: Steven Blake X-Mailer: Apple Mail (2.752.3) X-OriginalArrivalTime: 27 Jul 2007 15:51:18.0642 (UTC) FILETIME=[F8B7D520:01C7D065] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=924; t=1185551483; x=1186415483; c=relaxed/simple; s=sjdkim4002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=bdavie@cisco.com; z=From:=20Bruce=20Davie=20 |Subject:=20Re=3A=20[PCN]=20Consensus=20call=3A=20moving=20draft-eardley- pcn-architecture-00.txt=20to=20working=20group=20document |Sender:=20; bh=dmKt0Ac+tInYAFHggGrHrzM/FcTPhPISA8vLNu/sCjc=; b=rq+2a44Hx0xVNyN7j9yBF+pH63yXOR6DekTYgJ9lPOGb2r3FQkYVOLqrkkgdkxF4k2w9HuQ0 0hoy/ZD97b0DKmRlHe/u8PoAu0Uz8c1ZJFIunyhdvbov9+GyjDLhdVmh; Authentication-Results: sj-dkim-4; header.From=bdavie@cisco.com; dkim=pass ( sig from cisco.com/sjdkim4002 verified; ); X-Spam-Score: 0.0 (/) X-Scan-Signature: e5ba305d0e64821bf3d8bc5d3bb07228 Cc: pcn X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org In favor. Bruce Davie On Jul 27, 2007, at 10:16 AM, Steven Blake wrote: > PCN, > > During the Chicago PCN meeting, the authors of > draft-eardley-pcn-architecture-00 asked that this draft become a > working > group document. Based on the discussion in the room, the PCN chairs > determined that there was consensus amongst the meeting > participants to > move the draft to a working group document. > > This email is a request for comments on moving this draft to working > group document. Please send your comments to the list within the next > week. > > Scott & Steve > -- > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > Steven Blake > Ericsson/Redback Networks +1 919-472-9913 > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 12:47:02 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IESxy-0004bT-Nu; Fri, 27 Jul 2007 12:47:02 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IESxx-0004bJ-U1 for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 12:47:01 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IESxx-0004bA-JE for pcn@ietf.org; Fri, 27 Jul 2007 12:47:01 -0400 Received: from rtp-iport-1.cisco.com ([64.102.122.148]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IESxx-0000of-5t for pcn@ietf.org; Fri, 27 Jul 2007 12:47:01 -0400 Received: from rtp-dkim-2.cisco.com ([64.102.121.159]) by rtp-iport-1.cisco.com with ESMTP; 27 Jul 2007 12:47:00 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAOW9qUZAZnmf/2dsb2JhbAA X-IronPort-AV: i="4.16,589,1175486400"; d="scan'208"; a="66353529:sNHT146321196" Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id l6RGl0Rk001945; Fri, 27 Jul 2007 12:47:00 -0400 Received: from xbh-rtp-201.amer.cisco.com (xbh-rtp-201.cisco.com [64.102.31.12]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6RGkSWs027222; Fri, 27 Jul 2007 16:47:00 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 12:46:37 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] Consensus call: moving draft-chan-pcn-encoding-comparison-00to working group document Date: Fri, 27 Jul 2007 12:46:36 -0400 Message-ID: In-Reply-To: <1185546307.3508.16.camel@neutrino> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] Consensus call: moving draft-chan-pcn-encoding-comparison-00to working group document Thread-Index: AcfQWfZaigcwSbsnSxmHhz/yakCkbAAE1dUA From: "Anna Charny \(acharny\)" To: "Steven Blake" , "pcn" X-OriginalArrivalTime: 27 Jul 2007 16:46:37.0514 (UTC) FILETIME=[B2EB82A0:01C7D06D] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=1979; t=1185554820; x=1186418820; c=relaxed/simple; s=rtpdkim2001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20RE=3A=20[PCN]=20Consensus=20call=3A=20moving=20draft-chan-pcn -encoding-comparison-00to=20working=20group=20document |Sender:=20 |To:=20=22Steven=20Blake=22=20, =20=22pcn=22=20 ; bh=W+y7Ph4F2vEE3cfGh+O0UvFhkloH8FrFh68R+uogpFY=; b=UFIpi/5SULnYZ75Xuusb5YCVozqfMv2Dcx/+cbyiYXG5sUcFjEtuh5TecsreWEjU7V+DtP2V R5h64AFVAST1/JIJWofY+B1FM0A+W4geadGCNqk3i6cLs0KJAgCZ4bJs; Authentication-Results: rtp-dkim-2; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim2001 verified; ); X-Spam-Score: 0.0 (/) X-Scan-Signature: 538aad3a3c4f01d8b6a6477ca4248793 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi, It is my understanding that the authors are committed to make changes and simplifications and resend the draft to the list. In my opinion it is worth waiting till the new version comes out before making it a working group document. Thanks, Anna=20 > -----Original Message----- > From: Steven Blake [mailto:steven.blake@ericsson.com]=20 > Sent: Friday, July 27, 2007 10:25 AM > To: pcn > Subject: [PCN] Consensus call: moving=20 > draft-chan-pcn-encoding-comparison-00to working group document >=20 > PCN, >=20 > During the Chicago PCN meeting, the authors of=20 > draft-chan-pcn-encoding-comparison-00 asked that this draft=20 > become a working group document. Based on the discussion in=20 > the room, the PCN chairs determined that there was no=20 > consensus amongst the meeting participants to move this=20 > version of the draft to a working group document at this=20 > time. There was a comment made that if certain=20 > simplifications were made in the next version of the draft=20 > (e.g., reducing the amount of text on marking semantics and=20 > concentrating on syntax), then the draft then would be ready=20 > to move to working group document. The chairs asked the=20 > authors to consider this approach. More details of the=20 > discussion will be available when the meeting minutes are posted. >=20 > This email is a request for comments on moving=20 > draft-chan-pcn-encoding-comparison-00 to working group=20 > document. Please send your comments to the list within the next week. >=20 >=20 > Scott & Steve >=20 > = =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 > Steven Blake > Ericsson/Redback Networks +1 919-472-9913 >=20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn >=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 13:05:25 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IETFl-0001OP-3I; Fri, 27 Jul 2007 13:05:25 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IETFj-0001OJ-LK for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 13:05:23 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IETFj-0001OA-AI for pcn@ietf.org; Fri, 27 Jul 2007 13:05:23 -0400 Received: from sj-iport-6.cisco.com ([171.71.176.117]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IETFi-0000th-1v for pcn@ietf.org; Fri, 27 Jul 2007 13:05:23 -0400 Received: from sj-dkim-2.cisco.com ([171.71.179.186]) by sj-iport-6.cisco.com with ESMTP; 27 Jul 2007 10:05:21 -0700 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CABLDqUarR7O6/2dsb2JhbAA X-IronPort-AV: i="4.16,589,1175497200"; d="scan'208"; a="189829029:sNHT498577842" Received: from sj-core-1.cisco.com (sj-core-1.cisco.com [171.71.177.237]) by sj-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id l6RH5LRQ014273; Fri, 27 Jul 2007 10:05:21 -0700 Received: from xbh-sjc-221.amer.cisco.com (xbh-sjc-221.cisco.com [128.107.191.63]) by sj-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6RH5CA4008546; Fri, 27 Jul 2007 17:05:21 GMT Received: from xfe-sjc-211.amer.cisco.com ([171.70.151.174]) by xbh-sjc-221.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 10:05:14 -0700 Received: from [10.32.241.76] ([10.32.241.76]) by xfe-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 10:05:13 -0700 In-Reply-To: <1185546307.3508.16.camel@neutrino> References: <1185546307.3508.16.camel@neutrino> Mime-Version: 1.0 (Apple Message framework v752.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <2CCC0BFE-6DDF-4027-836E-0816484667DB@cisco.com> Content-Transfer-Encoding: 7bit From: Bruce Davie Subject: Re: [PCN] Consensus call: moving draft-chan-pcn-encoding-comparison-00 to working group document Date: Fri, 27 Jul 2007 13:05:10 -0400 To: Steven Blake X-Mailer: Apple Mail (2.752.3) X-OriginalArrivalTime: 27 Jul 2007 17:05:13.0705 (UTC) FILETIME=[4C38BD90:01C7D070] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=2990; t=1185555921; x=1186419921; c=relaxed/simple; s=sjdkim2002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=bdavie@cisco.com; z=From:=20Bruce=20Davie=20 |Subject:=20Re=3A=20[PCN]=20Consensus=20call=3A=20moving=20draft-chan-pcn -encoding-comparison-00=20to=20working=20group=20document |Sender:=20; bh=sthkxGO6ld1aU+0wjUv6x6K/JnZvC27NiU0uufLJ6Ng=; b=WBY1c3YI7Svmgk6OeJVzXBqN5gTt+XgDrNMuZ1WgelitFuklUzSe8n+pp+60R6ZwWs1B8SPO AzzBFm9nCv3TBIIbhCFobjjm/gMQ/TjEvhAuOgpBaeNA4PpFfHUhcEQ3; Authentication-Results: sj-dkim-2; header.From=bdavie@cisco.com; dkim=pass ( sig from cisco.com/sjdkim2002 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: fb6060cb60c0cea16e3f7219e40a0a81 Cc: pcn X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org I think the draft needs so much revision at this point that I would rather wait for the next version before deciding if it is ready to be a WG document. Specifically, the draft needs to avoid replicating so much material from other sources. Almost everything in sections 1 and 2 should be removed. The place to define or discuss PCN motivation, terminology, architecture, etc., is in other drafts (such as the architecture draft). This draft should only reference other drafts. If the authors think they need some new terminology, I would urge them to get the architecture team to include it in their draft. This draft should consist of statements like "The approach to PCN described in [Reference] requires N distinct packet markings (codepoints). These codepoints could be encoded in the following ways: - encoding A - encoding B etc. And then discuss the tradeoffs among the different encoding approaches. The authors should be careful to distinguish between the state of a *node* and a marking of a *packet* (e.g. a node might be in a severely congested state, in which case it wants to be terminating some flows, leading to some marking of packets with a "terminate" marking. But note that a node will often generate several different markings while in a given state, hence states and markings are not equivalent.) I think the attempt to make this distinction was what led to the notion of "features" which most people (including me) seemed to find confusing. This looks like a pretty major rewrite to me. Bruce On Jul 27, 2007, at 10:25 AM, Steven Blake wrote: > PCN, > > During the Chicago PCN meeting, the authors of > draft-chan-pcn-encoding-comparison-00 asked that this draft become a > working group document. Based on the discussion in the room, the PCN > chairs determined that there was no consensus amongst the meeting > participants to move this version of the draft to a working group > document at this time. There was a comment made that if certain > simplifications were made in the next version of the draft (e.g., > reducing the amount of text on marking semantics and concentrating on > syntax), then the draft then would be ready to move to working group > document. The chairs asked the authors to consider this approach. > More > details of the discussion will be available when the meeting > minutes are > posted. > > This email is a request for comments on moving > draft-chan-pcn-encoding-comparison-00 to working group document. > Please > send your comments to the list within the next week. > > > Scott & Steve > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > Steven Blake > Ericsson/Redback Networks +1 919-472-9913 > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 13:36:13 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IETjY-0003W8-PH; Fri, 27 Jul 2007 13:36:12 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IETjX-0003Qf-KZ for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 13:36:11 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IETjX-0003Q4-9e for pcn@ietf.org; Fri, 27 Jul 2007 13:36:11 -0400 Received: from smtp2.smtp.bt.com ([217.32.164.150]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IETjW-00020s-Ng for pcn@ietf.org; Fri, 27 Jul 2007 13:36:11 -0400 Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 18:36:09 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Fri, 27 Jul 2007 18:36:09 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185557768143; Fri, 27 Jul 2007 18:36:08 +0100 Received: from mut.jungle.bt.co.uk ([10.86.1.135]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6RHa3Hf027779; Fri, 27 Jul 2007 18:36:07 +0100 Message-Id: <5.2.1.1.2.20070727183341.02ae60c8@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Fri, 27 Jul 2007 18:36:18 +0100 To: "Jozef Babiarz" From: Bob Briscoe Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt In-Reply-To: <9671A92C3C8B5744BC97F855F7CB64651175461F@zcarhxm1.corp.nor tel.com> References: <75A199C5D243C741BF3D3F1EBCEF9BA50132C142@E03MVZ1-UKDY.domain1.systemhost.net> <5.2.1.1.2.20070725004644.046ce0a0@pop3.jungle.bt.co.uk> <75A199C5D243C741BF3D3F1EBCEF9BA50132C142@E03MVZ1-UKDY.domain1.systemhost.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 27 Jul 2007 17:36:09.0233 (UTC) FILETIME=[9E33D810:01C7D074] X-Spam-Score: 0.0 (/) X-Scan-Signature: 6e922792024732fb1bb6f346e63517e4 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Joe, We could say that the routing system could optionally be driven by the QoS system. Of course, my suggestion below was a statement saying a strength of PCN is that we don't _have to_ have that dependency. Bob At 06:36 27/07/2007, Jozef Babiarz wrote: >Bob, we are getting a bit beyond what is in the charter, but the correct >thing to do would be to add additional capacity (additional paths) once >traffic hits level where new calls would be blocked. With this approach >additional revenue generating traffic could be admitted on to new paths >that are not congested. Need to leave this for time being until after we >complete working in current charter. But it's important that we get the >basic marking behaviors right, otherwise these more advanced features >will not be possible. > >Regards, Joe >email:babiarz@nortel.com >Telephone:613-763-6098 > >-----Original Message----- >From: philip.eardley@bt.com [mailto:philip.eardley@bt.com] >Sent: July 26, 2007 7:36 PM >To: rbriscoe@jungle.bt.co.uk >Cc: pcn@ietf.org >Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > >sounds good, will add bullet on these lines >thanks >phil > >________________________________ > >From: Briscoe,RJ,Bob,XVR9 BRISCORJ R >Sent: Wed 25/07/2007 01:03 >To: Eardley,PL,Philip,CXR9 R >Cc: pcn@ietf.org >Subject: RE: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt > > > >Phil & other authors, > >Just thought of one more possible gap: > >Another bullet for the Intro: > > o QoS reservations are decoupled from routing system (within the PCN >domain). I.e. admission control lays reserved traffic over routes given >by >the routing system without any pinning. Then if any of capacity, routing >or >topology changes, the routing system just moves all traffic, so reserved >flows that can gracefully continue after a short disruption will do. We >don't trigger any messages from the routing system to the QoS system to >say >routing has changed. So we don't have to deal with losing these messages >during disastrous events, or with authenticating such messages. > >[Of course, then, if there isn't enough capacity for the previously >admitted traffic after >- both a capacity, routing or topology change >- and after the routing and protection system has had a chance to bring >in >new capacity or re-arrange the routing to fit, >then flow termination can bring the system back below its max operating >point.] > > >Bob > > >________________________________________________________________________ >____ >Bob Briscoe, Networks Research Centre, BT >Research >B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 >645196 > > > > > > >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www1.ietf.org/mailman/listinfo/pcn ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 15:05:45 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEV8C-0005my-RN; Fri, 27 Jul 2007 15:05:44 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEV8B-0005ms-Ki for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 15:05:43 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEV8B-0005mk-BA for pcn@ietf.org; Fri, 27 Jul 2007 15:05:43 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEV89-0004JE-FV for pcn@ietf.org; Fri, 27 Jul 2007 15:05:42 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id 5F12B70C8; Fri, 27 Jul 2007 21:05:38 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id 517937FD6; Fri, 27 Jul 2007 21:05:38 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id EC05A70C8; Fri, 27 Jul 2007 21:05:37 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6RJ5bh25330; Fri, 27 Jul 2007 21:05:37 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id A2CA06F591; Fri, 27 Jul 2007 20:59:44 +0200 (CEST) Message-ID: <46AA4138.2020405@informatik.uni-wuerzburg.de> Date: Fri, 27 Jul 2007 21:02:16 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Steven Blake Subject: Re: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txt to working group document References: <1185545764.3508.7.camel@neutrino> <9671A92C3C8B5744BC97F855F7CB646511754A38@zcarhxm1.corp.nortel.com> In-Reply-To: <9671A92C3C8B5744BC97F855F7CB646511754A38@zcarhxm1.corp.nortel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 7baded97d9887f7a0c7e8a33c2e3ea1b Cc: pcn X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org I support, too. Michael Jozef Babiarz wrote: > I support making this draft a working group document. > > Regards, Joe > email:babiarz@nortel.com > Telephone:613-763-6098 > -----Original Message----- > From: Steven Blake [mailto:steven.blake@ericsson.com] > Sent: July 27, 2007 10:16 AM > To: pcn > Subject: [PCN] Consensus call: moving > draft-eardley-pcn-architecture-00.txt to working group document > > PCN, > > During the Chicago PCN meeting, the authors of > draft-eardley-pcn-architecture-00 asked that this draft become a working > group document. Based on the discussion in the room, the PCN chairs > determined that there was consensus amongst the meeting participants to > move the draft to a working group document. > > This email is a request for comments on moving this draft to working > group document. Please send your comments to the list within the next > week. > > Scott & Steve > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 15:06:22 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEV8o-0007Bc-FG; Fri, 27 Jul 2007 15:06:22 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEV8n-0007BS-My for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 15:06:21 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEV8n-0007BK-CJ for pcn@ietf.org; Fri, 27 Jul 2007 15:06:21 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IEV8m-0004dV-OS for pcn@ietf.org; Fri, 27 Jul 2007 15:06:21 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id D57F37FD6; Fri, 27 Jul 2007 21:06:19 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id C7A907FED; Fri, 27 Jul 2007 21:06:19 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id A920A7FD6; Fri, 27 Jul 2007 21:06:19 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6RJ6Jh25346; Fri, 27 Jul 2007 21:06:19 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 3A53F6F591; Fri, 27 Jul 2007 21:00:26 +0200 (CEST) Message-ID: <46AA4161.7030005@informatik.uni-wuerzburg.de> Date: Fri, 27 Jul 2007 21:02:57 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: Steven Blake Subject: Re: [PCN] Consensus call: moving draft-chan-pcn-encoding-comparison-00to working group document References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 25620135586de10c627e3628c432b04a Cc: pcn X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org I agree with Anna. Michael Anna Charny (acharny) wrote: > Hi, > > It is my understanding that the authors are committed to make changes > and simplifications and resend the draft to the list. In my opinion it > is worth waiting till the new version comes out before making it a > working group document. > > Thanks, > Anna > > >> -----Original Message----- >> From: Steven Blake [mailto:steven.blake@ericsson.com] >> Sent: Friday, July 27, 2007 10:25 AM >> To: pcn >> Subject: [PCN] Consensus call: moving >> draft-chan-pcn-encoding-comparison-00to working group document >> >> PCN, >> >> During the Chicago PCN meeting, the authors of >> draft-chan-pcn-encoding-comparison-00 asked that this draft >> become a working group document. Based on the discussion in >> the room, the PCN chairs determined that there was no >> consensus amongst the meeting participants to move this >> version of the draft to a working group document at this >> time. There was a comment made that if certain >> simplifications were made in the next version of the draft >> (e.g., reducing the amount of text on marking semantics and >> concentrating on syntax), then the draft then would be ready >> to move to working group document. The chairs asked the >> authors to consider this approach. More details of the >> discussion will be available when the meeting minutes are posted. >> >> This email is a request for comments on moving >> draft-chan-pcn-encoding-comparison-00 to working group >> document. Please send your comments to the list within the next week. >> >> >> Scott & Steve >> >> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >> Steven Blake >> Ericsson/Redback Networks +1 919-472-9913 >> >> >> >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >> >> > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 15:54:01 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEVst-0008El-K2; Fri, 27 Jul 2007 15:53:59 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEVsr-0008Ef-I0 for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 15:53:57 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEVsr-0008EX-55 for pcn@ietf.org; Fri, 27 Jul 2007 15:53:57 -0400 Received: from wrzx28.rz.uni-wuerzburg.de ([132.187.3.28] helo=mailrelay.rz.uni-wuerzburg.de) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IEVsq-0005Ru-EP for pcn@ietf.org; Fri, 27 Jul 2007 15:53:57 -0400 Received: from virusscan.mail (localhost [127.0.0.1]) by mailrelay.mail (Postfix) with ESMTP id BDB6574FB; Fri, 27 Jul 2007 21:53:53 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by virusscan.mail (Postfix) with ESMTP id AF4FC7901; Fri, 27 Jul 2007 21:53:53 +0200 (CEST) Received: from europa.informatik.uni-wuerzburg.de (wicx01.informatik.uni-wuerzburg.de [132.187.11.1]) by mailmaster.uni-wuerzburg.de (Postfix) with ESMTP id 9193D74FB; Fri, 27 Jul 2007 21:53:53 +0200 (CEST) Received: from nero.informatik.uni-wuerzburg.de (win3005.informatik.uni-wuerzburg.de [132.187.106.5]) by europa.informatik.uni-wuerzburg.de (8.11.3/8.11.2/SuSE Linux 8.11.1-0.5) with ESMTP id l6RJrrh25581; Fri, 27 Jul 2007 21:53:53 +0200 Received: from [127.0.0.1] (nero.informatik.uni-wuerzburg.de [132.187.106.5]) by nero.informatik.uni-wuerzburg.de (Postfix) with ESMTP id 00E8A6F591; Fri, 27 Jul 2007 21:47:59 +0200 (CEST) Message-ID: <46AA4C87.9080408@informatik.uni-wuerzburg.de> Date: Fri, 27 Jul 2007 21:50:31 +0200 From: Michael Menth Organization: University of Wuerzburg User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: "Anna Charny (acharny)" References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-wuerzburg.de X-Spam-Score: 0.0 (/) X-Scan-Signature: 5011df3e2a27abcc044eaa15befcaa87 Cc: PCN IETF list Subject: [PCN] Specific performance criteria suggestions X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: menth@informatik.uni-wuerzburg.de List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Anna, these performance issues spontaneously came to my mind for performance evaluation of different PCN mechanisms. 1. How easy are the mechanisms to implement in core and at the edge? 2. How fast do meters and markers in the core react on increased traffic rate? 3. How fast do edge systems detect "pre-congestion with regard to supportable rate" when number of marked packets increases? 4. How fast can "pre-congestion with regard to supportable rate" be reduced? That includes metering/marking delay in the core and measurement delay at the edge, signaling, and time to choose appropriate flows. 5. How accurate do measurements need to be? 6. Question 5 has a direct impact on how long measurement intervals need to be which impacts the answers to the other questions. 7. How can ECMP be supported? How easy is this? 8. How can probing be supported? How easy is this? 9. How large is over/underutilization? 10. How fast can admission control react to flash crowds? 11. How easy can the system be extended towards multiple prioritized PCN- and non-PCN classes? 12. How easy can preemption priorities be integrated? 13. How easy can the mechanisms be configured? How many parameters? 14. Are the parameters flexible enough to get optimum performance (whatever the goals are). Example: http://www3.informatik.uni-wuerzburg.de/staff/menth/Publications/Menth07-PCN-Config.pdf 15. How many bits are required for packet marking? 16. Do mechanisms provide stable signals for admission-stop/admission-continue or are they flapping when operating near the admissible rate border? 17. Are there differences among the proposals with regard to flow fairness? Probably more to come ... Regards, Michael Anna Charny (acharny) wrote: > Hi all, > > Following the discussion in the PCN WG meeting yesterday and as a result > of follow-up hallway discussions, the authors of various proposals seem > to have come up with a common language to describe all the different PCN > proposals and a preliminary view on their relative cons and pros. I > have volunteered to produce a consolidated draft which will attempt to > discuss all current proposals in the same framework and take the first > cut on comparison criteria and how it is met by different approaches. > > We already have a number of comparison criteria loosely used in > discussions. I am requesting feedback from the list with suggestions > for specific performance criteria suggestions. Those who have already > sent those to me privately may wish to resend them to the list. > > I am also requesting that the authors of each proposed mechanism send > their view of the cons and pros they see of their specific approach > (functional, deployment, performance, etc). Of course similar feedback > is also welcome from the entire list. > > Thank you, > Anna > > > > > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn > -- Dr. Michael Menth, Assistant Professor University of Wuerzburg, Institute of Computer Science Am Hubland, D-97074 Wuerzburg, Germany, room B206 phone: (+49)-931/888-6644, fax: (+49)-931/888-6632 mailto:menth@informatik.uni-wuerzburg.de http://www3.informatik.uni-wuerzburg.de/research/ngn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Fri Jul 27 18:43:24 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEYWq-0005VB-8o; Fri, 27 Jul 2007 18:43:24 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEYWp-0005V4-4x for pcn-confirm+ok@megatron.ietf.org; Fri, 27 Jul 2007 18:43:23 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEYWo-0005Uw-Rb for pcn@ietf.org; Fri, 27 Jul 2007 18:43:22 -0400 Received: from zcars04e.nortel.com ([47.129.242.56]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IEYWn-0001XG-HP for pcn@ietf.org; Fri, 27 Jul 2007 18:43:22 -0400 Received: from zcarhxm1.corp.nortel.com (zcarhxm1.corp.nortel.com [47.129.230.97]) by zcars04e.nortel.com (Switch-2.2.0/Switch-2.2.0) with ESMTP id l6RMfX817577; Fri, 27 Jul 2007 22:41:33 GMT X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Subject: RE: [PCN] addressing Date: Fri, 27 Jul 2007 18:43:18 -0400 Message-ID: <9671A92C3C8B5744BC97F855F7CB6465117A7467@zcarhxm1.corp.nortel.com> In-Reply-To: <017a01c7cecc$a8c43670$4fa81cac@jys3105121962> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] addressing Thread-Index: AcfOzLViveEHgtX0QY+RycJzOhm23gBtjgjg References: <017a01c7cecc$a8c43670$4fa81cac@jys3105121962> From: "Jozef Babiarz" To: "Tina TSOU" , X-Spam-Score: 0.0 (/) X-Scan-Signature: bd8a74b81c71f965ca7918b90d1c49c0 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0856854287==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============0856854287== Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7D09F.86C735C9" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7D09F.86C735C9 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Tina, I think the issue is that the egress node needs to know the address and port number of the ingress node that physically admitted the flow into the PCN-domain. The egress node needs to send pre-congestion and congestion information that is associated with the flow or flow aggregate back to the ingress node directly or possible through a centralized entity. The ingress node needs to enforce the stop admission or flow termination decision. =20 The issue of where admission or flow termination decision is made is a separate topic of discussion. We should have a discussion on the benefits of where the decision should be made, on ingress, egress, some centralizes point or hybrid e.g., flow admission is done in ingress and flow termination at egress, but in all cases enforcement of the decision in at the ingress node. Regards, Joe=20 email:babiarz@nortel.com=20 Telephone:613-763-6098=20 ________________________________ From: Tina TSOU [mailto:tena@huawei.com]=20 Sent: July 25, 2007 11:01 AM To: pcn@ietf.org Subject: [PCN] addressing =20 Hi all, What I was going to comment on "eardley-pcn-architecture-00" presentation just after the line cut is below. How about refine slide page 7 "PCN-egress-node needs to know address of PCN-ingress-node (or 'centralised node') that will decide whether to admit the new flow" into "PCN-boundary-node needs to know address of admission-decision-node that will decide whether to admit the new flow" Then it can cover the following scenario the original texts did not cover. 1) admission control is made on the egress node (the original text only includes the ingress node makes the decision) 2) ingress node can also notify the centralised node (the original text only includes the egress node notifies the centralised node) =20 B. R. Tina Messengers:=20 MSN: tinatsou6@hotmail.com Yahoo: tina_tsou Skype: tinaTSOU Jabber: tina@jabber.org Google talk: tinatsou6@gmail.com ------_=_NextPart_001_01C7D09F.86C735C9 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi = Tina,

I think the issue is that the = egress node needs to know the address and port number of the ingress node that = physically admitted the flow into the PCN-domain.

The egress node needs to send = pre-congestion and congestion information that is associated with the flow or flow = aggregate back to the ingress node directly or possible through a centralized = entity. The ingress node needs to enforce the stop admission or flow termination = decision.

 

The issue of where admission or = flow termination decision is made is a separate topic of discussion. We = should have a discussion on the benefits of where the decision should be made, on = ingress, egress, some centralizes point or hybrid e.g., flow admission is done in ingress and flow termination at egress, but in all cases enforcement of = the decision in at the ingress node.

Regards, = Joe
email:babiarz@nortel.com
Telephone:613-763-6098

From: Tina = TSOU [mailto:tena@huawei.com]
Sent: July 25, 2007 11:01 = AM
To: pcn@ietf.org
Subject: [PCN] = addressing

 

Hi all,
What I was going to comment on "eardley-pcn-architecture-00" presentation just after the line cut is below.
How about refine slide page 7
"PCN-egress-node needs to know address of PCN-ingress-node (or ‘centralised node’) that will decide whether to admit the = new flow"
into
"PCN-boundary-node needs to know address of admission-decision-node = that will decide whether to admit the new = flow"

Then it can cover the following scenario the original = texts did not cover.

1) admission control is made on the egress node (the original text only includes the ingress node makes the = decision)

2) ingress node can also notify the centralised node = (the original text only includes the egress node notifies the centralised = node)

 
B. R.
Tina
Messengers:
MSN: tinatsou6@hotmail.com &nbs= p; Yahoo: tina_tsou    Skype: tinaTSOU    = Jabber: tina@jabber.org    = Google talk: tinatsou6@gmail.com=

------_=_NextPart_001_01C7D09F.86C735C9-- --===============0856854287== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0856854287==-- From pcn-bounces@ietf.org Sat Jul 28 01:10:10 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEeZ4-0002uM-Ug; Sat, 28 Jul 2007 01:10:06 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEeZ3-0002sE-NX for pcn-confirm+ok@megatron.ietf.org; Sat, 28 Jul 2007 01:10:05 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEeZ1-0002rz-Kw for pcn@ietf.org; Sat, 28 Jul 2007 01:10:03 -0400 Received: from hiltonsmtp.worldspice.net ([216.37.94.58]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IEeZ0-0000yU-Ou for pcn@ietf.org; Sat, 28 Jul 2007 01:10:03 -0400 Received: (qmail 15857 invoked by uid 0); 28 Jul 2007 05:02:22 -0000 Received: by simscan 1.2.0 ppid: 15849, pid: 15853, t: 1.3238s scanners: clamav: 0.90.2/m: spam: 3.1.8 X-Spam-Checker-Version: SpamAssassin 3.2.1 (2007-05-02) on hiltonsmtp.worldspice.net X-Spam-Level: * X-Spam-Status: No, score=1.0 required=6.2 tests=ALL_TRUSTED,BAYES_60, HTML_MESSAGE autolearn=disabled version=3.2.1 Received: from unknown (HELO jys3105121962) (z24109@67.97.210.2) by hiltonsmtp.worldspice.net with ESMTPA; 28 Jul 2007 05:02:20 -0000 Message-ID: <003e01c7d0d5$8a4b4a70$c8aa1cac@jys3105121962> From: "Tina TSOU" To: , "Jozef Babiarz" References: <017a01c7cecc$a8c43670$4fa81cac@jys3105121962> <9671A92C3C8B5744BC97F855F7CB6465117A7467@zcarhxm1.corp.nortel.com> Subject: Re: [PCN] addressing Date: Sat, 28 Jul 2007 00:09:50 -0500 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Spam-Score: 0.0 (/) X-Scan-Signature: 10dcc25e55b9b5f7d6ded516404bdc4c Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0104696617==" Errors-To: pcn-bounces@ietf.org This is a multi-part message in MIME format. --===============0104696617== Content-Type: multipart/alternative; boundary="----=_NextPart_000_003B_01C7D0AB.9D871850" This is a multi-part message in MIME format. ------=_NextPart_000_003B_01C7D0AB.9D871850 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Joe, Thanks for reply:) I saw the need egress needs to know the address and = port number of the ingress. If only pre-congestion and congestion = information is sent, I agree that the original texts already cover all = the cases. I thought not only pre-congestion and congestion information is sent, so = my comments were based on the architecture draft have the decision made = in any of the ingress, egress, and centralized node. =20 B. R. Tina Messengers:=20 MSN: tinatsou6@hotmail.com Yahoo: tina_tsou Skype: tinaTSOU = Jabber: tina@jabber.org Google talk: tinatsou6@gmail.com ----- Original Message -----=20 From: Jozef Babiarz=20 To: Tina TSOU ; pcn@ietf.org=20 Sent: Friday, July 27, 2007 5:43 PM Subject: RE: [PCN] addressing Hi Tina, I think the issue is that the egress node needs to know the address = and port number of the ingress node that physically admitted the flow = into the PCN-domain. The egress node needs to send pre-congestion and congestion = information that is associated with the flow or flow aggregate back to = the ingress node directly or possible through a centralized entity. The = ingress node needs to enforce the stop admission or flow termination = decision. =20 The issue of where admission or flow termination decision is made is a = separate topic of discussion. We should have a discussion on the = benefits of where the decision should be made, on ingress, egress, some = centralizes point or hybrid e.g., flow admission is done in ingress and = flow termination at egress, but in all cases enforcement of the decision = in at the ingress node. Regards, Joe=20 email:babiarz@nortel.com=20 Telephone:613-763-6098=20 -------------------------------------------------------------------------= ----- From: Tina TSOU [mailto:tena@huawei.com]=20 Sent: July 25, 2007 11:01 AM To: pcn@ietf.org Subject: [PCN] addressing =20 Hi all, What I was going to comment on "eardley-pcn-architecture-00" = presentation just after the line cut is below. How about refine slide page 7 "PCN-egress-node needs to know address of PCN-ingress-node (or = 'centralised node') that will decide whether to admit the new flow" into "PCN-boundary-node needs to know address of admission-decision-node = that will decide whether to admit the new flow" Then it can cover the following scenario the original texts did not = cover. 1) admission control is made on the egress node (the original text = only includes the ingress node makes the decision) 2) ingress node can also notify the centralised node (the original = text only includes the egress node notifies the centralised node) B. R. Tina Messengers:=20 MSN: tinatsou6@hotmail.com Yahoo: tina_tsou Skype: tinaTSOU = Jabber: tina@jabber.org Google talk: tinatsou6@gmail.com ------=_NextPart_000_003B_01C7D0AB.9D871850 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Joe,
Thanks for reply:) I saw the need = egress needs to=20 know the address and port number of the ingress. If only pre-congestion = and=20 congestion information is sent, I agree that the original texts already = cover=20 all the cases.
I thought not only pre-congestion and congestion = information=20 is sent, so my comments were based on the architecture draft have the = decision=20 made in any of the ingress, egress, and centralized = node.
 
B.=20 R.
Tina
Messengers:
MSN: tinatsou6@hotmail.com &nbs= p; Yahoo:=20 tina_tsou    Skype: tinaTSOU    Jabber: tina@jabber.org    = Google talk:=20 tinatsou6@gmail.com
 
----- Original Message -----
From:=20 Jozef = Babiarz=20
Sent: Friday, July 27, 2007 = 5:43 PM
Subject: RE: [PCN] = addressing

Hi=20 Tina,

I think the = issue is=20 that the egress node needs to know the address and port number of the = ingress=20 node that physically admitted the flow into the=20 PCN-domain.

The egress = node needs=20 to send pre-congestion and congestion information that is associated = with the=20 flow or flow aggregate back to the ingress node directly or possible = through a=20 centralized entity. The ingress node needs to enforce the stop = admission or=20 flow termination decision.

 

The issue = of where=20 admission or flow termination decision is made is a separate topic of=20 discussion. We should have a discussion on the benefits of where the = decision=20 should be made, on ingress, egress, some centralizes point or hybrid = e.g.,=20 flow admission is done in ingress and flow termination at egress, but = in all=20 cases enforcement of the decision in at the ingress=20 node.

Regards,=20 Joe=20
email:babiarz@nortel.com
Telephone:613-763-6098 =

From: Tina=20 TSOU [mailto:tena@huawei.com]
Sent: July 25, 2007 11:01 = AM
To: pcn@ietf.org
Subject: [PCN]=20 addressing

 

Hi all,
What I was = going to=20 comment on "eardley-pcn-architecture-00" presentation just after the = line cut=20 is below.
How about refine slide page 7
"PCN-egress-node needs = to know=20 address of PCN-ingress-node (or =91centralised node=92) that will = decide whether=20 to admit the new flow"
into
"PCN-boundary-node needs to know = address of=20 admission-decision-node that will decide whether to admit the new=20 flow"

Then it can cover the = following=20 scenario the original texts did not = cover.

1) admission control is = made on=20 the egress node (the original text only includes the ingress node = makes the=20 decision)

2) ingress node can also = notify=20 the centralised node (the original text only includes the egress node = notifies=20 the centralised node)


B. = R.
Tina
Messengers:=20
MSN: tinatsou6@hotmail.com &nbs= p;=20 Yahoo: tina_tsou    Skype: tinaTSOU    = Jabber:=20 tina@jabber.org    = Google=20 talk: tinatsou6@gmail.com=

------=_NextPart_000_003B_01C7D0AB.9D871850-- --===============0104696617== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn --===============0104696617==-- From pcn-bounces@ietf.org Sat Jul 28 03:44:47 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEgyl-0007n2-Gp; Sat, 28 Jul 2007 03:44:47 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IEgyj-0007mx-MH for pcn-confirm+ok@megatron.ietf.org; Sat, 28 Jul 2007 03:44:45 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IEgyg-0007mm-3w for pcn@ietf.org; Sat, 28 Jul 2007 03:44:42 -0400 Received: from smtp2.smtp.bt.com ([217.32.164.150]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IEgyf-0003XI-7n for pcn@ietf.org; Sat, 28 Jul 2007 03:44:42 -0400 Received: from i2kc08-ukbr.domain1.systemhost.net ([193.113.197.71]) by smtp2.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Sat, 28 Jul 2007 08:44:40 +0100 Received: from cbibipnt08.iuser.iroot.adidom.com ([147.149.100.81]) by i2kc08-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Sat, 28 Jul 2007 08:44:40 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt08.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 1185608678980; Sat, 28 Jul 2007 08:44:38 +0100 Received: from mut.jungle.bt.co.uk ([10.86.1.18]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l6S7hhnL001103; Sat, 28 Jul 2007 08:44:26 +0100 Message-Id: <5.2.1.1.2.20070726005100.04cc7e68@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Sat, 28 Jul 2007 08:43:04 +0100 To: menth@informatik.uni-wuerzburg.de From: Bob Briscoe Subject: Re: [PCN] Fwd: I-D ACTION:draft-eardley-pcn-architecture-00.txt In-Reply-To: <46A73B6D.6010601@informatik.uni-wuerzburg.de> References: <5.2.1.1.2.20070724140627.03c06a58@pop3.jungle.bt.co.uk> <5.2.1.1.2.20070724140627.03c06a58@pop3.jungle.bt.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 28 Jul 2007 07:44:40.0315 (UTC) FILETIME=[279274B0:01C7D0EB] X-Spam-Score: 0.0 (/) X-Scan-Signature: ff03b0075c3fc728d7d60a15b4ee1ad2 Cc: PCN IETF list X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Michael, I've cc'd the list - hope that's OK. Inline... At 13:00 25/07/2007, Michael Menth wrote: >Hi Bob, > >> >>* ECN _and_ PCN marking? >> >>" o Configured-termination-rate: [...] >> Normally it is configured to be less than >> the maximum rate at which PCN-traffic can be forwarded on the >> link, so that termination-marking occurs before any significant >> queuing, ECN-marking or loss of PCN-packets. >>" >> >>The above text implies (to me) that a PCN-interior router might do PCN >>marking _and_ also ECN marking just before drop. That also imposes a >>requirement on the encoding to be able to carry either in the same field. >>I don't think the authors meant either of these implications. So >>somewhere, the relation between PCN & ECN marking should be stated. >> >>Although this is perhaps too detailed for the architecture, I suggest >>that any need for ECN marking on the same path but outside the PCN >>domain(s) should be handled by tunnelling across the PCN domain, with a >>non-PCN DSCP in the inner header (that turns on the RFC3168 meaning of >>its ECN field) and a PCN DSCP in the outer. > >Are there applications using ECN in some networks and PCN in other >networks? If this is the case, reusing ECN bits might not be so good. On >the one hand, ECN markings could be taken into account by codecs to lower >their rate as congestion occurs in non-PCN-capable clouds. On the other >hand, ECN is intended for responsive elastic traffic and PCN for >non-responsive realtime traffic ... The possibility of wanting admission controlled reservations and adaptive codecs is now officially a frequently asked question (it's been discussed twice before)! I'll just refer you to the extensive discussion of the issue on the tsvwg list at the back end of 2005: One thread starts here - and quotes an offlist mail from 2004! Subject: RMD & pre-congestion notification: How edge-edge and end-end can interwork And another Subject: why use edge-to-edge ECN re-marking when DSCP re-marking can do it. This thread progressed onto the adaptation plus admission contrl issue at the end of this long posting: We should write up this issue in the arch doc to document some form of agreement on this issue once and for all. >Some other thoughts regarding the relation between ECN and PCN: >http://www1.ietf.org/mail-archive/web/pcn/current/msg00534.html Thanks for the pointer to previous list discussion. The basic answer to that discussion is that the lower threshold in the PCN virtual queue should be set so that there's v low probability of a real queue developing within a RTT of a level of PCN marking just below that necessary to trigger admission control. The main difference in outcome between PCN and ECN is meant to be that PCN has v low risk of real queuing and hence low risk of any queueing delay beyond 1-2 packets. >>* Marking is when "current" rate is "above" a reference rate? >> >>" o Admission-marking: the marking of PCN-packets by a PCN-node to >> indicate that the PCN-traffic on a link is above the configured- >> admissible-rate. >> >> o Termination-marking: the marking of PCN-packets by a PCN-node to >> indicate that the PCN-traffic on a link is above the configured- >> termination-rate. >>" >> >>These marking definitions and other examples hilighted in magenta in the >>above PDF prejudge marking mechanisms as rate measurements. >> >>We don't just have marking when the _current_rate is _above_ the >>reference rate. We can have marking when the _current_ rate is _below_, >>or when the _past_ rate was _above_. > >I am aware of the cases you mention. We look at time-dependent rates which >are hard to define anyway. I do not see a problem in this formulation >since it serves as an explanation, not as a technical specification which >may be approximative. Would adding the slack terms "within some tolerance" >improve the wording? It wasn't so much that marking might still occur below the threshold rate, as that I didn't want the impression conveyed that we were concerned about just rate and not about variance. I'm in a rush now, but I'll try for some suggested wording - feel free to also suggest some yourself before I get to it. I think you know what I mean as much as I do, it's just word smithing needed. >>>S6 Design goals and challenges >>>This briefly describes some open issues, taken from >>>briscoe-tsvwg-cl-architecture. Are there other ones that should be >>>mentioned? Is the problem description at the right level of depth? >>>Should we discuss various possible solutions to these problems? >> >>I get the feeling we need a doc specifically on ECMP solutions? > >Either that or individual approaches need to explicitly clarify their >operation in case of ECMP. That's what I would prefer. Yes - prob attempt to do this in each proposal I-D and on list first, and only go to a separate doc if we need to. Bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Sun Jul 29 05:46:31 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IF5M2-0003kv-DB; Sun, 29 Jul 2007 05:46:26 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IF5M0-0003ab-Kb for pcn-confirm+ok@megatron.ietf.org; Sun, 29 Jul 2007 05:46:24 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IF5Lw-0003Ts-1q for pcn@ietf.org; Sun, 29 Jul 2007 05:46:20 -0400 Received: from rotterdam.ewi.utwente.nl ([130.89.10.5]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IF5Lv-0005bm-1G for pcn@ietf.org; Sun, 29 Jul 2007 05:46:19 -0400 Received: from webmail.cs.utwente.nl (janus.ewi.utwente.nl [130.89.10.26]) by rotterdam.ewi.utwente.nl (8.13.6/8.13.6) with SMTP id l6T9kEKs028846; Sun, 29 Jul 2007 11:46:14 +0200 (MEST) Received: from 84.82.109.231 (auth. user karagian@imap2.cs.utwente.nl) by webmail.cs.utwente.nl with HTTP; Sun, 29 Jul 2007 09:46:14 +0000 To: "Anna Charny (acharny)" , "Lars Westberg (KI/EAB)" Date: Sun, 29 Jul 2007 09:46:13 +0000 X-Mailer: IlohaMail/0.8.13 (On: webmail.cs.utwente.nl) Message-ID: In-Reply-To: From: "Georgios Karagiannis" Bounce-To: "Georgios Karagiannis" MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0 () X-Scanned-By: MIMEDefang 2.52 on 130.89.10.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0rc3 (rotterdam.ewi.utwente.nl [130.89.10.5]); Sun, 29 Jul 2007 11:46:15 +0200 (MEST) X-Spam-Score: 0.0 (/) X-Scan-Signature: a87a9cdae4ac5d3fbeee75cd0026d632 Cc: PCN IETF list Subject: [PCN] Re: Some clarification questions about draft-westberg-pcn-load-control X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Anna Thank you very much for your remarks and questions! We will try to address all the issues that you have addressed in the next version of the draft! Best regards, Georgios On 7/27/2007, "Anna Charny (acharny)" wrote: >Hi Georgios and other authors of draft-westberg-pcn-load-control, > >There is some confusion that surfaced during and after the PCN WG >meetings regarding the details of the algorithm operation, and which I >was not able to clarify by reading the draft. Here are some of the >questions that I would appreciate some clarification. > >1) it is not clear how many configured rate thresholds is at the >internal nodes. The draft mentions congestion-detection-threshold, >severe_congestion_detection and severe_congestion_restoration. On the >other hand the presentation in Chicago (I believe) mentioned only two >thresholds. =20 > >2) Another question related the thresholds. The draft does not appear to > >define any explicit relationship between the two (three? See above) rate >thresholds other than describing which one is greater than the other. >However, if I understood Georgios correctly in the hallway conversation >in Chicago, it appears that it is implicitly assumed that in fact the >ratio between the two thresholds (which 2 of the three above?) is >assumed to be constant for all nodes in the network. Is there indeed >such an assumption, or did I misunderstand something? > >3) It is not entirely clear how many code points is actually needed by >the proposal. The draft mentions in different places "local-DSCP", >"original-dscp", "encoded-dscp", "affected-DSCP" and "notified DSCP". Do >we really need 5 states for this approach? Is it possible to clarify >which one is used for what? > >4)section 4.1.2 says: >" the difference between the congestion notification threshold and the >engineered bandwidth limitation, i.e. admission threshold, provides an >interval where the signaling information on resource limitation is >already sent by a node but the actual limitation is not reached". I do >not understand what this means. First - does it mean that there is one >more threshold ('engineered bandwidth limitation =3D admission rate' and >"congestion notification threshold"? (if so, that brings various >thresholds mentioned in the draft to 4, counting also >severe-congestion-notification and severe-congestion-restoration???). >Second, what "signal" do you mean here? Admission marking? Probe? >Termination marking? Can you clarify please? > >Next, one par below: "To distinguish between congestion notification >and severe congestion, the following method is used: The "encoded DSCP" >marking for congestion notification and severe congestion. When this >method is used and when the interior node is in "congestion >notification" state, then the node should remark the unmarked bytes >using the "encoded DSCP". =20 > >I am not sure I understand what the above means. What is the "method" >you refer to? Do you just mean that some packets are marked with >"encoded dscp" when the measurement of the total rate at the internal >node exceeds the severe-congestion-? threshold (which >-severe-congestion-notification or severe-congestion-restoration)?=20 > >5) There are two per-ingress-egress rate thresholds configured at each >*egress* (pre-configured congestion notification" threshold and >preconfigured severe congestion threshold). How are these egress >thresholds chosen? Is there any relationship between these thresholds >and the corresponding thresholds at the internal nodes? For example, is >there an assumption than the sum of the (egress) severe congestion >notification thresholds of all ingress-egress-pairs sharing a bottleneck >link does not exceed the severe congestion notification threshold at >that bottleneck link? =20 > >6) Section 4.1.3 says > >When the egress receives the probe packet, which is used as a request >for reservation, it will have to perform the following functionality. >When the operation state of the ingress/egress pair aggregate is the >"congestion notification", see Section 4.2.3, then the implementation of >the algorithm depends on how the congestion notification situation is >notified to the egress. As mentioned in Section 4.1.2 this is >accomplished by using the received data packets that are marked using >the "encoded DSCP". In this case, during a measurement interval T, the >egress measures the input_notified_bytes by counting instead of the >"notified DSCP", the "encoded DSCP" bytes." > >What exactly is "input_totified_bytes"? This is the first time this is >mentioned in the draft... Is it just the number of bytes marked with >"encoded DSCP"? =20 > >I have many more questions on the draft, but I am hoping that perhaps >the answers to the above will be helpful in understanding the rest of >the draft and/or will provide useful input where clarification may be >needed for the next version of the draft. > >It would also be helpful, if the next version of the draft either >directly uses pcn terminology, or at least provide the mapping where the >mapping is possible. =20 > >Thank you, >Anna=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Sun Jul 29 09:29:14 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IF8pe-0007gV-34; Sun, 29 Jul 2007 09:29:14 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IF8pc-0007gP-TP for pcn-confirm+ok@megatron.ietf.org; Sun, 29 Jul 2007 09:29:12 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IF8pc-0007gH-Je for pcn@ietf.org; Sun, 29 Jul 2007 09:29:12 -0400 Received: from rotterdam.ewi.utwente.nl ([130.89.10.5]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IF8pb-0001NZ-2m for pcn@ietf.org; Sun, 29 Jul 2007 09:29:12 -0400 Received: from webmail.cs.utwente.nl (janus.ewi.utwente.nl [130.89.10.26]) by rotterdam.ewi.utwente.nl (8.13.6/8.13.6) with SMTP id l6TDSsRT001513; Sun, 29 Jul 2007 15:28:58 +0200 (MEST) Received: from 84.82.109.231 (auth. user karagian@imap2.cs.utwente.nl) by webmail.cs.utwente.nl with HTTP; Sun, 29 Jul 2007 13:28:54 +0000 To: "Anna Charny (acharny)" , "Steven Blake" , "pcn" Subject: RE: [PCN] Consensus call: moving draft-chan-pcn-encoding-comparison-00to working group document Date: Sun, 29 Jul 2007 13:28:53 +0000 X-Mailer: IlohaMail/0.8.13 (On: webmail.cs.utwente.nl) Message-ID: In-Reply-To: From: "Georgios Karagiannis" Bounce-To: "Georgios Karagiannis" MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0 () X-Scanned-By: MIMEDefang 2.52 on 130.89.10.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0rc3 (rotterdam.ewi.utwente.nl [130.89.10.5]); Sun, 29 Jul 2007 15:29:05 +0200 (MEST) X-Spam-Score: 0.0 (/) X-Scan-Signature: f60d0f7806b0c40781eee6b9cd0b2135 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Anna, Hi all Yes we are committed to make changes and simplifications ans resend the draft to the list. Best Regards, Georgios On 7/27/2007, "Anna Charny (acharny)" wrote: >Hi, > >It is my understanding that the authors are committed to make changes >and simplifications and resend the draft to the list. In my opinion it >is worth waiting till the new version comes out before making it a >working group document. > >Thanks, >Anna=20 > >> -----Original Message----- >> From: Steven Blake [mailto:steven.blake@ericsson.com]=20 >> Sent: Friday, July 27, 2007 10:25 AM >> To: pcn >> Subject: [PCN] Consensus call: moving=20 >> draft-chan-pcn-encoding-comparison-00to working group document >>=20 >> PCN, >>=20 >> During the Chicago PCN meeting, the authors of=20 >> draft-chan-pcn-encoding-comparison-00 asked that this draft=20 >> become a working group document. Based on the discussion in=20 >> the room, the PCN chairs determined that there was no=20 >> consensus amongst the meeting participants to move this=20 >> version of the draft to a working group document at this=20 >> time. There was a comment made that if certain=20 >> simplifications were made in the next version of the draft=20 >> (e.g., reducing the amount of text on marking semantics and=20 >> concentrating on syntax), then the draft then would be ready=20 >> to move to working group document. The chairs asked the=20 >> authors to consider this approach. More details of the=20 >> discussion will be available when the meeting minutes are posted. >>=20 >> This email is a request for comments on moving=20 >> draft-chan-pcn-encoding-comparison-00 to working group=20 >> document. Please send your comments to the list within the next week. >>=20 >>=20 >> Scott & Steve >>=20 >> =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 >> Steven Blake >> Ericsson/Redback Networks +1 919-472-9913 >>=20 >>=20 >>=20 >> _______________________________________________ >> PCN mailing list >> PCN@ietf.org >> https://www1.ietf.org/mailman/listinfo/pcn >>=20 > > >_______________________________________________ >PCN mailing list >PCN@ietf.org >https://www1.ietf.org/mailman/listinfo/pcn _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 30 11:14:10 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFWwk-0007nK-5k; Mon, 30 Jul 2007 11:14:10 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IFWwi-0007ms-Ah for pcn-confirm+ok@megatron.ietf.org; Mon, 30 Jul 2007 11:14:08 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFWwh-0007mX-7n for pcn@ietf.org; Mon, 30 Jul 2007 11:14:07 -0400 Received: from imr2.ericy.com ([198.24.6.3]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IFWwg-0007gz-LA for pcn@ietf.org; Mon, 30 Jul 2007 11:14:07 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr2.ericy.com (8.13.1/8.13.1) with ESMTP id l6UFHTJ4022185; Mon, 30 Jul 2007 10:17:29 -0500 Received: from eusrcmw721.eamcs.ericsson.se ([138.85.77.21]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Mon, 30 Jul 2007 10:14:04 -0500 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] A draft consolidating different PCN proposals Date: Mon, 30 Jul 2007 10:14:03 -0500 Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] A draft consolidating different PCN proposals Thread-Index: AcfPm5uLE3qvkh/CRFSi0EwPez44dADHt24g References: From: "Anurag Bhargava (RL/TNT)" To: "Anna Charny (acharny)" , "PCN IETF list" X-OriginalArrivalTime: 30 Jul 2007 15:14:04.0879 (UTC) FILETIME=[4487E5F0:01C7D2BC] X-Spam-Score: 0.0 (/) X-Scan-Signature: 082a9cbf4d599f360ac7f815372a6a15 Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Anna, As mentioned in other email thread by Georgios that we are in the process of preparing the next version of draft-westberg-pcn-load-control. =20 I was thinking of comparing (differences) various schemes mainly at the following three points in three subsections: - Ingress Node - Interior Node - Egress Node Then, a subsection for each scheme stating their benefits/drawbacks. We will provide our take after submitting the next version of LC which should be soon. I know we were talking about setting Sept as a temporary deadline for this work. Do you want to suggest any specific deadline when to receive feedback from various schemes for the consolidation draft? BR, Anurag > -----Original Message----- > From: Anna Charny (acharny) [mailto:acharny@cisco.com]=20 > Sent: Thursday, July 26, 2007 11:43 AM > To: PCN IETF list > Subject: [PCN] A draft consolidating different PCN proposals >=20 > Hi all, >=20 > Following the discussion in the PCN WG meeting yesterday and=20 > as a result of follow-up hallway discussions, the authors of=20 > various proposals seem to have come up with a common language=20 > to describe all the different PCN proposals and a preliminary=20 > view on their relative cons and pros. I have volunteered to=20 > produce a consolidated draft which will attempt to discuss=20 > all current proposals in the same framework and take the=20 > first cut on comparison criteria and how it is met by=20 > different approaches. =20 >=20 > We already have a number of comparison criteria loosely used=20 > in discussions. I am requesting feedback from the list with=20 > suggestions for specific performance criteria suggestions.=20 > Those who have already sent those to me privately may wish to=20 > resend them to the list.=20 >=20 > I am also requesting that the authors of each proposed=20 > mechanism send their view of the cons and pros they see of=20 > their specific approach (functional, deployment, performance,=20 > etc). Of course similar feedback is also welcome from the entire list. >=20 > Thank you, > Anna=20 >=20 > =20 >=20 >=20 > _______________________________________________ > PCN mailing list > PCN@ietf.org > https://www1.ietf.org/mailman/listinfo/pcn >=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 30 11:20:51 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFX3D-0002UH-Lb; Mon, 30 Jul 2007 11:20:51 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IFX3B-0002Jt-Me for pcn-confirm+ok@megatron.ietf.org; Mon, 30 Jul 2007 11:20:49 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFX3B-0002Jj-CF for pcn@ietf.org; Mon, 30 Jul 2007 11:20:49 -0400 Received: from smtp104.rog.mail.re2.yahoo.com ([206.190.36.82]) by chiedprmail1.ietf.org with smtp (Exim 4.43) id 1IFX3B-0007rD-1o for pcn@ietf.org; Mon, 30 Jul 2007 11:20:49 -0400 Received: (qmail 85943 invoked from network); 30 Jul 2007 15:20:48 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=rogers.com; h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=4FyupJ9Kye8lRa4OwLOC4/+6JDcVuOK7WQTksM/UQjgfGuZQmNZKw7VmWFdUCyCLeopxUk4Ng+n4UIk5K/jYsD2pd+B3jG5siGmED09MuCj4OprLVNcmIquS8Kx5JYb36BGrhVh5+QozpMRDtNURqZDK+OndqwL8SN0Orc0GWqg= ; Received: from unknown (HELO ?192.168.0.101?) (tom.taylor@rogers.com@74.105.35.229 with plain) by smtp104.rog.mail.re2.yahoo.com with SMTP; 30 Jul 2007 15:20:48 -0000 X-YMail-OSG: tBZJT1cVM1kWdPXZc.j_g14XxQrJ5.9mCieUEgK2BZfH2QDa79N_2dRyVof0dhmysQ-- Message-ID: <46AE01D2.8040400@rogers.com> Date: Mon, 30 Jul 2007 11:20:50 -0400 From: Tom Taylor User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: Steven Blake Subject: Re: [PCN] Consensus call: moving draft-eardley-pcn-architecture-00.txt to working group document References: <1185545764.3508.7.camel@neutrino> In-Reply-To: <1185545764.3508.7.camel@neutrino> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Scan-Signature: cf4fa59384e76e63313391b70cd0dd25 Cc: pcn X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org I am in favour of making this a WG document. Steven Blake wrote: > PCN, > > During the Chicago PCN meeting, the authors of > draft-eardley-pcn-architecture-00 asked that this draft become a working > group document. Based on the discussion in the room, the PCN chairs > determined that there was consensus amongst the meeting participants to > move the draft to a working group document. > > This email is a request for comments on moving this draft to working > group document. Please send your comments to the list within the next > week. > > Scott & Steve _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 30 12:06:28 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFXlM-00031m-3b; Mon, 30 Jul 2007 12:06:28 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IFXlK-00030Y-7c for pcn-confirm+ok@megatron.ietf.org; Mon, 30 Jul 2007 12:06:26 -0400 Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFXlJ-00030D-TE for pcn@ietf.org; Mon, 30 Jul 2007 12:06:25 -0400 Received: from rtp-iport-2.cisco.com ([64.102.122.149]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1IFXlI-0001U0-Jb for pcn@ietf.org; Mon, 30 Jul 2007 12:06:25 -0400 Received: from rtp-dkim-2.cisco.com ([64.102.121.159]) by rtp-iport-2.cisco.com with ESMTP; 30 Jul 2007 12:06:08 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAEaprUZAZnmf/2dsb2JhbAA X-IronPort-AV: i="4.19,199,1183348800"; d="scan'208"; a="127411128:sNHT4551948460" Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id l6UG67cu024414; Mon, 30 Jul 2007 12:06:07 -0400 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id l6UG5gWc029562; Mon, 30 Jul 2007 16:06:07 GMT Received: from xmb-rtp-203.amer.cisco.com ([64.102.31.20]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 30 Jul 2007 12:05:48 -0400 X-Mimeole: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [PCN] A draft consolidating different PCN proposals Date: Mon, 30 Jul 2007 12:05:47 -0400 Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [PCN] A draft consolidating different PCN proposals Thread-Index: AcfPm5uLE3qvkh/CRFSi0EwPez44dADHt24gAAIIulA= From: "Anna Charny \(acharny\)" To: "Anurag Bhargava \(RL/TNT\)" , "PCN IETF list" X-OriginalArrivalTime: 30 Jul 2007 16:05:48.0365 (UTC) FILETIME=[7E5A47D0:01C7D2C3] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=3703; t=1185811567; x=1186675567; c=relaxed/simple; s=rtpdkim2001; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=acharny@cisco.com; z=From:=20=22Anna=20Charny=20\(acharny\)=22=20 |Subject:=20RE=3A=20[PCN]=20A=20draft=20consolidating=20different=20PCN=2 0proposals |Sender:=20 |To:=20=22Anurag=20Bhargava=20\(RL/TNT\)=22=20,=0A=20=20=20=20=20=20=20=20=22PCN=20IETF=20list=22=20; bh=yzF2zcwadZ1KWX4NB0dRi9ACzKvdijKzUhL3y1msKUg=; b=uZiWzDLjao4m1DGNWs/lhnZW9kboeoMwuFUHpfHFeBH9/isOJfVFF15+EjRaH8sh84jgAche CyjdDn9S8FM6HRI2kQVg5ZU2qKD/TNX1W3bOqeQ2p2L3XP2eZ8xHtmZy; Authentication-Results: rtp-dkim-2; header.From=acharny@cisco.com; dkim=pass ( sig from cisco.com/rtpdkim2001 verified; ); X-Spam-Score: -4.0 (----) X-Scan-Signature: 8de5f93cb2b4e3bee75302e9eacc33db Cc: X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Hi Anurag, Thanks. I think the first and very important step would be to get the second version of the draft so the algorithmic details become clearer. We can worry about comparisons later - it is most important that the details of all proposals are clarified first. =20 There are many comparison criteria to be used. Some ofthem are functional as you suggest, some are performance-related, etc. So yes, please do provide your view on what you feel are important benefits. On your question about the timeline: September will probably still be all right, although it would really be helpful if algorithmic details of the draft-westberg proposal are clarified before that (e.g. mid-August if at all possible?). One way to do so would be by email (e.g. answering some of the questions that I asked on the list). The sooner we get clarity on the algorithmic details, the sooner it will be possible to start on the comparison draft. Thank you, Anna=20 > -----Original Message----- > From: Anurag Bhargava (RL/TNT) [mailto:anurag.bhargava@ericsson.com]=20 > Sent: Monday, July 30, 2007 11:14 AM > To: Anna Charny (acharny); PCN IETF list > Subject: RE: [PCN] A draft consolidating different PCN proposals >=20 > Anna, > As mentioned in other email thread by Georgios that we are=20 > in the process of preparing the next version of=20 > draft-westberg-pcn-load-control. > =20 > I was thinking of comparing (differences) various schemes=20 > mainly at the following three points in three subsections: > - Ingress Node > - Interior Node > - Egress Node >=20 > Then, a subsection for each scheme stating their benefits/drawbacks. >=20 > We will provide our take after submitting the next version of=20 > LC which should be soon. I know we were talking about setting=20 > Sept as a temporary deadline for this work. Do you want to=20 > suggest any specific deadline when to receive feedback from=20 > various schemes for the consolidation draft? >=20 > BR, > Anurag >=20 > > -----Original Message----- > > From: Anna Charny (acharny) [mailto:acharny@cisco.com] > > Sent: Thursday, July 26, 2007 11:43 AM > > To: PCN IETF list > > Subject: [PCN] A draft consolidating different PCN proposals > >=20 > > Hi all, > >=20 > > Following the discussion in the PCN WG meeting yesterday and as a=20 > > result of follow-up hallway discussions, the authors of various=20 > > proposals seem to have come up with a common language to=20 > describe all=20 > > the different PCN proposals and a preliminary view on their=20 > relative=20 > > cons and pros. I have volunteered to produce a consolidated draft=20 > > which will attempt to discuss all current proposals in the same=20 > > framework and take the first cut on comparison criteria and=20 > how it is=20 > > met by different approaches. > >=20 > > We already have a number of comparison criteria loosely used in=20 > > discussions. I am requesting feedback from the list with=20 > suggestions=20 > > for specific performance criteria suggestions. > > Those who have already sent those to me privately may wish=20 > to resend=20 > > them to the list. > >=20 > > I am also requesting that the authors of each proposed=20 > mechanism send=20 > > their view of the cons and pros they see of their specific approach=20 > > (functional, deployment, performance, etc). Of course=20 > similar feedback=20 > > is also welcome from the entire list. > >=20 > > Thank you, > > Anna > >=20 > > =20 > >=20 > >=20 > > _______________________________________________ > > PCN mailing list > > PCN@ietf.org > > https://www1.ietf.org/mailman/listinfo/pcn > >=20 >=20 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Mon Jul 30 22:52:35 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFhqc-0004Fn-W9; Mon, 30 Jul 2007 22:52:34 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IFhqc-0004Fh-52 for pcn-confirm+ok@megatron.ietf.org; Mon, 30 Jul 2007 22:52:34 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IFhqb-0004FX-R3 for pcn@ietf.org; Mon, 30 Jul 2007 22:52:33 -0400 Received: from imr1.ericy.com ([198.24.6.9]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IFhqb-0004Rm-9N for pcn@ietf.org; Mon, 30 Jul 2007 22:52:33 -0400 Received: from eusrcmw751.eamcs.ericsson.se (eusrcmw751.exu.ericsson.se [138.85.77.51]) by imr1.ericy.com (8.13.1/8.13.1) with ESMTP id l6V2vPwU019681; Mon, 30 Jul 2007 21:57:26 -0500 Received: from eusrcmw750.eamcs.ericsson.se ([138.85.77.50]) by eusrcmw751.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Mon, 30 Jul 2007 21:52:29 -0500 Received: from [147.117.169.108] ([147.117.169.108]) by eusrcmw750.eamcs.ericsson.se with Microsoft SMTPSVC(6.0.3790.1830); Mon, 30 Jul 2007 21:52:29 -0500 Subject: Re: [PCN] could multicast service be supported in a PCN domain? From: Steven Blake To: ken carlberg In-Reply-To: References: <000001c7ce9e$eddd5ad0$4b0c6f0a@china.huawei.com> <9671A92C3C8B5744BC97F855F7CB646511701910@zcarhxm1.corp.nortel.com> Content-Type: text/plain Organization: Ericsson IP Infrastructure Date: Mon, 30 Jul 2007 22:52:28 -0400 Message-Id: <1185850349.4042.37.camel@neutrino> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 31 Jul 2007 02:52:29.0480 (UTC) FILETIME=[D59E9280:01C7D31D] X-Spam-Score: 0.0 (/) X-Scan-Signature: 0bc60ec82efc80c84b8d02f4b0e4de22 Cc: pcn@ietf.org X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org On Wed, 2007-07-25 at 16:13 -0500, ken carlberg wrote: > A question to the chairs. When would be a reasonable time to bring up > a new topic like multicast to the group in the form of a draft-rfc? > Personally, I wouldn't mind seeing something around the time that Phil > Eardley's Architecture draft is at working group last call to at least > get a tangible feel of the specifics so as to make a more informed > decision then as to its acceptance. If someone has ideas about what (if any) changes are needed to PCN to accommodate multicast flows, the sooner you can document this the better. > I also wouldn't mind to at least hear on this list in the coming > week(s), ever so briefly, what Delei would like to explore. I suspect > that this list will quiet down shortly and for a period of time as > author's go working on comments of the past week and from today's > meeting. Hopefully you are wrong about this. Regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Steven Blake Ericsson/Redback Networks +1 919-472-9913 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn From pcn-bounces@ietf.org Tue Jul 31 22:08:06 2007 Return-path: Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1IG3d8-00064U-0e; Tue, 31 Jul 2007 22:08:06 -0400 Received: from pcn by megatron.ietf.org with local (Exim 4.43) id 1IG3d6-00062x-OI for pcn-confirm+ok@megatron.ietf.org; Tue, 31 Jul 2007 22:08:04 -0400 Received: from [10.90.34.44] (helo=chiedprmail1.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1IG3d6-00062k-CM for pcn@ietf.org; Tue, 31 Jul 2007 22:08:04 -0400 Received: from smtp1.smtp.bt.com ([217.32.164.137]) by chiedprmail1.ietf.org with esmtp (Exim 4.43) id 1IG3d5-0005XU-CR for pcn@ietf.org; Tue, 31 Jul 2007 22:08:04 -0400 Received: from i2kc06-ukbr.domain1.systemhost.net ([193.113.197.70]) by smtp1.smtp.bt.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 1 Aug 2007 03:08:02 +0100 Received: from cbibipnt05.iuser.iroot.adidom.com ([147.149.196.177]) by i2kc06-ukbr.domain1.systemhost.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 1 Aug 2007 03:08:02 +0100 Received: From bagheera.jungle.bt.co.uk ([132.146.168.158]) by cbibipnt05.iuser.iroot.adidom.com (WebShield SMTP v4.5 MR1a P0803.399); id 118593408133; Wed, 1 Aug 2007 03:08:01 +0100 Received: from mut.jungle.bt.co.uk ([10.86.0.9]) by bagheera.jungle.bt.co.uk (8.13.5/8.12.8) with ESMTP id l7127qgY015095; Wed, 1 Aug 2007 03:07:58 +0100 Message-Id: <5.2.1.1.2.20070801015324.04b7eb78@pop3.jungle.bt.co.uk> X-Sender: rbriscoe@pop3.jungle.bt.co.uk X-Mailer: QUALCOMM Windows Eudora Version 5.2.1 Date: Wed, 01 Aug 2007 03:02:41 +0100 To: Sally Floyd From: Bob Briscoe In-Reply-To: <3144d54f51c807e534a10759210d5729@mac.com> References: <5.2.1.1.2.20070617041232.04188110@pop3.jungle.bt.co.uk> <5.2.1.1.2.20070617041232.04188110@pop3.jungle.bt.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 132.146.168.158 X-OriginalArrivalTime: 01 Aug 2007 02:08:02.0492 (UTC) FILETIME=[CA623FC0:01C7D3E0] X-Spam-Score: 0.0 (/) X-Scan-Signature: 0770535483960d190d4a0d020e7060bd Cc: PCN IETF list , DCCP IETF list , tsvwg IETF list Subject: [PCN] Re: [dccp] Initial I-D: draft-briscoe-tsvwg-byte-pkt-mark-00 X-BeenThere: pcn@ietf.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: PCN WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: pcn-bounces@ietf.org Sally, Again, catching up on my backlog - apologies for delayed reply... At 00:30 20/07/2007, Sally Floyd wrote: >Bob - > >Some feedback on "Byte and Packet Congestion Notification", >draft-briscoe-tsvwg-byte-pkt-mark-00: > >It seems odd to me to talk about RED in byte vs. packet mode, and >not to talk about the similar performance difference between >Drop-Tail queues in bytes vs. packets. (Well, someone could >care about RED and not Drop-Tail because one cared only >about packet marks in an ECN environment, but for this document >it strikes me as quite odd to talk about RED in byte vs. packet mode, >and not to talk also about Drop-Tail queues in bytes vs. packets.) > >I am enclosing some text from some 2/26/2007 email that I sent you >about this, in response to "draft-briscoe-tsvwg-byte-pkt-mark-00c". >(I didn't reread the new draft, but I did look at the diffs between >draft-briscoe-tsvwg-byte-pkt-mark-00 and >draft-briscoe-tsvwg-byte-pkt-mark-00c, and I didn't notice anything >added about Drop-Tail queues in bytes vs. packets.) After I had posted the draft, I realised I still hadn't taken this point you made into account. Sorry about that - it will be in the -01 update. I tried to make up for this at least in my presentation in Chicago, where I warned people not to turn off RED altogether (actually, I hadn't read this latest email from you before last week's presentation, but I had remembered this excellent point you had made in your previous offlist email). But I accept, there's a lot more to this issue that I need to address properly in the next draft. > From my 2/26/2007 email: >---------------------------------------------------------------- >"As is discussed at length and illustrated with simulations in [RFC >4828], drop-tail queues also have a wide range of possible behaviors, >in terms of dropping packets from a flow proportionally to the >sending rate in bits per second, or to the sending rate in packets >per second, or something else entirely. For example, the abstract >of [RFC 4828] includes the following:" > > "Flows using TFRC-SP compete reasonably fairly with large-packet TCP > and TFRC flows in environments where large-packet flows and small- > packet flows experience similar packet drop rates. However, in > environments where small-packet flows experience lower packet drop > rates than large-packet flows (e.g., with Drop-Tail queues in units > of bytes), TFRC-SP can receive considerably more than its share of > the bandwidth." > >"This is discussed more in Section 4.5.1, and in Appendix B.3 of that draft." My immediate thought was that, if a vendor is implementing AQM, they are offering an alterantive to drop tail, so I was giving advice on whether to take a packet's size into account when deciding whether to drop it _in an AQM algorithm_. You are right that my line of reasoning leads to the conclusion that I made - that transports should take account of packet size, not AQM algorithms. You are right that transports using small packets will see less drop from unmodified (drop tail) queues. So if such transports scale down their response to smaller dropped packets (as TFRC-SP proposes), they will go faster than transports sending large packets that compete for the same drop-tail queue. My reasoning then goes that we, the IETF, need to decide unequivocally where this bias should be reversed: a) treat the cause, by recommending AQM with packet-mode drop wherever possible? b) treat the symptom, by recommending transports don't take account of packet size? The more successful we are at a), the more b) type solutions will be incorrect, and we will instead want transports to take account of packet size. If we believed b) was the right approach, we shouldn't have ever recommended a). But it's too late to turn back, because we already recommended a) - largely because we wanted to remove the bias towards small packets of drop tail. And I believe RED is now very widely deployed (BT have certainly deployed it, and I believe it is common elsewhere). I also believe a) was (and still is) the better path. I believe we should press on with a), encouraging AQM. Not turn back now. I also don't believe we can expect the industry to follow both paths, without adding considerable complexity to the Internet. >"My understanding is that buffer architectures in routers can be >complex, but one buffer architecture is to have a fixed number of >slots for packet headers in the output queue, with the actual data >packet stored elsewhere in the router. So in this design, the queue >would essentially have a fixed number of slots for packet headers, >with each packet taking exactly one packet-header slot, regardless >of the packet size in bytes. This is surely the question of how to measure the queue length in order to decide an interim drop probability, not how to determine whether to modify the interim drop probability dependent on the size of the packet currently being considered for drop. I believe I correctly reflected your advice on queue measurement in my sections 4 & 6.1. >Functionally, this would be equivalent >to a Drop-Tail queue in packets in NS. I don't believe this is correct. - As an overloaded drop tail queue forwards packets to the line, at any one time it is more likely to have made space for an arriving small packet than a large one. So the drop rate of larger packets will be greater. - As an overloaded queue of fixed size headers forwards packets to the line, no more space is needed for the header of a large packet than a small one, so the drop rate of large and small packets will be the same (assuming the buffer for the payloads held elsewhere is not the limiting resource) Am I missing something? >But there could also be >routers whose Drop-Tail queues are more like the Drop-Tail queue >in bytes in NS, where small packets are more likely than large >packets to find a slot in the queue. So the complications are not >only about AQM..." The general point is true, that the complications are not only about AQM. Even tho I think the specific sentence I objected to above is wrong, it doesn't invalidate your general argument that this isn't only about AQM, which I hope I have addressed now, and I will also try to address more rigorously in the -01 update of this draft. >---------------------------------------------------------------- > > >As an aside, in the future should I forward feedback about this draft to >only one of the three mailing lists above? I think tsvwg will be enough (as requested in the draft). I was just hiliting the existence of this draft to the other lists it was relevant to, but discussion not specific to one of the other w-gs need only be on tsvwg. I've cc'd them one last time, so anyone who wants to follow this discussion knows where it has gone. Cheers Bob ____________________________________________________________________________ Bob Briscoe, Networks Research Centre, BT Research B54/77 Adastral Park,Martlesham Heath,Ipswich,IP5 3RE,UK. +44 1473 645196 _______________________________________________ PCN mailing list PCN@ietf.org https://www1.ietf.org/mailman/listinfo/pcn