From nobody Sun Mar 1 14:04:32 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1CF971A037C for ; Sun, 1 Mar 2015 14:04:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.7 X-Spam-Level: X-Spam-Status: No, score=-0.7 tagged_above=-999 required=5 tests=[BAYES_40=-0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KBVfGURM_Qgn for ; Sun, 1 Mar 2015 14:04:29 -0800 (PST) Received: from mail-wi0-f169.google.com (mail-wi0-f169.google.com [209.85.212.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 15F481A001C for ; Sun, 1 Mar 2015 14:04:28 -0800 (PST) Received: by wiwh11 with SMTP id h11so10885532wiw.3 for ; Sun, 01 Mar 2015 14:04:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:from:to:cc:references:in-reply-to:subject :date:message-id:mime-version:content-type:thread-index :content-language; bh=K3NoYIYP9LxpyLCfTjmBxhWvPEMS4UxCiz74zV9kPFI=; b=cowrmsGhBhc7d6/uMMeScXJi+odTMtIswS8G3IJm+HxfzIlSVnONffqmy88i6EznE3 H9UguRvy8uOyO7rEr4kquV5w0tOlycuImUEg0h6p3lKNDF5lUOsxRy59YyDYOQoetPpx Lb/NZG4CQshilrF+nD9CeWnnTwO2gkw3UcZX0RyAspr5mefRn4hHGoKpW5CEma5p8yjZ d6uNRlEoGgsCvn3oDviPVOG02HIG1EYCdl3fSsEAX6xktS90c50g6qMlMl5BjHy/P/eU gk92M+m4cDSmhNt6rNv6gIrCDww0q7uVWRNFg6dDV7DwBq0jeTAbJ05jw5HbO8mP/G6n xsjw== X-Gm-Message-State: ALoCoQkioQY6Sz3CvW9tYYyeyjjF2uaL6rojvl2oD+6YxbSkH+rICw4gbT5RQmyNjD+UTSqazS8Y X-Received: by 10.180.100.98 with SMTP id ex2mr29344090wib.65.1425247467769; Sun, 01 Mar 2015 14:04:27 -0800 (PST) Received: from Serenity (88-97-23-122.dsl.zen.co.uk. [88.97.23.122]) by mx.google.com with ESMTPSA id hj10sm16439437wjc.48.2015.03.01.14.04.26 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 01 Mar 2015 14:04:26 -0800 (PST) Sender: Daniel King X-Google-Original-Sender: "Daniel King" From: "Daniel King" To: References: In-Reply-To: Date: Sun, 1 Mar 2015 22:04:18 -0000 Message-ID: <001901d0546b$ab09bb80$011d3280$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01D0546B.AB09BB80" X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQINsqWMegxD4ortO22aIT6fI7X6uJyNcHIQ Content-Language: en-gb Archived-At: Cc: 'Joydeep Banerjee' Subject: Re: [Pce] 'Re: draft-ietf-pce-segment-routing-00' X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Mar 2015 22:04:31 -0000 This is a multipart message in MIME format. ------=_NextPart_000_001A_01D0546B.AB09BB80 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi All,=20 =20 Unfortunately the contents of the email from Joydeep was removed when it = arrived at the list. Below is the original message/question. If the = segment routing authors could respond, I am sure it would be = appreciated.=20 =20 BR, Dan.=20 =20 >>=20 From: Joydeep Banerjee joydeepb.2009@gmail.com = =20 Re: draft-ietf-pce-segment-routing-00 =20 Sec 5.1.1.1 - Exchanging SR Capability - number of SID (MSD value) is = negotiated at the PCEP session level. This is initiated only by the head = end PCC based on its data plane capability. However shouldn't it also = account for the finite label stacking ability of MPLS data plane for = transit routers? Let us assume, head end PCC (say S) can handle a MPLS = label stack depth of 10 (i.e. MSD =3D 10), so PCEP sessions is initiated = by S with OPEN message carrying SR-PCE-CAPABILITY MSD =3D 10 to SR = capable PCE of its choice. Next S has a requirement to get a SR TE path = to destination D and consults SR capable PCE. PCE gets back to S with a = label stack of 7 (less that MSD of 10). So S appends 7 SIDs from SR-ERO = in LIFO order to the outgoing packets to C (the next SR enabled router = towards D). C pops the topmost label and tries to forwards the packet, = but it appears that it's data plane can't support more than 2 MPLS label = stack. So C drops the packets. =20 How do you handle the scenario? <<=20 ------=_NextPart_000_001A_01D0546B.AB09BB80 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi All,

 

Unfortunately the contents of the email from = Joydeep was removed when it arrived at the list. Below is the original = message/question. If the segment routing authors could respond, I am = sure it would be appreciated.

 

BR, Dan.

 

>> 

From: Joydeep Banerjee joydeepb.2009@gmail.com<= /o:p>

Re: = draft-ietf-pce-segment-routing-00

 

Sec 5.1.1.1 - Exchanging SR Capability - = number of SID (MSD value) is negotiated at the PCEP session level. This = is initiated only by the head end PCC based on its data plane = capability. However shouldn't it also account for the finite label = stacking ability of MPLS data plane for transit routers? Let us assume, = head end PCC (say S) can handle a MPLS label stack depth of 10 (i.e. MSD = =3D 10), so PCEP sessions is initiated by S with OPEN message carrying = SR-PCE-CAPABILITY MSD =3D 10 to SR capable PCE of its choice. Next S has = a requirement to get a SR TE path to destination D and consults SR = capable PCE. PCE gets back to S with a label stack of 7 (less that MSD = of 10). So S appends 7 SIDs from SR-ERO in LIFO order to the outgoing = packets to C (the next SR enabled router towards D). C pops the topmost = label and tries to forwards the packet, but it appears that it's data = plane can't support more than 2 MPLS label stack. So C drops the = packets.

 

How do you handle the = scenario?

<< 

------=_NextPart_000_001A_01D0546B.AB09BB80-- From nobody Sun Mar 1 20:18:29 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C55081A0066 for ; Sun, 1 Mar 2015 20:18:27 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.211 X-Spam-Level: X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id V0Ak4qn9lh5M for ; Sun, 1 Mar 2015 20:18:25 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 72ABA1A000E for ; Sun, 1 Mar 2015 20:18:25 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml406-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BPT51874; Mon, 02 Mar 2015 04:18:23 +0000 (GMT) Received: from BLREML408-HUB.china.huawei.com (10.20.4.47) by lhreml406-hub.china.huawei.com (10.201.5.243) with Microsoft SMTP Server (TLS) id 14.3.158.1; Mon, 2 Mar 2015 04:18:23 +0000 Received: from BLREML509-MBX.china.huawei.com ([169.254.7.70]) by BLREML408-HUB.china.huawei.com ([10.20.4.47]) with mapi id 14.03.0158.001; Mon, 2 Mar 2015 09:48:15 +0530 From: Dhruv Dhody To: "pce@ietf.org" Thread-Topic: [Pce] I-D Action: draft-ietf-pce-pcep-service-aware-07.txt Thread-Index: AQHQUmf4ukJHGLlfMECKdJzEk0WSGZ0ImZaw Date: Mon, 2 Mar 2015 04:18:15 +0000 Message-ID: <23CE718903A838468A8B325B80962F9B8704DEF9@BLREML509-MBX.china.huawei.com> References: <20150227083203.10931.12117.idtracker@ietfa.amsl.com> In-Reply-To: <20150227083203.10931.12117.idtracker@ietfa.amsl.com> Accept-Language: en-GB, zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.18.146.248] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Pce] I-D Action: draft-ietf-pce-pcep-service-aware-07.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Mar 2015 04:18:27 -0000 Hi WG, This version does some editorial changes/cleanup and no procedure/functiona= lity has been changed. We feel the document is stable and ready for WG LC. Its companion documents= in OSPF is in AUTH48. Regards, Dhruv (on behalf of authors/contributors) > -----Original Message----- > From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of internet-drafts@ietf= .org > Sent: 27 February 2015 14:02 > To: i-d-announce@ietf.org > Cc: pce@ietf.org > Subject: [Pce] I-D Action: draft-ietf-pce-pcep-service-aware-07.txt >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Path Computation Element Working Group = of > the IETF. >=20 > Title : Extensions to the Path Computation Element > Communication Protocol (PCEP) to compute service aware Label Switched Pat= h > (LSP). > Authors : Dhruv Dhody > Qin Wu > Vishwas Manral > Zafar Ali > Kenji Kumaki > Filename : draft-ietf-pce-pcep-service-aware-07.txt > Pages : 27 > Date : 2015-02-27 >=20 > Abstract: > In certain networks like financial information network (stock/ > commodity trading) and enterprises using cloud based applications, > Latency (delay), Latency Variation (jitter) and Packet Loss are > becoming key requirements for path computation along with other > constraints and metrics. These metrics are associated with the > Service Level Agreement (SLA) between customers and service > providers. The Link Bandwidth Utilization (the total bandwidth of a > link in current use for the forwarding) is another important factor > to consider during path computation. >=20 > IGP Traffic Engineering (TE) Metric extensions describes mechanisms > with which network performance information is distributed via OSPF > and IS-IS respectively. The Path Computation Element Communication > Protocol (PCEP) provides mechanisms for Path Computation Elements > (PCEs) to perform path computations in response to Path Computation > Clients (PCCs) requests. This document describes the extension to > PCEP to carry Latency, Latency Variation, Packet Loss, and Link > Bandwidth Utilization as constraints for end to end path computation. >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-pce-pcep-service-aware/ >=20 > There's also a htmlized version available at: > http://tools.ietf.org/html/draft-ietf-pce-pcep-service-aware-07 >=20 > A diff from the previous version is available at: > http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-pcep-service-aware-07 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce From nobody Tue Mar 3 17:52:32 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C7F4E1A8A8E; Tue, 3 Mar 2015 17:52:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -101.912 X-Spam-Level: X-Spam-Status: No, score=-101.912 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, USER_IN_WHITELIST=-100] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LboJiX2S5kAD; Tue, 3 Mar 2015 17:52:25 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [IPv6:2001:1900:3001:11::31]) by ietfa.amsl.com (Postfix) with ESMTP id B2DB21A8A8D; Tue, 3 Mar 2015 17:52:25 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id 3B09C180204; Tue, 3 Mar 2015 17:51:38 -0800 (PST) To: ietf-announce@ietf.org, rfc-dist@rfc-editor.org X-PHP-Originating-Script: 6000:ams_util_lib.php From: rfc-editor@rfc-editor.org Message-Id: <20150304015138.3B09C180204@rfc-editor.org> Date: Tue, 3 Mar 2015 17:51:38 -0800 (PST) Archived-At: Cc: drafts-update-ref@iana.org, pce@ietf.org, rfc-editor@rfc-editor.org Subject: [Pce] RFC 7470 on Conveying Vendor-Specific Constraints in the Path Computation Element Communication Protocol X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Mar 2015 01:52:28 -0000 A new Request for Comments is now available in online RFC libraries. RFC 7470 Title: Conveying Vendor-Specific Constraints in the Path Computation Element Communication Protocol Author: F. Zhang, A. Farrel Status: Standards Track Stream: IETF Date: March 2015 Mailbox: zhangfatai@huawei.com, adrian@olddog.co.uk Pages: 14 Characters: 28647 Obsoletes: RFC 7150 I-D Tag: draft-ietf-pce-rfc7150bis-01.txt URL: https://www.rfc-editor.org/info/rfc7470 The Path Computation Element Communication Protocol (PCEP) is used to convey path computation requests and responses both between Path Computation Clients (PCCs) and Path Computation Elements (PCEs) and between cooperating PCEs. In PCEP, the path computation requests carry details of the constraints and objective functions that the PCC wishes the PCE to apply in its computation. This document defines a facility to carry vendor-specific information in PCEP using a dedicated object and a new Type-Length-Value (TLV) that can be carried in any PCEP object that supports TLVs. This document obsoletes RFC 7150. The only changes from that document are a clarification of the use of the new Type-Length-Value and the allocation of a different code point for the VENDOR-INFORMATION object. This document is a product of the Path Computation Element Working Group of the IETF. This is now a Proposed Standard. STANDARDS TRACK: This document specifies an Internet Standards Track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the Official Internet Protocol Standards (https://www.rfc-editor.org/standards) for the standardization state and status of this protocol. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/rfc.html Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC From nobody Wed Mar 4 21:46:55 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B2FFB1B29AC; Wed, 4 Mar 2015 21:46:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8aiOr5ZMYOc8; Wed, 4 Mar 2015 21:46:52 -0800 (PST) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A3911A026A; Wed, 4 Mar 2015 21:46:52 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 5.12.0.p2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20150305054652.24609.3174.idtracker@ietfa.amsl.com> Date: Wed, 04 Mar 2015 21:46:52 -0800 Archived-At: Cc: pce@ietf.org Subject: [Pce] I-D Action: draft-ietf-pce-pceps-03.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2015 05:46:53 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path Computation Element Working Group of the IETF. Title : Secure Transport for PCEP Authors : Diego R. Lopez Oscar Gonzalez de Dios Qin Wu Dhruv Dhody Filename : draft-ietf-pce-pceps-03.txt Pages : 15 Date : 2015-03-04 Abstract: The Path Computation Element Communication Protocol (PCEP) defines the mechanisms for the communication between a Path Computation Client (PCC) and a Path Computation Element (PCE), or among PCEs. This document describe the usage of Transport Layer Security (TLS) to enhance PCEP security, hence the PCEPS acronym proposed for it. The additional security mechanisms are provided by the transport protocol supporting PCEP, and therefore they do not affect the flexibility and extensibility of PCEP. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-pceps/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-pce-pceps-03 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-ietf-pce-pceps-03 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Wed Mar 4 21:52:00 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DB9591B29BC for ; Wed, 4 Mar 2015 21:51:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.211 X-Spam-Level: X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4TLBtYYkeCNM for ; Wed, 4 Mar 2015 21:51:58 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 25E2B1AD366 for ; Wed, 4 Mar 2015 21:51:58 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml406-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BPX22028; Thu, 05 Mar 2015 05:51:56 +0000 (GMT) Received: from BLREML407-HUB.china.huawei.com (10.20.4.45) by lhreml406-hub.china.huawei.com (10.201.5.243) with Microsoft SMTP Server (TLS) id 14.3.158.1; Thu, 5 Mar 2015 05:51:55 +0000 Received: from BLREML509-MBX.china.huawei.com ([169.254.7.70]) by BLREML407-HUB.china.huawei.com ([10.20.4.45]) with mapi id 14.03.0158.001; Thu, 5 Mar 2015 11:21:48 +0530 From: Dhruv Dhody To: "pce@ietf.org" Thread-Topic: [Pce] I-D Action: draft-ietf-pce-pceps-03.txt Thread-Index: AQHQVwfN1s9CjE3/zE2Sz+8G2DHTlJ0NYhjw Date: Thu, 5 Mar 2015 05:51:47 +0000 Message-ID: <23CE718903A838468A8B325B80962F9B87051627@BLREML509-MBX.china.huawei.com> References: <20150305054652.24609.3174.idtracker@ietfa.amsl.com> In-Reply-To: <20150305054652.24609.3174.idtracker@ietfa.amsl.com> Accept-Language: en-GB, zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.18.146.248] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Pce] I-D Action: draft-ietf-pce-pceps-03.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2015 05:52:00 -0000 Hi WG, The authors have taken another editorial pass at the document, no procedure= /functionality has been changed in this update.=20 We feel the document is stable and ready for WG LC.=20 Regards, Dhruv (on behalf of authors) > -----Original Message----- > From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of internet-drafts@ietf= .org > Sent: 05 March 2015 11:17 > To: i-d-announce@ietf.org > Cc: pce@ietf.org > Subject: [Pce] I-D Action: draft-ietf-pce-pceps-03.txt >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Path Computation Element Working Group = of > the IETF. >=20 > Title : Secure Transport for PCEP > Authors : Diego R. Lopez > Oscar Gonzalez de Dios > Qin Wu > Dhruv Dhody > Filename : draft-ietf-pce-pceps-03.txt > Pages : 15 > Date : 2015-03-04 >=20 > Abstract: > The Path Computation Element Communication Protocol (PCEP) defines > the mechanisms for the communication between a Path Computation > Client (PCC) and a Path Computation Element (PCE), or among PCEs. > This document describe the usage of Transport Layer Security (TLS) to > enhance PCEP security, hence the PCEPS acronym proposed for it. The > additional security mechanisms are provided by the transport protocol > supporting PCEP, and therefore they do not affect the flexibility and > extensibility of PCEP. >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-pce-pceps/ >=20 > There's also a htmlized version available at: > http://tools.ietf.org/html/draft-ietf-pce-pceps-03 >=20 > A diff from the previous version is available at: > http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-pceps-03 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce From nobody Wed Mar 4 23:00:41 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F0F131B29F0 for ; Wed, 4 Mar 2015 23:00:38 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.21 X-Spam-Level: X-Spam-Status: No, score=-4.21 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UEvEm87nRx2O for ; Wed, 4 Mar 2015 23:00:34 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2FD801B29E6 for ; Wed, 4 Mar 2015 23:00:34 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml404-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BPX27254; Thu, 05 Mar 2015 07:00:31 +0000 (GMT) Received: from BLREML406-HUB.china.huawei.com (10.20.4.43) by lhreml404-hub.china.huawei.com (10.201.5.218) with Microsoft SMTP Server (TLS) id 14.3.158.1; Thu, 5 Mar 2015 06:58:58 +0000 Received: from BLREML509-MBX.china.huawei.com ([169.254.7.70]) by BLREML406-HUB.china.huawei.com ([10.20.4.43]) with mapi id 14.03.0158.001; Thu, 5 Mar 2015 12:28:46 +0530 From: Dhruv Dhody To: "BELOTTI, SERGIO (SERGIO)" Thread-Topic: draft-lee-pce-transporting-te-data-01.txt draft-dhodylee-pce-pcep-te-data-extn-01, Thread-Index: AdAGO8r02qu9C/SyR72eG5Jk/UcPCRQzvX+g Date: Thu, 5 Mar 2015 06:58:45 +0000 Message-ID: <23CE718903A838468A8B325B80962F9B870516B7@BLREML509-MBX.china.huawei.com> References: In-Reply-To: Accept-Language: en-GB, zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.18.146.248] Content-Type: multipart/alternative; boundary="_000_23CE718903A838468A8B325B80962F9B870516B7BLREML509MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: "pce@ietf.org" Subject: Re: [Pce] draft-lee-pce-transporting-te-data-01.txt draft-dhodylee-pce-pcep-te-data-extn-01, X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Mar 2015 07:00:39 -0000 --_000_23CE718903A838468A8B325B80962F9B870516B7BLREML509MBXchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Sergio, [Adding WG in CC list] Thanks for your mail, see inline... From: BELOTTI, SERGIO (SERGIO) [mailto:sergio.belotti@alcatel-lucent.com] To: Leeyoung; Dhruv Dhody; Daniele Ceccarelli Cc: BELOTTI, SERGIO (SERGIO) Subject: draft-lee-pce-transporting-te-data-01.txt draft-dhodylee-pce-pcep-= te-data-extn-01, Hi Young, Druhv, Daniele as promised I have some comments/clarifications to send after the meeting i= n Honolulu. In general , as I've already said to Young after presentation, I consider t= he intention to find alternative method to IGP listening to feed TE topolog= y information into PCE a very important issue and the drafts are very usefu= l . Going into the drafts specifically , about the first draft-lee-pce-transpor= ting-te-data-01.txt : 1) In the second architecture option is considered as possible interme= diate entity an NMS ? NMS can simple retrieve topology by usual p2p request= to nodes. [Dhruv]: The document does not make any assumption on the intermediate syst= em that implements the pub/sub paradigm; BUT IMHO I don't see intermediate = entity as an NMS, I see it more like a special PCE with pub/sub functionali= ty (like RR in case of BGP). 2) In the third architecture , PCEs to share information among the oth= er PCEs in the domain need to have routing protocol . this does not permit = to have a simplified implementation of PCE (since it does not need to "list= en" from network nodes no routing instance on board) . Is it correct my fee= ling? [Dhruv]: For PCE that share TED information to other PCEs, it can use the s= ame PCEP TED population mechanism that is used by the node (PCC) to PCE. Th= us the PCEP extn should be extensible to handle PCE-PCE TED exchange. We do= not want the dependence on the routing protocol. For the draft-dhodylee-pce-pcep-te-data-extn-01 : * In 9.2.4 TE Node Descriptor Sub-TLVs is said at the last bullet "= There can be at most one instance of each sub-TLV type present in any Node = Descriptor". But what does it mean : e.g. if one does not implement BGP-LS= why you would need to put this type of sub-tlv? Or there is a specific val= ue to put in case you don't' use the sub-TLV? [Dhruv]: The statement means that you should not repeat the same sub-TLV tw= ice. All SUB-TLV are not mandatory, that is, you should include the sub-TLV= only if needed; so BGP-LS sub-tlv should be added only if the node impleme= nts BGP-LS. I can update text to reflect that. * 9.2.5 : the chapter report a table with only specific column for= IS-IS , and relative value defined for the sub-tlv. What about if you do n= ot use IS-IS . Moreover the last part of the paragraph talked about the in= formation present in the LSA/LSP originated by local node, and these inform= ation determine the set of sub-TLvs in the link. But what is the relationsh= ip with the just above table? Are there other not mentioned sub-TLVs to inc= lude? Not totally clear what information is referring to. [Dhruv]: PCEP will get its own code points, those are in column 1 with TBD;= the IS-IS column is to let the reader find the corresponding already-defin= ed-TLV, since we do not want to repeat the format and fields of each of the= TLV again in this document. Similar principle is followed by BGP-LS. This = does not mean the implementation must have IS-IS enabled to use this extens= ion. * 9.2.6: Why again a sub-TLV specific for IS-IS ? Moreover even if = the draft does not mandate any particular choice of routing protocol, is co= ntinuosly referring to BGP-LS , like a translation of BGP-LS sub-TLV into P= CEP. [Dhruv]: see above. * 9.2.7 : is this TLV optional as for the Node Attributes TLV? If y= es this would be explicitly said. In the table the is only mention of value= s referred to IS-IS or BGP-LS, what about OSPF-TE? [Dhruv]:We are refereeing to IS-IS and BGP-LS for the TLV format, it has no= dependency on the actual protocol. Since the TLV format is the same there = is no reason to also mention OSPF here. Following text in the document stat= es this - The format and semantics of the 'value' fields in most 'Link Descriptor' sub-TLVs correspond to the format and semantics of value fields in IS-IS Extended IS Reachability sub-TLVs, defined in [RFC5305], [RFC5307] and [RFC6119]. Although the encodings for 'Link Descriptor' TLVs were originally defined for IS-IS, the TLVs can carry data sourced either by IS-IS or OSPF or direct. We have also updated the extension document, see - http://www.ietf.org/id/d= raft-dhodylee-pce-pcep-te-data-extn-02.txt Regards, Dhruv Thanks in advance for any clarifications you would provide . Sergio --_000_23CE718903A838468A8B325B80962F9B870516B7BLREML509MBXchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Sergio,

 

[Adding WG in CC list]

 

Thanks for your mail, see inline…

 

From: BELOTTI,= SERGIO (SERGIO) [mailto:sergio.belotti@alcatel-lucent.com]
To: Leeyoung; Dhruv Dhody; Daniele Ceccarelli
Cc: BELOTTI, SERGIO (SERGIO)
Subject: draft-lee-pce-transporting-te-data-01.txt draft-dhodylee-pc= e-pcep-te-data-extn-01,

 

Hi Young, Druhv, Daniele

 

as promised I have some comments/clarifications to s= end after the meeting in Honolulu.

In general , as I’ve already said to Young aft= er presentation, I consider the intention to find alternative method to IGP= listening to feed TE topology information into PCE a very important issue = and the drafts are very useful .

Going into the drafts specifically , about the first= draft-lee-pce-transporting-te-data-01.txt  :

 

1)      In the second architecture option is considered as = possible intermediate entity an NMS ? NMS can simple retrieve topology by u= sual p2p request to nodes.

[Dhruv]: The document does not make any as= sumption on the intermediate system that implements the pub/sub paradigm; B= UT IMHO I don’t see intermediate entity as an NMS, I see it more like a special PCE with pub/sub functionality (like RR in case of = BGP).

2)      In the third architecture , PCEs to share informati= on among the other PCEs in the domain need to have routing protocol . this = does not permit to have a simplified implementation of PCE (since it does n= ot need to “listen” from network nodes no routing instance on board) . Is it correct my feeling?  

[Dhruv]: For PCE that share TED informatio= n to other PCEs, it can use the same PCEP TED population mechanism that is = used by the node (PCC) to PCE. Thus the PCEP extn should be extensible to handle PCE-PCE TED exchange. We do not want the dependenc= e on the routing protocol.

 

For the draft-dhodylee-pce-pcep-te-data-extn-01 :

·         In 9.2.4 TE Node Descriptor Sub= -TLVs is said at the last bullet “There can be at most one instance o= f each sub-TLV type present in any Node Descriptor”. But what does it mean : e.g. if one does not implement  BGP-LS why you would n= eed to put this type of sub-tlv? Or there is a specific value to put in cas= e you don’t’ use the sub-TLV?

[Dhruv]: The statement= means that you should not repeat the same sub-TLV twice. All SUB-TLV are n= ot mandatory, that is, you should include the sub-TLV only if needed; so BGP-LS sub-tlv should be added only if the node implements B= GP-LS. I can update text to reflect that.

·         9.2.5 : the chapter report = ; a table with only specific column for IS-IS , and relative value defined = for the sub-tlv. What about if you do not use IS-IS . Moreover the last part  of the paragraph talked about the information present = in the LSA/LSP originated by local node, and these information determine th= e set of sub-TLvs in the link. But what is the relationship with the just a= bove table? Are there other not mentioned sub-TLVs to include? Not totally clear what information is referring to. <= o:p>

[Dhruv]: PCEP will get= its own code points, those are in column 1 with TBD; the IS-IS column is t= o let the reader find the corresponding already-defined-TLV, since we do not want to repeat the format and fields of each of the TLV ag= ain in this document. Similar principle is followed by BGP-LS. This does no= t mean the implementation must have IS-IS enabled to use this extension.

·         9.2.6: Why again a sub-TLV spec= ific for IS-IS ? Moreover even if the draft does not mandate any particular= choice of routing protocol, is continuosly referring to BGP-LS , like a translation of BGP-LS sub-TLV into PCEP.

[Dhruv]: see above.

·         9.2.7 : is this TLV optional as= for the Node Attributes TLV? If yes this would be explicitly said. In the = table the is only mention of values referred to IS-IS or BGP-LS, what about OSPF-TE?

[Dhruv]:We are refereeing to IS-IS and BGP= -LS for the TLV format, it has no dependency on the actual protocol. Since = the TLV format is the same there is no reason to also mention OSPF here. Following text in the document states this – <= /span>

The format and semantics of t= he 'value' fields in most 'Link

   Descriptor' sub-= TLVs correspond to the format and semantics of value

   fields in IS-IS = Extended IS Reachability sub-TLVs, defined in

   [RFC5305], [RFC5= 307] and [RFC6119].  Although the encodings for 'Link

   Descriptor' TLVs= were originally defined for IS-IS, the TLVs can

   carry data sourc= ed either by IS-IS or OSPF or direct.

 

We have also updated the extension documen= t, see - http://www.ietf.org/id/draft-dhodylee-pce-pcep-te-data-extn-02.txt<= o:p>

 

Regards,

Dhruv

 

Thanks in advance for any clarifications you would p= rovide .

 

Sergio

 

 

 

--_000_23CE718903A838468A8B325B80962F9B870516B7BLREML509MBXchi_-- From nobody Thu Mar 5 17:31:31 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 96F681A90A9; Thu, 5 Mar 2015 17:31:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id n7ZSHMhJPwEm; Thu, 5 Mar 2015 17:31:27 -0800 (PST) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 4AF231A88BA; Thu, 5 Mar 2015 17:31:27 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 5.12.0.p2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20150306013127.7175.22492.idtracker@ietfa.amsl.com> Date: Thu, 05 Mar 2015 17:31:27 -0800 Archived-At: Cc: pce@ietf.org Subject: [Pce] I-D Action: draft-ietf-pce-pce-initiated-lsp-03.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2015 01:31:28 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path Computation Element Working Group of the IETF. Title : PCEP Extensions for PCE-initiated LSP Setup in a Stateful PCE Model Authors : Edward Crabbe Ina Minei Siva Sivabalan Robert Varga Filename : draft-ietf-pce-pce-initiated-lsp-03.txt Pages : 16 Date : 2015-03-05 Abstract: The Path Computation Element Communication Protocol (PCEP) provides mechanisms for Path Computation Elements (PCEs) to perform path computations in response to Path Computation Clients (PCCs) requests. The extensions for stateful PCE provide stateful control of Multiprotocol Label Switching (MPLS) Traffic Engineering Label Switched Paths (TE LSP) via PCEP, for a model where the PCC delegates control over one or more locally configured LSPs to the PCE. This document describes the creation and deletion of PCE-initiated LSPs under the stateful PCE model. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-pce-initiated-lsp/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-pce-pce-initiated-lsp-03 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-ietf-pce-pce-initiated-lsp-03 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu Mar 5 17:44:48 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BFB011A9091 for ; Thu, 5 Mar 2015 17:44:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.211 X-Spam-Level: X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eztLHRzpRNlq for ; Thu, 5 Mar 2015 17:44:46 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8F9211A9074 for ; Thu, 5 Mar 2015 17:44:45 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml406-hub.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BTI27276; Fri, 06 Mar 2015 01:44:43 +0000 (GMT) Received: from NKGEML406-HUB.china.huawei.com (10.98.56.37) by lhreml406-hub.china.huawei.com (10.201.5.243) with Microsoft SMTP Server (TLS) id 14.3.158.1; Fri, 6 Mar 2015 01:44:43 +0000 Received: from NKGEML512-MBX.china.huawei.com ([169.254.7.106]) by nkgeml406-hub.china.huawei.com ([10.98.56.37]) with mapi id 14.03.0158.001; Fri, 6 Mar 2015 09:44:38 +0800 From: "Dongjie (Jimmy)" To: "pce@ietf.org" Thread-Topic: I-D Action: draft-dong-pce-discovery-proto-bgp-02.txt Thread-Index: AQHQVxZ0vQWr6qe66kWxBvE6XtmDhp0OrjLA Date: Fri, 6 Mar 2015 01:44:38 +0000 Message-ID: <76CD132C3ADEF848BD84D028D243C9273384DE3D@nkgeml512-mbx.china.huawei.com> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.97.131] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Pce] FW: I-D Action: draft-dong-pce-discovery-proto-bgp-02.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2015 01:44:47 -0000 RGVhciBhbGwsDQoNCkhlcmUgaXMgYSBuZXcgcmV2aXNpb24gb2YgZHJhZnQtZG9uZy1wY2UtZGlz Y292ZXJ5LXByb3RvLWJncC4NCg0KQ2hhbmdlcyBpbiB0aGlzIHZlcnNpb24gYXJlOg0KDQotIFJl b3JnYW5pemUgdGhlIHNjZW5hcmlvcyBpbiB3aGljaCB0aGUgSUdQIGJhc2VkIGRpc2NvdmVyeSB3 b3VsZCBub3Qgd29yay4NCi0gRWRpdG9yaWFsIGNoYW5nZXMuDQoNCllvdXIgY29tbWVudHMgYXJl IGFsd2F5cyBhcHByZWNpYXRlZC4NCg0KQmVzdCByZWdhcmRzLA0KSmllDQoNCj4gLS0tLS1Pcmln aW5hbCBNZXNzYWdlLS0tLS0NCj4gRnJvbTogaW50ZXJuZXQtZHJhZnRzQGlldGYub3JnIFttYWls dG86aW50ZXJuZXQtZHJhZnRzQGlldGYub3JnXQ0KPiBTZW50OiBUaHVyc2RheSwgTWFyY2ggMDUs IDIwMTUgMzoxNiBQTQ0KPiBUbzogaS1kLWFubm91bmNlQGlldGYub3JnDQo+IFN1YmplY3Q6IEkt RCBBY3Rpb246IGRyYWZ0LWRvbmctcGNlLWRpc2NvdmVyeS1wcm90by1iZ3AtMDIudHh0DQo+IA0K PiANCj4gQSBOZXcgSW50ZXJuZXQtRHJhZnQgaXMgYXZhaWxhYmxlIGZyb20gdGhlIG9uLWxpbmUg SW50ZXJuZXQtRHJhZnRzIGRpcmVjdG9yaWVzLg0KPiANCj4gDQo+ICAgICAgICAgVGl0bGUgICAg ICAgICAgIDogQkdQIEV4dGVuc2lvbnMgZm9yIFBhdGggQ29tcHV0YXRpb24gRWxlbWVudA0KPiAo UENFKSBEaXNjb3ZlcnkNCj4gICAgICAgICBBdXRob3JzICAgICAgICAgOiBKaWUgRG9uZw0KPiAg ICAgICAgICAgICAgICAgICAgICAgICAgIE1hY2goR3VveWkpIENoZW4NCj4gICAgICAgICAgICAg ICAgICAgICAgICAgICBEaHJ1diBEaG9keQ0KPiAgICAgICAgICAgICAgICAgICAgICAgICAgIEpl ZmYgVGFudHN1cmENCj4gCUZpbGVuYW1lICAgICAgICA6IGRyYWZ0LWRvbmctcGNlLWRpc2NvdmVy eS1wcm90by1iZ3AtMDIudHh0DQo+IAlQYWdlcyAgICAgICAgICAgOiA5DQo+IAlEYXRlICAgICAg ICAgICAgOiAyMDE1LTAzLTA0DQo+IA0KPiBBYnN0cmFjdDoNCj4gICAgSW4gbmV0d29ya3Mgd2hl cmUgUGF0aCBDb21wdXRhdGlvbiBFbGVtZW50IChQQ0UpIGlzIHVzZWQgZm9yDQo+ICAgIGNlbnRy YWxpemVkIHBhdGggY29tcHV0YXRpb24sIGl0IGlzIGRlc2lyYWJsZSBmb3IgUGF0aCBDb21wdXRh dGlvbg0KPiAgICBDbGllbnRzIChQQ0NzKSB0byBhdXRvbWF0aWNhbGx5IGRpc2NvdmVyIGEgc2V0 IG9mIFBDRXMgYW5kIHNlbGVjdCB0aGUNCj4gICAgc3VpdGFibGUgb25lcyB0byBlc3RhYmxpc2gg dGhlIFBDRVAgc2Vzc2lvbi4gIFJGQyA1MDg4IGFuZCBSRkMgNTA4OQ0KPiAgICBkZWZpbmUgdGhl IFBDRSBkaXNjb3ZlcnkgbWVjaGFuaXNtcyBiYXNlZCBvbiBJbnRlcmlvciBHYXRld2F5DQo+ICAg IFByb3RvY29scyAoSUdQKS4gIFRoaXMgZG9jdW1lbnQgZGVzY3JpYmVzIHNldmVyYWwgc2NlbmFy aW9zIGluIHdoaWNoDQo+ICAgIHRoZSBJR1AgYmFzZWQgUENFIGRpc2NvdmVyeSBtZWNoYW5pc21z IGNhbm5vdCBiZSB1c2VkIGRpcmVjdGx5LiAgVGhpcw0KPiAgICBkb2N1bWVudCBzcGVjaWZpZXMg dGhlIEJHUCBleHRlbnNpb25zIGZvciBQQ0UgZGlzY292ZXJ5IGluIHRoZXNlDQo+ICAgIHNjZW5h cmlvcy4gIFRoZSBCR1AgYmFzZWQgUENFIGRpc2NvdmVyeSBtZWNoYW5pc20gaXMgY29tcGxlbWVu dGFyeSB0bw0KPiAgICB0aGUgZXhpc3RpbmcgSUdQIGJhc2VkIG1lY2hhbmlzbXMuDQo+IA0KPiAN Cj4gDQo+IFRoZSBJRVRGIGRhdGF0cmFja2VyIHN0YXR1cyBwYWdlIGZvciB0aGlzIGRyYWZ0IGlz Og0KPiBodHRwczovL2RhdGF0cmFja2VyLmlldGYub3JnL2RvYy9kcmFmdC1kb25nLXBjZS1kaXNj b3ZlcnktcHJvdG8tYmdwLw0KPiANCj4gVGhlcmUncyBhbHNvIGEgaHRtbGl6ZWQgdmVyc2lvbiBh dmFpbGFibGUgYXQ6DQo+IGh0dHA6Ly90b29scy5pZXRmLm9yZy9odG1sL2RyYWZ0LWRvbmctcGNl LWRpc2NvdmVyeS1wcm90by1iZ3AtMDINCj4gDQo+IEEgZGlmZiBmcm9tIHRoZSBwcmV2aW91cyB2 ZXJzaW9uIGlzIGF2YWlsYWJsZSBhdDoNCj4gaHR0cDovL3d3dy5pZXRmLm9yZy9yZmNkaWZmP3Vy bDI9ZHJhZnQtZG9uZy1wY2UtZGlzY292ZXJ5LXByb3RvLWJncC0wMg0KPiANCj4gDQo+IFBsZWFz ZSBub3RlIHRoYXQgaXQgbWF5IHRha2UgYSBjb3VwbGUgb2YgbWludXRlcyBmcm9tIHRoZSB0aW1l IG9mIHN1Ym1pc3Npb24NCj4gdW50aWwgdGhlIGh0bWxpemVkIHZlcnNpb24gYW5kIGRpZmYgYXJl IGF2YWlsYWJsZSBhdCB0b29scy5pZXRmLm9yZy4NCj4gDQo+IEludGVybmV0LURyYWZ0cyBhcmUg YWxzbyBhdmFpbGFibGUgYnkgYW5vbnltb3VzIEZUUCBhdDoNCj4gZnRwOi8vZnRwLmlldGYub3Jn L2ludGVybmV0LWRyYWZ0cy8NCj4gDQoNCg== From nobody Fri Mar 6 00:45:35 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 54EB11A0338 for ; Fri, 6 Mar 2015 00:45:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sveszAGobNwL for ; Fri, 6 Mar 2015 00:45:32 -0800 (PST) Received: from relais-inet.francetelecom.com (relais-ias92.francetelecom.com [193.251.215.92]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F049D1A005B for ; Fri, 6 Mar 2015 00:45:31 -0800 (PST) Received: from omfedm08.si.francetelecom.fr (unknown [xx.xx.xx.4]) by omfedm14.si.francetelecom.fr (ESMTP service) with ESMTP id 4C17E22C88C for ; Fri, 6 Mar 2015 09:45:30 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.183]) by omfedm08.si.francetelecom.fr (ESMTP service) with ESMTP id 304D42380AF for ; Fri, 6 Mar 2015 09:45:30 +0100 (CET) Received: from [10.193.71.188] (10.197.38.2) by PEXCVZYH02.corporate.adroot.infra.ftgroup (10.114.1.183) with Microsoft SMTP Server (TLS) id 14.3.224.2; Fri, 6 Mar 2015 09:45:29 +0100 Message-ID: <11543_1425631530_54F9692A_11543_12033_1_54F96929.2040403@orange.com> Date: Fri, 6 Mar 2015 09:45:29 +0100 From: Organization: Orange User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: References: <30282_1421063031_54B3B377_30282_3283_1_54B3B377.3060306@orange.com> In-Reply-To: <30282_1421063031_54B3B377_30282_3283_1_54B3B377.3060306@orange.com> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.197.38.2] X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.3.6.75721 Archived-At: Subject: Re: [Pce] Poll on draft-dhody-pce-iro-update-02 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2015 08:45:33 -0000 Hi all. Considering both the supporting feedback about the associated survey and the absence of objection, we can proceed with this resulting I-D. Authors, please publish the same document as draft-ietf-pce-iro-update-00 Thanks, JP & Julien Jan. 12, 2015 - julien.meuric@orange.com: > Dear PCE WG, > > Following our previous discussions on IRO within PCEP, do you agree > with the adoption of draft-dhody-pce-iro-update-02 as a PCE WG I-D? > Please share your comments using the mailing list, justifying as much > as possible in case you are opposed. > > Thanks, > > JP & Julien > _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. 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From nobody Fri Mar 6 05:26:33 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 331501ACE0F; Fri, 6 Mar 2015 05:26:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uuaWx2to5GSD; Fri, 6 Mar 2015 05:26:30 -0800 (PST) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B33EB1ACE0A; Fri, 6 Mar 2015 05:26:30 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 5.12.0.p2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20150306132630.19807.28972.idtracker@ietfa.amsl.com> Date: Fri, 06 Mar 2015 05:26:30 -0800 Archived-At: Cc: pce@ietf.org Subject: [Pce] I-D Action: draft-ietf-pce-iro-update-00.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2015 13:26:32 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path Computation Element Working Group of the IETF. Title : Update to Include Route Object (IRO) specification in Path Computation Element communication Protocol (PCEP) Author : Dhruv Dhody Filename : draft-ietf-pce-iro-update-00.txt Pages : 6 Date : 2015-03-06 Abstract: During discussions of a document to provide a standard representation and encoding of Domain-Sequence within the Path Computation Element (PCE) communication Protocol (PCEP) for communications between a Path Computation Client (PCC) and a PCE, or between two PCEs. It was determined that there was a need for clarification with respect to the ordered nature of the Include Route Object (IRO). An informal survey was conducted to determine the state of current and planned implementation with respect to IRO ordering and handling of Loose bit (L bit). This document updates the IRO specification based on the survey conclusion and recommendation. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-iro-update/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-pce-iro-update-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Fri Mar 6 05:44:45 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F03151ACE14; Fri, 6 Mar 2015 05:44:42 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dE_MTeiAN0Oy; Fri, 6 Mar 2015 05:44:41 -0800 (PST) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B6FBD1ACDF2; Fri, 6 Mar 2015 05:44:41 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 5.12.0.p2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20150306134441.869.51686.idtracker@ietfa.amsl.com> Date: Fri, 06 Mar 2015 05:44:41 -0800 Archived-At: Cc: pce@ietf.org Subject: [Pce] I-D Action: draft-ietf-pce-iro-update-01.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2015 13:44:43 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path Computation Element Working Group of the IETF. Title : Update to Include Route Object (IRO) specification in Path Computation Element communication Protocol (PCEP) Author : Dhruv Dhody Filename : draft-ietf-pce-iro-update-01.txt Pages : 6 Date : 2015-03-06 Abstract: During discussions of a document to provide a standard representation and encoding of Domain-Sequence within the Path Computation Element (PCE) communication Protocol (PCEP) for communications between a Path Computation Client (PCC) and a PCE, or between two PCEs. It was determined that there was a need for clarification with respect to the ordered nature of the Include Route Object (IRO). An informal survey was conducted to determine the state of current and planned implementation with respect to IRO ordering and handling of Loose bit (L bit). This document updates the IRO specification based on the survey conclusion and recommendation. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-iro-update/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-pce-iro-update-01 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-ietf-pce-iro-update-01 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Fri Mar 6 15:40:15 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 64B341A8730 for ; Fri, 6 Mar 2015 15:40:13 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.209 X-Spam-Level: X-Spam-Status: No, score=-3.209 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eL7xRX7H7dqD for ; Fri, 6 Mar 2015 15:40:08 -0800 (PST) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5A7E31A870D for ; Fri, 6 Mar 2015 15:40:07 -0800 (PST) Received: from 172.18.7.190 (EHLO lhreml402-hub.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BTJ16021; Fri, 06 Mar 2015 23:40:05 +0000 (GMT) Received: from DFWEML703-CHM.china.huawei.com (10.193.5.130) by lhreml402-hub.china.huawei.com (10.201.5.241) with Microsoft SMTP Server (TLS) id 14.3.158.1; Fri, 6 Mar 2015 23:40:04 +0000 Received: from DFWEML706-CHM.china.huawei.com ([10.193.5.225]) by dfweml703-chm ([10.193.5.130]) with mapi id 14.03.0158.001; Fri, 6 Mar 2015 15:39:49 -0800 From: Leeyoung To: "pce@ietf.org" Thread-Topic: draft-dhodylee-pce-pcep-te-data-extn-02, Thread-Index: AQHQWGbVMUE69RCgqk63BH7LqR7eDw== Date: Fri, 6 Mar 2015 23:39:49 +0000 Message-ID: <7AEB3D6833318045B4AE71C2C87E8E1729C94D48@dfweml706-chm> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-cr-hashedpuzzle: 1eY= BVqa CCDl CEs0 CPzS CXl3 DAX0 DWEu Dffy DuKM FV+p FtvB GoLe JNz7 J9Xf KLs3; 1; cABjAGUAQABpAGUAdABmAC4AbwByAGcA; Sosha1_v1; 7; {B3D36FDA-AA12-4D58-8AFD-8E231C031289}; bABlAGUAeQBvAHUAbgBnAEAAaAB1AGEAdwBlAGkALgBjAG8AbQA=; Fri, 06 Mar 2015 23:39:44 GMT; ZAByAGEAZgB0AC0AZABoAG8AZAB5AGwAZQBlAC0AcABjAGUALQBwAGMAZQBwAC0AdABlAC0AZABhAHQAYQAtAGUAeAB0AG4ALQAwADIALAA= x-cr-puzzleid: {B3D36FDA-AA12-4D58-8AFD-8E231C031289} x-originating-ip: [10.192.11.119] Content-Type: multipart/alternative; boundary="_000_7AEB3D6833318045B4AE71C2C87E8E1729C94D48dfweml706chm_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Pce] draft-dhodylee-pce-pcep-te-data-extn-02, X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Mar 2015 23:40:13 -0000 --_000_7AEB3D6833318045B4AE71C2C87E8E1729C94D48dfweml706chm_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, We have updated this draft. Here's new version pointer. http://datatracker.ietf.org/doc/draft-dhodylee-pce-pcep-te-data-extn/ Major changes are: - Security and Manageability sections enhancement - Make this experimental track from a standard track. In the last meeting, quite a few were interested in this draft, but there w= as also some objection for this work to move on. As we are proposing this work to be an experimental draft, we hope objectio= n would be lifted. Thanks, Young & Dhruv From: Dhruv Dhody Sent: Thursday, March 05, 2015 12:59 AM To: BELOTTI, SERGIO (SERGIO) Cc: Dhruv Dhody; pce@ietf.org; Leeyoung; Daniele Ceccarelli Subject: RE: draft-lee-pce-transporting-te-data-01.txt draft-dhodylee-pce-p= cep-te-data-extn-01, Hi Sergio, [Adding WG in CC list] Thanks for your mail, see inline... From: BELOTTI, SERGIO (SERGIO) [mailto:sergio.belotti@alcatel-lucent.com] To: Leeyoung; Dhruv Dhody; Daniele Ceccarelli Cc: BELOTTI, SERGIO (SERGIO) Subject: draft-lee-pce-transporting-te-data-01.txt draft-dhodylee-pce-pcep-= te-data-extn-01, Hi Young, Druhv, Daniele as promised I have some comments/clarifications to send after the meeting i= n Honolulu. In general , as I've already said to Young after presentation, I consider t= he intention to find alternative method to IGP listening to feed TE topolog= y information into PCE a very important issue and the drafts are very usefu= l . Going into the drafts specifically , about the first draft-lee-pce-transpor= ting-te-data-01.txt : 1) In the second architecture option is considered as possible interme= diate entity an NMS ? NMS can simple retrieve topology by usual p2p request= to nodes. [Dhruv]: The document does not make any assumption on the intermediate syst= em that implements the pub/sub paradigm; BUT IMHO I don't see intermediate = entity as an NMS, I see it more like a special PCE with pub/sub functionali= ty (like RR in case of BGP). 2) In the third architecture , PCEs to share information among the oth= er PCEs in the domain need to have routing protocol . this does not permit = to have a simplified implementation of PCE (since it does not need to "list= en" from network nodes no routing instance on board) . Is it correct my fee= ling? [Dhruv]: For PCE that share TED information to other PCEs, it can use the s= ame PCEP TED population mechanism that is used by the node (PCC) to PCE. Th= us the PCEP extn should be extensible to handle PCE-PCE TED exchange. We do= not want the dependence on the routing protocol. For the draft-dhodylee-pce-pcep-te-data-extn-01 : * In 9.2.4 TE Node Descriptor Sub-TLVs is said at the last bullet "= There can be at most one instance of each sub-TLV type present in any Node = Descriptor". But what does it mean : e.g. if one does not implement BGP-LS= why you would need to put this type of sub-tlv? Or there is a specific val= ue to put in case you don't' use the sub-TLV? [Dhruv]: The statement means that you should not repeat the same sub-TLV tw= ice. All SUB-TLV are not mandatory, that is, you should include the sub-TLV= only if needed; so BGP-LS sub-tlv should be added only if the node impleme= nts BGP-LS. I can update text to reflect that. * 9.2.5 : the chapter report a table with only specific column for= IS-IS , and relative value defined for the sub-tlv. What about if you do n= ot use IS-IS . Moreover the last part of the paragraph talked about the in= formation present in the LSA/LSP originated by local node, and these inform= ation determine the set of sub-TLvs in the link. But what is the relationsh= ip with the just above table? Are there other not mentioned sub-TLVs to inc= lude? Not totally clear what information is referring to. [Dhruv]: PCEP will get its own code points, those are in column 1 with TBD;= the IS-IS column is to let the reader find the corresponding already-defin= ed-TLV, since we do not want to repeat the format and fields of each of the= TLV again in this document. Similar principle is followed by BGP-LS. This = does not mean the implementation must have IS-IS enabled to use this extens= ion. * 9.2.6: Why again a sub-TLV specific for IS-IS ? Moreover even if = the draft does not mandate any particular choice of routing protocol, is co= ntinuosly referring to BGP-LS , like a translation of BGP-LS sub-TLV into P= CEP. [Dhruv]: see above. * 9.2.7 : is this TLV optional as for the Node Attributes TLV? If y= es this would be explicitly said. In the table the is only mention of value= s referred to IS-IS or BGP-LS, what about OSPF-TE? [Dhruv]:We are refereeing to IS-IS and BGP-LS for the TLV format, it has no= dependency on the actual protocol. Since the TLV format is the same there = is no reason to also mention OSPF here. Following text in the document stat= es this - The format and semantics of the 'value' fields in most 'Link Descriptor' sub-TLVs correspond to the format and semantics of value fields in IS-IS Extended IS Reachability sub-TLVs, defined in [RFC5305], [RFC5307] and [RFC6119]. Although the encodings for 'Link Descriptor' TLVs were originally defined for IS-IS, the TLVs can carry data sourced either by IS-IS or OSPF or direct. We have also updated the extension document, see - http://www.ietf.org/id/d= raft-dhodylee-pce-pcep-te-data-extn-02.txt Regards, Dhruv Thanks in advance for any clarifications you would provide . Sergio --_000_7AEB3D6833318045B4AE71C2C87E8E1729C94D48dfweml706chm_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

 

We have updated this d= raft. Here’s new version pointer.

 

http://datatrac= ker.ietf.org/doc/draft-dhodylee-pce-pcep-te-data-extn/

 

Major changes are:

-&nb= sp;         Security and M= anageability sections enhancement

-&nb= sp;         Make this expe= rimental track from a standard track.

 

In the last meeting, q= uite a few were interested in this draft, but there was also some objection= for this work to move on.

As we are proposing th= is work to be an experimental draft, we hope objection would be lifted.

 

Thanks,

Young & Dhruv

 

From: Dhruv Dh= ody
Sent: Thursday, March 05, 2015 12:59 AM
To: BELOTTI, SERGIO (SERGIO)
Cc: Dhruv Dhody; pce@ietf.org; Leeyoung; Daniele Ceccarelli
Subject: RE: draft-lee-pce-transporting-te-data-01.txt draft-dhodyle= e-pce-pcep-te-data-extn-01,

 

Hi Sergio,

 

[Adding WG in CC list]

 

Thanks for your mail, see inline…

 

From: BELOTTI,= SERGIO (SERGIO) [mailto:sergio.belotti@alcatel-lucent.com]
To: Leeyoung; Dhruv Dhody; Daniele Ceccarelli
Cc: BELOTTI, SERGIO (SERGIO)
Subject: draft-lee-pce-transporting-te-data-01.txt draft-dhodylee-pc= e-pcep-te-data-extn-01,

 

Hi Young, Druhv, Daniele

 

as promised I have some comments/clarifications to s= end after the meeting in Honolulu.

In general , as I’ve already said to Young aft= er presentation, I consider the intention to find alternative method to IGP= listening to feed TE topology information into PCE a very important issue = and the drafts are very useful .

Going into the drafts specifically , about the first= draft-lee-pce-transporting-te-data-01.txt  :

 

1)      In the second architecture option is considered as = possible intermediate entity an NMS ? NMS can simple retrieve topology by u= sual p2p request to nodes.

[Dhruv]: The document does not make any as= sumption on the intermediate system that implements the pub/sub paradigm; B= UT IMHO I don’t see intermediate entity as an NMS, I see it more like a special PCE with pub/sub functionality (like RR in case of = BGP).

2)      In the third architecture , PCEs to share informati= on among the other PCEs in the domain need to have routing protocol . this = does not permit to have a simplified implementation of PCE (since it does n= ot need to “listen” from network nodes no routing instance on board) . Is it correct my feeling?  

[Dhruv]: For PCE that share TED informatio= n to other PCEs, it can use the same PCEP TED population mechanism that is = used by the node (PCC) to PCE. Thus the PCEP extn should be extensible to handle PCE-PCE TED exchange. We do not want the dependenc= e on the routing protocol.

 

For the draft-dhodylee-pce-pcep-te-data-extn-01 :

·         In 9.2.4 TE Node Descriptor Sub= -TLVs is said at the last bullet “There can be at most one instance o= f each sub-TLV type present in any Node Descriptor”. But what does it mean : e.g. if one does not implement  BGP-LS why you would n= eed to put this type of sub-tlv? Or there is a specific value to put in cas= e you don’t’ use the sub-TLV?

[Dhruv]: The statement= means that you should not repeat the same sub-TLV twice. All SUB-TLV are n= ot mandatory, that is, you should include the sub-TLV only if needed; so BGP-LS sub-tlv should be added only if the node implements B= GP-LS. I can update text to reflect that.

·         9.2.5 : the chapter report = ; a table with only specific column for IS-IS , and relative value defined = for the sub-tlv. What about if you do not use IS-IS . Moreover the last part  of the paragraph talked about the information present = in the LSA/LSP originated by local node, and these information determine th= e set of sub-TLvs in the link. But what is the relationship with the just a= bove table? Are there other not mentioned sub-TLVs to include? Not totally clear what information is referring to. <= o:p>

[Dhruv]: PCEP will get= its own code points, those are in column 1 with TBD; the IS-IS column is t= o let the reader find the corresponding already-defined-TLV, since we do not want to repeat the format and fields of each of the TLV ag= ain in this document. Similar principle is followed by BGP-LS. This does no= t mean the implementation must have IS-IS enabled to use this extension.

·         9.2.6: Why again a sub-TLV spec= ific for IS-IS ? Moreover even if the draft does not mandate any particular= choice of routing protocol, is continuosly referring to BGP-LS , like a translation of BGP-LS sub-TLV into PCEP.

[Dhruv]: see above.

·         9.2.7 : is this TLV optional as= for the Node Attributes TLV? If yes this would be explicitly said. In the = table the is only mention of values referred to IS-IS or BGP-LS, what about OSPF-TE?

[Dhruv]:We are refereeing to IS-IS and BGP= -LS for the TLV format, it has no dependency on the actual protocol. Since = the TLV format is the same there is no reason to also mention OSPF here. Following text in the document states this – <= /span>

The format and semantics of t= he 'value' fields in most 'Link

   Descriptor' sub-= TLVs correspond to the format and semantics of value

   fields in IS-IS = Extended IS Reachability sub-TLVs, defined in

   [RFC5305], [RFC5= 307] and [RFC6119].  Although the encodings for 'Link

   Descriptor' TLVs= were originally defined for IS-IS, the TLVs can

   carry data sourc= ed either by IS-IS or OSPF or direct.

 

We have also updated the extension documen= t, see - http://www.ietf.org/id/draft-dhodylee-pce-pcep-te-data-extn-02.txt<= o:p>

 

Regards,

Dhruv

 

Thanks in advance for any clarifications you would p= rovide .

 

Sergio

 

 

 

--_000_7AEB3D6833318045B4AE71C2C87E8E1729C94D48dfweml706chm_-- From nobody Mon Mar 9 06:31:32 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 58EA01A8857; Mon, 9 Mar 2015 06:31:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ngG9fT3iE3x3; Mon, 9 Mar 2015 06:31:29 -0700 (PDT) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 525311A8855; Mon, 9 Mar 2015 06:31:21 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 5.12.0.p3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20150309133121.4433.27343.idtracker@ietfa.amsl.com> Date: Mon, 09 Mar 2015 06:31:21 -0700 Archived-At: Cc: pce@ietf.org Subject: [Pce] I-D Action: draft-ietf-pce-segment-routing-01.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2015 13:31:31 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path Computation Element Working Group of the IETF. Title : PCEP Extensions for Segment Routing Authors : Siva Sivabalan Jan Medved Clarence Filsfils Robert Raszuk Victor Lopez Jeff Tantsura Wim Henderickx Edward Crabbe Filename : draft-ietf-pce-segment-routing-01.txt Pages : 18 Date : 2015-03-09 Abstract: Segment Routing (SR) enables any head-end node to select any path without relying on a hop-by-hop signaling technique (e.g., LDP or RSVP-TE). It depends only on "segments" that are advertised by Link- State Interior Gateway Protocols (IGPs). A Segment Routed Path can be derived from a variety of mechanisms, including an IGP Shortest Path Tree (SPT), explicit configuration, or a Path Computation Element (PCE). This document specifies extensions to the Path Computation Element Protocol (PCEP) that allow a stateful PCE to compute and initiate Traffic Engineering (TE) paths, as well as a PCC to request a path subject to certain constraint(s) and optimization criteria in SR networks. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-segment-routing/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-pce-segment-routing-01 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-ietf-pce-segment-routing-01 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Mar 9 17:00:02 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 23A901ACE51; Mon, 9 Mar 2015 17:00:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KXPbjbnxmZYC; Mon, 9 Mar 2015 16:59:58 -0700 (PDT) Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 24C221ACEC9; Mon, 9 Mar 2015 16:59:51 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 5.12.0.p3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <20150309235951.3179.48445.idtracker@ietfa.amsl.com> Date: Mon, 09 Mar 2015 16:59:51 -0700 Archived-At: Cc: pce@ietf.org Subject: [Pce] I-D Action: draft-ietf-pce-lsp-setup-type-01.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Mar 2015 00:00:00 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Path Computation Element Working Group of the IETF. Title : Conveying path setup type in PCEP messages Authors : Siva Sivabalan Jan Medved Ina Minei Edward Crabbe Pantheon Technologies SRO Jeff Tantsura Filename : draft-ietf-pce-lsp-setup-type-01.txt Pages : 7 Date : 2015-03-09 Abstract: A Path Computation Element can compute traffic engineering paths (TE paths) through a network that are subject to various constraints. Currently, TE paths are label switched paths (LSPs) which are set up using the RSVP-TE signaling protocol. However, other TE path setup methods are possible within the PCE architecture. This document proposes an extension to PCEP to allow support for different path setup methods over a given PCEP session. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-setup-type/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-ietf-pce-lsp-setup-type-01 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-ietf-pce-lsp-setup-type-01 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue Mar 10 19:13:04 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 055C31A1B51 for ; Tue, 10 Mar 2015 19:13:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.211 X-Spam-Level: X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0kZzdYAqvRil for ; Tue, 10 Mar 2015 19:13:00 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 478C81A1AB6 for ; Tue, 10 Mar 2015 19:13:00 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml405-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BQC41638; Wed, 11 Mar 2015 02:12:58 +0000 (GMT) Received: from NKGEML404-HUB.china.huawei.com (10.98.56.35) by lhreml405-hub.china.huawei.com (10.201.5.242) with Microsoft SMTP Server (TLS) id 14.3.158.1; Wed, 11 Mar 2015 02:12:57 +0000 Received: from NKGEML501-MBS.china.huawei.com ([169.254.2.146]) by nkgeml404-hub.china.huawei.com ([10.98.56.35]) with mapi id 14.03.0158.001; Wed, 11 Mar 2015 10:12:54 +0800 From: Qin Wu To: "pce@ietf.org" Thread-Topic: Adding Service in draft-ietf-pce-segment-routing Thread-Index: AdAhkIKmpWnejd6LdUqNpDrChaYfOAHki2uAAhRB3EAKizkRUA== Date: Wed, 11 Mar 2015 02:12:54 +0000 Message-ID: References: <23CE718903A838468A8B325B80962F9B8700FCD5@blreml504-mbx.china.huawei.com> <23CE718903A838468A8B325B80962F9B87029198@BLREML509-MBX.china.huawei.com> In-Reply-To: <23CE718903A838468A8B325B80962F9B87029198@BLREML509-MBX.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.138.41.180] Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Cc: 'JP Vasseur' , "Siva Sivabalan \(msiva\)" Subject: Re: [Pce] Adding Service in draft-ietf-pce-segment-routing X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Mar 2015 02:13:03 -0000 SGksDQpIZXJlIGlzIHRoZSB1cGRhdGUgb2YgZHJhZnQtZHctcGNlLXNlcnZpY2Utc2VnbWVudC1y b3V0aW5nLTAxDQpodHRwczovL3Rvb2xzLmlldGYub3JnL3JmY2RpZmY/dXJsMj1kcmFmdC1kdy1w Y2Utc2VydmljZS1zZWdtZW50LXJvdXRpbmctMDEudHh0DQpJdCBiZWxvbmdzIGluIGRyYWZ0LWll dGYtcGNlLXNlZ21lbnQtcm91dGluZyBzaW5jZSBzZXJ2aWNlIGhhcyBhbHJlYWR5IGJlZW4gc3Vw cG9ydGVkIGluIHRoZSBTUFJJTkcgdXNlIGNhc2UuDQpodHRwczovL3Rvb2xzLmlldGYub3JnL2h0 bWwvZHJhZnQtZmlsc2ZpbHMtc3ByaW5nLXNlZ21lbnQtcm91dGluZy11c2UtIGNhc2VzLTAxDQoN Ckl0IHdvdWxkIGJlIGEgZ29vZCBpZGVhIHRvIG1lcmdlIHRoZSBpZGVhIGZyb20gdGhpcyBkcmFm dCBpbnRvIGRyYWZ0LWlldGYtcGNlLXNlZ21lbnQtcm91dGluZy4NClNpbmNlIHdoYXQgd2UgcHJv cG9zZWQgaW4gdGhpcyBkcmFmdCBpcyBqdXN0IGEgbWlub3IgZXh0ZW5zaW9uIHRvIGRyYWZ0LWll dGYtcGNlLXNlZ21lbnQtcm91dGluZywgDQppLmUuLCBhZGQgc2VydmljZSBzZWdtZW50IHN1cHBv cnQgaW4gdGhlIHNlZ21lbnQgcm91dGluZyBXRyBkcmFmdCwgSXQgc2VlbXMgbm90IHdvcnRoIA0K aGF2aW5nIGEgc2VwYXJhdGUgZHJhZnQgdG8gZG9jdW1lbnQgdGhpcyBtaW5vciBleHRlbnNpb24u DQoNCkFsc28gVGhpcyBkcmFmdCBoYXMgYmVlbiBkaXNjdXNzZWQgaW4gdGhlIGxhc3QgUENFIG1l ZXRpbmcuIHdlIGJlbGlldmUgd2UgaGF2ZSBhZGRyZXNzZWQgY29tbWVudCByYWlzZWQgaW4gdGhl IGxhc3QgbWVldGluZy4NCldlIGxpa2UgdG8gYXNrIFdHJ3Mgb3BpbmlvbiBvbiBtZXJnaW5nIHRo aXMgZHJhZnQgd2l0aCBkcmFmdC1pZXRmLXBjZS1zZWdtZW50LXJvdXRpbmcuDQoNClJlZ2FyZHOj oQ0KLVFpbi9EaHJ1dg0KPiAtLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KPiBGcm9tOiBTaXZh IFNpdmFiYWxhbiAobXNpdmEpIFttYWlsdG86bXNpdmFAY2lzY28uY29tXQ0KPiBTZW50OiAwNiBK YW51YXJ5IDIwMTUgMDE6MzkNCj4gVG86IERocnV2IERob2R5OyBKYW4gTWVkdmVkIChqbWVkdmVk KTsgQ2xhcmVuY2UgRmlsc2ZpbHMgKGNmaWxzZmlsKTsgDQo+IGVkd2FyZC5jcmFiYmVAZ21haWwu Y29tOyByb2JlcnRAcmFzenVrLm5ldDsgdmxvcGV6QHRpZC5lczsgSmVmZiANCj4gVGFudHN1cmEN Cj4gQ2M6IERocnV2IERob2R5OyBRaW4gV3U7IEpQIFZhc3NldXI7IEp1bGllbiBNZXVyaWMNCj4g U3ViamVjdDogUkU6IEFkZGluZyBTZXJ2aWNlIGluIGRyYWZ0LWlldGYtcGNlLXNlZ21lbnQtcm91 dGluZw0KPiANCj4gSGkgRGhydXY6DQo+IA0KPiBTb3JyeSBmb3IgdGhlIGRlbGF5Lg0KPiANCj4g SSB3aWxsIGdldCBiYWNrIHRvIHlvdSBzb21ldGltZSBuZXh0IHdlZWsuDQo+IA0KPiBUaGFua3Ms DQo+IFNpdmENCj4gDQo+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tDQo+IEZyb206IERocnV2 IERob2R5IFttYWlsdG86ZGhydXYuZGhvZHlAaHVhd2VpLmNvbV0NCj4gU2VudDogRnJpZGF5LCBE ZWNlbWJlciAyNiwgMjAxNCAxMTo0OSBQTQ0KPiBUbzogU2l2YSBTaXZhYmFsYW4gKG1zaXZhKTsg SmFuIE1lZHZlZCAoam1lZHZlZCk7IENsYXJlbmNlIEZpbHNmaWxzIA0KPiAoY2ZpbHNmaWwpOyBl ZHdhcmQuY3JhYmJlQGdtYWlsLmNvbTsgcm9iZXJ0QHJhc3p1ay5uZXQ7IHZsb3BlekB0aWQuZXM7 IA0KPiBKZWZmIFRhbnRzdXJhDQo+IENjOiBEaHJ1diBEaG9keTsgUWluIFd1OyBKUCBWYXNzZXVy OyBKdWxpZW4gTWV1cmljDQo+IFN1YmplY3Q6IEFkZGluZyBTZXJ2aWNlIGluIGRyYWZ0LWlldGYt cGNlLXNlZ21lbnQtcm91dGluZw0KPiANCj4gSGkgQXV0aG9ycywNCj4gDQo+IFsxXSBkZXNjcmli ZXMgJ3NlcnZpY2VzJyBpbiBTUFJJTkcgdXNlY2FzZXMuIFFpbiBhbmQgSSBmZWVsIHdlIGNhbiAN Cj4gc2ltcGx5IGV4dGVuZCB0aGUgV0cgZG9jdW1lbnQgWzJdIHRvIGhhbmRsZSB0aGlzIGluc3Rl YWQgb2YgYSBzZXBhcmF0ZSBkb2N1bWVudCBbM10uDQo+IA0KPiBXZSBoYXZlIHRha2VuIGEgc3Rh YiBhdCBpdCAoc2VlIGF0dGFjaGVkKSwgbGV0IHVzIGtub3cgeW91ciBvcGluaW9uIG9uIGl0Pw0K PiANCj4gUmVnYXJkcywNCj4gRGhydXYgLyBRaW4NCj4gDQo+IFsxXSANCj4gaHR0cHM6Ly90b29s cy5pZXRmLm9yZy9odG1sL2RyYWZ0LWZpbHNmaWxzLXNwcmluZy1zZWdtZW50LXJvdXRpbmctdXNl LQ0KPiBjYXNlcy0wMQ0KPiBbMl0gaHR0cHM6Ly90b29scy5pZXRmLm9yZy9odG1sL2RyYWZ0LWll dGYtcGNlLXNlZ21lbnQtcm91dGluZy0wMA0KPiBbM10gDQo+IGh0dHA6Ly9kYXRhdHJhY2tlci5p ZXRmLm9yZy9kb2MvZHJhZnQtZHctcGNlLXNlcnZpY2Utc2VnbWVudC1yb3V0aW5nLw0K From nobody Tue Mar 10 19:29:16 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4EA141A8899; 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Thu, 12 Mar 2015 01:51:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id z28RZCoxfqBG for ; Thu, 12 Mar 2015 01:51:51 -0700 (PDT) Received: from relais-inet.francetelecom.com (relais-ias91.francetelecom.com [193.251.215.91]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6B7AF1A870E for ; Thu, 12 Mar 2015 01:51:51 -0700 (PDT) Received: from omfedm05.si.francetelecom.fr (unknown [xx.xx.xx.1]) by omfedm14.si.francetelecom.fr (ESMTP service) with ESMTP id 81BAF22C999 for ; Thu, 12 Mar 2015 09:51:49 +0100 (CET) Received: from Exchangemail-eme1.itn.ftgroup (unknown [10.114.1.183]) by omfedm05.si.francetelecom.fr (ESMTP service) with ESMTP id 4F6EC35C045 for ; Thu, 12 Mar 2015 09:51:49 +0100 (CET) Received: from [10.193.71.188] (10.197.38.6) by PEXCVZYH02.corporate.adroot.infra.ftgroup (10.114.1.183) with Microsoft SMTP Server (TLS) id 14.3.224.2; Thu, 12 Mar 2015 09:51:48 +0100 Message-ID: <7031_1426150309_550153A5_7031_15236_1_550153A4.7080405@orange.com> Date: Thu, 12 Mar 2015 09:51:48 +0100 From: Organization: Orange User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: "pce@ietf.org" Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.197.38.6] X-PMX-Version: 6.0.3.2322014, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.3.12.61818 Archived-At: Subject: [Pce] Draft PCE Agenda for Dallas X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Julien Meuric , 'JP Vasseur' , Daniel King List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Mar 2015 08:51:53 -0000 Hi all. The draft agenda for the PCE meeting during IETF 92 is on line: http://www.ietf.org/proceedings/92/agenda/agenda-92-pce: - Should you have any comment, please share them with the chairs and secretary ASAP; - Should you be among the presenters, please send your slides to the same 3 by Sunday, March 22. Regards, JP & Julien _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. 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Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Mar 2015 15:48:04 -0000 SGVsbG8gSGFvbWlhbiwNCkkgd291bGQgaGF2ZSBzb21lIGNvbW1lbnRzL2NsYXJpZmljYXRpb24g b24gdGhlIHVwZGF0ZWQgcGFydCBvZiB0aGlzIGRyYWZ0Lg0KDQpTZWN0aW9uIDIuMg0KSSBoYXZl IHNvbWUgcHJvYmxlbSB3aXRoIHlvdXIgbGFzdCBwYXJ0IG9mIHRoZSBzZXNzaW9uOg0KIiBEdXJp bmcgdGhpcyBwcm9jZWR1cmUgaGlnaGVyLWxheWVyIFBDRSBjYW4gb25seSB1c2UgTFNQMSBpbmZv cm1hdGlvbiANCiAgIChzdWNoIGFzIGl0cyBmaXZlLXR1cGxlIExTUCBpbmZvcm1hdGlvbikgYXMg dGhlIGluZm9ybWF0aW9uLCBhbiANCiAgIGlzc3VlIHRvIHNvbHZlIGlzIGhvdyBsb3dlci1sYXll ciBQQ0UgY2FuIHJlc29sdmUgdGhpcyBpbmZvcm1hdGlvbiANCiAgIHRvIHRoZSBhY3R1YWwgcmVz b3VyY2UgdXNhZ2UgaW4gaXRzIG93biBsYXllciwgaS5lLiBsb3dlciBsYXllci4gDQogICBUaGlz IGNvdWxkIGJlIHNvbHZlZCBieSBlZGdlIExTUiBMMSByZXBvcnRpbmcgdGhpcyBoaWdoZXItbG93 ZXIgDQogICBsYXllciBMU1AgY29ycmVsYXRpb24gdG8gdGhlIGxvd2VyLWxheWVyIFBDRSBhcyBw YXJ0IG9mIHRoZSBMU1AgDQogICBpbmZvcm1hdGlvbiBkdXJpbmcgdGhlIExTUCBzdGF0ZSBzeW5j 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--_000_E0C26CAA2504C84093A49B2CAC3261A438C6E956SZXEMA504MBXchi_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi, Sergio,

 

Thanks for your comments, pl= ease see inline:)

 

Best wishes,

Haomian

 

-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: BELOTTI, SERGIO (SERGIO) [mailto:sergio.belotti@alcate= l-lucent.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA3=D4=C216=C8=D5 23:48
=CA=D5=BC=FE=C8=CB: Zhenghaomian
=B3=AD=CB=CD: pce@ietf.org; BELOTTI, SERGIO (SERGIO)
=D6=F7=CC=E2: RE: New Version Notification for draft-zhang-pce-resource-sh= aring-03.txt

 

Hello Haomian,

I would have some comments/c= larification on the updated part of this draft.

 

Section 2.2

I have some problem with you= r last part of the session:

" During this procedure= higher-layer PCE can only use LSP1 information

   (such as i= ts five-tuple LSP information) as the information, an

   issue to s= olve is how lower-layer PCE can resolve this information

   to the act= ual resource usage in its own layer, i.e. lower layer.

   This could= be solved by edge LSR L1 reporting this higher-lower

   layer LSP = correlation to the lower-layer PCE as part of the LSP

   informatio= n during the LSP state synchronization process. If needed,

   it can be = later updated when there is a change in this information.

   Alternativ= ely, the lower-layer PCE can get this information from

   other sour= ces, such as network management system, where this

   informatio= n should be stored."

 

Questions:=

a) what LSP1 information are= you referring ? which tuple? H1-H2-H3-H4-H5 ?

[Hao= mian] LSP1 refers to H2-H3 (as specified in the draft, two paragraph before= this), which actually come across H2-L1-L2-H3. 5-tuple here is used as an = example to uniquely identify the LSP with whom the new LSP share resource.

&= nbsp;

b) What issue has to solve t= he Lo PCE ?I sit not the Hi PCE indicating entry and exit point at lower la= yer as for RFC 5623 session 3.2?

[Hao= mian] As indicated in Section 3.2 of RFC5623, 'each PCE has topology visibi= lity restricted to its own layer'. In this case, for the same LSP (LSP1 in = this example), in the higher layer PCE it is considered as H2-H3. In this example, for the PCReq message from hig= her-layer PCE to lower-layer PCE is 'LSP2 should share as much as possible = with LSP1'. However, when higher-layer PCE consult to lower-layer PCE on re= source sharing when computing LSP2, the lower layer PCE need to detect the 'hidden' resource usage on the lowe= r layer, i.e., given 'LSP1' from higher layer PCE, the lower-layer PCE need= to map the LSP1 to 'H2-L1-L2-H3', and therefore detect the resource that c= an be shared with LSP2 in the lower layer is 'L1-L2'.

 

I se= e your point on Hi PCE have entry/exit point, in a inter-layer case, H2 can= sometimes have 'full knowledge' of L1, but it not necessarily means H2 (or= higher layer PCE) can know which lower-layer resource can be used to share. For example, the higher layer PCE knows the= lower-layer path of LSP1 is 'L1-L2', but there are multiple possibilities = in the lower-layer, it can be either 'L1-L2' or 'L1-L3-L4-L2'. Both of the = possible lower-layer paths is 'abstracted' as 'L1-L2' for higher-layer PCE. In this case, the issue for lower-layer P= CE is to find out which explicit link(s) is the target for resource sharing= .

&= nbsp;

c) Could you elaborate a lit= tle this mapping problem you mention?

[Hao= mian] The mapping problem is caused by the restricted visibility for each P= CE. I think the example in my previous comments is clear, let me know if an= y problem.  

&= nbsp;

" The process would be = similar to that

   of the pre= vious scenario. A point worth noting is that the border

   LSR node m= ay be able to resolve the higher layer LSP information

   itself, su= ch as mapping it to the corresponding LSP in the lower

   layer, in = this way lower-layer PCE does not need to perform this function. Otherwise,= the mapping method mentioned above can still be

   used. &quo= t;

 

Question:<= /p>

a)What mapping method are yo= u referring to ? Not clear whether and how you indicate to solve the proble= m.

[Hao= mian] As specified in previous comments, the objective of 'mapping' is to f= ind out 'L1-L2' from 'LSP1 in RSO' . As described in RFC5623, if inter-PCE = communication allowed, the PCReq message is sent from higher-layer PCE directly to lower-layer PCE during consultat= ion. If inter-PCE communication not allowed, the PCReq message should sent = from higher-layer PCE to H2 first, and then travel across L1 and lower-laye= r PCE. In this way, the 'mapping' issue is addressed by L1 instead of lower-layer PCE, as it has the lower-l= ayer knowledge for LSP1. In some other cases, if L1 don't have enough knowl= edge to find out which explicit link(s) can be used to share, it will also = leave the problem to lower-layer PCE, which will have a same solution as described in the previous section.=

&= nbsp;

 

Thanks a lot

 

BR

Sergio

 

 

 

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

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Zhenghaomian

Sent: venerd=A8=AC 27 febbraio 2015 07:53

To: pce@ietf.org<= /span>

Subject: [Pce] =D7=AA=B7=A2= : New Version Notification for draft-zhang-pce-resource-sharing-03.txt=

 

Dear PCEers,

 

We update the draft on PCE f= or resource sharing according to some offline comments, following changes a= re included in the updated version;

 

- Use Case 2 is modified to = describe the inter-layer resource sharing scenario;

- Specify resource sharing a= s a possible policy during path computation;

- Correct the semantic meani= ng of D and R bits in Section 5.2;

- Editorial changes;

 

Your review comments are mos= t welcome. Thanks.

 

Best wishes,

Haomian

 

-----=D3=CA=BC=FE=D4=AD=BC=FE-----

=B7=A2= =BC=FE=C8=CB: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]

=B7=A2= =CB=CD=CA=B1=BC=E4: 2015=C4=EA2=D4=C227=C8=D5 14:39

=CA=D5= =BC=FE=C8=CB: Oscar Gonzalez de Dios; Zhenghaom= ian; Victor Lopez; Zhangxian (Xian); Zhangxian (Xian); Oscar Gonzalez de Di= os; Victor Lopez; Zhenghaomian

=D6=F7= =CC=E2: New Version Notification for draft-zhan= g-pce-resource-sharing-03.txt

 

 

A new version of I-D, draft-= zhang-pce-resource-sharing-03.txt

has been successfully submit= ted by Haomian Zheng and posted to the IETF repository.

 

Name:    = ;           draft-zhang-p= ce-resource-sharing

Revision:  03

Title:   &nbs= p;            &= nbsp; Extensions to Path Computation Element Protocol (PCEP) to Support Res= ource Sharing-based Path Computation

Document date:  &n= bsp;    2015-02-27

Group:   &nbs= p;           Individual S= ubmission

Pages:   &nbs= p;           14

URL:    =         http://www.ietf.org/i= nternet-drafts/draft-zhang-pce-resource-sharing-03.txt

Status:   &nb= sp;     https://datatracker.i= etf.org/doc/draft-zhang-pce-resource-sharing/<= /p>

Htmlized:   &= nbsp;   http://tools.ietf.org= /html/draft-zhang-pce-resource-sharing-03

Diff:    = ;       http://www.ietf.org/r= fcdiff?url2=3Ddraft-zhang-pce-resource-sharing-03

 

Abstract:<= /p>

   Resource sharin= g in a network means two or more Label Switched Paths

   (LSPs) use comm= on piece(s) of resource along their paths. This can

   help save netwo= rk resource and useful in scenarios such as LSP

   recovery or whe= n two LSPs do not need to be active at the same time.

   A Path Computat= ion Element (PCE) is a centralized entity,

   responsible for= path computation. Given this feature and its access

   to the network = resource information and possibly active LSPs

   information, it= can be used to support resource-sharing-based path

   computation wit= h better efficiency.

 

   This document e= xtends the Path Computation Element Protocol (PCEP)

   in order to sup= port resource sharing-based path computation.

 

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

 

 

Please note that it may take= a couple of minutes from the time of submission until the htmlized version= and diff are available at tools.ietf.org.

 

The IETF Secretariat

 

____________________________= ___________________

Pce mailing list<= /span>

Pce@ietf.org

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

 

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charset="gb2312" Content-Transfer-Encoding: quoted-printable

FYI.

 

=B7=A2=BC=FE=C8=CB: Qin Wu
=B7=A2= =CB=CD=CA=B1=BC=E4: 2015=C4=EA3=D4=C217=C8=D5 12:01
=CA=D5=BC=FE=C8=CB: 'Ron Parker'
=B3=AD=CB=CD: Dhruv Dhody
=D6=F7=CC=E2: RE: Comments on draft-wu-pce-traffic-steering-sfc

 

Hi, Ron:

Thanks for your valuable comments. See my reply inline.

 

-Qin

=B7=A2=BC=FE=C8=CB: Ron Par= ker [mailto:Ron_Parker@a= ffirmednetworks.com]
=B7=A2= =CB=CD=CA=B1=BC=E4: 2015=C4=EA3=D4=C217=C8=D5 5:32
=CA=D5=BC=FE=C8=CB: Qin Wu
=D6=F7=CC=E2: Comments on draft-wu-pce-traffic-steering-sfc

 

In section 5.2.1, the format in= cudes the SFP ID and the Service Index.   But this is a message f= rom PCE to PCC (presumably the classifier).  

 

[Qin]:Correct.

 

What does the index mean in tha= t context?  

 

[Qin]: The index is used to count the number of service provided = by service function chain, When it is carried in the SFC encapsulation, it = can further be used by SFF to provide location within the service path. We will add some text to clarify this in the n= ext update.

 

 

Also, could you define or give = more background on =A1=B0PLSP-ID=A1=B1 in the SPI definition?

&n= bsp;

[Qin]:Okay, how about add the following text under the LSP Object= format in the draft:

=A1=B0

The PLSP-ID is a PCEP-spe= cific identifier for the LSP. It is set to a

   value that is constant for the lifetime o= f the PCEP session. A PCC

   creates a unique PLSP-ID for each LSP and= will advertise the same PLSP-ID

   on all PCEP sessions it maintains at a gi= ven times. The

   values of 0 and 0xFFFFF are reserved.

=A1=B1

Is the PCC expected to =A1=B0kn= ow=A1=B1 a priori the full sequence of SFF=A1=AFs and SFI=A1=AFs associated= to a Service Path ID?    Or should that be conveyed in the = message between PCE and PCC dynamically?   

&n= bsp;

[Qin]: In case SFC forwarding is fully distributed, PCE only needs t=
o compute the full sequence of SFF corresponding to SFP ID based on the sou=
rce address and destination address specified in the END- POINTS object of =
PCE message. The full sequence of SFF can be carried using Explicit Route O=
bject.
The classifier only needs to know how to map traffic to the specific=
 SFP.

full sequence of SFI=A1=AFs associated to a Service Path ID seems= not needed for the case when SFC forwarding is fully distributed.

 

If PCC is expected to =A1=B0know=A1=B1 a priori the full sequence= of SFI=A1=AFs associated to a Service Path ID, PCC can use segment routing= approach proposed in draft-dw-pce-servi= ce-segment-routing and  draft-ietf-pce-segment-rou= ting to determine a explicit path traversing by SF for the traff= ic. Yes, full sequence of SFI can be conveyed in the message between PCE and PCC.

Alternatively, PCC as classifier can interact with SFC controller= to get full sequence of SFI=A1=AFs.

 

Is the PCC expected to concrete= ly select the RSP ID (i.e., which SFI=A1=AFs exactly) and if so, how does t= hat factor into the approach?

&n= bsp;

[Qin]: If PCC is expected to concretely select the Rendered Servi= ce function Path, I think we can rely on service segment approach proposed = in draft-dw-pce-servi= ce-segment-routing combining with the mechanism proposed in draf= t-wu-pce-traffic-steering-sfc and segment routing approach defined in draft-ietf-pce-segment-r= outing.

 

Thanks.

 

    Ron

 

 

 

--_000_B8F9A780D330094D99AF023C5877DABA84704C98nkgeml501mbschi_-- From nobody Tue Mar 17 05:05:19 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 063441A0381 for ; Tue, 17 Mar 2015 05:05:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.211 X-Spam-Level: X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0c-Ajtd7-HpX for ; Tue, 17 Mar 2015 05:05:15 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6E8B21A014D for ; Tue, 17 Mar 2015 05:05:15 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml401-hub.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BQI50441; Tue, 17 Mar 2015 12:05:13 +0000 (GMT) Received: from BLREML407-HUB.china.huawei.com (10.20.4.45) by lhreml401-hub.china.huawei.com (10.201.5.240) with Microsoft SMTP Server (TLS) id 14.3.158.1; Tue, 17 Mar 2015 12:05:12 +0000 Received: from BLREML509-MBX.china.huawei.com ([169.254.7.185]) by BLREML407-HUB.china.huawei.com ([10.20.4.45]) with mapi id 14.03.0158.001; Tue, 17 Mar 2015 17:35:08 +0530 From: Dhruv Dhody To: "pce@ietf.org" Thread-Topic: [Pce] I-D Action: draft-ietf-pce-pce-initiated-lsp-03.txt Thread-Index: AQHQV61bIRd64CRoNUWbFLuKEv39HJ0ez/iA Date: Tue, 17 Mar 2015 12:05:08 +0000 Message-ID: <23CE718903A838468A8B325B80962F9B8708065E@BLREML509-MBX.china.huawei.com> References: <20150306013127.7175.22492.idtracker@ietfa.amsl.com> In-Reply-To: <20150306013127.7175.22492.idtracker@ietfa.amsl.com> Accept-Language: en-GB, zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.18.146.248] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Pce] I-D Action: draft-ietf-pce-pce-initiated-lsp-03.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Mar 2015 12:05:18 -0000 Hi,=20 Thanks for the update and taking care of the comments posted during WG LC [= 1].=20 But some issues are still open, let me repeat them -=20 (1) The text should be in line with RFC7399 [2]; where 'instantiate LSP' is= marked out of scope. The consensus was to use 'suggest' or 'recommend' wit= h ''instantiate LSP'. See [3]. I would like this to align between documents= , but if no one else is bothered with it, then I will shut up.=20 (2) Some text on LSPDB Synchronization is needed, perhaps in section 3.2, s= ee sample text -=20 LSP State Synchronization procedure is described in section 5.4 of [I-D.ietf-pce-stateful-pce]. During State Synchronization, a PCC SHOULD also send LSP State Report for PCE-Initiated LSP with Create flag and SYNC flag in the LSP Object set to 1. PCC SHOULD also include the optional SPEAKER-IDENTITY-ID TLV defined in [I-D.ietf- pce-stateful-sync-optimizations] identifying the PCE that requested the LSP creation. At the end of state synchronization, PCE SHOULD also do a sanity check between the reported PCE-Initiated LSPs and local configurations at PCE to initiate LSPs. For any mismatch, PCE SHOULD send PCInitiate message to either initiate (again) or remove those LSPs. Thanks again!=20 Regards, Dhruv [1] http://www.ietf.org/mail-archive/web/pce/current/msg04092.html [2] http://tools.ietf.org/html/rfc7399#section-20 [3] http://www.ietf.org/mail-archive/web/pce/current/msg03721.html > -----Original Message----- > From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of internet-drafts@ietf= .org > Sent: 06 March 2015 07:01 > To: i-d-announce@ietf.org > Cc: pce@ietf.org > Subject: [Pce] I-D Action: draft-ietf-pce-pce-initiated-lsp-03.txt >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Path Computation Element Working Group = of > the IETF. >=20 > Title : PCEP Extensions for PCE-initiated LSP Setup in = a > Stateful PCE Model > Authors : Edward Crabbe > Ina Minei > Siva Sivabalan > Robert Varga > Filename : draft-ietf-pce-pce-initiated-lsp-03.txt > Pages : 16 > Date : 2015-03-05 >=20 > Abstract: > The Path Computation Element Communication Protocol (PCEP) provides > mechanisms for Path Computation Elements (PCEs) to perform path > computations in response to Path Computation Clients (PCCs) requests. >=20 > The extensions for stateful PCE provide stateful control of > Multiprotocol Label Switching (MPLS) Traffic Engineering Label > Switched Paths (TE LSP) via PCEP, for a model where the PCC delegates > control over one or more locally configured LSPs to the PCE. This > document describes the creation and deletion of PCE-initiated LSPs > under the stateful PCE model. >=20 >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-pce-pce-initiated-lsp/ >=20 > There's also a htmlized version available at: > http://tools.ietf.org/html/draft-ietf-pce-pce-initiated-lsp-03 >=20 > A diff from the previous version is available at: > http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-pce-initiated-lsp-03 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce From nobody Wed Mar 18 09:13:44 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 193941A6EFC for ; Wed, 18 Mar 2015 09:13:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.12 X-Spam-Level: X-Spam-Status: No, score=-4.12 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, CN_BODY_35=0.339, HTML_MESSAGE=0.001, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_HI=-5, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ES5dyE5P-4Zw for ; Wed, 18 Mar 2015 09:13:39 -0700 (PDT) Received: from smtp-fr.alcatel-lucent.com (fr-hpgre-esg-01.alcatel-lucent.com [135.245.210.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9D42C1A1EF2 for ; Wed, 18 Mar 2015 09:13:38 -0700 (PDT) Received: from fr711usmtp1.zeu.alcatel-lucent.com (unknown [135.239.2.122]) by Websense Email Security Gateway with ESMTPS id AD8A111CE93E9; Wed, 18 Mar 2015 16:13:31 +0000 (GMT) Received: from FR711WXCHHUB01.zeu.alcatel-lucent.com (fr711wxchhub01.zeu.alcatel-lucent.com [135.239.2.111]) by fr711usmtp1.zeu.alcatel-lucent.com (GMO) with ESMTP id t2IGCMNi032518 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 18 Mar 2015 17:13:34 +0100 Received: from FR711WXCHMBA05.zeu.alcatel-lucent.com ([169.254.1.213]) by FR711WXCHHUB01.zeu.alcatel-lucent.com ([135.239.2.111]) with mapi id 14.03.0195.001; Wed, 18 Mar 2015 17:13:18 +0100 From: "BELOTTI, SERGIO (SERGIO)" To: Zhenghaomian Thread-Topic: New Version Notification for draft-zhang-pce-resource-sharing-03.txt Thread-Index: AdBgZKmqRLWFhXsOlk+Cu/uJxnpenABMSuNA Date: Wed, 18 Mar 2015 16:13:17 +0000 Message-ID: References: In-Reply-To: Accept-Language: it-IT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: 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Th= anks Haomian,

 

I see your points now.<= /o:p>

 

 

BR

Thanks

sergio

 

=  

From: Zhenghaomian= [mailto:zhenghaomian@huawei.com]
Sent: marted=A8=AC 17 marzo 2015 04:44
To: BELOTTI, SERGIO (SERGIO)
Cc: pce@ietf.org
Subject: =B4=F0=B8=B4: New Version = Notification for draft-zhang-pce-resource-sharing-03.txt<= /p>

 

Hi, Sergio,

 

Thanks for your comments, pl= ease see inline:)

 

Best wishes,

Haomian

 

-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB= : BELOTTI, SERGIO (SERGIO) [mailto:sergio.belotti@alcatel-lucent.com<= /a>]
=B7=A2=CB=CD=CA=B1= =BC=E4: 2015=C4=EA3=D4=C2= 16=C8=D5 23:48
=CA=D5=BC=FE=C8=CB= : Zhenghaomian
=B3=AD=CB=CD: pce@ietf.org; BELOTTI, SERGIO (SERGIO)<= br> =D6=F7=CC=E2: RE: New Version Notification for draft-zhang-pce-re= source-sharing-03.txt

 

Hello Haomian,

I would have some comments/c= larification on the updated part of this draft.

 

Section 2.2

I have some problem with you= r last part of the session:

" During this procedure= higher-layer PCE can only use LSP1 information

   (such as i= ts five-tuple LSP information) as the information, an

   issue to s= olve is how lower-layer PCE can resolve this information

   to the act= ual resource usage in its own layer, i.e. lower layer.

   This could= be solved by edge LSR L1 reporting this higher-lower

   layer LSP = correlation to the lower-layer PCE as part of the LSP

   informatio= n during the LSP state synchronization process. If needed,

   it can be = later updated when there is a change in this information.

   Alternativ= ely, the lower-layer PCE can get this information from

   other sour= ces, such as network management system, where this

   informatio= n should be stored."

 

Questions:=

a) what LSP1 information are= you referring ? which tuple? H1-H2-H3-H4-H5 ?

[Hao= mian] LSP1 refers to H2-H3 (as specified in the draft, two paragraph before= this), which actually come across H2-L1-L2-H3. 5-tuple here is used as an = example to uniquely identify the LSP with whom the new LSP share resource.

&= nbsp;

b) What issue has to solve t= he Lo PCE ?I sit not the Hi PCE indicating entry and exit point at lower la= yer as for RFC 5623 session 3.2?

[Hao= mian] As indicated in Section 3.2 of RFC5623, 'each PCE has topology visibi= lity restricted to its own layer'. In this case, for the same LSP (LSP1 in = this example), in the higher layer PCE it is considered as H2-H3. In this example, for the PCReq message from hig= her-layer PCE to lower-layer PCE is 'LSP2 should share as much as possible = with LSP1'. However, when higher-layer PCE consult to lower-layer PCE on re= source sharing when computing LSP2, the lower layer PCE need to detect the 'hidden' resource usage on the lowe= r layer, i.e., given 'LSP1' from higher layer PCE, the lower-layer PCE need= to map the LSP1 to 'H2-L1-L2-H3', and therefore detect the resource that c= an be shared with LSP2 in the lower layer is 'L1-L2'.

 

I se= e your point on Hi PCE have entry/exit point, in a inter-layer case, H2 can= sometimes have 'full knowledge' of L1, but it not necessarily means H2 (or= higher layer PCE) can know which lower-layer resource can be used to share. For example, the higher layer PCE knows the= lower-layer path of LSP1 is 'L1-L2', but there are multiple possibilities = in the lower-layer, it can be either 'L1-L2' or 'L1-L3-L4-L2'. Both of the = possible lower-layer paths is 'abstracted' as 'L1-L2' for higher-layer PCE. In this case, the issue for lower-layer P= CE is to find out which explicit link(s) is the target for resource sharing= .

&= nbsp;

c) Could you elaborate a lit= tle this mapping problem you mention?

[Hao= mian] The mapping problem is caused by the restricted visibility for each P= CE. I think the example in my previous comments is clear, let me know if an= y problem.  

&= nbsp;

" The process would be = similar to that

   of the pre= vious scenario. A point worth noting is that the border

   LSR node m= ay be able to resolve the higher layer LSP information

   itself, su= ch as mapping it to the corresponding LSP in the lower

   layer, in = this way lower-layer PCE does not need to perform this function. Otherwise,= the mapping method mentioned above can still be

   used. &quo= t;

 

Question:<= /p>

a)What mapping method are yo= u referring to ? Not clear whether and how you indicate to solve the proble= m.

[Hao= mian] As specified in previous comments, the objective of 'mapping' is to f= ind out 'L1-L2' from 'LSP1 in RSO' . As described in RFC5623, if inter-PCE = communication allowed, the PCReq message is sent from higher-layer PCE directly to lower-layer PCE during consultat= ion. If inter-PCE communication not allowed, the PCReq message should sent = from higher-layer PCE to H2 first, and then travel across L1 and lower-laye= r PCE. In this way, the 'mapping' issue is addressed by L1 instead of lower-layer PCE, as it has the lower-l= ayer knowledge for LSP1. In some other cases, if L1 don't have enough knowl= edge to find out which explicit link(s) can be used to share, it will also = leave the problem to lower-layer PCE, which will have a same solution as described in the previous section.=

&= nbsp;

 

Thanks a lot

 

BR

Sergio

 

 

 

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

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Zhenghaomian

Sent: venerd=A8=AC 27 febbraio 2015 07:53

To: pce@ietf.org<= /span>

Subject: [Pce] =D7=AA=B7=A2: New Version Notification for draft-zhang-pce-resource-sharing-= 03.txt

 

Dear PCEers,

 

We update the draft on PCE f= or resource sharing according to some offline comments, following changes a= re included in the updated version;

 

- Use Case 2 is modified to = describe the inter-layer resource sharing scenario;

- Specify resource sharing a= s a possible policy during path computation;

- Correct the semantic meani= ng of D and R bits in Section 5.2;

- Editorial changes;

 

Your review comments are mos= t welcome. Thanks.

 

Best wishes,

Haomian

 

-----=D3=CA=BC=FE=D4=AD=BC=FE-----

=B7=A2=BC=FE=C8=CB: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]

=B7=A2=CB=CD=CA=B1=BC=E4: 2015=C4=EA= 2=D4=C227=C8=D5 14:39

=CA=D5=BC=FE=C8=CB: Oscar Gonzalez de Dios; Zh= enghaomian; Victor Lopez; Zhangxian (Xian); Zhangxian (Xian); Oscar Gonzale= z de Dios; Victor Lopez; Zhenghaomian

=D6=F7=CC=E2: New Version Notification for dra= ft-zhang-pce-resource-sharing-03.txt

 

 

A new version of I-D, draft-= zhang-pce-resource-sharing-03.txt

has been successfully submit= ted by Haomian Zheng and posted to the IETF repository.

 

Name:    = ;           draft-zhang-p= ce-resource-sharing

Revision:  03

Title:   &nbs= p;            &= nbsp; Extensions to Path Computation Element Protocol (PCEP) to Support Res= ource Sharing-based Path Computation

Document date:  &n= bsp;    2015-02-27

Group:   &nbs= p;           Individual S= ubmission

Pages:   &nbs= p;           14

URL:    =         http://www.ietf.org/i= nternet-drafts/draft-zhang-pce-resource-sharing-03.txt

Status:   &nb= sp;     https://datatracker.i= etf.org/doc/draft-zhang-pce-resource-sharing/<= /p>

Htmlized:   &= nbsp;   http://tools.ietf.org= /html/draft-zhang-pce-resource-sharing-03

Diff:    = ;       http://www.ietf.org/r= fcdiff?url2=3Ddraft-zhang-pce-resource-sharing-03

 

Abstract:<= /p>

   Resource sharin= g in a network means two or more Label Switched Paths

   (LSPs) use comm= on piece(s) of resource along their paths. This can

   help save netwo= rk resource and useful in scenarios such as LSP

   recovery or whe= n two LSPs do not need to be active at the same time.

   A Path Computat= ion Element (PCE) is a centralized entity,

   responsible for= path computation. Given this feature and its access

   to the network = resource information and possibly active LSPs

   information, it= can be used to support resource-sharing-based path

   computation wit= h better efficiency.

 

   This document e= xtends the Path Computation Element Protocol (PCEP)

   in order to sup= port resource sharing-based path computation.

 

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

 

 

Please note that it may take= a couple of minutes from the time of submission until the htmlized version= and diff are available at tools.ietf.org.

 

The IETF Secretariat

 

____________________________= ___________________

Pce mailing list<= /span>

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--_000_B9FEE68CE3A78C41A2B3C67549A96F48B75C0EF9FR711WXCHMBA05z_-- From nobody Sun Mar 22 10:09:02 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B6E621A000F for ; Sun, 22 Mar 2015 10:09:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SjW31o89ker9 for ; Sun, 22 Mar 2015 10:08:59 -0700 (PDT) Received: from mail-we0-f172.google.com (mail-we0-f172.google.com [74.125.82.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 179DD1A002C for ; Sun, 22 Mar 2015 10:08:59 -0700 (PDT) Received: by wegp1 with SMTP id p1so120154543weg.1 for ; Sun, 22 Mar 2015 10:08:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version:content-type:thread-index:content-language; bh=BWIPO8XhNU9wxizwS0e0O5hTzgXId/UzQLYjMOs1eK8=; b=McAqA2zgYvR5zfkDJC0WzKIyzX8XuKRbiVySbYypB4lIG0Q4UlYlqlfPK3z2HmB9YL aKMkg+i9DfV8c03luA8tDThHH0eNgdv2GY2/uETg12gFr/qFdf8MbZrv+TX74qEHTw0t yi7kwj1KtzVPfx/2VOww2tKwfCPqK74PIdvenEBabKrUVzeYfgb7HLllqjZYpust9DfY hvilsXjgs95Mq0TIJwKpC/8Sx8OKtaomFYhjMguBIgwMaOt28S1fSfxz+vfnwPS0bN+Y I1bYgnslDA3z6vyn4dqwFApaRCKGsj3U7vxFKdzD0h+jJzIB4Wg0qy5vG8CLKgB7Udx8 ZhOA== X-Gm-Message-State: ALoCoQnvFeJQLAzvTwSONBlnuGbJbOJnaduizBG4hPFc0iFIdRn6t4KrxjNqitecUGFEdliQnYYG X-Received: by 10.194.8.99 with SMTP id q3mr182087955wja.88.1427044137822; Sun, 22 Mar 2015 10:08:57 -0700 (PDT) Received: from MAL ([31.6.58.158]) by mx.google.com with ESMTPSA id gd6sm7369788wib.17.2015.03.22.10.08.54 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 22 Mar 2015 10:08:56 -0700 (PDT) Sender: Daniel King X-Google-Original-Sender: "Daniel King" From: To: Date: Sun, 22 Mar 2015 12:08:55 -0500 Message-ID: <003301d064c2$e3374e70$a9a5eb50$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0034_01D06498.FA61E2B0" X-Mailer: Microsoft Outlook 15.0 Thread-Index: AdBkwldP4FWLUkGGQb6A/Ryg2apA4Q== Content-Language: en-gb Archived-At: Cc: "'Y. Richard Yang'" , qzhao@huawei.com Subject: [Pce] [rfc-dist] RFC 7491 on A PCE-Based Architecture for Application-Based Network Operations X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Mar 2015 17:09:00 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0034_01D06498.FA61E2B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi All, Just a heads up that the ABNO Framework I-D was recently published as RFC7491 - https://tools.ietf.org/html/rfc7491. Thanks to the ABNO authors/contributors and Alia for sponsoring the I-D and helping polish the document in the final stages. BR, Dan. ------=_NextPart_000_0034_01D06498.FA61E2B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi All,

 

Just a heads = up that the ABNO Framework I-D was recently published as RFC7491 - https://tools.ietf.org/html/= rfc7491.

 

Thanks to the ABNO authors/contributors and Alia for = sponsoring the I-D and helping polish the document in the final stages. =

 

BR, Dan.

------=_NextPart_000_0034_01D06498.FA61E2B0-- From nobody Wed Mar 25 09:36:03 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D9EBA1A88FA for ; Wed, 25 Mar 2015 09:36:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.76 X-Spam-Level: X-Spam-Status: No, score=-1.76 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MIME_CHARSET_FARAWAY=2.45, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sjkLchkmIp1l for ; Wed, 25 Mar 2015 09:35:54 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5FBC91A898A for ; 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FYI.

This is related to control of Service Function Path establishment=

The relevant draft in PCE is draft-wu-pce-traffic-= steering-sfc.

 

-Qin

=B7=A2=BC=FE=C8=CB: sfc [mailto:sfc-bounc= es@ietf.org] =B4=FA=B1=ED = Linda Dunbar
=B7=A2=CB=CD= =CA=B1=BC=E4: 2015=C4=EA3=D4=C2<= span lang=3D"EN-US">25=C8=D5 23:43
=CA=D5=BC=FE=C8=CB: sfc@ietf.org
=B3=AD=CB=CD: 'Jim Guichard (jguichar)'; Thomas Narten
=D6=F7=CC=E2: [sfc] Minutes of the SFC Control Plane side meeting

 

Minutes of the SFC = Control Plane side meeting

March 25, 8am-9am=

 

Participants:

Joel Halpern, Jim Guichard, Paul Quinn= , Andy Malis, Walter Haeffner, Mohamed Boucadair, Qin Wu, James Huang, Seun= gik Lee, and Linda Dunbar

 =

 =

Agreed:

SFC WG needs to document the overall i= nterfaces for controlling service function path.

Agreed the following interfaces for co= ntrol plane.

 

 

SFC  Cont= rol Plane  Architecture

 

=            =             &nb= sp; +-------------+ 

=            =             &nb= sp; | SF Client   |

=            =             &nb= sp; +------+------+

=         &nbs= p;            &= nbsp;          | M1: interface to clients

+-----= ---------------------------------------------------------------+

|SFC Manag= ement, compute, and control  components     &= nbsp;            &nb= sp; |

| &nb= sp;            =             &nb= sp;            =             &nb= sp;            =     |         &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;        +---------+--------------------------+------------------------= ------++       

 &nbs= p;        C1    = ;            &n= bsp;        |C2    &= nbsp;           &nbs= p;           |F2

 &nbs= p; +------|--------------------------|---------------------------+&= nbsp; |

 &nbs= p; |      |     &nbs= p;            &= nbsp;       |     &n= bsp;            = ;         |  |

 &nbs= p; |      |      &nb= sp;       +-----------+-------------&= #43;            = ; |  |

 &nbs= p; |      |      &nb= sp;       |     &nbs= p;     |        = ;     |        =      |  |

 &nbs= p; | +----+--- --+       | &= nbsp;         |   &n= bsp;         |   &nb= sp;         |  |

 &nbs= p; | |   SFC     |     &#= 43;----+      +-|--+   =      +----+      =     |  |

 &nbs= p; | |Classifier |---->|SFF |----->|SFF |------->|SFF |  = ;        |  |

 &nbs= p; | |   Node    |<----|    |<= ;-----|    |<-------|    |  &nbs= p;       |  |

 &nbs= p; | +-----------+     +----+ &nbs= p;    +----+      &nbs= p; +----+          |&n= bsp; |

 &nbs= p; |            = ;         |    =        |      &= nbsp;       |     &n= bsp;      |  |

 &nbs= p; |            = ;         |    =     -------        &= nbsp;  |          &n= bsp; |  |

 &nbs= p; |            = ;         |    =    |       |    = ; +-----------+ F1  |  |

 &nbs= p; |            = ;         V    = +----+ +----+   | SF  Proxy |-----+&nbs= p; | 

 &nbs= p; |           =             &nb= sp;   | SF | |SF  |   +-----------+ &= nbsp;   |  |

 &nbs= p; |            = ;            &n= bsp;  +-+--+ +-+--+    &nb= sp;            =     |  |

 &nbs= p; |            = ;            &n= bsp;    |F     |F    = ;            &n= bsp;      |  |

 &nbs= p; |  SFC Data Plane Components  +------+----------------= --------+--+ 

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

 &nbs= p; |-------------------------------------------------------------+=

 

 

The SFC control plane architecture wil= l specify the interfaces for

-          Classifier

-          SFF

-          Service functions (and SF proxy)

And will specify the content to be exc= hanged over each interface for controlling Service Function Path establishm= ent and alternation due to SFC policy change or SF/network failures. 

 

We a= re looking for comments from the community with regard to this proposed SFC= control plane architecture.

 

Agre= ed that IETF 93 Prague meeting will allocate a dedicated slot for control p= lane discussion.

 

Chee= rs,

 

Lind= a Dunbar

--_000_B8F9A780D330094D99AF023C5877DABA8471246Cnkgeml501mbschi_-- --_004_B8F9A780D330094D99AF023C5877DABA8471246Cnkgeml501mbschi_ Content-Type: text/plain; name="ATT00001.txt" Content-Description: ATT00001.txt Content-Disposition: attachment; filename="ATT00001.txt"; size=124; creation-date="Wed, 25 Mar 2015 16:01:06 GMT"; modification-date="Wed, 25 Mar 2015 16:01:06 GMT" Content-ID: <12BE837833BD21409127FD8D953967E9@huawei.com> Content-Transfer-Encoding: base64 X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18NCnNmYyBtYWls aW5nIGxpc3QNCnNmY0BpZXRmLm9yZw0KaHR0cHM6Ly93d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0 aW5mby9zZmMNCg== --_004_B8F9A780D330094D99AF023C5877DABA8471246Cnkgeml501mbschi_-- From nobody Wed Mar 25 14:04:25 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 935421A8A98 for ; Wed, 25 Mar 2015 14:04:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1N4EgahoXOD5 for ; Wed, 25 Mar 2015 14:04:14 -0700 (PDT) Received: from mail-ie0-x233.google.com (mail-ie0-x233.google.com [IPv6:2607:f8b0:4001:c03::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0FB521A8AAF for ; Wed, 25 Mar 2015 14:04:11 -0700 (PDT) Received: by iedfl3 with SMTP id fl3so36177858ied.1 for ; Wed, 25 Mar 2015 14:04:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:date:message-id:subject:from:to:content-type; bh=XEh3A+QMPOOvEVnZBaBMLDRUviKaP0Zv5MhjtRriWsQ=; b=QTX+VlIECjaRxOgunkvzj3rF0feWHW1suWHIQKBHiaOFPZRIKGEVBZNVawlKFqR2tL Jw0lDrmMk/1DJZEOFamNqDpUqtoSIIkjQPr1uMdMtG05lcRA81bp9Tv+Twmx5vG9R19H uUeDyKF7APAthFqmXJ71bxDoDJdn8rQPAYHSA2sp638t/09WIWb8R48YcC+mozdedZs4 lsewsNcv972NfhPoSA7sdQNUkoa6drD87KnYkJvTMs0jVZRGnem8wvMi4TRnUmvfz1hQ cGGlXkH7hR8iRoL54X/nWXVH1BHKvjaAO0zdZTIHZCGfYiXZUZmga8B0LswW4dVDXgRR OiAg== MIME-Version: 1.0 X-Received: by 10.42.114.3 with SMTP id e3mr25559820icq.27.1427317450442; Wed, 25 Mar 2015 14:04:10 -0700 (PDT) Sender: dhruvdhody@gmail.com X-Google-Sender-Delegation: dhruvdhody@gmail.com Received: by 10.50.167.2 with HTTP; Wed, 25 Mar 2015 14:04:10 -0700 (PDT) Date: Wed, 25 Mar 2015 16:04:10 -0500 X-Google-Sender-Auth: DIti_3zx5DID0e378DRWK1r8akI Message-ID: From: Dhruv Dhody To: "pce@ietf.org" Content-Type: multipart/alternative; boundary=20cf303f6e209d90060512233d83 Archived-At: Subject: [Pce] PCE as a Central Controller X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2015 21:04:15 -0000 --20cf303f6e209d90060512233d83 Content-Type: text/plain; charset=UTF-8 Hi, We couldn't get a chance to present in the WG, because of the excellent discussion about DetNet. BTW, here is the link to the slides: http://www.ietf.org/proceedings/92/slides/slides-92-pce-3.pdf Do find me in the hallways or offline if this work strikes your fancy! And I can manage to show a quick demo too! Thanks! Dhruv --20cf303f6e209d90060512233d83 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi,

We couldn&= #39;t get a chance to present in the WG, because of the excellent discussio= n about DetNet.

BTW, here is the link to the slides: http://www.ietf= .org/proceedings/92/slides/slides-92-pce-3.pdf

Do find me in the= hallways or offline if this work strikes your fancy! And I can manage to s= how a quick demo too!

Thanks!

Dhruv
--20cf303f6e209d90060512233d83-- From nobody Wed Mar 25 16:23:18 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 728BD1A9153 for ; Wed, 25 Mar 2015 16:23:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.61 X-Spam-Level: X-Spam-Status: No, score=-2.61 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1X9FZWw___Bz for ; Wed, 25 Mar 2015 16:23:15 -0700 (PDT) Received: from ENFICSETS1.metaswitch.com (enficsets1.metaswitch.com [192.91.191.38]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E24E71A8A63 for ; Wed, 25 Mar 2015 16:23:14 -0700 (PDT) Received: from ENFIRHMBX1.datcon.co.uk (172.18.74.36) by ENFICSETS1.metaswitch.com (172.18.4.18) with Microsoft SMTP Server (TLS) id 14.3.224.2; Wed, 25 Mar 2015 23:23:08 +0000 Received: from ENFICSMBX1.datcon.co.uk ([fe80::d5d5:c683:a3be:3a19]) by ENFIRHMBX1.datcon.co.uk ([fe80::b06d:4d13:5f63:3715%12]) with mapi id 14.03.0224.002; Wed, 25 Mar 2015 23:23:13 +0000 From: Jonathan Hardwick To: Jeff Tantsura Thread-Topic: Comment on draft-ietf-pce-segment-routing-01 Thread-Index: AdBnUqmGmqdQpQQXQvqi/1kiPeBWRQ== Date: Wed, 25 Mar 2015 23:23:12 +0000 Message-ID: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.18.34.139] Content-Type: multipart/alternative; boundary="_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0FENFICSMBX1dat_" MIME-Version: 1.0 Archived-At: Cc: "pce@ietf.org" , "draft-ietf-pce-segment-routing@tools.ietf.org" Subject: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2015 23:23:17 -0000 --_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0FENFICSMBX1dat_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Jeff I just wanted to clarify the comment that I made at the mic today as we see= med to be talking at cross-purposes. The draft sets a maximum SID depth in the Open message, which effectively c= reates an implicit constraint on all queries that are sent over the PCEP se= ssion, such that returned paths must not have a SID stack depth greater tha= n the MSD. I think this is wrong, and that the MSD should instead be sent = as an explicit constraint on each query. Here is my reasoning. In the PCE architecture it is wrong to assume that the PCC and the ingress = router are the same device. There are at least two cases where it is not. * In some network management architectures, the PCC is a network ma= nagement tool. The network management tool may have many ingress routers i= n its jurisdiction, each with a different MSD, so it is not true to say tha= t the MSD is a constant for the PCC-PCE session. * In inter-domain routing there is PCE-PCE communication between do= mains. One of the PCEs plays the role of PCC and is acting on behalf of al= l edge routers in its domain (or perhaps some domain further upstream). Ag= ain, the MSD is not constant on the PCE-PCE session. I don't think that we should rule either of these scenarios out of segment = routing, even if they are not the first scenarios that everyone is targetin= g. At some point we will want to do them and we do not want to re-do the w= ork that we are doing today to make them work. Best regards Jon --_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0FENFICSMBX1dat_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Jeff

 

I just wanted to clarify the comment that I made at = the mic today as we seemed to be talking at cross-purposes.

 

The draft sets a maximum SID depth in the Open messa= ge, which effectively creates an implicit constraint on all queries that ar= e sent over the PCEP session, such that returned paths must not have a SID = stack depth greater than the MSD.  I think this is wrong, and that the MSD should instead be sent as an expli= cit constraint on each query.  Here is my reasoning.

 

In the PCE architecture it is wrong to assume that t= he PCC and the ingress router are the same device.  There are at least= two cases where it is not.

·         In some network management architectures, th= e PCC is a network management tool.  The network management tool may h= ave many ingress routers in its jurisdiction, each with a different MSD, so= it is not true to say that the MSD is a constant for the PCC-PCE session.

·         In inter-domain routing there is PCE-PCE com= munication between domains.  One of the PCEs plays the role of PCC and= is acting on behalf of all edge routers in its domain (or perhaps some dom= ain further upstream).  Again, the MSD is not constant on the PCE-PCE session.

 

I don’t think that we should rule either of th= ese scenarios out of segment routing, even if they are not the first scenar= ios that everyone is targeting.  At some point we will want to do them= and we do not want to re-do the work that we are doing today to make them work.

 

Best regards

Jon

 

--_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0FENFICSMBX1dat_-- From nobody Wed Mar 25 16:44:53 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 130631B29E8 for ; Wed, 25 Mar 2015 16:44:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Acc4IZ3RoZVD for ; Wed, 25 Mar 2015 16:44:49 -0700 (PDT) Received: from mail-ig0-x22a.google.com (mail-ig0-x22a.google.com [IPv6:2607:f8b0:4001:c05::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 205031B29B9 for ; Wed, 25 Mar 2015 16:44:49 -0700 (PDT) Received: by igcau2 with SMTP id au2so3855530igc.1 for ; Wed, 25 Mar 2015 16:44:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=R2oyYGod0yWcEwwmK152rzRRN4tGSUYnNyU9VeqlZN4=; b=SjlzxdYzvjzWnMxDEYB54RcbGl6bw9bZojq2dYaoVSMp5TYff5JyIcaKkPa+PFluRi /W6PufN+uiX5MUCxIMzUkTdhBL9XrsB9hrvVMmv095Di2tzNYtCJKOIDN+EDe4+U/kh5 +BiYsWbNrdqDwJPgRFLQ+xjnzUrJQz0R/reMaYbDVkrGddxExtZo+htx5xYz6DtkWpFY D/741k+BBtLJIkAZKKntJgjKp7w0GFObEgTKg8Z9VHHjB9x0BPRKyGcEi+JjAocZBGQm bjiSS/+5L8nanVJf+YMXoLVhZ+j5gvs8DvM8C6ukjmgiaqGN3m9s/E6caQygfJghEg4o rTRA== MIME-Version: 1.0 X-Received: by 10.107.155.13 with SMTP id d13mr16884637ioe.29.1427327088490; Wed, 25 Mar 2015 16:44:48 -0700 (PDT) Sender: dhruvdhody@gmail.com X-Google-Sender-Delegation: dhruvdhody@gmail.com Received: by 10.50.167.2 with HTTP; Wed, 25 Mar 2015 16:44:48 -0700 (PDT) In-Reply-To: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> Date: Wed, 25 Mar 2015 18:44:48 -0500 X-Google-Sender-Auth: F-FyaOoBF2hpjoDR5mRTLU7kHYM Message-ID: From: Dhruv Dhody To: Jonathan Hardwick Content-Type: multipart/alternative; boundary=001a1141bd00167e480512257cb2 Archived-At: Cc: "draft-ietf-pce-segment-routing@tools.ietf.org" , "pce@ietf.org" Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Mar 2015 23:44:51 -0000 --001a1141bd00167e480512257cb2 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable +1, I agree with Jon. Perhaps a new METRIC type for MSD? Regards, Dhruv On Wed, Mar 25, 2015 at 6:23 PM, Jonathan Hardwick < Jonathan.Hardwick@metaswitch.com> wrote: > Hi Jeff > > > > I just wanted to clarify the comment that I made at the mic today as we > seemed to be talking at cross-purposes. > > > > The draft sets a maximum SID depth in the Open message, which effectively > creates an implicit constraint on all queries that are sent over the PCEP > session, such that returned paths must not have a SID stack depth greater > than the MSD. I think this is wrong, and that the MSD should instead be > sent as an explicit constraint on each query. Here is my reasoning. > > > > In the PCE architecture it is wrong to assume that the PCC and the ingres= s > router are the same device. There are at least two cases where it is not= . > > =C2=B7 In some network management architectures, the PCC is a net= work > management tool. The network management tool may have many ingress route= rs > in its jurisdiction, each with a different MSD, so it is not true to say > that the MSD is a constant for the PCC-PCE session. > > =C2=B7 In inter-domain routing there is PCE-PCE communication bet= ween > domains. One of the PCEs plays the role of PCC and is acting on behalf o= f > all edge routers in its domain (or perhaps some domain further upstream). > Again, the MSD is not constant on the PCE-PCE session. > > > > I don=E2=80=99t think that we should rule either of these scenarios out o= f segment > routing, even if they are not the first scenarios that everyone is > targeting. At some point we will want to do them and we do not want to > re-do the work that we are doing today to make them work. > > > > Best regards > > Jon > > > > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce > > --001a1141bd00167e480512257cb2 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
+1, =C2=A0I agree with Jon.=C2=A0

Perha= ps a new METRIC type for MSD?

Regards,
D= hruv =C2=A0=C2=A0

On Wed, Mar 25, 2015 at 6:23 PM, Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com> wrote:

Hi Jeff

=C2=A0

I just wanted to clarify the comment that I made at = the mic today as we seemed to be talking at cross-purposes.

=C2=A0

The draft sets a maximum SID depth in the Open messa= ge, which effectively creates an implicit constraint on all queries that ar= e sent over the PCEP session, such that returned paths must not have a SID = stack depth greater than the MSD.=C2=A0 I think this is wrong, and that the MSD should instead be sent as an expli= cit constraint on each query.=C2=A0 Here is my reasoning.

=C2=A0

In the PCE architecture it is wrong to assume that t= he PCC and the ingress router are the same device.=C2=A0 There are at least= two cases where it is not.

=C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 In some network management architectures, the P= CC is a network management tool.=C2=A0 The network management tool may have= many ingress routers in its jurisdiction, each with a different MSD, so it= is not true to say that the MSD is a constant for the PCC-PCE session.

=C2=B7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 In inter-domain routing there is PCE-PCE commun= ication between domains.=C2=A0 One of the PCEs plays the role of PCC and is= acting on behalf of all edge routers in its domain (or perhaps some domain= further upstream).=C2=A0 Again, the MSD is not constant on the PCE-PCE session.

=C2=A0

I don=E2=80=99t think that we should rule either of = these scenarios out of segment routing, even if they are not the first scen= arios that everyone is targeting.=C2=A0 At some point we will want to do th= em and we do not want to re-do the work that we are doing today to make them work.

=C2=A0

Best regards

Jon

=C2=A0


_______________________________________________
Pce mailing list
Pce@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/pce


--001a1141bd00167e480512257cb2-- From nobody Wed Mar 25 17:00:37 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8A1F11ACCE7 for ; Wed, 25 Mar 2015 17:00:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LNM-oeUeW3wI for ; Wed, 25 Mar 2015 17:00:33 -0700 (PDT) Received: from usevmg20.ericsson.net (usevmg20.ericsson.net [198.24.6.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BB3441A8822 for ; Wed, 25 Mar 2015 17:00:32 -0700 (PDT) X-AuditID: c618062d-f79686d0000030a8-49-5512f6520354 Received: from EUSAAHC003.ericsson.se (Unknown_Domain [147.117.188.81]) by usevmg20.ericsson.net (Symantec Mail Security) with SMTP id 8B.E8.12456.256F2155; Wed, 25 Mar 2015 18:54:26 +0100 (CET) Received: from EUSAAMB109.ericsson.se ([147.117.188.126]) by EUSAAHC003.ericsson.se ([147.117.188.81]) with mapi id 14.03.0210.002; Wed, 25 Mar 2015 20:00:23 -0400 From: Jeff Tantsura To: Dhruv Dhody Thread-Topic: [Pce] Comment on draft-ietf-pce-segment-routing-01 Thread-Index: AdBnUqmGmqdQpQQXQvqi/1kiPeBWRQAJItcA///BQiM= Date: Thu, 26 Mar 2015 00:00:17 +0000 Message-ID: <9F50CB91-9BB1-42A4-B60F-6FC31F746ED8@ericsson.com> References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk>, In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_9F50CB919BB142A4B60F6FC31F746ED8ericssoncom_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpgkeLIzCtJLcpLzFFi42KZXLonUDfom1Cowe6XChbd834yWazaXWnR 06tt0XT/BrsDi8fOWXfZPZYs+cnkcfTmXGaPL5c/swWwRHHZpKTmZJalFunbJXBlHDj5j6Vg vnHF/nMn2RsYZ2h3MXJySAiYSBzcs5UNwhaTuHBvPZDNxSEkcIRR4suC32AJIYHljBIfn1aC 2GwCBhL/vx1nAbFFBNQk2k7tZwdpYBbYwyix9tVSRpCEsIC9xKrP65kgihwk3n28xAhhW0ns OLACLM4ioCpxbs4CZhCbF6j+67SD7BCbpzJKzH76DGwDp0CgxMb1F8CuYAQ67/upNWDNzALi EreezGeCOFtAYsme88wQtqjEy8f/WCFqkiW+r9zGDrFAUOLkzCcsExhFZiFpn4WkbBaSMoi4 gcT7c/OZIWxtiWULX0PZ+hIbv5xlRBZfwMi+ipGjtDi1LDfdyGATIzDKjkmw6e5g3PPS8hCj AAejEg9vwRvBUCHWxLLiytxDjNIcLErivIseHAwREkhPLEnNTk0tSC2KLyrNSS0+xMjEwSnV wKjzxsG0v/BS1uXFN6S+/tBMn5yxIUV29zobJ/aMD08yjx328bp1WVNElHHB2W9+zMnTlN1y q4zv2Ouvu+BX/F46rcdyzayJ8zc4GAqlKOue+rvqfYxz4+9o4eBFmlcDV9xsfrXtC3Pij7Du KWzCAvk3fHe68VwrqXj0OWHnX8kl27VspBereiixFGckGmoxFxUnAgAJOKjbkwIAAA== Archived-At: Cc: "draft-ietf-pce-segment-routing@tools.ietf.org" , "pce@ietf.org" Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 00:00:35 -0000 --_000_9F50CB919BB142A4B60F6FC31F746ED8ericssoncom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I fully agree with the comments and thanks Jon for bringing it up. We will work to address it. Regards, Jeff On Mar 25, 2015, at 6:44 PM, Dhruv Dhody > wrote: +1, I agree with Jon. Perhaps a new METRIC type for MSD? Regards, Dhruv On Wed, Mar 25, 2015 at 6:23 PM, Jonathan Hardwick > wrote: Hi Jeff I just wanted to clarify the comment that I made at the mic today as we see= med to be talking at cross-purposes. The draft sets a maximum SID depth in the Open message, which effectively c= reates an implicit constraint on all queries that are sent over the PCEP se= ssion, such that returned paths must not have a SID stack depth greater tha= n the MSD. I think this is wrong, and that the MSD should instead be sent = as an explicit constraint on each query. Here is my reasoning. In the PCE architecture it is wrong to assume that the PCC and the ingress = router are the same device. There are at least two cases where it is not. =95 In some network management architectures, the PCC is a network = management tool. The network management tool may have many ingress routers= in its jurisdiction, each with a different MSD, so it is not true to say t= hat the MSD is a constant for the PCC-PCE session. =95 In inter-domain routing there is PCE-PCE communication between = domains. One of the PCEs plays the role of PCC and is acting on behalf of = all edge routers in its domain (or perhaps some domain further upstream). = Again, the MSD is not constant on the PCE-PCE session. I don=92t think that we should rule either of these scenarios out of segmen= t routing, even if they are not the first scenarios that everyone is target= ing. At some point we will want to do them and we do not want to re-do the= work that we are doing today to make them work. Best regards Jon _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce --_000_9F50CB919BB142A4B60F6FC31F746ED8ericssoncom_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
I fully agree with the comments and thanks Jon for bringing it up.
We will work to address it.

Regards,
Jeff

On Mar 25, 2015, at 6:44 PM, Dhruv Dhody <dhruv.ietf@gmail.com> wrote:

+1,  I agree with Jon. 

Perhaps a new METRIC type for MSD?

Regards,
Dhruv   

On Wed, Mar 25, 2015 at 6:23 PM, Jonathan Hardwi= ck <J= onathan.Hardwick@metaswitch.com> wrote:

Hi Jeff

 

I just wanted to clarify the comment that I made at = the mic today as we seemed to be talking at cross-purposes.

 

The draft sets a maximum SID depth in the Open messa= ge, which effectively creates an implicit constraint on all queries that ar= e sent over the PCEP session, such that returned paths must not have a SID = stack depth greater than the MSD.  I think this is wrong, and that the MSD should instead be sent as an expli= cit constraint on each query.  Here is my reasoning.

 

In the PCE architecture it is wrong to assume that t= he PCC and the ingress router are the same device.  There are at least= two cases where it is not.

=B7       = ;  In some network management architectures, the P= CC is a network management tool.  The network management tool may have= many ingress routers in its jurisdiction, each with a different MSD, so it= is not true to say that the MSD is a constant for the PCC-PCE session.

=B7       = ;  In inter-domain routing there is PCE-PCE commun= ication between domains.  One of the PCEs plays the role of PCC and is= acting on behalf of all edge routers in its domain (or perhaps some domain= further upstream).  Again, the MSD is not constant on the PCE-PCE session.

 

I don=92t think that we should rule either of these = scenarios out of segment routing, even if they are not the first scenarios = that everyone is targeting.  At some point we will want to do them and= we do not want to re-do the work that we are doing today to make them work.

 

Best regards

Jon

 


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Pce@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/pce


--_000_9F50CB919BB142A4B60F6FC31F746ED8ericssoncom_-- From nobody Wed Mar 25 17:03:27 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4DE2A1A0052 for ; Wed, 25 Mar 2015 17:03:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 07R5hpxNjUXi for ; Wed, 25 Mar 2015 17:03:19 -0700 (PDT) Received: from mail-ig0-x22e.google.com (mail-ig0-x22e.google.com [IPv6:2607:f8b0:4001:c05::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 63A131A006B for ; Wed, 25 Mar 2015 17:03:18 -0700 (PDT) Received: by igcau2 with SMTP id au2so4055262igc.1 for ; Wed, 25 Mar 2015 17:03:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=Bm5n7EhkOjA0XthhtygveFZY6lKauIsuo76ph9MVzX0=; b=a61s0T0vqq72rrTKEyl1+RQC+50xA4SEPXaXnPqn7XwIKekeWMcU+vmSICtbJ2dE23 By2PJ+GlQTQ81GJ63r8ZugfxflKeyHBANqYmWM0OjW0XZYeOlannPheQBvS+1O/7Bywb Eg0/nhrV5/anBjZM7J0OEC48cwTVdB7lVl59hcvLEGMah7S5i3kX8EeiQDNsERqxm7ro XZSqgBbFACQanpM26HOYLH0aisCXsliccCR68eXunurGkX6nX089ZKSalbkSEX6XEQB9 xJ/8eQnPkKqA6b1MiYjlD6LCVQ4BZaiiv+LcmoqpbihLI2HduAYzfAABO4oODyvAYwHA +R5g== MIME-Version: 1.0 X-Received: by 10.50.118.97 with SMTP id kl1mr25854141igb.23.1427328197903; Wed, 25 Mar 2015 17:03:17 -0700 (PDT) Sender: dhruvdhody@gmail.com X-Google-Sender-Delegation: dhruvdhody@gmail.com Received: by 10.50.167.2 with HTTP; Wed, 25 Mar 2015 17:03:17 -0700 (PDT) In-Reply-To: <23CE718903A838468A8B325B80962F9B8704B742@BLREML509-MBX.china.huawei.com> References: <23CE718903A838468A8B325B80962F9B8704B742@BLREML509-MBX.china.huawei.com> Date: Wed, 25 Mar 2015 19:03:17 -0500 X-Google-Sender-Auth: kSlqo0h4924ZLxs2o__cKHmBSDc Message-ID: From: Dhruv Dhody To: Dhruv Dhody Content-Type: multipart/alternative; boundary=089e013a111836c9fd051225becf Archived-At: Cc: "pce@ietf.org" Subject: Re: [Pce] Update to PCE-Yang (draft-pkd-pce-pcep-yang-02) X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 00:03:23 -0000 --089e013a111836c9fd051225becf Content-Type: text/plain; charset=UTF-8 WG, As suggested in the WG session today related to PCEP-Yang, here are few pointers on the next step - (1) Use of Features - Use features for any PCEP extn after RFC 5440 - Look out for optional features in RFC5440 - At the same time should not try to have too many features (2) Stateful PCE as the next step - Some concenses that we should tackle stateful PCE next - Start with the same draft, we can decide to break if the draft becomes too big. (3) Entity-list - Discussion if PCE-Yang should keep entity-list (borrowed from MIB) - Initial opinion is to remove it, please let us know what's your opinion. Please continue to provide us feedback, we plan to make an update soon(ish). Thanks! Dhruv On Tue, Feb 24, 2015 at 12:55 AM, Dhruv Dhody wrote: > Hi, > > Please find an update to the PCE-Yang draft with following changes - > > ~ Support for PCE Information (PCE Discovery Information) > * PCE Path Scope > * PCE Domain > * PCE Neighbor Domain > * PCE Capabilities > ~ Review Comments > * One statistics missed "num-req-rcvd-error-sent" > * Update in Notifications > ~ Security Considerations > ~ Editorial Updates > > See diff at: > http://www.ietf.org/rfcdiff?url1=draft-pkd-pce-pcep-yang-01&url2=draft-pkd-pce-pcep-yang-02 > > Please have a look and provide comments... > > Plan is to start work on stateful PCE Yang next. > > Regards, > Dhruv > > --089e013a111836c9fd051225becf Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
WG,=C2=A0

As suggested in th= e WG session today related to PCEP-Yang, here are few pointers on the next = step - =C2=A0

(1) Use of Features
- Use features for any=C2=A0PCEP= =C2=A0extn after RFC 5440
= - Look out for optional featur= es in RFC5440
- At the same time should not try to have= too many features

(2) Stateful=C2=A0PCE as the next step
- Some conc= enses=C2=A0that we should tackle stateful PCE next
- Sta= rt with the same draft, we can decide to break if the=C2=A0draft becomes too big.

(3) Entity-list
- Discussion if PCE-Yang=C2=A0should keep entity-list (borrowed from = MIB)
- Initial opinion is to remove it, please let us kn= ow what's=C2=A0your opinion.=C2=A0

Please continue to provide us feedback, we= plan to make an update soon(ish). =C2=A0

Thanks!= =C2=A0

Dhruv


On Tue, Feb 24, 2015 at 12:= 55 AM, Dhruv Dhody <dhruv.dhody@huawei.com> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex">Hi,

Please find an update to the PCE-Yang draft with following changes -

~ Support for PCE Information (PCE Discovery Information)
=C2=A0 =C2=A0 =C2=A0 =C2=A0 * PCE Path Scope
=C2=A0 =C2=A0 =C2=A0 =C2=A0 * PCE Domain
=C2=A0 =C2=A0 =C2=A0 =C2=A0 * PCE Neighbor Domain
=C2=A0 =C2=A0 =C2=A0 =C2=A0 * PCE Capabilities
~ Review Comments
=C2=A0 =C2=A0 =C2=A0 =C2=A0 * One statistics missed "num-req-rcvd-erro= r-sent"
=C2=A0 =C2=A0 =C2=A0 =C2=A0 * Update in Notifications
~ Security Considerations
~ Editorial Updates

See diff at: http://= www.ietf.org/rfcdiff?url1=3Ddraft-pkd-pce-pcep-yang-01&url2=3Ddraft-pkd= -pce-pcep-yang-02

Please have a look and provide comments...

Plan is to start work on stateful PCE Yang next.

Regards,
Dhruv


--089e013a111836c9fd051225becf-- From nobody Thu Mar 26 01:30:47 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E9CEF1A88A7 for ; Thu, 26 Mar 2015 01:30:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.598 X-Spam-Level: X-Spam-Status: No, score=-3.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NMLythH3sT9U for ; Thu, 26 Mar 2015 01:30:43 -0700 (PDT) Received: from r-mail1.rd.orange.com (r-mail1.rd.orange.com [217.108.152.41]) by ietfa.amsl.com (Postfix) with ESMTP id 78CE31A0197 for ; Thu, 26 Mar 2015 01:30:42 -0700 (PDT) Received: from r-mail1.rd.orange.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 2507FDE4007; Thu, 26 Mar 2015 09:30:41 +0100 (CET) Received: from FTRDCH01.rd.francetelecom.fr (unknown [10.194.32.11]) by r-mail1.rd.orange.com (Postfix) with ESMTP id 18ACFDE4001; Thu, 26 Mar 2015 09:30:41 +0100 (CET) Received: from [10.193.71.87] (10.193.71.87) by FTRDCH01.rd.francetelecom.fr (10.194.32.11) with Microsoft SMTP Server id 14.3.224.2; Thu, 26 Mar 2015 09:30:40 +0100 Message-ID: <5513C3B0.2060600@orange.com> Date: Thu, 26 Mar 2015 09:30:40 +0100 From: Olivier Dugeon Organization: Orange Labs User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Jonathan Hardwick , Jeff Tantsura References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> In-Reply-To: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> Content-Type: multipart/alternative; boundary="------------080005020604030902090200" Archived-At: Cc: "draft-ietf-pce-segment-routing@tools.ietf.org" , "pce@ietf.org" Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 08:30:46 -0000 --------------080005020604030902090200 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: quoted-printable Hi Jonathan, I agree with you. The MSD is purely a local information attached to the=20 router. To correctly manage this informationfor Segment Path=20 computation, the PCE must be aware of MSD of each router, not only the=20 PE, but also the P routers. So, the best way is to add MSD metric=20 announcement in the router SR capabilities sub-TLV (see e.g.=20 draft-ietf-isis-segment-routing-extensions-03.txt page 23 section 3.1).=20 So that, the PCE get the information in its TEDon a per node basis. Then = it is not necessary to add it in the OPEN message, but eventually, move=20 it on the PCReq/PCInit/PCRept message as a constraint for the SR path=20 computation. Now, the main problem, is who can be in charge to propose this new MSD=20 metric ? PCE WG, SPRING WG or IS-IS/OSPF WG ? Regards, Olivier Le 26/03/2015 00:23, Jonathan Hardwick a =E9crit : > > Hi Jeff > > I just wanted to clarify the comment that I made at the mic today as=20 > we seemed to be talking at cross-purposes. > > The draft sets a maximum SID depth in the Open message, which=20 > effectively creates an implicit constraint on all queries that are=20 > sent over the PCEP session, such that returned paths must not have a=20 > SID stack depth greater than the MSD. I think this is wrong, and that = > the MSD should instead be sent as an explicit constraint on each=20 > query. Here is my reasoning. > > In the PCE architecture it is wrong to assume that the PCC and the=20 > ingress router are the same device. There are at least two cases=20 > where it is not. > > =B7In some network management architectures, the PCC is a network=20 > management tool. The network management tool may have many ingress=20 > routers in its jurisdiction, each with a different MSD, so it is not=20 > true to say that the MSD is a constant for the PCC-PCE session. > > =B7In inter-domain routing there is PCE-PCE communication between=20 > domains. One of the PCEs plays the role of PCC and is acting on=20 > behalf of all edge routers in its domain (or perhaps some domain=20 > further upstream). Again, the MSD is not constant on the PCE-PCE sessi= on. > > I don=92t think that we should rule either of these scenarios out of=20 > segment routing, even if they are not the first scenarios that=20 > everyone is targeting. At some point we will want to do them and we=20 > do not want to re-do the work that we are doing today to make them work= =2E > > Best regards > > Jon > > > > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce --------------080005020604030902090200 Content-Type: text/html; charset="windows-1252" Content-Transfer-Encoding: quoted-printable Hi Jonathan,

I agree with you. The MSD is purely a local information attached to the router. To correctly manage this information for Segment Path computation, the PCE must be= aware of MSD of each router, not only the PE, but also the P routers. So, the best way is to add MSD= metric announcement in the router SR capabilities sub-TLV (see e.g. draft-ietf-isis-segment-routing-extensions-03.txt page 23 section 3.1). So that, the PCE get the information in its TED on a= per node basis. Then it is not necessary to add it in the OPEN message, but eventually, move it on the PCReq/PCInit/PCRept message as a const= raint for the SR path computation.

Now, the main problem, is who can be in charge to propose this new MSD metric ? PCE WG, SPRING WG or IS-IS/OSPF WG ?

Regards,

Olivier
=
Le 26/03/2015 00:23, Jonathan Hardwick= a =E9crit=A0:

Hi Jeff

=A0

I just wanted to clarify the comment that = I made at the mic today as we seemed to be talking at cross-purposes.

=A0

The draft sets a maximum SID depth in the Open message, which effectively creates an implicit constraint on all queries that are sent over the PCEP session, such that returned paths must not have a SID stack depth greater than the MSD.=A0 I think this is wrong, and that the MSD should instead be sent as an explicit constraint on each query.=A0 Her= e is my reasoning.

=A0

In the PCE architecture it is wrong to assume that the PCC and the ingress router are the same device.=A0 There are at least two cases where it is not.

= =B7=A0=A0=A0= =A0=A0=A0=A0=A0 In some network management architectures, the PCC is a network management tool.=A0 The network management tool may have many ingress routers in its jurisdiction, each with a different MSD, so it is not true to say that the MSD is a constant for the PCC-PCE session.

= =B7=A0=A0=A0= =A0=A0=A0=A0=A0 In inter-domain routing there is PCE-PCE communication between domains.=A0 One of the PCEs plays the role of PCC and is acting on behalf of all edge routers in its domain (or perhaps some domain further upstream).=A0 Again, the MSD is not constant on the PCE-PCE session.

=A0

I don=92t think that we should rule either= of these scenarios out of segment routing, even if they are not the first scenarios that everyone is targeting.=A0 At some poin= t we will want to do them and we do not want to re-do the work that we are doing today to make them work.

=A0

Best regards

Jon

=A0



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--------------080005020604030902090200-- From nobody Thu Mar 26 04:18:17 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F0AA01B2C5E for ; Thu, 26 Mar 2015 04:18:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mb32CXAO1Gsy for ; Thu, 26 Mar 2015 04:18:09 -0700 (PDT) Received: from relais-inet.francetelecom.com (relais-ias244.francetelecom.com [80.12.204.244]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F0F621ACE40 for ; Thu, 26 Mar 2015 04:18:08 -0700 (PDT) Received: from omfeda08.si.francetelecom.fr (unknown [xx.xx.xx.201]) by omfeda14.si.francetelecom.fr (ESMTP service) with ESMTP id 0C22B2AC375; Thu, 26 Mar 2015 12:18:07 +0100 (CET) Received: from Exchangemail-eme2.itn.ftgroup (unknown [10.114.31.66]) by omfeda08.si.francetelecom.fr (ESMTP service) with ESMTP id DED393840BD; Thu, 26 Mar 2015 12:18:06 +0100 (CET) Received: from OPEXCLILM43.corporate.adroot.infra.ftgroup ([169.254.4.86]) by OPEXCLILMA1.corporate.adroot.infra.ftgroup ([fe80::95e2:eb4b:3053:fabf%19]) with mapi id 14.03.0224.002; Thu, 26 Mar 2015 12:18:01 +0100 From: To: DUGEON Olivier IMT/OLN , Jonathan Hardwick , Jeff Tantsura Thread-Topic: [Pce] Comment on draft-ietf-pce-segment-routing-01 Thread-Index: AdBnUqmGmqdQpQQXQvqi/1kiPeBWRQARBj8AAAXYnnA= Date: Thu, 26 Mar 2015 11:18:01 +0000 Message-ID: <26984_1427368686_5513EAEE_26984_1142_1_f953b647-329b-4275-9f95-45dc13fc5cdd@OPEXCLILMA1.corporate.adroot.infra.ftgroup> References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> <5513C3B0.2060600@orange.com> In-Reply-To: <5513C3B0.2060600@orange.com> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.5] Content-Type: multipart/alternative; boundary="_000_f953b647329b42759f9545dc13fc5cddOPEXCLILMA1corporateadr_" MIME-Version: 1.0 X-PMX-Version: 6.2.1.2478543, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.2.12.3031 Archived-At: Cc: "pce@ietf.org" , "draft-ietf-pce-segment-routing@tools.ietf.org" Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 11:18:14 -0000 --_000_f953b647329b42759f9545dc13fc5cddOPEXCLILMA1corporateadr_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I totally agree with Olivier and Jonathan on this. to encompass all the varieties of PCE/PCC architectures, the MSD should be = considered as additional constraint by the path computation engine just lik= e the BANDWIDTH, the only scenario I can think of where the MSD must be announced by the PCC= is inter-PCE collaboration and the right place would be for it is PCReq. I Agree with Olivier a support his proposition. considering only the PCC MSD and not the intermediate nodes by the path com= putation engine will result in paths that don't behave as expected, (specia= lly for load balancing in a loose path scenario ),the PCE must have in its TED all the MSDs of all= the nodes (PE and P) in its domain, therefore the MSD should advertised by= the IGP (OSPF, ISIS, BGP-LS) just like the SRLGs, where the path computation engine will conside= r the MSDs of the ingress and intermediate to compute the path. Best regards, GUEDREZ Rabah De : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon Envoy=E9 : jeudi 26 mars 2015 09:31 =C0 : Jonathan Hardwick; Jeff Tantsura Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi Jonathan, I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR= capabilities sub-TLV (see e.g. draft-ietf-isis-segment-routing-extensions-= 03.txt page 23 section 3.1). So that, the PCE get the information in its TE= D on a per node basis. Then it is not necessary to add it in the OPEN messa= ge, but eventually, move it on the PCReq/PCInit/PCRept message as a constra= int for the SR path computation. Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ? Regards, Olivier Le 26/03/2015 00:23, Jonathan Hardwick a =E9crit : Hi Jeff I just wanted to clarify the comment that I made at the mic today as we see= med to be talking at cross-purposes. The draft sets a maximum SID depth in the Open message, which effectively c= reates an implicit constraint on all queries that are sent over the PCEP se= ssion, such that returned paths must not have a SID stack depth greater tha= n the MSD. I think this is wrong, and that the MSD should instead be sent = as an explicit constraint on each query. Here is my reasoning. In the PCE architecture it is wrong to assume that the PCC and the ingress = router are the same device. There are at least two cases where it is not. =B7 In some network management architectures, the PCC is a network = management tool. The network management tool may have many ingress routers= in its jurisdiction, each with a different MSD, so it is not true to say t= hat the MSD is a constant for the PCC-PCE session. =B7 In inter-domain routing there is PCE-PCE communication between = domains. One of the PCEs plays the role of PCC and is acting on behalf of = all edge routers in its domain (or perhaps some domain further upstream). = Again, the MSD is not constant on the PCE-PCE session. I don't think that we should rule either of these scenarios out of segment = routing, even if they are not the first scenarios that everyone is targetin= g. At some point we will want to do them and we do not want to re-do the w= ork that we are doing today to make them work. Best regards Jon _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_f953b647329b42759f9545dc13fc5cddOPEXCLILMA1corporateadr_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,=

I totally agre= e with Olivier and Jonathan on this.

to encompass a= ll the varieties of PCE/PCC architectures, the MSD should be considered as = additional constraint by the path computation engine just like the BANDWIDTH,

the only scena= rio I can think of where the MSD must be announced by the PCC is inter-PCE = collaboration and the right place would be for it is PCReq.

 

 

I Agree with O= livier a support his proposition.

considering on= ly the PCC MSD and not the intermediate nodes by the path computation engin= e will result in paths that don’t behave as expected, (specially for load balancing

in a loose pat= h scenario ),the PCE must have in its TED all the MSDs of all the nodes (PE= and P) in its domain, therefore the MSD should advertised by the IGP (OSPF, ISIS,

BGP-LS) just l= ike the SRLGs, where the path computation engine will consider  the &n= bsp;MSDs of the ingress and intermediate to compute the path.

 

 

 

Best regards,<= o:p>

GUEDREZ Rabah<= o:p>

 

De := Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon
Envoy=E9 : jeudi 26 mars 2015 09:31
=C0 : Jonathan Hardwick; Jeff Tantsura
Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.or= g
Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01<= o:p>

 

Hi Jonathan,

I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR capabilities sub-TLV (see e.g. dr= aft-ietf-isis-segment-routing-extensions-03.txt page 23 section 3.1). So th= at, the PCE get the information in its TED on a per node basis. Then it is = not necessary to add it in the OPEN message, but eventually, move it on the PCReq/PCInit/PCRept message as a c= onstraint for the SR path computation.

Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ?

Regards,

Olivier

Le 26/03/2015 00:23, Jonathan Hardwick a =E9crit&nbs= p;:

Hi Jeff

 

I just wanted to clarify the comment that I made at = the mic today as we seemed to be talking at cross-purposes.

 

The draft sets a maximum SID depth in the Open messa= ge, which effectively creates an implicit constraint on all queries that ar= e sent over the PCEP session, such that returned paths must not have a SID = stack depth greater than the MSD.  I think this is wrong, and that the MSD should instead be sent as an expli= cit constraint on each query.  Here is my reasoning.

 

In the PCE architecture it is wrong to assume that t= he PCC and the ingress router are the same device.  There are at least= two cases where it is not.

=B7         In some network management architectures, th= e PCC is a network management tool.  The network management tool may h= ave many ingress routers in its jurisdiction, each with a different MSD, so= it is not true to say that the MSD is a constant for the PCC-PCE session.

=B7         In inter-domain routing there is PCE-PCE com= munication between domains.  One of the PCEs plays the role of PCC and= is acting on behalf of all edge routers in its domain (or perhaps some dom= ain further upstream).  Again, the MSD is not constant on the PCE-PCE session.

 

I don’t think that we should rule either of th= ese scenarios out of segment routing, even if they are not the first scenar= ios that everyone is targeting.  At some point we will want to do them= and we do not want to re-do the work that we are doing today to make them work.

 

Best regards

Jon

 




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

 

______________________________________________________________________=
___________________________________________________

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ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
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Thank you.
--_000_f953b647329b42759f9545dc13fc5cddOPEXCLILMA1corporateadr_-- From nobody Thu Mar 26 06:24:50 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2333D1B2D53 for ; Thu, 26 Mar 2015 06:24:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.61 X-Spam-Level: X-Spam-Status: No, score=-2.61 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qzINTSxrlkSk for ; Thu, 26 Mar 2015 06:24:40 -0700 (PDT) Received: from ENFICSETS1.metaswitch.com (enficsets1.metaswitch.com [192.91.191.38]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6C88D1A8A58 for ; Thu, 26 Mar 2015 06:24:39 -0700 (PDT) Received: from ENFICSCAS1.datcon.co.uk (172.18.10.61) by ENFICSETS1.metaswitch.com (172.18.4.18) with Microsoft SMTP Server (TLS) id 14.3.224.2; Thu, 26 Mar 2015 13:24:31 +0000 Received: from ENFICSMBX1.datcon.co.uk ([fe80::d5d5:c683:a3be:3a19]) by ENFICSCAS1.datcon.co.uk ([fe80::3d12:12a9:26af:c7%11]) with mapi id 14.03.0224.002; Thu, 26 Mar 2015 13:24:37 +0000 From: Jonathan Hardwick To: "rabah.guedrez@orange.com" , "DUGEON Olivier IMT/OLN" Thread-Topic: [Pce] Comment on draft-ietf-pce-segment-routing-01 Thread-Index: AdBnUqmGmqdQpQQXQvqi/1kiPeBWRQATHrAAAAXYOoAAA9vs0A== Date: Thu, 26 Mar 2015 13:24:37 +0000 Message-ID: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3@ENFICSMBX1.datcon.co.uk> References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> <5513C3B0.2060600@orange.com> <26984_1427368686_5513EAEE_26984_1142_1_f953b647-329b-4275-9f95-45dc13fc5cdd@OPEXCLILMA1.corporate.adroot.infra.ftgroup> In-Reply-To: <26984_1427368686_5513EAEE_26984_1142_1_f953b647-329b-4275-9f95-45dc13fc5cdd@OPEXCLILMA1.corporate.adroot.infra.ftgroup> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.28.4.12] Content-Type: multipart/alternative; boundary="_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3ENFICSMBX1dat_" MIME-Version: 1.0 Archived-At: Cc: "pce@ietf.org" , "draft-ietf-pce-segment-routing@tools.ietf.org" Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 13:24:48 -0000 --_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3ENFICSMBX1dat_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Olivier, Rabah, Please could you clarify something for me? I'm not sure that the MSD of th= e intermediate nodes has the same significance as the MSD of the ingress no= de. My understanding is that the ingress node is often limited by hardware= in the maximum depth of the SID stack that it can push onto each packet. = The intermediate nodes do not have to push SIDs - I thought that they would= just route on the top-most SID in the stack and sometimes remove the top-m= ost SID from the stack. If that's true then the MSD path constraint does n= ot apply to them. Have I misunderstood? Best regards Jon From: rabah.guedrez@orange.com [mailto:rabah.guedrez@orange.com] Sent: 26 March 2015 06:18 To: DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Subject: RE: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi, I totally agree with Olivier and Jonathan on this. to encompass all the varieties of PCE/PCC architectures, the MSD should be = considered as additional constraint by the path computation engine just lik= e the BANDWIDTH, the only scenario I can think of where the MSD must be announced by the PCC= is inter-PCE collaboration and the right place would be for it is PCReq. I Agree with Olivier a support his proposition. considering only the PCC MSD and not the intermediate nodes by the path com= putation engine will result in paths that don't behave as expected, (specia= lly for load balancing in a loose path scenario ),the PCE must have in its TED all the MSDs of all= the nodes (PE and P) in its domain, therefore the MSD should advertised by= the IGP (OSPF, ISIS, BGP-LS) just like the SRLGs, where the path computation engine will conside= r the MSDs of the ingress and intermediate to compute the path. Best regards, GUEDREZ Rabah De : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon Envoy=E9 : jeudi 26 mars 2015 09:31 =C0 : Jonathan Hardwick; Jeff Tantsura Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi Jonathan, I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR= capabilities sub-TLV (see e.g. draft-ietf-isis-segment-routing-extensions-= 03.txt page 23 section 3.1). So that, the PCE get the information in its TE= D on a per node basis. Then it is not necessary to add it in the OPEN messa= ge, but eventually, move it on the PCReq/PCInit/PCRept message as a constra= int for the SR path computation. Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ? Regards, Olivier Le 26/03/2015 00:23, Jonathan Hardwick a =E9crit : Hi Jeff I just wanted to clarify the comment that I made at the mic today as we see= med to be talking at cross-purposes. The draft sets a maximum SID depth in the Open message, which effectively c= reates an implicit constraint on all queries that are sent over the PCEP se= ssion, such that returned paths must not have a SID stack depth greater tha= n the MSD. I think this is wrong, and that the MSD should instead be sent = as an explicit constraint on each query. Here is my reasoning. In the PCE architecture it is wrong to assume that the PCC and the ingress = router are the same device. There are at least two cases where it is not. =B7 In some network management architectures, the PCC is a network = management tool. The network management tool may have many ingress routers= in its jurisdiction, each with a different MSD, so it is not true to say t= hat the MSD is a constant for the PCC-PCE session. =B7 In inter-domain routing there is PCE-PCE communication between = domains. One of the PCEs plays the role of PCC and is acting on behalf of = all edge routers in its domain (or perhaps some domain further upstream). = Again, the MSD is not constant on the PCE-PCE session. I don't think that we should rule either of these scenarios out of segment = routing, even if they are not the first scenarios that everyone is targetin= g. At some point we will want to do them and we do not want to re-do the w= ork that we are doing today to make them work. Best regards Jon _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3ENFICSMBX1dat_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Olivier, Rabah,

 

Please could you clari= fy something for me?  I’m not sure that the MSD of the intermedi= ate nodes has the same significance as the MSD of the ingress node.  M= y understanding is that the ingress node is often limited by hardware in the maximum depth of the SID stack that it can push onto ea= ch packet.  The intermediate nodes do not have to push SIDs – I = thought that they would just route on the top-most SID in the stack and som= etimes remove the top-most SID from the stack.  If that’s true then the MSD path constraint does not apply to them.&= nbsp; Have I misunderstood?

 

Best regards

Jon<= /p>

 

 

From:= rabah.guedrez@orang= e.com [mailto:rabah.guedrez@orange.com]
Sent: 26 March 2015 06:18
To: DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura
Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Subject: RE: [Pce] Comment on draft-ietf-pce-segment-routing-01=

 

Hi,

I totally agree with Olivi= er and Jonathan on this.

to encompass all the varie= ties of PCE/PCC architectures, the MSD should be considered as additional c= onstraint by the path computation engine just like the BANDWIDTH,

the only scenario I can th= ink of where the MSD must be announced by the PCC is inter-PCE collaboratio= n and the right place would be for it is PCReq.

 

 

I Agree with Olivier a sup= port his proposition.

considering only the PCC M= SD and not the intermediate nodes by the path computation engine will resul= t in paths that don’t behave as expected, (specially for load balancing

in a loose path scenario )= ,the PCE must have in its TED all the MSDs of all the nodes (PE and P) in i= ts domain, therefore the MSD should advertised by the IGP (OSPF, ISIS,

BGP-LS) just like the SRLG= s, where the path computation engine will consider  the  MSDs of = the ingress and intermediate to compute the path.

 

 

 

Best regards,

GUEDREZ Rabah

 

De = : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon
Envoy=E9 : jeudi 26 mars 2015 09:31
=C0 : Jonathan Hardwick; Jeff Tantsura
Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01<= o:p>

 

Hi Jonathan,

I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR capabilities sub-TLV (see e.g. dr= aft-ietf-isis-segment-routing-extensions-03.txt page 23 section 3.1). So th= at, the PCE get the information in its TED on a per node basis. Then it is = not necessary to add it in the OPEN message, but eventually, move it on the PCReq/PCInit/PCRept message as a c= onstraint for the SR path computation.

Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ?

Regards,

Olivier

Le 26/03/2015 00:23, Jonathan Hard= wick a =E9crit :

Hi Jeff

 

I just wanted to clarify the comme= nt that I made at the mic today as we seemed to be talking at cross-purpose= s.

 

The draft sets a maximum SID depth= in the Open message, which effectively creates an implicit constraint on a= ll queries that are sent over the PCEP session, such that returned paths mu= st not have a SID stack depth greater than the MSD.  I think this is wrong, and that the MSD should instead= be sent as an explicit constraint on each query.  Here is my reasonin= g.

 

In the PCE architecture it is wron= g to assume that the PCC and the ingress router are the same device.  = There are at least two cases where it is not.

=B7         In some network management= architectures, the PCC is a network management tool.  The network man= agement tool may have many ingress routers in its jurisdiction, each with a= different MSD, so it is not true to say that the MSD is a constant for the PCC-PCE session.

=B7         In inter-domain routing th= ere is PCE-PCE communication between domains.  One of the PCEs plays t= he role of PCC and is acting on behalf of all edge routers in its domain (o= r perhaps some domain further upstream).  Again, the MSD is not constant on the PCE-PCE session.

 

I don’t think that we should= rule either of these scenarios out of segment routing, even if they are no= t the first scenarios that everyone is targeting.  At some point we wi= ll want to do them and we do not want to re-do the work that we are doing today to make them work.

 

Best regards

Jon

 



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--_000_09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3ENFICSMBX1dat_-- From nobody Thu Mar 26 06:46:14 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 139C51B2CC9 for ; Thu, 26 Mar 2015 06:46:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.858 X-Spam-Level: X-Spam-Status: No, score=-3.858 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HELO_EQ_FR=0.35, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, T_RP_MATCHES_RCVD=-0.01] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mLTlA_Wrk5wX for ; Thu, 26 Mar 2015 06:46:07 -0700 (PDT) Received: from r-mail1.rd.orange.com (r-mail1.rd.orange.com [217.108.152.41]) by ietfa.amsl.com (Postfix) with ESMTP id DB0EC1B2D53 for ; Thu, 26 Mar 2015 06:46:06 -0700 (PDT) Received: from r-mail1.rd.orange.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 7FA9CDE4002; Thu, 26 Mar 2015 14:46:05 +0100 (CET) Received: from FTRDCH01.rd.francetelecom.fr (unknown [10.194.32.11]) by r-mail1.rd.orange.com (Postfix) with ESMTP id 6FEE7DE4001; Thu, 26 Mar 2015 14:46:05 +0100 (CET) Received: from renot.rd.francetelecom.fr (10.193.7.35) by FTRDCH01.rd.francetelecom.fr (10.194.32.11) with Microsoft SMTP Server id 14.3.224.2; Thu, 26 Mar 2015 14:46:04 +0100 Message-ID: <55140D9C.1090602@orange.com> Date: Thu, 26 Mar 2015 14:46:04 +0100 From: Olivier Dugeon User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Jonathan Hardwick , "rabah.guedrez@orange.com" References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> <5513C3B0.2060600@orange.com> <26984_1427368686_5513EAEE_26984_1142_1_f953b647-329b-4275-9f95-45dc13fc5cdd@OPEXCLILMA1.corporate.adroot.infra.ftgroup> <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3@ENFICSMBX1.datcon.co.uk> In-Reply-To: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3@ENFICSMBX1.datcon.co.uk> Content-Type: multipart/alternative; boundary="------------020203060007090003000300" Archived-At: Cc: "pce@ietf.org" , "draft-ietf-pce-segment-routing@tools.ietf.org" Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 13:46:12 -0000 --------------020203060007090003000300 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 8bit Hello Jon, Yes you agree. From the pure Segment Routing and MPLS point of view. Now, looking to load balancing, it is quiet different. When you setup LAG or Load Balancing, the router perform a hash on the packet header to determine on which interface to send the packet. In general, the has allow a router to send all packets that belongs to the same session goes to the same interface / path. Now, some hardware limitation impose a limitation on the size of the label stack in order to continue to operate the hash function on the IP header located after the label stack. In the label stack is too huge, the hash function will operate across the beginning of the IP header and the end of label stack resulting on non optimal session segregation. In some case it could not be acceptable and lead into problem from an operational point of view. For example, it could cause some packets de-ordering (packets of the same session not follow the same path) that could be not supported by some application e.g. VoIP. So, if for example a PE router accept a MSD of 10 labels and a P router accept a MSD of 5 labels, the computed SR path must take into account that when reaching the P router, le Segment packet must not have a label stack greater than 5 (or 6 depending if the hash is perform before or after the POP operation). Hope this clarify our requests. Regards Olivier Le 26/03/2015 14:24, Jonathan Hardwick a écrit : > > Olivier, Rabah, > > Please could you clarify something for me? I’m not sure that the MSD > of the intermediate nodes has the same significance as the MSD of the > ingress node. My understanding is that the ingress node is often > limited by hardware in the maximum depth of the SID stack that it can > push onto each packet. The intermediate nodes do not have to push > SIDs – I thought that they would just route on the top-most SID in the > stack and sometimes remove the top-most SID from the stack. If that’s > true then the MSD path constraint does not apply to them. Have I > misunderstood? > > Best regards > > Jon > > *From:*rabah.guedrez@orange.com [mailto:rabah.guedrez@orange.com] > *Sent:* 26 March 2015 06:18 > *To:* DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura > *Cc:* draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org > *Subject:* RE: [Pce] Comment on draft-ietf-pce-segment-routing-01 > > Hi, > > I totally agree with Olivier and Jonathan on this. > > to encompass all the varieties of PCE/PCC architectures, the MSD > should be considered as additional constraint by the path computation > engine just like the BANDWIDTH, > > the only scenario I can think of where the MSD must be announced by > the PCC is inter-PCE collaboration and the right place would be for it > is PCReq. > > I Agree with Olivier a support his proposition. > > considering only the PCC MSD and not the intermediate nodes by the > path computation engine will result in paths that don’t behave as > expected, (specially for load balancing > > in a loose path scenario ),the PCE must have in its TED all the MSDs > of all the nodes (PE and P) in its domain, therefore the MSD should > advertised by the IGP (OSPF, ISIS, > > BGP-LS) just like the SRLGs, where the path computation engine will > consider the MSDs of the ingress and intermediate to compute the path. > > Best regards, > > GUEDREZ Rabah > > *De :*Pce [mailto:pce-bounces@ietf.org] *De la part de* Olivier Dugeon > *Envoyé :* jeudi 26 mars 2015 09:31 > *À :* Jonathan Hardwick; Jeff Tantsura > *Cc :* draft-ietf-pce-segment-routing@tools.ietf.org > ; pce@ietf.org > > *Objet :* Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 > > Hi Jonathan, > > I agree with you. The MSD is purely a local information attached to > the router. To correctly manage this information for Segment Path > computation, the PCE must be aware of MSD of each router, not only the > PE, but also the P routers. So, the best way is to add MSD metric > announcement in the router SR capabilities sub-TLV (see e.g. > draft-ietf-isis-segment-routing-extensions-03.txt page 23 section > 3.1). So that, the PCE get the information in its TED on a per node > basis. Then it is not necessary to add it in the OPEN message, but > eventually, move it on the PCReq/PCInit/PCRept message as a constraint > for the SR path computation. > > Now, the main problem, is who can be in charge to propose this new MSD > metric ? PCE WG, SPRING WG or IS-IS/OSPF WG ? > > Regards, > > Olivier > > Le 26/03/2015 00:23, Jonathan Hardwick a écrit : > > Hi Jeff > > I just wanted to clarify the comment that I made at the mic today > as we seemed to be talking at cross-purposes. > > The draft sets a maximum SID depth in the Open message, which > effectively creates an implicit constraint on all queries that are > sent over the PCEP session, such that returned paths must not have > a SID stack depth greater than the MSD. I think this is wrong, > and that the MSD should instead be sent as an explicit constraint > on each query. Here is my reasoning. > > In the PCE architecture it is wrong to assume that the PCC and the > ingress router are the same device. There are at least two cases > where it is not. > > ·In some network management architectures, the PCC is a network > management tool. The network management tool may have many > ingress routers in its jurisdiction, each with a different MSD, so > it is not true to say that the MSD is a constant for the PCC-PCE > session. > > ·In inter-domain routing there is PCE-PCE communication between > domains. One of the PCEs plays the role of PCC and is acting on > behalf of all edge routers in its domain (or perhaps some domain > further upstream). Again, the MSD is not constant on the PCE-PCE > session. > > I don’t think that we should rule either of these scenarios out of > segment routing, even if they are not the first scenarios that > everyone is targeting. At some point we will want to do them and > we do not want to re-do the work that we are doing today to make > them work. > > Best regards > > Jon > > > > _______________________________________________ > > Pce mailing list > > Pce@ietf.org > > https://www.ietf.org/mailman/listinfo/pce > > _________________________________________________________________________________________________________________________ > > Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. > > This message and its attachments may contain confidential or privileged information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and delete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. > Thank you. -- logo Orange Olivier Dugeon Senior research engineer in QoS and network control Open Source Referent Orange/IMT/OLN/WTC/IEE/OPEN fixe : +33 2 96 07 28 80 mobile : +33 6 82 90 37 85 olivier.dugeon@orange.com --------------020203060007090003000300 Content-Type: multipart/related; boundary="------------080007020502080904090309" --------------080007020502080904090309 Content-Type: text/html; charset="windows-1252" Content-Transfer-Encoding: 8bit Hello Jon,

Yes you agree. From the pure Segment Routing and MPLS point of view. Now, looking to load balancing, it is quiet different. When you setup LAG or Load Balancing, the router perform a hash on the packet header to determine on which interface to send the packet. In general, the has allow a router to send all packets that belongs to the same session goes to the same interface / path. Now, some hardware limitation impose a limitation on the size of the label stack in order to continue to operate the hash function on the IP header located after the label stack. In the label stack is too huge, the hash function will operate across the beginning of the IP header and the end of label stack resulting on non optimal session segregation. In some case it could not be acceptable and lead into problem from an operational point of view. For example, it could cause some packets de-ordering (packets of the same session not follow the same path) that could be not supported by some application e.g. VoIP.

So, if for example a PE router accept a MSD of 10 labels and a P router accept a MSD of 5 labels, the computed SR path must take into account that when reaching the P router, le Segment packet must not have a label stack greater than 5 (or 6 depending if the hash is perform before or after the POP operation).

Hope this clarify our requests.

Regards

Olivier

Le 26/03/2015 14:24, Jonathan Hardwick a écrit :

Olivier, Rabah,

 

Please could you clarify something for me?  I’m not sure that the MSD of the intermediate nodes has the same significance as the MSD of the ingress node.  My understanding is that the ingress node is often limited by hardware in the maximum depth of the SID stack that it can push onto each packet.  The intermediate nodes do not have to push SIDs – I thought that they would just route on the top-most SID in the stack and sometimes remove the top-most SID from the stack.  If that’s true then the MSD path constraint does not apply to them.  Have I misunderstood?

 

Best regards

Jon

 

 

From: rabah.guedrez@orange.com [mailto:rabah.guedrez@orange.com]
Sent: 26 March 2015 06:18
To: DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura
Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Subject: RE: [Pce] Comment on draft-ietf-pce-segment-routing-01

 

Hi,

I totally agree with Olivier and Jonathan on this.

to encompass all the varieties of PCE/PCC architectures, the MSD should be considered as additional constraint by the path computation engine just like the BANDWIDTH,

the only scenario I can think of where the MSD must be announced by the PCC is inter-PCE collaboration and the right place would be for it is PCReq.

 

 

I Agree with Olivier a support his proposition.

considering only the PCC MSD and not the intermediate nodes by the path computation engine will result in paths that don’t behave as expected, (specially for load balancing

in a loose path scenario ),the PCE must have in its TED all the MSDs of all the nodes (PE and P) in its domain, therefore the MSD should advertised by the IGP (OSPF, ISIS,

BGP-LS) just like the SRLGs, where the path computation engine will consider  the  MSDs of the ingress and intermediate to compute the path.

 

 

 

Best regards,

GUEDREZ Rabah

 

De : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon
Envoyé : jeudi 26 mars 2015 09:31
À : Jonathan Hardwick; Jeff Tantsura
Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01

 

Hi Jonathan,

I agree with you. The MSD is purely a local information attached to the router. To correctly manage this information for Segment Path computation, the PCE must be aware of MSD of each router, not only the PE, but also the P routers. So, the best way is to add MSD metric announcement in the router SR capabilities sub-TLV (see e.g. draft-ietf-isis-segment-routing-extensions-03.txt page 23 section 3.1). So that, the PCE get the information in its TED on a per node basis. Then it is not necessary to add it in the OPEN message, but eventually, move it on the PCReq/PCInit/PCRept message as a constraint for the SR path computation.

Now, the main problem, is who can be in charge to propose this new MSD metric ? PCE WG, SPRING WG or IS-IS/OSPF WG ?

Regards,

Olivier

Le 26/03/2015 00:23, Jonathan Hardwick a écrit :

Hi Jeff

 

I just wanted to clarify the comment that I made at the mic today as we seemed to be talking at cross-purposes.

 

The draft sets a maximum SID depth in the Open message, which effectively creates an implicit constraint on all queries that are sent over the PCEP session, such that returned paths must not have a SID stack depth greater than the MSD.  I think this is wrong, and that the MSD should instead be sent as an explicit constraint on each query.  Here is my reasoning.

 

In the PCE architecture it is wrong to assume that the PCC and the ingress router are the same device.  There are at least two cases where it is not.

·         In some network management architectures, the PCC is a network management tool.  The network management tool may have many ingress routers in its jurisdiction, each with a different MSD, so it is not true to say that the MSD is a constant for the PCC-PCE session.

·         In inter-domain routing there is PCE-PCE communication between domains.  One of the PCEs plays the role of PCC and is acting on behalf of all edge routers in its domain (or perhaps some domain further upstream).  Again, the MSD is not constant on the PCE-PCE session.

 

I don’t think that we should rule either of these scenarios out of segment routing, even if they are not the first scenarios that everyone is targeting.  At some point we will want to do them and we do not want to re-do the work that we are doing today to make them work.

 

Best regards

Jon

 



_______________________________________________
Pce mailing list
Pce@ietf.org
https://www.ietf.org/mailman/listinfo/pce

 

_________________________________________________________________________________________________________________________
 
Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
 
This message and its attachments may contain confidential or privileged information that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and delete this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.
Thank you.

--
logo Orange

 

Olivier Dugeon
Senior research engineer in QoS and network control
Open Source Referent
Orange/IMT/OLN/WTC/IEE/OPEN

 

fixe : +33 2 96 07 28 80
mobile : +33 6 82 90 37 85
olivier.dugeon@orange.com

 

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Thu, 26 Mar 2015 14:54:57 GMT From: "Adrian Farrel" To: "'Jonathan Hardwick'" , "'Jeff Tantsura'" References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> In-Reply-To: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> Date: Thu, 26 Mar 2015 14:54:54 -0000 Message-ID: <013001d067d4$d38179f0$7a846dd0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_0131_01D067D4.D383EAF0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJVVVae6AhUn2OHluad69wc27KJuZwk/azg Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1576-7.5.0.1018-21426.006 X-TM-AS-Result: No--22.588-10.0-31-10 X-imss-scan-details: No--22.588-10.0-31-10 X-TMASE-MatchedRID: IeZYkn8zfFro2d3orePV3QCwcUB5CbVqQKuv8uQBDjp9Q5/gynnG1k/3 ZkXeY1OAE4S6t8SR7c0xqwEH5YWd/UwaCiVc1jvCUWDKbJeCAy0UkWvaqUqLH8IPenBGRWaGWKo DKTsuRuSRlEHgy3tZPy4WH92W8vxjY5XSvKIG2UiyBjDX4sGuTaKaxHqGRwkCAOrNpiFyN5DUcQ 1+TZ0zBdsS8NxMSxpUrQqYEv1AiGZgNTke+eoi1wRH1Nr7oERdlnrMq7Sriu0FMFLXJ9yPlHEJ8 hKuM/+zQHbFKjveGPHYBbVkA+ea39Befqsuc8HMW7gz/Gbgpl7fVqwz+Cynace0H7LMCFcVwRq4 tsfhpByVu5TRVGSDEdtaN8VSEQvzw1hXve9gEVCO0rt0LpQGeRSpYqhygmjp6ygMMToK892nhZy bKoFsXH++QeBKXAnN4F7lBGYh+K8/Btxv8I1Q6XC8PJ2EFS7IIBcsXIuEvlbkZ1myTXKoFyqh5c Uye3iVIm6fKcuFyK8oR0K3DJ8mwtZXwwpvfhGVFlT/KggLyj0lWygvtTclwOKYpwtG+wHVRq7Na FmiCIDOQf/S1XvtEBm20HYf5Ey/Ja+FAG1BTBO6kMgL3jbYOtMxD/3e8TxdRtqpRW8sWyJqRyrZ EAcpyk5h3PlBkL5K9Oswsnn5skgUhfC/ipzRk6WEP0jL4hXDrrEvQogcy/EdI0m0WP5vehUv9fh geasGaFhW6nb5Y2+9iPZCW+IamjckKevf5t5NnQrZDK7DrTqZEoWHC6Rh/WTNuWQFsA2GYBBGfc v6WOGNIndKSIasU8q6ueWiQfMNj5rE0qV6C4SJDLgwb/1K2WmRqNBHmBvevqq8s2MNhPCfYwIIc LjjbaGojiMqgRvCIAcCikR3vq/E+uduAf4FiXkVsQhRla2THwAGBWtqK8YEXDvu4seprXK3nOT1 SxU4 Archived-At: Cc: draft-ietf-pce-segment-routing@tools.ietf.org, pce@ietf.org Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: adrian@olddog.co.uk List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 14:56:55 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0131_01D067D4.D383EAF0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0132_01D067D4.D383EAF0" ------=_NextPart_001_0132_01D067D4.D383EAF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I just drew the attached to make sure there is clarity. I think, in view of the existing implementations, it would be good to add the function in a backward compatible way. I think this can be done by saying that the maxStack on the Open becomes the default used in all computations for the PCC unless a specific value is supplied on an individual computation request. A From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 25 March 2015 23:23 To: Jeff Tantsura Cc: pce@ietf.org; draft-ietf-pce-segment-routing@tools.ietf.org Subject: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi Jeff I just wanted to clarify the comment that I made at the mic today as we seemed to be talking at cross-purposes. The draft sets a maximum SID depth in the Open message, which effectively creates an implicit constraint on all queries that are sent over the PCEP session, such that returned paths must not have a SID stack depth greater than the MSD. I think this is wrong, and that the MSD should instead be sent as an explicit constraint on each query. Here is my reasoning. In the PCE architecture it is wrong to assume that the PCC and the ingress router are the same device. There are at least two cases where it is not. . In some network management architectures, the PCC is a network management tool. The network management tool may have many ingress routers in its jurisdiction, each with a different MSD, so it is not true to say that the MSD is a constant for the PCC-PCE session. . In inter-domain routing there is PCE-PCE communication between domains. One of the PCEs plays the role of PCC and is acting on behalf of all edge routers in its domain (or perhaps some domain further upstream). Again, the MSD is not constant on the PCE-PCE session. I don't think that we should rule either of these scenarios out of segment routing, even if they are not the first scenarios that everyone is targeting. At some point we will want to do them and we do not want to re-do the work that we are doing today to make them work. Best regards Jon ------=_NextPart_001_0132_01D067D4.D383EAF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I just drew the = attached to make sure there is clarity.

 

I think, in view of = the existing implementations, it would be good to add the function in a = backward compatible way. I think this can be done by saying that the = maxStack on the Open becomes the default used in all computations for = the PCC unless a specific value is supplied on an individual computation = request.

 

A

 

From: Pce = [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan = Hardwick
Sent: 25 March 2015 23:23
To: Jeff = Tantsura
Cc: pce@ietf.org; = draft-ietf-pce-segment-routing@tools.ietf.org
Subject: [Pce] = Comment on = draft-ietf-pce-segment-routing-01

 

Hi = Jeff

 

I just wanted to clarify the comment that I made at = the mic today as we seemed to be talking at = cross-purposes.

 

The draft = sets a maximum SID depth in the Open message, which effectively creates = an implicit constraint on all queries that are sent over the PCEP = session, such that returned paths must not have a SID stack depth = greater than the MSD.  I think this is wrong, and that the MSD = should instead be sent as an explicit constraint on each query.  = Here is my reasoning.

 

In the PCE = architecture it is wrong to assume that the PCC and the ingress router = are the same device.  There are at least two cases where it is = not.

·         = In some network management architectures, = the PCC is a network management tool.  The network management tool = may have many ingress routers in its jurisdiction, each with a different = MSD, so it is not true to say that the MSD is a constant for the PCC-PCE = session.

·         = In inter-domain routing there is PCE-PCE = communication between domains.  One of the PCEs plays the role of = PCC and is acting on behalf of all edge routers in its domain (or = perhaps some domain further upstream).  Again, the MSD is not = constant on the PCE-PCE session.

 

I = don’t think that we should rule either of these scenarios out of = segment routing, even if they are not the first scenarios that everyone = is targeting.  At some point we will want to do them and we do not = want to re-do the work that we are doing today to make them = work.

 

Best regards

Jon

 

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<26984_1427368686_5513EAEE_26984_1142_1_f953b647-329b-4275-9f95-45dc13fc5cdd@OPEXCLILMA1.corporate.adroot.infra.ftgroup> <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3@ENFICSMBX1.datcon.co.uk> <55140D9C.1090602@orange.com> In-Reply-To: <55140D9C.1090602@orange.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.4.4.140807 x-originating-ip: [147.117.188.12] Content-Type: multipart/mixed; boundary="_004_D139687493E56jefftantsuraericssoncom_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrIIsWRmVeSWpSXmKPExsUyuXRPlO6rfcKhBjsWyFus2l1p0dOrbXHz 3FU2i6b7N9gt1l9/yujA6rFkyU8mj6M35zJ7tDw7yebx5fJntgCWKC6blNSczLLUIn27BK6M rhP/WQp+rmCquLHvOksD480Gpi5GTg4JAROJa41tLBC2mMSFe+vZuhi5OIQEjjBK3PlyHqxI SGA5o8Tp83ogNpuAgcT/b8dZQIpEBOYzSvSdmcsK4jALbGGU2PLgECtIlbCAvcSqz+vBukUE HCTefbzECGH7Sax8/A0sziKgKrFwxS2w1bwC5hJHrk5ghFh9iUni7qkj7F2MHBycAloS+z7l gNQwAp33/dQasF5mAXGJW0/mQ70gIvHw4mk2CFtU4uXjf2A3iAroSTzbsJkdIq4kMef1NWaQ kcwCYRINv00g1gpKnJz5hGUCo9gsJFNnIVTNQlIFURIj8W3yUzYI20Di/bn5zBC2tsSyha+h bH2JjV/OMkKMsZZY0sSHTcmqZ2+hbBWJ3pffgcaDAnENo8TF7hYWmPkvdrRD7VKUmNL9kH0B I98qRo7S4tSy3HQjw02MwDRyTILNcQfjgk+WhxgFOBiVeHg/2AqHCrEmlhVX5h5ilOZgURLn LbtyMERIID2xJDU7NbUgtSi+qDQntfgQIxMHp1QD46qplxxvX13Ax/z4Ts/kn30ChSdWRs17 eNuF/8AKceb0pgnTV20Jn740RUV80WnlkloG05I9diYpnFcyghgmpD2ojN6++9Muldo/cxd0 rHNO8Fe2MJKd/1Dt7uHPMjNuFH2IWHm5P/xfZteytR+ycgRKly2Z9t9mK8c0EQmJ+394vkUy OH47UqjEUpyRaKjFXFScCAC6x41KBAMAAA== Archived-At: Cc: "pce@ietf.org" , "draft-ietf-pce-segment-routing@tools.ietf.org" , Sriganesh Kini Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 15:10:09 -0000 --_004_D139687493E56jefftantsuraericssoncom_ Content-Type: multipart/alternative; boundary="_000_D139687493E56jefftantsuraericssoncom_" --_000_D139687493E56jefftantsuraericssoncom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi, Great discussion! Let=92s try no to mix things. 1. Entropy labels (LB for ECMP/LAG) use case has been described in draft= -ietf-mpls-spring-entropy-label, this ID defines new capability - RLD - Rea= dable Label Depth which is used to define how (or multiple of tho= se) should be instantiated. 2. draft-xu-isis-mpls-elc and draft-xu-ospf-mpls-elc define RLSDC -Reada= ble Label Stack Deepth Capability which is used to advertise the capability= of the router to read a label stack of a particular depth. Back to the original discussion =96 Jon is right =96 MSD is significant on = the ingress only since only ingress knows total stack depth and is in charg= e of pushing it. Adrian=92s proposal looks good to me =96 we will discuss it among coauthors= and come back ASAP. Thanks everyone for your valuable comments! P.S. We should really agree on terminology :) Cheers, Jeff From: Olivier Dugeon > Date: Thursday, March 26, 2015 at 6:46 AM To: Jonathan Hardwick >, "rabah.guedrez@orange.com" > Cc: "draft-ietf-pce-segment-routing@tools.ietf.org" >, "pce@ietf.org" >, Jeff Tantsura > Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hello Jon, Yes you agree. From the pure Segment Routing and MPLS point of view. Now, l= ooking to load balancing, it is quiet different. When you setup LAG or Load= Balancing, the router perform a hash on the packet header to determine on = which interface to send the packet. In general, the has allow a router to s= end all packets that belongs to the same session goes to the same interface= / path. Now, some hardware limitation impose a limitation on the size of t= he label stack in order to continue to operate the hash function on the IP = header located after the label stack. In the label stack is too huge, the h= ash function will operate across the beginning of the IP header and the end= of label stack resulting on non optimal session segregation. In some case = it could not be acceptable and lead into problem from an operational point = of view. For example, it could cause some packets de-ordering (packets of t= he same session not follow the same path) that could be not supported by so= me application e.g. VoIP. So, if for example a PE router accept a MSD of 10 labels and a P router acc= ept a MSD of 5 labels, the computed SR path must take into account that whe= n reaching the P router, le Segment packet must not have a label stack grea= ter than 5 (or 6 depending if the hash is perform before or after the POP o= peration). Hope this clarify our requests. Regards Olivier Le 26/03/2015 14:24, Jonathan Hardwick a =E9crit : Olivier, Rabah, Please could you clarify something for me? I=92m not sure that the MSD of = the intermediate nodes has the same significance as the MSD of the ingress = node. My understanding is that the ingress node is often limited by hardwa= re in the maximum depth of the SID stack that it can push onto each packet.= The intermediate nodes do not have to push SIDs =96 I thought that they w= ould just route on the top-most SID in the stack and sometimes remove the t= op-most SID from the stack. If that=92s true then the MSD path constraint = does not apply to them. Have I misunderstood? Best regards Jon From:rabah.guedrez@orange.com [mailto:raba= h.guedrez@orange.com] Sent: 26 March 2015 06:18 To: DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Subject: RE: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi, I totally agree with Olivier and Jonathan on this. to encompass all the varieties of PCE/PCC architectures, the MSD should be = considered as additional constraint by the path computation engine just lik= e the BANDWIDTH, the only scenario I can think of where the MSD must be announced by the PCC= is inter-PCE collaboration and the right place would be for it is PCReq. I Agree with Olivier a support his proposition. considering only the PCC MSD and not the intermediate nodes by the path com= putation engine will result in paths that don=92t behave as expected, (spec= ially for load balancing in a loose path scenario ),the PCE must have in its TED all the MSDs of all= the nodes (PE and P) in its domain, therefore the MSD should advertised by= the IGP (OSPF, ISIS, BGP-LS) just like the SRLGs, where the path computation engine will conside= r the MSDs of the ingress and intermediate to compute the path. Best regards, GUEDREZ Rabah De : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon Envoy=E9 : jeudi 26 mars 2015 09:31 =C0 : Jonathan Hardwick; Jeff Tantsura Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi Jonathan, I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR= capabilities sub-TLV (see e.g. draft-ietf-isis-segment-routing-extensions-= 03.txt page 23 section 3.1). So that, the PCE get the information in its TE= D on a per node basis. Then it is not necessary to add it in the OPEN messa= ge, but eventually, move it on the PCReq/PCInit/PCRept message as a constra= int for the SR path computation. Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ? Regards, Olivier Le 26/03/2015 00:23, Jonathan Hardwick a =E9crit : Hi Jeff I just wanted to clarify the comment that I made at the mic today as we see= med to be talking at cross-purposes. The draft sets a maximum SID depth in the Open message, which effectively c= reates an implicit constraint on all queries that are sent over the PCEP se= ssion, such that returned paths must not have a SID stack depth greater tha= n the MSD. I think this is wrong, and that the MSD should instead be sent = as an explicit constraint on each query. Here is my reasoning. In the PCE architecture it is wrong to assume that the PCC and the ingress = router are the same device. There are at least two cases where it is not. =B7 In some network management architectures, the PCC is a network = management tool. The network management tool may have many ingress routers= in its jurisdiction, each with a different MSD, so it is not true to say t= hat the MSD is a constant for the PCC-PCE session. =B7 In inter-domain routing there is PCE-PCE communication between = domains. One of the PCEs plays the role of PCC and is acting on behalf of = all edge routers in its domain (or perhaps some domain further upstream). = Again, the MSD is not constant on the PCE-PCE session. I don=92t think that we should rule either of these scenarios out of segmen= t routing, even if they are not the first scenarios that everyone is target= ing. At some point we will want to do them and we do not want to re-do the= work that we are doing today to make them work. Best regards Jon _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. -- [logo Orange] Olivier Dugeon Senior research engineer in QoS and network control Open Source Referent Orange/IMT/OLN/WTC/IEE/OPEN fixe : +33 2 96 07 28 80 mobile : +33 6 82 90 37 85 olivier.dugeon@orange.com --_000_D139687493E56jefftantsuraericssoncom_ Content-Type: text/html; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: quoted-printable
Hi,

Great discussion!

Let=92s try no to mix things.
  1. Entropy labels (LB for ECMP/LAG) use case has been described in draft-= ietf-mpls-spring-entropy-label, this ID defines new capability - RLD -= Readable Label Depth which is used to define how <ELI, EL> (or = multiple of those) should be instantiated.
  2. draft-xu-isis-mpls-elc and draft-xu-ospf-mpls-elc define&nbs= p;RLSDC -Readable Label Stack Deepth Capability= which is used to advertise the capability of the= router to read a label stack= of a particular depth.

Back to the original discussion =96 Jon is right =96 MSD is significan= t on the ingress only since only ingress knows total stack depth and is in = charge of pushing it.
Adrian=92s proposal looks good to me =96 we will discuss it among coau= thors and come back ASAP.

Thanks everyone for your valuable comments!

P.S. We should really agree on terminology :)

Cheers,
Jeff

From: Olivier Dugeon <olivier.dugeon@orange.com>
Date: Thursday, March 26, 2015 at 6= :46 AM
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.c= om>, "rabah.guedrez= @orange.com" <rabah= .guedrez@orange.com>
Cc: "draft-ietf-pce-segment-routing@tool= s.ietf.org" <draft-ietf-pce-segment-routing@tools.ietf.org>, "pce@ietf.org" <pce@ietf.org>, Jeff Tantsura <jeff.tantsura@ericsson.com>
Subject: Re: [Pce] Comment on draft= -ietf-pce-segment-routing-01

Hello Jon,

Yes you agree. From the pure Segment Routing and MPLS point of view. Now, l= ooking to load balancing, it is quiet different. When you setup LAG or Load= Balancing, the router perform a hash on the packet header to determine on = which interface to send the packet. In general, the has allow a router to send all packets that belongs to the= same session goes to the same interface / path. Now, some hardware limitat= ion impose a limitation on the size of the label stack in order to continue= to operate the hash function on the IP header located after the label stack. In the label stack is too hug= e, the hash function will operate across the beginning of the IP header and= the end of label stack resulting on non optimal session segregation. In so= me case it could not be acceptable and lead into problem from an operational point of view. For example, it c= ould cause some packets de-ordering (packets of the same session not follow= the same path) that could be not supported by some application e.g. VoIP.

So, if for example a PE router accept a MSD of 10 labels and a P router acc= ept a MSD of 5 labels, the computed SR path must take into account that whe= n reaching the P router, le Segment packet must not have a label stack grea= ter than 5 (or 6 depending if the hash is perform before or after the POP operation).

Hope this clarify our requests.

Regards

Olivier

Le 26/03/2015 14:24, Jonathan Hardwick a =E9= crit :

Olivier, Rabah,

 

Please could you clari= fy something for me?  I=92m not sure that the MSD of the intermediate = nodes has the same significance as the MSD of the ingress node.  My un= derstanding is that the ingress node is often limited by hardware in the maximum depth of the SID stack that it can push onto ea= ch packet.  The intermediate nodes do not have to push SIDs =96 I thou= ght that they would just route on the top-most SID in the stack and sometim= es remove the top-most SID from the stack.  If that=92s true then the MSD path constraint does not apply to them. = ; Have I misunderstood?

 

Best regards

Jon<= /p>

 

 

From:rabah.guedrez@orange.com [mailto:rabah.guedrez@orange.com]
Sent: 26 March 2015 06:18
To: DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura
Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Subject: RE: [Pce] Comment on draft-ietf-pce-segment-routing-01=

 

Hi,

I totally agree with Olivier and Jonathan on th= is.

to encompass all the varieties of PCE/PCC archi= tectures, the MSD should be considered as additional constraint by the path= computation engine just like the BANDWIDTH,

the only scenario I can think of where the MSD = must be announced by the PCC is inter-PCE collaboration and the right place= would be for it is PCReq.

 

 

I Agree with Olivier a support his proposition.=

considering only the PCC MSD and not the interm= ediate nodes by the path computation engine will result in paths that don= =92t behave as expected, (specially for load balancing

in a loose path scenario ),the PCE must have in= its TED all the MSDs of all the nodes (PE and P) in its domain, therefore = the MSD should advertised by the IGP (OSPF, ISIS,

BGP-LS) just like the SRLGs, where the path com= putation engine will consider  the  MSDs of the ingress and inter= mediate to compute the path.

 

 

 

Best regards,

GUEDREZ Rabah

 

De : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon
Envoy=E9 : jeudi 26 mars 2015 09:31
=C0 : Jonathan Hardwick; Jeff Tantsura
Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01<= o:p>

 

Hi Jonathan,

I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR capabilities sub-TLV (see e.g. dr= aft-ietf-isis-segment-routing-extensions-03.txt page 23 section 3.1). So th= at, the PCE get the information in its TED on a per node basis. Then it is = not necessary to add it in the OPEN message, but eventually, move it on the PCReq/PCInit/PCRept message as a c= onstraint for the SR path computation.

Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ?

Regards,

Olivier

Le 26/03/2015 00:23, Jonathan Hard= wick a =E9crit :

Hi Jeff

 

I just wanted to clarify the comme= nt that I made at the mic today as we seemed to be talking at cross-purpose= s.

 

The draft sets a maximum SID depth= in the Open message, which effectively creates an implicit constraint on a= ll queries that are sent over the PCEP session, such that returned paths mu= st not have a SID stack depth greater than the MSD.  I think this is wrong, and that the MSD should instead= be sent as an explicit constraint on each query.  Here is my reasonin= g.

 

In the PCE architecture it is wron= g to assume that the PCC and the ingress router are the same device.  = There are at least two cases where it is not.

=B7         In some network manage= ment architectures, the PCC is a network management tool.  The network= management tool may have many ingress routers in its jurisdiction, each wi= th a different MSD, so it is not true to say that the MSD is a constant for the PCC-PCE session.<= /p>

=B7         In inter-domain routin= g there is PCE-PCE communication between domains.  One of the PCEs pla= ys the role of PCC and is acting on behalf of all edge routers in its domai= n (or perhaps some domain further upstream).  Again, the MSD is not constant on the PCE-PCE session.

 

I don=92t think that we should rul= e either of these scenarios out of segment routing, even if they are not th= e first scenarios that everyone is targeting.  At some point we will w= ant to do them and we do not want to re-do the work that we are doing today to make them work.

 

Best regards

Jon

 



_______________________________________________=

Pce mailing list
Pce@ietf.org
https://www.ietf.org/mailman/listinfo/pce

 

____________________________________________________=
_____________________________________________________________________<=
/o:p>
 
Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.
 
This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;
they should not be distributed, used or copied witho=
ut authorisation.
If you have received this email in error, please not=
ify the sender and delete this message and its attachments.
As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.

Thank you.

--
3D"logo

 

Olivier Dugeon
Senior research engineer in QoS and network control
Open Source Referent
Orange/IMT/OLN/WTC/IEE/OPEN

 

fixe : +33 2 96 07 28 80
mobile : +33 6 82 90 37 85
olivier.dugeon@orange.com

 

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Now, looking to your=20 picture, how the NMS/Controller acting as PCC know the MSD value of blue = / green / yellow routers ? especially if they are all different ? By=20 management plane ? I would not tomanage such database manually on large=20 network ( >1000 PE). Letting PE advertise their MSD in SR Router=20 capabilities will be safer. There is also another problem. Suppose that on a router you have=20 different revision of hardware (common case in operational network where = you mix in the same backplane different cards that support interfaces)=20 with different capabilities, resulting in different MSD.Indeed, in=20 general, label stacking is a hardware operation that take place in=20 interface or master cards where interface are located. How could I manage this ? Regards, Olivier Le 26/03/2015 15:54, Adrian Farrel a =E9crit : > > I just drew the attached to make sure there is clarity. > > I think, in view of the existing implementations, it would be good to=20 > add the function in a backward compatible way. I think this can be=20 > done by saying that the maxStack on the Open becomes the default used=20 > in all computations for the PCC unless a specific value is supplied on = > an individual computation request. > > A > > *From:*Pce [mailto:pce-bounces@ietf.org] *On Behalf Of *Jonathan Hardwi= ck > *Sent:* 25 March 2015 23:23 > *To:* Jeff Tantsura > *Cc:* pce@ietf.org; draft-ietf-pce-segment-routing@tools.ietf.org > *Subject:* [Pce] Comment on draft-ietf-pce-segment-routing-01 > > Hi Jeff > > I just wanted to clarify the comment that I made at the mic today as=20 > we seemed to be talking at cross-purposes. > > The draft sets a maximum SID depth in the Open message, which=20 > effectively creates an implicit constraint on all queries that are=20 > sent over the PCEP session, such that returned paths must not have a=20 > SID stack depth greater than the MSD. I think this is wrong, and that = > the MSD should instead be sent as an explicit constraint on each=20 > query. Here is my reasoning. > > In the PCE architecture it is wrong to assume that the PCC and the=20 > ingress router are the same device. There are at least two cases=20 > where it is not. > > =B7In some network management architectures, the PCC is a network=20 > management tool. The network management tool may have many ingress=20 > routers in its jurisdiction, each with a different MSD, so it is not=20 > true to say that the MSD is a constant for the PCC-PCE session. > > =B7In inter-domain routing there is PCE-PCE communication between=20 > domains. One of the PCEs plays the role of PCC and is acting on=20 > behalf of all edge routers in its domain (or perhaps some domain=20 > further upstream). Again, the MSD is not constant on the PCE-PCE sessi= on. > > I don=92t think that we should rule either of these scenarios out of=20 > segment routing, even if they are not the first scenarios that=20 > everyone is targeting. At some point we will want to do them and we=20 > do not want to re-do the work that we are doing today to make them work= =2E > > Best regards > > Jon > > > > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce --------------020609070301000302020103 Content-Type: text/html; charset="windows-1252" Content-Transfer-Encoding: quoted-printable Hello Adrian,

I understand your point concerning the existing implementation and backward compatibility which motivate your answer. Now, looking to your picture, how the NMS/Controller acting as PCC know the MSD value of blue / green / yellow routers ? especially<= /font> if they are all different ? By management plane ? I would not to manage such database manually on = large network ( > 1000 PE). Letting PE advertise their MSD in SR Router capabilities will be safer.

There is also another problem. Suppose that on a router you have different revision of hardware (common case in operational network where= you mix in the same backplane different cards that support interfaces) with different capabilities,= resulting in different MSD. Indeed, in general, labe= l stacking is a hardware operation that take place in interface or master cards where interface are located.
How could I manage this ?

Regards,

Olivier
Le 26/03/2015 15:54, Adrian Farrel a =E9crit=A0:

I just drew the attached to make sure there is clarity.

=A0

I think, in view of the existing implementations, it would be good to add the function in a backward compatible way. I think this can be done by saying that the maxStack on the Open becomes the default used in all computations for the PCC unless a specific value is supplied on an individual computation request.

=A0

A

=A0

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: 25 March 2015 23:23
To: Jeff Tantsura
Cc: pce@ietf.org; draft-ietf-pce-segment-routi= ng@tools.ietf.org
Subject: [Pce] Comment on draft-ietf-pce-segment-routing-01

=

=A0

Hi Jeff

=A0

I just wanted to clarify the comment tha= t I made at the mic today as we seemed to be talking at cross-purposes.

=A0

The draft sets a maximum SID depth in th= e Open message, which effectively creates an implicit constraint on all queries that are sent over the PCEP session, such that returned paths must not have a SID stack depth greater than the MSD.=A0 I think this is wrong, and tha= t the MSD should instead be sent as an explicit constraint on each query.=A0 Here is my reasoning.

=A0

In the PCE architecture it is wrong to assume that the PCC and the ingress router are the same device.=A0 There are at least two cases where it is not.=

=B7=A0=A0=A0=A0=A0=A0=A0=A0 <= /span>In some network management architectures, the PCC is a network management tool.=A0 The network management tool may have many= ingress routers in its jurisdiction, each with a different MSD, so it is not true to say that the MSD is a constant for the PCC-PCE session.

=B7=A0=A0=A0=A0=A0=A0=A0=A0 <= /span>In inter-domain routing there is PCE-PCE communication between domains.=A0 One of the PCEs plays the role of PCC and is acting on behalf of all edge routers in its domain (or perhaps some domain further upstream).=A0 Again, the MSD is not constant on the PCE-PCE session.

=A0

I don=92t think that we should rule eith= er of these scenarios out of segment routing, even if they are not the first scenarios that everyone is targeting.=A0 At som= e point we will want to do them and we do not want to re-do the work that we are doing today to make them work.

=A0

Best regards

Jon

=A0



_______________________________________________
Pce mailing list
Pce@ie=
tf.org
https://www.ietf.org/mailman/listinfo/pce

--------------020609070301000302020103-- From nobody Thu Mar 26 10:52:19 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B555E1A88EF for ; Thu, 26 Mar 2015 10:52:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.599 X-Spam-Level: X-Spam-Status: No, score=-102.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, USER_IN_WHITELIST=-100] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fe1BVXVMObq8 for ; Thu, 26 Mar 2015 10:52:05 -0700 (PDT) Received: from asmtp3.iomartmail.com (asmtp3.iomartmail.com [62.128.201.159]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 448DE1A8F3F for ; Thu, 26 Mar 2015 10:52:01 -0700 (PDT) Received: from asmtp3.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id t2QHpvct027254; Thu, 26 Mar 2015 17:51:57 GMT Received: from 950129200 (dhcp-b383.meeting.ietf.org [31.133.179.131]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id t2QHpoKF027089 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO); Thu, 26 Mar 2015 17:51:52 GMT From: "Adrian Farrel" To: "'Olivier Dugeon'" , "'Jonathan Hardwick'" , "'Jeff Tantsura'" References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> <013001d067d4$d38179f0$7a846dd0$@olddog.co.uk> <55144138.1050309@orange.com> In-Reply-To: <55144138.1050309@orange.com> Date: Thu, 26 Mar 2015 17:51:49 -0000 Message-ID: <025401d067ed$8bd27500$a3775f00$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0255_01D067ED.8BD88F80" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJVVVae6AhUn2OHluad69wc27KJuQHo+5koAiXAUSGcBLijwA== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1576-7.5.0.1018-21428.000 X-TM-AS-Result: No--16.251-10.0-31-10 X-imss-scan-details: No--16.251-10.0-31-10 X-TMASE-MatchedRID: pS5owHKhBO3VMZ6a6TT71R3EEAbn+GRbQKuv8uQBDjoA9Tpq5qSGJopq cdpMimcywj5g/UXkIdFAYpP+QnD8/kiWF3feMf+ALUfH1TEwaN0XalRvphFgrt+S+dMLEiZsM+p +NpswZmpJ7+mZxZA1Mmn3VzE4plGwl4ekJe9pqCGrfZ+usyeESNMxD/3e8Txdnp5xm7SCK7EFda zC65CWD8b6b2ifHmVRljn03OeOY4ouq2prQc5N6JRrnSy7UTtb0i/hFXziUdN/tE9YIUrwYuoPU WMnzVTmMbxNZR/meU9n9MTmzsnERZehWb8K3L/Nc+QhWKJM04MxmbT6wQT2awZbeEWcL03V0O+n JS4tIxV0t/GrJ/EUsUdtuGVADlqixfJjjM19O0fyNvN+o279BPriLmWBrDIEBX9nCl4coo8o7mF XwNsXZRHu6probU330IVjcyj2fXdxzwb0rKc345BOzK6mj2LNuP9+fQUL2ajSYAzZ6KmqWjaQAc 7spifKEhwoW7baUu/YBbVkA+ea3/9Nl0WAv/Hrqbg9uWhLYLf2kudi1D33ErJ3rmpkUU+TJ8H95 H5rK0M22uoEm245foFaNaPuEIbSaWbbDm4LdIZ3vIzA7XyIiCEF1RdqrHVdtdx2lXHjF1KWFsXo xuXJDPXTJA26jU4lkhRShy60CjQzG8Dg48sJ/vIVL3+KSNgwkTzAgHG5eNKgJH974mpbq6gTkLg TtTggIm6fKcuFyK8oR0K3DJ8mwtZXwwpvfhGVFlT/KggLyj0lWygvtTclwFahGRt1loBuDYXq2a 0NnVVfw77qsJLx4a79IeZeKVGhemgKwHPoCHueAiCmPx4NwGmRqNBHmBvenFK7VE/xL0lFGCd0S 0NCshJ5NRoxUgFdQWxEaKkvsBKjxoBPmBrL5GQRyBapGfZSlExlQIQeRG0= Archived-At: Cc: pce@ietf.org, draft-ietf-pce-segment-routing@tools.ietf.org Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: adrian@olddog.co.uk List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 17:52:15 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0255_01D067ED.8BD88F80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, =20 I just drew a picture to show a case where there is not a one-to-one relationship between PCEP session and PCC. =20 You have two questions: =20 1. How does the PCC know the capabilities of the LSRs it controls and = how does it control them? Answer: don't care :-) =20 2. What if an LSR has different capabilities for different cards? Answer: Easy solution is to use Jeff's picture (PCC is LSR) and my = solution (maxStack is a per PCReq parameter). But note that the choice of card = might depend on the selected first hop in the path, in which case you are = going to need to make maxStack a property of the links in the TED at least for = the ingress LSRs. =20 A =20 From: Olivier Dugeon [mailto:olivier.dugeon@orange.com]=20 Sent: 26 March 2015 17:26 To: adrian@olddog.co.uk; 'Jonathan Hardwick'; 'Jeff Tantsura' Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 =20 Hello Adrian, I understand your point concerning the existing implementation and = backward compatibility which motivate your answer. Now, looking to your picture, = how the NMS/Controller acting as PCC know the MSD value of blue / green / yellow = routers ? especially if they are all different ? By management plane ? I would = not to manage such database manually on large network ( > 1000 PE). Letting PE advertise their MSD in SR Router capabilities will be safer. There is also another problem. Suppose that on a router you have = different revision of hardware (common case in operational network where you mix = in the same backplane different cards that support interfaces) with different capabilities, resulting in different MSD. Indeed, in general, label = stacking is a hardware operation that take place in interface or master cards where interface are located. How could I manage this ? Regards, Olivier Le 26/03/2015 15:54, Adrian Farrel a =E9crit : I just drew the attached to make sure there is clarity. =20 I think, in view of the existing implementations, it would be good to = add the function in a backward compatible way. I think this can be done by = saying that the maxStack on the Open becomes the default used in all computations = for the PCC unless a specific value is supplied on an individual computation = request. =20 A =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 25 March 2015 23:23 To: Jeff Tantsura Cc: pce@ietf.org; draft-ietf-pce-segment-routing@tools.ietf.org Subject: [Pce] Comment on draft-ietf-pce-segment-routing-01 =20 Hi Jeff =20 I just wanted to clarify the comment that I made at the mic today as we = seemed to be talking at cross-purposes. =20 The draft sets a maximum SID depth in the Open message, which = effectively creates an implicit constraint on all queries that are sent over the = PCEP session, such that returned paths must not have a SID stack depth = greater than the MSD. I think this is wrong, and that the MSD should instead be sent = as an explicit constraint on each query. Here is my reasoning. =20 In the PCE architecture it is wrong to assume that the PCC and the = ingress router are the same device. There are at least two cases where it is = not. =B7 In some network management architectures, the PCC is a = network management tool. The network management tool may have many ingress = routers in its jurisdiction, each with a different MSD, so it is not true to say = that the MSD is a constant for the PCC-PCE session. =B7 In inter-domain routing there is PCE-PCE communication = between domains. One of the PCEs plays the role of PCC and is acting on behalf = of all edge routers in its domain (or perhaps some domain further upstream). = Again, the MSD is not constant on the PCE-PCE session. =20 I don=92t think that we should rule either of these scenarios out of = segment routing, even if they are not the first scenarios that everyone is = targeting. At some point we will want to do them and we do not want to re-do the = work that we are doing today to make them work. =20 Best regards Jon =20 _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce =20 ------=_NextPart_000_0255_01D067ED.8BD88F80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,

 

I just drew a picture to show a case where there = is not a one-to-one relationship between PCEP session and = PCC.

 

You have two questions:

 

1. How does the PCC know the capabilities of the = LSRs it controls and how does it control them?

Answer: don't care :-)

 

2. What if an LSR has different capabilities for = different cards?

Answer: Easy solution is to use Jeff's picture = (PCC is LSR) and my solution (maxStack is a per PCReq parameter). But = note that the choice of card might depend on the selected first hop in = the path, in which case you are going to need to make maxStack a = property of the links in the TED at least for the ingress = LSRs.

 

A

 

From: = Olivier Dugeon [mailto:olivier.dugeon@orange.com]
Sent: 26 = March 2015 17:26
To: adrian@olddog.co.uk; 'Jonathan Hardwick'; = 'Jeff Tantsura'
Cc: = draft-ietf-pce-segment-routing@tools.ietf.org; = pce@ietf.org
Subject: Re: [Pce] Comment on = draft-ietf-pce-segment-routing-01

 

Hello Adrian,

I understand your point concerning the = existing implementation and backward compatibility which motivate your = answer. Now, looking to your picture, how the NMS/Controller acting as = PCC know the MSD value of blue / green / yellow routers ? especially if = they are all different ? By management plane ? I would not to manage = such database manually on large network ( > 1000 PE). Letting PE = advertise their MSD in SR Router capabilities will be = safer.

There is also another problem. Suppose that on a router = you have different revision of hardware (common case in operational = network where you mix in the same backplane different cards that support = interfaces) with different capabilities, resulting in different MSD. = Indeed, in general, label stacking is a hardware operation that take = place in interface or master cards where interface are located.
How = could I manage this ?

Regards,

Olivier

Le 26/03/2015 15:54, = Adrian Farrel a =E9crit :

I just drew the attached to make sure there is = clarity.

 

I think, in view of the existing implementations, it = would be good to add the function in a backward compatible way. I think = this can be done by saying that the maxStack on the Open becomes the = default used in all computations for the PCC unless a specific value is = supplied on an individual computation request.

 

A

 

From: Pce [mailto:pce-bounces@ietf.org] = On Behalf Of Jonathan Hardwick
Sent: 25 March 2015 = 23:23
To: Jeff Tantsura
Cc: pce@ietf.org; draft-ietf-= pce-segment-routing@tools.ietf.org
Subject: [Pce] Comment = on draft-ietf-pce-segment-routing-01

 

Hi = Jeff

 

I just wanted to clarify the comment that I made at = the mic today as we seemed to be talking at = cross-purposes.

 

The draft = sets a maximum SID depth in the Open message, which effectively creates = an implicit constraint on all queries that are sent over the PCEP = session, such that returned paths must not have a SID stack depth = greater than the MSD.  I think this is wrong, and that the MSD = should instead be sent as an explicit constraint on each query.  = Here is my reasoning.

 

In the PCE = architecture it is wrong to assume that the PCC and the ingress router = are the same device.  There are at least two cases where it is = not.

=B7         = In some network management architectures, = the PCC is a network management tool.  The network management tool = may have many ingress routers in its jurisdiction, each with a different = MSD, so it is not true to say that the MSD is a constant for the PCC-PCE = session.

=B7         = In inter-domain routing there is PCE-PCE = communication between domains.  One of the PCEs plays the role of = PCC and is acting on behalf of all edge routers in its domain (or = perhaps some domain further upstream).  Again, the MSD is not = constant on the PCE-PCE session.

 

I = don’t think that we should rule either of these scenarios out of = segment routing, even if they are not the first scenarios that everyone = is targeting.  At some point we will want to do them and we do not = want to re-do the work that we are doing today to make them = work.

 

Best regards

Jon

 




_______________________________________________
Pce mailing list
Pce@ietf.org
https://www.ietf.org/m=
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------=_NextPart_000_0255_01D067ED.8BD88F80-- From nobody Thu Mar 26 13:58:06 2015 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 232371B2E33 for ; Thu, 26 Mar 2015 13:52:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6DMTn66I5thP for ; Thu, 26 Mar 2015 13:52:16 -0700 (PDT) Received: from usevmg20.ericsson.net (usevmg20.ericsson.net [198.24.6.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 435C81B2B62 for ; Thu, 26 Mar 2015 13:52:16 -0700 (PDT) X-AuditID: c618062d-f79686d0000030a8-4a-55141ba639c6 Received: from EUSAAHC007.ericsson.se (Unknown_Domain [147.117.188.93]) by usevmg20.ericsson.net (Symantec Mail Security) with SMTP id A9.8F.12456.6AB14155; Thu, 26 Mar 2015 15:45:58 +0100 (CET) Received: from EUSAAMB101.ericsson.se ([147.117.188.118]) by EUSAAHC007.ericsson.se ([147.117.188.93]) with mapi id 14.03.0210.002; Thu, 26 Mar 2015 16:52:14 -0400 From: Sriganesh Kini To: Jeff Tantsura , Olivier Dugeon , Jonathan Hardwick , "rabah.guedrez@orange.com" Thread-Topic: [Pce] Comment on draft-ietf-pce-segment-routing-01 Thread-Index: AdBnUqmGmqdQpQQXQvqi/1kiPeBWRQAbgHUAAAXYOoAABGvkgAAAv8cA//+hnACAAGAaAA== Date: Thu, 26 Mar 2015 20:52:13 +0000 Message-ID: References: <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971AB0F@ENFICSMBX1.datcon.co.uk> <5513C3B0.2060600@orange.com> <26984_1427368686_5513EAEE_26984_1142_1_f953b647-329b-4275-9f95-45dc13fc5cdd@OPEXCLILMA1.corporate.adroot.infra.ftgroup> <09CE6C3BE5E1EA40B987BF5F25D8DDBA012971ADB3@ENFICSMBX1.datcon.co.uk> <55140D9C.1090602@orange.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.4.5.141003 x-originating-ip: [147.117.188.11] Content-Type: multipart/mixed; boundary="_004_D13981623C88Bsriganeshkiniericssoncom_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrMIsWRmVeSWpSXmKPExsUyuXRPrO4yaZFQg5/LJC1W7a606OnVtrh5 7iqbRdP9G+wW668/ZXRg9Viy5CeTx9Gbc5k9Wp6dZPP4cvkzWwBLFJdNSmpOZllqkb5dAlfG 861vGAvenWCq6Dp2lrGBceFcpi5GTg4JAROJo5fXskLYYhIX7q1nA7GFBI4wSmz4XQphL2eU eHmYHcRmEzCSuHB3PksXIxeHiMBZRoltPQeZQRxmgTZGieYD88G6hQXsJVZ9Xg+2QUTAQeLd x0uMEHaYxMcD28FqWARUJV7O/AM2lVfAQuLmirdsIIOEBP4xSRw90cgMkuAESlze+RWsiBHo vO+n1oANZRYQl7j1ZD7UCyISDy+eZoOwRSVePv4H9o6ogJ7EvIevoOJKEh9/z2eH6A2XmLT6 ONRiQYmTM5+wTGAUm4Vk7CwkZbOQlEHEYyXubJ3NDmEbSLw/N58ZwtaWWLbwNZStL7Hxy1nG WYwcQLa1xLylLtiUrHr2FspWkeh9+R1oPCgc1zBK3Hm9mRVm/osd7WwQtqLElO6H7AsY+VYx cpQWp5blphsZbGIEppJjEmy6Oxj3vLQ8xCjAwajEw/vBVjhUiDWxrLgy9xCjNAeLkjjvogcH Q4QE0hNLUrNTUwtSi+KLSnNSiw8xMnFwSjUw2jRJG3pOOD77sUGIoWTMbtYp+dblIswNrW51 b42ePHz9SuqHrsTBtkdR0ww+SrLL8/yJ8Kj8/bbt0Mv/XzjXthzNDlUV3L1y7+7QoA3Kok6O U0wNFl3hr4lMvKmapGz7+M/H0pcrpArDGaZHTpi2fLa/EDfjwq8yc+/1SazeXinR+/Cg3GlW JZbijERDLeai4kQASms+pAYDAAA= Archived-At: X-Mailman-Approved-At: Thu, 26 Mar 2015 13:58:05 -0700 Cc: "pce@ietf.org" , "draft-ietf-pce-segment-routing@tools.ietf.org" Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 20:52:21 -0000 --_004_D13981623C88Bsriganeshkiniericssoncom_ Content-Type: multipart/alternative; boundary="_000_D13981623C88Bsriganeshkiniericssoncom_" --_000_D13981623C88Bsriganeshkiniericssoncom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi, The PCE should take into account both the RLD and MSD when computing the la= bel stack. Draft-ietf-mpls-spring-entropy-label has some examples. Completely agree on aligning terminology. draft-ietf-mpls-spring-entropy-la= bel and draft-xu-ospf-mpls-elc also need to reconcile the acronyms RLD and = RLSD. I also have a suggestion for draft-ietf-pce-segment-routing =96 Since= it is trying to express the maximum number of stack elements that can be p= ushed at the ingress, the appropriate acronym seems to be MSP (Maximum Sta= ck PUSH-operations) capability. Sri From: Jeff Tantsura > Date: Thursday, March 26, 2015 at 8:08 AM To: Olivier Dugeon >, Jonathan Hardwick >, "rabah.guedrez@orange.com" > Cc: "draft-ietf-pce-segment-routing@tools.ietf.org" >, "pce@ietf.org" >, Sriganesh Kini > Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi, Great discussion! Let=92s try no to mix things. 1. Entropy labels (LB for ECMP/LAG) use case has been described in draft= -ietf-mpls-spring-entropy-label, this ID defines new capability - RLD - Rea= dable Label Depth which is used to define how (or multiple of tho= se) should be instantiated. 2. draft-xu-isis-mpls-elc and draft-xu-ospf-mpls-elc define RLSDC -Reada= ble Label Stack Deepth Capability which is used to advertise the capability= of the router to read a label stack of a particular depth. Back to the original discussion =96 Jon is right =96 MSD is significant on = the ingress only since only ingress knows total stack depth and is in charg= e of pushing it. Adrian=92s proposal looks good to me =96 we will discuss it among coauthors= and come back ASAP. Thanks everyone for your valuable comments! P.S. We should really agree on terminology :) Cheers, Jeff From: Olivier Dugeon > Date: Thursday, March 26, 2015 at 6:46 AM To: Jonathan Hardwick >, "rabah.guedrez@orange.com" > Cc: "draft-ietf-pce-segment-routing@tools.ietf.org" >, "pce@ietf.org" >, Jeff Tantsura > Subject: Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hello Jon, Yes you agree. From the pure Segment Routing and MPLS point of view. Now, l= ooking to load balancing, it is quiet different. When you setup LAG or Load= Balancing, the router perform a hash on the packet header to determine on = which interface to send the packet. In general, the has allow a router to s= end all packets that belongs to the same session goes to the same interface= / path. Now, some hardware limitation impose a limitation on the size of t= he label stack in order to continue to operate the hash function on the IP = header located after the label stack. In the label stack is too huge, the h= ash function will operate across the beginning of the IP header and the end= of label stack resulting on non optimal session segregation. In some case = it could not be acceptable and lead into problem from an operational point = of view. For example, it could cause some packets de-ordering (packets of t= he same session not follow the same path) that could be not supported by so= me application e.g. VoIP. So, if for example a PE router accept a MSD of 10 labels and a P router acc= ept a MSD of 5 labels, the computed SR path must take into account that whe= n reaching the P router, le Segment packet must not have a label stack grea= ter than 5 (or 6 depending if the hash is perform before or after the POP o= peration). Hope this clarify our requests. Regards Olivier Le 26/03/2015 14:24, Jonathan Hardwick a =E9crit : Olivier, Rabah, Please could you clarify something for me? I=92m not sure that the MSD of = the intermediate nodes has the same significance as the MSD of the ingress = node. My understanding is that the ingress node is often limited by hardwa= re in the maximum depth of the SID stack that it can push onto each packet.= The intermediate nodes do not have to push SIDs =96 I thought that they w= ould just route on the top-most SID in the stack and sometimes remove the t= op-most SID from the stack. If that=92s true then the MSD path constraint = does not apply to them. Have I misunderstood? Best regards Jon From:rabah.guedrez@orange.com [mailto:raba= h.guedrez@orange.com] Sent: 26 March 2015 06:18 To: DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Subject: RE: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi, I totally agree with Olivier and Jonathan on this. to encompass all the varieties of PCE/PCC architectures, the MSD should be = considered as additional constraint by the path computation engine just lik= e the BANDWIDTH, the only scenario I can think of where the MSD must be announced by the PCC= is inter-PCE collaboration and the right place would be for it is PCReq. I Agree with Olivier a support his proposition. considering only the PCC MSD and not the intermediate nodes by the path com= putation engine will result in paths that don=92t behave as expected, (spec= ially for load balancing in a loose path scenario ),the PCE must have in its TED all the MSDs of all= the nodes (PE and P) in its domain, therefore the MSD should advertised by= the IGP (OSPF, ISIS, BGP-LS) just like the SRLGs, where the path computation engine will conside= r the MSDs of the ingress and intermediate to compute the path. Best regards, GUEDREZ Rabah De : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon Envoy=E9 : jeudi 26 mars 2015 09:31 =C0 : Jonathan Hardwick; Jeff Tantsura Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01 Hi Jonathan, I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR= capabilities sub-TLV (see e.g. draft-ietf-isis-segment-routing-extensions-= 03.txt page 23 section 3.1). So that, the PCE get the information in its TE= D on a per node basis. Then it is not necessary to add it in the OPEN messa= ge, but eventually, move it on the PCReq/PCInit/PCRept message as a constra= int for the SR path computation. Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ? Regards, Olivier Le 26/03/2015 00:23, Jonathan Hardwick a =E9crit : Hi Jeff I just wanted to clarify the comment that I made at the mic today as we see= med to be talking at cross-purposes. The draft sets a maximum SID depth in the Open message, which effectively c= reates an implicit constraint on all queries that are sent over the PCEP se= ssion, such that returned paths must not have a SID stack depth greater tha= n the MSD. I think this is wrong, and that the MSD should instead be sent = as an explicit constraint on each query. Here is my reasoning. In the PCE architecture it is wrong to assume that the PCC and the ingress = router are the same device. There are at least two cases where it is not. =B7 In some network management architectures, the PCC is a network = management tool. The network management tool may have many ingress routers= in its jurisdiction, each with a different MSD, so it is not true to say t= hat the MSD is a constant for the PCC-PCE session. =B7 In inter-domain routing there is PCE-PCE communication between = domains. One of the PCEs plays the role of PCC and is acting on behalf of = all edge routers in its domain (or perhaps some domain further upstream). = Again, the MSD is not constant on the PCE-PCE session. I don=92t think that we should rule either of these scenarios out of segmen= t routing, even if they are not the first scenarios that everyone is target= ing. At some point we will want to do them and we do not want to re-do the= work that we are doing today to make them work. Best regards Jon _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. -- [logo Orange] Olivier Dugeon Senior research engineer in QoS and network control Open Source Referent Orange/IMT/OLN/WTC/IEE/OPEN fixe : +33 2 96 07 28 80 mobile : +33 6 82 90 37 85 olivier.dugeon@orange.com --_000_D13981623C88Bsriganeshkiniericssoncom_ Content-Type: text/html; charset="Windows-1252" Content-ID: <72ECD3696F26E84DB7411B5B8700C451@ericsson.com> Content-Transfer-Encoding: quoted-printable
Hi,

The PCE should take into account both the RLD and MSD when computing t= he label stack. Draft-ietf-mpls-spring-entropy-label has some examples.

Completely agree on aligning terminology. draft-ietf-mpls-spring-entro= py-label and draft-xu-ospf-mpls-elc also need to reconcile the acronyms RLD= and RLSD. I also have a suggestion for draft-ietf-pce-segment-routing =96 = Since it is trying to express the maximum number of stack elements that can be pushed at  the ingress, = the appropriate acronym seems to be MSP (Maximum Stack PUSH-operations) cap= ability.

Sri

From: Jeff Tantsura <jeff.tantsura@ericsson.com>
Date: Thursday, March 26, 2015 at 8= :08 AM
To: Olivier Dugeon <olivier.dugeon@orange.com>, Jonatha= n Hardwick <Jonathan= .Hardwick@metaswitch.com>, "rabah.guedrez@orange.com" <rabah.guedrez@orange.com>
Cc: "draft-ietf-pce-segment-routing@tool= s.ietf.org" <draft-ietf-pce-segment-routing@tools.ietf.org>, "pce@ietf.org" <pce@ietf.org>, Sriganesh Kini <sriganesh.kini@ericsson.com>=
Subject: Re: [Pce] Comment on draft= -ietf-pce-segment-routing-01

Hi,

Great discussion!

Let=92s try no to mix things.
  1. Entropy labels (LB for ECMP/LAG) use case has been described in draft-= ietf-mpls-spring-entropy-label, this ID defines new capability - RLD -= Readable Label Depth which is used to define how <ELI, EL> (or = multiple of those) should be instantiated.
  2. draft-xu-isis-mpls-elc and draft-xu-ospf-mpls-elc define&nbs= p;RLSDC -Readable Label Stack Deepth Capability= which is used to advertise the capability of the= router to read a label stack= of a particular depth.

Back to the original discussion =96 Jon is right =96 MSD is significan= t on the ingress only since only ingress knows total stack depth and is in = charge of pushing it.
Adrian=92s proposal looks good to me =96 we will discuss it among coau= thors and come back ASAP.

Thanks everyone for your valuable comments!

P.S. We should really agree on terminology :)

Cheers,
Jeff

From: Olivier Dugeon <olivier.dugeon@orange.com>
Date: Thursday, March 26, 2015 at 6= :46 AM
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.c= om>, "rabah.guedrez= @orange.com" <rabah= .guedrez@orange.com>
Cc: "draft-ietf-pce-segment-routing@tool= s.ietf.org" <draft-ietf-pce-segment-routing@tools.ietf.org>, "pce@ietf.org" <pce@ietf.org>, Jeff Tantsura <jeff.tantsura@ericsson.com>
Subject: Re: [Pce] Comment on draft= -ietf-pce-segment-routing-01

Hello Jon,

Yes you agree. From the pure Segment Routing and MPLS point of view. Now, l= ooking to load balancing, it is quiet different. When you setup LAG or Load= Balancing, the router perform a hash on the packet header to determine on = which interface to send the packet. In general, the has allow a router to send all packets that belongs to the= same session goes to the same interface / path. Now, some hardware limitat= ion impose a limitation on the size of the label stack in order to continue= to operate the hash function on the IP header located after the label stack. In the label stack is too hug= e, the hash function will operate across the beginning of the IP header and= the end of label stack resulting on non optimal session segregation. In so= me case it could not be acceptable and lead into problem from an operational point of view. For example, it c= ould cause some packets de-ordering (packets of the same session not follow= the same path) that could be not supported by some application e.g. VoIP.

So, if for example a PE router accept a MSD of 10 labels and a P router acc= ept a MSD of 5 labels, the computed SR path must take into account that whe= n reaching the P router, le Segment packet must not have a label stack grea= ter than 5 (or 6 depending if the hash is perform before or after the POP operation).

Hope this clarify our requests.

Regards

Olivier

Le 26/03/2015 14:24, Jonathan Hardwick a =E9= crit :

Olivier, Rabah,

 

Please could you clari= fy something for me?  I=92m not sure that the MSD of the intermediate = nodes has the same significance as the MSD of the ingress node.  My un= derstanding is that the ingress node is often limited by hardware in the maximum depth of the SID stack that it can push onto ea= ch packet.  The intermediate nodes do not have to push SIDs =96 I thou= ght that they would just route on the top-most SID in the stack and sometim= es remove the top-most SID from the stack.  If that=92s true then the MSD path constraint does not apply to them. = ; Have I misunderstood?

 

Best regards

Jon<= /p>

 

 

From:rabah.guedrez@orange.com [mailto:rabah.guedrez@orange.com]
Sent: 26 March 2015 06:18
To: DUGEON Olivier IMT/OLN; Jonathan Hardwick; Jeff Tantsura
Cc: draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Subject: RE: [Pce] Comment on draft-ietf-pce-segment-routing-01=

 

Hi,

I totally agree with Olivier and Jonathan on th= is.

to encompass all the varieties of PCE/PCC archi= tectures, the MSD should be considered as additional constraint by the path= computation engine just like the BANDWIDTH,

the only scenario I can think of where the MSD = must be announced by the PCC is inter-PCE collaboration and the right place= would be for it is PCReq.

 

 

I Agree with Olivier a support his proposition.=

considering only the PCC MSD and not the interm= ediate nodes by the path computation engine will result in paths that don= =92t behave as expected, (specially for load balancing

in a loose path scenario ),the PCE must have in= its TED all the MSDs of all the nodes (PE and P) in its domain, therefore = the MSD should advertised by the IGP (OSPF, ISIS,

BGP-LS) just like the SRLGs, where the path com= putation engine will consider  the  MSDs of the ingress and inter= mediate to compute the path.

 

 

 

Best regards,

GUEDREZ Rabah

 

De : Pce [mailto:pce-bounces@ietf.org] De la part de Olivier Dugeon
Envoy=E9 : jeudi 26 mars 2015 09:31
=C0 : Jonathan Hardwick; Jeff Tantsura
Cc : draft-ietf-pce-segment-routing@tools.ietf.org; pce@ietf.org
Objet : Re: [Pce] Comment on draft-ietf-pce-segment-routing-01<= o:p>

 

Hi Jonathan,

I agree with you. The MSD is purely a local information attached to the rou= ter. To correctly manage this information for Segment Path computation, the= PCE must be aware of MSD of each router, not only the PE, but also the P r= outers. So, the best way is to add MSD metric announcement in the router SR capabilities sub-TLV (see e.g. dr= aft-ietf-isis-segment-routing-extensions-03.txt page 23 section 3.1). So th= at, the PCE get the information in its TED on a per node basis. Then it is = not necessary to add it in the OPEN message, but eventually, move it on the PCReq/PCInit/PCRept message as a c= onstraint for the SR path computation.

Now, the main problem, is who can be in charge to propose this new MSD metr= ic ? PCE WG, SPRING WG or IS-IS/OSPF WG ?

Regards,

Olivier

Le 26/03/2015 00:23, Jonathan Hard= wick a =E9crit :

Hi Jeff

 

I just wanted to clarify the comme= nt that I made at the mic today as we seemed to be talking at cross-purpose= s.

 

The draft sets a maximum SID depth= in the Open message, which effectively creates an implicit constraint on a= ll queries that are sent over the PCEP session, such that returned paths mu= st not have a SID stack depth greater than the MSD.  I think this is wrong, and that the MSD should instead= be sent as an explicit constraint on each query.  Here is my reasonin= g.

 

In the PCE architecture it is wron= g to assume that the PCC and the ingress router are the same device.  = There are at least two cases where it is not.

=B7         In some network manage= ment architectures, the PCC is a network management tool.  The network= management tool may have many ingress routers in its jurisdiction, each wi= th a different MSD, so it is not true to say that the MSD is a constant for the PCC-PCE session.<= /p>

=B7         In inter-domain routin= g there is PCE-PCE communication between domains.  One of the PCEs pla= ys the role of PCC and is acting on behalf of all edge routers in its domai= n (or perhaps some domain further upstream).  Again, the MSD is not constant on the PCE-PCE session.

 

I don=92t think that we should rul= e either of these scenarios out of segment routing, even if they are not th= e first scenarios that everyone is targeting.  At some point we will w= ant to do them and we do not want to re-do the work that we are doing today to make them work.

 

Best regards

Jon

 



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s informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisa=
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ointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.
 
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ntial or privileged information that may be protected by law;
they should not be distributed, used or copied witho=
ut authorisation.
If you have received this email in error, please not=
ify the sender and delete this message and its attachments.
As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.

Thank you.

--
3D"logo

 

Olivier Dugeon
Senior research engineer in QoS and network control
Open Source Referent
Orange/IMT/OLN/WTC/IEE/OPEN

 

fixe : +33 2 96 07 28 80
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