From nobody Sun Jul 2 05:15:44 2017 Return-Path: X-Original-To: pce@ietf.org Delivered-To: pce@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id D3026129C0B; Sun, 2 Jul 2017 05:15:36 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Ben Niven-Jenkins To: Cc: draft-ietf-pce-rfc6006bis.all@ietf.org, pce@ietf.org, rtg-ads@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.55.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149899773681.17431.10285629192748593381@ietfa.amsl.com> Date: Sun, 02 Jul 2017 05:15:36 -0700 Archived-At: Subject: [Pce] Rtgdir last call review of draft-ietf-pce-rfc6006bis-02 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 02 Jul 2017 12:15:37 -0000 Reviewer: Ben Niven-Jenkins Review result: Has Issues Hello, I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft. Document: draft-ietf-pce-rfc6006bis-02 Reviewer: Ben Niven-Jenkins Review Date: 2nd July 2017 Intended Status: Standards Track Summary: I have some minor concerns about this document that I think should be resolved before publication. Comments: The document was generally well written and readable. Major Issues: No major issues found. Minor Issues: 1) Section 3.2 SERO & SRRO objects - In Section 6.5 you have them listed with Object-Type 0: Reserved, whereas in section 3.2 you start at 1. you should be consistent and list them the same in section 3.2 as you do in 6.5? Also in Section 6.5 the reference is to [This I-D] whereas in section 3.2 it is to [RFC6006]. 2) Section 3.10 says “When adding new leaves to or removing old leaves from the existing P2MP tree, by supplying a list of existing leaves, it SHOULD be possible to optimise the existing P2MP tree.” I don’t see why you have used a capitalised SHOULD here as you are simply making a statement rather than placing a requirement on an implementation. 3) Section 5 says “PCEP implementations SHOULD consider the additional security provided by Transport Layer Security (TLS) [I-D.ietf-pce-pceps].” Use of SHOULD says to me you expect the majority of implementations to implement I-D.ietf-pce-pceps. So should the reference to I-D.ietf-pce-pceps be normative? 4) Section 6.5 - PCEP Objects. Should you specify the meaning of Object-Types 0, 1 & 2 for the END-POINTS object, like you do for the other objects in this section? Nits: Section 3.9 says “The only difference is that the user MUST insert the list of RROs and SRROs after each type of END-POINTS in the PCReq message” and Section 3.10 also says “To add new leaves, the user MUST build a P2MP request using END-POINTS with leaf type 1.” “To remove old leaves, the user must build a P2MP request using END-POINTS with leaf type 2. “For old leaves, the user MUST provide the old path as a list of RROs that immediately follows each END-POINTS object.” You haven’t used or defined the term “user” up until now. By user do you really mean PCC? If not I think you should explain what/who this user is. From nobody Sun Jul 2 09:08:56 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BEC67129AA8; Sun, 2 Jul 2017 09:08:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.598 X-Spam-Level: X-Spam-Status: No, score=-0.598 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_COMMENT_SAVED_URL=1.391, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_HTML_ATTACH=0.01] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2KVayjX1Kr60; Sun, 2 Jul 2017 09:08:48 -0700 (PDT) Received: from mail-pg0-x234.google.com (mail-pg0-x234.google.com [IPv6:2607:f8b0:400e:c05::234]) (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 8A714127286; Sun, 2 Jul 2017 09:08:45 -0700 (PDT) Received: by mail-pg0-x234.google.com with SMTP id u62so83853551pgb.3; Sun, 02 Jul 2017 09:08:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:subject:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language; bh=jrtegIPJE+UXXE9jEmjtFHtt4pTPEDsV08nuaHqWjJs=; b=XOM464KJEW2g13mpky6IzZlioJCuLyB6nC/ifyn0IaJFM0Jd1Wu86JLh2hLo+DNqHE UDlgPAAVok1zHNtt0eZNFtxaZTaIBT+JZXstl7AAWmGZox/efzsEHVBVPM5lJ17TWc6+ zEPOzsvKdfduZo51H1otMvFaYJbCfsFcQjWr63rAOi/j91aKxXLUY81ikH2A4kPnBD83 Y0Zvt5cfXnRGlmtFMv5w2Hxs6/ZNDDqlJp2R4+2rBX1S1gM2o58pEP0GF9FU559zVZnZ 2k3IrHnFQf45ZEshBbMkdxVO/DWyuXGfYjYdhLf/KYzTY36svs0+7MZNCjegg4Pmb3AB 3Jcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=jrtegIPJE+UXXE9jEmjtFHtt4pTPEDsV08nuaHqWjJs=; b=qijRnHK152hs4hqpVKl/rPh15iKDZsmCDB+n8AH8Q0QU7KTFWhqZ0+RPVx7ntYLjFc UCVdu96HCcaz325007of0eybVWmwlkH2NNCyHPDeakdekivrxRb8vkpQfWDWFdSrVNRs JCLSVWloGPuddZNa5aSKwQcilrVZ4M9RIeMa2AqoGHZ98sEQlAB9a3V3UuPjeGALmEWj s74lprdj7u/aeGjfTlraGDOxs4f72EhyZLn5P7TP3s9yqorPAwgxC57OiFztbfXQl1sx 05+VPFzG6Zd6r+j23XbMjIJM0XlBgmW9YFPxJv2gVh2dJSsYSvNEOfnBPNrwHNRLNOK1 ADkg== X-Gm-Message-State: AIVw1102cwrP8F9mz42hSMu8A23WOs8b50WIsJaepA9XuwphAK8xHDk5 Yyd5jEB6K6atYFxsiZg= X-Received: by 10.84.194.131 with SMTP id h3mr5851243pld.82.1499011725022; Sun, 02 Jul 2017 09:08:45 -0700 (PDT) Received: from [192.168.0.107] ([122.171.123.190]) by smtp.gmail.com with ESMTPSA id f85sm26448517pfj.6.2017.07.02.09.08.40 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 02 Jul 2017 09:08:44 -0700 (PDT) From: Dhruv Dhody To: Ben Niven-Jenkins , rtg-dir@ietf.org Cc: draft-ietf-pce-rfc6006bis.all@ietf.org, pce@ietf.org, rtg-ads@ietf.org, "dhruv.dhody@huawei.com" References: <149899773681.17431.10285629192748593381@ietfa.amsl.com> Message-ID: Date: Sun, 2 Jul 2017 21:38:39 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: <149899773681.17431.10285629192748593381@ietfa.amsl.com> Content-Type: multipart/mixed; boundary="------------4C64B9632F75A51EC27E732A" Content-Language: en-US Archived-At: Subject: Re: [Pce] Rtgdir last call review of draft-ietf-pce-rfc6006bis-02 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 02 Jul 2017 16:08:55 -0000 This is a multi-part message in MIME format. --------------4C64B9632F75A51EC27E732A Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hi Ben, Thanks for your review. Please see inline. On Sunday 02 July 2017 05:45 PM, Ben Niven-Jenkins wrote: > Reviewer: Ben Niven-Jenkins > Review result: Has Issues > > Hello, > > I have been selected as the Routing Directorate reviewer for this draft. The > Routing Directorate seeks to review all routing or routing-related drafts as > they pass through IETF last call and IESG review, and sometimes on special > request. The purpose of the review is to provide assistance to the Routing ADs. > For more information about the Routing Directorate, please see > ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir > > Although these comments are primarily for the use of the Routing ADs, it would > be helpful if you could consider them along with any other IETF Last Call > comments that you receive, and strive to resolve them through discussion or by > updating the draft. > > Document: draft-ietf-pce-rfc6006bis-02 > Reviewer: Ben Niven-Jenkins > Review Date: 2nd July 2017 > Intended Status: Standards Track > > Summary: I have some minor concerns about this document that I think should be > resolved before publication. > > Comments: The document was generally well written and readable. > > Major Issues: No major issues found. > > Minor Issues: > 1) Section 3.2 SERO & SRRO objects - In Section 6.5 you have them listed with > Object-Type 0: Reserved, whereas in section 3.2 you start at 1. you should be > consistent and list them the same in section 3.2 as you do in 6.5? > > Also in Section 6.5 the reference is to [This I-D] whereas in section 3.2 it is > to [RFC6006]. [Dhruv]: Updated. > 2) Section 3.10 says “When adding new leaves to or removing old leaves from the > existing P2MP tree, by supplying a list of existing leaves, it SHOULD be > possible to optimise the existing P2MP tree.” I don’t see why you have used a > capitalised SHOULD here as you are simply making a statement rather than > placing a requirement on an implementation. [Dhruv]: Ok. Updated. > 3) Section 5 says “PCEP implementations SHOULD consider the additional security > provided by Transport Layer Security (TLS) [I-D.ietf-pce-pceps].” > > Use of SHOULD says to me you expect the majority of implementations to > implement I-D.ietf-pce-pceps. So should the reference to I-D.ietf-pce-pceps be > normative? [Dhruv]:Hmm, you may be right. It just that other documents have put this down as Informative usually. PCEPS is also in publication process, so normative reference will most likely not block progress. I am not sure if we should deviate in this document. Thoughts? > 4) Section 6.5 - PCEP Objects. Should you specify the meaning of Object-Types > 0, 1 & 2 for the END-POINTS object, like you do for the other objects in this > section? [Dhruv]: END-POINTS is an existing object defined in RFC5440. This document defines new object-types for the END-POINTS object. Thus I don't think there is a reason to mention 0,1 & 2. > Nits: > Section 3.9 says > “The only difference is that the user MUST insert the list of RROs and SRROs > after each type of END-POINTS in the PCReq message” > > and Section 3.10 also says > > “To add new leaves, the user MUST build a P2MP request using END-POINTS with > leaf type 1.” > > “To remove old leaves, the user must build a P2MP request using END-POINTS with > leaf type 2. > > “For old leaves, the user MUST provide the old path as a list of RROs that > immediately follows each END-POINTS object.” > > You haven’t used or defined the term “user” up until now. By user do you really > mean PCC? If not I think you should explain what/who this user is. [Dhruv]: Updated to PCC. The working copy and diff are attached. Thanks for your review. 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X-Spam-Score: -4.699 X-Spam-Level: X-Spam-Status: No, score=-4.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-2.8] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uhO46zhEFAkw; Sun, 2 Jul 2017 10:20:28 -0700 (PDT) Received: from mailex.mailcore.me (mailex.mailcore.me [94.136.40.146]) by ietfa.amsl.com (Postfix) with ESMTP id C7FE0129A97; Sun, 2 Jul 2017 10:20:27 -0700 (PDT) Received: from [176.24.45.127] (helo=[192.168.0.6]) by smtp04.mailcore.me with esmtpa (Exim 4.89) (envelope-from ) id 1dRiXp-0009QF-NU; Sun, 02 Jul 2017 18:20:26 +0100 Content-Type: multipart/alternative; boundary="Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39" Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\)) From: Ben Niven-Jenkins In-Reply-To: Date: Sun, 2 Jul 2017 18:20:23 +0100 Cc: rtg-dir@ietf.org, draft-ietf-pce-rfc6006bis.all@ietf.org, pce@ietf.org, rtg-ads@ietf.org, "dhruv.dhody@huawei.com" Message-Id: References: <149899773681.17431.10285629192748593381@ietfa.amsl.com> To: Dhruv Dhody X-Mailer: Apple Mail (2.2098) X-Mailcore-Auth: 9600544 X-Mailcore-Domain: 172912 X-KLMS-Rule-ID: 1 X-KLMS-Message-Action: clean X-KLMS-AntiSpam-Status: not scanned, license restriction X-KLMS-AntiPhishing: not scanned, license restriction X-KLMS-AntiVirus: Kaspersky Security 8.0 for Linux Mail Server, version 8.0.1.721, bases: 2017/07/02 11:49:00 #9933356 X-KLMS-AntiVirus-Status: Clean, skipped Archived-At: Subject: Re: [Pce] Rtgdir last call review of draft-ietf-pce-rfc6006bis-02 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 02 Jul 2017 17:20:30 -0000 --Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Dhruv, > On 2 Jul 2017, at 17:08, Dhruv Dhody wrote: >=20 > Hi Ben, >=20 > Thanks for your review. Please see inline. >=20 > On Sunday 02 July 2017 05:45 PM, Ben Niven-Jenkins wrote: >> 3) Section 5 says =E2=80=9CPCEP implementations SHOULD consider the = additional security >> provided by Transport Layer Security (TLS) [I-D.ietf-pce-pceps].=E2=80=9D= >>=20 >> Use of SHOULD says to me you expect the majority of implementations = to >> implement I-D.ietf-pce-pceps. So should the reference to = I-D.ietf-pce-pceps be >> normative? >=20 > [Dhruv]:Hmm, you may be right. > It just that other documents have put this down as Informative = usually. PCEPS is also in publication process, so normative reference = will most likely not block progress. I am not sure if we should deviate = in this document. Thoughts? I don=E2=80=99t have a strong opinion, I point it out as something that = struck me as a possible oversight. If the authors & ADs are happy for it = to be an informative reference, that=E2=80=99s fine with me. >> 4) Section 6.5 - PCEP Objects. Should you specify the meaning of = Object-Types >> 0, 1 & 2 for the END-POINTS object, like you do for the other objects = in this >> section? >=20 > [Dhruv]: END-POINTS is an existing object defined in RFC5440. This = document defines new object-types for the END-POINTS object. Thus I = don't think there is a reason to mention 0,1 & 2. Fair enough. Ben --Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi Dhruv,

On 2 Jul 2017, at 17:08, Dhruv = Dhody <dhruv.ietf@gmail.com> wrote:

Hi Ben,

Thanks for your review. Please see = inline.

On Sunday 02 July 2017 = 05:45 PM, Ben Niven-Jenkins wrote:
3) Section 5 says = =E2=80=9CPCEP implementations SHOULD consider the additional = security
provided by Transport Layer = Security (TLS) [I-D.ietf-pce-pceps].=E2=80=9D

Use of SHOULD says to me you expect the majority of = implementations to
implement I-D.ietf-pce-pceps. So should = the reference to I-D.ietf-pce-pceps be
normative?

[Dhruv]:Hmm, you may be = right.
It just that other = documents have put this down as Informative usually. PCEPS is also in = publication process, so normative reference will most likely not block = progress. I am not sure if we should deviate in this document. = Thoughts?

I don=E2=80=99t = have a strong opinion, I point it out as something that struck me as a = possible oversight. If the authors & ADs are happy for it to be an = informative reference, that=E2=80=99s fine with me.

4) Section 6.5 - PCEP Objects. Should you specify the = meaning of Object-Types
0, 1 & 2 for the END-POINTS = object, like you do for the other objects in this
section?

[Dhruv]: END-POINTS is an existing object = defined in RFC5440. This document defines new object-types for the = END-POINTS object. Thus I don't think there is a reason to mention 0,1 = & 2.

Fair = enough.

Ben

= --Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39-- From nobody Sun Jul 2 11:53:26 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E3081270A7; Sun, 2 Jul 2017 11:53:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.699 X-Spam-Level: X-Spam-Status: No, score=-4.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-2.8] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IIUqZoc7dQZX; Sun, 2 Jul 2017 11:53:18 -0700 (PDT) Received: from mailex.mailcore.me (mailex.mailcore.me [94.136.40.146]) by ietfa.amsl.com (Postfix) with ESMTP id 17C8A126B6E; Sun, 2 Jul 2017 11:53:17 -0700 (PDT) Received: from [176.24.45.127] (helo=[192.168.0.6]) by smtp04.mailcore.me with esmtpa (Exim 4.89) (envelope-from ) id 1dRjzg-000BpW-H1; Sun, 02 Jul 2017 19:53:16 +0100 Content-Type: multipart/alternative; boundary="Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39" Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\)) From: Ben Niven-Jenkins In-Reply-To: Date: Sun, 2 Jul 2017 18:20:23 +0100 Cc: rtg-dir@ietf.org, draft-ietf-pce-rfc6006bis.all@ietf.org, pce@ietf.org, rtg-ads@ietf.org, "dhruv.dhody@huawei.com" Message-Id: References: <149899773681.17431.10285629192748593381@ietfa.amsl.com> To: Dhruv Dhody X-Mailer: Apple Mail (2.2098) X-Mailcore-Auth: 9600544 X-Mailcore-Domain: 172912 X-KLMS-Rule-ID: 1 X-KLMS-Message-Action: clean X-KLMS-AntiSpam-Status: not scanned, license restriction X-KLMS-AntiPhishing: not scanned, license restriction X-KLMS-AntiVirus: Kaspersky Security 8.0 for Linux Mail Server, version 8.0.1.721, bases: 2017/07/02 11:49:00 #9933356 X-KLMS-AntiVirus-Status: Clean, skipped Archived-At: Subject: Re: [Pce] Rtgdir last call review of draft-ietf-pce-rfc6006bis-02 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 02 Jul 2017 18:53:19 -0000 --Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Dhruv, > On 2 Jul 2017, at 17:08, Dhruv Dhody wrote: >=20 > Hi Ben, >=20 > Thanks for your review. Please see inline. >=20 > On Sunday 02 July 2017 05:45 PM, Ben Niven-Jenkins wrote: >> 3) Section 5 says =E2=80=9CPCEP implementations SHOULD consider the = additional security >> provided by Transport Layer Security (TLS) [I-D.ietf-pce-pceps].=E2=80=9D= >>=20 >> Use of SHOULD says to me you expect the majority of implementations = to >> implement I-D.ietf-pce-pceps. So should the reference to = I-D.ietf-pce-pceps be >> normative? >=20 > [Dhruv]:Hmm, you may be right. > It just that other documents have put this down as Informative = usually. PCEPS is also in publication process, so normative reference = will most likely not block progress. I am not sure if we should deviate = in this document. Thoughts? I don=E2=80=99t have a strong opinion, I point it out as something that = struck me as a possible oversight. If the authors & ADs are happy for it = to be an informative reference, that=E2=80=99s fine with me. >> 4) Section 6.5 - PCEP Objects. Should you specify the meaning of = Object-Types >> 0, 1 & 2 for the END-POINTS object, like you do for the other objects = in this >> section? >=20 > [Dhruv]: END-POINTS is an existing object defined in RFC5440. This = document defines new object-types for the END-POINTS object. Thus I = don't think there is a reason to mention 0,1 & 2. Fair enough. Ben --Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi Dhruv,

On 2 Jul 2017, at 17:08, Dhruv = Dhody <dhruv.ietf@gmail.com> wrote:

Hi Ben,

Thanks for your review. Please see = inline.

On Sunday 02 July 2017 = 05:45 PM, Ben Niven-Jenkins wrote:
3) Section 5 says = =E2=80=9CPCEP implementations SHOULD consider the additional = security
provided by Transport Layer = Security (TLS) [I-D.ietf-pce-pceps].=E2=80=9D

Use of SHOULD says to me you expect the majority of = implementations to
implement I-D.ietf-pce-pceps. So should = the reference to I-D.ietf-pce-pceps be
normative?

[Dhruv]:Hmm, you may be = right.
It just that other = documents have put this down as Informative usually. PCEPS is also in = publication process, so normative reference will most likely not block = progress. I am not sure if we should deviate in this document. = Thoughts?

I don=E2=80=99t = have a strong opinion, I point it out as something that struck me as a = possible oversight. If the authors & ADs are happy for it to be an = informative reference, that=E2=80=99s fine with me.

4) Section 6.5 - PCEP Objects. Should you specify the = meaning of Object-Types
0, 1 & 2 for the END-POINTS = object, like you do for the other objects in this
section?

[Dhruv]: END-POINTS is an existing object = defined in RFC5440. This document defines new object-types for the = END-POINTS object. Thus I don't think there is a reason to mention 0,1 = & 2.

Fair = enough.

Ben

= --Apple-Mail=_9619BE4F-C095-4565-9B85-02689330DE39-- From nobody Sun Jul 2 21:23:44 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 07597128C81; Sun, 2 Jul 2017 21:23:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.221 X-Spam-Level: X-Spam-Status: No, score=-4.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id caVGcH5efpEF; Sun, 2 Jul 2017 21:23:41 -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 908BC124D6C; 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charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020205.5959C6CB.002B, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.2.48, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: a236b5376e5582c9bde5f42340fa6cf8 Archived-At: Subject: Re: [Pce] New Version Notification for draft-tanaka-pce-stateful-pce-mbb-04.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jul 2017 04:23:43 -0000 SGkgV0csIA0KDQpXZSBoYXZlIHVwZGF0ZSB0aGUgU3RhdGVmdWwgUENFIG1ha2UtYmVmb3JlLWJy ZWFrIGRyYWZ0LiBJdCB1c2VzIHRoZSBiYXNlIGFzc29jaWF0aW9uIGRyYWZ0IGJ5IGNyZWF0aW5n IGEgbmV3IGFzc29jaWF0aW9uIHR5cGUgZm9yIGV4cGxpY2l0IE1CQi4gDQoNClRoZSBtYWluIGNo YW5nZXMgYXJlIOKAkyANCg0KLSAgICAgICBVc2Ugb2YgYmFzZSBBU1NPQ0lBVElPTiBvYmplY3QN Ci0gICAgICAgVXBkYXRlZCB0aGUgVHJpYWwgTFNQIFRMViBhcyBwZXIgQVNTT0NJQVRJT04gb2Jq ZWN0IHNlbWFudGljcy4NCg0KVGhhbmtzICYgUmVnYXJkcywNClJhbWFuamFuZXlhDQoNCi0tLS0t T3JpZ2luYWwgTWVzc2FnZS0tLS0tDQpGcm9tOiBpbnRlcm5ldC1kcmFmdHNAaWV0Zi5vcmcgW21h aWx0bzppbnRlcm5ldC1kcmFmdHNAaWV0Zi5vcmddIA0KU2VudDogMjggSnVuZSAyMDE3IDExOjQ4 DQpUbzogWW9zdWtlIFRhbmFrYTsgUmFtYW5qYW5leWEgcGFsbGV0aTsgRGhydXYgRGhvZHk7IFJh bWFuamFuZXlhIHBhbGxldGk7IFl1amkgS2FtaXRlDQpTdWJqZWN0OiBOZXcgVmVyc2lvbiBOb3Rp ZmljYXRpb24gZm9yIGRyYWZ0LXRhbmFrYS1wY2Utc3RhdGVmdWwtcGNlLW1iYi0wNC50eHQNCg0K DQpBIG5ldyB2ZXJzaW9uIG9mIEktRCwgZHJhZnQtdGFuYWthLXBjZS1zdGF0ZWZ1bC1wY2UtbWJi LTA0LnR4dA0KaGFzIGJlZW4gc3VjY2Vzc2Z1bGx5IHN1Ym1pdHRlZCBieSBEaHJ1diBEaG9keSBh bmQgcG9zdGVkIHRvIHRoZSBJRVRGIHJlcG9zaXRvcnkuDQoNCk5hbWU6CQlkcmFmdC10YW5ha2Et cGNlLXN0YXRlZnVsLXBjZS1tYmINClJldmlzaW9uOgkwNA0KVGl0bGU6CQlNYWtlLUJlZm9yZS1C cmVhayBNUExTLVRFIExTUCByZXN0b3JhdGlvbiBhbmQgcmVvcHRpbWl6YXRpb24gcHJvY2VkdXJl IHVzaW5nIFN0YXRlZnVsIFBDRQ0KRG9jdW1lbnQgZGF0ZToJMjAxNy0wNi0yNw0KR3JvdXA6CQlJ bmRpdmlkdWFsIFN1Ym1pc3Npb24NClBhZ2VzOgkJMTcNClVSTDogICAgICAgICAgICBodHRwczov L3d3dy5pZXRmLm9yZy9pbnRlcm5ldC1kcmFmdHMvZHJhZnQtdGFuYWthLXBjZS1zdGF0ZWZ1bC1w Y2UtbWJiLTA0LnR4dA0KU3RhdHVzOiAgICAgICAgIGh0dHBzOi8vZGF0YXRyYWNrZXIuaWV0Zi5v cmcvZG9jL2RyYWZ0LXRhbmFrYS1wY2Utc3RhdGVmdWwtcGNlLW1iYi8NCkh0bWxpemVkOiAgICAg ICBodHRwczovL3Rvb2xzLmlldGYub3JnL2h0bWwvZHJhZnQtdGFuYWthLXBjZS1zdGF0ZWZ1bC1w Y2UtbWJiLTA0DQpIdG1saXplZDogICAgICAgaHR0cHM6Ly9kYXRhdHJhY2tlci5pZXRmLm9yZy9k b2MvaHRtbC9kcmFmdC10YW5ha2EtcGNlLXN0YXRlZnVsLXBjZS1tYmItMDQNCkRpZmY6ICAgICAg ICAgICBodHRwczovL3d3dy5pZXRmLm9yZy9yZmNkaWZmP3VybDI9ZHJhZnQtdGFuYWthLXBjZS1z dGF0ZWZ1bC1wY2UtbWJiLTA0DQoNCkFic3RyYWN0Og0KICAgU3RhdGVmdWwgUGF0aCBDb21wdXRh dGlvbiBFbGVtZW50IChQQ0UpIGFuZCBpdHMgY29ycmVzcG9uZGluZw0KICAgcHJvdG9jb2wgZXh0 ZW5zaW9ucyBwcm92aWRlIGEgbWVjaGFuaXNtIHRoYXQgZW5hYmxlcyBQQ0UgdG8gZG8NCiAgIHN0 YXRlZnVsIGNvbnRyb2wgb2YgTXVsdGlwcm90b2NvbCBMYWJlbCBTd2l0Y2hpbmcgKE1QTFMpIFRy YWZmaWMNCiAgIEVuZ2luZWVyaW5nIExhYmVsIFN3aXRjaGVkIFBhdGhzIChURSBMU1ApLiAgU3Rh dGVmdWwgUENFIHN1cHBvcnRzDQogICBtYW5pcHVsYXRpbmcgb2YgdGhlIGV4aXN0aW5nIExTUCdz IHN0YXRlIGFuZCBhdHRyaWJ1dGVzIChlLmcuLA0KICAgYmFuZHdpZHRoIGFuZCBwYXRoKSB2aWEg ZGVsZWdhdGlvbiBhbmQgYWxzbyBpbnN0YW50aWF0aW9uIG9mIG5ldyBMU1BzDQogICBpbiB0aGUg bmV0d29yayB2aWEgUENFIEluaXRpYXRpb24gcHJvY2VkdXJlcy4NCg0KICAgSW4gdGhlIGN1cnJl bnQgTVBMUyBURSBuZXR3b3JrIHVzaW5nIFJlc291cmNlIFJlU2VyVmF0aW9uIFByb3RvY29sDQog ICAoUlNWUC1URSksIExTUHMgYXJlIG9mdGVuIGNvbnRyb2xsZWQgYnkgTWFrZS1iZWZvcmUtYnJl YWsgKE0tQi1CKQ0KICAgc2lnbmFsaW5nIGJ5IHRoZSBoZWFkZW5kIGZvciB0aGUgcHVycG9zZSBv ZiBMU1AgcmVzdG9yYXRpb24gYW5kDQogICByZW9wdGltaXphdGlvbi4gIEluIG1vc3QgY2FzZXMs IGl0IGlzIGFuIGVzc2VudGlhbCBvcGVyYXRpb24gdG8NCiAgIHJlcm91dGUgTFNQIHRyYWZmaWMg d2l0aG91dCBhbnkgZGF0YSBkaXNydXB0aW9uLg0KDQogICBUaGlzIGRvY3VtZW50IHNwZWNpZmll cyB0aGUgcHJvY2VkdXJlIG9mIGFwcGx5aW5nIHN0YXRlZnVsIFBDRSdzDQogICBjb250cm9sIHRv IG1ha2UtYmVmb3JlLWJyZWFrIFJTVlAtVEUgc2lnbmFsaW5nLiAgSW4gdGhpcyBkb2N1bWVudCwN CiAgIHR3byB0eXBlcyBvZiByZXN0b3JhdGlvbi9yZW9wdGltaXphdGlvbiBwcm9jZWR1cmVzIGFy ZSBkZWZpbmVkLA0KICAgaW1wbGljaXQgbW9kZSBhbmQgZXhwbGljaXQgbW9kZS4gIFRoaXMgZG9j dW1lbnQgYWxzbyBzcGVjaWZpZXMgdGhlDQogICB1c2FnZSBhbmQgaGFuZGxpbmcgb2Ygc3RhdGVm dWwgUENFUCAoUENFIENvbW11bmljYXRpb24gUHJvdG9jb2wpDQogICBtZXNzYWdlcywgZXhwZWN0 ZWQgYmVoYXZpb3Igb2YgUENDIGFzIFJTVlAtVEUgaGVhZGVuZCBhbmQgbmVjZXNzYXJ5DQogICBl eHRlbnNpb25zIG9mIGFkZGl0aW9uYWwgUENFUCBvYmplY3RzLg0KDQogICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgDQoNCg0KUGxlYXNlIG5vdGUgdGhhdCBpdCBtYXkgdGFrZSBhIGNvdXBsZSBvZiBt aW51dGVzIGZyb20gdGhlIHRpbWUgb2Ygc3VibWlzc2lvbiB1bnRpbCB0aGUgaHRtbGl6ZWQgdmVy c2lvbiBhbmQgZGlmZiBhcmUgYXZhaWxhYmxlIGF0IHRvb2xzLmlldGYub3JnLg0KDQpUaGUgSUVU RiBTZWNyZXRhcmlhdA0KDQo= From nobody Sun Jul 2 22:38:14 2017 Return-Path: X-Original-To: pce@ietf.org Delivered-To: pce@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 0FB69126D85; Sun, 2 Jul 2017 22:38:13 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: pce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.55.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149906029302.4910.18144330970556783165@ietfa.amsl.com> Date: Sun, 02 Jul 2017 22:38:13 -0700 Archived-At: Subject: [Pce] I-D Action: draft-ietf-pce-stateful-pce-p2mp-04.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jul 2017 05:38:13 -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 of the IETF. Title : Path Computation Element (PCE) Protocol Extensions for Stateful PCE usage for Point-to-Multipoint Traffic Engineering Label Switched Paths Authors : Udayasree Palle Dhruv Dhody Yosuke Tanaka Vishnu Pavan Beeram Filename : draft-ietf-pce-stateful-pce-p2mp-04.txt Pages : 32 Date : 2017-07-02 Abstract: The Path Computation Element (PCE) has been identified as an appropriate technology for the determination of the paths of point- to-multipoint (P2MP) TE LSPs. This document provides extensions required for Path Computation Element communication Protocol (PCEP) so as to enable the usage of a stateful PCE capability in supporting P2MP TE LSPs. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-stateful-pce-p2mp/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-pce-stateful-pce-p2mp-04 https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-pce-p2mp-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-pce-p2mp-04 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 Sun Jul 2 22:58:14 2017 Return-Path: X-Original-To: pce@ietf.org Delivered-To: pce@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id AD95613145E; Sun, 2 Jul 2017 22:58:12 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: pce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.55.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149906149266.5029.17993134757044918678@ietfa.amsl.com> Date: Sun, 02 Jul 2017 22:58:12 -0700 Archived-At: Subject: [Pce] I-D Action: draft-ietf-pce-rfc6006bis-03.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jul 2017 05:58:13 -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 of the IETF. Title : Extensions to the Path Computation Element Communication Protocol (PCEP) for Point-to-Multipoint Traffic Engineering Label Switched Paths Authors : Quintin Zhao Dhruv Dhody Ramanjaneya Reddy Palleti Daniel King Filename : draft-ietf-pce-rfc6006bis-03.txt Pages : 40 Date : 2017-07-02 Abstract: Point-to-point Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering Label Switched Paths (TE LSPs) may be established using signaling techniques, but their paths may first need to be determined. The Path Computation Element (PCE) has been identified as an appropriate technology for the determination of the paths of point-to-multipoint (P2MP) TE LSPs. This document describes extensions to the PCE communication Protocol (PCEP) to handle requests and responses for the computation of paths for P2MP TE LSPs. This document obsoletes RFC 6006. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-rfc6006bis/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-pce-rfc6006bis-03 https://datatracker.ietf.org/doc/html/draft-ietf-pce-rfc6006bis-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-rfc6006bis-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 Sun Jul 2 23:09:51 2017 Return-Path: X-Original-To: pce@ietf.org Delivered-To: pce@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D19313146A; Sun, 2 Jul 2017 23:09:44 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: pce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.55.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149906218460.4978.6674526999840358562@ietfa.amsl.com> Date: Sun, 02 Jul 2017 23:09:44 -0700 Archived-At: Subject: [Pce] I-D Action: draft-ietf-pce-pcep-exp-codepoints-01.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jul 2017 06:09:45 -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 of the IETF. Title : Experimental Codepoint Allocation for Path Computation Element communication Protocol (PCEP) Authors : Dhruv Dhody Daniel King Filename : draft-ietf-pce-pcep-exp-codepoints-01.txt Pages : 6 Date : 2017-07-02 Abstract: IANA assigns values to the Path Computation Element (PCE) communication Protocol (PCEP) parameters (messages, objects, TLVs). IANA established a new top-level registry to contain all PCEP codepoints and sub-registries. The allocation policy for each new registry is by IETF Consensus. This document seeks to mark some codepoints for experimental usage of PCEP. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-pcep-exp-codepoints/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-pce-pcep-exp-codepoints-01 https://datatracker.ietf.org/doc/html/draft-ietf-pce-pcep-exp-codepoints-01 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-pcep-exp-codepoints-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 Jul 3 10:21:23 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 12875126D05; Mon, 3 Jul 2017 10:21:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.523 X-Spam-Level: X-Spam-Status: No, score=-14.523 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r0mKUDF1njdz; Mon, 3 Jul 2017 10:21:20 -0700 (PDT) Received: from alln-iport-8.cisco.com (alln-iport-8.cisco.com [173.37.142.95]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 99F4112896F; Mon, 3 Jul 2017 10:13:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=945; q=dns/txt; s=iport; t=1499102023; x=1500311623; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=tkP9VQ1PwQ8mfAGQUhNYt6mHT0UZtmwexOQd86gvIkM=; b=O8whJTH0ngbN9+Bvimvq1AM8uFidBN6Riq7r/XxETpLVfZxaTugZAnnO 4GFEcA5LJuBxG3jtPuR3kH2bZc5cRFOYKR/CFPnI60x3SUz2xBMtt6hib +YnqR7qEDM9j8GUoBLxwMx6SMQrGbhSh1ARQ9GmyJQri4QGbIZE6FDAJH 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DIAACVelpZ/5hdJa1cGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBg1mBeI1+kXKVfYIRhhwCgng/GAECAQEBAQEBAWsohRgBAQEBAgE6PwU?= =?us-ascii?q?LAgEINhAyJQEBBAENDYofCLImi0QBAQEBAQEBAQEBAQEBAQEBAQEBAQEdgyeDT?= =?us-ascii?q?IFhgySKXgEElyiHVwKTdoIVhUqKR5UvAR84gQp1FYdeiHWBDQEBAQ?= X-IronPort-AV: E=Sophos;i="5.40,304,1496102400"; d="scan'208";a="449507421" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by alln-iport-8.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Jul 2017 17:13:42 +0000 Received: from XCH-ALN-001.cisco.com (xch-aln-001.cisco.com [173.36.7.11]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id v63HDg2s003592 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 3 Jul 2017 17:13:42 GMT Received: from xch-rcd-001.cisco.com (173.37.102.11) by XCH-ALN-001.cisco.com (173.36.7.11) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 3 Jul 2017 12:13:42 -0500 Received: from xch-rcd-001.cisco.com ([173.37.102.11]) by XCH-RCD-001.cisco.com ([173.37.102.11]) with mapi id 15.00.1210.000; Mon, 3 Jul 2017 12:13:42 -0500 From: "Matt Hartley (mhartley)" To: "TEAS WG (teas@ietf.org)" , "ccamp@ietf.org" , "pce@ietf.org" , "mpls@ietf.org" CC: "teas-chairs@ietf.org" , "Matt Hartley (mhartley)" Thread-Topic: Agenda for Joint Yang WG session in Prague Thread-Index: AdLvjgoSaBfnmsHxTqCqVsjaruTqnAAk39mQAP+JQyA= Date: Mon, 3 Jul 2017 17:13:41 +0000 Message-ID: <388785f3f50e430db2afc91ba6a43433@XCH-RCD-001.cisco.com> References: <169daa25ca484ed1ad79f140cad6c250@XCH-RCD-001.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.86.244.71] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [Pce] Agenda for Joint Yang WG session in Prague X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jul 2017 17:21:21 -0000 Final reminder! Matt > A clarification on this: keep in mind that the joint session is intended > to provide a forum for raising YANG related issues or impacts that relate > to more than one of the participating WGs (PCE, CCAMP, MPLS, and TEAS). > Simple updates or single WG issues should be discussed in the respective > WG session. >=20 > Matt/Lou/Pavan >=20 > > All, > > > > Once again, we'll be having a joint Yang session. This time, TEAS is > > hosting, which means I get to organize the agenda. > > > > We're meeting at 13:30 - 15:30 on Thursday July 20th. Please send slot > > requests for the TEAS session to me by the end of the day on Monday, > > July 3rd (that's next week). Note that this is also the deadline for > > draft submission. > > > > We'll need slides for presentation by Friday, July 14th so that we can > > get them ready to present over the weekend. > > > > Cheers > > > > Matt/Lou/Pavan From nobody Fri Jul 7 00:48:08 2017 Return-Path: X-Original-To: pce@ietf.org Delivered-To: pce@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 643E913164A; Thu, 6 Jul 2017 09:26:28 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Liaison Statement Management Tool To: "Daniele Ceccarelli" , "Julien Meuric" , "Stewart Bryant" , "Jonathan Hardwick" , "Fatai Zhang" , "George Swallow" , "Nicolai Leymann" , "Andrew Malis" , "Loa Andersson" , "Lou Berger" , "Vishnu Pavan Beeram" , "JP Vasseur" Cc: Deborah Brungard , Julien Meuric , Multiprotocol Label Switching Discussion List , Pseudowire And LDP-enabled Services Discussion List , Andrew Malis , Common Control and Measurement Plane Discussion List , Nicolai Leymann , Scott Mansfield , Fatai Zhang , George Swallow , Traffic Engineering Architecture and Signaling Discussion List , John Drake , Loa Andersson , Alvaro Retana , Daniele Ceccarelli , Vishnu Beeram , Stewart Bryant , Jonathan Hardwick , Path Computation Element Discussion List , Alia Atlas , Lou Berger , itu-t-liaison@iab.org, naotaka.morita@ntt-at.co.jp, JP Vasseur X-Test-IDTracker: no X-IETF-IDTracker: 6.55.2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149935838839.2367.6177311269241765923.idtracker@ietfa.amsl.com> Date: Thu, 06 Jul 2017 09:26:28 -0700 Archived-At: X-Mailman-Approved-At: Fri, 07 Jul 2017 00:48:08 -0700 Subject: [Pce] New Liaison Statement, "LS on OTNT Standardization Work Plan" X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jul 2017 16:26:29 -0000 Title: LS on OTNT Standardization Work Plan Submission Date: 2017-07-06 URL of the IETF Web page: https://datatracker.ietf.org/liaison/1532/ Please reply by 2018-01-16 From: Hiroshi Ota To: Vishnu Pavan Beeram , Lou Berger ,Nicolai Leymann ,Loa Andersson ,George Swallow ,Andrew Malis ,Stewart Bryant ,Jonathan Hardwick ,JP Vasseur ,Julien Meuric ,Daniele Ceccarelli ,Fatai Zhang Cc: Deborah Brungard ,Julien Meuric ,Multiprotocol Label Switching Discussion List ,Pseudowire And LDP-enabled Services Discussion List ,Andrew Malis ,Common Control and Measurement Plane Discussion List ,Nicolai Leymann ,Scott Mansfield ,Fatai Zhang ,George Swallow ,Traffic Engineering Architecture and Signaling Discussion List ,John Drake ,Loa Andersson ,Alvaro Retana ,Daniele Ceccarelli ,Vishnu Beeram ,Stewart Bryant ,Jonathan Hardwick ,Path Computation Element Discussion List ,Alia Atlas ,Lou Berger ,itu-t-liaison@iab.org,JP Vasseur Response Contacts: naotaka.morita@ntt-at.co.jp Technical Contacts: Purpose: For comment Body: Thank you for your review and comments on “Optical Transport Networks & Technologies Standardization Work Plan.” Attached is Issue 23, the latest version updated by the SG15 meeting in June 2017. Editor of the document thanks you for your continued support and the information provided. >From the previous issue (Issue 22), the document is split into two parts to separate up-to-date snapshot-type information and comprehensive database-type information. - Part 1 provides highlights of relevant SDOs’ activity. - Part 2 updated. Splitting the document into the two parts is intended to make this information more useful and attractive to the potential readers. ITU-T SG15 is considering more effective way to provide the information and more efficient way to maintain and update it. For example for Part 1, setting up the template for reporting. For Part 2, automated production based on database is under consideration. Again, any comments, not only the correction/update of the information but also the ways to provide the information are highly appreciated. Attachments: OTNT Standardization Work Plan, Issue 23 (TD55r1/PLEN) https://www.ietf.org/lib/dt/documents/LIAISON/liaison-2017-07-06-itu-t-sg-15-mpls-ccamp-pce-pals-teas-ls-on-otnt-standardization-work-plan-attachment-1.pdf From nobody Mon Jul 10 09:11:53 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 108461317D3 for ; Mon, 10 Jul 2017 09:11:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.235 X-Spam-Level: X-Spam-Status: No, score=-1.235 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RP_MATCHES_RCVD=-0.001, SPF_SOFTFAIL=0.665] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4FIbpvgONcbG for ; Mon, 10 Jul 2017 09:11:43 -0700 (PDT) Received: from p-mail2.rd.orange.com (p-mail2.rd.orange.com [161.106.1.3]) by ietfa.amsl.com (Postfix) with ESMTP id 246CC1317C4 for ; Mon, 10 Jul 2017 09:11:43 -0700 (PDT) Received: from p-mail2.rd.orange.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 64286E3007C for ; Mon, 10 Jul 2017 18:11:42 +0200 (CEST) Received: from FTRDCH01.rd.francetelecom.fr (unknown [10.194.32.11]) by p-mail2.rd.orange.com (Postfix) with ESMTP id 4B7BEE3007B for ; Mon, 10 Jul 2017 18:11:42 +0200 (CEST) Received: from [10.193.71.121] (10.193.71.121) by FTRDCH01.rd.francetelecom.fr (10.194.32.11) with Microsoft SMTP Server id 14.3.319.2; Mon, 10 Jul 2017 18:11:41 +0200 To: "pce@ietf.org" References: Reply-To: Jonathan Hardwick , 'JP Vasseur' , Dhruv Dhody , Julien Meuric From: Julien Meuric Organization: Orange Message-ID: <0d0e425d-92ec-7bec-8e97-d21ec1843fd0@orange.com> Date: Mon, 10 Jul 2017 18:11:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [Pce] Building the PCE Agenda for IETF 99 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jul 2017 16:11:44 -0000 Hi all, The tentative agenda for our upcoming meeting is on line since last week. Without further comments, it will be used as a final version. Presenters, if you have a slot, please send your slides to the chairs and secretary by Saturday, 15th. Thanks, Jon, JP & Julien Jun. 23, 2017 - julien.meuric@orange.com: > Hi all, > > The PCE WG session in Prague is tentatively scheduled on Tuesday 3:50pm > (facing I2RS). > If you need meeting time to progress some work, please send a request to > the chairs and secretary by Monday July 3, including: > - the associated I-D(s), > - the expected presenter, > - the requested duration, > - the motivation to request some face-to-face time as opposed to using > the mailing list to progress your work. > > Regards, > > Jon, JP & Julien > From nobody Tue Jul 11 08:41:38 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5879A128B8F; Tue, 11 Jul 2017 08:41:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E6PHgBWlxx5u; Tue, 11 Jul 2017 08:41:17 -0700 (PDT) Received: from rcdn-iport-9.cisco.com (rcdn-iport-9.cisco.com [173.37.86.80]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A441B131737; Tue, 11 Jul 2017 08:41:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=853; q=dns/txt; s=iport; t=1499787676; x=1500997276; h=from:to:cc:subject:date:message-id: content-transfer-encoding:mime-version; bh=r48oKobo1D0J9wxD50wr2s9SC+EApIbB78rxS53fj/U=; b=e6Y+gMsCd22ymDpLz18s4q55p2bDhSCuxZ/tFq6FADt90gK88Sk5x8Z6 RZRT0UGtwSJ7f1dafVpskox0PecjKVhyT8XOV/XbrcuO36REIYeyEZX+a x2nmdQaHosuZI8nZ42vE3JLZfXEMRXNqClR2wiAllpXB0wtvGj2SK2HnS I=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AEAQAv8WRZ/5hdJa1dGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBg1pkgRuOAqdxghEshUqDPj8YAQIBAQEBAQEBayhCDoRKBDs/BQ0BPkI?= =?us-ascii?q?mAQQBDQ2KHwgQriWLNAEBAQEBAQEBAQEBAQEBAQEBAQEBARgFgyiDTYFhjgIFn?= =?us-ascii?q?yQCgWSFYow7ghWFS4pOlUYBHziBCnUVh1+GNYFiAYEMAQEB?= X-IronPort-AV: E=Sophos;i="5.40,347,1496102400"; d="scan'208";a="266520284" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-9.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2017 15:41:12 +0000 Received: from XCH-RCD-004.cisco.com (xch-rcd-004.cisco.com [173.37.102.14]) by rcdn-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id v6BFfDCV024074 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Tue, 11 Jul 2017 15:41:13 GMT Received: from xch-rcd-001.cisco.com (173.37.102.11) by XCH-RCD-004.cisco.com (173.37.102.14) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 11 Jul 2017 10:41:12 -0500 Received: from xch-rcd-001.cisco.com ([173.37.102.11]) by XCH-RCD-001.cisco.com ([173.37.102.11]) with mapi id 15.00.1210.000; Tue, 11 Jul 2017 10:41:12 -0500 From: "Matt Hartley (mhartley)" To: "TEAS WG (teas@ietf.org)" , "ccamp@ietf.org" , "pce@ietf.org" , "mpls@ietf.org" CC: "teas-chairs@ietf.org" , "Matt Hartley (mhartley)" Thread-Topic: Slides for Joint Yang WG session in Prague Thread-Index: AdL6W+bJV9xmLUZ1SyONwk30AFcM1w== Date: Tue, 11 Jul 2017 15:41:12 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [161.44.213.22] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: [Pce] Slides for Joint Yang WG session in Prague X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Jul 2017 15:41:18 -0000 All, A reminder for folks presenting in the joint yang session in Prague: please= send slides by the end of Friday so that we can get them posted well in ad= vance. The agenda is at https://datatracker.ietf.org/meeting/99/agenda/teas/ (seco= nd session). Cheers Matt/Lou/Pavan > All, >=20 > Once again, we'll be having a joint Yang session. This time, TEAS is > hosting, which means I get to organize the agenda. >=20 > We're meeting at 13:30 - 15:30 on Thursday July 20th. Please send slot > requests for the TEAS session to me by the end of the day on Monday, July > 3rd (that's next week). Note that this is also the deadline for draft > submission. >=20 > We'll need slides for presentation by Friday, July 14th so that we can ge= t > them ready to present over the weekend. >=20 > Cheers >=20 > Matt/Lou/Pavan From nobody Tue Jul 11 20:08:37 2017 Return-Path: X-Original-To: pce@ietf.org Delivered-To: pce@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 450BB12F290; Tue, 11 Jul 2017 20:08:17 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Dale Worley To: Cc: draft-ietf-pce-pceps.all@ietf.org, pce@ietf.org, ietf@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.55.3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <149982889725.9262.6380278547558008402@ietfa.amsl.com> Date: Tue, 11 Jul 2017 20:08:17 -0700 Archived-At: Subject: [Pce] Genart last call review of draft-ietf-pce-pceps-14 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Jul 2017 03:08:17 -0000 Reviewer: Dale Worley Review result: Ready with Nits I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please treat these comments just like any other last call comments. For more information, please see the FAQ at . Document: draft-ietf-pce-pceps-14 Reviewer: Dale R. Worley Review Date: 2017-07-11 IETF LC End Date: 2017-07-12 IESG Telechat date: 2017-08-03 Summary: This draft is basically ready for publication, but has nits that should be fixed before publication. Nits/editorial comments: A few of these may rise to the level of minor technical issues, especially: section 3.2: whether error TBA2/2 is distinct from error 1/1 section 3.2: the receipt of an PCErr during the failure of TLS establishment section 3.3: the distinction between StartTLSWait and OpenWait section 5: a full discussion of backward compatibility considerations section 8.2: MIB extension 1. Introduction This document describes a security container for the transport of PCEP messages, and therefore they do not affect the flexibility and extensibility of PCEP. There is no plural antecedent for "they" to reference. I think you could use "it", but the Editor may have better suggestions. 3.2. Initiating the TLS Procedures with a PCErr message with Error-Type set to [TBA2 by IANA] (PCEP StartTLS failure) It seems that we shouldn't use this Error-Type to object to the use of a message other than Open and StartTLS as an initial message, as that error isn't a misuse of StartTLS per se and is only incidentally related to StartTLS. Indeed, isn't there already an Error-Type for this error (unexpected initial message), since two RFC 5440 implementations can commit/detect it? Looking at RFC 5440 section 7.15, I see: Error-Type Meaning 1 PCEP session establishment failure Error-value=1: reception of an invalid Open message or a non Open message. It seems to me that this document is adjusting the meaning of error 1/1, rather than defining a new error situation. If the PCEP speaker that does not support PCEPS, receives a StartTLS message, it MUST behave according to the existing error mechanism described in section 6.2 of [RFC5440] (in case message is received prior to an Open message) or section 6.9 of [RFC5440] (for the case of reception of unknown message). I think you want s/MUST/will/, since the described behavior isn't specified by this document, but rather by RFC 5440. In any case, this paragraph might want to reference the backward-compatibility consideration that I would expect to appear in section 5 -- How does the PCEPS-supporting element deal with the non-PCEPS-supporting element after the connection attempt with StartTLS fails? After the exchange of startTLS messages, if a PCEP speaker cannot establish a TLS connection for some reason (e.g. the required mechanisms for certificate revocation checking are not available), it MUST return a PCErr message (in clear) with Error-Type set to [TBA2 by IANA] (PCEP StartTLS failure) and Error-value set to: s/startTLS/StartTLS/ Is there a well-defined way for a participant in a TLS connection start to receive *either* a PCErr message in the clear *or* whatever comes next in TLS setup -- and know which case has happened? Is there a way to use popular modular TLS libraries and have the application above the library receive such a PCErr message? I don't understand TLS nearly well enough to know the answer to this, but it would probably help implementors if answers were given to these questions. The peer MAY choose to re-establish the PCEP session without TLS next. I think you mean "The peer that initiated the connection MAY choose to re-establish ...". As written, "the peer" seems to refer to the peer that generated the PCErr, but if it was the receiving peer that generated the PCErr, you probably don't want it to attempt to re-establish the session but rather wait for the initiating peer to do so. Given the asymmetric nature of TLS for connection establishment it is relevant to identify the roles of each of the PCEP peers in it. The PCC SHALL act as TLS client, and the PCE SHALL act as TLS server, according to [RFC5246]. See comments re section 4 about terminology. I think you need to have terms for the element that is initiating the connection (either a PCC or a PCE) and the element that is receiving the connection (always a PCE). 3.3. The StartTLS Message Once the TCP connection has been successfully established and the StartTLS message sent, the sender MUST start a timer called StartTLSWait timer, after the expiration of which, if no StartTLS message has been received, it MUST send a PCErr message and releases the TCP connection with Error-Type set to [TBA2 by IANA] and Error- value set to 5 (no StartTLS message received before the expiration of the StartTLSWait timer). A RECOMMENDED value for StartTLSWait timer is 60 seconds. Really, the timer is the time to wait for *any* message to received. Open messages will cause start of upward-compatibility mechanisms (if any); any other message will be immediately rejected as an error. Indeed, isn't there already a timer which a peer uses to wait for the other peer to send a message? Isn't StartTLSWait functionally the same as OpenWait (RFC 5440 section 6.2)? ... it MUST send a PCErr message and releases ... This sentence is grammatically interesting. One part is logically "it MUST send a PCErr message". The second part might be "it MUST release the TCP connection", or "it releases the TCP connection". Strictly speaking, the rules of English grammar cause the release/releases distinction to disambiguate whether MUST applies to both parts or only to the first part. But I don't think you want to rely on that, and you want to say "... and MUST release the TCP connection ...". 3.4. TLS Connection Establishment 1. Immediately negotiate TLS sessions according to [RFC5246]. In this case, you'd say "Immediately negotiate a TLS session ...". 3.5. Peer Identity At least the following parameters of the X.509 certificate SHOULD be exposed: o Peer's IP address o Peer's fully qualified domain name (FQDN) To the naive (me), these two items seem to refer to the TCP connection that was established. But I suspect that they're intended to refer to the IP address and FQDN that might be encoded in the certificate (as in, "The following precedence applies: for DNS name validation, subjectAltName:DNS has precedence over CN; for IP address validation, subjectAltName:iPAddr has precedence over CN.") And it seems that the actual remote IP address of the TCP connection and whatever remote FQDN or IP address was used to initiate the connection should also be exposed to the administrative system. So I think there's room to expand on and clarify exactly the data items that are intended here. 4. Discovery Mechanisms A PCE can advertise its capability to support PCEPS using the IGP advertisement and discovery mechanism. If I understand this correctly, IGP is "Interior Gateway Protocol", and it's a category of protocols, not a specific protocol. And what you're saying is that a PCE can advertise using the relevant IGP's mechanism. In that case, I think you'd say "the IGP's advertisement and discovery mechanism". (Unless somehow IS-IS and OSPF are seen as variants of the same protocol, which can generically be called IGP.) A new capability flag bit for the PCE-CAP-FLAGS sub-TLV that can be announced as attribute to distribute PCEP security support information is proposed in [I-D.wu-pce-discovery-pceps-support] s/announced as attribute/announced as an attribute/. But you don't want to say "is proposed in ..." because that suggests that the proposal might not be approved, and you've already positively stated "A PCE can advertise ...". So you want to say "A new capability flag ... is defined in ..." -- and raise draft-wu-pce-discovery-pceps-support to a normative reference. Similar considerations apply to discovery via DNS (draft-wu-pce-dns-pce-discovery) -- you want to mention it here and consider it a normative reference. -- Unless you choose to make this part of the section clearly hypothetical by starting "This document does not specify any method a PCE can advertise that it supports (or requires) PCEPS, but two mechanisms have been proposed:" When DNS is used by a PCC (or a PCE acting as a client, for the rest of the section, PCC refers to both) willing to use PCEPS to locate an appropriate PCE [I-D.wu-pce-dns-pce-discovery], the PCC as an initiating entity, chooses at least one of the returned FQDNs to resolve, which it does by performing DNS "A" or "AAAA" lookups on the FDQN. s/FDQN/FQDN/ This one sentence uses the terms "acting as a client" and "as an initiating entity" to mean the same thing. You should fix on one term. And given that the same concept arises in the discussion of TLS initiation (section 3.2), you probably want to define the term for "a PCC (or a PCE acting as a client)" near the beginning as document-wide terminology. Once you've got names for the concepts of the initiating entity and the receiving entity, a number of things in the document can then be stated more clearly. If the PCC receives a response to its SRV query but it is not able to establish a PCEPS connection using the data received in the response, as initiating entity it MAY fall back to lookup a PCE that uses TCP as transport. This is unclear -- if the process of resolving the original FQDN into addresses fails to produce an address that can be contacted, how can the PCC "fall back to lookup a PCE that uses TCP as transport" -- it has already done the looking up, and that failed. I suspect you mean that the PCC is required to first attempt to contact each address using TLS, and then only if all of those attempts fail is it then permitted to fall back to using TCP. But you don't actually say that. 5. Backward Compatibility It would help if this section gave a more comprehensive discussion of how PCEPS-supporting PCEs/PCCs and non-PCEPS-supporting PCEs/PCCs can interwork, i.e., how to incrementally deploy PCEPS into an AS. The two major points seem to be (1) arranging that any two elements will communicate with the highest level of security that they both implement, and (2) any system of PCEPS-supporting and non-PCEPS-supporting elements can interwork successfully. There probably are some "interesting" management and security issues involved in this. 6.2. New Error-Values I've noted above that the function of Error-Type=TBA2/Error-Value=2 seems to duplicate that of Error-Type=1/Error-Value=1. The meaning of Error-Type=TBA2 is named "StartTLS Failure" here, but the rest of the text uses "StartTLS failure". The table given in RFC 5440 section 7.15 is not consistent about capitalization in the names of Error-Types, but most entries do not capitalize non-initial words. That suggests "StartTLS failure" should be used here. 7. Security Considerations There needs to be some consideration of interoperation of mixed PCEPS-capable and non-PCEPS-capable elements (unless such mixtures are NOT RECOMMENDED). 8.1. Control of Function and Policy A PCEP implementation SHOULD allow configuring the following PCEP security parameters: o StartTLSWait timer value PCEPS implementations MAY provide ... If I read this correctly, there is only one security parameter in this list. But since the text says "the following PCEP security parameters:", on my first reading, I assumed that "PCEPS implementation MAY provide ..." was the beginning of a second item (with the initial "o" omitted). provide ways for the operator to complete the following tasks: It looks like all of the following tasks are with regard to a selected PCEP session, though only the first task is labeled as such, whereas the 2nd through 4th are not. It seems like you want to say "to complete the following tasks in regard to any PCEP session:" and change the 1st to "Determine if the session is protected via PCEPS." 8.2. Information and Data Models The PCEP MIB module SHOULD be extended to include PCEPS capabilities, information, and status. This isn't a "SHOULD" because it isn't a constraint on implementations, it's a statement of what would be a desirable action by the IETF. -- Unless the idea is that the implementor SHOULD add a (necessarily proprietary) extension to the MIB. In any case, RFC 7420 should be referenced.) 8.4. Verify Correct Operations This section title is a verb phrase while the rest of the titles are noun phrases. Perhaps "Verification of Correct Operations". 8.5. Requirements on Other Protocols Mechanisms defined in this document do not imply any new requirements on other protocols. There is a correlated discovery mechanism: draft-wu-pce-discovery-pceps-support defines a correlated change to OSPF and IS-IS. I suppose that isn't *required* by this document, as draft-wu-pce-dns-pce-discovery or configuration might be used. But conceptually, the two discovery mechanisms are implied by this document. 10.1. Normative References It seems to me that draft-wu-pce-discovery-pceps-support and draft-wu-pce-dns-pce-discovery should be considered normative references. 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spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_HE1PR07MB09536BFE34C1E0FC24973F56E4AC0HE1PR07MB0953eurp_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Jul 2017 15:11:22.8375 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR07MB1401 Archived-At: Subject: [Pce] PCC deletion of PCE-Initiated LSP X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Jul 2017 15:11:27 -0000 --_000_HE1PR07MB09536BFE34C1E0FC24973F56E4AC0HE1PR07MB0953eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear all, draft-ietf-pce-pce-initiated-lsp discusses the behavior of the PCC when the= PCEP session to PCE times out and specifies the State Timeout after which = PCC can remove the LSPs instantiated by this PCE. However, there are situations where the PCC may want to remove LSPs initiat= ed by the PCE while the PCEP session is UP. This can be due to maintenance = operation that requires restarting of a process, other than the PCEP proces= s, on the router and which means those LSPs are deprogrammed for a period o= f time. In a case like this, it would help if PCC reports this to PCE. One way this= could be done is by sending a PCRpt message with the following Operational= bit set in the LSP object: 3 - GOING-DOWN: LSP is being torn down, resources are being released. This can be done together with the R-bit (Remove flag) set in the LSP objec= t. In other words, it is the same report sent by PCC to delete a PCC-Initia= ted LSP. PCE may decide to schedule a new PCInitiate message later on or wa= it for the operator intervention. An alternative is to define a new status flag in the PCRpt message for PCC = to inform PCE of this situation. I appreciate any thoughts into this issue. Regards, Mustapha. --_000_HE1PR07MB09536BFE34C1E0FC24973F56E4AC0HE1PR07MB0953eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear all,

draft-ietf-pce-pce-initiated-lsp discusses the behavi= or of the PCC when the PCEP session to PCE times out and specifies the Stat= e Timeout after which PCC can remove the LSPs instantiated by this PCE.

 

However, there are situations where the PCC may want = to remove LSPs initiated by the PCE while the PCEP session is UP. This can = be due to maintenance operation that requires restarting of a process, other than the PCEP process, on the router and wh= ich means those LSPs are deprogrammed for a period of time.

 

In a case like this, it would help if PCC reports thi= s to PCE. One way this could be done is by sending a PCRpt message with the= following Operational bit set in the LSP object:

 

3 - GOING-DOWN:  LSP is being torn down, = resources are being

       &nbs= p; released.

 

This can be done together with the R-bit (Remove flag= ) set in the LSP object. In other words, it is the same report sent by PCC = to delete a PCC-Initiated LSP. PCE may decide to schedule a new PCInitiate message later on or wait for the operator int= ervention.

 

An alternative is to define a new status flag in the = PCRpt message for PCC to inform PCE of this situation.

 

I appreciate any thoughts into this issue.

 

Regards,

Mustapha.

 

--_000_HE1PR07MB09536BFE34C1E0FC24973F56E4AC0HE1PR07MB0953eurp_-- From nobody Thu Jul 13 13:54:17 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 166CB129B19; Thu, 13 Jul 2017 13:54:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.522 X-Spam-Level: X-Spam-Status: No, score=-14.522 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id esZBg5qKjnoy; Thu, 13 Jul 2017 13:54:08 -0700 (PDT) Received: from alln-iport-2.cisco.com (alln-iport-2.cisco.com [173.37.142.89]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 87B421270AC; Thu, 13 Jul 2017 13:54:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=985; q=dns/txt; s=iport; t=1499979248; x=1501188848; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=RG4LI+IPIRAw3/C0tv70YkrS4hGLxUsaGMTdNmuA55E=; b=AXD7pdJEAshywbn1MJP9z97eeYG81L6WRCQtF9z0Yno4VXNpQ3JtYtNA YfD/bbqt1j6hpFehGckFdBuKEH5C9nRftQrX4K5HnNJmh4A8A5saQuzX6 s8hyIofq5D8Ua051E8qQmPa9kNvZq9DNAQxTS217LfiPaMqfAepHSVrnR U=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AAAQC43WdZ/4UNJK1cGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBg1pkgRuOApF2lgOCESyFSgKDaT8YAQIBAQEBAQEBayhCDoRIAQEBAQI?= =?us-ascii?q?BOj8FCwIBCDYQMiUBAQQBDQ2KHwgQsHyLJAEBAQEBAQEBAQEBAQEBAQEBAQEBA?= =?us-ascii?q?RgFgyiDTYFhgySKXgWfMAKHSIxBghWFTIpRlVQBHziBCnUVh1+GfYF5AYEMAQE?= =?us-ascii?q?B?= X-IronPort-AV: E=Sophos;i="5.40,355,1496102400"; d="scan'208";a="450131015" Received: from alln-core-11.cisco.com ([173.36.13.133]) by alln-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 13 Jul 2017 20:53:48 +0000 Received: from XCH-RCD-001.cisco.com (xch-rcd-001.cisco.com [173.37.102.11]) by alln-core-11.cisco.com (8.14.5/8.14.5) with ESMTP id v6DKrlRX027601 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Thu, 13 Jul 2017 20:53:48 GMT Received: from xch-rcd-001.cisco.com (173.37.102.11) by XCH-RCD-001.cisco.com (173.37.102.11) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Thu, 13 Jul 2017 15:53:47 -0500 Received: from xch-rcd-001.cisco.com ([173.37.102.11]) by XCH-RCD-001.cisco.com ([173.37.102.11]) with mapi id 15.00.1210.000; Thu, 13 Jul 2017 15:53:47 -0500 From: "Matt Hartley (mhartley)" To: "TEAS WG (teas@ietf.org)" , "ccamp@ietf.org" , "pce@ietf.org" , "mpls@ietf.org" CC: "teas-chairs@ietf.org" , "Matt Hartley (mhartley)" Thread-Topic: Slides for Joint Yang WG session in Prague Thread-Index: AdL6W+bJV9xmLUZ1SyONwk30AFcM1wBvie5A Date: Thu, 13 Jul 2017 20:53:47 +0000 Message-ID: <9bd9007c590f483c91560c09030d6123@XCH-RCD-001.cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [161.44.212.245] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [Pce] Slides for Joint Yang WG session in Prague X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Jul 2017 20:54:10 -0000 A reminder: please send slides by the end of the day tomorrow. Cheers Matt > All, >=20 > A reminder for folks presenting in the joint yang session in Prague: > please send slides by the end of Friday so that we can get them posted > well in advance. >=20 > The agenda is at https://datatracker.ietf.org/meeting/99/agenda/teas/ > (second session). >=20 > Cheers >=20 > Matt/Lou/Pavan >=20 >=20 > > All, > > > > Once again, we'll be having a joint Yang session. This time, TEAS is > > hosting, which means I get to organize the agenda. > > > > We're meeting at 13:30 - 15:30 on Thursday July 20th. Please send slot > > requests for the TEAS session to me by the end of the day on Monday, > > July 3rd (that's next week). Note that this is also the deadline for > > draft submission. > > > > We'll need slides for presentation by Friday, July 14th so that we can > > get them ready to present over the weekend. > > > > Cheers > > > > Matt/Lou/Pavan From nobody Mon Jul 17 02:27:48 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1055B12EA7C; Mon, 17 Jul 2017 02:27:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 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, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jxmyIDr8Byz5; Mon, 17 Jul 2017 02:27:45 -0700 (PDT) Received: from mail-qk0-x22d.google.com (mail-qk0-x22d.google.com [IPv6:2607:f8b0:400d:c09::22d]) (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 42C9C129468; Mon, 17 Jul 2017 02:27:42 -0700 (PDT) Received: by mail-qk0-x22d.google.com with SMTP id p73so52163356qka.2; Mon, 17 Jul 2017 02:27:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=tcUSnIO1vbm2aMIBclMoizI5ZfYcLJxwuGEzDvg1Eco=; b=Zi8yuHjYe5pcVbdVpKiXpTTrrP5sGG6PFE7D7A8OFEGZ90HRzAMrWc8Od5A1g+dvoL WEGieRBNu1ODxQ90j7HKFdg8iFUbSGQ+BSZbFJM3CKZZ/jtDgziLhPEJq0DC8FGZV36q 6MrR4xUhJINDdHv5wb63kPuAegEkd4fQTkLdNd+tVYxLrYRJZkosUaGbZP0a7g4wbQzq j1RoN8uayAXTWvus00qAWIXs19OGAS2rYUZpeXNacwfBMRMo21lb0yMo0UaNqErQCCMY qg8CoiGdrOXkXnarIUdYkihrANHrfyOcuiFSsthPdPy87jh/3k9lDnDBTQiF6jUol/3X cgPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=tcUSnIO1vbm2aMIBclMoizI5ZfYcLJxwuGEzDvg1Eco=; b=BP6Bl7+w8+yxgjnjnPGvBMyOpSI5KJjW6cEOCDBQOujJxUpCQmOBP5EfOLlT6F4ssR yjF9iKZt5MTJwUnAvyMbPC+FD5HBSxyW75fe9s6a8zgiT3DEDD6jptm4wfsMfQXhmNEM FpJoylVe3MkGokuzV2mWl/z8VHE0MuTusDzsCGBCCwVd3POXOPAEVtl77Xu8YhmlRvpM 9MYV8HaEhg1aBXS6WlqCoeSxvef+amTeHSp3cZD9v+2R/oqMTGc/WPJao8uIhxo9vJFZ YbPvXbLhWa61HJP2V/r24fMTU0+jvaDG0hbz9SnznLyqvNVBG7Z0Mpfm6XAXIwdB5pVl sAGA== X-Gm-Message-State: AIVw111+L07+zmzMc9IpRmZ9uR9PE8yY6wBMTcewOaBndgTBoO3a01c/ UQp4bKo3dzIMPQOsRuhKdPzQIoGNTXWR X-Received: by 10.55.33.194 with SMTP id f63mr24087628qki.112.1500283661175; Mon, 17 Jul 2017 02:27:41 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.51.164 with HTTP; Mon, 17 Jul 2017 02:27:40 -0700 (PDT) From: Dhruv Dhody Date: Mon, 17 Jul 2017 14:57:40 +0530 Message-ID: To: "pce@ietf.org" , pce-chairs@ietf.org Cc: draft-ietf-pce-stateful-pce-auto-bandwidth@ietf.org Content-Type: multipart/alternative; boundary="001a11400caeafd11605548002f0" Archived-At: Subject: [Pce] Status update on WG Draft X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 09:27:47 -0000 --001a11400caeafd11605548002f0 Content-Type: text/plain; charset="UTF-8" Hi WG, The following is a status update of the AUTO-BW WG document: Current Status: o Addressed outstanding review comments from Adrian (e.g., added separate down-adjustment-interval and down-adjustment-threshold parameters). o Added missing default values for parameters. o Added minimum-threshold as a suppression parameter for percentage threshold. o Various editorial changes. Open Issues: o None. Next Steps: o Authors believe the document is ready and requesting WG LC. o Welcome your review comments and suggestions. Diff: https://www.ietf.org/rfcdiff?url1=draft-ietf-pce-stateful-pce-auto-bandwidth-03&url2=draft-ietf-pce-stateful-pce-auto-bandwidth-05 Thanks, Dhruv / Rakesh --001a11400caeafd11605548002f0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi WG,
=C2=A0
The following is a status update of the AUTO-BW WG document:
=C2=A0
Curr= ent Status:
o =C2=A0 Addressed outstandin= g review comments from Adrian (e.g., added separate down-adjustment-interva= l and down-adjustment-threshold parameters).
o =C2=A0 Added missing default values for parameters.
o =C2=A0 Added minimum-threshold as a suppression parame= ter for percentage threshold.
o =C2=A0 Va= rious editorial changes.
=C2=A0
Open Issues:
o = =C2=A0 None.
=C2=A0
Next Steps:
o =C2=A0 Authors= believe the document is ready and requesting WG LC.
o =C2=A0 Welcome your review comments and suggestions.

Diff:=C2= =A0https://www.ietf.org/rfcdiff?url1=3Ddraft-ietf-pce-stateful-pce-auto-ba= ndwidth-03&url2=3Ddraft-ietf-pce-stateful-pce-auto-bandwidth-05
=
=C2=A0
Thanks,
Dhruv / Rakesh
--001a11400caeafd11605548002f0-- From nobody Tue Jul 18 08:19:54 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 513A1131686 for ; Tue, 18 Jul 2017 08:19:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rR_ZD0AHo3Uu for ; Tue, 18 Jul 2017 08:19:49 -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 8AAA9128DE5 for ; Tue, 18 Jul 2017 08:19:48 -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 v6IFJknZ025550 for ; Tue, 18 Jul 2017 16:19:46 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6IFJhb1025522 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 18 Jul 2017 16:19:45 +0100 Reply-To: From: "Adrian Farrel" To: Date: Tue, 18 Jul 2017 16:19:42 +0100 Message-ID: <06bf01d2ffd9$494bdba0$dbe392e0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AdL/2TRAy7FbyRAmRvC/dNULikyoKg== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23202.006 X-TM-AS-Result: No--23.838-10.0-31-10 X-imss-scan-details: No--23.838-10.0-31-10 X-TMASE-MatchedRID: Ox2/UrmX7l4iwqAs+LzaXwlPus/MSqC72aYdnwn7qHfagsZM0qVv167m YDa7MoGaRTLulOUYEzBE48pCXoMz9FI3mP8aC0PBHcQQBuf4ZFsgzzoB6jqxgvgnJH5vm2+gj3W VWG0MD4dCsy09psGvW+vLlgE5EvLDQyNrw2ay5cYlcqT+ugT9EFxIyn/X4SmnnKRrn2xogKgs7E Lqy7JDxolNJDgbSFZAI6Y3v9C3zJ7Mi6swfqIoFHBRIrj8R47F6Jj6zYvfFARnnK6mXN72m1fu8 Gdzd6cnubZzuzgbENpc0VoWgLAr1MTJ9OjOlxGKStpI+4+KLgAsCc2iFTIxreagZGThUgZE/qsg +OKw7BWPi/P84jAUbxYC4jP1GnU/ROmI6EeYuPuGuzokAQvW7rQ0n3DEfu2TRfmFzyKgHb6Xa1t KERfDPiewBpL5t7aRfBCuLgXPBQZZMh09pfOKJ0g5Iem1vm3HlavqJJda2A8GW3hFnC9N1YnV4F Kib7SLCZgWCmmrpkIKDYVhCsJwlAe1vNu551eNKWuiyZLRI4AsmbwU4T1YtVvo8FSqar5SCMWIH qnNY083SgLQ3k27qnqalk5QVXTVs/+w07Y/y4fBVprK8rvWX5c5WjRQ970UV0aMY26wA5xCcg19 0NG0LgLcypum82RLs8/Ux/YUxkJB3odpHWTw3JEbNXwHGDRx1Ga2L87qPQJP3ulIgoI/+W0tkyt 7B3wuZTBR+5xq2JV0HLOh+hqZdLChV1HGsZT0GLXhwJ3YV6Oe8Eev9oWczpJ5XtPVefA9arnF2G gIBf1agpy3GlCV9I34irfzSATSf/9oLiCflNieAiCmPx4NwLTrdaH1ZWqCHOI0tZ7A+B36C0ePs 7A07QKmARN5PTKc Archived-At: Subject: [Pce] Comments on draft-ietf-pce-pcep-exp-codepoints X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 Jul 2017 15:19:52 -0000 Hi, Per the chairs' request today, I had another look at the experimental codepoints draft, draft-ietf-pce-pcep-exp-codepoints-01/. Sorry to entirely rewrite your draft ;-) My meta point that I have raised before is that I think you are assigning way too many experimental code points. I do not want to be blocking on WG process on this point and will accept that I am in the rough *if* the chairs believe that that is the case. The background to my thought is BCP 82 that says: In many, if not most cases, reserving a single value for experimental use will suffice. While it may be tempting to reserve more in order to make it easy to test many things at once, reserving many may also increase the temptation for someone using a particular value to assume that a specific experimental value can be used for a given purpose exclusively. I agree that one code point is probably limiting, but I also think that * 4 messages * 8 objects * 8 TLVs would be at the high end of what is needed. The other points are below. Thanks, Adrian --- Metadata I think you are changing an existing registry definition. This is different from making an allocation from a registry, so you are updating the RFC that created the registry. You need to add the "Updates: RFC 5440" text. --- Title s/for/for the/ --- Abstract s/IETF Consensus/IETF Review/ --- Abstract OLD This document seeks to mark some codepoints for experimental usage of PCEP. NEW This document updates RFC 5440 by changing the allocation policies for these three registries to mark some of the code points as assigned for Experimental Use. END --- Requirements Language I don't think you need 2119 language in this document. See my comments on Section 5. --- 1. Introduction 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 is a somewhat old definition of PCEP that doesn't account for delegation and PCE-initiated LSPs. --- 1. Introduction In section 9 of [RFC5440], IANA assigns values to the PCEP protocol parameters (messages, objects, TLVs). IANA established a new top- level registry to contain all PCEP codepoints and sub-registries. The allocation policy for each new registry is by IETF Consensus as described in [RFC8126]. Specifically, new assignments are made via RFCs approved by the IESG. Typically, the IESG will seek input on prospective assignments from appropriate persons (e.g., a relevant Working Group if one exists). Early allocation [RFC7120] provides some latitude for allocation of these code points, but is reserved for features that are considered appropriately stable. I'm not sure you should seek to redefine "IETF Consensus". The citation of 8126 should be enough and you can cut the paragraph there. Anyway s/IETF Consensus/IETF Review/ --- 1. Introduction With some recent advancement, there is an enhanced need to experiment with PCEP. It is often necessary to use some sort of number or constant in order to actually test or experiment with the new function, even when testing in a closed environment. In order to run experiment, it is important that the value won't collide not only with existing codepoints but any future allocation. s/run experiment/run experiments/ --- 1. Introduction OLD This document thus set apart some codepoints in PCEP registry and subregistries for experimental usage. NEW This document updates [RFC5440] by changing the allocation policies for these three registries to mark some of the code points as assigned for Experimental Use. See [RFC3692] for further discussion of the use of experimental codepoints. END --- 2. PCEP Messages OLD Some codepoints are requested to be set aside for experimentation with new PCEP messages. The suggested range is 246-255. NEW PCEP message types are in the range 0 to 255. This document sets aside message types 246-255 for experimentation as described in Section 6.1. END --- 3. PCEP Objects OLD Some codepoints are requested to be set aside for experimentation with new PCEP objects. The suggested range is 224-255. NEW PCEP objects are identified by values in the range 0 to 255. This document sets aside object identifiers 224-255 for experimentation as described in Section 6.2. END --- 4. PCEP TLVs OLD Some codepoints are requested to be set aside for experimentation with new PCEP TLVs. The suggested range is 65280-65535. NEW PCEP TLV type codes are in the range 0 to 65535. This document sets aside object identifiers 65280-65535 for experimentation as described in Section 6.3. END --- OLD 5. Handling of unknown experimentation NEW 5. Handling of Unknown Experimentation END --- 5. Handling of unknown experimentation OLD A PCE that does not recognize an experimental PCEP object, MUST reject the entire PCEP message and MUST send a PCE error message with Error- Type="Unknown Object" or "Not supported object", defined as per [RFC5440]. NEW A PCE that does not recognize an experimental PCEP object, will reject the entire PCEP message and send a PCE error message with Error- Type="Unknown Object" or "Not supported object" as described in [RFC5440]. END --- 6.1. New PCEP Messages OLD Upon approval of this document, IANA is requested to make the following allocations: +---------+-------------+-------------------+ | Type | Description | Allocation Policy | +---------+-------------+-------------------+ | 246-255 | Unassigned | Experimental Use | +---------+-------------+-------------------+ NEW IANA is requested to change the registration procedure for this registry to read as follows: 0-245 IETF Review 246-255 Experimental Use IANA is also requested to mark the values 246-255 in the registry accordingly. END --- 6.2. New PCEP Objects OLD Upon approval of this document, IANA is requested to make the following allocations: +---------+-------------+-------------------+ | Type | Description | Allocation Policy | +---------+-------------+-------------------+ | 224-255 | Unassigned | Experimental Use | +---------+-------------+-------------------+ NEW IANA is requested to change the registration procedure for this registry to read as follows: 0-245 IETF Review 224-255 Experimental Use IANA is also requested to mark the values 224-255 in the registry accordingly. END --- 6.3. New PCEP TLVs OLD Upon approval of this document, IANA is requested to make the following allocations: +------------+-------------+-------------------+ | Type | Description | Allocation Policy | +------------+-------------+-------------------+ |65280-65535 | Unassigned | Experimental Use | +------------+-------------+-------------------+ NEW IANA is requested to change the registration procedure for this registry to read as follows: 0-65279 IETF Review 65280-65535 Experimental Use IANA is also requested to mark the values 65280-65535 in the registry accordingly. END --- DELETE 7. Allocation Policy The allocation policy for the IANA request in Section 6 is "Experimental". As per [RFC8126], IANA does not record specific assignments for any particular use for this policy. As the experiment/standard progress and an early IANA allocation or RFC publication happens, the IANA defined codepoints are used and experimental code points are freed up. END NOTE The meaning of the first paragraph is now achieved in Section 6. The second paragraph is ambiguous as experimental codepoints are not "freed up" in any sense that the IETF can be aware of. END --- 8. Security Considerations ADD [RFC3692] asserts that the existence of experimental code points introduce no new security considerations. However, implementations accepting experimental codepoints need to take care in how they parse and process the messages, objects, and TLVs in case they come, accidentally from another experiment. END --- 10.1. Normative References DELETE [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . END --- 10.2. Informative References Add RFC 3692 --- Appendix A. Other Codepoints Was this intended to be "Other PCEP Registries"? --- From nobody Thu Jul 20 01:28:14 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C6095127869; Thu, 20 Jul 2017 01:28:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.535 X-Spam-Level: X-Spam-Status: No, score=-3.535 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.001, SPF_SOFTFAIL=0.665] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xmNmOhft4z2e; Thu, 20 Jul 2017 01:28:11 -0700 (PDT) Received: from r-mail2.rd.orange.com (r-mail2.rd.orange.com [217.108.152.42]) by ietfa.amsl.com (Postfix) with ESMTP id DD6C0129B3A; Thu, 20 Jul 2017 01:28:07 -0700 (PDT) Received: from r-mail2.rd.orange.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 84A305D8B1E; Thu, 20 Jul 2017 10:28:06 +0200 (CEST) Received: from FTRDCH01.rd.francetelecom.fr (unknown [10.194.32.11]) by r-mail2.rd.orange.com (Postfix) with ESMTP id CDA2B5D8B16; Thu, 20 Jul 2017 10:28:04 +0200 (CEST) Received: from [10.192.150.180] (10.192.150.180) by FTRDCH01.rd.francetelecom.fr (10.194.32.11) with Microsoft SMTP Server id 14.3.319.2; Thu, 20 Jul 2017 10:28:04 +0200 From: Julien Meuric Organization: Orange To: "pce@ietf.org" , Message-ID: <4c3a734a-d04c-937b-5273-35c8f04f8179@orange.com> Date: Thu, 20 Jul 2017 10:28:04 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-US Archived-At: Subject: [Pce] My Comment on draft-lee-pce-flexible-grid X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 08:28:13 -0000 Hi, The discussion during the meeting suggests that I need to clarify my comment about draft-lee-pce-flexible-grid. This I-D is very similar to draft-ietf-pce-wson-rwa-ext, which addresses the exact same problem over a slightly different WDM label space (running a side-by-side diff between them appears to be very practical). This new I-D requests the creation of one object and 3 TLVs, which are identical to the ones created in the WSON. As a result, I believe the latter should be reused as a starting popint. Covering the flexi-grid case may just need to allocate new flag in the object header to identify the WDM type we're dealing with, and document the flexi-grid-specific assumptions (if any). Thanks, Julien From nobody Thu Jul 20 01:42:56 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2A28B129B7F; Thu, 20 Jul 2017 01:42:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.22 X-Spam-Level: X-Spam-Status: No, score=-4.22 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SIKie-aFh2wx; Thu, 20 Jul 2017 01:42:52 -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 7F9FC126B72; Thu, 20 Jul 2017 01:42:51 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml702-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DKX12488; Thu, 20 Jul 2017 08:42:50 +0000 (GMT) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml702-cah.china.huawei.com (10.201.108.43) with Microsoft SMTP Server (TLS) id 14.3.301.0; Thu, 20 Jul 2017 09:41:19 +0100 Received: from SJCEML702-CHM.china.huawei.com ([169.254.4.153]) by SJCEML703-CHM.china.huawei.com ([169.254.5.240]) with mapi id 14.03.0301.000; Thu, 20 Jul 2017 01:41:16 -0700 From: Leeyoung To: Julien Meuric , "pce@ietf.org" , "draft-lee-pce-flexible-grid@ietf.org" Thread-Topic: My Comment on draft-lee-pce-flexible-grid Thread-Index: AQHTATImRKHtrLrXmkmxgbjQhCSD76JcYrXg Date: Thu, 20 Jul 2017 08:41:15 +0000 Message-ID: <7AEB3D6833318045B4AE71C2C87E8E172B3EEB1C@SJCEML702-CHM.china.huawei.com> References: <4c3a734a-d04c-937b-5273-35c8f04f8179@orange.com> In-Reply-To: <4c3a734a-d04c-937b-5273-35c8f04f8179@orange.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.210.170.107] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.59706D0A.004E, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.153, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 038b15b562fadfae7c204aa60b66f9c5 Archived-At: Subject: Re: [Pce] My Comment on draft-lee-pce-flexible-grid X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 08:42:55 -0000 SGkgSnVsaWVuLA0KDQpJIGFncmVlLiBBIE5ldyBmbGFnIG9uIHRoZSBvYmplY3QgaGVhZGVyIChX QSBPYmplY3QsIEkgYXNzdW1lIHRoYXQgaXMgd2hhdCB5b3UgYXJlIHBvaW50aW5nIHRvKSB3aGVy ZSB3ZSBoYXZlIGEgZmxhZyB0byBpbmRpY2F0ZSBpZiB0aGlzIGlzIGZpeGVkIChXU09OKSBvciBm bGV4aS1ncmlkIGlzIHJlYXNvbmFibGUgaW5zdGVhZCBvZiBjcmVhdGluZyBhIG5ldyBvYmplY3Qg Zm9yIGEgbmV3IFNwZWN0cnVtIEFzc2lnbm1lbnQgT2JqZWN0Lg0KDQpUTFZzIHJlcXVpcmUgYSBi aXQgZGlmZmVyZW50IGVuY29kaW5nIGR1ZSB0byB0aGUgbmF0dXJlIG9mIGFkZGl0aW9uYWwgcGFy YW1ldGVycyBmb3IgZmxleGktZ3JpZC4gU28gc3RyaWN0IHJlLXVzZSBvZiBXU09OIFRMViBtYXkg bm90IGJlIHN1ZmZpY2llbnQgZm9yIHNvbWUgY2FzZXMgaW4gZmxleGktZ3JpZC4gDQoNCkJlc3Qg cmVnYXJkcywNCllvdW5nDQoNCi0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tDQpGcm9tOiBKdWxp ZW4gTWV1cmljIFttYWlsdG86anVsaWVuLm1ldXJpY0BvcmFuZ2UuY29tXSANClNlbnQ6IFRodXJz ZGF5LCBKdWx5IDIwLCAyMDE3IDEwOjI4IEFNDQpUbzogcGNlQGlldGYub3JnOyBkcmFmdC1sZWUt cGNlLWZsZXhpYmxlLWdyaWRAaWV0Zi5vcmcNClN1YmplY3Q6IE15IENvbW1lbnQgb24gZHJhZnQt bGVlLXBjZS1mbGV4aWJsZS1ncmlkDQoNCkhpLA0KDQpUaGUgZGlzY3Vzc2lvbiBkdXJpbmcgdGhl 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Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6D45C12ECCB; Thu, 20 Jul 2017 02:05:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.222 X-Spam-Level: X-Spam-Status: No, score=-4.222 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ANu5o_IFWety; Thu, 20 Jul 2017 02:05:13 -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 18972127735; Thu, 20 Jul 2017 02:05:12 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml705-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DKX16683; Thu, 20 Jul 2017 09:05:11 +0000 (GMT) Received: from DGGEML404-HUB.china.huawei.com (10.3.17.39) by lhreml705-cah.china.huawei.com (10.201.108.46) with Microsoft SMTP Server (TLS) id 14.3.301.0; Thu, 20 Jul 2017 10:04:31 +0100 Received: from DGGEML503-MBX.china.huawei.com ([169.254.9.230]) by DGGEML404-HUB.china.huawei.com ([fe80::b177:a243:7a69:5ab8%31]) with mapi id 14.03.0301.000; Thu, 20 Jul 2017 17:04:20 +0800 From: Zhenghaomian To: Leeyoung , Julien Meuric , "pce@ietf.org" , "draft-lee-pce-flexible-grid@ietf.org" Thread-Topic: My Comment on draft-lee-pce-flexible-grid Thread-Index: AQHTATIlZrAh6H0eF0iN1/0Eyg5vhaJb32SAgACIoRA= Date: Thu, 20 Jul 2017 09:04:20 +0000 Message-ID: References: <4c3a734a-d04c-937b-5273-35c8f04f8179@orange.com> <7AEB3D6833318045B4AE71C2C87E8E172B3EEB1C@SJCEML702-CHM.china.huawei.com> In-Reply-To: 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02:17:36 -0700 (PDT) From: Dhruv Dhody Date: Thu, 20 Jul 2017 14:47:36 +0530 Message-ID: To: "pce@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c0e613c32caf30554bc38e6" Archived-At: Subject: [Pce] PCE WG Minutes. X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 09:17:40 -0000 --94eb2c0e613c32caf30554bc38e6 Content-Type: text/plain; charset="UTF-8" Hi WG, The draft minutes for the PCE WG session are uploaded. https://www.ietf.org/proceedings/99/minutes/minutes-99-pce-00.txt Please reply, if there any corrections. Thanks to all, who contributed on etherpad. Thanks! Dhruv --94eb2c0e613c32caf30554bc38e6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi WG,=C2=A0

The draft= minutes for the PCE WG session are uploaded.=C2=A0

https://www.ietf.org/proceedings/99/= minutes/minutes-99-pce-00.txt

Please reply, if there any co= rrections.=C2=A0

Thanks to all, who contributed on etherpad.=C2=A0

Thanks!=C2=A0
Dhruv


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20 Jul 2017 09:35:15.6578 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0701MB1840 Archived-At: Subject: Re: [Pce] =?utf-8?b?562U5aSNOiBNeSBDb21tZW50IG9uIGRyYWZ0LWxlZS1wY2Ut?= =?utf-8?q?flexible-grid?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 09:35:22 -0000 Hi all,

the description of the available spectrum in draft-lee-pce-flexible-grid should in my opinion be consistent with the available spectrum
description in draft-ietf-ccamp-flexible-grid-ospf-ext. Please note that the available spectrum is advertised in terms of available central
frequencies!

A central frequency f_c is available only if the spectrum is available in the interval [f_c - f_minSlotWidth/2, fc + f_minSlotWidth/2]

If the flexgrid granularity is 6.25GHz and the minSlotWidth is 12.5GHz this means leads to: [f_c - 6.25GHz, f_c + 6.25 GHz]

This is different from advertising spectrum slots like for example [f_c_n-1, fc_n].

Please note that a modulated optical carrier occupies spectrum symmetrical around the central frequency.


Thanks,
Dieter


On 20.07.2017 11:04, Zhenghaomian wrote:
Hi, Julien and Young, 

I fully agree on that we should try our best on reusing the existing object/TLVs. FYI, when we are working on GMPLS extensions from fixed-grid (WSON) to flexi-grid, we have some TLVs in parallel (switching types) for fixed/flexi-grid. 

I assume this is exactly what we are doing in this draft, the split occurs when it is difficult to use existing TLV to represent the new features. In some cases, the meaning of flags/TLVs need to be changed to support different scenarios, so the similarity on object does not necessarily mean the equivalent on functionality. 

My 2 cents, 
Haomian

-----ʼԭ-----
: Pce [mailto:pce-bounces@ietf.org]  Leeyoung
ʱ: 2017720 16:41
ռ: Julien Meuric; pce@ietf.org; draft-lee-pce-flexible-grid@ietf.org
: Re: [Pce] My Comment on draft-lee-pce-flexible-grid

Hi Julien,

I agree. A New flag on the object header (WA Object, I assume that is what you are pointing to) where we have a flag to indicate if this is fixed (WSON) or flexi-grid is reasonable instead of creating a new object for a new Spectrum Assignment Object.

TLVs require a bit different encoding due to the nature of additional parameters for flexi-grid. So strict re-use of WSON TLV may not be sufficient for some cases in flexi-grid. 

Best regards,
Young

-----Original Message-----
From: Julien Meuric [mailto:julien.meuric@orange.com] 
Sent: Thursday, July 20, 2017 10:28 AM
To: pce@ietf.org; draft-lee-pce-flexible-grid@ietf.org
Subject: My Comment on draft-lee-pce-flexible-grid

Hi,

The discussion during the meeting suggests that I need to clarify my comment about draft-lee-pce-flexible-grid.

This I-D is very similar to draft-ietf-pce-wson-rwa-ext, which addresses the exact same problem over a slightly different WDM label space (running a side-by-side diff between them appears to be very practical).
This new I-D requests the creation of one object and 3 TLVs, which are identical to the ones created in the WSON.
As a result, I believe the latter should be reused as a starting popint.
Covering the flexi-grid case may just need to allocate new flag in the object header to identify the WDM type we're dealing with, and document the flexi-grid-specific assumptions (if any).

Thanks,

Julien

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Dieter Beller
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IP/Optical Networks, Optics, Nokia

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Hi Dieter,=

 = ;

I agree. I= n this draft, we refer to https://tools.ietf.org/html/draft-ietf-ccamp-flexible-grid-ospf-ext-09#sect= ion-4.1.1 for the available spectrum encoding. Is this what you are ref= erring to, or more than that?

 = ;

Thanks.

Young=

 = ;

From: Dieter Beller [mailto:Dieter.Beller@nokia.com]
Sent: Thursday, July 20, 2017 11:35 AM
To: Zhenghaomian <zhenghaomian@huawei.com>; Leeyoung <leeyo= ung@huawei.com>; Julien Meuric <julien.meuric@orange.com>; pce@iet= f.org; draft-lee-pce-flexible-grid@ietf.org
Subject: Re: [Pce] =B4=F0=B8=B4: My Comment on= draft-lee-pce-flexible-grid

 

Hi all,

the description of the available spectrum in draft-lee-pce-flexible-grid sh= ould in my opinion be consistent with the available spectrum
description in draft-ietf-ccamp-flexible-grid-ospf-ext. Please note that th= e available spectrum is advertised in terms of available central
frequencies!

A central frequency f_c is available only if the spectrum is available in t= he interval [f_c - f_minSlotWidth/2, fc + f_minSlotWidth/2]

If the flexgrid granularity is 6.25GHz and the minSlotWidth is 12.5GHz this= means leads to: [f_c - 6.25GHz, f_c + 6.25 GHz]

This is different from advertising spectrum slots like for example [f_c_n-1= , fc_n].

Please note that a modulated optical carrier occupies spectrum symmetrical = around the central frequency.


Thanks,
Dieter

On 20.07.2017 11:04, Zhenghaomian wrote:<= /p> 

Hi, Julien and Young, 
 
I fully agree on that we should try our best on reusing the existing o=
bject/TLVs. FYI, when we are working on GMPLS extensions from fixed-grid (W=
SON) to flexi-grid, we have some TLVs in parallel (switching types) for fix=
ed/flexi-grid. 
 
I assume this is exactly what we are doing in this draft, the split oc=
curs when it is difficult to use existing TLV to represent the new features=
. In some cases, the meaning of flags/TLVs need to be changed to support di=
fferent scenarios, so the similarity on object does not necessarily mean th=
e equivalent on functionality. 
 
My 2 cents, 
Haomian
 
-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: Pce [mailto:pce-bounces@ietf.org] =B4=FA=B1=ED Leeyoung
=B7=A2=CB=CD=CA=B1=BC=E4: 2017=C4=EA7=D4=C220=C8=D5 16:41
=CA=D5=BC=FE=C8=CB: Julien Meuric; pce@ietf.org; draft-lee-pce-flexible-grid@ietf.org=

=D6=F7=CC=E2: Re: [Pce] My Comment on draf=
t-lee-pce-flexible-grid
 
Hi Julien,
 
I agree. A New flag on the object header (WA Object, I assume that is =
what you are pointing to) where we have a flag to indicate if this is fixed=
 (WSON) or flexi-grid is reasonable instead of creating a new object for a =
new Spectrum Assignment Object.
 
TLVs require a bit different encoding due to the nature of additional =
parameters for flexi-grid. So strict re-use of WSON TLV may not be sufficie=
nt for some cases in flexi-grid. 
 
Best regards,
Young
 
-----Original Message-----
From: Julien Meuric [mailt=
o:julien.meuric@orange.com] 
Sent: Thursday, July 20, 2017 10:28 AM
To: pce@ietf.org; draft-lee-pce-flexible-grid@ietf.or=
g
Subject: My Comment on draft-lee-pce-flexible-grid
 
Hi,
 
The discussion during the meeting suggests that I need to clarify my c=
omment about draft-lee-pce-flexible-grid.
 
This I-D is very similar to draft-ietf-pce-wson-rwa-ext, which address=
es the exact same problem over a slightly different WDM label space (runnin=
g a side-by-side diff between them appears to be very practical).
This new I-D requests the creation of one object and 3 TLVs, which are=
 identical to the ones created in the WSON.
As a result, I believe the latter should be reused as a starting popin=
t.
Covering the flexi-grid case may just need to allocate new flag in the=
 object header to identify the WDM type we're dealing with, and document th=
e flexi-grid-specific assumptions (if any).
 
Thanks,
 
Julien
 
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--


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Open Agent & Routing Project Manager
IP/Optical Networks, Optics, Nokia

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Dieter.Beller@nokia.com

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X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0701MB1825 Archived-At: Subject: Re: [Pce] =?utf-8?b?562U5aSNOiBNeSBDb21tZW50IG9uIGRyYWZ0LWxlZS1wY2Ut?= =?utf-8?q?flexible-grid?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 10:23:31 -0000 Hi Young,

On 20.07.2017 11:41, Leeyoung wrote:

Hi Dieter,

 

I agree. In this draft, we refer to https://tools.ietf.org/html/draft-ietf-ccamp-flexible-grid-ospf-ext-09#section-4.1.1 for the available spectrum encoding. Is this what you are referring to, or more than that?


[DB>] no, I am exactly referring to draft-ietf-ccamp-flexible-grid-ospf-ext that is referenced in your pce draft.
[DB>] I just wanted to point out that you have to clearly define what a frequency slot is as it could be interpreted in
[DB>] different ways (see below).


Thanks,
Dieter


 

Thanks.

Young

 

From: Dieter Beller [mailto:Dieter.Beller@nokia.com]
Sent: Thursday, July 20, 2017 11:35 AM
To: Zhenghaomian <zhenghaomian@huawei.com>; Leeyoung <leeyoung@huawei.com>; Julien Meuric <julien.meuric@orange.com>; pce@ietf.org; draft-lee-pce-flexible-grid@ietf.org
Subject: Re: [Pce] 答复: My Comment on draft-lee-pce-flexible-grid

 

Hi all,

the description of the available spectrum in draft-lee-pce-flexible-grid should in my opinion be consistent with the available spectrum
description in draft-ietf-ccamp-flexible-grid-ospf-ext. Please note that the available spectrum is advertised in terms of available central
frequencies!

A central frequency f_c is available only if the spectrum is available in the interval [f_c - f_minSlotWidth/2, fc + f_minSlotWidth/2]

If the flexgrid granularity is 6.25GHz and the minSlotWidth is 12.5GHz this means leads to: [f_c - 6.25GHz, f_c + 6.25 GHz]

This is different from advertising spectrum slots like for example [f_c_n-1, fc_n].

Please note that a modulated optical carrier occupies spectrum symmetrical around the central frequency.


Thanks,
Dieter

On 20.07.2017 11:04, Zhenghaomian wrote:

Hi, Julien and Young, 
 
I fully agree on that we should try our best on reusing the existing object/TLVs. FYI, when we are working on GMPLS extensions from fixed-grid (WSON) to flexi-grid, we have some TLVs in parallel (switching types) for fixed/flexi-grid. 
 
I assume this is exactly what we are doing in this draft, the split occurs when it is difficult to use existing TLV to represent the new features. In some cases, the meaning of flags/TLVs need to be changed to support different scenarios, so the similarity on object does not necessarily mean the equivalent on functionality. 
 
My 2 cents, 
Haomian
 
-----邮件原件-----
发件人: Pce [mailto:pce-bounces@ietf.org] 代表 Leeyoung
发送时间: 2017年7月20日 16:41
收件人: Julien Meuric; pce@ietf.org; draft-lee-pce-flexible-grid@ietf.org
主题: Re: [Pce] My Comment on draft-lee-pce-flexible-grid
 
Hi Julien,
 
I agree. A New flag on the object header (WA Object, I assume that is what you are pointing to) where we have a flag to indicate if this is fixed (WSON) or flexi-grid is reasonable instead of creating a new object for a new Spectrum Assignment Object.
 
TLVs require a bit different encoding due to the nature of additional parameters for flexi-grid. So strict re-use of WSON TLV may not be sufficient for some cases in flexi-grid. 
 
Best regards,
Young
 
-----Original Message-----
From: Julien Meuric [mailto:julien.meuric@orange.com] 
Sent: Thursday, July 20, 2017 10:28 AM
To: pce@ietf.org; draft-lee-pce-flexible-grid@ietf.org
Subject: My Comment on draft-lee-pce-flexible-grid
 
Hi,
 
The discussion during the meeting suggests that I need to clarify my comment about draft-lee-pce-flexible-grid.
 
This I-D is very similar to draft-ietf-pce-wson-rwa-ext, which addresses the exact same problem over a slightly different WDM label space (running a side-by-side diff between them appears to be very practical).
This new I-D requests the creation of one object and 3 TLVs, which are identical to the ones created in the WSON.
As a result, I believe the latter should be reused as a starting popint.
Covering the flexi-grid case may just need to allocate new flag in the object header to identify the WDM type we're dealing with, and document the flexi-grid-specific assumptions (if any).
 
Thanks,
 
Julien
 
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ip=169.254.4.153, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 997282ccc22027411e1b9ac4d30b9037 Archived-At: Subject: Re: [Pce] =?utf-8?b?562U5aSNOiBNeSBDb21tZW50IG9uIGRyYWZ0LWxlZS1wY2Ut?= =?utf-8?q?flexible-grid?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 11:34:47 -0000 --_000_7AEB3D6833318045B4AE71C2C87E8E172B3EEC38SJCEML702CHMchi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgRGlldGVyLA0KDQpJIGdvdCBpdC4gV2Ugd2lsbCBjbGVhcmx5IHN0YXRlIHdoYXQgYSBmcmVx dWVuY3kgc2xvdCByZWFsbHkgbWVhbnMgaW4gdGhlIGRvY3VtZW50Lg0KDQpUaGFua3MNCllvdW5n DQoNCkZyb206IERpZXRlciBCZWxsZXIgW21haWx0bzpEaWV0ZXIuQmVsbGVyQG5va2lhLmNvbV0N ClNlbnQ6IFRodXJzZGF5LCBKdWx5IDIwLCAyMDE3IDEyOjIzIFBNDQpUbzogTGVleW91bmcgPGxl ZXlvdW5nQGh1YXdlaS5jb20+OyBaaGVuZ2hhb21pYW4gPHpoZW5naGFvbWlhbkBodWF3ZWkuY29t 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Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYg== Date: Thu, 20 Jul 2017 15:22:28 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=metaswitch.com; x-originating-ip: [31.133.132.64] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; BY2PR0201MB1912; 7: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 x-forefront-antispam-report: SFV:SKI; SCL:-1SFV:NSPM; SFS:(10019020)(6009001)(39850400002)(39400400002)(39410400002)(39840400002)(39450400003)(37854004)(66654002)(6116002)(72206003)(50986999)(2501003)(7736002)(6436002)(54356999)(110136004)(561944003)(25786009)(3846002)(189998001)(38730400002)(790700001)(5630700001)(102836003)(2900100001)(33656002)(14454004)(5640700003)(54896002)(6306002)(2351001)(99286003)(66066001)(86362001)(4326008)(478600001)(9686003)(8936002)(6916009)(55016002)(74316002)(53936002)(7696004)(5660300001)(81166006)(6506006)(2906002)(8676002)(77096006)(1730700003)(3660700001)(3280700002)(450100002); DIR:OUT; SFP:1102; SCL:1; SRVR:BY2PR0201MB1912; H:BY2PR0201MB1910.namprd02.prod.outlook.com; FPR:; SPF:None; MLV:ovrnspm; PTR:InfoNoRecords; LANG:en; x-ms-office365-filtering-correlation-id: 79b9d693-cc20-4d9a-d121-08d4cf832251 x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254075)(300000503095)(300135400095)(2017052603031)(201703131423075)(201703031133081)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); SRVR:BY2PR0201MB1912; x-ms-traffictypediagnostic: BY2PR0201MB1912: x-exchange-antispam-report-test: UriScan:(151999592597050)(26388249023172)(236129657087228)(788757137089)(48057245064654)(100405760836317)(148574349560750)(21748063052155)(92977632026198)(247924648384137); x-microsoft-antispam-prvs: x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(100000700101)(100105000095)(100000701101)(100105300095)(100000702101)(100105100095)(6040450)(601004)(2401047)(5005006)(8121501046)(2017060910075)(93006095)(93001095)(10201501046)(100000703101)(100105400095)(3002001)(6041248)(20161123560025)(20161123558100)(20161123562025)(20161123555025)(201703131423075)(201702281528075)(201703061421075)(201703061406153)(20161123564025)(6072148)(100000704101)(100105200095)(100000705101)(100105500095); SRVR:BY2PR0201MB1912; BCL:0; PCL:0; RULEID:(100000800101)(100110000095)(100000801101)(100110300095)(100000802101)(100110100095)(100000803101)(100110400095)(100000804101)(100110200095)(100000805101)(100110500095); SRVR:BY2PR0201MB1912; x-forefront-prvs: 0374433C81 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_BY2PR0201MB1910DD2A0B6FEB576C3D5E9484A70BY2PR0201MB1910_" MIME-Version: 1.0 X-OriginatorOrg: metaswitch.com X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Jul 2017 15:22:28.8570 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9d9e56eb-f613-4ddb-b27b-bfcdf14b2cdb X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR0201MB1912 Archived-At: Subject: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 15:22:35 -0000 --_000_BY2PR0201MB1910DD2A0B6FEB576C3D5E9484A70BY2PR0201MB1910_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon --_000_BY2PR0201MB1910DD2A0B6FEB576C3D5E9484A70BY2PR0201MB1910_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear PCE WG

 

The purpose of this email is to initiate a discussio= n about whether we want to extend PCEP to allow it to replace the functions= that are traditionally provided by the routing and signalling protocols.

 

Originally, PCEP was designed with the goal of provi= ding a distributed path computation service.  In recent years we have = extended that mission, and added path modification and path instantiation c= apabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been performed by the network manage= ment plane.

 

We are now starting to discuss proposals to add more= capabilities to PCEP – capabilities that are traditionally part of r= outing and signalling.  There were three examples of this in the PCE w= orking group meeting this week.

·        The PCECC proposal, which extends PCEP’= ;s path instantiation capability so that the PCE can provision a path end-t= o-end by touching each hop along the path.  This replaces the function= already provided by RSVP-TE.

·        The PCEP-LS proposal, which extends PCEP to = allow link state and TE information to be communicated from the network to = the PCE.  This replaces the link state flooding function provided by t= he IGPs, or BGP-LS.

·        The PCECC-SR proposal extends PCEP to allow = device-level configuration to be communicated between the network and the P= CE, such as SRGBs, prefix SIDs etc.  Again, this replaces functions th= at are already designed into the IGPs.

 

These proposals are taking PCEP in the direction of = being a fully-fledged SDN protocol.  With these proposals, one can env= ision a network in which there is no traditional control plane.  PCEP = is used to communicate the current network state and to program flows.  These proposals have their roots in the ACTN a= nd PCECC architectures that are adopted within the TEAS working group. = ; TEAS is very much assuming that this is the direction that we want to tak= e PCEP in.  However, there are two procedural issues, as I see it.

1.      We have not had an explicit discussion in the PCE W= G about whether we want to take PCEP in this direction.  We have had a= few lively debates on specific cases, like PCEP-LS, but those cases repres= ent the “thin end of the wedge”.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.      We do not currently have a charter that allows us t= o add this type of capability to PCEP.  Depending on the outcome of di= scussion (1), we can of course extend the charter.

 

This email is to initiate the discussion (1).  = So, please reply to the mailing list and share your thoughts on whether PCE= P should be extended in this direction, and how far we should go.

 

I am hoping to get more than just “yes” = or “no” answers to this question (although that would be better= than no answer).  I would like to hear justifications for or against.=   Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirable to solve the pr= oblems in those networks with the traditional control plane?  What har= m could this do?  What would be the operational problems associated wi= th adding these functions to PCEP?

 

Many thanks

Jon

 

--_000_BY2PR0201MB1910DD2A0B6FEB576C3D5E9484A70BY2PR0201MB1910_-- From nobody Thu Jul 20 09:47:01 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 17035131714 for ; Thu, 20 Jul 2017 09:47:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.889 X-Spam-Level: X-Spam-Status: No, score=-1.889 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, T_SPF_PERMERROR=0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mA7jcraKlKX5 for ; Thu, 20 Jul 2017 09:46:57 -0700 (PDT) Received: from cica-lavadora-l1mail2.puc.rediris.es (ci-l1mail2-out05a.puc.rediris.es [IPv6:2001:720:418:ca02::23]) (using TLSv1.2 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 26A62131C4E for ; Thu, 20 Jul 2017 09:46:56 -0700 (PDT) X-IPAS-Result: =?us-ascii?q?A+DRAgDw3XBZjLBAASCH4YnAINCAz3+P8oj2FFwdAQUBCwG?= =?us-ascii?q?CbyKBLaEGmBYohR8Cg3VXAQIBAQEBAQITAQEBJleFGQECAy1BGwsNCy5XEwgBA?= =?us-ascii?q?YosAwELtFAiAgOKegEKAQEBJIMogTGCHIFgASuCeYQ7EgGGEAWfPoImkXSCDIV?= =?us-ascii?q?Qg1UXhmyMf4hfVoEAC1KBAYUTEAyBaYg9gjEBAQE?= X-IronPort-AV: E=Sophos;i="5.40,384,1496095200"; d="scan'208,217";a="100883906" Received: from unknown (HELO leo.cttc.es) ([IPv6:2001:40b0:7c22:6020:a00:27ff:fe42:3b14]) by smtpout.puc.rediris.es with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Jul 2017 18:46:54 +0200 Received: from [84.88.61.50] (unknown [84.88.61.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by leo.cttc.es (Postfix) with ESMTPSA id 6137C1FC40 for ; Thu, 20 Jul 2017 18:46:53 +0200 (CEST) To: pce@ietf.org References: From: Ramon Casellas Message-ID: <8f97e560-1ce5-49c4-8733-aafcc0668534@cttc.es> Date: Thu, 20 Jul 2017 18:46:52 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Thunderbird/55.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------5ADFD83C307128120BA7441B" Content-Language: en-US Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 16:47:00 -0000 This is a multi-part message in MIME format. --------------5ADFD83C307128120BA7441B Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit On 7/20/2017 5:22 PM, Jonathan Hardwick wrote: > > 1.We have not had an explicit discussion in the PCE WG about whether > we want to take PCEP in this direction. We have had a few lively > debates on specific cases, like PCEP-LS, but those cases represent the > thin end of the wedge. If we start down this path then we are > accepting that PCEP will replace the functions available in the > traditional control plane. We need to test whether there is a > consensus in the working group to move in that direction. > > > This email is to initiate the discussion (1). So, please reply to the > mailing list and share your thoughts on whether PCEP should be > extended in this direction, and how far we should go. > Hi all, Just my two cents, trying not to elaborate too much. In short, my answer is yes. The main disclaimer is that it is a view from a research/experimental perspective. I am aware of the functional implications, separation of concerns, functions, etc. and in previous meetings we have had several (heated :) discussions on this. We have a (proprietary) implementation which, in the last years, has morphed/grown into the likes of an SDN controller e.g., an optical SDN controller for fixed and flexi-grid networks. It can be deployed directly over a GMPLS control plane or in PCECC mode. We have running implementations of PCEP-LS, PCE-CC and an ACTN proof-of-concept for multi-domain flexi-grid networks (base on active, stateful, hierarchical PCE). The main driver/motivation has been convenience, in a clearly evolutionary approach (adding two wheels and an engine to the bicycle to make it a car). We have been influenced by SDN/Centralized control concepts. In most cases we needed to implement a message exchange and PCEP (beyond its original intent) provided such length-delimited reliable message exchange between entities. We have implemented BGP-LS but I see no reason why PCEP cannot be extended for the same (PCEP-LS) being almost functionally equivalent. We also had a modified OpenFlow for optical networks as SBI, (pre-ONF work adapting CFLOW_MOD) but PCE-CC also allows us to program roughly the same equivalent cross-connects. Having a single unified framework (PCEP) is very useful for robustness, avoid code duplication, etc., along with unified session management, parsers, tests, etc. IMHO, with the stateful PCE work we already went beyond the basic path computation service. Best regards Ramon -- Ramon Casellas, Ph.D. -- Senior Researcher -- Networks Division Optical Networks and Systems Department -- http://www.cttc.es/people/rcasellas/ CTTC - Centre Tecnolgic de Telecomunicacions de Catalunya Parc Mediterrani de la Tecnologia (PMT) - Edifici B4 Av. Carl Friedrich Gauss, 7 - 08860 Castelldefels (Barcelona) - Spain Tel.: +34 93 645 29 00 ext 2168 -- Fax. +34 93 645 29 01 --------------5ADFD83C307128120BA7441B Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit
On 7/20/2017 5:22 PM, Jonathan Hardwick wrote:

1. We have not had an explicit discussion in the PCE WG about whether we want to take PCEP in this direction. We have had a few lively debates on specific cases, like PCEP-LS, but those cases represent the thin end of the wedge. If we start down this path then we are accepting that PCEP will replace the functions available in the traditional control plane. We need to test whether there is a consensus in the working group to move in that direction.


This email is to initiate the discussion (1). So, please reply to the mailing list and share your thoughts on whether PCEP should be extended in this direction, and how far we should go.


Hi all,

Just my two cents, trying not to elaborate too much. In short, my answer is yes.

The main disclaimer is that it is a view from a research/experimental perspective. I am aware of the functional implications, separation of concerns, functions, etc. and in previous meetings we have had several (heated :) discussions on this.

We have a (proprietary) implementation which, in the last years, has morphed/grown into the likes of an SDN controller e.g., an optical SDN controller for fixed and flexi-grid networks. It can be deployed directly over a GMPLS control plane or in PCECC mode. We have running implementations of PCEP-LS, PCE-CC and an ACTN proof-of-concept for multi-domain flexi-grid networks (base on active, stateful, hierarchical PCE).

The main driver/motivation has been convenience, in a clearly evolutionary approach (adding two wheels and an engine to the bicycle to make it a car). We have been influenced by SDN/Centralized control concepts. In most cases we needed to implement a message exchange and PCEP (beyond its original intent) provided such length-delimited reliable message exchange between entities. We have implemented BGP-LS but I see no reason why PCEP cannot be extended for the same (PCEP-LS) being almost functionally equivalent. We also had a modified OpenFlow for optical networks as SBI, (pre-ONF work adapting CFLOW_MOD) but PCE-CC also allows us to program roughly the same equivalent cross-connects. Having a single unified framework (PCEP) is very useful for robustness, avoid code duplication, etc., along with unified session management, parsers, tests, etc.

IMHO, with the stateful PCE work we already went beyond the basic path computation service.

Best regards
Ramon

-- 
Ramon Casellas, Ph.D. -- Senior Researcher -- Networks Division
Optical Networks and Systems Department -- http://www.cttc.es/people/rcasellas/
CTTC - Centre Tecnolgic de Telecomunicacions de Catalunya
Parc Mediterrani de la Tecnologia (PMT) - Edifici B4
Av. Carl Friedrich Gauss, 7 - 08860 Castelldefels (Barcelona) - Spain
Tel.: +34 93 645 29 00 ext 2168 -- Fax. +34 93 645 29 01
--------------5ADFD83C307128120BA7441B-- From nobody Thu Jul 20 12:58:22 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 60510131B97 for ; Thu, 20 Jul 2017 12:58:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.609 X-Spam-Level: X-Spam-Status: No, score=-2.609 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, T_KAM_HTML_FONT_INVALID=0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FvgnvM8_G8Oj for ; Thu, 20 Jul 2017 12:58:18 -0700 (PDT) Received: from asmtp1.iomartmail.com (asmtp1.iomartmail.com [62.128.201.248]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E7845129B35 for ; Thu, 20 Jul 2017 12:58:17 -0700 (PDT) Received: from asmtp1.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp1.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6KJwA0M003085; Thu, 20 Jul 2017 20:58:12 +0100 Received: from 950129200 (dhcp-9c90.meeting.ietf.org [31.133.156.144]) (authenticated bits=0) by asmtp1.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6KJw6dq003059 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 20 Jul 2017 20:58:08 +0100 Reply-To: From: "Adrian Farrel" To: "'Ramon Casellas'" , References: <8f97e560-1ce5-49c4-8733-aafcc0668534@cttc.es> In-Reply-To: <8f97e560-1ce5-49c4-8733-aafcc0668534@cttc.es> Date: Thu, 20 Jul 2017 20:58:04 +0100 Message-ID: <0d0001d30192$81be1f10$853a5d30$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0D01_01D3019A.E384F810" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGzo1ScqRzafdGA5mNKS+4SVV00EQKIqVt8ooeWi5A= Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23208.001 X-TM-AS-Result: No--20.224-10.0-31-10 X-imss-scan-details: No--20.224-10.0-31-10 X-TMASE-MatchedRID: pS5owHKhBO04HKI/yaqRm1u4M/xm4KZeHuyr/IhKGXVrH7R0RhorDJD0 R82HKGI9SMGrDR9Tb3sCxhNfkT/KQPWzx4I556Jgq32frrMnhEiC7C2rJeUToaizNBq55glQTeN +hGHqlTW1keW8YU9F8ZUGG00K6CRIMkaIaLbJ6ue9HTxRE6QQBxNzcbBs7azLHFSQk97VYGrxy7 sk25bcU/gueoOFGu3pvbs1haQKh9D51WNA1rE6tya1MaKuob8PH181YDtIVaprgxolpOSm/Vk/E VZFlSoupqtkNNLFvCnQvEuTNHaCJh3ZJC2sAO0hNJlyngnIQcE/QS4H3CQy6tqCxkzSpW/XsGpi ahJS74bizzVp6pqhf1aVc4rXqACF+g3TEidc8f/Or8/a/TSIo8QYGgcp3dr5LVsot2GWhEk+QV5 qK4KKvYWgZkkUCQHmlEdSAZma1uLaVScbiljcbG3NvezwBrVmh8Ytn75ClDNEv26FkhjLXWNoke yvFnLMHhgMFd/39H2UZOfv1YM0aPvFu/Jhk0072MZGQuKc8UhAJ/ashI7fO8lgi/vLS272sSGER dTCBFv8VJmtMEgxx9/40PVd3toESg2ZSwUn/KtCvapcIkxJX3LhUU/qa4OGNuUvDTjm0mb/V94M Qqfo/ReXYs522K77PEdDuufVI0425XOhnouJ5XBRIrj8R47FtF9GMNu1bqLkOOZ1bT6psa7BVPF MOQQusrZgdv+SJ0/88SAvS2rKrnRue7aQeqLEsyw+ZJnFumQTskidPjB12hON+Q7elv5YPSawiB LK6fcf9nvUckM1oVpzKEH0vVqvEnerDpp3+WOeAiCmPx4NwGmRqNBHmBvenFK7VE/xL0lFGCd0S 0NCsq5dgaFJ1dMHwDf2sbcgt8B7ljt96gGjQYKjRfK8hQlLCStjCuOR/hg= Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 19:58:21 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0D01_01D3019A.E384F810 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, =20 Ramon's last line for me is the core of the argument. =20 > IMHO, with the stateful PCE work we already went beyond the basic > path computation service. =20 You might recall (if you are old and carry a grudge) that I was not an enthusiast for stateful active PCE (i.e., PCInitiate), but like the good = soldier I am, I bowed to IETF consensus and PCE is what it is. More importantly, = PCEP is what it is. =20 IM(not-very)HO we have already crossed the line and PCEP *is* an SDN = controller (southbound) protocol. =20 Now the question is: what do we want to be able to do with it? =20 Obviously, as editor of draft-ietf-teas-pce-central-control, I support = PCE-CC. As discussed in the meeting, I'm not so happy with the mechanisms in the = current solutions drafts. This is because I believe we can actually do (or = almost do) most of the function with existing messages and objects. But that is a = question of detail, not principle. =20 I would argue that this PCE-CC function doesn't "replace" RSVP-TE, but = rather it replaces other configuration or SDN southbound protocols.=20 =20 Cheers, Adrian =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Ramon Casellas Sent: 20 July 2017 17:47 To: pce@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 On 7/20/2017 5:22 PM, Jonathan Hardwick wrote: 1. We have not had an explicit discussion in the PCE WG about = whether we want to take PCEP in this direction. We have had a few lively debates = on specific cases, like PCEP-LS, but those cases represent the =93thin end = of the wedge=94. If we start down this path then we are accepting that PCEP = will replace the functions available in the traditional control plane. We need to = test whether there is a consensus in the working group to move in that = direction. This email is to initiate the discussion (1). So, please reply to the = mailing list and share your thoughts on whether PCEP should be extended in this direction, and how far we should go. Hi all, Just my two cents, trying not to elaborate too much. In short, my answer = is yes. The main disclaimer is that it is a view from a research/experimental perspective. I am aware of the functional implications, separation of = concerns, functions, etc. and in previous meetings we have had several (heated :) discussions on this. We have a (proprietary) implementation which, in the last years, has morphed/grown into the likes of an SDN controller e.g., an optical SDN controller for fixed and flexi-grid networks. It can be deployed = directly over a GMPLS control plane or in PCECC mode. We have running implementations = of PCEP-LS, PCE-CC and an ACTN proof-of-concept for multi-domain flexi-grid networks (base on active, stateful, hierarchical PCE). The main driver/motivation has been convenience, in a clearly = evolutionary approach (adding two wheels and an engine to the bicycle to make it a = car). We have been influenced by SDN/Centralized control concepts. In most cases = we needed to implement a message exchange and PCEP (beyond its original = intent) provided such length-delimited reliable message exchange between = entities. We have implemented BGP-LS but I see no reason why PCEP cannot be extended = for the same (PCEP-LS) being almost functionally equivalent. We also had a = modified OpenFlow for optical networks as SBI, (pre-ONF work adapting CFLOW_MOD) = but PCE-CC also allows us to program roughly the same equivalent = cross-connects. Having a single unified framework (PCEP) is very useful for robustness, = avoid code duplication, etc., along with unified session management, parsers, = tests, etc. =20 IMHO, with the stateful PCE work we already went beyond the basic path computation service. Best regards Ramon --=20 Ramon Casellas, Ph.D. -- Senior Researcher -- Networks Division Optical Networks and Systems Department -- = http://www.cttc.es/people/rcasellas/ CTTC - Centre Tecnol=F2gic de Telecomunicacions de Catalunya Parc Mediterrani de la Tecnologia (PMT) - Edifici B4 Av. Carl Friedrich Gauss, 7 - 08860 Castelldefels (Barcelona) - Spain Tel.: +34 93 645 29 00 ext 2168 -- Fax. +34 93 645 29 01=20 ------=_NextPart_000_0D01_01D3019A.E384F810 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,

 

Ramon's last line for = me is the core of the argument.

 

> IMHO, with the = stateful PCE work we already went beyond the = basic

> path computation = service.

 

You might recall (if = you are old and carry a grudge) that I was not an enthusiast for = stateful active PCE (i.e., PCInitiate), but like the good soldier I am, = I bowed to IETF consensus and PCE is what it is. More importantly, PCEP = is what it is.

 

IM(not-very)HO we have = already crossed the line and PCEP *is* an SDN controller (southbound) = protocol.

 

Now the question is: = what do we want to be able to do with it?

 

Obviously, as editor = of draft-ietf-teas-pce-central-control, I support PCE-CC. As discussed = in the meeting, I'm not so happy with the mechanisms in the current = solutions drafts. This is because I believe we can actually do (or = almost do) most of the function with existing messages and objects. But = that is a question of detail, not principle.

 

I would argue that = this PCE-CC function doesn't "replace" RSVP-TE, but rather it = replaces other configuration or SDN southbound protocols. =

 

Cheers,

Adrian

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Ramon = Casellas
Sent: 20 July 2017 17:47
To: = pce@ietf.org
Subject: Re: [Pce] PCEP as an SDN controller = protocol?

 

On 7/20/2017 5:22 = PM, Jonathan Hardwick wrote:

1.      We have not had an = explicit discussion in the PCE WG about whether we want to take PCEP in = this direction.  We have had a few lively debates on specific = cases, like PCEP-LS, but those cases represent the “thin end of = the wedge”.  If we start down this path then we are accepting = that PCEP will replace the functions available in the traditional = control plane.  We need to test whether there is a consensus in the = working group to move in that direction.



This email is to initiate the discussion (1).  = So, please reply to the mailing list and share your thoughts on whether = PCEP should be extended in this direction, and how far we should = go.


Hi all,

Just my two cents, = trying not to elaborate too much. In short, my answer is yes.

The = main disclaimer is that it is a view from a research/experimental = perspective. I am aware of the functional implications, separation of = concerns, functions, etc. and in previous meetings we have had several = (heated  :) discussions on this.

We have a (proprietary) = implementation which, in the last years, has morphed/grown into the = likes of an SDN controller e.g., an optical SDN controller for fixed and = flexi-grid networks.  It can be deployed directly over a GMPLS = control plane or in PCECC mode. We have running implementations of = PCEP-LS, PCE-CC and an ACTN proof-of-concept for multi-domain flexi-grid = networks (base on active, stateful, hierarchical PCE).

The main = driver/motivation has been convenience, in a clearly evolutionary = approach (adding two wheels and an engine to the bicycle to make it a = car). We have been influenced by SDN/Centralized control concepts. In = most cases we needed to implement a message exchange and PCEP (beyond = its original intent) provided such length-delimited reliable message = exchange between entities. We have implemented BGP-LS but I see no = reason why PCEP cannot be extended for the same (PCEP-LS) being almost = functionally equivalent. We also had a modified OpenFlow for optical = networks as SBI, (pre-ONF work adapting CFLOW_MOD) but PCE-CC also = allows us to program roughly the same equivalent cross-connects. Having = a single unified framework (PCEP) is very useful for robustness, avoid = code duplication, etc., along with unified session management, parsers, = tests, etc.
 
IMHO, with the stateful PCE work we already = went beyond the basic path computation service.

Best = regards
Ramon


-- 
Ramon Casellas, Ph.D. -- Senior =
Researcher -- Networks Division
Optical Networks =
and Systems Department -- http://www.cttc.es/people/r=
casellas/
CTTC - Centre Tecnol=F2gic de =
Telecomunicacions de Catalunya
Parc Mediterrani de =
la Tecnologia (PMT) - Edifici B4
Av. Carl Friedrich =
Gauss, 7 - 08860 Castelldefels (Barcelona) - =
Spain
Tel.: +34 93 645 29 00 ext 2168 -- Fax. +34 =
93 645 29 01
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Lopez" To: "pce@ietf.org" Thread-Topic: [Pce] PCEP as an SDN controller protocol? 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X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 22:07:49 -0000 --_000_5D805A6E0D414529B54D42244FCC7F99telefonicacom_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi, Having arrived to the PCEverse later than most of you, I must say my impres= sion is exactly the same. I remember asking my colleagues who were already = involved why we were not using the term SDN when it became common and, in f= act, referencing our PCE implementation in the list of our SDN projects. As Adrian says, the question is what do we want to be able to do with this = "recently discovered=94 SDN protocol... Be goode, On 20 Jul 2017, at 21:58 , Adrian Farrel > wrote: Hi, Ramon's last line for me is the core of the argument. > IMHO, with the stateful PCE work we already went beyond the basic > path computation service. You might recall (if you are old and carry a grudge) that I was not an enth= usiast for stateful active PCE (i.e., PCInitiate), but like the good soldie= r I am, I bowed to IETF consensus and PCE is what it is. More importantly, = PCEP is what it is. IM(not-very)HO we have already crossed the line and PCEP *is* an SDN contro= ller (southbound) protocol. Now the question is: what do we want to be able to do with it? Obviously, as editor of draft-ietf-teas-pce-central-control, I support PCE-= CC. As discussed in the meeting, I'm not so happy with the mechanisms in th= e current solutions drafts. This is because I believe we can actually do (o= r almost do) most of the function with existing messages and objects. But t= hat is a question of detail, not principle. I would argue that this PCE-CC function doesn't "replace" RSVP-TE, but rath= er it replaces other configuration or SDN southbound protocols. Cheers, Adrian From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Ramon Casellas Sent: 20 July 2017 17:47 To: pce@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? On 7/20/2017 5:22 PM, Jonathan Hardwick wrote: 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the =93thin end o= f the wedge=94. If we start down this path then we are accepting that PCEP= will replace the functions available in the traditional control plane. We= need to test whether there is a consensus in the working group to move in = that direction. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. Hi all, Just my two cents, trying not to elaborate too much. In short, my answer is= yes. The main disclaimer is that it is a view from a research/experimental persp= ective. I am aware of the functional implications, separation of concerns, = functions, etc. and in previous meetings we have had several (heated :) di= scussions on this. We have a (proprietary) implementation which, in the last years, has morphe= d/grown into the likes of an SDN controller e.g., an optical SDN controller= for fixed and flexi-grid networks. It can be deployed directly over a GMP= LS control plane or in PCECC mode. We have running implementations of PCEP-= LS, PCE-CC and an ACTN proof-of-concept for multi-domain flexi-grid network= s (base on active, stateful, hierarchical PCE). The main driver/motivation has been convenience, in a clearly evolutionary = approach (adding two wheels and an engine to the bicycle to make it a car).= We have been influenced by SDN/Centralized control concepts. In most cases= we needed to implement a message exchange and PCEP (beyond its original in= tent) provided such length-delimited reliable message exchange between enti= ties. We have implemented BGP-LS but I see no reason why PCEP cannot be ext= ended for the same (PCEP-LS) being almost functionally equivalent. We also = had a modified OpenFlow for optical networks as SBI, (pre-ONF work adapting= CFLOW_MOD) but PCE-CC also allows us to program roughly the same equivalen= t cross-connects. Having a single unified framework (PCEP) is very useful f= or robustness, avoid code duplication, etc., along with unified session man= agement, parsers, tests, etc. IMHO, with the stateful PCE work we already went beyond the basic path comp= utation service. Best regards Ramon -- Ramon Casellas, Ph.D. -- Senior Researcher -- Networks Division Optical Networks and Systems Department -- http://www.cttc.es/people/rcasel= las/ CTTC - Centre Tecnol=F2gic de Telecomunicacions de Catalunya Parc Mediterrani de la Tecnologia (PMT) - Edifici B4 Av. Carl Friedrich Gauss, 7 - 08860 Castelldefels (Barcelona) - Spain Tel.: +34 93 645 29 00 ext 2168 -- Fax. +34 93 645 29 01 _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce -- "Esta vez no fallaremos, Doctor Infierno" Dr Diego R. Lopez Telefonica I+D http://people.tid.es/diego.lopez/ e-mail: diego.r.lopez@telefonica.com Tel: +34 913 129 041 Mobile: +34 682 051 091 ---------------------------------- ________________________________ Este mensaje y sus adjuntos se dirigen exclusivamente a su destinatario, pu= ede contener informaci=F3n privilegiada o confidencial y es para uso exclus= ivo de la persona o entidad de destino. Si no es usted. el destinatario ind= icado, queda notificado de que la lectura, utilizaci=F3n, divulgaci=F3n y/o= copia sin autorizaci=F3n puede estar prohibida en virtud de la legislaci= =F3n vigente. Si ha recibido este mensaje por error, le rogamos que nos lo = comunique inmediatamente por esta misma v=EDa y proceda a su destrucci=F3n. The information contained in this transmission is privileged and confidenti= al information intended only for the use of the individual or entity named = above. If the reader of this message is not the intended recipient, you are= hereby notified that any dissemination, distribution or copying of this co= mmunication is strictly prohibited. If you have received this transmission = in error, do not read it. Please immediately reply to the sender that you h= ave received this communication in error and then delete it. Esta mensagem e seus anexos se dirigem exclusivamente ao seu destinat=E1rio= , pode conter informa=E7=E3o privilegiada ou confidencial e =E9 para uso ex= clusivo da pessoa ou entidade de destino. Se n=E3o =E9 vossa senhoria o des= tinat=E1rio indicado, fica notificado de que a leitura, utiliza=E7=E3o, div= ulga=E7=E3o e/ou c=F3pia sem autoriza=E7=E3o pode estar proibida em virtude= da legisla=E7=E3o vigente. Se recebeu esta mensagem por erro, rogamos-lhe = que nos o comunique imediatamente por esta mesma via e proceda a sua destru= i=E7=E3o --_000_5D805A6E0D414529B54D42244FCC7F99telefonicacom_ Content-Type: text/html; charset="Windows-1252" Content-ID: <538212977967BA4FA6C8C2140E305198@eurprd06.prod.outlook.com> Content-Transfer-Encoding: quoted-printable Hi,

Having arrived to the PCEverse later than most of you, I mu= st say my impression is exactly the same. I remember asking my colleagues w= ho were already involved why we were not using the term SDN when it became = common and, in fact, referencing our PCE implementation in the list of our SDN projects.

As Adrian says, the question is what do we want to be able = to do with this "recently discovered=94 SDN protocol...

Be goode,

On 20 Jul 2017, at 21:58 , Adrian Farrel <adrian@olddog.co.uk> wrote:
Hi,
 
Ramon's last line for m= e is the core of the argument.
 
> IMHO, with the sta= teful PCE work we already went beyond the basic
> path computation s= ervice.
 
You might recall (if yo= u are old and carry a grudge) that I was not an enthusiast for stateful act= ive PCE (i.e., PCInitiate), but like the good soldier I am, I bowed to IETF= consensus and PCE is what it is. More importantly, PCEP is what it is.
 
IM(not-very)HO we have = already crossed the line and PCEP *is* an SDN controller (southbound) proto= col.
 
Now the question is: wh= at do we want to be able to do with it?
 
Obviously, as editor of= draft-ietf-teas-pce-central-control, I support PCE-CC. As discussed in the= meeting, I'm not so happy with the mechanisms in the current solutions dra= fts. This is because I believe we can actually do (or almost do) most of the function with existing messages and= objects. But that is a question of detail, not principle.<= /o:p>
 
I would argue that this= PCE-CC function doesn't "replace" RSVP-TE, but rather it replace= s other configuration or SDN southbound protocols. 
 
Cheers,=
Adrian<= /o:p>
 
From: Pce [mailto:pce-bounces@ietf.org]<= span class=3D"Apple-converted-space"> On Behalf O= f Ramon Casellas
Sent: 2= 0 July 2017 17:47
To: pce@ietf.org
Subject: Re: [Pce] PCEP as an SDN controller protocol?
 
On 7/20/2017 5:22 PM, Jonathan Hardwick wrote:
1.      We have not had an explicit discussion in the PCE WG = about whether we want to take PCEP in this direction.  We have had a few lively debates on specific cases, like PCEP-LS, but those cases repres= ent the =93thin end of the wedge=94.  If we start down this path then = we are accepting that PCEP will replace the functions available in the trad= itional control plane.  We need to test whether there is a consensus in the working group to move in that direction.


This email is to initiate the discussion (1).  So, please reply to the= mailing list and share your thoughts on whether PCEP should be extended in= this direction, and how far we should go.

Hi all,

Just my two cents, trying not to elaborate too much. In short, my answer is= yes.

The main disclaimer is that it is a view from a research/experimental persp= ective. I am aware of the functional implications, separation of concerns, = functions, etc. and in previous meetings we have had several (heated  = :) discussions on this.

We have a (proprietary) implementation which, in the last years, has morphe= d/grown into the likes of an SDN controller e.g., an optical SDN controller= for fixed and flexi-grid networks.  It can be deployed directly over = a GMPLS control plane or in PCECC mode. We have running implementations of PCEP-LS, PCE-CC and an ACTN proof-of-co= ncept for multi-domain flexi-grid networks (base on active, stateful, hiera= rchical PCE).

The main driver/motivation has been convenience, in a clearly evolutionary = approach (adding two wheels and an engine to the bicycle to make it a car).= We have been influenced by SDN/Centralized control concepts. In most cases= we needed to implement a message exchange and PCEP (beyond its original intent) provided such length-delimi= ted reliable message exchange between entities. We have implemented BGP-LS = but I see no reason why PCEP cannot be extended for the same (PCEP-LS) bein= g almost functionally equivalent. We also had a modified OpenFlow for optical networks as SBI, (pre-ONF work= adapting CFLOW_MOD) but PCE-CC also allows us to program roughly the same = equivalent cross-connects. Having a single unified framework (PCEP) is very= useful for robustness, avoid code duplication, etc., along with unified session management, parsers, tests, = etc.
 
IMHO, with the stateful PCE work we already went beyond the basic path comp= utation service.

Best regards
Ramon


-- 
Ramon Casellas, Ph.D. -- Senior Researcher -- Network=
s Division
Optical Networks and Systems Department -- http://www.cttc.es/people/rcasellas/=

CTTC - Centre Tecnol=F2gic de Telecomunicacions de Ca=
talunya
Parc Mediterrani de la Tecnologia (PMT) - Edifici B4<=
o:p class=3D"">
Av. Carl Friedrich Gauss, 7 - 08860 Castelldefels (Ba=
rcelona) - Spain
Tel.: +34 93 645 29 00 ext 2168 -- Fax. +34 9=
3 645 29 01
________________________________= _______________
Pce mailing list
Pce@ietf.org
https://www.ietf.org/mailman/listinfo/pce<= br style=3D"font-family: LucidaGrande; font-size: 11px; font-style: normal;= font-variant: normal; font-weight: normal; letter-spacing: normal; line-he= ight: normal; orphans: auto; text-align: start; text-indent: 0px; text-tran= sform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-= text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=3D"">

--
"Esta vez no fallaremos, Doctor Infierno"

Dr Diego R. Lopez
Telefonica I+D
http://people.tid.= es/diego.lopez/

e-mail: diego.r.lopez@telefonica.com
Tel:    +34 913 129 041
Mobile: +34 682 051 091
----------------------------------



Este mensaje y sus adjuntos se dirigen exclusivamente a su destinatario, pu= ede contener informaci=F3n privilegiada o confidencial y es para uso exclus= ivo de la persona o entidad de destino. Si no es usted. el destinatario ind= icado, queda notificado de que la lectura, utilizaci=F3n, divulgaci=F3n y/o copia sin autorizaci=F3n puede e= star prohibida en virtud de la legislaci=F3n vigente. Si ha recibido este m= ensaje por error, le rogamos que nos lo comunique inmediatamente por esta m= isma v=EDa y proceda a su destrucci=F3n.

The information contained in this transmission is privileged and confidenti= al information intended only for the use of the individual or entity named = above. If the reader of this message is not the intended recipient, you are= hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If y= ou have received this transmission in error, do not read it. Please immedia= tely reply to the sender that you have received this communication in error= and then delete it.

Esta mensagem e seus anexos se dirigem exclusivamente ao seu destinat=E1rio= , pode conter informa=E7=E3o privilegiada ou confidencial e =E9 para uso ex= clusivo da pessoa ou entidade de destino. Se n=E3o =E9 vossa senhoria o des= tinat=E1rio indicado, fica notificado de que a leitura, utiliza=E7=E3o, divulga=E7=E3o e/ou c=F3pia sem autoriza=E7=E3o p= ode estar proibida em virtude da legisla=E7=E3o vigente. Se recebeu esta me= nsagem por erro, rogamos-lhe que nos o comunique imediatamente por esta mes= ma via e proceda a sua destrui=E7=E3o
 --_000_5D805A6E0D414529B54D42244FCC7F99telefonicacom_-- From nobody Thu Jul 20 15:31:09 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 58A68129482 for ; Thu, 20 Jul 2017 15:31:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.001 X-Spam-Level: X-Spam-Status: No, score=-2.001 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=hq.sk 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 O8gVC-GKaZYr for ; Thu, 20 Jul 2017 15:31:05 -0700 (PDT) Received: from mail.hq.sk (hq.sk [81.89.59.181]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 052BB126B72 for ; Thu, 20 Jul 2017 15:31:05 -0700 (PDT) Received: from nitebug.localdomain (chello085216197060.chello.sk [85.216.197.60]) by mail.hq.sk (Postfix) with ESMTPSA id DD325242984; Fri, 21 Jul 2017 00:31:02 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hq.sk; s=mail; t=1500589862; bh=ayzYOlJrw1NL/b+EmQhv+3cCBQWd7SqhtWkqV72122s=; h=Subject:To:References:From:Date:In-Reply-To; b=d9RzRNx7VjEzvgWnpzT37ehmi1jtU7t6v59rlWMFYkPwNQF0PQvOqs9Clw9h0LIN5 jAn5rXk59kDzk9i563R3F0CstfEY82cD5ftcU1f4HezR+0h26oCmPslVNVMIZDVLcH 4NohE0J9QJKyELdhZkAUEPvS+W6rHGKvAR31YF2A= To: Ramon Casellas , pce@ietf.org References: <8f97e560-1ce5-49c4-8733-aafcc0668534@cttc.es> From: Robert Varga Message-ID: Date: Fri, 21 Jul 2017 00:31:02 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <8f97e560-1ce5-49c4-8733-aafcc0668534@cttc.es> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="XqTn0qxOGwgAuS8IAXuC0ldCqSuPOBJcI" Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jul 2017 22:31:07 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --XqTn0qxOGwgAuS8IAXuC0ldCqSuPOBJcI Content-Type: multipart/mixed; boundary="DcN1eEsmx31hMh8KAdD4h3SX0Aq5lCcPk"; protected-headers="v1" From: Robert Varga To: Ramon Casellas , pce@ietf.org Message-ID: Subject: Re: [Pce] PCEP as an SDN controller protocol? References: <8f97e560-1ce5-49c4-8733-aafcc0668534@cttc.es> In-Reply-To: <8f97e560-1ce5-49c4-8733-aafcc0668534@cttc.es> --DcN1eEsmx31hMh8KAdD4h3SX0Aq5lCcPk Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hello, On 20/07/17 18:46, Ramon Casellas wrote: > We have implemented BGP-LS but I see no reason why PCEP cannot be > extended for the same (PCEP-LS) being almost functionally equivalent. With my stateful-pcep co-author hat on, I have to say this boils down to what is really needed at the protocol layer. At its core PCEP is BGP with RPCs on top of it. NETCONF can do the same thing (if you add binary encoding and fix the notification model, which is actively being done). PCEP has native binary encoding, but on the other hand I always have to deal with the capability matrix in my parser.= =46rom the protocol perspective, I think all we need to do is to specify how externally-modeled data can be exchanged between PCEs/PCCs and their discovery (which can be done in negotiation phase) -- something in the vein of gNMI. =46rom the architecture perspective, defining modes of operation in terms= RPC/flooding interactions are worthwhile. Beyond that, yes, PCEP can tunnel any sort of reasonably-sized data and perform all sorts of client/server/proxy interactions, but is creating an uber-protocol a good idea? I think LSPDB and IGP information boils down to flooding, there are only two benefits of running IGP-over-PCEP vs. PCEP+BGP/LS I can see: 1) Total event ordering 2) Single failure domain both of which are implied by running over a single session. Regards, Robert --DcN1eEsmx31hMh8KAdD4h3SX0Aq5lCcPk-- --XqTn0qxOGwgAuS8IAXuC0ldCqSuPOBJcI Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQI/BAEBCgApFiEEj8CFcGydMnp9J9aFKwPBKqDPANMFAllxLyYLHG5pdGVAaHEu c2sACgkQKwPBKqDPANMzsg//ZCJKE5dvlKkfQwxU0lq5kd7JrwttQUvsBLj24XAV 563fqB2CWSbPWC7mDqY0FCYk09V3UavnOWWkSVNS7jFiLguaIS0cgmD8rxE2nsWE InZEj5ypJn5o+JKcFZhBl5vdnBqX6PReZVdpWkOKvST2Vzbiza4733JpJgsWXItM 8SClp74LDzFpyBw2c46MuxhGs0G3zmM69tUY+JCkLDUhiA55G4+H36DYUeiX8oyj 7X5LjLd+UcBmTt1B/KN/BNwi8Z4wB1AY7FZIb2VjgKcM0fhDU0ehnscplxqf82YC h7ODmr41RvtYmo5ptqIf+5OUClaiZnlOkRzxOQaHkUfXla0ekmNDMOhPXYBPX0AU Ny5tOnfXFwm0tOKTh6cP67biYYXL1vT+5+6wn4Ism1vT53AB2mnDd3/DzichOt7X UAQfFioXhvAbwRjcGZFUHcttT5C7abh9XO5DdZFy+jLSJ2uQxCe5Mone+c57LaJq LiT+lhLMD763iEHChgjBWaVU37h/PgCi5HOgRPscbR9iX4nrUS8qX7bxMM6ZMt/Q XbCrwUWTRxWX34Hbh1VN5JlezXRHSIsawwSzWbLwyfip6UIGRzUjCEwRqOKaForu wqlJgwPGpX79K3biM+EtA/bjKJqkczSC26X+kwLZFMNAuaasTxyDzJSIO1DVso1j Bls= =l3O9 -----END PGP SIGNATURE----- --XqTn0qxOGwgAuS8IAXuC0ldCqSuPOBJcI-- From nobody Thu Jul 20 19:31:20 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D0C1129AA8; Thu, 20 Jul 2017 19:31:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5kB8VFiM4b0J; Thu, 20 Jul 2017 19:31:16 -0700 (PDT) Received: from m176115.mail.qiye.163.com (m176115.mail.qiye.163.com [59.111.176.115]) by ietfa.amsl.com (Postfix) with ESMTP id 9AB4E12EB9B; Thu, 20 Jul 2017 19:31:14 -0700 (PDT) Received: from WangajPC (unknown [219.142.69.78]) by m176115.mail.qiye.163.com (Hmail) with ESMTPA id 49FA4661AB6; Fri, 21 Jul 2017 10:31:12 +0800 (CST) From: "Aijun Wang" To: "'Jonathan Hardwick'" , Cc: References: In-Reply-To: Date: Fri, 21 Jul 2017 10:31:09 +0800 Message-ID: <00c301d301c9$69aff5b0$3d0fe110$@org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C4_01D3020C.77D335B0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgAYza0A Content-Language: zh-cn X-HM-Spam-Status: e1kIGBQJHllBS1VLV1koWUFKTEtLSjdXWS1ZQUlXWQkOFx4IWUFZMjUtOj cyP0FLVUtZBg++ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Mxg6HBw5GDo#VlECIjAtTw4z Ei8wCR9VSlVKTktLTUtPSUxJTU1LVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxDWVdZCAFZQUpCTEJNNwY+ X-HM-Tid: 0a5d62fc0f369373kuws49fa4661ab6 Archived-At: Subject: [Pce] =?gb2312?b?tPC4tDogIFBDRVAgYXMgYW4gU0ROIGNvbnRyb2xsZXIgcHJv?= =?gb2312?b?dG9jb2w/?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jul 2017 02:31:18 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_00C4_01D3020C.77D335B0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable Hi, =20 I support the idea of selecting PCEP as an SDN controller protocol, but = did not support the idea that let PCEP do all the work that IGP/BGP has accomplished. >From the viewpoint of network operator, we think SDN can introduce some flexibility/controllability to our network and we think the future = network should be the integration of centrally control and traditional = distributed protocol. And we have present CCDR(Centrally Control Dynamic Routing) (CCDR Presentation Material = ) at IETF99 and PCE in Native IP network at IETF98 in TEAS WG to introduce the idea that use PCE/SDN controller within Native IP network and also the related PCEP extension proposal to accomplish such aim. Any idea is welcome to support our scenario and solution. =20 =20 Best Regards. =20 Aijun Wang Network R&D and Operation Support Department China Telecom Corporation Limited Beijing Research Institute,Beijing, = China. =20 =B7=A2=BC=FE=C8=CB: Pce [mailto:pce-bounces@ietf.org] =B4=FA=B1=ED = Jonathan Hardwick =B7=A2=CB=CD=CA=B1=BC=E4: 2017=C4=EA7=D4=C220=C8=D5 23:22 =CA=D5=BC=FE=C8=CB: pce@ietf.org =B3=AD=CB=CD: pce-chairs@ietf.org =D6=F7=CC=E2: [Pce] PCEP as an SDN controller protocol? =20 Dear PCE WG =20 The purpose of this email is to initiate a discussion about whether we = want to extend PCEP to allow it to replace the functions that are = traditionally provided by the routing and signalling protocols. =20 Originally, PCEP was designed with the goal of providing a distributed = path computation service. In recent years we have extended that mission, and added path modification and path instantiation capabilities to PCEP. = This has added capabilities to PCEP that would traditionally have been = performed by the network management plane. =20 We are now starting to discuss proposals to add more capabilities to = PCEP =A8C capabilities that are traditionally part of routing and signalling. = There were three examples of this in the PCE working group meeting this week. =A1=A4 The PCECC proposal, which extends PCEP=A1=AFs path = instantiation capability so that the PCE can provision a path end-to-end by touching = each hop along the path. This replaces the function already provided by = RSVP-TE. =A1=A4 The PCEP-LS proposal, which extends PCEP to allow link = state and TE information to be communicated from the network to the PCE. This replaces the link state flooding function provided by the IGPs, or = BGP-LS. =A1=A4 The PCECC-SR proposal extends PCEP to allow device-level configuration to be communicated between the network and the PCE, such = as SRGBs, prefix SIDs etc. Again, this replaces functions that are already designed into the IGPs. =20 These proposals are taking PCEP in the direction of being a = fully-fledged SDN protocol. With these proposals, one can envision a network in which there is no traditional control plane. PCEP is used to communicate the current network state and to program flows. These proposals have their roots in the ACTN and PCECC architectures that are adopted within the = TEAS working group. TEAS is very much assuming that this is the direction = that we want to take PCEP in. However, there are two procedural issues, as I = see it. 1. We have not had an explicit discussion in the PCE WG about = whether we want to take PCEP in this direction. We have had a few lively = debates on specific cases, like PCEP-LS, but those cases represent the =A1=B0thin = end of the wedge=A1=B1. If we start down this path then we are accepting that = PCEP will replace the functions available in the traditional control plane. = We need to test whether there is a consensus in the working group to move = in that direction. 2. We do not currently have a charter that allows us to add this = type of capability to PCEP. Depending on the outcome of discussion (1), we = can of course extend the charter. =20 This email is to initiate the discussion (1). So, please reply to the mailing list and share your thoughts on whether PCEP should be extended = in this direction, and how far we should go. =20 I am hoping to get more than just =A1=B0yes=A1=B1 or =A1=B0no=A1=B1 = answers to this question (although that would be better than no answer). I would like to hear justifications for or against. Such as, which production networks would = run PCEP in place of a traditional control plane? Why is it not desirable = to solve the problems in those networks with the traditional control plane? What harm could this do? What would be the operational problems = associated with adding these functions to PCEP? =20 Many thanks Jon =20 ------=_NextPart_000_00C4_01D3020C.77D335B0 Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable

Hi,

 

I support the idea of selecting = PCEP as an SDN controller protocol, but did not support the idea that = let PCEP do all the work that IGP/BGP has = accomplished.

From the viewpoint = of network operator, we think SDN can introduce some = flexibility/controllability to our network and we think the future = network should be the integration of centrally control and traditional = distributed  protocol.

And we have present = CCDR(Centrally Control Dynamic Routing) (CCDR Presentation Material) at IETF99 and PCE in Native IP network at IETF98 in TEAS WG to introduce = the idea that use PCE/SDN controller within Native IP network and also = the related PCEP extension proposal to accomplish such aim.

Any idea is welcome to support = our scenario and solution.

 

 

Best = Regards.

 

Aijun = Wang

Network R&D = and Operation Support Department

China Telecom = Corporation Limited Beijing Research Institute,Beijing, = China.

 

=B7=A2=BC=FE=C8=CB: Pce = [mailto:pce-bounces@ietf.org] =B4=FA=B1=ED = Jonathan = Hardwick
=B7=A2=CB=CD=CA=B1=BC= =E4: 2017=C4=EA7=D4=C220=C8=D5 23:22
=CA=D5=BC=FE=C8=CB: = pce@ietf.org
=B3=AD=CB=CD: = pce-chairs@ietf.org
=D6=F7=CC=E2: [Pce] PCEP as an SDN = controller protocol?

 

Dear PCE WG

 

The purpose of this email is to = initiate a discussion about whether we want to extend PCEP to allow it = to replace the functions that are traditionally provided by the routing = and signalling protocols.

 

Originally, PCEP was designed with = the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification = and path instantiation capabilities to PCEP.  This has added = capabilities to PCEP that would traditionally have been performed by the = network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP =A8C capabilities that are = traditionally part of routing and signalling.  There were three = examples of this in the PCE working group meeting this = week.

=A1=A4        The PCECC proposal, which extends PCEP=A1=AFs path = instantiation capability so that the PCE can provision a path end-to-end = by touching each hop along the path.  This replaces the function = already provided by RSVP-TE.

=A1=A4        The PCEP-LS proposal, which extends PCEP to allow link = state and TE information to be communicated from the network to the = PCE.  This replaces the link state flooding function provided by = the IGPs, or BGP-LS.

=A1=A4        The PCECC-SR proposal extends PCEP to allow device-level = configuration to be communicated between the network and the PCE, such = as SRGBs, prefix SIDs etc.  Again, this replaces functions that are = already designed into the IGPs.

 

These proposals are taking PCEP in = the direction of being a fully-fledged SDN protocol.  With these = proposals, one can envision a network in which there is no traditional = control plane.  PCEP is used to communicate the current network = state and to program flows.  These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS = working group.  TEAS is very much assuming that this is the = direction that we want to take PCEP in.  However, there are two = procedural issues, as I see it.

1.      We have not had an explicit discussion in the PCE WG about = whether we want to take PCEP in this direction.  We have had a few = lively debates on specific cases, like PCEP-LS, but those cases = represent the =A1=B0thin end of the wedge=A1=B1.  If we start down = this path then we are accepting that PCEP will replace the functions = available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that = direction.

2.      We do not currently have a charter that allows us to add = this type of capability to PCEP.  Depending on the outcome of = discussion (1), we can of course extend the = charter.

 

This email is to initiate the discussion (1).  So, = please reply to the mailing list and share your thoughts on whether PCEP = should be extended in this direction, and how far we should = go.

 

I am hoping to get more than just =A1=B0yes=A1=B1 or = =A1=B0no=A1=B1 answers to this question (although that would be better = than no answer).  I would like to hear justifications for or = against.  Such as, which production networks would run PCEP in = place of a traditional control plane?  Why is it not desirable to = solve the problems in those networks with the traditional control = plane?  What harm could this do?  What would be the = operational problems associated with adding these functions to = PCEP?

 

Many thanks

Jon

 

------=_NextPart_000_00C4_01D3020C.77D335B0-- From nobody Fri Jul 21 01:02:27 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B6AB5131748; Fri, 21 Jul 2017 01:02:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.218 X-Spam-Level: X-Spam-Status: No, score=-4.218 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u9aio3dWPIVE; Fri, 21 Jul 2017 01:02:16 -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 6378A12EB2B; Fri, 21 Jul 2017 01:02:15 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DKZ54112; Fri, 21 Jul 2017 08:02:12 +0000 (GMT) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.301.0; Fri, 21 Jul 2017 09:01:54 +0100 Received: from SJCEML702-CHM.china.huawei.com ([169.254.4.153]) by SJCEML703-CHM.china.huawei.com ([169.254.5.240]) with mapi id 14.03.0301.000; Fri, 21 Jul 2017 01:01:48 -0700 From: Leeyoung To: Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgAj+ROA Date: Fri, 21 Jul 2017 08:01:47 +0000 Message-ID: <7AEB3D6833318045B4AE71C2C87E8E172B3EF085@SJCEML702-CHM.china.huawei.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.210.170.172] Content-Type: multipart/alternative; boundary="_000_7AEB3D6833318045B4AE71C2C87E8E172B3EF085SJCEML702CHMchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0207.5971B505.00FC, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.153, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 46445f171ac639844abf3e0684adfa8c Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jul 2017 08:02:20 -0000 --_000_7AEB3D6833318045B4AE71C2C87E8E172B3EF085SJCEML702CHMchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, I support PCE as an SDN controller architecture and PCEP as an SDN controll= er protocol. Over the course of time, PCE has evolved little by little toward SDN evolut= ion starting from path computation function to be centrally controlled. I b= elieve this is the first SN concept even before SDN was termed officially. = Then we have seen the next step into more functionality given to PCEP; Stat= eful PCE has become a tool for path provisioning. Recently, with ACTN and P= CE CC, PCE plays more role of assigning labels and managing LSPs. The only = missing puzzle has been centralized link-state and TE resource discovery me= chanism which is known as PCEP-LS. Clearly, PCE is an SDN architecture and = PCEP can become a full-fledged solution for SDN. The advantage of PCEP-LS is as follows: As we are proposing using direct PC= EP session to all nodes, PCEP-LS would be fastest to learn TE information. = It is also a binary protocol which is faster than text-based. One thing to = note for PCEP-LS, we are using LS-ID (stateful) concept where a B/W change,= for example, can be updated only with BW TLV without other link properties= . This saves packet size and encoding/decoding time is faster than distribu= ted mechanisms. In a nutshell, I would be really excited to see PCE WG to embrace PCEP a fu= ll-fledged SDN controller protocol and I would like to contribute with pass= ion. Thanks, Young From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 5:22 PM To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon --_000_7AEB3D6833318045B4AE71C2C87E8E172B3EF085SJCEML702CHMchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,<= /p>

 

I support PCE as an SD= N controller architecture and PCEP as an SDN controller protocol.

 

Over the course of tim= e, PCE has evolved little by little toward SDN evolution starting from path= computation function to be centrally controlled. I believe this is the fir= st SN concept even before SDN was termed officially. Then we have seen the next step into more functionality given = to PCEP; Stateful PCE has become a tool for path provisioning. Recently, wi= th ACTN and PCE CC, PCE plays more role of assigning labels and managing LS= Ps. The only missing puzzle has been centralized link-state and TE resource discovery mechanism which is k= nown as PCEP-LS. Clearly, PCE is an SDN architecture and PCEP can become a = full-fledged solution for SDN.

 

The advantage of PCEP-= LS is as follows: As we are proposing using direct PCEP session to all node= s, PCEP-LS would be fastest to learn TE information. It is also a binary pr= otocol which is faster than text-based. One thing to note for PCEP-LS, we are using LS-ID (stateful) concept where= a B/W change, for example, can be updated only with BW TLV without other l= ink properties. This saves packet size and encoding/decoding time is faster= than distributed mechanisms.

 

In a nutshell, I would= be really excited to see PCE WG to embrace PCEP a full-fledged SDN control= ler protocol and I would like to contribute with passion.

 

Thanks,

Young

 

From: Pce [mailto:pce-bounces@ietf.org] On= Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 5:22 PM
To: pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?

 

Dear PCE WG

 

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

 

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP – capabilities that are tr= aditionally part of routing and signalling.  There were three examples= of this in the PCE working group meeting this week.

·        The PCECC proposal, whi= ch extends PCEP’s path instantiation capability so that the PCE can p= rovision a path end-to-end by touching each hop along the path.  This = replaces the function already provided by RSVP-TE.

·        The PCEP-LS proposal, w= hich extends PCEP to allow link state and TE information to be communicated= from the network to the PCE.  This replaces the link state flooding f= unction provided by the IGPs, or BGP-LS.

·        The PCECC-SR proposal e= xtends PCEP to allow device-level configuration to be communicated between = the network and the PCE, such as SRGBs, prefix SIDs etc.  Again, this = replaces functions that are already designed into the IGPs.

 

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.  PCEP is used to communicate the current network state and to program flows.  These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.  TEAS is very much assuming that this is the directi= on that we want to take PCEP in.  However, there are two procedural issues, as I see it.

1.  = ;    We have not had an expl= icit discussion in the PCE WG about whether we want to take PCEP in this di= rection.  We have had a few lively debates on specific cases, like PCE= P-LS, but those cases represent the “thin end of the wedge”.  If we start down this path then we are acce= pting that PCEP will replace the functions available in the traditional con= trol plane.  We need to test whether there is a consensus in the worki= ng group to move in that direction.

2.  = ;    We do not currently hav= e a charter that allows us to add this type of capability to PCEP.  De= pending on the outcome of discussion (1), we can of course extend the chart= er.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

 

I am hoping to get more than ju= st “yes” or “no” answers to this question (although= that would be better than no answer).  I would like to hear justifica= tions for or against.  Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational probl= ems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

--_000_7AEB3D6833318045B4AE71C2C87E8E172B3EF085SJCEML702CHMchi_-- From nobody Fri Jul 21 01:31:17 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 962211317C1 for ; Fri, 21 Jul 2017 01:31:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.62 X-Spam-Level: X-Spam-Status: No, score=-2.62 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RLLjoNiCph1C for ; Fri, 21 Jul 2017 01:31:11 -0700 (PDT) Received: from asmtp5.iomartmail.com (asmtp5.iomartmail.com [62.128.201.176]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9335D12778D for ; Fri, 21 Jul 2017 01:31:11 -0700 (PDT) Received: from asmtp5.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp5.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6L8V93P022749 for ; Fri, 21 Jul 2017 09:31:09 +0100 Received: from 950129200 (dhcp-8d56.meeting.ietf.org [31.133.141.86]) (authenticated bits=0) by asmtp5.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6L8V7aY022720 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 21 Jul 2017 09:31:08 +0100 Reply-To: From: "Adrian Farrel" To: Date: Fri, 21 Jul 2017 09:31:05 +0100 Message-ID: <0dbc01d301fb$b2b2d5c0$18188140$@olddog.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AdMB+63hkBfcP0tGSSmZUoYEJe2kUQ== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23208.006 X-TM-AS-Result: No--12.685-10.0-31-10 X-imss-scan-details: No--12.685-10.0-31-10 X-TMASE-MatchedRID: le1dUZb+QbNlx7C8em/tVmgws6g0ewz2cK8qHvdFHLAcZFsYO/SuCHx4 MHU3cDN223e6ga05TadI7JPsZpNRgSYLU26hJckU5Lm3wIkdqWPE7VS7Jqt76dJgDNnoqapaLl/ OrQsMCLirOei4RDEWn2jXG+JH7VI6hHRwYf/w/Q8R0Wxq9RAoBweDbc64+XV0WltirZ/iPP4Gdg gEvITySAVHaWN6N+gNA5RvNZTOZS9XROE6PAP2XMikxLAkSHclk9atiES99p0xiSY0g7v6Fn2pM 3AyIoP6hk7tLsLLq2lUFwwCbZvpDdEQrO9Lrj6hF9jfTqcDduiBjLzL4do+VjDJ9a3KikGoHbob gs7O7X7ZbKeIhXhJa6cd6slZKiMUA3OZO30DykjThGbP9qB93I9TcNl/C6qrEYcWuAHCdKujxYy RBa/qJX3mXSdV7KK4OubYLCVnBVGsWV0bdkf4OUgajxvGuzmh/qQWeSdipa9B+ZSJAQQrHY8cE3 Q+bvsH+LYnQRT5lCzkj8kytu6bzA== Archived-At: Subject: [Pce] Some further thoughts about PCEP and SDN X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jul 2017 08:31:14 -0000 Maybe two further points to think about. 1. Students of PCE in an SDN context might like to refresh their memory of RFC 7491. 2. "PCEP is like BGP, so PCEP-LS is like BGP-LS" I put this in quotes because I am not necessarily saying it, but it is being said. At a protocol level (and maybe seen from far enough away) BGP is a pretty simple, TCP-based protocol. So is PCEP. Of course, PCEP is a request/response protocol, but it also has the facility for push-mode. BGP-LS as a concept is not just about pushing the full topology information. Of course, you could do that, but it is not necessarily what you would want to do in all situations. Something that BGP implementations are generally good at is "applying policy to routing information". Something that a BGP-LS speaker may do (especially in a TE environment) is to abstract or aggregate network information through the application of routing policy so that the topology information exported is in some sense limited and specific to the application of the BGP-LS consumer (see also RFC 7926). Saying "I already have a PCEP implementation and I want to re-use that code" is a reasonable thing, but implementers should be aware that the protocol may be the smaller part of the implementation: the mapping from IGP LSDB and local TED to the exported data may require much more code and considerably more smarts. 3. (Yes, the third of my two points) This isn't simply a trade between BGP-LS and PCEP-LS. We are also actively working on YANG models to describe topology (mainly in TEAS and I2RS?) so there is also a "competition" with Netconf/YANG. Many configurable devices already support Netconf. I think that the existence of two mechanisms to do LS export does not predicate against making a third. The market is already going to have to decide between two solutions: dropping a third into the mix is not going to make anything worse especially given the various reasons to choose between protocols. 4. (Did I say I had just two points?) The data encoding for PCEP-LS is "interesting". One could imagine: - deriving a new encoding that is optimal for PCEP - re-using the BGP-LS encodings (and so saving effort and debug for implementers of both systems) - re-using YANG/JSON encodings from YANG models (so saving effort, etc.) The idea of using PCEP to move XML has been raised before. 5. (Yes, but it is my last point) There is work proposed to give a NBI to PCE by presenting PCE requests (i.e., messages) using Netconf/RESTconf as an RPC with YANG-encoded requests. This is relevant because it feeds back into the encoding issue. All this discussion is, I think, a good thing. I don't believe it should inhibit any of the proposed work items, but it may change how they evolve. It is certainly important for our long-term view of PCE in an SDN world. Enjoy! Adrian From nobody Fri Jul 21 02:28:58 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A5EB1129B7F; Fri, 21 Jul 2017 02:28:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 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, MIME_QP_LONG_LINE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SiKugNuTx_Vc; Fri, 21 Jul 2017 02:28:55 -0700 (PDT) Received: from mail-wr0-x244.google.com (mail-wr0-x244.google.com [IPv6:2a00:1450:400c:c0c::244]) (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 E0627129B4C; Fri, 21 Jul 2017 02:28:54 -0700 (PDT) Received: by mail-wr0-x244.google.com with SMTP id y67so11105162wrb.3; Fri, 21 Jul 2017 02:28:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=user-agent:date:subject:from:to:cc:message-id:thread-topic :mime-version; bh=dsz+hR7ndyBpkz1gifqcXENYp6Ucq3q5ls2CnBp7WdI=; b=LBF7HOfBlk7GHjHp2dTHfNhdTpJoZVgpy2WpWGJenP0GE8Nx+LAInpdSXshELV+loC 18txXNLZJ2IsfEc0oWrW/KtKaPupFmKIjLTkH7dllq9oakGlVJdReVxzFXbcKRLioBIz crzecQIxI9TAYBVJiaALd1GKjweD3sA+ydooQXRjgcK1lW9BgSVUZ1sJ+w5ArG6t0MQP yALWu4PTx4QHvLx3scb9WieLxKnU2EYbqPNgb/uDKjypakiRbuXo0fTmvfCwYNt9GBKX vcjtMzHCSzSTRleV7IwG97GD9m/0+c7++99laaTmUzgB/E+Qyr7KYjsHyoNVcpbP2pp2 vRPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:user-agent:date:subject:from:to:cc:message-id :thread-topic:mime-version; bh=dsz+hR7ndyBpkz1gifqcXENYp6Ucq3q5ls2CnBp7WdI=; b=nqvjgoiDBMmkh9t5g/e70UuhdRn078LUYycWnMxZDm7tVOj7riU5JQ0WZfTdSFgrBT 3SibuHoVfg+w3p1n7aHk6uwYzv9oacSbPs3hk1WJE/9SG8NGuskvSeIianhVygOMLxnO jFCbLsXKFF32evGgpYlBDil8+Ln6mOkv+dpJgUHieTPx37QrLF98X0BaK6S+DM+nC8qO f+I3Q4Gw3mn1bYUTej1ZFm65NQMgIygsDpa96tINE59sFR2/abellXWSy+rG671iaPgn Rwt7K1FHga+tAembHnC2JrhJ1jkweVOMiuRaANVEGRxuoPXQkPQXUS6M0vL9FtFteBst 10vQ== X-Gm-Message-State: AIVw110rjTVEqH0GYTW0JqBkZ8VOpRRHxu/o+YGNq9p249NiYZaGcuWv xK5PbsmdyW3fsEx8 X-Received: by 10.223.138.167 with SMTP id y36mr9391422wry.176.1500629333355; Fri, 21 Jul 2017 02:28:53 -0700 (PDT) Received: from [31.133.131.152] ([2001:67c:370:128:cde4:635e:ba5b:7eae]) by smtp.gmail.com with ESMTPSA id 1sm850835wmn.32.2017.07.21.02.28.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 21 Jul 2017 02:28:52 -0700 (PDT) User-Agent: Microsoft-MacOutlook/f.24.0.170702 Date: Fri, 21 Jul 2017 11:28:51 +0200 From: Jeff Tantsura To: Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Message-ID: <7223125B-B876-43CC-92FB-834F5E83D023@gmail.com> Thread-Topic: [Pce] PCEP as an SDN controller protocol? Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3583481332_2150988772" Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jul 2017 09:28:57 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3583481332_2150988772 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable Hi, =20 We crossed this bridge quite some time ago, so let=E2=80=99s just admit it =E2=98=BA =20 1. Let=E2=80=99s be clear -=C2=A0 we are not trying to define a new =E2=80=9Choly SDN proto= col ala OF=E2=80=9D, in most T-SDN ecosystems PCEP has been used as one of SBI=E2=80=99s= since the beginning. 2. PCEP creates state that is ephemeral, not a configuration in a classical= sense, I=E2=80=99m rather unconvinced we=E2=80=99d want to change that. 3. PCEP is not BGP can can=E2=80=99t easily be turned into kitchen sink, moreover= it doesn=E2=80=99t have BGP hierarchical properties. LS transport (not just TED) = is not a trivial task, we should be rather careful. =20 With all the above =E2=80=93 let=E2=80=99s just state the obvious and move on =C2=A0 Cheers, Jeff =20 From: Pce on behalf of Jonathan Hardwick Date: Thursday, July 20, 2017 at 17:22 To: "pce@ietf.org" Cc: "pce-chairs@ietf.org" Subject: [Pce] PCEP as an SDN controller protocol? =20 Dear PCE WG =20 The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally = provided by the routing and signalling protocols. =20 Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and ad= ded path modification and path instantiation capabilities to PCEP. This has= added capabilities to PCEP that would traditionally have been performed by = the network management plane. =20 We are now starting to discuss proposals to add more capabilities to PCEP =E2= =80=93 capabilities that are traditionally part of routing and signalling. Ther= e were three examples of this in the PCE working group meeting this week. =C2=B7 The PCECC proposal, which extends PCEP=E2=80=99s path instantiation ca= pability so that the PCE can provision a path end-to-end by touching each ho= p along the path. This replaces the function already provided by RSVP-TE. =C2=B7 The PCEP-LS proposal, which extends PCEP to allow link state and= TE information to be communicated from the network to the PCE. This replac= es the link state flooding function provided by the IGPs, or BGP-LS. =C2=B7 The PCECC-SR proposal extends PCEP to allow device-level configu= ration to be communicated between the network and the PCE, such as SRGBs, pr= efix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. =20 These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which ther= e is no traditional control plane. PCEP is used to communicate the current = network state and to program flows. These proposals have their roots in the= ACTN and PCECC architectures that are adopted within the TEAS working group= . TEAS is very much assuming that this is the direction that we want to tak= e PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether= we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cthin end of= the wedge=E2=80=9D. If we start down this path then we are accepting that PCEP w= ill replace the functions available in the traditional control plane. We ne= ed to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type= of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. =20 This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this = direction, and how far we should go. =20 I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this que= stion (although that would be better than no answer). I would like to hear = justifications for or against. Such as, which production networks would run= PCEP in place of a traditional control plane? Why is it not desirable to s= olve the problems in those networks with the traditional control plane? Wha= t harm could this do? What would be the operational problems associated wit= h adding these functions to PCEP? =20 Many thanks Jon =20 _______________________________________________ Pce mailing list Pce@ietf.o= rg https://www.ietf.org/mailman/listinfo/pce=20 --B_3583481332_2150988772 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

Hi,

 

We crossed this bridge quite some time ago, so let=E2=80=99s just admit it =E2=98=BA

 

<= span style=3D'font-size:12.0pt'>1. Let=E2=80=99s be clear -=C2=A0 we are not trying to d= efine a new =E2=80=9Choly SDN protocol ala OF=E2=80=9D, in most T-SDN ecosystems PCEP ha= s been used as one of SBI=E2=80=99s since the beginning.

2. PCEP creates state that is = ephemeral, not a configuration in a classical sense, I=E2=80=99m rather unconvince= d we=E2=80=99d want to change that.

3. PCEP is not BGP can can=E2=80=99t easily be turned int= o kitchen sink, moreover it doesn=E2=80=99t have BGP hierarchical properties. LS t= ransport (not just TED) is not a trivial task, we should be rather careful.<= o:p>

=  

Wit= h all the above =E2=80=93 let=E2=80=99s just state the obvious and move on

=C2=A0

Ch= eers,

Jeff

 

From: Pce <pce-bounces@ietf.org> on behalf of Jonathan Hardwick= <Jonathan.Hardwick@metaswitch.com>
Date: Thursday, July 20,= 2017 at 17:22
To: "pce@ietf.org" <pce@ietf.org>Cc: "pce-chairs@ietf.org" <pce-chairs@ietf.org>
= Subject: [Pce] PCEP as an SDN controller protocol?<= /p>

 <= /p>

Dear PCE WG<= /p>

 

The purpose of this email is to initiate= a discussion about whether we want to extend PCEP to allow it to replace th= e functions that are traditionally provided by the routing and signalling pr= otocols.

 

Originally, PCEP was= designed with the goal of providing a distributed path computation service.=   In recent years we have extended that mission, and added path modific= ation and path instantiation capabilities to PCEP.  This has added capa= bilities to PCEP that would traditionally have been performed by the network= management plane.

 

We are now= starting to discuss proposals to add more capabilities to PCEP =E2=80=93 capabili= ties that are traditionally part of routing and signalling.  There were= three examples of this in the PCE working group meeting this week.

=C2=B7=C2=B7        = ; The PCEP-LS proposal, = which extends PCEP to allow link state and TE information to be communicated= from the network to the PCE.  This replaces the link state flooding fu= nction provided by the IGPs, or BGP-LS.

=C2=B7    &n= bsp;    T= he PCECC-SR proposal extends PCEP to allow device-level configuration to be = communicated between the network and the PCE, such as SRGBs, prefix SIDs etc= .  Again, this replaces functions that are already designed into the IG= Ps.

 

These proposals are takin= g PCEP in the direction of being a fully-fledged SDN protocol.  With th= ese proposals, one can envision a network in which there is no traditional c= ontrol plane.  PCEP is used to communicate the current network state an= d to program flows.  These proposals have their roots in the ACTN and P= CECC architectures that are adopted within the TEAS working group.  TEA= S is very much assuming that this is the direction that we want to take PCEP= in.  However, there are two procedural issues, as I see it.=

1.=      &nb= sp; We have not had an explicit= discussion in the PCE WG about whether we want to take PCEP in this directi= on.  We have had a few lively debates on specific cases, like PCEP-LS, = but those cases represent the =E2=80=9Cthin end of the wedge=E2=80=9D.  If we start= down this path then we are accepting that PCEP will replace the functions a= vailable in the traditional control plane.  We need to test whether the= re is a consensus in the working group to move in that direction.=

2.=      &nb= sp; We do not currently have a = charter that allows us to add this type of capability to PCEP.  Dependi= ng on the outcome of discussion (1), we can of course extend the charter.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your tho= ughts on whether PCEP should be extended in this direction, and how far we s= hould go.

 

I am hoping to get = more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this question (although that= would be better than no answer).  I would like to hear justifications = for or against.  Such as, which production networks would run PCEP in p= lace of a traditional control plane?  Why is it not desirable to solve = the problems in those networks with the traditional control plane?  Wha= t harm could this do?  What would be the operational problems associate= d with adding these functions to PCEP?

 

Many thanks

Jon

 

_____________________= __________________________ Pce mailing list Pce@ietf.org https://www.ietf.or= g/mailman/listinfo/pce

--B_3583481332_2150988772-- From nobody Fri Jul 21 08:07:12 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 19616131E30; Fri, 21 Jul 2017 08:07:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.021 X-Spam-Level: X-Spam-Status: No, score=-2.021 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=metaswitch.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id onY0Q3_lzKLV; Fri, 21 Jul 2017 08:07:09 -0700 (PDT) Received: from NAM03-DM3-obe.outbound.protection.outlook.com (mail-dm3nam03on0125.outbound.protection.outlook.com [104.47.41.125]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA5A2131892; Fri, 21 Jul 2017 08:07:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=metaswitch.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=d8zxuBbcxfHrgEuyPv+Er4EMrB/sN5SCYaXrtsTgYuo=; b=bh/xpwsU3TmhBhdFSkI3PWJcrJhdUdyUaLRs7Ko9aEtCnC5kc0n4wd6MaVBF8LNnjAYjeaU9fIpdUUuVgwAv81eIWfX8apNLPpJY7F5Y46q+j1kf98p7L6i6cICKnRDpAq07mTQ8PjrF146/obGI5OGsKbJrwYls8UBneI2wNm8= Received: from BY2PR0201MB1910.namprd02.prod.outlook.com (10.163.75.152) by BY2PR0201MB1912.namprd02.prod.outlook.com (10.163.75.154) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1261.13; Fri, 21 Jul 2017 15:07:02 +0000 Received: from BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) by BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) with mapi id 15.01.1261.024; Fri, 21 Jul 2017 15:07:01 +0000 From: Jonathan Hardwick To: "pce@ietf.org" , "draft-ietf-pce-lsp-setup-type@ietf.org" , "draft-ietf-pce-segment-routing@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Thread-Index: AdMCL6Ly08SduGL5TD6iP+F1jVMo6g== Date: Fri, 21 Jul 2017 15:07:01 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Jonathan.Hardwick@metaswitch.com; x-originating-ip: [62.168.35.68] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; BY2PR0201MB1912; 7: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 x-ms-office365-filtering-correlation-id: 9cead6fc-20a4-4adc-2862-08d4d04a23e5 x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254075)(300000503095)(300135400095)(2017052603031)(201703131423075)(201703031133081)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); SRVR:BY2PR0201MB1912; x-ms-traffictypediagnostic: BY2PR0201MB1912: x-exchange-antispam-report-test: UriScan:(151999592597050)(26388249023172)(21748063052155); x-microsoft-antispam-prvs: x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(100000700101)(100105000095)(100000701101)(100105300095)(100000702101)(100105100095)(6040450)(601004)(2401047)(5005006)(8121501046)(93006095)(93001095)(3002001)(100000703101)(100105400095)(10201501046)(6041248)(20161123560025)(20161123564025)(20161123558100)(201703131423075)(201702281528075)(201703061421075)(201703061406153)(20161123562025)(20161123555025)(6072148)(100000704101)(100105200095)(100000705101)(100105500095); SRVR:BY2PR0201MB1912; BCL:0; PCL:0; RULEID:(100000800101)(100110000095)(100000801101)(100110300095)(100000802101)(100110100095)(100000803101)(100110400095)(100000804101)(100110200095)(100000805101)(100110500095); SRVR:BY2PR0201MB1912; x-forefront-prvs: 0375972289 x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(979002)(6009001)(39410400002)(39400400002)(39850400002)(39450400003)(39840400002)(199003)(37854004)(189002)(72206003)(105586002)(3846002)(2501003)(50986999)(6436002)(68736007)(101416001)(7736002)(25786009)(2900100001)(189998001)(38730400002)(790700001)(6116002)(14454004)(102836003)(230783001)(97736004)(106356001)(33656002)(54896002)(66066001)(99286003)(86362001)(4326008)(7696004)(9686003)(2906002)(8936002)(77096006)(478600001)(6306002)(53936002)(3280700002)(8676002)(54356999)(81166006)(6506006)(74316002)(2201001)(5660300001)(450100002)(3660700001)(81156014)(55016002)(969003)(989001)(999001)(1009001)(1019001); DIR:OUT; SFP:1102; SCL:1; SRVR:BY2PR0201MB1912; H:BY2PR0201MB1910.namprd02.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: metaswitch.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_BY2PR0201MB19108484FE840A135963756784A40BY2PR0201MB1910_" MIME-Version: 1.0 X-OriginatorOrg: metaswitch.com X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jul 2017 15:07:01.2168 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9d9e56eb-f613-4ddb-b27b-bfcdf14b2cdb X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR0201MB1912 Archived-At: Subject: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jul 2017 15:07:11 -0000 --_000_BY2PR0201MB19108484FE840A135963756784A40BY2PR0201MB1910_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an import= ant decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker= to indicate that it can't (or won't) support RSVP-TE as a path setup type.= It is entirely plausible that a node might not support RSVP-TE, or else h= ave it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a sp= eaker to declare that they do or don't have support for RSVP-TE paths. The= re are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missin= g, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it= means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support = RSVP-TE. If this TLV is omitted, it will be assumed that they do support R= SVP-TE. The problem with (1) is that it is not backwards compatible. Any existing = SR implementation which also supports RSVP will not currently send this new= capability. So, if we make change (1) then forwards-level implementations= will incorrectly conclude that such backwards-level implementations do not= support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only d= o something ugly with a new protocol extension if we simply can't avoid doi= ng it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP= -TE environment that would be broken if we made change (1)? Thanks Jon --_000_BY2PR0201MB19108484FE840A135963756784A40BY2PR0201MB1910_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear PCE-ers

 

I don’t want to distract from the SDN topic to= o much, but we have an important decision to make about draft-ietf-pce-lsp-= setup-type.

 

The shepherd review raised an issue that there is no= way for a PCEP speaker to indicate that it can’t (or won’t) su= pport RSVP-TE as a path setup type.  It is entirely plausible that a n= ode might not support RSVP-TE, or else have it disabled, for example in an SR-only network.

 

We think that draft-ietf-pce-lsp-setup-type should b= e changed to allow a speaker to declare that they do or don’t have su= pport for RSVP-TE paths.  There are two proposals.

 

1.      Change draft-ietf-pce-lsp-setup-type so that speake= rs MUST include a (new) RSVP-TE-CAPABILITY TLV in their OPEN object.  = If this TLV if missing, but some other CAPABILITY TLV is present (such as S= R-CAPABILITY) then it means that the speaker does not support RSVP-TE as a path setup type.

2.      Change draft-ietf-pce-lsp-setup-type so that speake= rs MUST include a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if the= y DON’T support RSVP-TE.  If this TLV is omitted, it will be ass= umed that they do support RSVP-TE.

 

The problem with (1) is that it is not backwards com= patible.  Any existing SR implementation which also supports RSVP will= not currently send this new capability.  So, if we make change (1) th= en forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE.=

 

The problem with (2) is that it is ugly, and in my o= pinion we should only do something ugly with a new protocol extension if we= simply can’t avoid doing it.

 

And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we ma= de change (1)?

 

Thanks

Jon

 

--_000_BY2PR0201MB19108484FE840A135963756784A40BY2PR0201MB1910_-- From nobody Fri Jul 21 10:55:28 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 10631131C3B; Fri, 21 Jul 2017 10:55:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.618 X-Spam-Level: X-Spam-Status: No, score=-2.618 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vnigYohkPl6t; Fri, 21 Jul 2017 10:55:24 -0700 (PDT) Received: from asmtp1.iomartmail.com (asmtp1.iomartmail.com [62.128.201.248]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6881513192B; Fri, 21 Jul 2017 10:55:23 -0700 (PDT) Received: from asmtp1.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp1.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6LHtLos023996; Fri, 21 Jul 2017 18:55:21 +0100 Received: from 950129200 ([193.86.243.7]) (authenticated bits=0) by asmtp1.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6LHtJTI023989 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 21 Jul 2017 18:55:20 +0100 Reply-To: From: "Adrian Farrel" To: "'Jonathan Hardwick'" , , , Cc: References: In-Reply-To: Date: Fri, 21 Jul 2017 18:55:17 +0100 Message-ID: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0ECB_01D30252.E5CDA5F0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQFCsVj2MV66vwevRzfpEXYXn4SlsqN/MSfw Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23210.001 X-TM-AS-Result: No--27.828-10.0-31-10 X-imss-scan-details: No--27.828-10.0-31-10 X-TMASE-MatchedRID: HLMPCFyIyBOi+SMpuaYbajHzsy28T+GVTJDl9FKHbrlSh+MKXX54lJzL pt+eY0RYW5yCgZB+gAnLNTi0A8OgzsLk3xw1Sf9et1AhvyEKdj4Ly8o3bV9yTbV5fSMRD1zqB2C GisY5LlbvOZMCM2DEpVT7pLySGeP0zixg+Rb+x50n3rrPv7flKTcah+QZUHeOnNgWxWMgxzL3mu Lh+GPYb9xXHYdcv10Q6g83JqipcwyRuOvEu8nosPnCl+sgkNd7XgaF+qHBQLIe3Kl+N6PX3Y29F 7ctK2ClR4mnEL3Wnid546GCZUbPi0db73gUDwkXQr2qXCJMSV+uiAW0p38/t7rfxlRjqBJ3gC46 pyJTSnTV4yn6Kf1r098KgvULLt4X/fqypUX9VmhLc5N+0s1+DZT1elWqouGw8cWgFw6wp7OI+yd 48zjY3SWuqxiUeEX6MLog80/xRYlR4vrwuhcS/AVOLlPuctdqLdLfmiFS7fuSs1st/hpgblzOKV R59i8DP5mpBtPr/e7et/aEQRVJHkNKRRr2LbXrWCjDJRYeAZ0BL/XzNFFmHxS11FlOYRohXalr5 okxvJqcV82SZ+zUCLI2bT94ZMbKNJyAyqAmcb97k1ZHmKLF7bmnDa2zGPi0S8CF3gNU2V14ouZE jkeLRlQoq/z/x5QQnsUiwVqDOARSEgm2SMwgWSI9MxSOQ6CSXgqwd9ijktB+nKfe95RZCUv+Gv9 gyZL/oOUNlRt/9lmHBU1D/L4uFLsM95OZNkMguBPKuumTwxzVWJXkRYrtO5soi2XrUn/JlR1cT9 YafQV95l0nVeyiuHsQ35Yt9gBIXLpt0q9zrizttLffsspifrJq7S7AYL7I7J1NVsSNV3FJUdwAS ZmpEQ== Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jul 2017 17:55:26 -0000 This is a multipart message in MIME format. ------=_NextPart_000_0ECB_01D30252.E5CDA5F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Well, personally, if I was designing this, I would not a whole TLV for each bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is supported. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend on what implementations have done already. Adrian From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 To: pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an important decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker to indicate that it can't (or won't) support RSVP-TE as a path setup type. It is entirely plausible that a node might not support RSVP-TE, or else have it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a speaker to declare that they do or don't have support for RSVP-TE paths. There are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support RSVP-TE. If this TLV is omitted, it will be assumed that they do support RSVP-TE. The problem with (1) is that it is not backwards compatible. Any existing SR implementation which also supports RSVP will not currently send this new capability. So, if we make change (1) then forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only do something ugly with a new protocol extension if we simply can't avoid doing it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we made change (1)? Thanks Jon ------=_NextPart_000_0ECB_01D30252.E5CDA5F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Well, personally, if I = was designing this, I would not a whole TLV for each bit = flag!

I would have a = Setup-Type TLV.

If that TLV is absent, = RSVP-TE is supported.

If the TLV is present, = each bit means that a different setup type is = supported.

 

That = means...

Legacy nodes don't = include the TLV and are assumed to support = RSVP-TE

Legacy nodes that = receive the TLV don't know what it means and so object to the Open = (leaving a new node to re-Open for RSVP-TE = only).

New nodes include the = TLV and so indicate explicitly what they = support.

 

I know it is late for = that type of change, so how we proceed might depend on what = implementations have done already.

 

Adrian

 

From: Pce = [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan = Hardwick
Sent: 21 July 2017 16:07
To: pce@ietf.org; = draft-ietf-pce-lsp-setup-type@ietf.org; = draft-ietf-pce-segment-routing@ietf.org
Cc: = pce-chairs@ietf.org
Subject: [Pce] Can we make a non-backwards = compatible change to = draft-ietf-pce-lsp-setup-type?

 

Dear = PCE-ers

 

I don’t want to distract from the SDN topic too = much, but we have an important decision to make about = draft-ietf-pce-lsp-setup-type.

 

The shepherd = review raised an issue that there is no way for a PCEP speaker to = indicate that it can’t (or won’t) support RSVP-TE as a path = setup type.  It is entirely plausible that a node might not support = RSVP-TE, or else have it disabled, for example in an SR-only = network.

 

We think that draft-ietf-pce-lsp-setup-type should be = changed to allow a speaker to declare that they do or don’t have = support for RSVP-TE paths.  There are two = proposals.

 

1.      Change = draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) = RSVP-TE-CAPABILITY TLV in their OPEN object.  If this TLV if = missing, but some other CAPABILITY TLV is present (such as = SR-CAPABILITY) then it means that the speaker does not support RSVP-TE = as a path setup type.

2.      Change = draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) = RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON’T support = RSVP-TE.  If this TLV is omitted, it will be assumed that they do = support RSVP-TE.

 

The problem = with (1) is that it is not backwards compatible.  Any existing SR = implementation which also supports RSVP will not currently send this new = capability.  So, if we make change (1) then forwards-level = implementations will incorrectly conclude that such backwards-level = implementations do not support RSVP-TE.

 

The problem = with (2) is that it is ugly, and in my opinion we should only do = something ugly with a new protocol extension if we simply can’t = avoid doing it.

 

And so the = question: are there any *deployments* of PCEP in a mixed = SR/RSVP-TE environment that would be broken if we made change = (1)?

 

Thanks

Jon

 

------=_NextPart_000_0ECB_01D30252.E5CDA5F0-- From nobody Mon Jul 24 01:15:04 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 62638131C25; Mon, 24 Jul 2017 01:15:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.001 X-Spam-Level: X-Spam-Status: No, score=-2.001 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=metaswitch.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IrqVM2DuRDwF; Mon, 24 Jul 2017 01:15:00 -0700 (PDT) Received: from NAM03-CO1-obe.outbound.protection.outlook.com (mail-co1nam03on0107.outbound.protection.outlook.com [104.47.40.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9ACAE131C20; Mon, 24 Jul 2017 01:15:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=metaswitch.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=NzwgwIOa1XuNpWGYWZzqrFjxPYPAttSGZKHZQ38Fyws=; b=sX21kjUFa1p0llTTqZ97adPInOHn1+hNbL6I5jIPE3EMLOHLHiIPoXWdoe+RIs2mcPkOsEwvd2xOX9aLdhOb4ZhckTuWuYvGsIABqIFJEUyLA38u41HoHzGQ3ViDCetdrdSHHTh3PCiPydofxDUNnJsNBSZHU+yZTfQ4RvrLMEI= Received: from BY2PR0201MB1910.namprd02.prod.outlook.com (10.163.75.152) by BY2PR0201MB1910.namprd02.prod.outlook.com (10.163.75.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1282.10; Mon, 24 Jul 2017 08:14:59 +0000 Received: from BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) by BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) with mapi id 15.01.1282.017; Mon, 24 Jul 2017 08:14:59 +0000 From: Jonathan Hardwick To: "adrian@olddog.co.uk" , "pce@ietf.org" , "draft-ietf-pce-lsp-setup-type@ietf.org" , "draft-ietf-pce-segment-routing@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? 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X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 08:15:02 -0000 --_000_BY2PR0201MB1910A2B2D38697F4830B9DD984BB0BY2PR0201MB1910_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Adrian, The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also conta= ins information about the maximum SID depth. However, I like your idea and= I think that it gives us a better way to do this without breaking backward= s compatibility with existing SR implementations. Suppose we introduce a setup-type TLV into the OPEN object as you propose, = and assign a bit to each setup type. If the TLV is absent, then RSVP-TE is supported. If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE= and SR are supported. This retains backwards compatibility with existing = SR implementations. If the TLV is present, then the bits indicate which setup types are support= ed. We would modify the LSP setup type draft to say that implementations suppor= ting path setup types other than RSVP-TE SHOULD include the setup-type TLV. It's not exactly beautiful, but it's not as ugly as RSVP-TE-NON-SUPPORT. Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 21 July 2017 19:55 To: Jonathan Hardwick ; pce@ietf.org; dra= ft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.or= g Cc: pce-chairs@ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Well, personally, if I was designing this, I would not a whole TLV for each= bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is suppor= ted. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to= the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend o= n what implementations have done already. Adrian From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 To: pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.o= rg; draft-ietf-pce-segment-r= outing@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] Can we make a non-backwards compatible change to draft-ietf-= pce-lsp-setup-type? Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an import= ant decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker= to indicate that it can't (or won't) support RSVP-TE as a path setup type.= It is entirely plausible that a node might not support RSVP-TE, or else h= ave it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a sp= eaker to declare that they do or don't have support for RSVP-TE paths. The= re are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missin= g, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it= means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support = RSVP-TE. If this TLV is omitted, it will be assumed that they do support R= SVP-TE. The problem with (1) is that it is not backwards compatible. Any existing = SR implementation which also supports RSVP will not currently send this new= capability. So, if we make change (1) then forwards-level implementations= will incorrectly conclude that such backwards-level implementations do not= support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only d= o something ugly with a new protocol extension if we simply can't avoid doi= ng it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP= -TE environment that would be broken if we made change (1)? Thanks Jon --_000_BY2PR0201MB1910A2B2D38697F4830B9DD984BB0BY2PR0201MB1910_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Adrian,

 

The SR-PCE-CAPABILITY = TLV is more than just a Boolean value - it also contains information about = the maximum SID depth.  However, I like your idea and I think that it = gives us a better way to do this without breaking backwards compatibility with existing SR implementations.

 

Suppose we introduce a= setup-type TLV into the OPEN object as you propose, and assign a bit to ea= ch setup type.

If the TLV is absent, = then RSVP-TE is supported.

If the TLV is absent a= nd the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR are supported.=   This retains backwards compatibility with existing SR implementation= s.

If the TLV is present,= then the bits indicate which setup types are supported.<= /p>

 

We would modify the LS= P setup type draft to say that implementations supporting path setup types = other than RSVP-TE SHOULD include the setup-type TLV.

 

It’s not exactly= beautiful, but it’s not as ugly as RSVP-TE-NON-SUPPORT.

 

Cheers

Jon<= /p>

 

 

From: Adrian Farrel [mailto:adrian@olddog.co.uk]
Sent: 21 July 2017 19:55
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; pce@= ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-ro= uting@ietf.org
Cc: pce-chairs@ietf.org
Subject: RE: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Well, personally, if I= was designing this, I would not a whole TLV for each bit flag!<= /span>

I would have a Setup-T= ype TLV.

If that TLV is absent,= RSVP-TE is supported.

If the TLV is present,= each bit means that a different setup type is supported.=

 

That means...

Legacy nodes don't inc= lude the TLV and are assumed to support RSVP-TE

Legacy nodes that rece= ive the TLV don't know what it means and so object to the Open (leaving a n= ew node to re-Open for RSVP-TE only).

New nodes include the = TLV and so indicate explicitly what they support.

 

I know it is late for = that type of change, so how we proceed might depend on what implementations= have done already.

 

Adrian

 

From: Pce [mail= to:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: 21 July 2017 16:07
To: pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] Can we make a non-backwards compatible change to draf= t-ietf-pce-lsp-setup-type?

 

Dear PCE-ers

 

I don’t want to distract from the SDN topic to= o much, but we have an important decision to make about draft-ietf-pce-lsp-= setup-type.

 

The shepherd review raised an issue that there is no= way for a PCEP speaker to indicate that it can’t (or won’t) su= pport RSVP-TE as a path setup type.  It is entirely plausible that a n= ode might not support RSVP-TE, or else have it disabled, for example in an SR-only network.

 

We think that draft-ietf-pce-lsp-setup-type should b= e changed to allow a speaker to declare that they do or don’t have su= pport for RSVP-TE paths.  There are two proposals.

 

1. &n= bsp;    Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-CAPABILITY TLV in their OPEN object.  If this TLV if mi= ssing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) the= n it means that the speaker does not support RSVP-TE as a path setup type.

2. &n= bsp;    Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON’T sup= port RSVP-TE.  If this TLV is omitted, it will be assumed that they do= support RSVP-TE.

 

The problem with (1) is that it is not backwards com= patible.  Any existing SR implementation which also supports RSVP will= not currently send this new capability.  So, if we make change (1) th= en forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE.=

 

The problem with (2) is that it is ugly, and in my o= pinion we should only do something ugly with a new protocol extension if we= simply can’t avoid doing it.

 

And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we ma= de change (1)?

 

Thanks

Jon

 

--_000_BY2PR0201MB1910A2B2D38697F4830B9DD984BB0BY2PR0201MB1910_-- From nobody Mon Jul 24 02:11:38 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B2CCB12EC4B for ; Mon, 24 Jul 2017 02:11:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.001 X-Spam-Level: X-Spam-Status: No, score=-2.001 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=hq.sk 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 7TVi71X81DPH for ; Mon, 24 Jul 2017 02:11:35 -0700 (PDT) Received: from mail.hq.sk (hq.sk [81.89.59.181]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DF2E912EACC for ; Mon, 24 Jul 2017 02:11:34 -0700 (PDT) Received: from nitebug.localdomain (46.229.239.158.host.vnet.sk [46.229.239.158]) by mail.hq.sk (Postfix) with ESMTPSA id A0C95243D83; Mon, 24 Jul 2017 11:11:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hq.sk; s=mail; t=1500887491; bh=B84e2+/7BwTjtMdt95DIy+tGVC+GUA4c4agyt6rjWvc=; h=Subject:To:References:From:Date:In-Reply-To; b=Q9VrAolN8/li35ivgMxtbUDAN8zwfSNgrFsO1oVoSt5XoULAH/zERbbUSK6tgl2nT biVBC8QMUB8X218/v1lzkIa00BS/g4MtNVeZwHv/1D/gakCW19MdSzni6e6OghfTz3 eqCDF2cbmPJ9mabdraH57cwx+9AHHXflx/0RIMAU= To: adrian@olddog.co.uk, pce@ietf.org References: <0dbc01d301fb$b2b2d5c0$18188140$@olddog.co.uk> From: Robert Varga Message-ID: Date: Mon, 24 Jul 2017 11:11:23 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <0dbc01d301fb$b2b2d5c0$18188140$@olddog.co.uk> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="CiAwAGrjLl8s8Rnw5QX8cpIbaHjORweuU" Archived-At: Subject: Re: [Pce] Some further thoughts about PCEP and SDN X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 09:11:37 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --CiAwAGrjLl8s8Rnw5QX8cpIbaHjORweuU Content-Type: multipart/mixed; boundary="NbbdPXSGMqEAK4Be62MmClGJ7t2a2MosO"; protected-headers="v1" From: Robert Varga To: adrian@olddog.co.uk, pce@ietf.org Message-ID: Subject: Re: [Pce] Some further thoughts about PCEP and SDN References: <0dbc01d301fb$b2b2d5c0$18188140$@olddog.co.uk> In-Reply-To: <0dbc01d301fb$b2b2d5c0$18188140$@olddog.co.uk> --NbbdPXSGMqEAK4Be62MmClGJ7t2a2MosO Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 21/07/17 10:31, Adrian Farrel wrote: > 5. (Yes, but it is my last point) > There is work proposed to give a NBI to PCE by presenting PCE requests = (i.e., > messages) using Netconf/RESTconf as an RPC with YANG-encoded requests. > This is relevant because it feeds back into the encoding issue. I would like to note that this is implemented and has been shipping in OpenDaylight for a couple of years now. Regards, Robert --NbbdPXSGMqEAK4Be62MmClGJ7t2a2MosO-- --CiAwAGrjLl8s8Rnw5QX8cpIbaHjORweuU Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQI/BAEBCgApFiEEj8CFcGydMnp9J9aFKwPBKqDPANMFAll1ucMLHG5pdGVAaHEu c2sACgkQKwPBKqDPANPTDhAAiSrsHwq4FJxq23drkl4GXcP0BM8ZL9cGbtm2Aicr VdNyjb6nQGkHxquKX1h0ZjiMmkH3lok3z/sO4vi/sehlwbQKMe/zChrYMqTP1QpC zxqCfzp1IcbLtNLCB/GbQF69FQN9cuZ1qMbkig4IxXDBbmPrWZHNOyphbPS1LXv6 lJtpQvbktgOF03rev9NPk7VZCTDKTdo8DwOI51JTvX/+J5xPh7Thr03sidpkSLfI CANiUxPVEa/C74mnflzYLFeXfuZ5W6TdJEAAEUE+fdUQlHZcoQvPT4/05pAODagg YUGaUSU6lkK2VNEMkk2JrZp7EYZXl/LfonX/YLaV3Xtg+HvnExQ4VJlOCzJOonRQ RITTV1c7rOj0U2Wy9YRalncq2lHd7mLs9F64KEbt48ax9qpQwMpbvruVGTqM8yGX ZcKKbgWO60OVfckfdjT7H1k62HI5dUkbv8oVRAVGPZTu6b2rXiU7iMlp+kD13ycl ZthW/u85o2NKjklDMQyn7jM21udI3UsFH7eXtxavRlgFwtnyR4YLeHhz1sbMIVFA mIu3UJdk4IK9pfUpDffl0azNJXeXUoqxXQNfnFqVk2Ju5Dqr3J6WtMHmwimgqdBM cwDSDZ84Edc7p5xE15VwsHEUPms2iTvHvAnRfauULA4oQ90gIGXs/aTjDPFfchGH KyU= =P5JB -----END PGP SIGNATURE----- --CiAwAGrjLl8s8Rnw5QX8cpIbaHjORweuU-- From nobody Mon Jul 24 05:03:00 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BE49F131C76; Mon, 24 Jul 2017 05:02:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.619 X-Spam-Level: X-Spam-Status: No, score=-2.619 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fJhkIMTlaNyD; Mon, 24 Jul 2017 05:02:57 -0700 (PDT) Received: from relais-inet.orange.com (mta239.mail.business.static.orange.com [80.12.66.39]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B217C127ABE; Mon, 24 Jul 2017 05:02:56 -0700 (PDT) Received: from opfedar01.francetelecom.fr (unknown [xx.xx.xx.2]) by opfedar22.francetelecom.fr (ESMTP service) with ESMTP id 36F416078D; Mon, 24 Jul 2017 14:02:55 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.27]) by opfedar01.francetelecom.fr (ESMTP service) with ESMTP id 1894B16007F; Mon, 24 Jul 2017 14:02:55 +0200 (CEST) Received: from OPEXCLILMA4.corporate.adroot.infra.ftgroup ([fe80::65de:2f08:41e6:ebbe]) by OPEXCLILM7C.corporate.adroot.infra.ftgroup ([fe80::8007:17b:c3b4:d68b%19]) with mapi id 14.03.0352.000; Mon, 24 Jul 2017 14:02:54 +0200 From: To: Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgDDd6zg Date: Mon, 24 Jul 2017 12:02:54 +0000 Message-ID: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: multipart/alternative; boundary="_000_9E32478DFA9976438E7A22F69B08FF921EA052B2OPEXCLILMA4corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 12:02:59 -0000 --_000_9E32478DFA9976438E7A22F69B08FF921EA052B2OPEXCLILMA4corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it's just bring a new kind o= f LSP style for this hop by hop path programming. A controller implementing= hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops... The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee :) ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I'm not sure that we need to mimic all features = in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with "limited scale": interesting when all= receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of= receivers need the same information Netconf more generic and point to point ... IMO: do we need PCEP-LS ? =3D> This can be discussed, we already have two protoc= ols to exchange the topology... do we need to add configuration capabilities in PCEP =3D> not sure, we have= Netconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path...) ? Brgds, From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon ___________________________________________________________________________= ______________________________________________ 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_9E32478DFA9976438E7A22F69B08FF921EA052B2OPEXCLILMA4corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,<= /p>

 

As soon as we started = with the active stateful PCE, the PCE became an SDN controller who takes de= cision and programs the network.

So as many already men= tioned, PCEP as an SBI is already done.


IMO, PCECC does not change significantly PCEP, it’s just bring a new = kind of LSP style for this hop by hop path programming. A controller implem= enting hop by hop path programming will require more intelligence as it nee= ds to program nodes in the right order to prevent transient loops…

 

The question is more w= hat is the exact scope of PCEP in term of SBI and do we want to create a pr= otocol that does everything , including coffee J ?

We already have plenty= of protocols: BGP, IGP, Netconf. Each protocol has strength and weaknesses= and I’m not sure that we need to mimic all features in all protocols= . What is the gain here ?

The best approach may = be to use strength of protocols and use them for what they are good for:

Example:

IGP has good flooding = capability with “limited scale”: interesting when all receivers= need the same information

BGP has good flooding = capability with large scale and ability to target specific groups (using ro= ute targets/communities) : interesting when groups of receivers need the sa= me information

Netconf more generic a= nd point to point

…

 

 

IMO:

do we need PCEP-LS ? = =3D> This can be discussed, we already have two protocols to exchange th= e topology…

do we need to add conf= iguration capabilities in PCEP =3D> not sure, we have Netconf for that.<= o:p>

Why not limiting PCEP = to path programming and path policies (traffic steering on path…) ?

 

Brgds,

 

From: Pce [mai= lto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?=

 

Dear PCE WG

 

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

 

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP – capabilities that are tr= aditionally part of routing and signalling.  There were three examples= of this in the PCE working group meeting this week.

·        The PCECC proposal, which extends PCEP’s = path instantiation capability so that the PCE can provision a path end-to-e= nd by touching each hop along the path.  This replaces the function al= ready provided by RSVP-TE.

·        The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.  This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

·        The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.  Again, this replaces functions that = are already designed into the IGPs.

 

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.  PCEP is used to communicate the current network state and to program flows.  These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.  TEAS is very much assuming that this is the directi= on that we want to take PCEP in.  However, there are two procedural issues, as I see it.

1.      We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.  We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the “thin end of the wedge”.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.      We do not currently have a charter that allows = us to add this type of capability to PCEP.  Depending on the outcome o= f discussion (1), we can of course extend the charter.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

 

I am hoping to get more than ju= st “yes” or “no” answers to this question (although= that would be better than no answer).  I would like to hear justifica= tions for or against.  Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational probl= ems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

______________________________________________________________________=
___________________________________________________

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_9E32478DFA9976438E7A22F69B08FF921EA052B2OPEXCLILMA4corp_-- From nobody Mon Jul 24 05:52:48 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BEE0C131A7C; Mon, 24 Jul 2017 05:52:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.221 X-Spam-Level: X-Spam-Status: No, score=-4.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NfCG0T8x6nUI; Mon, 24 Jul 2017 05:52:43 -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 8E2B6127869; Mon, 24 Jul 2017 05:52:42 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DLE96170; Mon, 24 Jul 2017 12:52:40 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.301.0; Mon, 24 Jul 2017 13:52:39 +0100 Received: from SJCEML702-CHM.china.huawei.com ([169.254.4.153]) by SJCEML701-CHM.china.huawei.com ([169.254.3.13]) with mapi id 14.03.0301.000; Mon, 24 Jul 2017 05:52:31 -0700 From: Igor Bryskin To: "stephane.litkowski@orange.com" , Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgDDd6zgAAIgaYA= Date: Mon, 24 Jul 2017 12:52:30 +0000 Message-ID: <0C72C38E7EBC34499E8A9E7DD007863909BB5465@SJCEML702-CHM.china.huawei.com> References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.145.218] Content-Type: multipart/alternative; boundary="_000_0C72C38E7EBC34499E8A9E7DD007863909BB5465SJCEML702CHMchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090206.5975ED99.001B, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.153, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 46445f171ac639844abf3e0684adfa8c Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 12:52:46 -0000 --_000_0C72C38E7EBC34499E8A9E7DD007863909BB5465SJCEML702CHMchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Stephanie, You said: < Why not limiting PCEP to path programming and path policies (traffic stee= ring on path...) ? But why not to use for these purposes RESTCONF or gRPC/protobuffs? Do you s= ee value in using explicit model based SBIs vs implicit (TLV-) based protoc= ols such as PCE? Cheers,, Igor From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@ora= nge.com Sent: Monday, July 24, 2017 8:03 AM To: Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? Hi, As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it's just bring a new kind o= f LSP style for this hop by hop path programming. A controller implementing= hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops... The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee :) ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I'm not sure that we need to mimic all features = in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with "limited scale": interesting when all= receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of= receivers need the same information Netconf more generic and point to point ... IMO: do we need PCEP-LS ? =3D> This can be discussed, we already have two protoc= ols to exchange the topology... do we need to add configuration capabilities in PCEP =3D> not sure, we have= Netconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path...) ? Brgds, From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon ___________________________________________________________________________= ______________________________________________ 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_0C72C38E7EBC34499E8A9E7DD007863909BB5465SJCEML702CHMchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Stephanie,

 

You said:

< Why not limiting PCEP to path programming and path poli= cies (traffic steering on path…) ?

 

But why not to use for= these purposes RESTCONF or gRPC/protobuffs? Do you see value in using expl= icit model based SBIs vs implicit (TLV-) based protocols such as  PCE?=

 

Cheers,,

Igor=

 

 

From: Pce [mai= lto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@orange.com
Sent: Monday, July 24, 2017 8:03 AM
To: Jonathan Hardwick; pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: Re: [Pce] PCEP as an SDN controller protocol?

 

Hi,<= /p>

 

As soon as we started = with the active stateful PCE, the PCE became an SDN controller who takes de= cision and programs the network.

So as many already men= tioned, PCEP as an SBI is already done.


IMO, PCECC does not change significantly PCEP, it’s just bring a new = kind of LSP style for this hop by hop path programming. A controller implem= enting hop by hop path programming will require more intelligence as it nee= ds to program nodes in the right order to prevent transient loops…

 

The question is more w= hat is the exact scope of PCEP in term of SBI and do we want to create a pr= otocol that does everything , including coffee J ?

We already have plenty= of protocols: BGP, IGP, Netconf. Each protocol has strength and weaknesses= and I’m not sure that we need to mimic all features in all protocols= . What is the gain here ?

The best approach may = be to use strength of protocols and use them for what they are good for:

Example:

IGP has good flooding = capability with “limited scale”: interesting when all receivers= need the same information

BGP has good flooding = capability with large scale and ability to target specific groups (using ro= ute targets/communities) : interesting when groups of receivers need the sa= me information

Netconf more generic a= nd point to point

…

 

 

IMO:

do we need PCEP-LS ? = =3D> This can be discussed, we already have two protocols to exchange th= e topology…

do we need to add conf= iguration capabilities in PCEP =3D> not sure, we have Netconf for that.<= o:p>

Why not limiting PCEP = to path programming and path policies (traffic steering on path…) ?

 

Brgds,

 

From: Pce [mai= lto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?=

 

Dear PCE WG

 

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

 

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP – capabilities that are tr= aditionally part of routing and signalling.  There were three examples= of this in the PCE working group meeting this week.

·        The PCECC proposal, which extends PCEP’s = path instantiation capability so that the PCE can provision a path end-to-e= nd by touching each hop along the path.  This replaces the function al= ready provided by RSVP-TE.

·        The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.  This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

·        The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.  Again, this replaces functions that = are already designed into the IGPs.

 

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.  PCEP is used to communicate the current network state and to program flows.  These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.  TEAS is very much assuming that this is the directi= on that we want to take PCEP in.  However, there are two procedural issues, as I see it.

1.      We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.  We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the “thin end of the wedge”.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.      We do not currently have a charter that allows = us to add this type of capability to PCEP.  Depending on the outcome o= f discussion (1), we can of course extend the charter.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

 

I am hoping to get more than ju= st “yes” or “no” answers to this question (although= that would be better than no answer).  I would like to hear justifica= tions for or against.  Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational probl= ems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

______________________________________________________________________=
___________________________________________________
 
Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles 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 messag=
es electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.
 
This message and its attachments may contain confidential or privilege=
d information that may be protected by law;
they should not be distributed, used or copied without authorisation.<=
o:p>
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.
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FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: ericsson.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_AM2PR07MB099490165090E961EBCC3F40F0BB0AM2PR07MB0994eurp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jul 2017 12:54:07.5836 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM2PR07MB0884 X-OriginatorOrg: ericsson.com X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0hTcRTH++0+dietfi3NkynFKCKXrwwcZmUPZFFRmJGGZSuvD3zv+sgS WpmKS8WihYqmhkrMwDRBQwu3MjQUI62smLlchllkkugsRt7dBf73Oef7/Z1zfofDELLHlAeT mJrJalLVyXLahayM7HDzmf2RFeXf9IJSlpQqlM8Ke2jltU+jYuXcEwsVSqoaGmwiVe/7GkJ1 fbKfPk6cdgmJZZMTs1mN355zLgn6nwnpU4vo4kzBJK1FC6NIhyQM4J3QaDdTOuTCyPBzBBPa XmfQh8Bc8Z3gAxKXEjC+UE0Iyh0RGI0PxPx7GZ5AUFl7RYcYhsbBYDUd4T2u+C6C+Ypugs8T 2A9GhtJ5+1rsD3r7pKO1Kw6AfksTLXAwdA92iXgm8Ra4ry8keZbiaOi0GpwTmRG8HRhzCBJc hMBuUPGMsBeUd91zFCWwO3yw1oqEv2Fo6B4iBHaDqQk7JfjPQ0tBp9OzEcyN1ZTAXvC69gbi mwEep+HNw0ZSEI5Cv3aBFITPItBa7M6q3vDuls1ZKRHK2lqdnAS6khnnhk0UGP9KBfaE0rou SijUTkPZfBFZjhRVyyYXOA2myxfJKscK1kB/pZUU8r4wqr9NC6yApvppQmAfqLCbyOX5OiQ2 IDeO5biU+B2Bvqwm8QLHpaX6prKZbWjpoIztf3w6UfP0PhPCDJKvlPZ9yYqSUepsLjfFhIAh 5K5SYuneZNJYde4lVpMWo8lKZjkT2sCQcndp6NNXkTIcr85kk1g2ndX8V0WMxEOLcvJm4uC3 LSc84uXmdT31FR9tB1Qi2bbL1KozXfF6q6Xma57PeJhnYN/2XBV9M+XEt8mxOTa/6IpfviLC Pux78uCvhMNxzdNtA+GWjNnWvZZdZN3wakPLVe36vJEC8aNS87H90Q0TjGTTCnHMqUPVYYG7 B4NyF4oztuaH2IuDOs7KSS5BHeBNaDj1P9aayo9MAwAA Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 12:54:15 -0000 --_000_AM2PR07MB099490165090E961EBCC3F40F0BB0AM2PR07MB0994eurp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Jon for starting this discussion. I agree with Stephane when saying that the decision to turn PCEP into an SD= N protocol was already taken a while ago (with the active PCE IMHO). What are the pros and cons of this approach, let me share some loud thinkin= g: * It could be the SBI solution for those networks where there is no con= trol plane (e.g. many NMS driven optical networks) * It could be a good alternative to Netconf/Restconf as a protocol betw= een sdn controllers (sort of NBI). It's less configuration driven and more = event oriented. It also has different reaction time. * On the other side the market seems to be asking more for Netconf/Rest= conf as the single protocol between SDN controller. We should try to unders= tand if this is driven by the need for a single protocol doing everything, = by the lack of knowledge (of PCEP as a potential SDN protocol), or other re= asons. * It could succeed where open flow failed, being the protocol that oper= ates an heterogeneous network (where there is no control plane interoperabi= lity and provided that readiness is done a priori via NMS). * Should we adopt it just for some of the functionalities Jon listed or= all? Well, for some of them maybe it's not worth it?... All in all I would say I'm leaning towards a yes (to the question in the su= bject). BR Daniele From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@ora= nge.com Sent: luned=EC 24 luglio 2017 14:03 To: Jonathan Hardwick ; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? Hi, As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it's just bring a new kind o= f LSP style for this hop by hop path programming. A controller implementing= hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops... The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee :) ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I'm not sure that we need to mimic all features = in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with "limited scale": interesting when all= receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of= receivers need the same information Netconf more generic and point to point ... IMO: do we need PCEP-LS ? =3D> This can be discussed, we already have two protoc= ols to exchange the topology... do we need to add configuration capabilities in PCEP =3D> not sure, we have= Netconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path...) ? Brgds, From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon ___________________________________________________________________________= ______________________________________________ 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_AM2PR07MB099490165090E961EBCC3F40F0BB0AM2PR07MB0994eurp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Thanks Jon for starting this discussion.

 

I agree with Stephane when saying that the decision to turn PCEP into= an SDN protocol was already taken a while ago (with the active PCE IMHO).<= o:p>

 

What are the pros and cons of this approach, let me share some loud t= hinking:

 

  • It could be= the SBI solution for those networks where there is no control plane (e.g. = many NMS driven optical networks)
  • It could be a good alternative= to Netconf/Restconf as a protocol between sdn controllers (sort of NBI). I= t’s less configuration driven and more event oriented. It also has different reaction time.<= /o:p>
  • On the other side the market seems to be asking more for Netconf/Rest= conf as the single protocol between SDN controller. We should try to understand if this is driven by the need for a single protocol doin= g everything, by the lack of knowledge (of PCEP as a potential SDN protocol= ), or other reasons.
  • It could succeed where open flow failed, be= ing the protocol that operates an heterogeneous network (where there is no = control plane interoperability and provided that readiness is done a priori via NM= S).
  • Should we adopt it just for some of the functionalities Jon = listed or all? Well, for some of them maybe it’s not worth it?...

 

All in all I would say I’m leaning towards a yes (to the questi= on in the subject).

 

BR

Daniele 

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@orange.com
Sent: luned=EC 24 luglio 2017 14:03
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; pce@= ietf.org
Cc: pce-chairs@ietf.org
Subject: Re: [Pce] PCEP as an SDN controller protocol?

 

Hi,

 

As soon as we started with the active stateful PCE, t= he PCE became an SDN controller who takes decision and programs the network= .

So as many already mentioned, PCEP as an SBI is alrea= dy done.


IMO, PCECC does not change significantly PCEP, it’s just bring a new = kind of LSP style for this hop by hop path programming. A controller implem= enting hop by hop path programming will require more intelligence as it nee= ds to program nodes in the right order to prevent transient loops…

 

The question is more what is the exact scope of PCEP = in term of SBI and do we want to create a protocol that does everything , i= ncluding coffee J= ?

We already have plenty of protocols: BGP, IGP, Netcon= f. Each protocol has strength and weaknesses and I’m not sure that we= need to mimic all features in all protocols. What is the gain here ?

The best approach may be to use strength of protocols= and use them for what they are good for:

Example:

IGP has good flooding capability with “limited = scale”: interesting when all receivers need the same information=

BGP has good flooding capability with large scale and= ability to target specific groups (using route targets/communities) : inte= resting when groups of receivers need the same information

Netconf more generic and point to point

…

 

 

IMO:

do we need PCEP-LS ? =3D> This can be discussed, w= e already have two protocols to exchange the topology…

do we need to add configuration capabilities in PCEP = =3D> not sure, we have Netconf for that.

Why not limiting PCEP to path programming and path po= licies (traffic steering on path…) ?

 

Brgds,

 

From:= Pce [mai= lto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol?=

 

De= ar PCE WG

 

Th= e purpose of this email is to initiate a discussion about whether we want t= o extend PCEP to allow it to replace the functions that are traditionally p= rovided by the routing and signalling protocols.

 

Or= iginally, PCEP was designed with the goal of providing a distributed path c= omputation service.  In recent years we have extended that mission, an= d added path modification and path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would= traditionally have been performed by the network management plane.

 

We= are now starting to discuss proposals to add more capabilities to PCEP = 211; capabilities that are traditionally part of routing and signalling.&nb= sp; There were three examples of this in the PCE working group meeting this week.

=B7        The PCECC proposal, which extends PCEP’s = path instantiation capability so that the PCE can provision a path end-to-e= nd by touching each hop along the path.  This replaces the function al= ready provided by RSVP-TE.

=B7        The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.  This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

=B7        The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.  Again, this replaces functions that = are already designed into the IGPs.

 

Th= ese proposals are taking PCEP in the direction of being a fully-fledged SDN= protocol.  With these proposals, one can envision a network in which = there is no traditional control plane.  PCEP is used to communicate the current network state and to program flows.&nbs= p; These proposals have their roots in the ACTN and PCECC architectures tha= t are adopted within the TEAS working group.  TEAS is very much assumi= ng that this is the direction that we want to take PCEP in.  However, there are two procedural issues, as I see = it.

1.    = ;  We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.  We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the “thin end of the wedge”.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.    = ;  We do not currently have a charter that allows = us to add this type of capability to PCEP.  Depending on the outcome o= f discussion (1), we can of course extend the charter.

 

Th= is email is to initiate the discussion (1).  So, please reply to the m= ailing list and share your thoughts on whether PCEP should be extended in t= his direction, and how far we should go.

 

I = am hoping to get more than just “yes” or “no” answe= rs to this question (although that would be better than no answer).  I= would like to hear justifications for or against.  Such as, which production networks would run PCEP in place of a traditional control plane= ?  Why is it not desirable to solve the problems in those networks wit= h the traditional control plane?  What harm could this do?  What = would be the operational problems associated with adding these functions to PCEP?

 

Ma= ny thanks

Jo= n

 

____________________=
___________________________________________________________________________=
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xploites ou copies sans autorisation. Si vous avez recu ce message par erre=
ur, veuillez le signaler
a l'expediteur et le=
 detruire ainsi que les pieces jointes. Les messages electroniques etant su=
sceptibles d'alteration,
Orange decline toute=
 responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
 
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istributed, used or copied without authorisation.
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Thank you.
--_000_AM2PR07MB099490165090E961EBCC3F40F0BB0AM2PR07MB0994eurp_-- From nobody Mon Jul 24 06:10:27 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 70D8C1276AF; Mon, 24 Jul 2017 06:10:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.22 X-Spam-Level: X-Spam-Status: No, score=-4.22 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=ericsson.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cgM47iBMltvo; Mon, 24 Jul 2017 06:10:23 -0700 (PDT) Received: from sessmg22.ericsson.net (sessmg22.ericsson.net [193.180.251.58]) (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 31257131CFA; Mon, 24 Jul 2017 06:10:22 -0700 (PDT) X-AuditID: c1b4fb3a-81bff70000001b2f-2d-5975f1bc6c0f Received: from ESESSHC010.ericsson.se (Unknown_Domain [153.88.183.48]) by sessmg22.ericsson.net (Symantec Mail Security) with SMTP id 39.C5.06959.CB1F5795; Mon, 24 Jul 2017 15:10:20 +0200 (CEST) Received: from EUR02-HE1-obe.outbound.protection.outlook.com (153.88.183.145) by oa.msg.ericsson.com (153.88.183.48) with Microsoft SMTP Server (TLS) id 14.3.352.0; Mon, 24 Jul 2017 15:10:19 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ericsson.onmicrosoft.com; s=selector1-ericsson-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=XJ5qlrytDhdJfD9hwFkickiOphBvc19omczHrqsiZxE=; b=U1tp0T0sywWsN6gkqyb9DhSFalv4QjS8l0bV6tmBPOFIabkrkIllO34dJmzhNmDISW2K4oKFvFBoejpydju/uZiaCpGnxoE6VvBFLh24p24zWpUQzDf4W8/ngVsEuxXFDdY/qUtGKO8r+N6W8j4AEhKvgPrkmp91a4TgvmoNCxM= Received: from AM2PR07MB0994.eurprd07.prod.outlook.com (10.162.37.152) by AM2PR07MB0804.eurprd07.prod.outlook.com (10.161.71.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.1304.10; Mon, 24 Jul 2017 13:10:18 +0000 Received: from AM2PR07MB0994.eurprd07.prod.outlook.com ([fe80::8512:cee5:a76e:ebf7]) by AM2PR07MB0994.eurprd07.prod.outlook.com ([fe80::8512:cee5:a76e:ebf7%13]) with mapi id 15.01.1304.011; Mon, 24 Jul 2017 13:10:18 +0000 From: Daniele Ceccarelli To: Jonathan Hardwick , "adrian@olddog.co.uk" , "pce@ietf.org" , "draft-ietf-pce-lsp-setup-type@ietf.org" , "draft-ietf-pce-segment-routing@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? 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X-Spam-Flag: NO X-Spam-Score: -4.221 X-Spam-Level: X-Spam-Status: No, score=-4.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qBBGKaQ-J3nD; Mon, 24 Jul 2017 07:34:54 -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 D04ED131D33; Mon, 24 Jul 2017 07:34:53 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DRX41640; Mon, 24 Jul 2017 14:34:46 +0000 (GMT) Received: from LHREML505-MBS.china.huawei.com ([169.254.1.2]) by lhreml701-cah.china.huawei.com ([10.201.108.42]) with mapi id 14.03.0301.000; Mon, 24 Jul 2017 15:34:43 +0100 From: Khasanov Boris To: Daniele Ceccarelli , "stephane.litkowski@orange.com" , "Jonathan Hardwick" , "pce@ietf.org" , "adrian@olddog.co.uk" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgDDd6zgAAINdcAAAv3ccA== Date: Mon, 24 Jul 2017 14:34:43 +0000 Message-ID: References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.198.105.166] Content-Type: multipart/alternative; boundary="_000_C7794D4A32C7D046B93DBCF0FA202C182E682379lhreml505mbschi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0201.59760587.0158, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.1.2, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: c19bb4b417adabd1ed9faadf3692e33e Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 14:34:58 -0000 --_000_C7794D4A32C7D046B93DBCF0FA202C182E682379lhreml505mbschi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi all, Firstly as others said - thank you Jon for bringing it up. My 0,05$: 1) I also do agree with Daniele, Stephane, Adrian and others that PCEP= as SBI is a fact. 2) Can PCEP be extended to some new directions? IMO - yes, why not. Su= rely we have different protocols that my look overlapping (or competing som= etimes), they have own pros and cons. I think we should provide different = options, there should be no monopoly with just one or two protocols. Stepha= ne mentioned IGP vs. BGP example. Just for illustration, I would like to re= mind that currently in some big DCs BGP (eBGP) is used as routing protocol = instead of IGP, although some time ago it would be a very strange decision. 3) So we do not have a crystal ball and we cannot say which protocol w= ill or can prevail even in mid-term perspective. Only time will show that. = Thus I do support our efforts for PCEP development. Thank you. SY, Boris From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Daniele Ceccarelli Sent: Monday, July 24, 2017 3:54 PM To: stephane.litkowski@orange.com; Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? Thanks Jon for starting this discussion. I agree with Stephane when saying that the decision to turn PCEP into an SD= N protocol was already taken a while ago (with the active PCE IMHO). What are the pros and cons of this approach, let me share some loud thinkin= g: * It could be the SBI solution for those networks where there is no con= trol plane (e.g. many NMS driven optical networks) * It could be a good alternative to Netconf/Restconf as a protocol betw= een sdn controllers (sort of NBI). It's less configuration driven and more = event oriented. It also has different reaction time. * On the other side the market seems to be asking more for Netconf/Rest= conf as the single protocol between SDN controller. We should try to unders= tand if this is driven by the need for a single protocol doing everything, = by the lack of knowledge (of PCEP as a potential SDN protocol), or other re= asons. * It could succeed where open flow failed, being the protocol that oper= ates an heterogeneous network (where there is no control plane interoperabi= lity and provided that readiness is done a priori via NMS). * Should we adopt it just for some of the functionalities Jon listed or= all? Well, for some of them maybe it's not worth it?... All in all I would say I'm leaning towards a yes (to the question in the su= bject). BR Daniele From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@ora= nge.com Sent: luned=EC 24 luglio 2017 14:03 To: Jonathan Hardwick >; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? Hi, As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it's just bring a new kind o= f LSP style for this hop by hop path programming. A controller implementing= hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops... The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee :) ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I'm not sure that we need to mimic all features = in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with "limited scale": interesting when all= receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of= receivers need the same information Netconf more generic and point to point ... IMO: do we need PCEP-LS ? =3D> This can be discussed, we already have two protoc= ols to exchange the topology... do we need to add configuration capabilities in PCEP =3D> not sure, we have= Netconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path...) ? Brgds, From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon ___________________________________________________________________________= ______________________________________________ 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_C7794D4A32C7D046B93DBCF0FA202C182E682379lhreml505mbschi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi all,=

Firstly= as others said – thank you Jon for bringing it up.=

&n= bsp;

My 0,05= $:

= 1)      I also do agree with Daniele, Stephane, Adrian and others that PCEP as SBI= is a fact.

= 2)      Can PCEP be extended to some new directions? IMO - yes, why not. Surely we= have different protocols that my look overlapping (or competing sometimes)= , they have own pros and cons.  I think we should provide different options, there should be no monopoly with just= one or two protocols. Stephane mentioned IGP vs. BGP example. Just for ill= ustration, I would like to remind that currently in some big DCs BGP (eBGP)= is used as routing protocol instead of IGP, although some time ago it would be a very strange decision. <= /o:p>

= 3)      So we do not have a crystal ball and we cannot say which protocol will or = can prevail even in mid-term perspective. Only time will show that. Thus I = do support our efforts for PCEP development.

&n= bsp;

Thank y= ou.

&n= bsp;

SY,

Boris

&n= bsp;

&n= bsp;

&n= bsp;

&n= bsp;

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Daniele Ceccarelli
Sent: Monday, July 24, 2017 3:54 PM
To: stephane.litkowski@orange.com; Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org
Subject: Re: [Pce] PCEP as an SDN controller protocol?

 

Thanks Jon for starting this di= scussion.

 

I agree with Stephane when sayi= ng that the decision to turn PCEP into an SDN protocol was already taken a = while ago (with the active PCE IMHO).

 

What are the pros and cons of t= his approach, let me share some loud thinking:

 

  • It could be the SBI solution for those networks where there is no contr= ol plane (e.g. many NMS driven optical networks)
  • = It could be a good alternative to Netconf/Restconf as a protocol between sd= n controllers (sort of NBI). It’s less configuration driven and more = event oriented. It also has different reaction time.
  • On the other side the market seems to be a= sking more for Netconf/Restconf as the single protocol between SDN controll= er. We should try to understand if this is driven by the need for a single protocol doing everything, by the lack of knowledge (of PCEP as a p= otential SDN protocol), or other reasons.
  • It co= uld succeed where open flow failed, being the protocol that operates an het= erogeneous network (where there is no control plane interoperability and pr= ovided that readiness is done a priori via NMS).
  • Should we adopt it just for s= ome of the functionalities Jon listed or all? Well, for some of them maybe = it’s not worth it?...

 

All in all I would say I’= m leaning towards a yes (to the question in the subject).=

 

BR

Daniele 

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stepha= ne.litkowski@orange.com
Sent: luned=EC 24 luglio 2017 14:03
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; pce@ietf.org
Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol?

=  

Hi,

 

As soon as we started with the active stateful PCE, t= he PCE became an SDN controller who takes decision and programs the network= .

So as many already mentioned, PCEP as an SBI is alrea= dy done.


IMO, PCECC does not change significantly PCEP, it’s just bring a new = kind of LSP style for this hop by hop path programming. A controller implem= enting hop by hop path programming will require more intelligence as it nee= ds to program nodes in the right order to prevent transient loops…

 

The question is more what is the exact scope of PCEP = in term of SBI and do we want to create a protocol that does everything , i= ncluding coffee J= ?

We already have plenty of protocols: BGP, IGP, Netcon= f. Each protocol has strength and weaknesses and I’m not sure that we= need to mimic all features in all protocols. What is the gain here ?

The best approach may be to use strength of protocols= and use them for what they are good for:

Example:

IGP has good flooding capability with “limited = scale”: interesting when all receivers need the same information=

BGP has good flooding capability with large scale and= ability to target specific groups (using route targets/communities) : inte= resting when groups of receivers need the same information

Netconf more generic and point to point

…

 

 

IMO:

do we need PCEP-LS ? =3D> This can be discussed, w= e already have two protocols to exchange the topology…

do we need to add configuration capabilities in PCEP = =3D> not sure, we have Netconf for that.

Why not limiting PCEP to path programming and path po= licies (traffic steering on path…) ?

 

Brgds,

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol?=

 

De= ar PCE WG

 

Th= e purpose of this email is to initiate a discussion about whether we want t= o extend PCEP to allow it to replace the functions that are traditionally p= rovided by the routing and signalling protocols.

 

Or= iginally, PCEP was designed with the goal of providing a distributed path c= omputation service.  In recent years we have extended that mission, an= d added path modification and path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would= traditionally have been performed by the network management plane.

 

We= are now starting to discuss proposals to add more capabilities to PCEP = 211; capabilities that are traditionally part of routing and signalling.&nb= sp; There were three examples of this in the PCE working group meeting this week.

=B7        The PCECC proposal, which extends PCEP’s = path instantiation capability so that the PCE can provision a path end-to-e= nd by touching each hop along the path.  This replaces the function al= ready provided by RSVP-TE.

=B7        The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.  This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

=B7        The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.  Again, this replaces functions that = are already designed into the IGPs.

 

Th= ese proposals are taking PCEP in the direction of being a fully-fledged SDN= protocol.  With these proposals, one can envision a network in which = there is no traditional control plane.  PCEP is used to communicate the current network state and to program flows.&nbs= p; These proposals have their roots in the ACTN and PCECC architectures tha= t are adopted within the TEAS working group.  TEAS is very much assumi= ng that this is the direction that we want to take PCEP in.  However, there are two procedural issues, as I see = it.

1.  = ;    We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.  We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the “thin end of the wedge”.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.  = ;    We do not currently have a charter that allows = us to add this type of capability to PCEP.  Depending on the outcome o= f discussion (1), we can of course extend the charter.

 

Th= is email is to initiate the discussion (1).  So, please reply to the m= ailing list and share your thoughts on whether PCEP should be extended in t= his direction, and how far we should go.

 

I = am hoping to get more than just “yes” or “no” answe= rs to this question (although that would be better than no answer).  I= would like to hear justifications for or against.  Such as, which production networks would run PCEP in place of a traditional control plane= ?  Why is it not desirable to solve the problems in those networks wit= h the traditional control plane?  What harm could this do?  What = would be the operational problems associated with adding these functions to PCEP?

 

Ma= ny thanks

Jo= n

 

____________________=
___________________________________________________________________________=
__________________________
 
Ce message et ses pi=
eces jointes peuvent contenir des informations confidentielles ou privilegi=
ees et ne doivent donc
pas etre diffuses, e=
xploites ou copies sans autorisation. Si vous avez recu ce message par erre=
ur, veuillez le signaler
a l'expediteur et le=
 detruire ainsi que les pieces jointes. Les messages electroniques etant su=
sceptibles d'alteration,
Orange decline toute=
 responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
 
This message and its=
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they should not be d=
istributed, used or copied without authorisation.
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ered, Orange is not liable for messages that have been modified, changed or=
 falsified.
Thank you.
--_000_C7794D4A32C7D046B93DBCF0FA202C182E682379lhreml505mbschi_-- From nobody Mon Jul 24 11:50:50 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D39E3131CEB; Mon, 24 Jul 2017 11:50:48 -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 autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WfK9YiGlQk7u; Mon, 24 Jul 2017 11:50:46 -0700 (PDT) Received: from asmtp2.iomartmail.com (asmtp2.iomartmail.com [62.128.201.249]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 62941129B53; Mon, 24 Jul 2017 11:50:44 -0700 (PDT) Received: from asmtp2.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp2.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6OIogOd006615; Mon, 24 Jul 2017 19:50:42 +0100 Received: from 950129200 ([31.121.117.6]) (authenticated bits=0) by asmtp2.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6OIobVw006566 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 24 Jul 2017 19:50:39 +0100 Reply-To: From: "Adrian Farrel" To: "'Jonathan Hardwick'" , , , Cc: References: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> In-Reply-To: Date: Mon, 24 Jul 2017 19:50:36 +0100 Message-ID: <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_114E_01D304B6.210549B0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQFCsVj2MV66vwevRzfpEXYXn4SlsgLb6Lt6AoGNBjGjWQwt8A== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23216.001 X-TM-AS-Result: No--17.583-10.0-31-10 X-imss-scan-details: No--17.583-10.0-31-10 X-TMASE-MatchedRID: yebcs53SkkAcYHsGkuuPpUKcYi5Qw/RVUAjrAJWsTe+HlDUCu0I+XO/J p4NV6pXfsVRFSc9P2mg/EjEu7SMNHLOiL0s7BZOX2os3ueKAsFQZskwWqoib3P0TP/kikeqnz5z AIum8OcSEsugwh5/A5uF7LmH5ntYoeyTmKMeU9A0JaI5LQFWiSN9QcAT2BP/gnWBUWlAKnBNRla Q7m7aP9dtHzjZ9n3jTL4IGjd2gTSMWbYe4BlWB9kfhraIl1XgxvdPf2rGet4kwp/4s3hUlGAN1u p/aduX07zmTAjNgxKVU+6S8khnj9M4sYPkW/sedJ966z7+35Sk3GofkGVB3jpzYFsVjIMcy95ri 4fhj2G/cVx2HXL9dEOoPNyaoqXMMkbjrxLvJ6LD5wpfrIJDXe14GhfqhwUCyHtypfjej192NvRe 3LStgpUeJpxC91p4neeOhgmVGz4tHW+94FA8JF0K9qlwiTElfrogFtKd/P7e638ZUY6gSd4AuOq ciU0p01eMp+in9a9PfCoL1Cy7eF2c/On6gI+zzlwOGeK/WrXNT4DtiSkMnWCgMxnfFXjiIdXDbH Fxm2F+dv7RrSohAJCkm8kuls98/aEoHA+Yew8W7vYqkCS0dL7YidXoBo/qVlSFPfwjN9pHsoEFn ZAFTLE+J83GmsfZy66Wuu9SwKD+HFo7dvDc+MOOtrJejSjcwh+w9Wz/xXDoR8rMICe0qkPMxs+u cp3ZMyS4a/w19Mu+jsy4IyYQvCIGSNZ+mjVM23/BiYwVwlIiQF91MxEBdRrXvDHySC+eUlSBIvH 74wfJrar1QOTCmjzl5+IQAcYVk8lEDYmoBkrOeAiCmPx4NwGmRqNBHmBvevqq8s2MNhPB9j2Gwz TE3vXkguuQorcgMG8PJxfb8FIrf7GQoX/bBTzpgsEHNtRAmc7EA9v5KvZ1+3BndfXUhXQ== Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 18:50:49 -0000 This is a multipart message in MIME format. ------=_NextPart_000_114E_01D304B6.210549B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Yes to that, Jon. But what happens when the next thing comes along? Since sub-TLVs can be present, I would suggest to use a Setup-Type TLV with a bit map as I previously described in my email, and add optional sub-TLVs dependent on the bits that are set. Isn't that the best of both worlds? Adrian From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitch.com] Sent: 24 July 2017 09:15 To: adrian@olddog.co.uk; pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Cc: pce-chairs@ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Adrian, The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also contains information about the maximum SID depth. However, I like your idea and I think that it gives us a better way to do this without breaking backwards compatibility with existing SR implementations. Suppose we introduce a setup-type TLV into the OPEN object as you propose, and assign a bit to each setup type. If the TLV is absent, then RSVP-TE is supported. If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR are supported. This retains backwards compatibility with existing SR implementations. If the TLV is present, then the bits indicate which setup types are supported. We would modify the LSP setup type draft to say that implementations supporting path setup types other than RSVP-TE SHOULD include the setup-type TLV. It's not exactly beautiful, but it's not as ugly as RSVP-TE-NON-SUPPORT. Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 21 July 2017 19:55 To: Jonathan Hardwick ; pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Cc: pce-chairs@ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Well, personally, if I was designing this, I would not a whole TLV for each bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is supported. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend on what implementations have done already. Adrian From: Pce [ mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 To: pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an important decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker to indicate that it can't (or won't) support RSVP-TE as a path setup type. It is entirely plausible that a node might not support RSVP-TE, or else have it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a speaker to declare that they do or don't have support for RSVP-TE paths. There are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support RSVP-TE. If this TLV is omitted, it will be assumed that they do support RSVP-TE. The problem with (1) is that it is not backwards compatible. Any existing SR implementation which also supports RSVP will not currently send this new capability. So, if we make change (1) then forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only do something ugly with a new protocol extension if we simply can't avoid doing it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we made change (1)? Thanks Jon ------=_NextPart_000_114E_01D304B6.210549B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Yes to that, Jon. But = what happens when the next thing comes along?

 

Since sub-TLVs can be = present, I would suggest to use a Setup-Type TLV with a bit map as I = previously described in my email, and add optional sub-TLVs dependent on = the bits that are set.

 

Isn't that the best of = both worlds?

 

Adrian

 

From: Jonathan = Hardwick [mailto:Jonathan.Hardwick@metaswitch.com]
Sent: 24 = July 2017 09:15
To: adrian@olddog.co.uk; pce@ietf.org; = draft-ietf-pce-lsp-setup-type@ietf.org; = draft-ietf-pce-segment-routing@ietf.org
Cc: = pce-chairs@ietf.org
Subject: RE: [Pce] Can we make a = non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Adrian,

 

The SR-PCE-CAPABILITY = TLV is more than just a Boolean value - it also contains information = about the maximum SID depth.  However, I like your idea and I think = that it gives us a better way to do this without breaking backwards = compatibility with existing SR implementations.

 

Suppose we introduce a = setup-type TLV into the OPEN object as you propose, and assign a bit to = each setup type.

If the TLV is absent, then RSVP-TE is = supported.

If the TLV is absent and the SR-PCE-CAPABILITY = TLV is present, then RSVP-TE and SR are supported.  This retains = backwards compatibility with existing SR = implementations.

If the TLV is present, then the bits indicate = which setup types are supported.

 

We would modify the LSP = setup type draft to say that implementations supporting path setup types = other than RSVP-TE SHOULD include the setup-type = TLV.

 

It’s not exactly = beautiful, but it’s not as ugly as = RSVP-TE-NON-SUPPORT.

 

Cheers

Jon

 

 

From:= Adrian = Farrel [mailto:adrian@olddog.co.uk]
Sent: 21 July 2017 = 19:55
To: Jonathan Hardwick = <Jonathan.Hardwick@metaswitch.com>; pce@ietf.org; = draft-ietf-pce-lsp-setup-type@ietf.org; = draft-ietf-pce-segment-routing@ietf.org
Cc: = pce-chairs@ietf.org
Subject: RE: [Pce] Can we make a = non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Well, personally, if I was designing this, I = would not a whole TLV for each bit flag!

I would have a = Setup-Type TLV.

If that TLV is absent, RSVP-TE is = supported.

If the TLV is present, each bit means that a = different setup type is supported.

 

That = means...

Legacy nodes don't include the TLV and are = assumed to support RSVP-TE

Legacy nodes that = receive the TLV don't know what it means and so object to the Open = (leaving a new node to re-Open for RSVP-TE = only).

New nodes include the TLV and so indicate = explicitly what they support.

 

I know it is late for = that type of change, so how we proceed might depend on what = implementations have done already.

 

Adrian

 

From: Pce [mailto:pce-bounces@ietf.org= ] On Behalf Of Jonathan = Hardwick
Sent: 21 July 2017 16:07
To: pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf= .org; draft-ietf-pce-segment-routing@iet= f.org
Cc: pce-chairs@ietf.org
Subject: [Pce] Can we = make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Dear = PCE-ers

 

I don’t want to distract from the SDN topic too = much, but we have an important decision to make about = draft-ietf-pce-lsp-setup-type.

 

The shepherd = review raised an issue that there is no way for a PCEP speaker to = indicate that it can’t (or won’t) support RSVP-TE as a path = setup type.  It is entirely plausible that a node might not support = RSVP-TE, or else have it disabled, for example in an SR-only = network.

 

We think that draft-ietf-pce-lsp-setup-type should be = changed to allow a speaker to declare that they do or don’t have = support for RSVP-TE paths.  There are two = proposals.

 

1.      Change = draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) = RSVP-TE-CAPABILITY TLV in their OPEN object.  If this TLV if = missing, but some other CAPABILITY TLV is present (such as = SR-CAPABILITY) then it means that the speaker does not support RSVP-TE = as a path setup type.

2.      Change = draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) = RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON’T support = RSVP-TE.  If this TLV is omitted, it will be assumed that they do = support RSVP-TE.

 

The problem = with (1) is that it is not backwards compatible.  Any existing SR = implementation which also supports RSVP will not currently send this new = capability.  So, if we make change (1) then forwards-level = implementations will incorrectly conclude that such backwards-level = implementations do not support RSVP-TE.

 

The problem = with (2) is that it is ugly, and in my opinion we should only do = something ugly with a new protocol extension if we simply can’t = avoid doing it.

 

And so the = question: are there any *deployments* of PCEP in a mixed = SR/RSVP-TE environment that would be broken if we made change = (1)?

 

Thanks

Jon

 

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[107.1.141.74]) by smtp.gmail.com with ESMTPSA id a82sm19913385pfc.120.2017.07.24.15.12.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Jul 2017 15:12:29 -0700 (PDT) User-Agent: Microsoft-MacOutlook/f.24.0.170702 Date: Tue, 25 Jul 2017 00:12:28 +0200 From: Jeff Tantsura To: Igor Bryskin , "stephane.litkowski@orange.com" , Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Message-ID: <62EE87B8-AF9A-4155-A2BD-11495D9A3996@gmail.com> Thread-Topic: [Pce] PCEP as an SDN controller protocol? Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3583786349_733651093" Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Jul 2017 22:12:34 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3583786349_733651093 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable We all know =E2=80=93 every protocol has its strong and less strong sides, howeve= r the properties required for a distributed device2device communication are = quite different from device2controller environment and should be evaluated a= s such. There=E2=80=99s a long list of pros and cons for either environments (objective f= unctions) as well operational preferences, domain knowledge, and such =20 Most of us here are biased =E2=98=BA=20 To put it short =E2=80=93 I believe there=E2=80=99s enough people who are interested in= working on PCEP to extend it, personally I see value in having PCEP next to= any other SBI=E2=80=99s mentioned below, however what I don=E2=80=99t want, is to overl= oad semantics of PCEP (aka BGP kitchen sink =E2=98=BA). =20 Cheers, Jeff =20 From: Pce on behalf of Igor Bryskin Date: Monday, July 24, 2017 at 14:52 To: "stephane.litkowski@orange.com" , Jonath= an Hardwick , "pce@ietf.org" Cc: "pce-chairs@ietf.org" Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 Hi Stephanie, =20 You said: < Why not limiting PCEP to path programming and path policies (traffic stee= ring on path=E2=80=A6) ? =20 But why not to use for these purposes RESTCONF or gRPC/protobuffs? Do you s= ee value in using explicit model based SBIs vs implicit (TLV-) based protoco= ls such as PCE? =20 Cheers,, Igor =20 =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@ora= nge.com Sent: Monday, July 24, 2017 8:03 AM To: Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 Hi, =20 As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it=E2=80=99s just bring a new kind= of LSP style for this hop by hop path programming. A controller implementin= g hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops=E2=80=A6 =20 The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee J ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I=E2=80=99m not sure that we need to mimic all features= in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with =E2=80=9Climited scale=E2=80=9D: interesting when= all receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of = receivers need the same information Netconf more generic and point to point =E2=80=A6 =20 =20 IMO:=20 do we need PCEP-LS ? =3D> This can be discussed, we already have two protocol= s to exchange the topology=E2=80=A6=20 do we need to add configuration capabilities in PCEP =3D> not sure, we have N= etconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path=E2=80=A6) ? =20 Brgds, =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? =20 Dear PCE WG =20 The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally = provided by the routing and signalling protocols. =20 Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and ad= ded path modification and path instantiation capabilities to PCEP. This has= added capabilities to PCEP that would traditionally have been performed by = the network management plane. =20 We are now starting to discuss proposals to add more capabilities to PCEP =E2= =80=93 capabilities that are traditionally part of routing and signalling. Ther= e were three examples of this in the PCE working group meeting this week. =C2=B7 The PCECC proposal, which extends PCEP=E2=80=99s path instantiation cap= ability so that the PCE can provision a path end-to-end by touching each hop= along the path. This replaces the function already provided by RSVP-TE. =C2=B7 The PCEP-LS proposal, which extends PCEP to allow link state and = TE information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. =C2=B7 The PCECC-SR proposal extends PCEP to allow device-level configur= ation to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed into= the IGPs. =20 These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which ther= e is no traditional control plane. PCEP is used to communicate the current = network state and to program flows. These proposals have their roots in the= ACTN and PCECC architectures that are adopted within the TEAS working group= . TEAS is very much assuming that this is the direction that we want to tak= e PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates on= specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cthin end of = the wedge=E2=80=9D. If we start down this path then we are accepting that PCEP wi= ll replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that = direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can o= f course extend the charter. =20 This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this = direction, and how far we should go. =20 I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this que= stion (although that would be better than no answer). I would like to hear = justifications for or against. Such as, which production networks would run= PCEP in place of a traditional control plane? Why is it not desirable to s= olve the problems in those networks with the traditional control plane? Wha= t harm could this do? What would be the operational problems associated wit= h adding these functions to PCEP? =20 Many thanks Jon =20 ___________________________________________________________________________= ______________________________________________ =20 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. =20 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. _______________________________________________ Pce mailing list Pce@ietf.o= rg https://www.ietf.org/mailman/listinfo/pce=20 --B_3583786349_733651093 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

We all know =E2=80=93 every protocol has its strong and less strong sides, howe= ver the properties required for a distributed device2device communication ar= e quite different from device2controller environment and should be evaluated= as such.

There=E2=80=99s a long list of pros and cons for either environments (objecti= ve functions) as well operational preferences, domain knowledge, and such

&n= bsp;

Most = of us here are biased =E2=98=BA =

To put it short =E2=80=93 I = believe there=E2=80=99s enough people who are interested in working on PCEP to ext= end it, personally I see value in having PCEP next to any other SBI=E2=80=99s ment= ioned below, however what I don=E2=80=99t want, is to overload semantics of PCEP (= aka BGP kitchen sink =E2=98=BA).=

 

Che= ers,

Jeff

 

From: Pce <pce-bounces@ietf.org> on behalf of Igor Bryskin <I= gor.Bryskin@huawei.com>
Date: Monday, July 24, 2017 at 14:52To: "stephane.litkowski@orange.com" <stephane.litkowski= @orange.com>, Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>,= "pce@ietf.org" <pce@ietf.org>
Cc: "pce-chair= s@ietf.org" <pce-chairs@ietf.org>
Subject: Re: [Pce] PC= EP as an SDN controller protocol?

 

Hi Stephanie,

 

You said:

< Why not = limiting PCEP to path programming and path policies (traffic steering on pat= h=E2=80=A6) ?

 

But why not to use for thes= e purposes RESTCONF or gRPC/protobuffs? Do you see value in using explicit m= odel based SBIs vs implicit (TLV-) based protocols such as  PCE?=

 

Cheers,,

Igor

 

 

From: Pce [mailto:pce-bounces@ietf.org] On Beha= lf Of stephane.litkowski@orange.com
Sent: Monday, July 24, 201= 7 8:03 AM
To: Jonathan Hardwick; pce@ietf.org
Cc: pce-ch= airs@ietf.org
Subject: Re: [Pce] PCEP as an SDN controller protoco= l?

 

Hi,

 

As soon as= we started with the active stateful PCE, the PCE became an SDN controller w= ho takes decision and programs the network.

So as many alre= ady mentioned, PCEP as an SBI is already done.


IMO, PCE= CC does not change significantly PCEP, it=E2=80=99s just bring a new kind of LSP s= tyle for this hop by hop path programming. A controller implementing hop by = hop path programming will require more intelligence as it needs to program n= odes in the right order to prevent transient loops=E2=80=A6

<= p class=3DMsoNormal style=3D'margin-left:.5in'> = ;

The question is more what is the exact scope of PCEP in t= erm of SBI and do we want to create a protocol that does everything , includ= ing coffee J= ?

We already have plenty of pr= otocols: BGP, IGP, Netconf. Each protocol has strength and weaknesses and I=E2= =80=99m not sure that we need to mimic all features in all protocols. What is th= e gain here ?

The best approach may be to use strength of p= rotocols and use them for what they are good for:

Example:<= /span>

IGP has good flooding capability with =E2=80=9Climited scale=E2=80=9D: = interesting when all receivers need the same information

BG= P has good flooding capability with large scale and ability to target specif= ic groups (using route targets/communities) : interesting when groups of rec= eivers need the same information

Netconf more generic and p= oint to point

=E2=80=A6

 =

=  

IMO:

do we need PCEP-LS ? =3D> Th= is can be discussed, we already have two protocols to exchange the topology=E2= =80=A6

do we need to add configuration capabilities in PCEP =3D&= gt; not sure, we have Netconf for that.

Why not limiting PC= EP to path programming and path policies (traffic steering on path=E2=80=A6) ?

 

Brgds,

 <= o:p>

From:<= span style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'> Pce [mailto:p= ce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: T= hursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-ch= airs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?

=  

Dear PCE WG

 

The purpose of this email is to initiat= e a discussion about whether we want to extend PCEP to allow it to replace t= he functions that are traditionally provided by the routing and signalling p= rotocols.

<= span lang=3DEN-GB> 

Originally, PCEP was designed with the goal of = providing a distributed path computation service.  In recent years we h= ave extended that mission, and added path modification and path instantiatio= n capabilities to PCEP.  This has added capabilities to PCEP that would= traditionally have been performed by the network management plane.

&n= bsp;

We are now starting to discuss proposals to add more capabilities= to PCEP =E2=80=93 capabilities that are traditionally part of routing and signall= ing.  There were three examples of this in the PCE working group meetin= g this week.

=C2=B7<= /span>        Th= e PCECC proposal, which extends PCEP=E2=80=99s path instantiation capability so th= at the PCE can provision a path end-to-end by touching each hop along the pa= th.  This replaces the function already provided by RSVP-TE.

=C2=B7  &nbs= p;     The PCEP-LS proposal, whi= ch extends PCEP to allow link state and TE information to be communicated fr= om the network to the PCE.  This replaces the link state flooding funct= ion provided by the IGPs, or BGP-LS.

=C2=B7        The PCECC-SR proposal extends PCEP to allow device-lev= el configuration to be communicated between the network and the PCE, such as= SRGBs, prefix SIDs etc.  Again, this replaces functions that are alrea= dy designed into the IGPs.

 

These proposals are taking PCE= P in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contro= l plane.  PCEP is used to communicate the current network state and to = program flows.  These proposals have their roots in the ACTN and PCECC = architectures that are adopted within the TEAS working group.  TEAS is = very much assuming that this is the direction that we want to take PCEP in.&= nbsp; However, there are two procedural issues, as I see it.

1.      We have not had an explicit discussion in the PCE WG about whether we= want to take PCEP in this direction.  We have had a few lively debates= on specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cthin end = of the wedge=E2=80=9D.  If we start down this path then we are accepting that= PCEP will replace the functions available in the traditional control plane.=   We need to test whether there is a consensus in the working group to = move in that direction.

2. &nb= sp;    We do not currently have a cha= rter that allows us to add this type of capability to PCEP.  Depending = on the outcome of discussion (1), we can of course extend the charter.

 

This email is to initiate the discussion (1).  So, please= reply to the mailing list and share your thoughts on whether PCEP should be= extended in this direction, and how far we should go.

=

 

I = am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this questi= on (although that would be better than no answer).  I would like to hea= r justifications for or against.  Such as, which production networks wo= uld run PCEP in place of a traditional control plane?  Why is it not de= sirable to solve the problems in those networks with the traditional control= plane?  What harm could this do?  What would be the operational p= roblems associated with adding these functions to PCEP?

 <= o:p>

M= any thanks

= Jon

 

___________________________________________________________________=
______________________________________________________
 
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--B_3583786349_733651093-- From nobody Mon Jul 24 18:58:19 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 797A3129AD2; Mon, 24 Jul 2017 18:58:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.22 X-Spam-Level: X-Spam-Status: No, score=-4.22 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QO9NydmtIunX; Mon, 24 Jul 2017 18:58:14 -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 00D991201F8; Mon, 24 Jul 2017 18:58:12 -0700 (PDT) Received: from 172.18.7.190 (EHLO LHREML710-CAH.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DLF78580; Tue, 25 Jul 2017 01:58:10 +0000 (GMT) Received: from DGGEML401-HUB.china.huawei.com (10.3.17.32) by LHREML710-CAH.china.huawei.com (10.201.108.33) with Microsoft SMTP Server (TLS) id 14.3.301.0; Tue, 25 Jul 2017 02:58:09 +0100 Received: from DGGEML503-MBX.china.huawei.com ([169.254.9.230]) by DGGEML401-HUB.china.huawei.com ([fe80::89ed:853e:30a9:2a79%31]) with mapi id 14.03.0301.000; Tue, 25 Jul 2017 09:58:04 +0800 From: Zhenghaomian To: Daniele Ceccarelli , "stephane.litkowski@orange.com" , "Jonathan Hardwick" , "pce@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgDDd6zgAAINdcAAGvzUQA== Date: Tue, 25 Jul 2017 01:58:03 +0000 Message-ID: References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.57.78.212] Content-Type: multipart/alternative; boundary="_000_E0C26CAA2504C84093A49B2CAC3261A43A29E5F5DGGEML503MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090202.5976A5B3.0030, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.9.230, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 929aebe423df976318b3e698a26fcd1f Archived-At: Subject: [Pce] =?gb2312?b?tPC4tDogUENFUCBhcyBhbiBTRE4gY29udHJvbGxlciBwcm90?= =?gb2312?b?b2NvbD8=?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: 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Thanks Jon for bringing this topic, it is already a fact that peo= ple are implementing PCEP with their controllers, as many other experts men= tioned in previous email.

 

The point I would like to raise is how to deal with PCEP with oth= er protocols. Currently it seems that there is some competition with BGP in= link state (both binary but Optical/MW CANNOT run BGP), and also with Netconf/RESTconf on device configuration (w= ell they are text). If we consider PCEP-LS work only, we should consider it= at least for optical/MW binary solution. I believe that the direction we a= re promoting is correct for PCEP, i.e., make PCEP applicable in necessary network environments, rather than = pure =A1=AEpath computation methodology=A1=AF.

 

Moreover, instead of PCEP-LS outcome,  I am more interested = in the principle behind, i.e., are we trying to construct PCEP as a fully o= verlapping with any other protocol, or even a super set of them? My answer would probably be no. I think PCEP is compl= ementary with other protocols and is only extended when there is a valid sc= enario, and the same for other protocols (BGP, netconf=A1=AD). When we are = promoting PCEP features (like cc, ls), we are not and should not be criticizing other solutions.

 

PS: IETF was not restricting multi-protocols (ospf vs. isis=A1=AD= ) before, and it was proved to be success in my understanding.

 

Best wishes,

Haomian

 

=B7=A2=BC=FE=C8=CB: Pce [mailto:pce-bounce= s@ietf.org] =B4=FA=B1=ED Daniele Ceccarelli
=B7=A2=CB=CD=CA=B1=BC=E4: 2017=C4=EA7=D4=C224=C8=D5 20:54
=CA=D5=BC=FE=C8=CB: stephane.litkowski@orange.com; Jonathan Hardwick; pce@ietf.org
=B3=AD=CB=CD: pce-chairs@ietf.org
=D6=F7=CC=E2: Re: [Pce] PCEP as an SDN controller protocol?

 

Thanks Jon for starting this discussion.

 

I agree with Stephane when saying that the decision to turn PCEP into= an SDN protocol was already taken a while ago (with the active PCE IMHO).<= o:p>

 

What are the pros and cons of this approach, let me share some loud t= hinking:

 

-        It could be the SBI solution for those networks where there i= s no control plane (e.g. many NMS driven optical networks)

-        It could be a good alternative to Netconf/Restconf as a proto= col between sdn controllers (sort of NBI). It=A1=AFs less configuration dri= ven and more event oriented. It also has different reaction time.

-        On the other side the market seems to be asking more for Netc= onf/Restconf as the single protocol between SDN controller. We should try t= o understand if this is driven by the need for a single protocol doing everything, by the lack of knowledge (of = PCEP as a potential SDN protocol), or other reasons.

-        It could succeed where open flow failed, being the protocol t= hat operates an heterogeneous network (where there is no control plane inte= roperability and provided that readiness is done a priori via NMS).

-        Should we adopt it just for some of the functionalities Jon l= isted or all? Well, for some of them maybe it=A1=AFs not worth it?...<= /o:p>

 

All in all I would say I=A1=AFm leaning towards a yes (to the questio= n in the subject).

 

BR

Daniele 

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stepha= ne.litkowski@orange.com
Sent: luned=A8=AC 24 luglio 2017 14:03
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; pce@ietf.org
Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol?

=  

Hi,

 

As soon as we started with the active stateful PCE, t= he PCE became an SDN controller who takes decision and programs the network= .

So as many already mentioned, PCEP as an SBI is alrea= dy done.


IMO, PCECC does not change significantly PCEP, it=A1=AFs just bring a new k= ind of LSP style for this hop by hop path programming. A controller impleme= nting hop by hop path programming will require more intelligence as it need= s to program nodes in the right order to prevent transient loops=A1=AD

 

The question is more what is the exact scope of PCEP = in term of SBI and do we want to create a protocol that does everything , i= ncluding coffee J= ?

We already have plenty of protocols: BGP, IGP, Netcon= f. Each protocol has strength and weaknesses and I=A1=AFm not sure that we = need to mimic all features in all protocols. What is the gain here ?

The best approach may be to use strength of protocols= and use them for what they are good for:

Example:

IGP has good flooding capability with =A1=B0limited s= cale=A1=B1: interesting when all receivers need the same information

BGP has good flooding capability with large scale and= ability to target specific groups (using route targets/communities) : inte= resting when groups of receivers need the same information

Netconf more generic and point to point

=A1=AD

 

 

IMO:

do we need PCEP-LS ? =3D> This can be discussed, w= e already have two protocols to exchange the topology=A1=AD

do we need to add configuration capabilities in PCEP = =3D> not sure, we have Netconf for that.

Why not limiting PCEP to path programming and path po= licies (traffic steering on path=A1=AD) ?

 

Brgds,

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol?=

 

De= ar PCE WG

 

Th= e purpose of this email is to initiate a discussion about whether we want t= o extend PCEP to allow it to replace the functions that are traditionally p= rovided by the routing and signalling protocols.

 

Or= iginally, PCEP was designed with the goal of providing a distributed path c= omputation service.  In recent years we have extended that mission, an= d added path modification and path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would= traditionally have been performed by the network management plane.

 

We= are now starting to discuss proposals to add more capabilities to PCEP =A8= C capabilities that are traditionally part of routing and signalling. = There were three examples of this in the PCE working group meeting this week.

=A1=A4        The PCECC proposal, which extends PCEP=A1=AFs p= ath instantiation capability so that the PCE can provision a path end-to-en= d by touching each hop along the path.  This replaces the function alr= eady provided by RSVP-TE.

=A1=A4        The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.  This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

=A1=A4        The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.  Again, this replaces functions that = are already designed into the IGPs.

 

Th= ese proposals are taking PCEP in the direction of being a fully-fledged SDN= protocol.  With these proposals, one can envision a network in which = there is no traditional control plane.  PCEP is used to communicate the current network state and to program flows.&nbs= p; These proposals have their roots in the ACTN and PCECC architectures tha= t are adopted within the TEAS working group.  TEAS is very much assumi= ng that this is the direction that we want to take PCEP in.  However, there are two procedural issues, as I see = it.

1.  = ;    We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.  We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the =A1=B0thin end of the wedge=A1=B1.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.  = ;    We do not currently have a charter that allows = us to add this type of capability to PCEP.  Depending on the outcome o= f discussion (1), we can of course extend the charter.

 

Th= is email is to initiate the discussion (1).  So, please reply to the m= ailing list and share your thoughts on whether PCEP should be extended in t= his direction, and how far we should go.

 

I = am hoping to get more than just =A1=B0yes=A1=B1 or =A1=B0no=A1=B1 answers t= o this question (although that would be better than no answer).  I wou= ld like to hear justifications for or against.  Such as, which production networks would run PCEP in place of a traditional control plane= ?  Why is it not desirable to solve the problems in those networks wit= h the traditional control plane?  What harm could this do?  What = would be the operational problems associated with adding these functions to PCEP?

 

Ma= ny thanks

Jo= n

 

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--_000_E0C26CAA2504C84093A49B2CAC3261A43A29E5F5DGGEML503MBXchi_-- From nobody Mon Jul 24 22:21:15 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E624A126B7E; Mon, 24 Jul 2017 22:21:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.02 X-Spam-Level: X-Spam-Status: No, score=-2.02 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=metaswitch.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ntOvfvTd9eCg; Mon, 24 Jul 2017 22:21:10 -0700 (PDT) Received: from NAM02-SN1-obe.outbound.protection.outlook.com (mail-sn1nam02on0091.outbound.protection.outlook.com [104.47.36.91]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 42DF3126DC2; Mon, 24 Jul 2017 22:21:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=metaswitch.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=wV/mXlKvPuqHw2LLngrOvEGXH7XPrAPxv5DviQ0fdvk=; b=FmJQwsE/pBJwjbDqq8oc5wY+py/sgocxo/tBWiZ+a0uaNiZZNzcJ+8mFiwkvpvZiqMtZxXOBPvV2eflV3gi57Pey0iZp8yNZlQDCHUeZ8wQtYCQH54wDhPhr5yXJWzIzzVamYuhe69VOF0pag+wn9L9/COeUmSTjftMLAGYPOWM= Received: from BY2PR0201MB1910.namprd02.prod.outlook.com (10.163.75.152) by BY2PR0201MB1909.namprd02.prod.outlook.com (10.163.75.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1282.10; Tue, 25 Jul 2017 05:21:06 +0000 Received: from BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) by BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) with mapi id 15.01.1282.017; Tue, 25 Jul 2017 05:21:06 +0000 From: Jonathan Hardwick To: "adrian@olddog.co.uk" , "pce@ietf.org" , "draft-ietf-pce-lsp-setup-type@ietf.org" , "draft-ietf-pce-segment-routing@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Thread-Index: AdMCL6Ly08SduGL5TD6iP+F1jVMo6gAGt/mAAC3GQHAAawghAAAVZMMg Date: Tue, 25 Jul 2017 05:21:06 +0000 Message-ID: References: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> In-Reply-To: <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Jonathan.Hardwick@metaswitch.com; x-originating-ip: [86.132.73.220] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; BY2PR0201MB1909; 7: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 x-ms-office365-filtering-correlation-id: 145c5071-2569-40a6-8e08-08d4d31cf3c7 x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254075)(300000503095)(300135400095)(2017052603031)(201703131423075)(201703031133081)(201702281549075)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); SRVR:BY2PR0201MB1909; x-ms-traffictypediagnostic: BY2PR0201MB1909: x-exchange-antispam-report-test: UriScan:(21748063052155); x-microsoft-antispam-prvs: x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(100000700101)(100105000095)(100000701101)(100105300095)(100000702101)(100105100095)(6040450)(601004)(2401047)(8121501046)(5005006)(93006095)(93001095)(100000703101)(100105400095)(10201501046)(3002001)(6041248)(20161123562025)(20161123564025)(20161123560025)(201703131423075)(201702281528075)(201703061421075)(201703061406153)(20161123558100)(20161123555025)(6072148)(100000704101)(100105200095)(100000705101)(100105500095); SRVR:BY2PR0201MB1909; BCL:0; PCL:0; RULEID:(100000800101)(100110000095)(100000801101)(100110300095)(100000802101)(100110100095)(100000803101)(100110400095)(100000804101)(100110200095)(100000805101)(100110500095); SRVR:BY2PR0201MB1909; x-forefront-prvs: 03793408BA x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(39850400002)(39410400002)(39450400003)(39840400002)(39400400002)(199003)(37854004)(189002)(51444003)(55016002)(99286003)(93886004)(102836003)(9686003)(2201001)(66066001)(790700001)(230783001)(189998001)(2950100002)(236005)(68736007)(6246003)(229853002)(54896002)(3846002)(6116002)(6306002)(2501003)(97736004)(7736002)(77096006)(2900100001)(6436002)(86362001)(38730400002)(6506006)(7696004)(33656002)(81166006)(74316002)(81156014)(54356999)(4326008)(5660300001)(53546010)(14454004)(3660700001)(76176999)(8936002)(101416001)(53936002)(8676002)(72206003)(2906002)(478600001)(25786009)(106356001)(50986999)(3280700002)(105586002); DIR:OUT; SFP:1102; SCL:1; SRVR:BY2PR0201MB1909; H:BY2PR0201MB1910.namprd02.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: metaswitch.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_BY2PR0201MB1910C3BF88D19129BC62655F84B80BY2PR0201MB1910_" MIME-Version: 1.0 X-OriginatorOrg: metaswitch.com X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Jul 2017 05:21:06.7006 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9d9e56eb-f613-4ddb-b27b-bfcdf14b2cdb X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR0201MB1909 Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 05:21:14 -0000 --_000_BY2PR0201MB1910C3BF88D19129BC62655F84B80BY2PR0201MB1910_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I agree that allowing optional sub-TLVs is a good thing. However, this str= ongly suggests that SR-PCE-CAPABILITY should become a sub-TLV, which is a n= on-backwards compatible change. So, we are back to my original question. Implementers - any views? Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 24 July 2017 19:51 To: Jonathan Hardwick ; pce@ietf.org; dra= ft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.or= g Cc: pce-chairs@ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Yes to that, Jon. But what happens when the next thing comes along? Since sub-TLVs can be present, I would suggest to use a Setup-Type TLV with= a bit map as I previously described in my email, and add optional sub-TLVs= dependent on the bits that are set. Isn't that the best of both worlds? Adrian From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitch.com] Sent: 24 July 2017 09:15 To: adrian@olddog.co.uk; pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Cc: pce-chairs@ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Adrian, The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also conta= ins information about the maximum SID depth. However, I like your idea and= I think that it gives us a better way to do this without breaking backward= s compatibility with existing SR implementations. Suppose we introduce a setup-type TLV into the OPEN object as you propose, = and assign a bit to each setup type. If the TLV is absent, then RSVP-TE is supported. If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE= and SR are supported. This retains backwards compatibility with existing = SR implementations. If the TLV is present, then the bits indicate which setup types are support= ed. We would modify the LSP setup type draft to say that implementations suppor= ting path setup types other than RSVP-TE SHOULD include the setup-type TLV. It's not exactly beautiful, but it's not as ugly as RSVP-TE-NON-SUPPORT. Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 21 July 2017 19:55 To: Jonathan Hardwick >; pce@ietf.org; draft-ietf-pce-l= sp-setup-type@ietf.org; draf= t-ietf-pce-segment-routing@ietf.org Cc: pce-chairs@ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Well, personally, if I was designing this, I would not a whole TLV for each= bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is suppor= ted. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to= the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend o= n what implementations have done already. Adrian From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 To: pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.o= rg; draft-ietf-pce-segment-r= outing@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] Can we make a non-backwards compatible change to draft-ietf-= pce-lsp-setup-type? Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an import= ant decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker= to indicate that it can't (or won't) support RSVP-TE as a path setup type.= It is entirely plausible that a node might not support RSVP-TE, or else h= ave it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a sp= eaker to declare that they do or don't have support for RSVP-TE paths. The= re are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missin= g, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it= means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support = RSVP-TE. If this TLV is omitted, it will be assumed that they do support R= SVP-TE. The problem with (1) is that it is not backwards compatible. Any existing = SR implementation which also supports RSVP will not currently send this new= capability. So, if we make change (1) then forwards-level implementations= will incorrectly conclude that such backwards-level implementations do not= support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only d= o something ugly with a new protocol extension if we simply can't avoid doi= ng it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP= -TE environment that would be broken if we made change (1)? Thanks Jon --_000_BY2PR0201MB1910C3BF88D19129BC62655F84B80BY2PR0201MB1910_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I agree that allowing = optional sub-TLVs is a good thing.  However, this strongly suggests th= at SR-PCE-CAPABILITY should become a sub-TLV, which is a non-backwards comp= atible change.  So, we are back to my original question.

 

Implementers – a= ny views?

 

Cheers

Jon<= /p>

 

 

From: Adrian Farrel [mailto:adrian@olddog.co.uk]
Sent: 24 July 2017 19:51
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; pce@= ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-ro= uting@ietf.org
Cc: pce-chairs@ietf.org
Subject: RE: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Yes to that, Jon. But = what happens when the next thing comes along?

 

Since sub-TLVs can be = present, I would suggest to use a Setup-Type TLV with a bit map as I previo= usly described in my email, and add optional sub-TLVs dependent on the bits= that are set.

 

Isn't that the best of= both worlds?

 

Adrian

 

From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitch.com<= /a>]
Sent: 24 July 2017 09:15
To: adrian@olddog.co.uk; pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org
Cc: pce-chairs@ietf.org
Subject: RE: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Adrian,

 

The SR-PCE-CAPABILITY = TLV is more than just a Boolean value - it also contains information about = the maximum SID depth.  However, I like your idea and I think that it = gives us a better way to do this without breaking backwards compatibility with existing SR implementations.

 

Suppose we introduce a= setup-type TLV into the OPEN object as you propose, and assign a bit to ea= ch setup type.

If the TLV is absent, = then RSVP-TE is supported.

If the TLV is absent a= nd the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR are supported.=   This retains backwards compatibility with existing SR implementation= s.

If the TLV is present,= then the bits indicate which setup types are supported.<= /p>

 

We would modify the LS= P setup type draft to say that implementations supporting path setup types = other than RSVP-TE SHOULD include the setup-type TLV.

 

It’s not exactly= beautiful, but it’s not as ugly as RSVP-TE-NON-SUPPORT.

 

Cheers

Jon<= /p>

 

 

From: Adrian Farrel [mailto:adrian@olddog.c= o.uk]
Sent: 21 July 2017 19:55
To: Jonathan Hardwick <= Jonathan.Hardwick@metaswitch.com>; pce@ietf.org; draft-ietf-pce-lsp-setup-ty= pe@ietf.org; draft-ietf-pce-segment-rou= ting@ietf.org
Cc: pce-chairs@ietf.org
Subject: RE: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Well, personally, if I= was designing this, I would not a whole TLV for each bit flag!<= /span>

I would have a Setup-T= ype TLV.

If that TLV is absent,= RSVP-TE is supported.

If the TLV is present,= each bit means that a different setup type is supported.=

 

That means...

Legacy nodes don't inc= lude the TLV and are assumed to support RSVP-TE

Legacy nodes that rece= ive the TLV don't know what it means and so object to the Open (leaving a n= ew node to re-Open for RSVP-TE only).

New nodes include the = TLV and so indicate explicitly what they support.

 

I know it is late for = that type of change, so how we proceed might depend on what implementations= have done already.

 

Adrian

 

From: Pce [mail= to:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: 21 July 2017 16:07
To: pce@ietf.org; draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] Can we make a non-backwards compatible change to draf= t-ietf-pce-lsp-setup-type?

 

Dear PCE-ers

 

I don’t want to distract from the SDN topic to= o much, but we have an important decision to make about draft-ietf-pce-lsp-= setup-type.

 

The shepherd review raised an issue that there is no= way for a PCEP speaker to indicate that it can’t (or won’t) su= pport RSVP-TE as a path setup type.  It is entirely plausible that a n= ode might not support RSVP-TE, or else have it disabled, for example in an SR-only network.

 

We think that draft-ietf-pce-lsp-setup-type should b= e changed to allow a speaker to declare that they do or don’t have su= pport for RSVP-TE paths.  There are two proposals.

 

1. &n= bsp;    Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-CAPABILITY TLV in their OPEN object.  If this TLV if mi= ssing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) the= n it means that the speaker does not support RSVP-TE as a path setup type.

2. &n= bsp;    Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON’T sup= port RSVP-TE.  If this TLV is omitted, it will be assumed that they do= support RSVP-TE.

 

The problem with (1) is that it is not backwards com= patible.  Any existing SR implementation which also supports RSVP will= not currently send this new capability.  So, if we make change (1) th= en forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE.=

 

The problem with (2) is that it is ugly, and in my o= pinion we should only do something ugly with a new protocol extension if we= simply can’t avoid doing it.

 

And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we ma= de change (1)?

 

Thanks

Jon

 

--_000_BY2PR0201MB1910C3BF88D19129BC62655F84B80BY2PR0201MB1910_-- From nobody Tue Jul 25 01:31:12 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B7B89127978; Tue, 25 Jul 2017 01:31:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.81 X-Spam-Level: X-Spam-Status: No, score=-2.81 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_HTML_ONLY=0.723, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.001, SPF_SOFTFAIL=0.665, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fsXkUjaDk-3p; Tue, 25 Jul 2017 01:31:08 -0700 (PDT) Received: from r-mail2.rd.orange.com (r-mail2.rd.orange.com [217.108.152.42]) by ietfa.amsl.com (Postfix) with ESMTP id D653912441E; Tue, 25 Jul 2017 01:31:07 -0700 (PDT) Received: from r-mail2.rd.orange.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id A43165D8B43; Tue, 25 Jul 2017 10:31:05 +0200 (CEST) Received: from FTRDCH01.rd.francetelecom.fr (unknown [10.194.32.11]) by r-mail2.rd.orange.com (Postfix) with ESMTP id 704E25D8B38; Tue, 25 Jul 2017 10:31:03 +0200 (CEST) Received: from [10.193.71.121] (10.193.71.121) by FTRDCH01.rd.francetelecom.fr (10.194.32.11) with Microsoft SMTP Server id 14.3.352.0; Tue, 25 Jul 2017 10:31:02 +0200 To: Jonathan Hardwick , "adrian@olddog.co.uk" , "pce@ietf.org" CC: "draft-ietf-pce-lsp-setup-type@ietf.org" , "draft-ietf-pce-segment-routing@ietf.org" References: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> From: Julien Meuric Organization: Orange Message-ID: Date: Tue, 25 Jul 2017 10:31:02 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/html; charset="windows-1252" Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 08:31:11 -0000 Hi,

I agree that capability bitmap with optional capability-specific sub-TLVs would be the way to go from scratch. However the SR-PCE-CAPABILITY already has an early allocated codepoint, and RFC 7120 says that "if there is a change, implementations based on the earlier and later specifications must be seamlessly interoperable."
As a result, it seems to me that adding this new format may require that the I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reasons.

Cheers,

Julien


Jul. 25, 2017 - Jonathan.Hardwick@metaswitch.com:

I agree that allowing optional sub-TLVs is a good thing. However, this strongly suggests that SR-PCE-CAPABILITY should become a sub-TLV, which is a non-backwards compatible change. So, we are back to my original question.

Implementers any views?

Cheers

Jon

From: Adrian Farrel [mailto:adrian@olddog.co.uk]
Sent: 24 July 2017 19:51

Yes to that, Jon. But what happens when the next thing comes along?

Since sub-TLVs can be present, I would suggest to use a Setup-Type TLV with a bit map as I previously described in my email, and add optional sub-TLVs dependent on the bits that are set.

Isn't that the best of both worlds?

Adrian

From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitch.com]
Sent: 24 July 2017 09:15

Adrian,

The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also contains information about the maximum SID depth. However, I like your idea and I think that it gives us a better way to do this without breaking backwards compatibility with existing SR implementations.

Suppose we introduce a setup-type TLV into the OPEN object as you propose, and assign a bit to each setup type.

If the TLV is absent, then RSVP-TE is supported.

If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR are supported. This retains backwards compatibility with existing SR implementations.

If the TLV is present, then the bits indicate which setup types are supported.

We would modify the LSP setup type draft to say that implementations supporting path setup types other than RSVP-TE SHOULD include the setup-type TLV.

Its not exactly beautiful, but its not as ugly as RSVP-TE-NON-SUPPORT.

Cheers

Jon

From: Adrian Farrel [mailto:adrian@olddog.co.uk]
Sent: 21 July 2017 19:55

Well, personally, if I was designing this, I would not a whole TLV for each bit flag!

I would have a Setup-Type TLV.

If that TLV is absent, RSVP-TE is supported.

If the TLV is present, each bit means that a different setup type is supported.

That means...

Legacy nodes don't include the TLV and are assumed to support RSVP-TE

Legacy nodes that receive the TLV don't know what it means and so object to the Open (leaving a new node to re-Open for RSVP-TE only).

New nodes include the TLV and so indicate explicitly what they support.

I know it is late for that type of change, so how we proceed might depend on what implementations have done already.

Adrian

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: 21 July 2017 16:07

Dear PCE-ers

I dont want to distract from the SDN topic too much, but we have an important decision to make about draft-ietf-pce-lsp-setup-type.

The shepherd review raised an issue that there is no way for a PCEP speaker to indicate that it cant (or wont) support RSVP-TE as a path setup type. It is entirely plausible that a node might not support RSVP-TE, or else have it disabled, for example in an SR-only network.

We think that draft-ietf-pce-lsp-setup-type should be changed to allow a speaker to declare that they do or dont have support for RSVP-TE paths. There are two proposals.

1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it means that the speaker does not support RSVP-TE as a path setup type.

2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DONT support RSVP-TE. If this TLV is omitted, it will be assumed that they do support RSVP-TE.

The problem with (1) is that it is not backwards compatible. Any existing SR implementation which also supports RSVP will not currently send this new capability. So, if we make change (1) then forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE.

The problem with (2) is that it is ugly, and in my opinion we should only do something ugly with a new protocol extension if we simply cant avoid doing it.

And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we made change (1)?

Thanks

Jon


From nobody Tue Jul 25 02:36:27 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3DD31131C29; Tue, 25 Jul 2017 02:36:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.81 X-Spam-Level: X-Spam-Status: No, score=-2.81 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_HTML_ONLY=0.723, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.001, SPF_SOFTFAIL=0.665, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SjzK3NU9Za7I; Tue, 25 Jul 2017 02:36:25 -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 AA4FB131945; Tue, 25 Jul 2017 02:36:24 -0700 (PDT) Received: from r-mail1.rd.orange.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 691D4DE4005; Tue, 25 Jul 2017 11:36:23 +0200 (CEST) Received: from FTRDCH01.rd.francetelecom.fr (unknown [10.194.32.11]) by r-mail1.rd.orange.com (Postfix) with ESMTP id 54849A442FD; Tue, 25 Jul 2017 11:36:23 +0200 (CEST) Received: from [10.193.71.121] (10.193.71.121) by FTRDCH01.rd.francetelecom.fr (10.194.32.11) with Microsoft SMTP Server id 14.3.352.0; Tue, 25 Jul 2017 11:36:22 +0200 From: Julien Meuric To: Daniele Ceccarelli , "pce@ietf.org" CC: Jonathan Hardwick , "pce-chairs@ietf.org" References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> Organization: Orange Message-ID: Date: Tue, 25 Jul 2017 11:36:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/html; charset="windows-1252" Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 09:36:26 -0000 Hi Daniele,

[Operator hat on.]

I agree on several things you wrote, starting from the answer to Jon's rhetorical question, which cares more about how much (at least I've never noticed my co-chair has a short memory).

Nevertheless the sentence below needs to be corrected, because it happens to be wrong: "optical networks with no control plane" is as inaccurate as "a fuel car with no battery".
Not relying on the high-end version of this mean to realize the core task of an equipment must not hide that most (even those Sonet/SDH ADMs) of the deployed optical devices do (mostly for management traffic, whose fate PCEP may share)...:
- perform IP forwarding,
- have a routing table,
- run an IGP to populate that routing table,
- run an IGP to advertise their attached addresses,
- support a large set of (IP-based) protocols for various purposes (e.g., ICMP, DHCP, SSH, SMTP), i.e. squeezing many roles within a single protocol is a non-goal.

A possible rephrasing could be "networks where the control plane is limited to background tasks", which reminds that operators deploy "fully packaged cars", not just "raw wheels with a motor" according to the misleading scope assumed in the current discussion.

Thanks,

Julien


Jul. 24, 2017 - daniele.ceccarelli@ericsson.com:

  • It could be the SBI solution for those networks where there is no control plane (e.g. many NMS driven optical networks)

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--_000_AM2PR07MB0994B05A7B1C2A62EBB5E95CF0B80AM2PR07MB0994eurp_-- From nobody Tue Jul 25 03:56:39 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1965C12778D; Tue, 25 Jul 2017 03:56:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.588 X-Spam-Level: X-Spam-Status: No, score=-2.588 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MVQhTJZWNklv; Tue, 25 Jul 2017 03:56:33 -0700 (PDT) Received: from asmtp4.iomartmail.com (asmtp4.iomartmail.com [62.128.201.175]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E977B12EACC; Tue, 25 Jul 2017 03:56:31 -0700 (PDT) Received: from asmtp4.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6PAuTMK011232; Tue, 25 Jul 2017 11:56:29 +0100 Received: from 950129200 ([213.205.252.194]) (authenticated bits=0) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6PAuECL010975 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 25 Jul 2017 11:56:16 +0100 Reply-To: From: "Adrian Farrel" To: "'Julien Meuric'" , "'Jonathan Hardwick'" , Cc: , References: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> In-Reply-To: Date: Tue, 25 Jul 2017 11:56:14 +0100 Message-ID: <127d01d30534$a47cb1b0$ed761510$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_127E_01D3053D.064845A0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQFCsVj2MV66vwevRzfpEXYXn4SlsgLb6Lt6AoGNBjECUAnrYAH07KFjARW4HJ+jLz7AQA== Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23216.006 X-TM-AS-Result: No--16.761-10.0-31-10 X-imss-scan-details: No--16.761-10.0-31-10 X-TMASE-MatchedRID: yebcs53SkkCajZkb8TuLc0hEDfw/93BuGSqdEmeD/nWNTnqOMBIJ4dLi dmlpOoRWHJg6MNOhyoF4qgEOqtQFz7Wd3Qhj3xBV+NCQDut0K4XurwUTtj+IjbrtDe4+j0oj4d2 NauEDjqyQqrAU9lDg4Onn1b2pRfhoL0W1btd8e563UCG/IQp2PmgU1o1xV13f4M8TN/xanMtnyy hFu6pbB/ZBqy/eCHkppwq6Z4V07sKHTNZBcJlnyGsNSdYAFydSELbqrOgWzyfMcZL/toKwUlYWw xB9tw0TUAbfT4SSg9y9uzWFpAqH0PnVY0DWsTq3j5hLPCX3ZdN6zDxGcFEbCt14Aqe8EzF8rB13 XiPqdPJGj/FzgUN3VjWQ5LXkCVthPD57pIba+wFVnniKh7YTC3uuvqd1y3lISZV6zWnCdrmGkYl EJW/HpBXctdiPalpQd+baqQ3qUqcr9jdu7nFqnAGIf5yVjVh01kqyrcMalqUWedCrEHXal2en+L 9VOJ49IdArxRz1+Ze7FoEqAiI7+xwYhqcijEJpfFMOK/HqfAYfA3Rd93Bc95JNn8BXcyA8lHXpp cpLXlDvOZMCM2DEpeEccfDC+OkOifOexP8ynNMlAj6R+xEl2l+PJNkR/r/XyPRAwD/3abb4Q3hE qKS5Dnb26ey5GGhEuBLpVDdc4Gquyr/sGF0bIIlWJXiASK2PnophrTcsI7Z0PA/ki2kI7BxJEX0 k/k7OLiNvWfV40DdEdqKGnxMcYDGgk0AvH9/hndu3heVAxaMP4vBWNr0zgSA6eO+NDmAxp4Wcmy qBbFxC3bjvSDu959+suYAg9ZWJMxvA4OPLCf6eAiCmPx4NwGmRqNBHmBvevqq8s2MNhPB9j2Gwz TE3vXkguuQorcgMkiO8POnIZDvqBPXcbSQiDd3YGwoL72j7dymW0vBVC99+3BndfXUhXQ== Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 10:56:37 -0000 This is a multipart message in MIME format. ------=_NextPart_000_127E_01D3053D.064845A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sighing slightly:-) If, as may be the case, there is a demand to make this work either as currently specified or to be seamlessly interoperable with what is already specified then so be it. Let's make that as a conscious decision. However, I think that using 7120 as an "excuse" is a bad idea. What 7120 is saying is that the allocated code point must show some stability in meaning from the point of early allocation on to RFC (just as it would need to if the RFC was revised). But that is not saying that, upon noticing that we are a herd of lemmings rushing towards the cliff we must say "We have always rushed towards the cliff. Our parents rushed towards the cliff. We must continue even if it means we plunge to our deaths." Of course, nothing so dramatic, but... If the current specification works well - stay with it. If the current specification works but is clumsy - tweak it in a backward compatible way If the current specification is broken in a minor way - fix it in a backward compatible way If the current specification is more seriously broken - burn a new code point to fix it In my earlier emails I was only speculating on "how I would have done this if starting from scratch." Obviously (?) I should have participated in WG discussions much earlier in the cycle, and as a result my opinion really only counts if either: - the current specification is more seriously broken or - there is no WG desire to stick close to the current specification. Clearly, although people who implement against I-Ds are doing so at their own risk, we should not unnecessarily burden early implementations with changes just for the sake of change. There is a sliding scale of "better ways to do things" that incorporates "it's a bit messy," "it will be easier to maintain and extend," all the way up to "it's broken." The WG will want to work out where we are on that scale and weigh it against the cost and inconvenience of change. Shipping in software may be one measure. Deployed and in use is another measure. Cheers, Adrian From: Julien Meuric [mailto:julien.meuric@orange.com] Sent: 25 July 2017 09:31 To: Jonathan Hardwick; adrian@olddog.co.uk; pce@ietf.org Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Hi, I agree that capability bitmap with optional capability-specific sub-TLVs would be the way to go from scratch. However the SR-PCE-CAPABILITY already has an early allocated codepoint, and RFC 7120 says that "if there is a change, implementations based on the earlier and later specifications must be seamlessly interoperable." As a result, it seems to me that adding this new format may require that the I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reasons. Cheers, Julien Jul. 25, 2017 - Jonathan.Hardwick@metaswitch.com: I agree that allowing optional sub-TLVs is a good thing. However, this strongly suggests that SR-PCE-CAPABILITY should become a sub-TLV, which is a non-backwards compatible change. So, we are back to my original question. Implementers - any views? Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 24 July 2017 19:51 Yes to that, Jon. But what happens when the next thing comes along? Since sub-TLVs can be present, I would suggest to use a Setup-Type TLV with a bit map as I previously described in my email, and add optional sub-TLVs dependent on the bits that are set. Isn't that the best of both worlds? Adrian From: Jonathan Hardwick [ mailto:Jonathan.Hardwick@metaswitch.com] Sent: 24 July 2017 09:15 Adrian, The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also contains information about the maximum SID depth. However, I like your idea and I think that it gives us a better way to do this without breaking backwards compatibility with existing SR implementations. Suppose we introduce a setup-type TLV into the OPEN object as you propose, and assign a bit to each setup type. If the TLV is absent, then RSVP-TE is supported. If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR are supported. This retains backwards compatibility with existing SR implementations. If the TLV is present, then the bits indicate which setup types are supported. We would modify the LSP setup type draft to say that implementations supporting path setup types other than RSVP-TE SHOULD include the setup-type TLV. It's not exactly beautiful, but it's not as ugly as RSVP-TE-NON-SUPPORT. Cheers Jon From: Adrian Farrel [ mailto:adrian@olddog.co.uk] Sent: 21 July 2017 19:55 Well, personally, if I was designing this, I would not a whole TLV for each bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is supported. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend on what implementations have done already. Adrian From: Pce [ mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an important decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker to indicate that it can't (or won't) support RSVP-TE as a path setup type. It is entirely plausible that a node might not support RSVP-TE, or else have it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a speaker to declare that they do or don't have support for RSVP-TE paths. There are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support RSVP-TE. If this TLV is omitted, it will be assumed that they do support RSVP-TE. The problem with (1) is that it is not backwards compatible. Any existing SR implementation which also supports RSVP will not currently send this new capability. So, if we make change (1) then forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only do something ugly with a new protocol extension if we simply can't avoid doing it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we made change (1)? Thanks Jon ------=_NextPart_000_127E_01D3053D.064845A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Sighing = slightly:-)

 

If, as may be the = case, there is a demand to make this work either as currently specified = or to be seamlessly interoperable with what is already specified then so = be it. Let's make that as a conscious decision.

 

However, I think that = using 7120 as an "excuse" is a bad idea. What 7120 is saying = is that the allocated code point must show some stability in meaning = from the point of early allocation on to RFC (just as it would need to = if the RFC was revised). But that is not saying that, upon noticing that = we are a herd of lemmings rushing towards the cliff we must say "We = have always rushed towards the cliff. Our parents rushed towards the = cliff. We must continue even if it means we plunge to our = deaths."

 

Of course, nothing so = dramatic, but...

 

If the current = specification works well - stay with it.

If the current = specification works but is clumsy - tweak it in a backward compatible = way

If the current = specification is broken in a minor way - fix it in a backward compatible = way

If the current = specification is more seriously broken - burn a new code point to fix = it

 

In my earlier emails I = was only speculating on "how I would have done this if starting = from scratch." Obviously (?) I should have participated in WG = discussions much earlier in the cycle, and as a result my opinion really = only counts if either:

- the current = specification is more seriously broken

or

- there is no WG = desire to stick close to the current = specification.

 

Clearly, although = people who implement against I-Ds are doing so at their own risk, we = should not unnecessarily burden early implementations with changes just = for the sake of change. There is a sliding scale of "better ways to = do things" that incorporates "it's a bit messy," "it = will be easier to maintain and extend," all the way up to = "it's broken." The WG will want to work out where we are on = that scale and weigh it against the cost and inconvenience of change. = Shipping in software may be one measure. Deployed and in use is another = measure.

 

Cheers,

Adrian

 

From: Julien Meuric [mailto:julien.meuric@orange.com]
Sent: 25 = July 2017 09:31
To: Jonathan Hardwick; adrian@olddog.co.uk; = pce@ietf.org
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; = draft-ietf-pce-segment-routing@ietf.org
Subject: Re: [Pce] Can = we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Hi,

I agree = that capability bitmap with optional capability-specific sub-TLVs would = be the way to go from scratch. However the SR-PCE-CAPABILITY already has = an early allocated codepoint, and RFC 7120 says that "if there is a = change, implementations based on the earlier and later specifications = must be seamlessly interoperable."
As a result, it seems to me = that adding this new format may require that the I-D keeps documenting = an optional SR-PCE-CAPABILITY TLV for legacy = reasons.

Cheers,

Julien

I agree that allowing = optional sub-TLVs is a good thing.  However, this strongly suggests = that SR-PCE-CAPABILITY should become a sub-TLV, which is a non-backwards = compatible change.  So, we are back to my original = question.

 

Implementers – any = views?

 

Cheers

Jon

 

 

From:= Adrian = Farrel [mailto:adrian@olddog.co.uk] =
Sent: 24 July 2017 19:51

 

Yes to that, Jon. But = what happens when the next thing comes along?

 

Since sub-TLVs can be = present, I would suggest to use a Setup-Type TLV with a bit map as I = previously described in my email, and add optional sub-TLVs dependent on = the bits that are set.

 

Isn't that the best of = both worlds?

 

Adrian

 

From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitc= h.com]
Sent: 24 July 2017 = 09:15

 

Adrian,

 

The SR-PCE-CAPABILITY = TLV is more than just a Boolean value - it also contains information = about the maximum SID depth.  However, I like your idea and I think = that it gives us a better way to do this without breaking backwards = compatibility with existing SR implementations.

 

Suppose we introduce a = setup-type TLV into the OPEN object as you propose, and assign a bit to = each setup type.

If the TLV is absent, then RSVP-TE is = supported.

If the TLV is absent and the SR-PCE-CAPABILITY = TLV is present, then RSVP-TE and SR are supported.  This retains = backwards compatibility with existing SR = implementations.

If the TLV is present, then the bits indicate = which setup types are supported.

 

We would modify the LSP = setup type draft to say that implementations supporting path setup types = other than RSVP-TE SHOULD include the setup-type = TLV.

 

It’s not exactly = beautiful, but it’s not as ugly as = RSVP-TE-NON-SUPPORT.

 

Cheers

Jon

 

 

From:= Adrian = Farrel [mailto:adria= n@olddog.co.uk] =
Sent: 21 July 2017 19:55

 

Well, personally, if I = was designing this, I would not a whole TLV for each bit = flag!

I would have a Setup-Type = TLV.

If that TLV is absent, RSVP-TE is = supported.

If the TLV is present, each bit means that a = different setup type is supported.

 

That = means...

Legacy nodes don't include the TLV and are = assumed to support RSVP-TE

Legacy nodes that = receive the TLV don't know what it means and so object to the Open = (leaving a new node to re-Open for RSVP-TE = only).

New nodes include the TLV and so indicate = explicitly what they support.

 

I know it is late for = that type of change, so how we proceed might depend on what = implementations have done already.

 

Adrian

 

From: Pce [mailto:pce-bounces@ietf.org= ] On Behalf Of Jonathan = Hardwick
Sent: 21 July 2017 16:07

 

Dear PCE-ers

 

I = don’t want to distract from the SDN topic too much, but we have an = important decision to make about = draft-ietf-pce-lsp-setup-type.

 

The shepherd = review raised an issue that there is no way for a PCEP speaker to = indicate that it can’t (or won’t) support RSVP-TE as a path = setup type.  It is entirely plausible that a node might not support = RSVP-TE, or else have it disabled, for example in an SR-only = network.

 

We think that draft-ietf-pce-lsp-setup-type should be = changed to allow a speaker to declare that they do or don’t have = support for RSVP-TE paths.  There are two = proposals.

 

1.      Change = draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) = RSVP-TE-CAPABILITY TLV in their OPEN object.  If this TLV if = missing, but some other CAPABILITY TLV is present (such as = SR-CAPABILITY) then it means that the speaker does not support RSVP-TE = as a path setup type.

2.      Change = draft-ietf-pce-lsp-setup-type so that speakers MUST include a (new) = RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON’T support = RSVP-TE.  If this TLV is omitted, it will be assumed that they do = support RSVP-TE.

 

The problem = with (1) is that it is not backwards compatible.  Any existing SR = implementation which also supports RSVP will not currently send this new = capability.  So, if we make change (1) then forwards-level = implementations will incorrectly conclude that such backwards-level = implementations do not support RSVP-TE.

 

The problem = with (2) is that it is ugly, and in my opinion we should only do = something ugly with a new protocol extension if we simply can’t = avoid doing it.

 

And so the = question: are there any *deployments* of PCEP in a mixed = SR/RSVP-TE environment that would be broken if we made change = (1)?

 

Thanks

Jon

 

 

------=_NextPart_000_127E_01D3053D.064845A0-- From nobody Tue Jul 25 03:59:09 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 59E3612778D; Tue, 25 Jul 2017 03:59:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.608 X-Spam-Level: X-Spam-Status: No, score=-2.608 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Aeek0uqvHx_t; Tue, 25 Jul 2017 03:59:05 -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 1AF2F124E15; Tue, 25 Jul 2017 03:59:03 -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 v6PAwxAT031600; Tue, 25 Jul 2017 11:59:00 +0100 Received: from 950129200 ([213.205.252.194]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id v6PAwr9h031379 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 25 Jul 2017 11:58:56 +0100 Reply-To: From: "Adrian Farrel" To: "'Daniele Ceccarelli'" , "'Julien Meuric'" , Cc: References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: Date: Tue, 25 Jul 2017 11:58:39 +0100 Message-ID: <129901d30535$03d06170$0b712450$@olddog.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_129A_01D3053D.65A2FA40" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGzo1ScqRzafdGA5mNKS+4SVV00EQGRvhZ3AZHrbP8BxcvX2wHHQLSKom2ZixA= Content-Language: en-gb X-TM-AS-MML: disable X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23216.006 X-TM-AS-Result: No--17.922-10.0-31-10 X-imss-scan-details: No--17.922-10.0-31-10 X-TMASE-MatchedRID: pS5owHKhBO3eWWO+WO023mgws6g0ewz28GRhP/nTHNYlP1vFxquW9jyd OVERLYzlqyhTW3Ry1CCtEWMA+JcKcIxOAnnhEoAzOX8ug76mOgBX/6cGnS8uwT3BZApXJkDbCdO OhuetM4O80jzahW50Ugs9J1GWVL/S9A9EfhuU0xyomy3eaWZ2rilayzmQ9QV08cWgFw6wp7P9ir mqgEMJQ1uLNdP3lWylNAR3qsE4Rhy4iHV19ktwnRcqpH7D1rtQDNXyKfpIUCNxOimTS6/0f+oG0 ef98F1ngWxqFqaN8Jprog+iZiyFaSFVxZ0aZ5M95gCHftmwEMILy8o3bV9yTbV5fSMRD1zqLuyt 5Ak2dzuqYQZYge7XfeK8/Z5zscRl8c42iOE6XAkmtTGirqG/Dwtx7lnIMkAmtWFMPVR2Crw9Z1u 9dSI3IJ5PSOMffyxBOK2cnrD1odyrpZNFNXnpnC4uTw19Klh6TJDl9FKHbrmFz4nDgsy1wFYzfj hl1pETtLADDH7eSUDnfjc43kihFKyIgRbAMekikfUZ6LJOetfTBg/CbgV2T2rhyhOS2sZfwz/W9 8tT86Yojm1yp32BM6uJm2QuCxjNR1vveBQPCRdCvapcIkxJX66IBbSnfz+3ut/GVGOoEneALjqn IlNKdNXjKfop/WvT3wqC9Qsu3hf9+rKlRf1WaEtzk37SzX4NlPV6Vaqi4bAoDMZ3xV44iHVw2xx cZthfnb+0a0qIQCQpJvJLpbPfP2hKBwPmHsPFu72KpAktHS+2InV6AaP6lZUhT38IzfaR7KBBZ2 QBUyxPifNxprH2cuulrrvUsCg/hxaO3bw3PjCeAiCmPx4NwGmRqNBHmBve1kTfEkyaZdxFGCd0S 0NCshFm+2NfAVywHZMJdhR5L52/rmSVdQ8DV/gtZ4KFbB19WClYJu9r4yY= Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 10:59:08 -0000 This is a multipart message in MIME format. ------=_NextPart_000_129A_01D3053D.65A2FA40 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I think it is all slightly a distraction :-) =20 It is possible to run an MCN without a routing protocol depending on the = topology of the MCN. Many MCNs can be achieved with relatively simple = static routes. =20 Statements (Haomian) that optical devices cannot run BGP-LS seem to me = to be an exaggeration. I understand why they choose to not do it. =20 The use of BGP-LS or PCEP-LS in a network where an IGP-TE is running may = be excessive since making a PCE a passive partner in an IGP is very = cheap and easy. =20 =20 =20 All of these things are an aside to the deployment models being = discussed. Those models are more closely SDN-based, and that fact may be = missing from the conversation. =20 Consider a network that runs without a horizontal control plane (i.e., = no IGP-TE and no signaling protocol). In this mode, devices are = individually provisioned from a controller using a protocol such as PCEP = in a PCE-CC mode. The controller-device communications run through an = MCN, but that network could be fairly simply constructed of P2P = forwarding paths or (in the case of an in-fiber MCN) by taking advantage = of default static routes. =20 In this network, the question to address is "How does the PCE learn the = topology of the TE network?" I believe that at least some of the = proponents of PCEP-LS are suggesting that *each* NE can have a PCEP = session that is used not only for programming the NE for forwarding, but = also for reporting a fragment of the topology. In other words, PCEP-LS = would be used by *each* NE to report its local links. (Whether this = assumes that the NEs are running some form of discovery/verification = protocol such as LMP is maybe something we should also be talking = about.) =20 I find myself asking, "How does an individual NE know its configuration? = What identities does it give to links? Where do those links connect to?" = If that information is pushed by configuration, couldn't that = configuration station push that information to the PCE as well. =20 So maybe what is needed to make this clear is a tiny little architecture = statement? That way people hearing "PCEP-LS" will not think "dump the = whole topology from a single node in the network" the way that we have = become accustomed to thinking with BGP-LS, but will see the picture = being solved and will understand the flow of information. =20 Thanks, Adrian =20 =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Daniele Ceccarelli Sent: 25 July 2017 11:27 To: Julien Meuric; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 HI Julien, =20 your correction is=E2=80=A6correct =F0=9F=98=8A =20 You=E2=80=99re referring to the protocols running on the DCN, or more = appropriately on the MCN, right? The IGP is usually non TE and just = providing reachability info=E2=80=A6but as PCEP can be modified for = other purposes, they can be modified as well. On this I agree with you. =20 Cheers Daniele =20 =20 From: Julien Meuric [mailto:julien.meuric@orange.com]=20 Sent: marted=C3=AC 25 luglio 2017 11:36 To: Daniele Ceccarelli ; pce@ietf.org Cc: Jonathan Hardwick ; = pce-chairs@ietf.org Subject: Re: PCEP as an SDN controller protocol? =20 Hi Daniele, [Operator hat on.] I agree on several things you wrote, starting from the answer to Jon's = rhetorical question, which cares more about how much (at least I've = never noticed my co-chair has a short memory). Nevertheless the sentence below needs to be corrected, because it = happens to be wrong: "optical networks with no control plane" is as = inaccurate as "a fuel car with no battery". Not relying on the high-end version of this mean to realize the core = task of an equipment must not hide that most (even those Sonet/SDH ADMs) = of the deployed optical devices do (mostly for management traffic, whose = fate PCEP may share)...: - perform IP forwarding, - have a routing table, - run an IGP to populate that routing table, - run an IGP to advertise their attached addresses, - support a large set of (IP-based) protocols for various purposes = (e.g., ICMP, DHCP, SSH, SMTP), i.e. squeezing many roles within a single = protocol is a non-goal. A possible rephrasing could be "networks where the control plane is = limited to background tasks", which reminds that operators deploy "fully = packaged cars", not just "raw wheels with a motor" according to the = misleading scope assumed in the current discussion. Thanks, Julien Jul. 24, 2017 - daniele.ceccarelli@ericsson.com: =C2=B7 It could be the SBI solution for those networks where = there is no control plane (e.g. many NMS driven optical networks) =20 ------=_NextPart_000_129A_01D3053D.65A2FA40 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I think it is all = slightly a distraction :-)

 

It is possible to run = an MCN without a routing protocol depending on the topology of the MCN. = Many MCNs can be achieved with relatively simple static = routes.

 

Statements (Haomian) = that optical devices cannot run BGP-LS seem to me to be an exaggeration. = I understand why they choose to not do it.

 

The use of BGP-LS or = PCEP-LS in a network where an IGP-TE is running may be excessive since = making a PCE a passive partner in an IGP is very cheap and = easy.

 

 

 

All of these things = are an aside to the deployment models being discussed. Those models are = more closely SDN-based, and that fact may be missing from the = conversation.

 

Consider a network = that runs without a horizontal control plane (i.e., no IGP-TE and no = signaling protocol). In this mode, devices are individually provisioned = from a controller using a protocol such as PCEP in a PCE-CC mode. The = controller-device communications run through an MCN, but that network = could be fairly simply constructed of P2P forwarding paths or (in the = case of an in-fiber MCN) by taking advantage of default static = routes.

 

In this network, the = question to address is "How does the PCE learn the topology of the = TE network?" I believe that at least some of the proponents of = PCEP-LS are suggesting that *each* NE can have a PCEP session that is = used not only for programming the NE for forwarding, but also for = reporting a fragment of the topology. In other words, PCEP-LS would be = used by *each* NE to report its local links. (Whether this assumes that = the NEs are running some form of discovery/verification protocol such as = LMP is maybe something we should also be talking = about.)

 

I find myself asking, = "How does an individual NE know its configuration? What identities = does it give to links? Where do those links connect to?" If that = information is pushed by configuration, couldn't that configuration = station push that information to the PCE as = well.

 

So maybe what is = needed to make this clear is a tiny little architecture statement? That = way people hearing "PCEP-LS" will not think "dump the = whole topology from a single node in the network" the way that we = have become accustomed to thinking with BGP-LS, but will see the picture = being solved and will understand the flow of = information.

 

Thanks,

Adrian

 

 

From: = Pce [mailto:pce-bounces@ietf.org] On Behalf Of Daniele = Ceccarelli
Sent: 25 July 2017 11:27
To: Julien = Meuric; pce@ietf.org
Cc: = pce-chairs@ietf.org
Subject: Re: [Pce] PCEP as an SDN = controller protocol?

 

HI Julien,

 

your correction is=E2=80=A6correct 😊

 

You=E2=80=99re referring to the protocols running on the DCN, or = more appropriately on the MCN, right? The IGP is usually non TE and just = providing reachability info=E2=80=A6but as PCEP can be modified for = other purposes, they can be modified as well. On this I agree with = you.

 

Cheers

Daniele   

 

From: Julien = Meuric [mailto:julien.meuric@orange.com]
Sent: marted=C3=AC = 25 luglio 2017 11:36
To: Daniele Ceccarelli = <daniele.ceccarelli@ericsson.com>; pce@ietf.org
Cc: = Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; = pce-chairs@ietf.org
Subject: Re: PCEP as an SDN controller = protocol?

 

Hi = Daniele,

[Operator hat on.]

I agree on several things you = wrote, starting from the answer to Jon's rhetorical question, which = cares more about how much (at least I've never noticed my co-chair has a = short memory).

Nevertheless the sentence below needs to be = corrected, because it happens to be wrong: "optical networks with = no control plane" is as inaccurate as "a fuel car with no = battery".
Not relying on the high-end version of this mean to = realize the core task of an equipment must not hide that most (even = those Sonet/SDH ADMs) of the deployed optical devices do (mostly for = management traffic, whose fate PCEP may share)...:
- perform IP = forwarding,
- have a routing table,
- run an IGP to populate that = routing table,
- run an IGP to advertise their attached = addresses,
- support a large set of (IP-based) protocols for various = purposes (e.g., ICMP, DHCP, SSH, SMTP), i.e. squeezing many roles within = a single protocol is a non-goal.

A possible rephrasing could be = "networks where the control plane is limited to background = tasks", which reminds that operators deploy "fully packaged = cars", not just "raw wheels with a motor" according to = the misleading scope assumed in the current = discussion.

Thanks,

Julien

=C2=B7=       =    It could be = the SBI solution for those networks where there is no control plane = (e.g. many NMS driven optical networks)

 

------=_NextPart_000_129A_01D3053D.65A2FA40-- From nobody Tue Jul 25 05:12:53 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A70CF131C8F; Tue, 25 Jul 2017 05:12:51 -0700 (PDT) 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, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id uPjJyHM0rOCx; Tue, 25 Jul 2017 05:12:43 -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 11E9B129A92; Tue, 25 Jul 2017 05:12:40 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml708-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DLG67113; Tue, 25 Jul 2017 12:12:38 +0000 (GMT) Received: from DGGEMI405-HUB.china.huawei.com (10.3.17.143) by lhreml708-cah.china.huawei.com (10.201.108.49) with Microsoft SMTP Server (TLS) id 14.3.301.0; Tue, 25 Jul 2017 13:12:36 +0100 Received: from DGGEMI512-MBX.china.huawei.com ([169.254.4.51]) by dggemi405-hub.china.huawei.com ([10.3.17.143]) with mapi id 14.03.0301.000; Tue, 25 Jul 2017 20:12:25 +0800 From: Mahendra Singh Negi To: "adrian@olddog.co.uk" , "'Julien Meuric'" , "'Jonathan Hardwick'" , "pce@ietf.org" , "Dhruv Dhody" CC: "draft-ietf-pce-lsp-setup-type@ietf.org" , "draft-ietf-pce-segment-routing@ietf.org" Thread-Topic: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Thread-Index: AdMCL6Ly08SduGL5TD6iP+F1jVMo6v//r6OAgAQU2wCAALGYAIAAsCkAgAA1EQCAACiSAP//Z+ZA Date: Tue, 25 Jul 2017 12:12:25 +0000 Message-ID: References: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> <127d01d30534$a47cb1b0$ed761510$@olddog.co.uk> In-Reply-To: <127d01d30534$a47cb1b0$ed761510$@olddog.co.uk> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.18.153.41] Content-Type: multipart/alternative; boundary="_000_B495DF531F7B5943B1816E2031125EF8A8420D89DGGEMI512MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0208.597735B7.005F, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.51, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: a65f9ddf47a4501275418bf8894b5977 Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 12:12:52 -0000 --_000_B495DF531F7B5943B1816E2031125EF8A8420D89DGGEMI512MBXchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear All, This is to answer on implantation row, apologies for the delayed response, = YES we do have our PCEP solutions deployed in mixed SR/RSVP-TE environment= s. I am afraid any non-backward compatible changes will break our solution. So= hope we choose a backward compatible solution. Regards, Mahendra (Huawei Tech India Pvt Ltd) From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Adrian Farrel Sent: 25 July 2017 16:26 To: 'Julien Meuric'; 'Jonathan Hardwick'; pce@ietf.org Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@= ietf.org Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Sighing slightly:-) If, as may be the case, there is a demand to make this work either as curre= ntly specified or to be seamlessly interoperable with what is already speci= fied then so be it. Let's make that as a conscious decision. However, I think that using 7120 as an "excuse" is a bad idea. What 7120 is= saying is that the allocated code point must show some stability in meanin= g from the point of early allocation on to RFC (just as it would need to if= the RFC was revised). But that is not saying that, upon noticing that we a= re a herd of lemmings rushing towards the cliff we must say "We have always= rushed towards the cliff. Our parents rushed towards the cliff. We must co= ntinue even if it means we plunge to our deaths." Of course, nothing so dramatic, but... If the current specification works well - stay with it. If the current specification works but is clumsy - tweak it in a backward c= ompatible way If the current specification is broken in a minor way - fix it in a backwar= d compatible way If the current specification is more seriously broken - burn a new code poi= nt to fix it In my earlier emails I was only speculating on "how I would have done this = if starting from scratch." Obviously (?) I should have participated in WG d= iscussions much earlier in the cycle, and as a result my opinion really onl= y counts if either: - the current specification is more seriously broken or - there is no WG desire to stick close to the current specification. Clearly, although people who implement against I-Ds are doing so at their o= wn risk, we should not unnecessarily burden early implementations with chan= ges just for the sake of change. There is a sliding scale of "better ways t= o do things" that incorporates "it's a bit messy," "it will be easier to ma= intain and extend," all the way up to "it's broken." The WG will want to wo= rk out where we are on that scale and weigh it against the cost and inconve= nience of change. Shipping in software may be one measure. Deployed and in = use is another measure. Cheers, Adrian From: Julien Meuric [mailto:julien.meuric@orange.com] Sent: 25 July 2017 09:31 To: Jonathan Hardwick; adrian@olddog.co.uk; pce= @ietf.org Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Hi, I agree that capability bitmap with optional capability-specific sub-TLVs w= ould be the way to go from scratch. However the SR-PCE-CAPABILITY already h= as an early allocated codepoint, and RFC 7120 says that "if there is a chan= ge, implementations based on the earlier and later specifications must be s= eamlessly interoperable." As a result, it seems to me that adding this new format may require that th= e I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reason= s. Cheers, Julien Jul. 25, 2017 - Jonathan.Hardwick@metaswitch.com: I agree that allowing optional sub-TLVs is a good thing. However, this str= ongly suggests that SR-PCE-CAPABILITY should become a sub-TLV, which is a n= on-backwards compatible change. So, we are back to my original question. Implementers - any views? Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 24 July 2017 19:51 Yes to that, Jon. But what happens when the next thing comes along? Since sub-TLVs can be present, I would suggest to use a Setup-Type TLV with= a bit map as I previously described in my email, and add optional sub-TLVs= dependent on the bits that are set. Isn't that the best of both worlds? Adrian From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitch.com] Sent: 24 July 2017 09:15 Adrian, The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also conta= ins information about the maximum SID depth. However, I like your idea and= I think that it gives us a better way to do this without breaking backward= s compatibility with existing SR implementations. Suppose we introduce a setup-type TLV into the OPEN object as you propose, = and assign a bit to each setup type. If the TLV is absent, then RSVP-TE is supported. If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE= and SR are supported. This retains backwards compatibility with existing = SR implementations. If the TLV is present, then the bits indicate which setup types are support= ed. We would modify the LSP setup type draft to say that implementations suppor= ting path setup types other than RSVP-TE SHOULD include the setup-type TLV. It's not exactly beautiful, but it's not as ugly as RSVP-TE-NON-SUPPORT. Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 21 July 2017 19:55 Well, personally, if I was designing this, I would not a whole TLV for each= bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is suppor= ted. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to= the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend o= n what implementations have done already. Adrian From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an import= ant decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker= to indicate that it can't (or won't) support RSVP-TE as a path setup type.= It is entirely plausible that a node might not support RSVP-TE, or else h= ave it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a sp= eaker to declare that they do or don't have support for RSVP-TE paths. The= re are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missin= g, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it= means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support = RSVP-TE. If this TLV is omitted, it will be assumed that they do support R= SVP-TE. The problem with (1) is that it is not backwards compatible. Any existing = SR implementation which also supports RSVP will not currently send this new= capability. So, if we make change (1) then forwards-level implementations= will incorrectly conclude that such backwards-level implementations do not= support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only d= o something ugly with a new protocol extension if we simply can't avoid doi= ng it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP= -TE environment that would be broken if we made change (1)? Thanks Jon --_000_B495DF531F7B5943B1816E2031125EF8A8420D89DGGEMI512MBXchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear All,

 

This is to answer on i= mplantation row, apologies for the delayed response,  YES we do have o= ur PCEP solutions deployed in mixed SR/RSVP-TE environments.

I am afraid any non-ba= ckward compatible changes will break our solution. So hope we choose a back= ward compatible solution.

Regards,

Mahendra (Huawei Tech = India Pvt Ltd)

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Adrian Farrel
Sent: 25 July 2017 16:26
To: 'Julien Meuric'; 'Jonathan Hardwick'; pce@ietf.org
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-r= outing@ietf.org
Subject: Re: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Sighing= slightly:-)

&n= bsp;

If, as = may be the case, there is a demand to make this work either as currently sp= ecified or to be seamlessly interoperable with what is already specified th= en so be it. Let's make that as a conscious decision.

&n= bsp;

However= , I think that using 7120 as an "excuse" is a bad idea. What 7120= is saying is that the allocated code point must show some stability in mea= ning from the point of early allocation on to RFC (just as it would need to if the RFC was revised). But that is not saying = that, upon noticing that we are a herd of lemmings rushing towards the clif= f we must say "We have always rushed towards the cliff. Our parents ru= shed towards the cliff. We must continue even if it means we plunge to our deaths."

&n= bsp;

Of cour= se, nothing so dramatic, but...

&n= bsp;

If the = current specification works well - stay with it.

If the = current specification works but is clumsy - tweak it in a backward compatib= le way

If the = current specification is broken in a minor way - fix it in a backward compa= tible way

If the = current specification is more seriously broken - burn a new code point to f= ix it

&n= bsp;

In my e= arlier emails I was only speculating on "how I would have done this if= starting from scratch." Obviously (?) I should have participated in W= G discussions much earlier in the cycle, and as a result my opinion really only counts if either:

- the c= urrent specification is more seriously broken

or=

- there= is no WG desire to stick close to the current specification.

&n= bsp;

Clearly= , although people who implement against I-Ds are doing so at their own risk= , we should not unnecessarily burden early implementations with changes jus= t for the sake of change. There is a sliding scale of "better ways to do things" that incorporates "it's= a bit messy," "it will be easier to maintain and extend," a= ll the way up to "it's broken." The WG will want to work out wher= e we are on that scale and weigh it against the cost and inconvenience of change. Shipping in software may be one measure. Deployed and in use is an= other measure.

&n= bsp;

Cheers,=

Adrian<= o:p>

&n= bsp;

From: Julien Meuric [mailto:julien.meuric@orange.com]
Sent: 25 July 2017 09:31
To: Jonathan Hardwick; adrian= @olddog.co.uk; pce@ietf.org
Cc: draft-= ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-s= egment-routing@ietf.org
Subject: Re: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

= Hi,

I agree that capability bitmap with optional capability-specific sub-TLVs w= ould be the way to go from scratch. However the SR-PCE-CAPABILITY already h= as an early allocated codepoint, and RFC 7120 says that "if there is a= change, implementations based on the earlier and later specifications must be seamlessly interoperable." As a result, it seems to me that adding this new format may require that th= e I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reason= s.

Cheers,

Julien

I agree= that allowing optional sub-TLVs is a good thing.  However, this stron= gly suggests that SR-PCE-CAPABILITY should become a sub-TLV, which is a non= -backwards compatible change.  So, we are back to my original question.

 <= /span>

Impleme= nters – any views?

 <= /span>

Cheers<= /span>

Jon

 <= /span>

 <= /span>

From: Adrian Farrel [mailto:adrian@olddog.co.uk]
Sent: 24 July 2017 19:51

 

Yes to = that, Jon. But what happens when the next thing comes along?

 <= /span>

Since s= ub-TLVs can be present, I would suggest to use a Setup-Type TLV with a bit = map as I previously described in my email, and add optional sub-TLVs depend= ent on the bits that are set.=

 <= /span>

Isn't t= hat the best of both worlds?<= /p>

 <= /span>

Adrian<= /span>

 <= /span>

From: Jonathan= Hardwick [mailto:Jonathan.Hardwick@metaswi= tch.com]
Sent: 24 July 2017 09:15

 

Adrian,=

 <= /span>

The SR-= PCE-CAPABILITY TLV is more than just a Boolean value - it also contains inf= ormation about the maximum SID depth.  However, I like your idea and I= think that it gives us a better way to do this without breaking backwards compatibility with existing SR implementat= ions.

 <= /span>

Suppose= we introduce a setup-type TLV into the OPEN object as you propose, and ass= ign a bit to each setup type.=

If the = TLV is absent, then RSVP-TE is supported.<= /o:p>

If the = TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR= are supported.  This retains backwards compatibility with existing SR= implementations.

If the = TLV is present, then the bits indicate which setup types are supported.

 <= /span>

We woul= d modify the LSP setup type draft to say that implementations supporting pa= th setup types other than RSVP-TE SHOULD include the setup-type TLV.=

 <= /span>

It̵= 7;s not exactly beautiful, but it’s not as ugly as RSVP-TE-NON-SUPPOR= T.

 <= /span>

Cheers<= /span>

Jon

 <= /span>

 <= /span>

From: Adrian Farrel [mailto:adrian@oldd= og.co.uk]
Sent: 21 July 2017 19:55

 

Well, p= ersonally, if I was designing this, I would not a whole TLV for each bit fl= ag!

I would= have a Setup-Type TLV.

If that= TLV is absent, RSVP-TE is supported.

If the = TLV is present, each bit means that a different setup type is supported.

 <= /span>

That me= ans...

Legacy = nodes don't include the TLV and are assumed to support RSVP-TE

Legacy = nodes that receive the TLV don't know what it means and so object to the Op= en (leaving a new node to re-Open for RSVP-TE only).

New nod= es include the TLV and so indicate explicitly what they support.

 <= /span>

I know = it is late for that type of change, so how we proceed might depend on what = implementations have done already.

 <= /span>

Adrian<= /span>

 <= /span>

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: 21 July 2017 16:07

 

Dear PCE-ers<= /p>

 

I don’t want to distract = from the SDN topic too much, but we have an important decision to make abou= t draft-ietf-pce-lsp-setup-type.

 

The shepherd review raised an i= ssue that there is no way for a PCEP speaker to indicate that it can’= t (or won’t) support RSVP-TE as a path setup type.  It is entire= ly plausible that a node might not support RSVP-TE, or else have it disabled, for example in an SR-only network.

 

We think that draft-ietf-pce-ls= p-setup-type should be changed to allow a speaker to declare that they do o= r don’t have support for RSVP-TE paths.  There are two proposals= .

 

1.      Change draft-ietf-pce-lsp-setup-type so that sp= eakers MUST include a (new) RSVP-TE-CAPABILITY TLV in their OPEN object.&nb= sp; If this TLV if missing, but some other CAPABILITY TLV is present (such = as SR-CAPABILITY) then it means that the speaker does not support RSVP-TE as a path setup type.

2.      Change draft-ietf-pce-lsp-setup-type so that sp= eakers MUST include a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if= they DON’T support RSVP-TE.  If this TLV is omitted, it will be= assumed that they do support RSVP-TE.

 

The problem with (1) is that it= is not backwards compatible.  Any existing SR implementation which al= so supports RSVP will not currently send this new capability.  So, if = we make change (1) then forwards-level implementations will incorrectly conclude that such backwards-level implementations do not= support RSVP-TE.

 

The problem with (2) is that it= is ugly, and in my opinion we should only do something ugly with a new pro= tocol extension if we simply can’t avoid doing it.<= /p>

 

And so the question: are there = any *deployments* of PCEP in a mixed SR/RSVP-TE environment that wou= ld be broken if we made change (1)?

 

Thanks

Jon

 

 

--_000_B495DF531F7B5943B1816E2031125EF8A8420D89DGGEMI512MBXchi_-- From nobody Tue Jul 25 05:50:00 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AA68513150C; Tue, 25 Jul 2017 05:49:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.618 X-Spam-Level: X-Spam-Status: No, score=-2.618 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cPBi3Vl20IZk; Tue, 25 Jul 2017 05:49:56 -0700 (PDT) Received: from relais-inet.orange.com (mta239.mail.business.static.orange.com [80.12.66.39]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1D259129AB2; Tue, 25 Jul 2017 05:49:56 -0700 (PDT) Received: from opfedar04.francetelecom.fr (unknown [xx.xx.xx.6]) by opfedar22.francetelecom.fr (ESMTP service) with ESMTP id CE2C6606A3; Tue, 25 Jul 2017 14:49:54 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.21]) by opfedar04.francetelecom.fr (ESMTP service) with ESMTP id 9900140065; Tue, 25 Jul 2017 14:49:54 +0200 (CEST) Received: from OPEXCLILMA4.corporate.adroot.infra.ftgroup ([fe80::65de:2f08:41e6:ebbe]) by OPEXCLILM6C.corporate.adroot.infra.ftgroup ([fe80::d9f5:9741:7525:a199%18]) with mapi id 14.03.0352.000; Tue, 25 Jul 2017 14:49:54 +0200 From: To: Igor Bryskin , Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgDDd6zgAAIgaYAAMk72kA== Date: Tue, 25 Jul 2017 12:49:53 +0000 Message-ID: <20903_1500986994_59773E72_20903_334_1_9E32478DFA9976438E7A22F69B08FF921EA056BE@OPEXCLILMA4.corporate.adroot.infra.ftgroup> References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> <0C72C38E7EBC34499E8A9E7DD007863909BB5465@SJCEML702-CHM.china.huawei.com> In-Reply-To: <0C72C38E7EBC34499E8A9E7DD007863909BB5465@SJCEML702-CHM.china.huawei.com> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.1] Content-Type: multipart/alternative; boundary="_000_9E32478DFA9976438E7A22F69B08FF921EA056BEOPEXCLILMA4corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 12:49:59 -0000 --_000_9E32478DFA9976438E7A22F69B08FF921EA056BEOPEXCLILMA4corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, You can use RESTCONF, NETCONF or anything similar (CLI ?) to provision path= s as you can do with PCEP. Nothing prevents to do that. Brgds, From: Igor Bryskin [mailto:Igor.Bryskin@huawei.com] Sent: Monday, July 24, 2017 14:53 To: LITKOWSKI Stephane OBS/OINIS; Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: RE: PCEP as an SDN controller protocol? Hi Stephanie, You said: < Why not limiting PCEP to path programming and path policies (traffic stee= ring on path...) ? But why not to use for these purposes RESTCONF or gRPC/protobuffs? Do you s= ee value in using explicit model based SBIs vs implicit (TLV-) based protoc= ols such as PCE? Cheers,, Igor From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@ora= nge.com Sent: Monday, July 24, 2017 8:03 AM To: Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? Hi, As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it's just bring a new kind o= f LSP style for this hop by hop path programming. A controller implementing= hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops... The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee :) ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I'm not sure that we need to mimic all features = in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with "limited scale": interesting when all= receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of= receivers need the same information Netconf more generic and point to point ... IMO: do we need PCEP-LS ? =3D> This can be discussed, we already have two protoc= ols to exchange the topology... do we need to add configuration capabilities in PCEP =3D> not sure, we have= Netconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path...) ? Brgds, From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon ___________________________________________________________________________= ______________________________________________ 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. ___________________________________________________________________________= ______________________________________________ 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_9E32478DFA9976438E7A22F69B08FF921EA056BEOPEXCLILMA4corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,<= /p>

 

You can use RESTCONF, = NETCONF or anything similar (CLI ?) to provision paths as you can do with P= CEP. Nothing prevents to do that.

 

Brgds,

 

From: Igor Bry= skin [mailto:Igor.Bryskin@huawei.com]
Sent: Monday, July 24, 2017 14:53
To: LITKOWSKI Stephane OBS/OINIS; Jonathan Hardwick; pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: RE: PCEP as an SDN controller protocol?

 

Hi Stephanie,

 

You said:

< Why not limiting = PCEP to path programming and path policies (traffic steering on path…= ) ?

 

But why not to use for= these purposes RESTCONF or gRPC/protobuffs? Do you see value in using expl= icit model based SBIs vs implicit (TLV-) based protocols such as  PCE?=

 

Cheers,,

Igor=

 

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stepha= ne.litkowski@orange.com
Sent: Monday, July 24, 2017 8:03 AM
To: Jonathan Hardwick; pce@ietf.org<= /a>
Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol?

 

Hi,<= /p>

 

As soon as we started = with the active stateful PCE, the PCE became an SDN controller who takes de= cision and programs the network.

So as many already men= tioned, PCEP as an SBI is already done.


IMO, PCECC does not change significantly PCEP, it’s just bring a new = kind of LSP style for this hop by hop path programming. A controller implem= enting hop by hop path programming will require more intelligence as it nee= ds to program nodes in the right order to prevent transient loops…

 

The question is more w= hat is the exact scope of PCEP in term of SBI and do we want to create a pr= otocol that does everything , including coffee J ?

We already have plenty= of protocols: BGP, IGP, Netconf. Each protocol has strength and weaknesses= and I’m not sure that we need to mimic all features in all protocols= . What is the gain here ?

The best approach may = be to use strength of protocols and use them for what they are good for:

Example:

IGP has good flooding = capability with “limited scale”: interesting when all receivers= need the same information

BGP has good flooding = capability with large scale and ability to target specific groups (using ro= ute targets/communities) : interesting when groups of receivers need the sa= me information

Netconf more generic a= nd point to point

…

 

 

IMO:

do we need PCEP-LS ? = =3D> This can be discussed, we already have two protocols to exchange th= e topology…

do we need to add conf= iguration capabilities in PCEP =3D> not sure, we have Netconf for that.<= o:p>

Why not limiting PCEP = to path programming and path policies (traffic steering on path…) ?

 

Brgds,

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol?=

 

Dear PCE WG

 

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

 

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP – capabilities that are tr= aditionally part of routing and signalling.  There were three examples= of this in the PCE working group meeting this week.

·        The PCECC proposal, which extends PCEP’s = path instantiation capability so that the PCE can provision a path end-to-e= nd by touching each hop along the path.  This replaces the function al= ready provided by RSVP-TE.

·        The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.  This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

·        The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.  Again, this replaces functions that = are already designed into the IGPs.

 

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.  PCEP is used to communicate the current network state and to program flows.  These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.  TEAS is very much assuming that this is the directi= on that we want to take PCEP in.  However, there are two procedural issues, as I see it.

1.      We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.  We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the “thin end of the wedge”.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.      We do not currently have a charter that allows = us to add this type of capability to PCEP.  Depending on the outcome o= f discussion (1), we can of course extend the charter.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

 

I am hoping to get more than ju= st “yes” or “no” answers to this question (although= that would be better than no answer).  I would like to hear justifica= tions for or against.  Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational probl= ems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

______________________________________________________________________=
___________________________________________________
 
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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 messag=
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Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.
 
This message and its attachments may contain confidential or privilege=
d information that may be protected by law;
they should not be distributed, used or copied without authorisation.<=
o:p>
If you have received this email in error, please notify the sender and=
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been modified, changed or falsified.
Thank you.
______________________________________________________________________=
___________________________________________________

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.
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Tue, 25 Jul 2017 14:27:06 +0000 To: Jonathan Hardwick , "pce@ietf.org" Cc: "pce-chairs@ietf.org" References: From: Dieter Beller Organization: Nokia Message-ID: <388bd5f5-6f19-d184-10ee-c6be9025efb7@nokia.com> Date: Tue, 25 Jul 2017 16:27:03 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/html; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Originating-IP: [135.245.212.1] X-ClientProxiedBy: AM5P189CA0002.EURP189.PROD.OUTLOOK.COM (2603:10a6:206:15::15) To AM5PR0701MB1828.eurprd07.prod.outlook.com (2603:10a6:203:1d::13) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 57087929-fb51-42bc-159a-08d4d3693a6f X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(300000503095)(300135400095)(48565401081)(201703131423075)(201703031133081)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); 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X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 14:27:12 -0000 Hi Jon, all,

I do have strong concerns to extend PCEP as described in the e-mail below:

Currently, IETF is working on YANG models covering TE-topology as well as TE-tunnels. This means that the NETCONF protocol can be used to
retrieve local topology information including link state information for the links connecting the node with its immediate neighbors. This information
can be used by the NETCONF client (could be an SDN controller) to put the entire TE-topology of a domain together.

As far as connection control is concerned, NETCONF can also be used to either establish an e2e connections by configuring all nodes along the
the path or NETCONF can trigger connection establishment in the source node in case a GMPLS control plane is in place and RSVP-TE signaling
will be used for setting up the LSP. There is no obvious reason why PCEP would have any advantages over NETCONF/YANG. Introducing an
additional protocol supporting almost the same functionality will certainly not be helpful for the industry because vendors will have to implement
and test an additional protocol.


Thanks,
Dieter


On 20.07.2017 17:22, Jonathan Hardwick wrote:

Dear PCE WG

The purpose of this email is to initiate a discussion about whether we want to extend PCEP to allow it to replace the functions that are traditionally provided by the routing and signalling protocols.

Originally, PCEP was designed with the goal of providing a distributed path computation service. In recent years we have extended that mission, and added path modification and path instantiation capabilities to PCEP. This has added capabilities to PCEP that would traditionally have been performed by the network management plane.

We are now starting to discuss proposals to add more capabilities to PCEP capabilities that are traditionally part of routing and signalling. There were three examples of this in the PCE working group meeting this week.

The PCECC proposal, which extends PCEPs path instantiation capability so that the PCE can provision a path end-to-end by touching each hop along the path. This replaces the function already provided by RSVP-TE.

The PCEP-LS proposal, which extends PCEP to allow link state and TE information to be communicated from the network to the PCE. This replaces the link state flooding function provided by the IGPs, or BGP-LS.

The PCECC-SR proposal extends PCEP to allow device-level configuration to be communicated between the network and the PCE, such as SRGBs, prefix SIDs etc. Again, this replaces functions that are already designed into the IGPs.

These proposals are taking PCEP in the direction of being a fully-fledged SDN protocol. With these proposals, one can envision a network in which there is no traditional control plane. PCEP is used to communicate the current network state and to program flows. These proposals have their roots in the ACTN and PCECC architectures that are adopted within the TEAS working group. TEAS is very much assuming that this is the direction that we want to take PCEP in. However, there are two procedural issues, as I see it.

1. We have not had an explicit discussion in the PCE WG about whether we want to take PCEP in this direction. We have had a few lively debates on specific cases, like PCEP-LS, but those cases represent the thin end of the wedge. If we start down this path then we are accepting that PCEP will replace the functions available in the traditional control plane. We need to test whether there is a consensus in the working group to move in that direction.

2. We do not currently have a charter that allows us to add this type of capability to PCEP. Depending on the outcome of discussion (1), we can of course extend the charter.

This email is to initiate the discussion (1). So, please reply to the mailing list and share your thoughts on whether PCEP should be extended in this direction, and how far we should go.

I am hoping to get more than just yes or no answers to this question (although that would be better than no answer). I would like to hear justifications for or against. Such as, which production networks would run PCEP in place of a traditional control plane? Why is it not desirable to solve the problems in those networks with the traditional control plane? What harm could this do? What would be the operational problems associated with adding these functions to PCEP?

Many thanks

Jon



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X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 14:52:52 -0000 --_000_DB3PR07MB0588E771F55A7BD04F6E413491B80DB3PR07MB0588eurp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Jon, all Looking at the mail below, it seems as though you derive needs to extend PC= EP , from the fact PCEP can be consider as having a root role in ACTN conte= xt. Well, while ACTN does not mandate any protocol specific in his architecture= , the basic toolset to operate ACTN architecture is based on NETCON/YANG m= odel, as well described in the draft https://datatracker.ietf.org/doc/draft= -zhang-teas-actn-yang/ . Topology model is used at MPI level to get topolog= y information augmented with needed technology specific information and Tu= nnel model (and related technology specific augmentation) is used to creat= e tunnel inside the network , for CMI,VN Yang model is used to specificall= y operate on VN. No mandatory need for PCEP extension to cover ACTN functio= nality, so I have a clear concern to go ahead with this request of PCEP ext= ension as described in this mail. Thanks Sergio From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 5:22 PM To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabilit= y so that the PCE can provision a path end-to-end by touching each hop alon= g the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and TE i= nformation to be communicated from the network to the PCE. This replaces t= he link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configuratio= n to be communicated between the network and the PCE, such as SRGBs, prefix= SIDs etc. Again, this replaces functions that are already designed into t= he IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether we= want to take PCEP in this direction. We have had a few lively debates on = specific cases, like PCEP-LS, but those cases represent the "thin end of th= e wedge". If we start down this path then we are accepting that PCEP will = replace the functions available in the traditional control plane. We need = to test whether there is a consensus in the working group to move in that d= irection. 2. We do not currently have a charter that allows us to add this type of= capability to PCEP. Depending on the outcome of discussion (1), we can of= course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon --_000_DB3PR07MB0588E771F55A7BD04F6E413491B80DB3PR07MB0588eurp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Jon, all

 

Looking at the mail below, it seems as though you de= rive needs to extend PCEP , from the fact PCEP can be consider as having a = root role in ACTN context.

Well, while ACTN does not mandate any protocol speci= fic in his architecture, the basic toolset  to operate ACTN architectu= re is based on NETCON/YANG model, as well described in the draft ht= tps://datatracker.ietf.org/doc/draft-zhang-teas-actn-yang/ . Topology m= odel is used at MPI level to get topology information augmented with needed= technology specific information  and Tunnel model  (and related technology specific augmentation) is used = to create tunnel inside the network ,  for CMI,VN Yang model is used t= o specifically operate on VN. No mandatory need for PCEP extension to cover= ACTN functionality, so I have a clear concern to go ahead with this request of PCEP extension as described in this mail.=

 

Thanks

Sergio

 

From: Pce [mailto:pce-bounces@ietf.org] On= Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 5:22 PM
To: pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?

 

Dear PCE WG

 

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

 

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP – capabilities that are tr= aditionally part of routing and signalling.  There were three examples= of this in the PCE working group meeting this week.

  • The PCECC proposal, which extends PCEP’s p= ath instantiation capability so that the PCE can provision a path end-to-en= d by touching each hop along the path.  This replaces the function already provided by RSVP-TE.
    • <= li class=3D"MsoListParagraph" style=3D"margin-left:0in;mso-list:l0 level1 l= fo2">The PCEP-LS proposal, which extends PCEP to allow= link state and TE information to be communicated from the network to the P= CE.  This replaces the link state flooding function provided by the IGPs, or BGP-LS.
  • The PCECC-SR proposal extends PCEP to allow device-level = configuration to be communicated between the network and the PCE, such as S= RGBs, prefix SIDs etc.  Again, this replaces functions that are already designed into the IGPs.

 

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.  PCEP is used to communicate the current network state and to program flows.  These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.  TEAS is very much assuming that this is the directi= on that we want to take PCEP in.  However, there are two procedural issues, as I see it.

  1. We have not had an explicit discussion in the PC= E WG about whether we want to take PCEP in this direction.  We have ha= d a few lively debates on specific cases, like PCEP-LS, but those cases represent the “thin end of the wedge”= .  If we start down this path then we are accepting that PCEP will rep= lace the functions available in the traditional control plane.  We nee= d to test whether there is a consensus in the working group to move in that direction.
  2. We do not currently have a charter that allows us to add this type = of capability to PCEP.  Depending on the outcome of discussion (1), we= can of course extend the charter.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

 

I am hoping to get more than ju= st “yes” or “no” answers to this question (although= that would be better than no answer).  I would like to hear justifica= tions for or against.  Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational probl= ems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

--_000_DB3PR07MB0588E771F55A7BD04F6E413491B80DB3PR07MB0588eurp_-- From nobody Tue Jul 25 08:01:30 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5C20413188D; Tue, 25 Jul 2017 08:01:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.22 X-Spam-Level: X-Spam-Status: No, score=-4.22 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cxZIH78nnY9n; Tue, 25 Jul 2017 08:01:26 -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 9C6B4131CED; Tue, 25 Jul 2017 08:01:25 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml704-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DLG95514; Tue, 25 Jul 2017 15:01:23 +0000 (GMT) Received: from SJCEML701-CHM.china.huawei.com (10.208.112.40) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.301.0; Tue, 25 Jul 2017 16:01:22 +0100 Received: from SJCEML702-CHM.china.huawei.com ([169.254.4.153]) by SJCEML701-CHM.china.huawei.com ([169.254.3.13]) with mapi id 14.03.0301.000; Tue, 25 Jul 2017 08:01:16 -0700 From: Igor Bryskin To: "stephane.litkowski@orange.com" , Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? Thread-Index: AdMBZDe3oIUEH6WSTDKg6cZRmOEpYgDDd6zgAAIgaYAAMk72kAAETriA Date: Tue, 25 Jul 2017 15:01:15 +0000 Message-ID: <0C72C38E7EBC34499E8A9E7DD007863909BB8394@SJCEML702-CHM.china.huawei.com> References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> <0C72C38E7EBC34499E8A9E7DD007863909BB5465@SJCEML702-CHM.china.huawei.com> <20903_1500986994_59773E72_20903_334_1_9E32478DFA9976438E7A22F69B08FF921EA056BE@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: <20903_1500986994_59773E72_20903_334_1_9E32478DFA9976438E7A22F69B08FF921EA056BE@OPEXCLILMA4.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.148.2] Content-Type: multipart/alternative; boundary="_000_0C72C38E7EBC34499E8A9E7DD007863909BB8394SJCEML702CHMchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020201.59775D44.017A, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.153, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 46445f171ac639844abf3e0684adfa8c Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 15:01:29 -0000 --_000_0C72C38E7EBC34499E8A9E7DD007863909BB8394SJCEML702CHMchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Stephanie, You said that there are better ways to extract topologies and configure thi= ngs than using PCEP. You forgot to mention the issue of collecting telemetry and I hope you are = not suggesting using PCEP for that. In fact, it is widely accepted that the= best way to go about the telemetry collection is via using gRPC/protobufs.= Considering that: a) gRPC can do all other things , including path provisioning on the d= evices, policy pushing, topology discovery/configuration at least as well a= s any other tool you mentioned (in fact, I believe far better); b) Daniele's point of operators requiring a single tool for all network= control purposes; c) gRPC being very well documented and tested open source project, ada= ptable for big and small systems/devices could you give a reason, why not to go with gRPC in the long term (and REST= CONF in the short term) ? Cheers, Igor From: stephane.litkowski@orange.com [mailto:stephane.litkowski@orange.com] Sent: Tuesday, July 25, 2017 8:50 AM To: Igor Bryskin; Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: RE: PCEP as an SDN controller protocol? Hi, You can use RESTCONF, NETCONF or anything similar (CLI ?) to provision path= s as you can do with PCEP. Nothing prevents to do that. Brgds, From: Igor Bryskin [mailto:Igor.Bryskin@huawei.com] Sent: Monday, July 24, 2017 14:53 To: LITKOWSKI Stephane OBS/OINIS; Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: RE: PCEP as an SDN controller protocol? Hi Stephanie, You said: < Why not limiting PCEP to path programming and path policies (traffic stee= ring on path...) ? But why not to use for these purposes RESTCONF or gRPC/protobuffs? Do you s= ee value in using explicit model based SBIs vs implicit (TLV-) based protoc= ols such as PCE? Cheers,, Igor From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stephane.litkowski@ora= nge.com Sent: Monday, July 24, 2017 8:03 AM To: Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? Hi, As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it's just bring a new kind o= f LSP style for this hop by hop path programming. A controller implementing= hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops... The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee :) ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I'm not sure that we need to mimic all features = in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with "limited scale": interesting when all= receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of= receivers need the same information Netconf more generic and point to point ... IMO: do we need PCEP-LS ? =3D> This can be discussed, we already have two protoc= ols to exchange the topology... do we need to add configuration capabilities in PCEP =3D> not sure, we have= Netconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path...) ? Brgds, From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabi= lity so that the PCE can provision a path end-to-end by touching each hop a= long the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and T= E information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configura= tion to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the "thin end of = the wedge". If we start down this path then we are accepting that PCEP wil= l replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon ___________________________________________________________________________= ______________________________________________ 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. ___________________________________________________________________________= ______________________________________________ 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_0C72C38E7EBC34499E8A9E7DD007863909BB8394SJCEML702CHMchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Stephanie,<= /span>

 

You said that there ar= e better ways to extract topologies and configure things than using PCEP.

 

You forgot to mention = the issue of collecting telemetry and I hope you are not suggesting using P= CEP for that. In fact, it is widely accepted that the best way to go about = the telemetry collection is via using gRPC/protobufs. Considering that:

a)&n= bsp;     gRPC can do al= l other things , including path provisioning on the devices, policy pushing= , topology discovery/configuration at least as well as any other tool you m= entioned (in fact, I believe far better);

b)&n= bsp;    Daniele’= s point of operators requiring a single tool for all network control purpos= es;

c)&n= bsp;     gRPC being ver= y well documented and tested open source project, adaptable for big and sma= ll systems/devices

could you give a reaso= n, why not to go with gRPC in the long term (and RESTCONF in the short term= ) ?

 

Cheers,

Igor=

 

From: stephane= .litkowski@orange.com [mailto:stephane.litkowski@orange.com]
Sent: Tuesday, July 25, 2017 8:50 AM
To: Igor Bryskin; Jonathan Hardwick; pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: RE: PCEP as an SDN controller protocol?

 

Hi,<= /p>

 

You can use RESTCONF, = NETCONF or anything similar (CLI ?) to provision paths as you can do with P= CEP. Nothing prevents to do that.

 

Brgds,

 

From: Igor Bry= skin [mailto:Igor.Bryskin@huawei.com]
Sent: Monday, July 24, 2017 14:53
To: LITKOWSKI Stephane OBS/OINIS; Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org
Subject: RE: PCEP as an SDN controller protocol?

 

Hi Stephanie,

 

You said:

< Why not limiting = PCEP to path programming and path policies (traffic steering on path…= ) ?

 

But why not to use for= these purposes RESTCONF or gRPC/protobuffs? Do you see value in using expl= icit model based SBIs vs implicit (TLV-) based protocols such as  PCE?=

 

Cheers,,

Igor=

 

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of stepha= ne.litkowski@orange.com
Sent: Monday, July 24, 2017 8:03 AM
To: Jonathan Hardwick; pce@ietf.org<= /a>
Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol?

 

Hi,<= /p>

 

As soon as we started = with the active stateful PCE, the PCE became an SDN controller who takes de= cision and programs the network.

So as many already men= tioned, PCEP as an SBI is already done.


IMO, PCECC does not change significantly PCEP, it’s just bring a new = kind of LSP style for this hop by hop path programming. A controller implem= enting hop by hop path programming will require more intelligence as it nee= ds to program nodes in the right order to prevent transient loops…

 

The question is more w= hat is the exact scope of PCEP in term of SBI and do we want to create a pr= otocol that does everything , including coffee J ?

We already have plenty= of protocols: BGP, IGP, Netconf. Each protocol has strength and weaknesses= and I’m not sure that we need to mimic all features in all protocols= . What is the gain here ?

The best approach may = be to use strength of protocols and use them for what they are good for:

Example:

IGP has good flooding = capability with “limited scale”: interesting when all receivers= need the same information

BGP has good flooding = capability with large scale and ability to target specific groups (using ro= ute targets/communities) : interesting when groups of receivers need the sa= me information

Netconf more generic a= nd point to point

…

 

 

IMO:

do we need PCEP-LS ? = =3D> This can be discussed, we already have two protocols to exchange th= e topology…

do we need to add conf= iguration capabilities in PCEP =3D> not sure, we have Netconf for that.<= o:p>

Why not limiting PCEP = to path programming and path policies (traffic steering on path…) ?

 

Brgds,

 

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol?=

 

Dear PCE WG

 

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

 

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP – capabilities that are tr= aditionally part of routing and signalling.  There were three examples= of this in the PCE working group meeting this week.

·        The PCECC proposal, which extends PCEP’s = path instantiation capability so that the PCE can provision a path end-to-e= nd by touching each hop along the path.  This replaces the function al= ready provided by RSVP-TE.

·        The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.  This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

·        The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.  Again, this replaces functions that = are already designed into the IGPs.

 

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.  PCEP is used to communicate the current network state and to program flows.  These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.  TEAS is very much assuming that this is the directi= on that we want to take PCEP in.  However, there are two procedural issues, as I see it.

1.      We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.  We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the “thin end of the wedge”.  If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.  We need to test = whether there is a consensus in the working group to move in that direction= .

2.      We do not currently have a charter that allows = us to add this type of capability to PCEP.  Depending on the outcome o= f discussion (1), we can of course extend the charter.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

 

I am hoping to get more than ju= st “yes” or “no” answers to this question (although= that would be better than no answer).  I would like to hear justifica= tions for or against.  Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational probl= ems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

______________________________________________________________________=
___________________________________________________
 
Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles 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 messag=
es electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.
 
This message and its attachments may contain confidential or privilege=
d information that may be protected by law;
they should not be distributed, used or copied without authorisation.<=
o:p>
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.
______________________________________________________________________=
___________________________________________________
 
Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles 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 messag=
es electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.
 
This message and its attachments may contain confidential or privilege=
d information that may be protected by law;
they should not be distributed, used or copied without authorisation.<=
o:p>
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.
--_000_0C72C38E7EBC34499E8A9E7DD007863909BB8394SJCEML702CHMchi_-- From nobody Tue Jul 25 08:04:04 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6D1F13167B; Tue, 25 Jul 2017 08:04:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.79 X-Spam-Level: X-Spam-Status: No, score=-4.79 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-2.8, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=metaswitch.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ToopR84dO9Yx; Tue, 25 Jul 2017 08:03:59 -0700 (PDT) Received: from NAM02-BL2-obe.outbound.protection.outlook.com (mail-bl2nam02on0110.outbound.protection.outlook.com [104.47.38.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1B1F6127B60; Tue, 25 Jul 2017 08:03:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=metaswitch.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=wXXa9ntc6jS9v4pmq1YM/BDO8KTrYwvnA0wHTNgj/Rg=; b=EzGvQNaQPn9xDnPXYqXZJAG3k4mcbw3yyYoHv1oQLtjQRbpgGJ8Nr+EhzAqT6aOw8wAIx5//MpQW7H0P4Qq456S3RG0OlYLcNMBne+6CQOFstFqFSCBSXfY72IFrvKjq3vUHwU4nYs/4KHfJh2Pfw3YB+hWsBKhSOvH1ySH5yBc= Received: from BY2PR0201MB1910.namprd02.prod.outlook.com (10.163.75.152) by BY2PR0201MB1909.namprd02.prod.outlook.com (10.163.75.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1282.10; Tue, 25 Jul 2017 15:03:55 +0000 Received: from BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) by BY2PR0201MB1910.namprd02.prod.outlook.com ([10.163.75.152]) with mapi id 15.01.1282.020; Tue, 25 Jul 2017 15:03:55 +0000 From: Jonathan Hardwick To: Mahendra Singh Negi , "adrian@olddog.co.uk" , 'Julien Meuric' , "pce@ietf.org" , Dhruv Dhody CC: "draft-ietf-pce-lsp-setup-type@ietf.org" , "draft-ietf-pce-segment-routing@ietf.org" Thread-Topic: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Thread-Index: AdMCL6Ly08SduGL5TD6iP+F1jVMo6gLb6Lt6AoGNBjECUAnrYAH07KFjARW4HJ+jLz7AQNyBH2SA///ZoFA= Date: Tue, 25 Jul 2017 15:03:55 +0000 Message-ID: References: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> <127d01d30534$a47cb1b0$ed761510$@olddog.co.uk> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Jonathan.Hardwick@metaswitch.com; x-originating-ip: [86.132.73.220] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; BY2PR0201MB1909; 7: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 x-ms-office365-filtering-correlation-id: 93df4125-90b1-4129-7735-08d4d36e5ed8 x-microsoft-antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254075)(300000503095)(300135400095)(2017052603031)(201703131423075)(201703031133081)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); SRVR:BY2PR0201MB1909; x-ms-traffictypediagnostic: BY2PR0201MB1909: x-exchange-antispam-report-test: UriScan:(50582790962513)(18271650672692)(21748063052155); x-microsoft-antispam-prvs: x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(100000700101)(100105000095)(100000701101)(100105300095)(100000702101)(100105100095)(6040450)(601004)(2401047)(8121501046)(5005006)(93006095)(93001095)(100000703101)(100105400095)(3002001)(10201501046)(6041248)(20161123555025)(20161123564025)(201703131423075)(201702281528075)(201703061421075)(201703061406153)(20161123558100)(20161123560025)(20161123562025)(6072148)(100000704101)(100105200095)(100000705101)(100105500095); SRVR:BY2PR0201MB1909; BCL:0; PCL:0; RULEID:(100000800101)(100110000095)(100000801101)(100110300095)(100000802101)(100110100095)(100000803101)(100110400095)(100000804101)(100110200095)(100000805101)(100110500095); SRVR:BY2PR0201MB1909; x-forefront-prvs: 03793408BA x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(39840400002)(39450400003)(39400400002)(39850400002)(39410400002)(66654002)(51444003)(199003)(189002)(37854004)(5660300001)(33656002)(101416001)(561944003)(54906002)(6246003)(6306002)(54896002)(189998001)(93886004)(76176999)(54356999)(6506006)(38730400002)(55016002)(790700001)(53546010)(7736002)(230783001)(77096006)(2900100001)(6116002)(3846002)(3660700001)(105586002)(106356001)(50986999)(99286003)(4326008)(66066001)(53936002)(86362001)(25786009)(102836003)(72206003)(236005)(8676002)(2950100002)(9686003)(3280700002)(8936002)(6436002)(97736004)(2501003)(74316002)(478600001)(2906002)(7696004)(68736007)(81166006)(81156014)(14454004)(229853002); DIR:OUT; SFP:1102; SCL:1; SRVR:BY2PR0201MB1909; H:BY2PR0201MB1910.namprd02.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: metaswitch.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: multipart/alternative; boundary="_000_BY2PR0201MB1910141F84413E6EF976DF1684B80BY2PR0201MB1910_" MIME-Version: 1.0 X-OriginatorOrg: metaswitch.com X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Jul 2017 15:03:55.5338 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9d9e56eb-f613-4ddb-b27b-bfcdf14b2cdb X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR0201MB1909 Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 15:04:03 -0000 --_000_BY2PR0201MB1910141F84413E6EF976DF1684B80BY2PR0201MB1910_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Mahendra, many thanks for your input. PCE WG, we have a backwards compatible proposal on the table which, apart f= rom making a special case of SR-PCE-CAPABILITY, seems reasonably clean (or,= at least, not seriously broken). Shall we go forwards with that? Best regards Jon From: Mahendra Singh Negi [mailto:mahendrasingh@huawei.com] Sent: 25 July 2017 13:12 To: adrian@olddog.co.uk; 'Julien Meuric' ; Jonath= an Hardwick ; pce@ietf.org; Dhruv Dhody <= dhruv.dhody@huawei.com> Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@= ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Dear All, This is to answer on implantation row, apologies for the delayed response, = YES we do have our PCEP solutions deployed in mixed SR/RSVP-TE environment= s. I am afraid any non-backward compatible changes will break our solution. So= hope we choose a backward compatible solution. Regards, Mahendra (Huawei Tech India Pvt Ltd) From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Adrian Farrel Sent: 25 July 2017 16:26 To: 'Julien Meuric'; 'Jonathan Hardwick'; pce@ietf.org Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Sighing slightly:-) If, as may be the case, there is a demand to make this work either as curre= ntly specified or to be seamlessly interoperable with what is already speci= fied then so be it. Let's make that as a conscious decision. However, I think that using 7120 as an "excuse" is a bad idea. What 7120 is= saying is that the allocated code point must show some stability in meanin= g from the point of early allocation on to RFC (just as it would need to if= the RFC was revised). But that is not saying that, upon noticing that we a= re a herd of lemmings rushing towards the cliff we must say "We have always= rushed towards the cliff. Our parents rushed towards the cliff. We must co= ntinue even if it means we plunge to our deaths." Of course, nothing so dramatic, but... If the current specification works well - stay with it. If the current specification works but is clumsy - tweak it in a backward c= ompatible way If the current specification is broken in a minor way - fix it in a backwar= d compatible way If the current specification is more seriously broken - burn a new code poi= nt to fix it In my earlier emails I was only speculating on "how I would have done this = if starting from scratch." Obviously (?) I should have participated in WG d= iscussions much earlier in the cycle, and as a result my opinion really onl= y counts if either: - the current specification is more seriously broken or - there is no WG desire to stick close to the current specification. Clearly, although people who implement against I-Ds are doing so at their o= wn risk, we should not unnecessarily burden early implementations with chan= ges just for the sake of change. There is a sliding scale of "better ways t= o do things" that incorporates "it's a bit messy," "it will be easier to ma= intain and extend," all the way up to "it's broken." The WG will want to wo= rk out where we are on that scale and weigh it against the cost and inconve= nience of change. Shipping in software may be one measure. Deployed and in = use is another measure. Cheers, Adrian From: Julien Meuric [mailto:julien.meuric@orange.com] Sent: 25 July 2017 09:31 To: Jonathan Hardwick; adrian@olddog.co.uk; pce= @ietf.org Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Hi, I agree that capability bitmap with optional capability-specific sub-TLVs w= ould be the way to go from scratch. However the SR-PCE-CAPABILITY already h= as an early allocated codepoint, and RFC 7120 says that "if there is a chan= ge, implementations based on the earlier and later specifications must be s= eamlessly interoperable." As a result, it seems to me that adding this new format may require that th= e I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reason= s. Cheers, Julien Jul. 25, 2017 - Jonathan.Hardwick@metaswitch.com: I agree that allowing optional sub-TLVs is a good thing. However, this str= ongly suggests that SR-PCE-CAPABILITY should become a sub-TLV, which is a n= on-backwards compatible change. So, we are back to my original question. Implementers - any views? Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 24 July 2017 19:51 Yes to that, Jon. But what happens when the next thing comes along? Since sub-TLVs can be present, I would suggest to use a Setup-Type TLV with= a bit map as I previously described in my email, and add optional sub-TLVs= dependent on the bits that are set. Isn't that the best of both worlds? Adrian From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitch.com] Sent: 24 July 2017 09:15 Adrian, The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also conta= ins information about the maximum SID depth. However, I like your idea and= I think that it gives us a better way to do this without breaking backward= s compatibility with existing SR implementations. Suppose we introduce a setup-type TLV into the OPEN object as you propose, = and assign a bit to each setup type. If the TLV is absent, then RSVP-TE is supported. If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE= and SR are supported. This retains backwards compatibility with existing = SR implementations. If the TLV is present, then the bits indicate which setup types are support= ed. We would modify the LSP setup type draft to say that implementations suppor= ting path setup types other than RSVP-TE SHOULD include the setup-type TLV. It's not exactly beautiful, but it's not as ugly as RSVP-TE-NON-SUPPORT. Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 21 July 2017 19:55 Well, personally, if I was designing this, I would not a whole TLV for each= bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is suppor= ted. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to= the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend o= n what implementations have done already. Adrian From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 Dear PCE-ers I don't want to distract from the SDN topic too much, but we have an import= ant decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker= to indicate that it can't (or won't) support RSVP-TE as a path setup type.= It is entirely plausible that a node might not support RSVP-TE, or else h= ave it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a sp= eaker to declare that they do or don't have support for RSVP-TE paths. The= re are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missin= g, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it= means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON'T support = RSVP-TE. If this TLV is omitted, it will be assumed that they do support R= SVP-TE. The problem with (1) is that it is not backwards compatible. Any existing = SR implementation which also supports RSVP will not currently send this new= capability. So, if we make change (1) then forwards-level implementations= will incorrectly conclude that such backwards-level implementations do not= support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only d= o something ugly with a new protocol extension if we simply can't avoid doi= ng it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP= -TE environment that would be broken if we made change (1)? Thanks Jon --_000_BY2PR0201MB1910141F84413E6EF976DF1684B80BY2PR0201MB1910_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Mahendra, many thanks for your input.

 

PCE WG, we have a backwards compatible proposal on the table which, ap= art from making a special case of SR-PCE-CAPABILITY, seems reasonably clean= (or, at least, not seriously broken).  Shall we go forwards with that?

 

Best regards

Jon

 

 

F= rom: Mahendra Si= ngh Negi [mailto:mahendrasingh@huawei.com]
Sent: 25 July 2017 13:12
To: adrian@olddog.co.uk; 'Julien Meuric' <julien.meuric@orange.co= m>; Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; pce@ietf= .org; Dhruv Dhody <dhruv.dhody@huawei.com>
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-r= outing@ietf.org
Subject: RE: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Dear All,

 

This is to answer o= n implantation row, apologies for the delayed response,  YES we do hav= e our PCEP solutions deployed in mixed SR/RSVP-TE environments.<= /span>

I am afraid any non= -backward compatible changes will break our solution. So hope we choose a b= ackward compatible solution.

 

Regards,=

Mahendra (Huawei Te= ch India Pvt Ltd)

&n= bsp;

From:<= span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Tahoma"= ;,sans-serif;color:windowtext"> Pce [mailto:pce-bounces@ietf.org] On Behalf Of Adrian Farrel
Sent: 25 July 2017 16:26
To: 'Julien Meuric'; 'Jonathan Hardwick'; pce@ietf.org
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org
Subject: Re: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Sighing slightly:-)

 

If, as may be the case= , there is a demand to make this work either as currently specified or to b= e seamlessly interoperable with what is already specified then so be it. Le= t's make that as a conscious decision.

 

However, I think that = using 7120 as an "excuse" is a bad idea. What 7120 is saying is t= hat the allocated code point must show some stability in meaning from the p= oint of early allocation on to RFC (just as it would need to if the RFC was revised). But that is not saying that, upon n= oticing that we are a herd of lemmings rushing towards the cliff we must sa= y "We have always rushed towards the cliff. Our parents rushed towards= the cliff. We must continue even if it means we plunge to our deaths."

 

Of course, nothing so = dramatic, but...

 

If the current specifi= cation works well - stay with it.

If the current specifi= cation works but is clumsy - tweak it in a backward compatible way

If the current specifi= cation is broken in a minor way - fix it in a backward compatible way<= /o:p>

If the current specifi= cation is more seriously broken - burn a new code point to fix it

 

In my earlier emails I= was only speculating on "how I would have done this if starting from = scratch." Obviously (?) I should have participated in WG discussions m= uch earlier in the cycle, and as a result my opinion really only counts if either:

- the current specific= ation is more seriously broken

or

- there is no WG desir= e to stick close to the current specification.

 

Clearly, although peop= le who implement against I-Ds are doing so at their own risk, we should not= unnecessarily burden early implementations with changes just for the sake = of change. There is a sliding scale of "better ways to do things" that incorporates "it's a bit= messy," "it will be easier to maintain and extend," all the= way up to "it's broken." The WG will want to work out where we a= re on that scale and weigh it against the cost and inconvenience of change. Shipping in software may be one measure. Deployed and in use is another me= asure.

 

Cheers,

Adrian

 

From:<= span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:"Tahoma"= ;,sans-serif;color:windowtext"> Julien Meuric [mailto:julien.meuric@orange.com]
Sent: 25 July 2017 09:31
To: Jonathan Hardwick; adrian@olddog.co.uk; pce@ietf.org
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org
Subject: Re: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Hi,

I agree that capability bitmap with optional capability-specific sub-TLVs w= ould be the way to go from scratch. However the SR-PCE-CAPABILITY already h= as an early allocated codepoint, and RFC 7120 says that "if there is a= change, implementations based on the earlier and later specifications must be seamlessly interoperable." As a result, it seems to me that adding this new format may require that th= e I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reason= s.

Cheers,

Julien

I agree that allowing = optional sub-TLVs is a good thing.  However, this strongly suggests th= at SR-PCE-CAPABILITY should become a sub-TLV, which is a non-backwards comp= atible change.  So, we are back to my original question.

 

Implementers – a= ny views?

 

Cheers

Jon<= /p>

 

 

From: Adrian Farrel [mailto:adrian@olddog.co.uk<= /span>]
Sent: 24 July 2017 19:51

 

Yes to that, Jon. But = what happens when the next thing comes along?

 

Since sub-TLVs can be = present, I would suggest to use a Setup-Type TLV with a bit map as I previo= usly described in my email, and add optional sub-TLVs dependent on the bits= that are set.

 

Isn't that the best of= both worlds?

 

Adrian

 

Fro= m: Jonathan Hardwick [mailto:Jonathan.Hardwick@met= aswitch.com]
Sent: 24 July 2017 09:15

 

Adrian,

 

The SR-PCE-CAPABILITY = TLV is more than just a Boolean value - it also contains information about = the maximum SID depth.  However, I like your idea and I think that it = gives us a better way to do this without breaking backwards compatibility with existing SR implementations.<= o:p>

 

Suppose we introduce a= setup-type TLV into the OPEN object as you propose, and assign a bit to ea= ch setup type.

If the TLV is absent, = then RSVP-TE is supported.

If the TLV is absent a= nd the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR are supported.=   This retains backwards compatibility with existing SR implementation= s.

If the TLV is present,= then the bits indicate which setup types are supported.<= /p>

 

We would modify the LS= P setup type draft to say that implementations supporting path setup types = other than RSVP-TE SHOULD include the setup-type TLV.

 

It’s not exactly= beautiful, but it’s not as ugly as RSVP-TE-NON-SUPPORT.<= /o:p>

 

Cheers

Jon<= /p>

 

 

From: Adrian Farrel [mailto:adrian@olddog.co.uk<= /span>]
Sent: 21 July 2017 19:55

 

Well, personally, if I= was designing this, I would not a whole TLV for each bit flag!=

I would have a Setup-T= ype TLV.

If that TLV is absent,= RSVP-TE is supported.

If the TLV is present,= each bit means that a different setup type is supported.=

 

That means...

Legacy nodes don't inc= lude the TLV and are assumed to support RSVP-TE

Legacy nodes that rece= ive the TLV don't know what it means and so object to the Open (leaving a n= ew node to re-Open for RSVP-TE only).

New nodes include the = TLV and so indicate explicitly what they support.

 

I know it is late for = that type of change, so how we proceed might depend on what implementations= have done already.

 

Adrian

 

Fro= m: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: 21 July 2017 16:07

 

Dear PCE-ers

 

I don’t want to distract from the SDN topic to= o much, but we have an important decision to make about draft-ietf-pce-lsp-= setup-type.

 

The shepherd review raised an issue that there is no= way for a PCEP speaker to indicate that it can’t (or won’t) su= pport RSVP-TE as a path setup type.  It is entirely plausible that a n= ode might not support RSVP-TE, or else have it disabled, for example in an SR-only network.

 

We think that draft-ietf-pce-lsp-setup-type should b= e changed to allow a speaker to declare that they do or don’t have su= pport for RSVP-TE paths.  There are two proposals.

 

1.&= nbsp;     Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-CAPABILITY TLV in their OPEN object.  If this TLV if mi= ssing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) the= n it means that the speaker does not support RSVP-TE as a path setup type.

2.&= nbsp;     Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON’T sup= port RSVP-TE.  If this TLV is omitted, it will be assumed that they do= support RSVP-TE.

 

The problem with (1) is that it is not backwards com= patible.  Any existing SR implementation which also supports RSVP will= not currently send this new capability.  So, if we make change (1) th= en forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE.=

 

The problem with (2) is that it is ugly, and in my o= pinion we should only do something ugly with a new protocol extension if we= simply can’t avoid doing it.

 

And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we ma= de change (1)?

 

Thanks

Jon

 

 

--_000_BY2PR0201MB1910141F84413E6EF976DF1684B80BY2PR0201MB1910_-- From nobody Tue Jul 25 08:16:01 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 08562131CF5; Tue, 25 Jul 2017 08:15:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XCCC3WqGH3WO; Tue, 25 Jul 2017 08:15:56 -0700 (PDT) Received: from mail-qt0-x235.google.com (mail-qt0-x235.google.com [IPv6:2607:f8b0:400d:c0d::235]) (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 2D643131CE2; Tue, 25 Jul 2017 08:15:56 -0700 (PDT) Received: by mail-qt0-x235.google.com with SMTP id r14so55420327qte.4; Tue, 25 Jul 2017 08:15:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=ZNdLIdLow2S6/jsM2281ipIzNLoNxHh4z1CLOjDNVG4=; b=XPn9kEY7E1+wIMdvSFyDVqaGTn60DyL9TKr/MWtznUIHkGMpNC2asvFkgAhaalgQ93 SOUUIKMRWMiSZkh/4oc4oHg5AUY1y48N+/gEMdM4/P/zv1Q0H7QgOgsimdsziE09O6Dg nNehPt6etnstFgN2hOXfEO9BDNQ3QM7hXMdP9PU8SvRhoYJeI7B+6jILNo8Hmyo8348p FL0baLMipzfat4WpS0Nl5Vc2M1NbyXLvXoO7vZHHF2ORxaHAxndYL6tltwqaaQ6yRiWm x0TZQSuEl8h0HuKT+/WLTy8GnIj7hEscKgyeA/+GLpCZVYt+3x8HIBJ3la9iSbYy9HbW SoSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=ZNdLIdLow2S6/jsM2281ipIzNLoNxHh4z1CLOjDNVG4=; b=rB1V1U/318qA7xQ+lcP0cpjgaqQnTR8ZA2/jo63Dw7bZtaivUHKKP+hiymBTs9IqwY XoRka7HJ8zPHvN985Q/SnAKHP+D3esFVdD1EnsO88M4IvlMNgiJ1uLpXw+TCJexiXc/i fnre9zn7Ntf9CTDwTc+P+pk3qB6EUHe/5bf4vizpg7Da3ETjoxjuE75By1aexU68abKR ieRuj0uMw6ExWILfqJmmZAIEuqQZMYx3Vrj7oll/eAFY3Gwe0VK/aaNZQ6J8qBkPTC/p /ZlP+U+s8ew3v4go2J1+cr98dI8rmTFQsqZKLuwkFH++HaxiiZFydAPVZIUhA0XWxjlI YKQA== X-Gm-Message-State: AIVw111hK15eItwiVWv5mHZjNItgKmO7O0Z5Y0nIBqO2V3mxzkP8sDut NTYpqH21Zz2Vi/6KNc4xRWE6egaWRQ== X-Received: by 10.237.32.41 with SMTP id 38mr27340359qta.68.1500995755213; Tue, 25 Jul 2017 08:15:55 -0700 (PDT) MIME-Version: 1.0 Sender: dhruvdhody@gmail.com X-Google-Sender-Delegation: dhruvdhody@gmail.com Received: by 10.237.51.131 with HTTP; Tue, 25 Jul 2017 08:15:54 -0700 (PDT) In-Reply-To: References: From: Dhruv Dhody Date: Tue, 25 Jul 2017 20:45:54 +0530 X-Google-Sender-Auth: jr5IA4aClla8rL9JVNO6upTJLTw Message-ID: To: "Belotti, Sergio (Nokia - IT/Vimercate)" Cc: Jonathan Hardwick , "pce@ietf.org" , "pce-chairs@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c0c9aeacc89ff055525ce4e" Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 15:15:59 -0000 --94eb2c0c9aeacc89ff055525ce4e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Sergio, We also have a PCE WG document which describes the use of PCEP in ACTN - https://datatracker.ietf.org/doc/draft-ietf-pce-applicability-actn/. Yes, ACTN solution via Yang models is perfectly valid. But that should not be a reason, to stop work on PCEP IMHO. Regards, Dhruv On Tue, Jul 25, 2017 at 8:22 PM, Belotti, Sergio (Nokia - IT/Vimercate) < sergio.belotti@nokia.com> wrote: > Hi Jon, all > > > > Looking at the mail below, it seems as though you derive needs to extend > PCEP , from the fact PCEP can be consider as having a root role in ACTN > context. > > Well, while ACTN does not mandate any protocol specific in his > architecture, the basic toolset to operate ACTN architecture is based on > NETCON/YANG model, as well described in the draft > https://datatracker.ietf.org/doc/draft-zhang-teas-actn-yang/ . Topology > model is used at MPI level to get topology information augmented with > needed technology specific information and Tunnel model (and related > technology specific augmentation) is used to create tunnel inside the > network , for CMI,VN Yang model is used to specifically operate on VN. N= o > mandatory need for PCEP extension to cover ACTN functionality, so I have = a > clear concern to go ahead with this request of PCEP extension as describe= d > in this mail. > > > > Thanks > > Sergio > > > > *From:* Pce [mailto:pce-bounces@ietf.org] *On Behalf Of *Jonathan Hardwic= k > *Sent:* Thursday, July 20, 2017 5:22 PM > *To:* pce@ietf.org > *Cc:* pce-chairs@ietf.org > *Subject:* [Pce] PCEP as an SDN controller protocol? > > > > Dear PCE WG > > > > The purpose of this email is to initiate a discussion about whether we > want to extend PCEP to allow it to replace the functions that are > traditionally provided by the routing and signalling protocols. > > > > Originally, PCEP was designed with the goal of providing a distributed > path computation service. In recent years we have extended that mission, > and added path modification and path instantiation capabilities to PCEP. > This has added capabilities to PCEP that would traditionally have been > performed by the network management plane. > > > > We are now starting to discuss proposals to add more capabilities to PCEP > =E2=80=93 capabilities that are traditionally part of routing and signall= ing. > There were three examples of this in the PCE working group meeting this > week. > > - The PCECC proposal, which extends PCEP=E2=80=99s path instantiation > capability so that the PCE can provision a path end-to-end by touching= each > hop along the path. This replaces the function already provided by RS= VP-TE. > - The PCEP-LS proposal, which extends PCEP to allow link state and TE > information to be communicated from the network to the PCE. This repl= aces > the link state flooding function provided by the IGPs, or BGP-LS. > - The PCECC-SR proposal extends PCEP to allow device-level > configuration to be communicated between the network and the PCE, such= as > SRGBs, prefix SIDs etc. Again, this replaces functions that are alrea= dy > designed into the IGPs. > > > > These proposals are taking PCEP in the direction of being a fully-fledged > SDN protocol. With these proposals, one can envision a network in which > there is no traditional control plane. PCEP is used to communicate the > current network state and to program flows. These proposals have their > roots in the ACTN and PCECC architectures that are adopted within the TEA= S > working group. TEAS is very much assuming that this is the direction tha= t > we want to take PCEP in. However, there are two procedural issues, as I > see it. > > 1. We have not had an explicit discussion in the PCE WG about whether > we want to take PCEP in this direction. We have had a few lively deba= tes > on specific cases, like PCEP-LS, but those cases represent the =E2=80= =9Cthin end of > the wedge=E2=80=9D. If we start down this path then we are accepting = that PCEP > will replace the functions available in the traditional control plane.= We > need to test whether there is a consensus in the working group to move= in > that direction. > 2. We do not currently have a charter that allows us to add this type > of capability to PCEP. Depending on the outcome of discussion (1), we= can > of course extend the charter. > > > > This email is to initiate the discussion (1). So, please reply to the > mailing list and share your thoughts on whether PCEP should be extended i= n > this direction, and how far we should go. > > > > I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2= =80=9D answers to this question > (although that would be better than no answer). I would like to hear > justifications for or against. Such as, which production networks would > run PCEP in place of a traditional control plane? Why is it not desirabl= e > to solve the problems in those networks with the traditional control > plane? What harm could this do? What would be the operational problems > associated with adding these functions to PCEP? > > > > Many thanks > > Jon > > > --94eb2c0c9aeacc89ff055525ce4e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Sergio,=C2=A0

We al= so have a PCE WG document which describes the use of PCEP in ACTN -=C2=A0https://datatracker.ietf.org/doc/draft-ietf-pce-applicability-actn/.= Yes, ACTN solution via Yang models is perfectly valid. But that should not= be a reason, to stop work on PCEP IMHO.=C2=A0

Regards,
Dhruv
=C2=A0=C2= =A0

On= Tue, Jul 25, 2017 at 8:22 PM, Belotti, Sergio (Nokia - IT/Vimercate) <sergio.belotti@nokia.com> wrote:

Hi Jon, all

=C2=A0

Looking at the mail below, it seems as though you de= rive needs to extend PCEP , from the fact PCEP can be consider as having a = root role in ACTN context.

Well, while ACTN does not mandate any protocol speci= fic in his architecture, the basic toolset=C2=A0 to operate ACTN architectu= re is based on NETCON/YANG model, as well described in the draft https://datatracker.ietf.org/doc/draft-zhang-teas-actn= -yang/ . Topology model is used at MPI level to get topology infor= mation augmented with needed technology specific information =C2=A0and Tunnel model =C2=A0(and related technology specific augmentation) is used = to create tunnel inside the network , =C2=A0for CMI,VN Yang model is used t= o specifically operate on VN. No mandatory need for PCEP extension to cover= ACTN functionality, so I have a clear concern to go ahead with this request of PCEP extension as described in this mail.=

=C2=A0

Thanks

Sergio

=C2=A0

From: Pce [mailto:pce-bounces@ietf.org] <= b>On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 5:22 PM
To: pce@ietf.org
Cc: pce-cha= irs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?

=C2=A0

Dear PCE WG

=C2=A0

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

=C2=A0

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.=C2=A0 In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.=C2=A0 This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

=C2=A0

We are now starting to discuss = proposals to add more capabilities to PCEP =E2=80=93 capabilities that are = traditionally part of routing and signalling.=C2=A0 There were three exampl= es of this in the PCE working group meeting this week.

  • The PCECC proposal, which extends PCEP=E2=80=99s p= ath instantiation capability so that the PCE can provision a path end-to-en= d by touching each hop along the path.=C2=A0 This replaces the function already provided by RSVP-TE.
  • The PCEP-LS proposal, which extends PCEP to allo= w link state and TE information to be communicated from the network to the = PCE.=C2=A0 This replaces the link state flooding function provided by the IGPs, or BGP-LS.
  • The PCECC-SR proposal extends PCEP to allow device-level = configuration to be communicated between the network and the PCE, such as S= RGBs, prefix SIDs etc.=C2=A0 Again, this replaces functions that are already designed into the IGPs.=

=C2=A0

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.=C2=A0 With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.=C2=A0 PCEP is used to communicate the current network state and to program flows.=C2=A0 These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.=C2=A0 TEAS is very much assuming that this is the directi= on that we want to take PCEP in.=C2=A0 However, there are two procedural issues, as I see it.

  1. We have not had an explicit discussion in the PCE = WG about whether we want to take PCEP in this direction.=C2=A0 We have had = a few lively debates on specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cthin end of the wedge=E2= =80=9D.=C2=A0 If we start down this path then we are accepting that PCEP wi= ll replace the functions available in the traditional control plane.=C2=A0 = We need to test whether there is a consensus in the working group to move in that direction.
  2. We do not currently have a charter that allows us= to add this type of capability to PCEP.=C2=A0 Depending on the outcome of = discussion (1), we can of course extend the charter.

=C2=A0

This email is to initiate the d= iscussion (1).=C2=A0 So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

=C2=A0

I am hoping to get more than ju= st =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this question (= although that would be better than no answer).=C2=A0 I would like to hear j= ustifications for or against.=C2=A0 Such as, which production networks woul= d run PCEP in place of a traditional control plane?=C2=A0 Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?=C2=A0 What harm could this do?=C2=A0 What would be the operational probl= ems associated with adding these functions to PCEP?

=C2=A0

Many thanks

Jon

=C2=A0


--94eb2c0c9aeacc89ff055525ce4e-- From nobody Tue Jul 25 08:23:45 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 74F2B131CF5; Tue, 25 Jul 2017 08:23:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RP_MATCHES_RCVD=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=hq.sk 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 MYGzzQZXH3Ym; Tue, 25 Jul 2017 08:23:41 -0700 (PDT) Received: from mail.hq.sk (hq.sk [81.89.59.181]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C0667131CE2; Tue, 25 Jul 2017 08:23:40 -0700 (PDT) Received: from nitebug.localdomain (chello085216197060.chello.sk [85.216.197.60]) by mail.hq.sk (Postfix) with ESMTPSA id 896CA243CA1; Tue, 25 Jul 2017 17:23:38 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hq.sk; s=mail; t=1500996218; bh=NTBaIRvGLHSbZgTEGUUOXlvEpY6aN1aj3QIYIqIJLKA=; h=Subject:To:Cc:References:From:Date:In-Reply-To; b=WDrrGAAWa8SguVOjP/fgw13ldBTCJdbcDnpS7xpe/8YlRSR9Vp8axi4H8vl85cr36 Ct6tVf7gIlugVxr5n+Id8oL0IVmt3tFvbCItBK3sokgtSD4fQVhmYrY8D64Hm6bcJW M7m8huBexRYf4l/Lbr79qPN9rkTVovdRWFH+hanU= To: Zhenghaomian , Daniele Ceccarelli , "stephane.litkowski@orange.com" , Jonathan Hardwick , "pce@ietf.org" Cc: "pce-chairs@ietf.org" References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> From: Robert Varga Message-ID: <993abd3a-ef81-90c5-2ac0-c9ac238f0aa7@hq.sk> Date: Tue, 25 Jul 2017 17:23:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="gfO5qvj0b9uF94TbkwC0jhVuXc7jlEhwk" Archived-At: Subject: Re: [Pce] =?utf-8?b?562U5aSNOiBQQ0VQIGFzIGFuIFNETiBjb250cm9sbGVyIHBy?= =?utf-8?q?otocol=3F?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 15:23:43 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --gfO5qvj0b9uF94TbkwC0jhVuXc7jlEhwk Content-Type: multipart/mixed; boundary="mBfSqcGE1lwuorNeec7M2gvSeGqk8SgBR"; protected-headers="v1" From: Robert Varga To: Zhenghaomian , Daniele Ceccarelli , "stephane.litkowski@orange.com" , Jonathan Hardwick , "pce@ietf.org" Cc: "pce-chairs@ietf.org" Message-ID: <993abd3a-ef81-90c5-2ac0-c9ac238f0aa7@hq.sk> Subject: =?UTF-8?Q?Re:_[Pce]_=e7=ad=94=e5=a4=8d:_PCEP_as_an_SDN_controller_p?= =?UTF-8?Q?rotocol=3f?= References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: --mBfSqcGE1lwuorNeec7M2gvSeGqk8SgBR Content-Type: text/plain; charset=gbk Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 25/07/17 03:58, Zhenghaomian wrote: > The point I would like to raise is how to deal with PCEP with other > protocols. Currently it seems that there is some competition with BGP i= n > link state (both binary but Optical/MW CANNOT run BGP), and also with > Netconf/RESTconf on device configuration (well they are text). I would like to dispel the notion that NETCONF/RESTCONF are inherently text-based. While they operate on XML Information Set and their currently-standardized transports are based on JSON/XML, there is no reason why you cannot use session-negotiated binary schema-informed encoding, which can in fact be more compact than PCEP. For NETCONF all you need to do is change the encoding at the Messages layer (https://tools.ietf.org/html/rfc6241#section-1.2). You can negotiate that at session setup time, for example using the approach proposed in https://tools.ietf.org/html/draft-varga-netconf-exi-capabilit= y. Regards, Robert --mBfSqcGE1lwuorNeec7M2gvSeGqk8SgBR-- --gfO5qvj0b9uF94TbkwC0jhVuXc7jlEhwk Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQI/BAEBCgApFiEEj8CFcGydMnp9J9aFKwPBKqDPANMFAll3YnoLHG5pdGVAaHEu c2sACgkQKwPBKqDPANO7JxAAkm0VgWVh5rS/JLh6RFKM8QdsRetb79+LqogsuKpN /jQfrxsQYZp3cOaKtR+O1FDuDR8bf5GvvIVcV7tXeP1rtK+4fBG9cSt5XU1+WXQw FiE5e3aCqbG1YNBPkvLdZx6tHGChu72DqYaolUXp04Yi6MTSBiAeU9SVSWSAYM9j Ds8JfScNg9K68Bv4/L5sEz8TW0C2z9amLqTrowU8KDzMgPAoh85WkvirExaRzRh+ ANwtjKMSe54CMsfuMcq2Q3ml5+Z3fDVoRsZyTpO0cg5m6Snn2ME7jpfLr4pyNHmL Fb96I41kIFAfBZ6ASLvaOi9xQHM+BJfaT/ybj8PNyUMT7X4SP7e4yDwc4Mnb8S6C Rjw8rwFAkl4muL0SHmOh1OPGlfIKBOW95QAbGm9uXKkZSYe5xkjeJGn1e3QcC77S luHR7UYR2N8wwpEm7LNdh4iafQF+lLbf/mylgyIe97qWjdTFL7TqafWQgASa5Kef QFskIwuF9vFX448+eBJK/IGeC/QHNJi+Lp6nszknjOlXOK3ZsGTBA8EknaIlR31Z 5+We2giDbbGhHCVQqEtw/1q89KxArBG7grTx8pBw0WEunlTHoepilBeREwFRq9pd bmZJskZ8QkCnlWIOHLdBzIyPJ0hCalbYA68SdnKoKIWsCEatytS4AzQtstCiiY1G IZQ= =MHIw -----END PGP SIGNATURE----- --gfO5qvj0b9uF94TbkwC0jhVuXc7jlEhwk-- From nobody Tue Jul 25 08:28:13 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 72C53131CFD; Tue, 25 Jul 2017 08:28:11 -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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9c15867UqTJM; Tue, 25 Jul 2017 08:28:08 -0700 (PDT) Received: from EUR01-HE1-obe.outbound.protection.outlook.com (mail-he1eur01on0702.outbound.protection.outlook.com [IPv6:2a01:111:f400:fe1e::702]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A0585131CFB; Tue, 25 Jul 2017 08:28:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nokia.onmicrosoft.com; s=selector1-nokia-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=o9az9LNFJqcDWiG+V2RQZtCQLrW+4UOqRL/Gcnf9gyA=; b=Cl5lC1mFEeehcdpnFHYU/XNDnperxJFB79NXIcfmzw6D7Feai4PGGoV/8isUF0uCBXx5YjXHdeRmp940PmUPqYvdr11mM3nZj9eSntyErCLWgYL75YCRk6ccuo7DgXZgLtsA3pUdNz77xS+D2J4yn8SV3qChCP5I5YlEl32DHfM= Received: from DB3PR07MB0588.eurprd07.prod.outlook.com (10.160.46.139) by DB3PR07MB0523.eurprd07.prod.outlook.com (10.160.44.156) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.1304.10; Tue, 25 Jul 2017 15:28:04 +0000 Received: from DB3PR07MB0588.eurprd07.prod.outlook.com ([fe80::d064:5bde:7c28:bcb8]) by DB3PR07MB0588.eurprd07.prod.outlook.com ([fe80::d064:5bde:7c28:bcb8%18]) with mapi id 15.01.1304.014; Tue, 25 Jul 2017 15:28:04 +0000 From: "Belotti, Sergio (Nokia - IT/Vimercate)" To: Dhruv Dhody CC: Jonathan Hardwick , "pce@ietf.org" , "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? 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Tue, 25 Jul 2017 17:37:47 +0000 From: "Scharf, Michael (Nokia - DE/Stuttgart)" To: Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Thread-Topic: PCEP as an SDN controller protocol? 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X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 17:37:53 -0000 --_000_AM5PR0701MB2547F5A74DB60F36FC63C81393B80AM5PR0701MB2547_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable PCEP-LS looks to me like an experiment. For IP, the value proposition of PCEP-LS compared to e.g. BGP-LS is unclear= to me. For optical nodes, I think an NMS or controller can deal with this without = requiring PCEP-LS, e.g., using NETCONF. For communication between controllers, typical use cases I am aware of requ= ire functions beyond the PCEP extensions listed below, so it is not obvious= whether PCEP extensions would be sufficient. Do we really want to throw spaghettis to the wall? Michael From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 5:22 PM To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? Dear PCE WG The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally= provided by the routing and signalling protocols. Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and a= dded path modification and path instantiation capabilities to PCEP. This h= as added capabilities to PCEP that would traditionally have been performed = by the network management plane. We are now starting to discuss proposals to add more capabilities to PCEP -= capabilities that are traditionally part of routing and signalling. There= were three examples of this in the PCE working group meeting this week. * The PCECC proposal, which extends PCEP's path instantiation capabilit= y so that the PCE can provision a path end-to-end by touching each hop alon= g the path. This replaces the function already provided by RSVP-TE. * The PCEP-LS proposal, which extends PCEP to allow link state and TE i= nformation to be communicated from the network to the PCE. This replaces t= he link state flooding function provided by the IGPs, or BGP-LS. * The PCECC-SR proposal extends PCEP to allow device-level configuratio= n to be communicated between the network and the PCE, such as SRGBs, prefix= SIDs etc. Again, this replaces functions that are already designed into t= he IGPs. These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which the= re is no traditional control plane. PCEP is used to communicate the curren= t network state and to program flows. These proposals have their roots in = the ACTN and PCECC architectures that are adopted within the TEAS working g= roup. TEAS is very much assuming that this is the direction that we want t= o take PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether we= want to take PCEP in this direction. We have had a few lively debates on = specific cases, like PCEP-LS, but those cases represent the "thin end of th= e wedge". If we start down this path then we are accepting that PCEP will = replace the functions available in the traditional control plane. We need = to test whether there is a consensus in the working group to move in that d= irection. 2. We do not currently have a charter that allows us to add this type of= capability to PCEP. Depending on the outcome of discussion (1), we can of= course extend the charter. This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this= direction, and how far we should go. I am hoping to get more than just "yes" or "no" answers to this question (a= lthough that would be better than no answer). I would like to hear justifi= cations for or against. Such as, which production networks would run PCEP = in place of a traditional control plane? Why is it not desirable to solve = the problems in those networks with the traditional control plane? What ha= rm could this do? What would be the operational problems associated with a= dding these functions to PCEP? Many thanks Jon --_000_AM5PR0701MB2547F5A74DB60F36FC63C81393B80AM5PR0701MB2547_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

PCEP-LS looks to me like an experiment.

 

For IP, the value proposition of PCEP-LS compared to= e.g. BGP-LS is unclear to me.

 

For optical nodes, I think an NMS or controller can = deal with this without requiring PCEP-LS, e.g., using NETCONF.

 

For communication between controllers, typical use c= ases I am aware of require functions beyond the PCEP extensions listed belo= w, so it is not obvious whether PCEP extensions would be sufficient.

 

Do we really want to throw spaghettis to the wall? <= o:p>

 

Michael

 

 

From: Pce [mailto:pce-bounces@ietf.org] On= Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 5:22 PM
To: pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?

 

Dear PCE WG

 

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

 

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.  In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.  This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

 

We are now starting to discuss = proposals to add more capabilities to PCEP – capabilities that are tr= aditionally part of routing and signalling.  There were three examples= of this in the PCE working group meeting this week.

  • <= span lang=3D"EN-GB">The PCECC proposal, which extends PCEP’s path ins= tantiation capability so that the PCE can provision a path end-to-end by to= uching each hop along the path.  This replaces the function already provided by RSVP-TE.
  • The PCEP-LS proposal, which extends PCEP to allow link state and= TE information to be communicated from the network to the PCE.  This = replaces the link state flooding function provided by the IGPs, or BGP-LS.
  • The PCECC-SR proposal extends PCEP to allow device-level configuration to = be communicated between the network and the PCE, such as SRGBs, prefix SIDs= etc.  Again, this replaces functions that are already designed into the IGPs.

 

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.  With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.  PCEP is used to communicate the current network state and to program flows.  These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.  TEAS is very much assuming that this is the directi= on that we want to take PCEP in.  However, there are two procedural issues, as I see it.

  1. <= span lang=3D"EN-GB">We have not had an explicit discussion in the PCE WG ab= out whether we want to take PCEP in this direction.  We have had a few= lively debates on specific cases, like PCEP-LS, but those cases represent the “thin end of the wedge”.  I= f we start down this path then we are accepting that PCEP will replace the = functions available in the traditional control plane.  We need to test= whether there is a consensus in the working group to move in that direction.
  2. We do no= t currently have a charter that allows us to add this type of capability to= PCEP.  Depending on the outcome of discussion (1), we can of course e= xtend the charter.

 

This email is to initiate the d= iscussion (1).  So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

 

I am hoping to get more than ju= st “yes” or “no” answers to this question (although= that would be better than no answer).  I would like to hear justifica= tions for or against.  Such as, which production networks would run PCEP in place of a traditional control plane?  Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational probl= ems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

--_000_AM5PR0701MB2547F5A74DB60F36FC63C81393B80AM5PR0701MB2547_-- From nobody Tue Jul 25 12:25:31 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5150112EBF4; Tue, 25 Jul 2017 12:25:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 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, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HeqVwpziDATA; Tue, 25 Jul 2017 12:25:27 -0700 (PDT) Received: from mail-qk0-x22c.google.com (mail-qk0-x22c.google.com [IPv6:2607:f8b0:400d:c09::22c]) (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 E0297124234; Tue, 25 Jul 2017 12:25:26 -0700 (PDT) Received: by mail-qk0-x22c.google.com with SMTP id d136so78611378qkg.3; Tue, 25 Jul 2017 12:25:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=gNuaR02DaNjzD2lfzwVaRvcLzdDDUdNvzDkUAqQb3eI=; b=RTUQmEPKnSSb/N5rdKO3mDGfoeo470NpgOJOK1rWwV9ZYYdg83R31dzix0hB8mwqwK o65+uDtjHQ1+dj16pY8PtjHe7vViYk70HNjEkomom/gdrK+uzlbrXeQqU/S4p+urjfpO OZ5gPacvO7dMm0L32h+Iyq5DBaxOai3H71NFVggo2obPRYLUU+gSSDdh/IcUxaA1682I e9I4PpigFTcyq6COuioVZCH88gu1zQ14Mpri3MS0BqqRTWY2dN4iGKk+AllI+/O4o9zy /h3/PkxQCQWbOMebH5VVYgJHL44NBKJ4f6VFSCz8EPVd9FieBM7vts9VAxlL6eVTt2n4 c3Gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=gNuaR02DaNjzD2lfzwVaRvcLzdDDUdNvzDkUAqQb3eI=; b=bMX33hzEvCKlBPKpfSUrQJ/PvrirYtBVJGZ8u5WICDttbvH/bmYcT9E9xYQ593G3rT QcGo7M+DfgppckpQm3oNT+sMY6sseMCfwe00GYnKjpu+iHv6AsCdnuUHUBXVatrIgabn eB/AaaS4m26gRw4JMl7kuvRgdXmRY7k9P5+c3+Wrwlez4mCnuiyCPbZSI3emL+8wgz40 RxJ1V8l1MWU3mUG5Esa6mmsDOSDjZWK47AG0msuSK8DnlAYeGM3rlevw6WyXMQ5KR3FN RrW+MZm2xryUA0HjaSvb5aIx9It8QN79n0FGE3Oo440WojTrujyRV3X+Zu2sn9M8gDC+ EFzQ== X-Gm-Message-State: AIVw111q/YvNFI6408IOtIhzH5SRmltT/gnBuyyuLKV5vpcFRaum/8Et 6NM028wyTWhEe9O52VS61PAnGgs6Gg== X-Received: by 10.55.174.133 with SMTP id x127mr28628125qke.286.1501010725857; Tue, 25 Jul 2017 12:25:25 -0700 (PDT) MIME-Version: 1.0 Received: by 10.12.174.193 with HTTP; Tue, 25 Jul 2017 12:25:25 -0700 (PDT) In-Reply-To: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> From: Cyril Margaria Date: Tue, 25 Jul 2017 15:25:25 -0400 Message-ID: To: "LITKOWSKI Stephane DTF/DERX" Cc: Jonathan Hardwick , "pce@ietf.org" , "pce-chairs@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c0647b21e701e0555294b2a" Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 19:25:30 -0000 --94eb2c0647b21e701e0555294b2a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable +1, PCEP is rather efficient at dealing with paths and constraints. PCE-CC , as someone mentioned earlier, can be seen as 1-hop LSPs, there could be minimum protocol extensions. PCEP-LS is redoing links-state flooding over PCEP, using the same elements as existing protocols. This sounds OK as an experiment but the operational or scale advantages to it seems very limited. I don't think we should overload PCEP to carry IGP information (nor device configuration) My 2 cents Cyril On 24 July 2017 at 08:02, wrote: > Hi, > > > > As soon as we started with the active stateful PCE, the PCE became an SDN > controller who takes decision and programs the network. > > So as many already mentioned, PCEP as an SBI is already done. > > > IMO, PCECC does not change significantly PCEP, it=E2=80=99s just bring a = new kind > of LSP style for this hop by hop path programming. A controller > implementing hop by hop path programming will require more intelligence a= s > it needs to program nodes in the right order to prevent transient loops= =E2=80=A6 > > > > The question is more what is the exact scope of PCEP in term of SBI and d= o > we want to create a protocol that does everything , including coffee J ? > > We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has > strength and weaknesses and I=E2=80=99m not sure that we need to mimic al= l features > in all protocols. What is the gain here ? > > The best approach may be to use strength of protocols and use them for > what they are good for: > > Example: > > IGP has good flooding capability with =E2=80=9Climited scale=E2=80=9D: in= teresting when > all receivers need the same information > > BGP has good flooding capability with large scale and ability to target > specific groups (using route targets/communities) : interesting when grou= ps > of receivers need the same information > > Netconf more generic and point to point > > =E2=80=A6 > > > > > > IMO: > > do we need PCEP-LS ? =3D> This can be discussed, we already have two > protocols to exchange the topology=E2=80=A6 > > do we need to add configuration capabilities in PCEP =3D> not sure, we ha= ve > Netconf for that. > > Why not limiting PCEP to path programming and path policies (traffic > steering on path=E2=80=A6) ? > > > > Brgds, > > > > *From:* Pce [mailto:pce-bounces@ietf.org] *On Behalf Of *Jonathan Hardwic= k > *Sent:* Thursday, July 20, 2017 17:22 > *To:* pce@ietf.org > *Cc:* pce-chairs@ietf.org > *Subject:* [Pce] PCEP as an SDN controller protocol? > > > > Dear PCE WG > > > > The purpose of this email is to initiate a discussion about whether we > want to extend PCEP to allow it to replace the functions that are > traditionally provided by the routing and signalling protocols. > > > > Originally, PCEP was designed with the goal of providing a distributed > path computation service. In recent years we have extended that mission, > and added path modification and path instantiation capabilities to PCEP. > This has added capabilities to PCEP that would traditionally have been > performed by the network management plane. > > > > We are now starting to discuss proposals to add more capabilities to PCEP > =E2=80=93 capabilities that are traditionally part of routing and signall= ing. > There were three examples of this in the PCE working group meeting this > week. > > =C2=B7 The PCECC proposal, which extends PCEP=E2=80=99s path insta= ntiation > capability so that the PCE can provision a path end-to-end by touching ea= ch > hop along the path. This replaces the function already provided by RSVP-= TE. > > =C2=B7 The PCEP-LS proposal, which extends PCEP to allow link stat= e and > TE information to be communicated from the network to the PCE. This > replaces the link state flooding function provided by the IGPs, or BGP-LS= . > > =C2=B7 The PCECC-SR proposal extends PCEP to allow device-level > configuration to be communicated between the network and the PCE, such as > SRGBs, prefix SIDs etc. Again, this replaces functions that are already > designed into the IGPs. > > > > These proposals are taking PCEP in the direction of being a fully-fledged > SDN protocol. With these proposals, one can envision a network in which > there is no traditional control plane. PCEP is used to communicate the > current network state and to program flows. These proposals have their > roots in the ACTN and PCECC architectures that are adopted within the TEA= S > working group. TEAS is very much assuming that this is the direction tha= t > we want to take PCEP in. However, there are two procedural issues, as I > see it. > > 1. We have not had an explicit discussion in the PCE WG about > whether we want to take PCEP in this direction. We have had a few lively > debates on specific cases, like PCEP-LS, but those cases represent the > =E2=80=9Cthin end of the wedge=E2=80=9D. If we start down this path then= we are accepting > that PCEP will replace the functions available in the traditional control > plane. We need to test whether there is a consensus in the working group > to move in that direction. > > 2. We do not currently have a charter that allows us to add this > type of capability to PCEP. Depending on the outcome of discussion (1), = we > can of course extend the charter. > > > > This email is to initiate the discussion (1). So, please reply to the > mailing list and share your thoughts on whether PCEP should be extended i= n > this direction, and how far we should go. > > > > I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2= =80=9D answers to this question > (although that would be better than no answer). I would like to hear > justifications for or against. Such as, which production networks would > run PCEP in place of a traditional control plane? Why is it not desirabl= e > to solve the problems in those networks with the traditional control > plane? What harm could this do? What would be the operational problems > associated with adding these functions to PCEP? > > > > Many thanks > > Jon > > > > _________________________________________________________________________= ________________________________________________ > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu 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 o= u falsifie. Merci. > > This message and its attachments may contain confidential or privileged i= nformation 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 de= lete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > Thank you. > > > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce > > --94eb2c0647b21e701e0555294b2a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
+1,=C2=A0

PCEP is rather efficient at d= ealing with paths and constraints.=C2=A0
PCE-CC , as someone ment= ioned earlier, can be seen as 1-hop LSPs, there could be minimum protocol e= xtensions. =C2=A0

PCEP-LS is redoing links-state f= looding over PCEP, using the same elements as existing protocols. This soun= ds OK as an experiment but the operational or scale advantages to it seems = very limited.=C2=A0

I don't think we should ov= erload PCEP to carry IGP information (nor device configuration)=C2=A0
=

My 2 cents
Cyril


On 24 July 2017 at = 08:02, <stephane.litkowski@orange.com> wrote:

Hi,

=C2=A0

As soon as we started = with the active stateful PCE, the PCE became an SDN controller who takes de= cision and programs the network.

So as many already men= tioned, PCEP as an SBI is already done.


IMO, PCECC does not change significantly PCEP, it=E2=80=99s just bring a ne= w kind of LSP style for this hop by hop path programming. A controller impl= ementing hop by hop path programming will require more intelligence as it n= eeds to program nodes in the right order to prevent transient loops=E2=80=A6

=C2=A0

The question is more w= hat is the exact scope of PCEP in term of SBI and do we want to create a pr= otocol that does everything , including coffee J ?

We already have plenty= of protocols: BGP, IGP, Netconf. Each protocol has strength and weaknesses= and I=E2=80=99m not sure that we need to mimic all features in all protoco= ls. What is the gain here ?

The best approach may = be to use strength of protocols and use them for what they are good for:=

Example:=

IGP has good flooding = capability with =E2=80=9Climited scale=E2=80=9D: interesting when all recei= vers need the same information

BGP has good flooding = capability with large scale and ability to target specific groups (using ro= ute targets/communities) : interesting when groups of receivers need the sa= me information

Netconf more generic a= nd point to point

=E2=80=A6

=C2=A0

=C2=A0

IMO:

do we need PCEP-LS ? = =3D> This can be discussed, we already have two protocols to exchange th= e topology=E2=80=A6

do we need to add conf= iguration capabilities in PCEP =3D> not sure, we have Netconf for that.<= u>

Why not limiting PCEP = to path programming and path policies (traffic steering on path=E2=80=A6) ?=

=C2=A0

Brgds,

=C2=A0

From: Pce [mai= lto:pce-bounces@i= etf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-cha= irs@ietf.org
Subject: [Pce] PCEP as an SDN controller protocol?

=C2=A0

Dear PCE WG

=C2=A0

The purpose of this email is to= initiate a discussion about whether we want to extend PCEP to allow it to = replace the functions that are traditionally provided by the routing and si= gnalling protocols.

=C2=A0

Originally, PCEP was designed w= ith the goal of providing a distributed path computation service.=C2=A0 In = recent years we have extended that mission, and added path modification and= path instantiation capabilities to PCEP.=C2=A0 This has added capabilities to PCEP that would traditionally have been per= formed by the network management plane.

=C2=A0

We are now starting to discuss = proposals to add more capabilities to PCEP =E2=80=93 capabilities that are = traditionally part of routing and signalling.=C2=A0 There were three exampl= es of this in the PCE working group meeting this week.

=C2=B7=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The PCECC proposal, which extends PCEP=E2=80=99= s path instantiation capability so that the PCE can provision a path end-to= -end by touching each hop along the path.=C2=A0 This replaces the function = already provided by RSVP-TE.

=C2=B7=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The PCEP-LS proposal, which extends PCEP to all= ow link state and TE information to be communicated from the network to the= PCE.=C2=A0 This replaces the link state flooding function provided by the = IGPs, or BGP-LS.

=C2=B7=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The PCECC-SR proposal extends PCEP to allow dev= ice-level configuration to be communicated between the network and the PCE,= such as SRGBs, prefix SIDs etc.=C2=A0 Again, this replaces functions that = are already designed into the IGPs.

=C2=A0

These proposals are taking PCEP= in the direction of being a fully-fledged SDN protocol.=C2=A0 With these p= roposals, one can envision a network in which there is no traditional contr= ol plane.=C2=A0 PCEP is used to communicate the current network state and to program flows.=C2=A0 These proposals have the= ir roots in the ACTN and PCECC architectures that are adopted within the TE= AS working group.=C2=A0 TEAS is very much assuming that this is the directi= on that we want to take PCEP in.=C2=A0 However, there are two procedural issues, as I see it.

1.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 We have not had an explicit discussion in the P= CE WG about whether we want to take PCEP in this direction.=C2=A0 We have h= ad a few lively debates on specific cases, like PCEP-LS, but those cases re= present the =E2=80=9Cthin end of the wedge=E2=80=9D.=C2=A0 If we start down this path then we are accepting that PCEP will replace the f= unctions available in the traditional control plane.=C2=A0 We need to test = whether there is a consensus in the working group to move in that direction= .

2.= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 We do not currently have a charter that allows = us to add this type of capability to PCEP.=C2=A0 Depending on the outcome o= f discussion (1), we can of course extend the charter.=

=C2=A0

This email is to initiate the d= iscussion (1).=C2=A0 So, please reply to the mailing list and share your th= oughts on whether PCEP should be extended in this direction, and how far we= should go.

=C2=A0

I am hoping to get more than ju= st =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this question (= although that would be better than no answer).=C2=A0 I would like to hear j= ustifications for or against.=C2=A0 Such as, which production networks woul= d run PCEP in place of a traditional control plane?=C2=A0 Why is it not desirabl= e to solve the problems in those networks with the traditional control plan= e?=C2=A0 What harm could this do?=C2=A0 What would be the operational probl= ems associated with adding these functions to PCEP?

=C2=A0

Many thanks

Jon

=C2=A0

____________________________________________________________=
_____________________________________________________________

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 message=
s 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 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.

_______________________________________________
Pce mailing list
Pce@ietf.org
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[107.1.141.74]) by smtp.gmail.com with ESMTPSA id 85sm30500053pfr.90.2017.07.25.13.37.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Jul 2017 13:37:35 -0700 (PDT) User-Agent: Microsoft-MacOutlook/f.24.0.170702 Date: Tue, 25 Jul 2017 13:37:33 -0700 From: Jeff Tantsura To: "Scharf, Michael (Nokia - DE/Stuttgart)" , Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" Message-ID: <9C4FE7B3-155E-4BAE-B94C-3D84B3EFA42F@gmail.com> Thread-Topic: [Pce] PCEP as an SDN controller protocol? Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3583834654_837074151" Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 20:37:39 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3583834654_837074151 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable LS distribution has a completely different set of characteristics, compared= to TED distribution, calling all of that PCEP-LS is incorrect. Back to my mike comments =E2=80=93 while TED distribution could be done with PCEP= , LS would be rather problematic. =20 Those of us who built first BGP-LS implementations would remember all the i= ssues and instability. Care should be taken, when instability in one domain would affect another (= PCE) domain, especially inter-protocol interactions (think IGP->PCEP) =20 Cheers, Jeff =20 From: Pce on behalf of "Scharf, Michael (Nokia - DE/= Stuttgart)" Date: Tuesday, July 25, 2017 at 10:37 To: Jonathan Hardwick , "pce@ietf.org" Cc: "pce-chairs@ietf.org" Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 PCEP-LS looks to me like an experiment. =20 For IP, the value proposition of PCEP-LS compared to e.g. BGP-LS is unclear= to me. =20 For optical nodes, I think an NMS or controller can deal with this without = requiring PCEP-LS, e.g., using NETCONF. =20 For communication between controllers, typical use cases I am aware of requ= ire functions beyond the PCEP extensions listed below, so it is not obvious = whether PCEP extensions would be sufficient.=20 =20 Do we really want to throw spaghettis to the wall?=20 =20 Michael =20 =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 5:22 PM To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? =20 Dear PCE WG =20 The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally = provided by the routing and signalling protocols. =20 Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and ad= ded path modification and path instantiation capabilities to PCEP. This has= added capabilities to PCEP that would traditionally have been performed by = the network management plane. =20 We are now starting to discuss proposals to add more capabilities to PCEP =E2= =80=93 capabilities that are traditionally part of routing and signalling. Ther= e were three examples of this in the PCE working group meeting this week. =C2=B7 The PCECC proposal, which extends PCEP=E2=80=99s path instantiation ca= pability so that the PCE can provision a path end-to-end by touching each ho= p along the path. This replaces the function already provided by RSVP-TE. =C2=B7 The PCEP-LS proposal, which extends PCEP to allow link state and= TE information to be communicated from the network to the PCE. This replac= es the link state flooding function provided by the IGPs, or BGP-LS. =C2=B7 The PCECC-SR proposal extends PCEP to allow device-level configu= ration to be communicated between the network and the PCE, such as SRGBs, pr= efix SIDs etc. Again, this replaces functions that are already designed int= o the IGPs. =20 These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which ther= e is no traditional control plane. PCEP is used to communicate the current = network state and to program flows. These proposals have their roots in the= ACTN and PCECC architectures that are adopted within the TEAS working group= . TEAS is very much assuming that this is the direction that we want to tak= e PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether= we want to take PCEP in this direction. We have had a few lively debates o= n specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cthin end of= the wedge=E2=80=9D. If we start down this path then we are accepting that PCEP w= ill replace the functions available in the traditional control plane. We ne= ed to test whether there is a consensus in the working group to move in that= direction. 2. We do not currently have a charter that allows us to add this type= of capability to PCEP. Depending on the outcome of discussion (1), we can = of course extend the charter. =20 This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this = direction, and how far we should go. =20 I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this que= stion (although that would be better than no answer). I would like to hear = justifications for or against. Such as, which production networks would run= PCEP in place of a traditional control plane? Why is it not desirable to s= olve the problems in those networks with the traditional control plane? Wha= t harm could this do? What would be the operational problems associated wit= h adding these functions to PCEP? =20 Many thanks Jon =20 _______________________________________________ Pce mailing list Pce@ietf.o= rg https://www.ietf.org/mailman/listinfo/pce=20 --B_3583834654_837074151 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

LS distribution has a completely different set of characteristics, compar= ed to TED distribution, calling all of that PCEP-LS is incorrect.=

Back to my mike= comments =E2=80=93 while TED distribution could be done with PCEP, LS would be ra= ther problematic.

 

Those of us who built first BGP-LS implementations would reme= mber all the issues and instability.

Care should be taken, when instability in on= e domain would affect another (PCE) domain, especially inter-protocol intera= ctions (think IGP->PCEP)

 

<= span style=3D'font-size:10.5pt;color:black'>Cheers,

Jeff

 

Fro= m: Pce <pce-bounces= @ietf.org> on behalf of "Scharf, Michael (Nokia - DE/Stuttgart)"= ; <michael.scharf@nokia.com>
Date: Tuesday, July 25, 2017 at= 10:37
To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com&= gt;, "pce@ietf.org" <pce@ietf.org>
Cc: "pce-c= hairs@ietf.org" <pce-chairs@ietf.org>
Subject: Re: [Pce= ] PCEP as an SDN controller protocol?

 

PCEP-LS looks to me like an experiment.

 

=

For IP, the value proposition of= PCEP-LS compared to e.g. BGP-LS is unclear to me.

 

For optical nodes, I think an NMS or controller can de= al with this without requiring PCEP-LS, e.g., using NETCONF.

<= p class=3DMsoNormal style=3D'margin-left:.5in'> 

For communication between controllers, typic= al use cases I am aware of require functions beyond the PCEP extensions list= ed below, so it is not obvious whether PCEP extensions would be sufficient. =

 =

Do we really want to throw s= paghettis to the wall?

 

Micha= el

 

 

<= div>

From: Pce [mail= to:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, 2017 5:22 PM
To: pce@ietf.org
Cc: = pce-chairs@ietf.org
Subject: [Pce] PCEP as an SDN controller proto= col?

&= nbsp;

Dear PCE WG

 

The purpose of this email is to initiate= a discussion about whether we want to extend PCEP to allow it to replace th= e functions that are traditionally provided by the routing and signalling pr= otocols.

 

Originally, PCEP was designed with the goal of p= roviding a distributed path computation service.  In recent years we ha= ve extended that mission, and added path modification and path instantiation= capabilities to PCEP.  This has added capabilities to PCEP that would = traditionally have been performed by the network management plane.

&nb= sp;

We are now starting to discuss proposals to add more capabilities = to PCEP =E2=80=93 capabilities that are traditionally part of routing and signalli= ng.  There were three examples of this in the PCE working group meeting= this week.

=C2=B7         The PCECC pr= oposal, which extends PCEP=E2=80=99s path instantiation capability so that the PCE= can provision a path end-to-end by touching each hop along the path.  = This replaces the function already provided by RSVP-TE.

=C2=B7 &nbs= p;       The PCEP-LS proposal, which extends PCEP to = allow link state and TE information to be communicated from the network to t= he PCE.  This replaces the link state flooding function provided by the= IGPs, or BGP-LS.

=C2=B7        = The PC= ECC-SR proposal extends PCEP to allow device-level configuration to be commu= nicated between the network and the PCE, such as SRGBs, prefix SIDs etc.&nbs= p; Again, this replaces functions that are already designed into the IGPs.

 

These proposals are taking PCEP in the direction of being = a fully-fledged SDN protocol.  With these proposals, one can envision a= network in which there is no traditional control plane.  PCEP is used = to communicate the current network state and to program flows.  These p= roposals have their roots in the ACTN and PCECC architectures that are adopt= ed within the TEAS working group.  TEAS is very much assuming that this= is the direction that we want to take PCEP in.  However, there are two= procedural issues, as I see it.

1.       We have not had an explicit discussion in t= he PCE WG about whether we want to take PCEP in this direction.  We hav= e had a few lively debates on specific cases, like PCEP-LS, but those cases = represent the =E2=80=9Cthin end of the wedge=E2=80=9D.  If we start down this path = then we are accepting that PCEP will replace the functions available in the = traditional control plane.  We need to test whether there is a consensu= s in the working group to move in that direction.

2.       We do not currently have a= charter that allows us to add this type of capability to PCEP.  Depend= ing on the outcome of discussion (1), we can of course extend the charter.

 

This email is to initiate the discussion (1).  So, pl= ease reply to the mailing list and share your thoughts on whether PCEP shoul= d be extended in this direction, and how far we should go.=

 

I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this qu= estion (although that would be better than no answer).  I would like to= hear justifications for or against.  Such as, which production network= s would run PCEP in place of a traditional control plane?  Why is it no= t desirable to solve the problems in those networks with the traditional con= trol plane?  What harm could this do?  What would be the operation= al problems associated with adding these functions to PCEP?

 

Many thanks

Jon

 

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

--B_3583834654_837074151-- From nobody Tue Jul 25 13:38:26 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7EE91131EE1; Tue, 25 Jul 2017 13:38:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 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, MIME_QP_LONG_LINE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vSIvww6W83jB; Tue, 25 Jul 2017 13:38:19 -0700 (PDT) Received: from mail-pg0-x241.google.com (mail-pg0-x241.google.com [IPv6:2607:f8b0:400e:c05::241]) (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 0C45F12420B; Tue, 25 Jul 2017 13:38:19 -0700 (PDT) Received: by mail-pg0-x241.google.com with SMTP id 125so1889660pgi.5; Tue, 25 Jul 2017 13:38:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=user-agent:date:subject:from:to:cc:message-id:thread-topic :references:in-reply-to:mime-version; bh=J5STqFCdr0m7f0mHjMH2F3+Tyjvu2GRKU/cKhcafPe8=; b=dnxXhCMhO+RTUhyweDHhyHpL3hG17fl41TNTr2FI6ibxq0P1gvcBrOUo3eKjnNWhDL HwZqb4h4OihYYsZ04oBkIFGhJ+k7H7pViTd6PNYH+i0HokfT1oMq0PR+jQMXml2mdFBt QbsKgOuh2P/cJ2ZMou2QRnE07k7E1okIOz9Yo91zIssddhoEkcmSaxBaD87VCizByuHK a3WeOTtyf69+ArXf9iAYIjfSIt2BIfqqX2ddFtX8yWmAxcC53z/+MA1PGPgVcNI0T80b zPj4El86P+sBxLPX41nHAaFEYvdUrkdUMtT17BZNCflVu3kuanqSer3cqJQc7FiXAKIA xB8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:user-agent:date:subject:from:to:cc:message-id :thread-topic:references:in-reply-to:mime-version; bh=J5STqFCdr0m7f0mHjMH2F3+Tyjvu2GRKU/cKhcafPe8=; b=LQMaLxwL39pcULPanwD6iFXcpQq2pjhc2TcIL1aSmjYBlDbEAapjB0RG2oCMT35QVG Frwo8epQewgN0hnSu8EdDeV/LZTfQaiWQc+rVNmD7ULRTgQeO0M7gX5s8n67AiB+AOqf r5qLe1JXmOxf+wlaC0iJzIa+BcA42CkgOYXGCbQ011Lk9ZEZ/fqvJYW/MVI0S170aGLi x+v2vkOqEdwUEdUQKKWmGSKtfUMPTIwwNQDIphUE2v0wIoWHdRx7BA2kAA3tXRwQs2Qg asOYPoVTZnQlYOSfZ+DZr4SLFe0+AWLGIJGMfgIwWVVqzrzZOhYg58ZTOhbPmoGHcwGb XOsg== X-Gm-Message-State: AIVw111Yyr5CwAwldF+Ean0Ex1K6BXxiaWo/RPHqpHNAUl7cTzDkKnIF D5iCkBn0A8i1IQ== X-Received: by 10.99.66.130 with SMTP id p124mr14346669pga.53.1501015098614; Tue, 25 Jul 2017 13:38:18 -0700 (PDT) Received: from [192.168.255.114] (107-1-141-74-ip-static.hfc.comcastbusiness.net. [107.1.141.74]) by smtp.gmail.com with ESMTPSA id 85sm30500053pfr.90.2017.07.25.13.38.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Jul 2017 13:38:17 -0700 (PDT) User-Agent: Microsoft-MacOutlook/f.24.0.170702 Date: Tue, 25 Jul 2017 13:38:17 -0700 From: Jeff Tantsura To: Cyril Margaria , LITKOWSKI Stephane DTF/DERX CC: "pce@ietf.org" , "pce-chairs@ietf.org" Message-ID: Thread-Topic: [Pce] PCEP as an SDN controller protocol? References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3583834697_1075071626" Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jul 2017 20:38:22 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3583834697_1075071626 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable ++1 =20 Cheers, Jeff =20 From: Pce on behalf of Cyril Margaria Date: Tuesday, July 25, 2017 at 12:25 To: LITKOWSKI Stephane DTF/DERX Cc: "pce@ietf.org" , "pce-chairs@ietf.org" Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 +1,=20 =20 PCEP is rather efficient at dealing with paths and constraints.=20 PCE-CC , as someone mentioned earlier, can be seen as 1-hop LSPs, there cou= ld be minimum protocol extensions. =20 =20 PCEP-LS is redoing links-state flooding over PCEP, using the same elements = as existing protocols. This sounds OK as an experiment but the operational o= r scale advantages to it seems very limited.=20 =20 I don't think we should overload PCEP to carry IGP information (nor device = configuration)=20 =20 My 2 cents Cyril =20 =20 On 24 July 2017 at 08:02, wrote: Hi, =20 As soon as we started with the active stateful PCE, the PCE became an SDN c= ontroller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it=E2=80=99s just bring a new kind= of LSP style for this hop by hop path programming. A controller implementin= g hop by hop path programming will require more intelligence as it needs to = program nodes in the right order to prevent transient loops=E2=80=A6 =20 The question is more what is the exact scope of PCEP in term of SBI and do = we want to create a protocol that does everything , including coffee J ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol has s= trength and weaknesses and I=E2=80=99m not sure that we need to mimic all features= in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for what= they are good for: Example: IGP has good flooding capability with =E2=80=9Climited scale=E2=80=9D: interesting when= all receivers need the same information BGP has good flooding capability with large scale and ability to target spe= cific groups (using route targets/communities) : interesting when groups of = receivers need the same information Netconf more generic and point to point =E2=80=A6 =20 =20 IMO:=20 do we need PCEP-LS ? =3D> This can be discussed, we already have two protocol= s to exchange the topology=E2=80=A6=20 do we need to add configuration capabilities in PCEP =3D> not sure, we have N= etconf for that. Why not limiting PCEP to path programming and path policies (traffic steeri= ng on path=E2=80=A6) ? =20 Brgds, =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? =20 Dear PCE WG =20 The purpose of this email is to initiate a discussion about whether we want= to extend PCEP to allow it to replace the functions that are traditionally = provided by the routing and signalling protocols. =20 Originally, PCEP was designed with the goal of providing a distributed path= computation service. In recent years we have extended that mission, and ad= ded path modification and path instantiation capabilities to PCEP. This has= added capabilities to PCEP that would traditionally have been performed by = the network management plane. =20 We are now starting to discuss proposals to add more capabilities to PCEP =E2= =80=93 capabilities that are traditionally part of routing and signalling. Ther= e were three examples of this in the PCE working group meeting this week. =C2=B7 The PCECC proposal, which extends PCEP=E2=80=99s path instantiation cap= ability so that the PCE can provision a path end-to-end by touching each hop= along the path. This replaces the function already provided by RSVP-TE. =C2=B7 The PCEP-LS proposal, which extends PCEP to allow link state and = TE information to be communicated from the network to the PCE. This replace= s the link state flooding function provided by the IGPs, or BGP-LS. =C2=B7 The PCECC-SR proposal extends PCEP to allow device-level configur= ation to be communicated between the network and the PCE, such as SRGBs, pre= fix SIDs etc. Again, this replaces functions that are already designed into= the IGPs. =20 These proposals are taking PCEP in the direction of being a fully-fledged S= DN protocol. With these proposals, one can envision a network in which ther= e is no traditional control plane. PCEP is used to communicate the current = network state and to program flows. These proposals have their roots in the= ACTN and PCECC architectures that are adopted within the TEAS working group= . TEAS is very much assuming that this is the direction that we want to tak= e PCEP in. However, there are two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about whether = we want to take PCEP in this direction. We have had a few lively debates on= specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cthin end of = the wedge=E2=80=9D. If we start down this path then we are accepting that PCEP wi= ll replace the functions available in the traditional control plane. We nee= d to test whether there is a consensus in the working group to move in that = direction. 2. We do not currently have a charter that allows us to add this type = of capability to PCEP. Depending on the outcome of discussion (1), we can o= f course extend the charter. =20 This email is to initiate the discussion (1). So, please reply to the mail= ing list and share your thoughts on whether PCEP should be extended in this = direction, and how far we should go. =20 I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this que= stion (although that would be better than no answer). I would like to hear = justifications for or against. Such as, which production networks would run= PCEP in place of a traditional control plane? Why is it not desirable to s= olve the problems in those networks with the traditional control plane? Wha= t harm could this do? What would be the operational problems associated wit= h adding these functions to PCEP? =20 Many thanks Jon =20 ___________________________________________________________________________= ______________________________________________ =20 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. =20 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. _______________________________________________ Pce mailing list Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce =20 _______________________________________________ Pce mailing list Pce@ietf.o= rg https://www.ietf.org/mailman/listinfo/pce=20 --B_3583834697_1075071626 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

++1

&= nbsp;

Cheers,

Jeff=

 

From: Pce <pce-bounces@ietf.org> on behalf of Cy= ril Margaria <cyril.margaria@gmail.com>
Date: Tuesday, July = 25, 2017 at 12:25
To: LITKOWSKI Stephane DTF/DERX <stephane.lit= kowski@orange.com>
Cc: "pce@ietf.org" <pce@ietf.or= g>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>
Sub= ject: Re: [Pce] PCEP as an SDN controller protocol?

 

+1, =

 

PCEP is rather efficien= t at dealing with paths and constraints. 

PCE-CC , as someone mentioned earlie= r, can be seen as 1-hop LSPs, there could be minimum protocol extensions. &n= bsp;

 

PC= EP-LS is redoing links-state flooding over PCEP, using the same elements as = existing protocols. This sounds OK as an experiment but the operational or s= cale advantages to it seems very limited. 

 

I don't think we should overload PC= EP to carry IGP information (nor device configuration) 

<= /div>

 

<= /div>

My 2 cents<= /p>

Cyril

 

 

On 24 July 2017 at = 08:02, <st= ephane.litkowski@orange.com> wrote:

Hi,

 

As soon as we started with the active stateful PCE, the PCE became an = SDN controller who takes decision and programs the network.

So as many already menti= oned, PCEP as an SBI is already done.


IMO, PCECC does not change significantly P= CEP, it=E2=80=99s just bring a new kind of LSP style for this hop by hop path prog= ramming. A controller implementing hop by hop path programming will require = more intelligence as it needs to program nodes in the right order to prevent= transient loops=E2=80=A6

 

The question is more what is the exact scope of PCEP in term of S= BI and do we want to create a protocol that does everything , including coff= ee J ?

We already have plenty of protocols: BGP, IGP, Netconf. Each = protocol has strength and weaknesses and I=E2=80=99m not sure that we need to mimi= c all features in all protocols. What is the gain here ?

The best approach may be to= use strength of protocols and use them for what they are good for:

Example:<= o:p>

IGP has good fl= ooding capability with =E2=80=9Climited scale=E2=80=9D: interesting when all receivers n= eed the same information

BGP has good flooding capability with large scale and abili= ty to target specific groups (using route targets/communities) : interesting= when groups of receivers need the same information

Netconf more generic and point t= o point

= =E2=80=A6

&nbs= p;

 = ;

IMO: <= /span>

do we ne= ed PCEP-LS ? =3D> This can be discussed, we already have two protocols to e= xchange the topology=E2=80=A6

do we need to add configuration capabilities in PCEP =3D> = not sure, we have Netconf for that.

= Why not limiting PCEP to path programming and pa= th policies (traffic steering on path=E2=80=A6) ?

 

Brgds,

 

From: Pce [mailto:= pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent:<= /b> Thursday, July 20, 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org
Subject: [Pce] P= CEP as an SDN controller protocol?

 

Dear PCE= WG

 

The purpose of this email i= s to initiate a discussion about whether we want to extend PCEP to allow it = to replace the functions that are traditionally provided by the routing and = signalling protocols.

 

Originall= y, PCEP was designed with the goal of providing a distributed path computati= on service.  In recent years we have extended that mission, and added p= ath modification and path instantiation capabilities to PCEP.  This has= added capabilities to PCEP that would traditionally have been performed by = the network management plane.

 

W= e are now starting to discuss proposals to add more capabilities to PCEP =E2=80=93= capabilities that are traditionally part of routing and signalling.  T= here were three examples of this in the PCE working group meeting this week.=

=C2=B7&nbs= p;       The PCECC pro= posal, which extends PCEP=E2=80=99s path instantiation capability so that the PCE = can provision a path end-to-end by touching each hop along the path.  T= his replaces the function already provided by RSVP-TE.

=

=C2=B7    &n= bsp;   The PCEP-LS proposal, which extends= PCEP to allow link state and TE information to be communicated from the net= work to the PCE.  This replaces the link state flooding function provid= ed by the IGPs, or BGP-LS.

=C2=B7        The PCECC-SR proposal extends PCEP to allow device-level config= uration to be communicated between the network and the PCE, such as SRGBs, p= refix SIDs etc.  Again, this replaces functions that are already design= ed into the IGPs.

&= nbsp;

These proposa= ls are taking PCEP in the direction of being a fully-fledged SDN protocol.&n= bsp; With these proposals, one can envision a network in which there is no t= raditional control plane.  PCEP is used to communicate the current netw= ork state and to program flows.  These proposals have their roots in th= e ACTN and PCECC architectures that are adopted within the TEAS working grou= p.  TEAS is very much assuming that this is the direction that we want = to take PCEP in.  However, there are two procedural issues, as I see it= .

1.     = We have not had an explicit discussion in the PCE W= G about whether we want to take PCEP in this direction.  We have had a = few lively debates on specific cases, like PCEP-LS, but those cases represen= t the =E2=80=9Cthin end of the wedge=E2=80=9D.  If we start down this path then we = are accepting that PCEP will replace the functions available in the traditio= nal control plane.  We need to test whether there is a consensus in the= working group to move in that direction.

= 2.      We do not c= urrently have a charter that allows us to add this type of capability to PCE= P.  Depending on the outcome of discussion (1), we can of course extend= the charter.

 = ;

This email is to = initiate the discussion (1).  So, please reply to the mailing list and = share your thoughts on whether PCEP should be extended in this direction, an= d how far we should go.

 

I am ho= ping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this question (a= lthough that would be better than no answer).  I would like to hear jus= tifications for or against.  Such as, which production networks would r= un PCEP in place of a traditional control plane?  Why is it not desirab= le to solve the problems in those networks with the traditional control plan= e?  What harm could this do?  What would be the operational proble= ms associated with adding these functions to PCEP?

 

Many thanks

Jon

&n= bsp;

______________=
____________________________________________________________________________=
_______________________________
 
Ce message et ses pie=
ces jointes peuvent contenir des informations confidentielles ou privilegiee=
s et ne doivent donc
pas etre =
diffuses, exploites ou copies sans autorisation. Si vous avez recu ce messag=
e par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete a=
ltere, deforme ou falsifie. Merci.
 
This message and i=
ts attachments may contain confidential or privileged information that may b=
e protected by law;
they shoul=
d not be distributed, used or copied without authorisation.
= 
If you have received this email in error, plea=
se 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.


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

 

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Thread-Index: AQHTBTCf4MkQenUQ3kWJMhJgg+tw46Jk1OiAgACOxkA= Date: Wed, 26 Jul 2017 02:35:00 +0000 Message-ID: <7AEB3D6833318045B4AE71C2C87E8E172B3F0714@SJCEML702-CHM.china.huawei.com> References: <32553_1500897775_5975E1EF_32553_88_1_9E32478DFA9976438E7A22F69B08FF921EA052B2@OPEXCLILMA4.corporate.adroot.infra.ftgroup> <129901d30535$03d06170$0b712450$@olddog.co.uk> In-Reply-To: <129901d30535$03d06170$0b712450$@olddog.co.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.210.166.158] Content-Type: multipart/alternative; boundary="_000_7AEB3D6833318045B4AE71C2C87E8E172B3F0714SJCEML702CHMchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020201.5977FFDA.0009, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.153, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 83e9bd6698df0ce8a1893989895c7aaa Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? 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--_000_7AEB3D6833318045B4AE71C2C87E8E172B3F0714SJCEML702CHMchi_-- From nobody Tue Jul 25 21:58:02 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B8EC131EDD; Tue, 25 Jul 2017 21:58:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.643 X-Spam-Level: X-Spam-Status: No, score=-3.643 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, INVALID_MSGID=0.568, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id man4_bshgJBi; Tue, 25 Jul 2017 21:57:57 -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 45210124D68; Tue, 25 Jul 2017 21:57:56 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml709-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DSB06766; Wed, 26 Jul 2017 04:57:54 +0000 (GMT) Received: from DGGEMI401-HUB.china.huawei.com (10.3.17.134) by lhreml709-cah.china.huawei.com (10.201.108.32) with Microsoft SMTP Server (TLS) id 14.3.301.0; Wed, 26 Jul 2017 05:57:52 +0100 Received: from DGGEMI512-MBX.china.huawei.com ([169.254.4.51]) by dggemi401-hub.china.huawei.com ([10.3.17.134]) with mapi id 14.03.0301.000; Wed, 26 Jul 2017 12:57:44 +0800 From: Mahendra Singh Negi To: Jonathan Hardwick , adrian , "'Julien Meuric'" , pce , Dhruv Dhody CC: draft-ietf-pce-lsp-setup-type , draft-ietf-pce-segment-routing , Dhruv Dhody Thread-Topic: RE: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? Thread-Index: AQHTBcu3fAS6jWht7Ear8SRkHd2Dvw== Date: Wed, 26 Jul 2017 04:57:44 +0000 Message-ID: 58AFDC36-8072-4F25-AFD6-4B7AB562AE2C References: <0eca01d3024a$84045bf0$8c0d13d0$@olddog.co.uk> <114d01d304ad$bf3c26c0$3db47440$@olddog.co.uk> <127d01d30534$a47cb1b0$ed761510$@olddog.co.uk> , In-Reply-To: Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_58AFDC3680724F25AFD64B7AB562AE2C_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020204.59782152.00A4, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=169.254.4.51, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 1b5a454dedc0fb7840ad90af69dd13f0 Archived-At: Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-ietf-pce-lsp-setup-type? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Jul 2017 04:58:01 -0000 --_000_58AFDC3680724F25AFD64B7AB562AE2C_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Very much OK with that. Thanks a lot. Regards, Mahendra (Huawei Tech India Pvt. Ltd.) From:Jonathan Hardwick To:Mahendra Singh Negi,adrian,'Julien Meuric',pce,Dhruv Dhody, Cc:draft-ietf-pce-lsp-setup-type,draft-ietf-pce-segment-routing, Date:2017-07-25 20:36:04 Subject:RE: [Pce] Can we make a non-backwards compatible change to draft-ie= tf-pce-lsp-setup-type? Mahendra, many thanks for your input. PCE WG, we have a backwards compatible proposal on the table which, apart f= rom making a special case of SR-PCE-CAPABILITY, seems reasonably clean (or,= at least, not seriously broken). Shall we go forwards with that? Best regards Jon From: Mahendra Singh Negi [mailto:mahendrasingh@huawei.com] Sent: 25 July 2017 13:12 To: adrian@olddog.co.uk; 'Julien Meuric' ; Jonath= an Hardwick ; pce@ietf.org; Dhruv Dhody <= dhruv.dhody@huawei.com> Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@= ietf.org Subject: RE: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Dear All, This is to answer on implantation row, apologies for the delayed response, = YES we do have our PCEP solutions deployed in mixed SR/RSVP-TE environment= s. I am afraid any non-backward compatible changes will break our solution. So= hope we choose a backward compatible solution. Regards, Mahendra (Huawei Tech India Pvt Ltd) From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Adrian Farrel Sent: 25 July 2017 16:26 To: 'Julien Meuric'; 'Jonathan Hardwick'; pce@ietf.org Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Sighing slightly:-) If, as may be the case, there is a demand to make this work either as curre= ntly specified or to be seamlessly interoperable with what is already speci= fied then so be it. Let's make that as a conscious decision. However, I think that using 7120 as an "excuse" is a bad idea. What 7120 is= saying is that the allocated code point must show some stability in meanin= g from the point of early allocation on to RFC (just as it would need to if= the RFC was revised). But that is not saying that, upon noticing that we a= re a herd of lemmings rushing towards the cliff we must say "We have always= rushed towards the cliff. Our parents rushed towards the cliff. We must co= ntinue even if it means we plunge to our deaths." Of course, nothing so dramatic, but... If the current specification works well - stay with it. If the current specification works but is clumsy - tweak it in a backward c= ompatible way If the current specification is broken in a minor way - fix it in a backwar= d compatible way If the current specification is more seriously broken - burn a new code poi= nt to fix it In my earlier emails I was only speculating on "how I would have done this = if starting from scratch." Obviously (?) I should have participated in WG d= iscussions much earlier in the cycle, and as a result my opinion really onl= y counts if either: - the current specification is more seriously broken or - there is no WG desire to stick close to the current specification. Clearly, although people who implement against I-Ds are doing so at their o= wn risk, we should not unnecessarily burden early implementations with chan= ges just for the sake of change. There is a sliding scale of "better ways t= o do things" that incorporates "it's a bit messy," "it will be easier to ma= intain and extend," all the way up to "it's broken." The WG will want to wo= rk out where we are on that scale and weigh it against the cost and inconve= nience of change. Shipping in software may be one measure. Deployed and in = use is another measure. Cheers, Adrian From: Julien Meuric [mailto:julien.meuric@orange.com] Sent: 25 July 2017 09:31 To: Jonathan Hardwick; adrian@olddog.co.uk; pce= @ietf.org Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org Subject: Re: [Pce] Can we make a non-backwards compatible change to draft-i= etf-pce-lsp-setup-type? Hi, I agree that capability bitmap with optional capability-specific sub-TLVs w= ould be the way to go from scratch. However the SR-PCE-CAPABILITY already h= as an early allocated codepoint, and RFC 7120 says that "if there is a chan= ge, implementations based on the earlier and later specifications must be s= eamlessly interoperable." As a result, it seems to me that adding this new format may require that th= e I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reason= s. Cheers, Julien Jul. 25, 2017 - Jonathan.Hardwick@metaswitch.com: I agree that allowing optional sub-TLVs is a good thing. However, this str= ongly suggests that SR-PCE-CAPABILITY should become a sub-TLV, which is a n= on-backwards compatible change. So, we are back to my original question. Implementers =96 any views? Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 24 July 2017 19:51 Yes to that, Jon. But what happens when the next thing comes along? Since sub-TLVs can be present, I would suggest to use a Setup-Type TLV with= a bit map as I previously described in my email, and add optional sub-TLVs= dependent on the bits that are set. Isn't that the best of both worlds? Adrian From: Jonathan Hardwick [mailto:Jonathan.Hardwick@metaswitch.com] Sent: 24 July 2017 09:15 Adrian, The SR-PCE-CAPABILITY TLV is more than just a Boolean value - it also conta= ins information about the maximum SID depth. However, I like your idea and= I think that it gives us a better way to do this without breaking backward= s compatibility with existing SR implementations. Suppose we introduce a setup-type TLV into the OPEN object as you propose, = and assign a bit to each setup type. If the TLV is absent, then RSVP-TE is supported. If the TLV is absent and the SR-PCE-CAPABILITY TLV is present, then RSVP-TE= and SR are supported. This retains backwards compatibility with existing = SR implementations. If the TLV is present, then the bits indicate which setup types are support= ed. We would modify the LSP setup type draft to say that implementations suppor= ting path setup types other than RSVP-TE SHOULD include the setup-type TLV. It=92s not exactly beautiful, but it=92s not as ugly as RSVP-TE-NON-SUPPORT= . Cheers Jon From: Adrian Farrel [mailto:adrian@olddog.co.uk] Sent: 21 July 2017 19:55 Well, personally, if I was designing this, I would not a whole TLV for each= bit flag! I would have a Setup-Type TLV. If that TLV is absent, RSVP-TE is supported. If the TLV is present, each bit means that a different setup type is suppor= ted. That means... Legacy nodes don't include the TLV and are assumed to support RSVP-TE Legacy nodes that receive the TLV don't know what it means and so object to= the Open (leaving a new node to re-Open for RSVP-TE only). New nodes include the TLV and so indicate explicitly what they support. I know it is late for that type of change, so how we proceed might depend o= n what implementations have done already. Adrian From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: 21 July 2017 16:07 Dear PCE-ers I don=92t want to distract from the SDN topic too much, but we have an impo= rtant decision to make about draft-ietf-pce-lsp-setup-type. The shepherd review raised an issue that there is no way for a PCEP speaker= to indicate that it can=92t (or won=92t) support RSVP-TE as a path setup t= ype. It is entirely plausible that a node might not support RSVP-TE, or el= se have it disabled, for example in an SR-only network. We think that draft-ietf-pce-lsp-setup-type should be changed to allow a sp= eaker to declare that they do or don=92t have support for RSVP-TE paths. T= here are two proposals. 1. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-CAPABILITY TLV in their OPEN object. If this TLV if missin= g, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) then it= means that the speaker does not support RSVP-TE as a path setup type. 2. Change draft-ietf-pce-lsp-setup-type so that speakers MUST include = a (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON=92T suppor= t RSVP-TE. If this TLV is omitted, it will be assumed that they do support= RSVP-TE. The problem with (1) is that it is not backwards compatible. Any existing = SR implementation which also supports RSVP will not currently send this new= capability. So, if we make change (1) then forwards-level implementations= will incorrectly conclude that such backwards-level implementations do not= support RSVP-TE. The problem with (2) is that it is ugly, and in my opinion we should only d= o something ugly with a new protocol extension if we simply can=92t avoid d= oing it. And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP= -TE environment that would be broken if we made change (1)? Thanks Jon --_000_58AFDC3680724F25AFD64B7AB562AE2C_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Very much OK with that.
Thanks a lot.

Regards,
Mahendra (Huawei Tech India Pvt. Ltd.)
From:Jonathan Hardwick
To:Mahendra Singh Negi,adrian,'J= ulien Meuric',pce,Dhruv Dhody,
Cc:draft-ietf-pce-lsp-setup-type= ,draft-ietf-pce-segment-routing,
Date:2017-07-25 20:36:04
Subject:RE: [Pce] Can we make a = non-backwards compatible change to draft-ietf-pce-lsp-setup-type?

Mahendra, many thanks = for your input.

 

PCE WG, we have a back= wards compatible proposal on the table which, apart from making a special c= ase of SR-PCE-CAPABILITY, seems reasonably clean (or, at least, not serious= ly broken).  Shall we go forwards with that?

 

Best regards

Jon

 

 

F= rom: Mahendra Si= ngh Negi [mailto:mahendrasingh@huawei.com]
Sent: 25 July 2017 13:12
To: adrian@olddog.co.uk; 'Julien Meuric' <julien.meuric@orange.co= m>; Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; pce@ietf= .org; Dhruv Dhody <dhruv.dhody@huawei.com>
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-r= outing@ietf.org
Subject: RE: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Dear All,<= /p>

 

This is to answer= on implantation row, apologies for the delayed response,  YES we do h= ave our PCEP solutions deployed in mixed SR/RSVP-TE environments.

I am afraid any n= on-backward compatible changes will break our solution. So hope we choose a= backward compatible solution.

 

Regards,

Mahendra (Huawei = Tech India Pvt Ltd)

 <= /span>

From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Adrian Farrel
Sent: 25 July 2017 16:26
To: 'Julien Meuric'; 'Jonathan Hardwick'; pce@ietf.org
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org
Subject: Re: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Sighing slightly:-)

 

If, as may be the case= , there is a demand to make this work either as currently specified or to b= e seamlessly interoperable with what is already specified then so be it. Le= t's make that as a conscious decision.

 

However, I think that = using 7120 as an "excuse" is a bad idea. What 7120 is saying is t= hat the allocated code point must show some stability in meaning from the p= oint of early allocation on to RFC (just as it would need to if the RFC was revised). But that is not saying that, upon n= oticing that we are a herd of lemmings rushing towards the cliff we must sa= y "We have always rushed towards the cliff. Our parents rushed towards= the cliff. We must continue even if it means we plunge to our deaths."

 

Of course, nothing so = dramatic, but...

 

If the current specifi= cation works well - stay with it.

If the current specifi= cation works but is clumsy - tweak it in a backward compatible way

If the current specifi= cation is broken in a minor way - fix it in a backward compatible way

If the current specifi= cation is more seriously broken - burn a new code point to fix it

 

In my earlier emails I= was only speculating on "how I would have done this if starting from = scratch." Obviously (?) I should have participated in WG discussions m= uch earlier in the cycle, and as a result my opinion really only counts if either:

- the current specific= ation is more seriously broken

or

- there is no WG desir= e to stick close to the current specification.

 

Clearly, although peop= le who implement against I-Ds are doing so at their own risk, we should not= unnecessarily burden early implementations with changes just for the sake = of change. There is a sliding scale of "better ways to do things" that incorporates "it's a bit= messy," "it will be easier to maintain and extend," all the= way up to "it's broken." The WG will want to work out where we a= re on that scale and weigh it against the cost and inconvenience of change. Shipping in software may be one measure. Deployed and in use is another me= asure.

 

Cheers,

Adrian

 

From: Julien Meuric [mailto:julien.meuric@orange.com<= /span>]
Sent: 25 July 2017 09:31
To: Jonathan Hardwick; adrian@olddog.co.uk; pce@ietf.org<= /a>
Cc: draft-ietf-pce-lsp-setup-type@ietf.org; draft-ietf-pce-segment-routing@ietf.org
Subject: Re: [Pce] Can we make a non-backwards compatible change to = draft-ietf-pce-lsp-setup-type?

 

Hi,

I agree that capability bitmap with optional capability-specific sub-TLVs w= ould be the way to go from scratch. However the SR-PCE-CAPABILITY already h= as an early allocated codepoint, and RFC 7120 says that "if there is a= change, implementations based on the earlier and later specifications must be seamlessly interoperable." As a result, it seems to me that adding this new format may require that th= e I-D keeps documenting an optional SR-PCE-CAPABILITY TLV for legacy reason= s.

Cheers,

Julien

I agree that allowing = optional sub-TLVs is a good thing.  However, this strongly suggests th= at SR-PCE-CAPABILITY should become a sub-TLV, which is a non-backwards comp= atible change.  So, we are back to my original question.

 

Implementers =96 any v= iews?

 

Cheers

Jon

 

 

From: Adrian Farrel [mailto:adrian@olddog.co.uk<= /span>]
Sent: 24 July 2017 19:51

 

Yes to that, Jon. But = what happens when the next thing comes along?

 

Since sub-TLVs can be = present, I would suggest to use a Setup-Type TLV with a bit map as I previo= usly described in my email, and add optional sub-TLVs dependent on the bits= that are set.

 

Isn't that the best of= both worlds?

 

Adrian

 

Fr= om: Jonathan Hardwick [mailto:Jonathan.Hardwick@= metaswitch.com]
Sent: 24 July 2017 09:15

 

Adrian,

 

The SR-PCE-CAPABILITY = TLV is more than just a Boolean value - it also contains information about = the maximum SID depth.  However, I like your idea and I think that it = gives us a better way to do this without breaking backwards compatibility with existing SR implementations.<= /p>

 

Suppose we introduce a= setup-type TLV into the OPEN object as you propose, and assign a bit to ea= ch setup type.

If the TLV is absent, = then RSVP-TE is supported.

If the TLV is absent a= nd the SR-PCE-CAPABILITY TLV is present, then RSVP-TE and SR are supported.=   This retains backwards compatibility with existing SR implementation= s.

If the TLV is present,= then the bits indicate which setup types are supported.

 

We would modify the LS= P setup type draft to say that implementations supporting path setup types = other than RSVP-TE SHOULD include the setup-type TLV.

 

It=92s not exactly bea= utiful, but it=92s not as ugly as RSVP-TE-NON-SUPPORT.

 

Cheers

Jon

 

 

From: Adrian Farrel [mailto:adrian@olddog.co.uk<= /span>]
Sent: 21 July 2017 19:55

 

Well, personally, if I= was designing this, I would not a whole TLV for each bit flag!

I would have a Setup-T= ype TLV.

If that TLV is absent,= RSVP-TE is supported.

If the TLV is present,= each bit means that a different setup type is supported.

 

That means...

Legacy nodes don't inc= lude the TLV and are assumed to support RSVP-TE

Legacy nodes that rece= ive the TLV don't know what it means and so object to the Open (leaving a n= ew node to re-Open for RSVP-TE only).

New nodes include the = TLV and so indicate explicitly what they support.

 

I know it is late for = that type of change, so how we proceed might depend on what implementations= have done already.

 

Adrian

 

Fr= om: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick
Sent: 21 July 2017 16:07

 

Dear PCE-ers

 

I don=92t want to distract from the SDN topic too mu= ch, but we have an important decision to make about draft-ietf-pce-lsp-setu= p-type.

 

The shepherd review raised an issue that there is no= way for a PCEP speaker to indicate that it can=92t (or won=92t) support RS= VP-TE as a path setup type.  It is entirely plausible that a node migh= t not support RSVP-TE, or else have it disabled, for example in an SR-only network.

 

We think that draft-ietf-pce-lsp-setup-type should b= e changed to allow a speaker to declare that they do or don=92t have suppor= t for RSVP-TE paths.  There are two proposals.

 

1.=       Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-CAPABILITY TLV in their OPEN object.  If this TLV if mi= ssing, but some other CAPABILITY TLV is present (such as SR-CAPABILITY) the= n it means that the speaker does not support RSVP-TE as a path setup type.

2.=       Change draft-ietf-pce-lsp-setup-type so that speakers MUST include a= (new) RSVP-TE-NON-SUPPORT TLV in their OPEN object if they DON=92T support= RSVP-TE.  If this TLV is omitted, it will be assumed that they do sup= port RSVP-TE.

 

The problem with (1) is that it is not backwards com= patible.  Any existing SR implementation which also supports RSVP will= not currently send this new capability.  So, if we make change (1) th= en forwards-level implementations will incorrectly conclude that such backwards-level implementations do not support RSVP-TE.=

 

The problem with (2) is that it is ugly, and in my o= pinion we should only do something ugly with a new protocol extension if we= simply can=92t avoid doing it.

 

And so the question: are there any *deployments* of PCEP in a mixed SR/RSVP-TE environment that would be broken if we ma= de change (1)?

 

Thanks

Jon

 

 

--_000_58AFDC3680724F25AFD64B7AB562AE2C_-- From nobody Wed Jul 26 18:36:34 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 894CA131F39; Wed, 26 Jul 2017 18:36:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ppypPwNLqdnZ; Wed, 26 Jul 2017 18:36:27 -0700 (PDT) Received: from m176115.mail.qiye.163.com (m176115.mail.qiye.163.com [59.111.176.115]) by ietfa.amsl.com (Postfix) with ESMTP id 1041F131F2C; Wed, 26 Jul 2017 18:36:26 -0700 (PDT) Received: from WangajPC (unknown [219.142.69.78]) by m176115.mail.qiye.163.com (Hmail) with ESMTPA id 7253A661DCA; Thu, 27 Jul 2017 09:36:23 +0800 (CST) From: "Aijun Wang" To: "'Jeff Tantsura'" , "'Igor Bryskin'" , , "'Jonathan Hardwick'" , Cc: References: <62EE87B8-AF9A-4155-A2BD-11495D9A3996@gmail.com> In-Reply-To: <62EE87B8-AF9A-4155-A2BD-11495D9A3996@gmail.com> Date: Thu, 27 Jul 2017 09:36:20 +0800 Message-ID: <005f01d30678$c032e740$4098b5c0$@org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0060_01D306BB.CE562740" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AdMEyfnQTxxnojrBRrSNyn78artbXgBq5c/Q Content-Language: zh-cn X-HM-Spam-Status: e1kIGBQJHllBS1VLV1koWUFKTEtLSjdXWS1ZQUlXWQkOFx4IWUFZMjUtOj cyP0FLVUtZBg++ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Nzo6Cgw6LzoyOUovFk0WL0sK SwkKCRJVSlVKTktKSkpCSENIQk9CVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlJSkJVSk9JVU1CVUxDWVdZCAFZQU9ISkhNNwY+ X-HM-Tid: 0a5d81b008919373kuws7253a661dca Archived-At: Subject: [Pce] =?utf-8?b?562U5aSNOiAgUENFUCBhcyBhbiBTRE4gY29udHJvbGxlciBw?= =?utf-8?q?rotocol=3F?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Jul 2017 01:36:31 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_0060_01D306BB.CE562740 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I agree with Jeff.=20 The communication between distributed device2device is different from = device2controller. The latter should be complementary of the former, = not replace them. We operator just want to use such SBI protocol to enhance the = coordination among the underlying devices, especially for the end-to-end = optimal path programming.=20 If the PCEP protocol can be extended to transfer some key parameters, we = can easily deploy one unified solution to cover several different = scenario, regardless they are in MPLS, Native IPv4, or IPv6 network. = This can certainly relieve our burden to cope with the different = solutions for different scenarios. =20 We have also make the scenario/requirements presentation at Prague, If = you are interesting, please refer the material at CCDR Presentation = Material = . We have also compared the different approach protocols to fulfill them, = and think PCEP may be the most candidate protocol to accomplish them. =20 Best Regards. =20 Aijun Wang Network R&D and Operation Support Department China Telecom Corporation Limited Beijing Research Institute,Beijing, = China. =20 =E5=8F=91=E4=BB=B6=E4=BA=BA: Pce [mailto:pce-bounces@ietf.org] = =E4=BB=A3=E8=A1=A8 Jeff Tantsura =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2017=E5=B9=B47=E6=9C=8825=E6=97=A5 = 6:12 =E6=94=B6=E4=BB=B6=E4=BA=BA: Igor Bryskin; = stephane.litkowski@orange.com; Jonathan Hardwick; pce@ietf.org =E6=8A=84=E9=80=81: pce-chairs@ietf.org =E4=B8=BB=E9=A2=98: Re: [Pce] PCEP as an SDN controller protocol? =20 We all know =E2=80=93 every protocol has its strong and less strong = sides, however the properties required for a distributed device2device = communication are quite different from device2controller environment and = should be evaluated as such. There=E2=80=99s a long list of pros and cons for either environments = (objective functions) as well operational preferences, domain knowledge, = and such =20 Most of us here are biased =E2=98=BA=20 To put it short =E2=80=93 I believe there=E2=80=99s enough people who = are interested in working on PCEP to extend it, personally I see value = in having PCEP next to any other SBI=E2=80=99s mentioned below, however = what I don=E2=80=99t want, is to overload semantics of PCEP (aka BGP = kitchen sink =E2=98=BA). =20 Cheers, Jeff =20 From: Pce on behalf of Igor Bryskin = Date: Monday, July 24, 2017 at 14:52 To: "stephane.litkowski@orange.com" , = Jonathan Hardwick , "pce@ietf.org" = Cc: "pce-chairs@ietf.org" Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 Hi Stephanie, =20 You said: < Why not limiting PCEP to path programming and path policies (traffic = steering on path=E2=80=A6) ? =20 But why not to use for these purposes RESTCONF or gRPC/protobuffs? Do = you see value in using explicit model based SBIs vs implicit (TLV-) = based protocols such as PCE? =20 Cheers,, Igor =20 =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of = stephane.litkowski@orange.com Sent: Monday, July 24, 2017 8:03 AM To: Jonathan Hardwick; pce@ietf.org Cc: pce-chairs@ietf.org Subject: Re: [Pce] PCEP as an SDN controller protocol? =20 Hi, =20 As soon as we started with the active stateful PCE, the PCE became an = SDN controller who takes decision and programs the network. So as many already mentioned, PCEP as an SBI is already done. IMO, PCECC does not change significantly PCEP, it=E2=80=99s just bring a = new kind of LSP style for this hop by hop path programming. A controller = implementing hop by hop path programming will require more intelligence = as it needs to program nodes in the right order to prevent transient = loops=E2=80=A6 =20 The question is more what is the exact scope of PCEP in term of SBI and = do we want to create a protocol that does everything , including coffee = J ? We already have plenty of protocols: BGP, IGP, Netconf. Each protocol = has strength and weaknesses and I=E2=80=99m not sure that we need to = mimic all features in all protocols. What is the gain here ? The best approach may be to use strength of protocols and use them for = what they are good for: Example: IGP has good flooding capability with =E2=80=9Climited scale=E2=80=9D: = interesting when all receivers need the same information BGP has good flooding capability with large scale and ability to target = specific groups (using route targets/communities) : interesting when = groups of receivers need the same information Netconf more generic and point to point =E2=80=A6 =20 =20 IMO:=20 do we need PCEP-LS ? =3D> This can be discussed, we already have two = protocols to exchange the topology=E2=80=A6=20 do we need to add configuration capabilities in PCEP =3D> not sure, we = have Netconf for that. Why not limiting PCEP to path programming and path policies (traffic = steering on path=E2=80=A6) ? =20 Brgds, =20 From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Jonathan Hardwick Sent: Thursday, July 20, 2017 17:22 To: pce@ietf.org Cc: pce-chairs@ietf.org Subject: [Pce] PCEP as an SDN controller protocol? =20 Dear PCE WG =20 The purpose of this email is to initiate a discussion about whether we = want to extend PCEP to allow it to replace the functions that are = traditionally provided by the routing and signalling protocols. =20 Originally, PCEP was designed with the goal of providing a distributed = path computation service. In recent years we have extended that = mission, and added path modification and path instantiation capabilities = to PCEP. This has added capabilities to PCEP that would traditionally = have been performed by the network management plane. =20 We are now starting to discuss proposals to add more capabilities to = PCEP =E2=80=93 capabilities that are traditionally part of routing and = signalling. There were three examples of this in the PCE working group = meeting this week. =C2=B7 The PCECC proposal, which extends PCEP=E2=80=99s path = instantiation capability so that the PCE can provision a path end-to-end = by touching each hop along the path. This replaces the function already = provided by RSVP-TE. =C2=B7 The PCEP-LS proposal, which extends PCEP to allow link = state and TE information to be communicated from the network to the PCE. = This replaces the link state flooding function provided by the IGPs, or = BGP-LS. =C2=B7 The PCECC-SR proposal extends PCEP to allow device-level = configuration to be communicated between the network and the PCE, such = as SRGBs, prefix SIDs etc. Again, this replaces functions that are = already designed into the IGPs. =20 These proposals are taking PCEP in the direction of being a = fully-fledged SDN protocol. With these proposals, one can envision a = network in which there is no traditional control plane. PCEP is used to = communicate the current network state and to program flows. These = proposals have their roots in the ACTN and PCECC architectures that are = adopted within the TEAS working group. TEAS is very much assuming that = this is the direction that we want to take PCEP in. However, there are = two procedural issues, as I see it. 1. We have not had an explicit discussion in the PCE WG about = whether we want to take PCEP in this direction. We have had a few = lively debates on specific cases, like PCEP-LS, but those cases = represent the =E2=80=9Cthin end of the wedge=E2=80=9D. If we start down = this path then we are accepting that PCEP will replace the functions = available in the traditional control plane. We need to test whether = there is a consensus in the working group to move in that direction. 2. We do not currently have a charter that allows us to add this = type of capability to PCEP. Depending on the outcome of discussion (1), = we can of course extend the charter. =20 This email is to initiate the discussion (1). So, please reply to the = mailing list and share your thoughts on whether PCEP should be extended = in this direction, and how far we should go. =20 I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or = =E2=80=9Cno=E2=80=9D answers to this question (although that would be = better than no answer). I would like to hear justifications for or = against. Such as, which production networks would run PCEP in place of = a traditional control plane? Why is it not desirable to solve the = problems in those networks with the traditional control plane? What = harm could this do? What would be the operational problems associated = with adding these functions to PCEP? =20 Many thanks Jon =20 _________________________________________________________________________= ________________________________________________ =20 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. =20 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. _______________________________________________ Pce mailing list = Pce@ietf.org https://www.ietf.org/mailman/listinfo/pce=20 ------=_NextPart_000_0060_01D306BB.CE562740 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I agree with Jeff. =

The communication between = distributed device2device is different from device2controller.=C2=A0 The = latter should be complementary of the former, not replace = them.

We operator just want to use = such SBI protocol to enhance the coordination among the underlying = devices, especially for the end-to-end optimal path programming. =

If the PCEP protocol can be = extended to transfer some key parameters, we can easily deploy one = unified solution to cover several different scenario, regardless they = are in MPLS, Native IPv4, or IPv6 network. This can certainly relieve = our burden to cope with the different solutions for different = scenarios.=C2=A0

We have also make = the scenario/requirements presentation at Prague, =C2=A0If you are = interesting, please refer the material at CCDR Presentation Material.

We have also compared the = different approach protocols to fulfill them, and think PCEP may be the = most candidate protocol to accomplish them.

 

Best = Regards.

 

Aijun = Wang

Network R&D = and Operation Support Department

China Telecom = Corporation Limited Beijing Research Institute,Beijing, = China.

 

=E5=8F=91=E4=BB= =B6=E4=BA=BA: Pce = [mailto:pce-bounces@ietf.org] =E4=BB=A3=E8=A1= =A8 Jeff = Tantsura
=E5=8F=91=E9=80= =81=E6=97=B6=E9=97=B4: = 2017=E5=B9=B47=E6=9C=8825=E6=97=A5 6:12
=E6=94=B6=E4=BB=B6=E4=BA=BA: Igor Bryskin; = stephane.litkowski@orange.com; Jonathan Hardwick; = pce@ietf.org
=E6=8A=84=E9=80=81: = pce-chairs@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Pce] PCEP as an SDN = controller protocol?

 

We all = know =E2=80=93 every protocol has its strong and less strong sides, = however the properties required for a distributed device2device = communication are quite different from device2controller environment and = should be evaluated as such.

There=E2=80=99s a long list of pros and cons = for either environments (objective functions) as well operational = preferences, domain knowledge, and such

 

Most of = us here are biased =E2=98=BA =

To put it short =E2=80=93 I believe = there=E2=80=99s enough people who are interested in working on PCEP to = extend it, personally I see value in having PCEP next to any other = SBI=E2=80=99s mentioned below, however what I don=E2=80=99t want, is to = overload semantics of PCEP (aka BGP kitchen sink =E2=98=BA).

 

Cheers,

Jeff

 

From: = Pce = <pce-bounces@ietf.org> = on behalf of Igor Bryskin <Igor.Bryskin@huawei.com>Date: Monday, July 24, 2017 at 14:52
To: "stephane.litkowski@orange.c= om" <stephane.litkowski@orange.c= om>, Jonathan Hardwick <Jonathan.Hardwick@metasw= itch.com>, "pce@ietf.org" <pce@ietf.org>
Cc: "pce-chairs@ietf.org" <pce-chairs@ietf.org>
Sub= ject: Re: [Pce] PCEP as an SDN controller = protocol?

 

Hi Stephanie,

 

You said:

< Why not limiting PCEP to path programming = and path policies (traffic steering on path=E2=80=A6) ?

 

But why not to use for these purposes RESTCONF = or gRPC/protobuffs? Do you see value in using explicit model based SBIs = vs implicit (TLV-) based protocols such as  PCE?

 

Cheers,,

Igor

 

 

From:= Pce [mailto:pce-bounces@ietf.org] = On Behalf Of stephane.litkowski@orange.c= om
Sent: Monday, July 24, 2017 8:03 AM
To: = Jonathan Hardwick; pce@ietf.org
Cc: pce-chairs@ietf.org
Subject= : Re: [Pce] PCEP as an SDN controller protocol?

 

Hi,

 

As soon as we started with the active stateful = PCE, the PCE became an SDN controller who takes decision and programs = the network.

So as many already mentioned, PCEP as an SBI is = already done.


IMO, PCECC does not change significantly = PCEP, it=E2=80=99s just bring a new kind of LSP style for this hop by = hop path programming. A controller implementing hop by hop path = programming will require more intelligence as it needs to program nodes = in the right order to prevent transient loops=E2=80=A6

 

The question is more what is the exact scope of = PCEP in term of SBI and do we want to create a protocol that does = everything , including coffee J ?

We already have plenty of protocols: BGP, IGP, = Netconf. Each protocol has strength and weaknesses and I=E2=80=99m not = sure that we need to mimic all features in all protocols. What is the = gain here ?

The best approach may be to use strength of = protocols and use them for what they are good for:

Example:

IGP has good flooding capability with = =E2=80=9Climited scale=E2=80=9D: interesting when all receivers need the = same information

BGP has good flooding capability with large = scale and ability to target specific groups (using route = targets/communities) : interesting when groups of receivers need the = same information

Netconf more generic and point to = point

=E2=80=A6

 

 

IMO:

do we need PCEP-LS ? =3D> This can be = discussed, we already have two protocols to exchange the = topology=E2=80=A6

do we need to add configuration capabilities in = PCEP =3D> not sure, we have Netconf for that.

Why not limiting PCEP to path programming and = path policies (traffic steering on path=E2=80=A6) ?

 

Brgds,

 

From:= Pce [mailto:pce-bounces@ietf.org] = On Behalf Of Jonathan Hardwick
Sent: Thursday, July 20, = 2017 17:22
To: pce@ietf.org
Cc: pce-chairs@ietf.org
Subject= : [Pce] PCEP as an SDN controller protocol?

 

Dear PCE WG

 

The purpose of this = email is to initiate a discussion about whether we want to extend PCEP = to allow it to replace the functions that are traditionally provided by = the routing and signalling protocols.

 

Originally, PCEP was = designed with the goal of providing a distributed path computation = service.  In recent years we have extended that mission, and added = path modification and path instantiation capabilities to PCEP.  = This has added capabilities to PCEP that would traditionally have been = performed by the network management plane.

 

We are now starting to = discuss proposals to add more capabilities to PCEP =E2=80=93 = capabilities that are traditionally part of routing and = signalling.  There were three examples of this in the PCE working = group meeting this week.

=C2=B7        The PCECC proposal, which extends PCEP=E2=80=99s path = instantiation capability so that the PCE can provision a path end-to-end = by touching each hop along the path.  This replaces the function = already provided by RSVP-TE.

=C2=B7        The PCEP-LS proposal, which extends PCEP to allow link = state and TE information to be communicated from the network to the = PCE.  This replaces the link state flooding function provided by = the IGPs, or BGP-LS.

=C2=B7        The PCECC-SR proposal extends PCEP to allow device-level = configuration to be communicated between the network and the PCE, such = as SRGBs, prefix SIDs etc.  Again, this replaces functions that are = already designed into the IGPs.

 

These proposals are = taking PCEP in the direction of being a fully-fledged SDN = protocol.  With these proposals, one can envision a network in = which there is no traditional control plane.  PCEP is used to = communicate the current network state and to program flows.  These = proposals have their roots in the ACTN and PCECC architectures that are = adopted within the TEAS working group.  TEAS is very much assuming = that this is the direction that we want to take PCEP in.  However, = there are two procedural issues, as I see it.

1.      We have not had an explicit discussion in the PCE WG about = whether we want to take PCEP in this direction.  We have had a few = lively debates on specific cases, like PCEP-LS, but those cases = represent the =E2=80=9Cthin end of the wedge=E2=80=9D.  If we start = down this path then we are accepting that PCEP will replace the = functions available in the traditional control plane.  We need to = test whether there is a consensus in the working group to move in that = direction.

2.      We do not currently have a charter that allows us to add = this type of capability to PCEP.  Depending on the outcome of = discussion (1), we can of course extend the charter.

 

This email is to = initiate the discussion (1).  So, please reply to the mailing list = and share your thoughts on whether PCEP should be extended in this = direction, and how far we should go.

 

I am hoping to get more = than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this = question (although that would be better than no answer).  I would = like to hear justifications for or against.  Such as, which = production networks would run PCEP in place of a traditional control = plane?  Why is it not desirable to solve the problems in those = networks with the traditional control plane?  What harm could this = do?  What would be the operational problems associated with adding = these functions to PCEP?

 

Many thanks

Jon

 

____________________________________________________________=
_____________________________________________________________<=
/span>
 
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. =
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------=_NextPart_000_0060_01D306BB.CE562740-- From nobody Thu Jul 27 11:11:53 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0EFDC13209D; Thu, 27 Jul 2017 11:11:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.138 X-Spam-Level: X-Spam-Status: No, score=-5.138 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, HTML_OBFUSCATE_05_10=0.26, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-2.8, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iIA_X1TAT3fB; Thu, 27 Jul 2017 11:11:49 -0700 (PDT) Received: from relais-inet.orange.com (mta136.mail.business.static.orange.com [80.12.70.36]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D680D13209C; Thu, 27 Jul 2017 11:11:48 -0700 (PDT) Received: from opfednr00.francetelecom.fr (unknown [xx.xx.xx.64]) by opfednr23.francetelecom.fr (ESMTP service) with ESMTP id 3232AC0654; Thu, 27 Jul 2017 20:11:47 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.72]) by opfednr00.francetelecom.fr (ESMTP service) with ESMTP id DDDE21A0065; Thu, 27 Jul 2017 20:11:46 +0200 (CEST) Received: from [10.193.71.188] (10.168.234.3) by OPEXCLILMA3.corporate.adroot.infra.ftgroup (10.114.31.72) with Microsoft SMTP Server (TLS) id 14.3.352.0; Thu, 27 Jul 2017 20:11:46 +0200 To: Jonathan Hardwick , "pce@ietf.org" CC: "pce-chairs@ietf.org" References: From: Organization: Orange Labs Message-ID: <578_1501179107_597A2CE3_578_20_1_3370ad53-9c64-8048-e75b-d9e825f34a30@orange.com> Date: Thu, 27 Jul 2017 20:11:45 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------9886C9AE93476F710620E571" Content-Language: en-GB X-Originating-IP: [10.168.234.3] Archived-At: Subject: Re: [Pce] PCEP as an SDN controller protocol? X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Jul 2017 18:11:52 -0000 --------------9886C9AE93476F710620E571 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi Jon, Thanks to open this thread. As many of you have already said, PCEP is alrea= dy an SDN controller protocol since the work on stateful mode. But, IMHO, r= ecent drafts doesn't go into the right direction. Let me explain: 1/ On PCE-LS. Of course there is already plenty of solution to learn the to= pologye.g. listen to IGP protocol, BGP-LS ... But, dont forget that the pri= mary goal of PCE is to compute a path on a topology. This mean that the PCE= need a graph which represent the network topology. This graph is extract f= rom the TED, later fulfil by the topology learning mechanism. Why PCE-LS an= d other equivalent mechanism that collect topology information on a node by= node basis ? Simply because you are unable to guarantee that the graph you= extract from what you learn is accurate. Indeed, a node known its interfac= es through what the administrator configure in this node. But, it doesn't k= now exactly to which neighbour it is connected while there is a protocol be= tween node. In IP network, it is the role of the IGP. if there is an error = in the node configuration, the IGP adjacency doesn't fire up and thus, IGP = or BGP-LS will not report this link betwenn the two nodes. The graph is not= complete, but not wrong. So when you learn the topology from the IGP you could guarantee = that the link between two nodes corresponds effectively to what is really c= onfigured and physically connected. If there is no protocol between the nod= es, you can't guarantee that what the node announce through PCEP-LS is accu= rate. E.g. Node A report Link A-Band node B report Link B-A instead of Link= B-C and LinkB-C instead of Link B-A due to a wrong manual configuration. Y= ou obtain a wrong topology and thus a wrong graphas you invert two links be= tween two nodes. An you have no way to check it. So, in any case, and it is= true for Optical / Transport network, you MUST run an IGP in your network = to be sure that the topology is accurate and so to guarantee that the PCE w= ork on a correct graph. A PCE working on a bad topology is painful. So, bec= ause you must run an IGP in your network, fulfil the PCE TED by listen the = IGP or BGP-LS is the best solution. IMHO, PCEWG must not work on alternativ= e solution to learn topology. 2/ On PCE-CC: Why extending PCE for such functionality ? For IP/MPLS, it is= a non sense to study such solutionespecially with Segment Routing where yo= u need to configure the edge node. For Optical / Transport network, well, a= gain, it is not the good solution. First, vendor are opposed to open their = ROADM to fine tune the configuration of the node disregarding if the protoc= ol is PCEP or Netconf. So, if you intend to control an Optical / Transport = network through anSDN Controller, the best is to useGMPLS. This keep vendor= adjust the lambda without disclosing their IPR. Of course their is an init= iative named OpenROADM which try to break thiswith its TransortPCE project = within OpenDayLight. But look at the spec: it is yang model + NetConf. Not = PCEP + extension.Again, IMHO, it is not the good solution to study. 3/ On PCECC-SR. This time, it could make sense. But, again, it is not the g= ood way to proceed. In fact, when you use PCEP as control protocol, the nod= e doesn't store the configuration like it does with NetConf in the standard= -config, but it is store in the ephemeral config. This means that when the = PCEP session break or the node reload, all the configuration is loose. If y= ou need to wait PCE configuration to finish to boot e.g. advertise Segment = Routing capabilities need SRGB, prefix SID ... it isnot a safe solution. Fo= r that kind of information NetConf is superior to PCEP. In addition SPRING = WG is working on yang model for NetConf for this purpose. Not on PCEP exten= sion. One more time, IMHO, PCE WG must not spent energy in this direction. 4/ What is missing? Yes. There is missing pieces in the puzzle. And spent e= nergy to extra functions while essentialones are not ready is not the good = way to progress. I'm referring to thetraffic steering. I know that there is= a very recent draft that propose a FlowSpec like in PCEP. Indeed, once a t= unnel is setup through PCEP, you have no good tool to enforce the traffic i= n this newly created tunnel. Again, using NetConf is not a good idea as you= mix ephemeral config and standard config. BGP-FlowSpec is too close too re= lated to BGP and not ensure fine granularity you wish to steer the traffic = into a tunnel.So, IMHO, this is the direction where the WG must go. Now, just to finish, can you raise hand in the room to count the number of = operational network where RSVP-TE is really used (I mean other than those u= sed for FRR) ? number of operational network using Segment Routing ? And on= this few subset the number that really use PCEP ? I'm pretty sure that I h= ave sufficient finger in one hand to count them. And, if I restrict them to= which are really need Path Computation with constraints (I mean path diver= sity, bandwidth reservation, delay constraint ...) I will be very happy if = one hand raise in the room. So, fromthis poor operational usage, we absolut= ely don't know if PCEP is stable, scale at large... Can we guarantee that a= PCE could maintain a PCEP session with all nodes in a large network (say 1= 000 nodes and more) ? No. Because nobody report on the WG such experience l= ike other WG do. Do we have interoperability issues ? Yes plenty. From all = industrial and OpenSource PCE solutions I tested no one implement correctly= all the RFCs and recent drafts. So, before extending PCEP I suggest to concentrate on im= plementing what is already available. Make large experiment, see what's hap= pen. Debug, report, adjust. Then we could think about the future of PCEP wh= en we will collect sufficient backgroundand experience. Upto know, from wha= t I experiment, the technology is good, promising, but too young. my 2cts Olivier Le 20/07/2017 =C3=A0 17:22, Jonathan Hardwick a =C3=A9crit : > > Dear PCE WG > >=20=20 > > The purpose of this email is to initiate a discussion about whether we wa= nt to extend PCEP to allow it to replace the functions that are traditional= ly provided by the routing and signalling protocols. > >=20=20 > > Originally, PCEP was designed with the goal of providing a distributed pa= th computation service. In recent years we have extended that mission, and= added path modification and path instantiation capabilities to PCEP. This= has added capabilities to PCEP that would traditionally have been performe= d by the network management plane. > >=20=20 > > We are now starting to discuss proposals to add more capabilities to PCEP= =E2=80=93 capabilities that are traditionally part of routing and signalli= ng. There were three examples of this in the PCE working group meeting thi= s week. > > =C2=B7 The PCECC proposal, which extends PCEP=E2=80=99s path insta= ntiation capability so that the PCE can provision a path end-to-end by touc= hing each hop along the path. This replaces the function already provided = by RSVP-TE. > > =C2=B7 The PCEP-LS proposal, which extends PCEP to allow link stat= e and TE information to be communicated from the network to the PCE. This = replaces the link state flooding function provided by the IGPs, or BGP-LS. > > =C2=B7 The PCECC-SR proposal extends PCEP to allow device-level co= nfiguration to be communicated between the network and the PCE, such as SRG= Bs, prefix SIDs etc. Again, this replaces functions that are already desig= ned into the IGPs. > >=20=20 > > These proposals are taking PCEP in the direction of being a fully-fledged= SDN protocol. With these proposals, one can envision a network in which t= here is no traditional control plane. PCEP is used to communicate the curr= ent network state and to program flows. These proposals have their roots i= n the ACTN and PCECC architectures that are adopted within the TEAS working= group. TEAS is very much assuming that this is the direction that we want= to take PCEP in. However, there are two procedural issues, as I see it. > > 1. We have not had an explicit discussion in the PCE WG about whethe= r we want to take PCEP in this direction. We have had a few lively debates= on specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cth= in end of the wedge=E2=80=9D. If we start down this path then we are accep= ting that PCEP will replace the functions available in the traditional cont= rol plane. We need to test whether there is a consensus in the working gro= up to move in that direction. > > 2. We do not currently have a charter that allows us to add this typ= e of capability to PCEP. Depending on the outcome of discussion (1), we ca= n of course extend the charter. > >=20=20 > > This email is to initiate the discussion (1). So, please reply to the ma= iling list and share your thoughts on whether PCEP should be extended in th= is direction, and how far we should go. > >=20=20 > > I am hoping to get more than just =E2=80=9Cyes=E2=80=9D or =E2=80=9Cno=E2= =80=9D answers to this question (although that would be better than no answ= er). I would like to hear justifications for or against. Such as, which p= roduction networks would run PCEP in place of a traditional control plane? = Why is it not desirable to solve the problems in those networks with the t= raditional control plane? What harm could this do? What would be the oper= ational problems associated with adding these functions to PCEP? > >=20=20 > > Many thanks > > Jon > >=20=20 > > > > _______________________________________________ > 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. --------------9886C9AE93476F710620E571 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Hi Jon,

Thanks to open this thread. As many of you have already said, PCEP is already an SDN controller protocol since the work on stateful mode. But, IMHO, recent drafts doesn't go into the right direction. Let me explain:

1/ On PCE-LS. Of course there is already plenty of solution to learn the topo= logy e.g. listen to IGP protocol, BGP-LS ... But, dont forget that the primary goal of PCE is to compute a path on a topology. This mean that the PCE need a graph which represent the network topology. This graph is extract from the TED, later fulfil by the topology learning mechanism. Why PCE-LS and other equivalent mechanism that collect topology information on a node by node basis ? Simply because you are unable to guarantee that the graph you extract from what you learn is accurate. Indeed, a node known its interfaces through what the administrator configure in this node. But, it doesn't know exactly to which neighbour it is connected while there is a protocol between node. In IP network, it is the role of the IGP. if there is an error in the node configuration, the IGP adjacency doesn't fire up and thus, IGP or BGP-LS will not report this link betwenn the two nodes. The graph is not complete, but not wrong. So when you learn the topology from the IGP you could guarantee that the link between two nodes corresponds effectively to what is really configured and physically connected. If there is no protocol between the nodes= , you can't guarantee that what the node announce through PCEP-LS is accurate. E.g. Node A report Link A-= B and node B report Link B-A instead of Link B-C and Link B-C instead of Link B-A due to a wro= ng manu= al configuration. You obtain a wrong topology and thus a wrong graph as you invert two links between two nodes. An you have no way to check it. So, in any case, and it is true for Optical / Transport network, you MUST run an IGP in your network to be sure that the topology is accurate and so to guarantee that the PCE work on a correct graph. A PCE working on a bad topology is painful. So, because you must run an IGP in your network, fulfil the PCE TED by listen the IGP or BGP-LS is t= he best solution. IMHO, PCE WG must not work on alternative solution to learn topology.<= /font>
<= /font>

<= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu">2/ On PCE-CC: Why e= xtending PCE for such f= unctionality ? F= or IP/MPLS, it is a non sense to study such solution especially with Segment Routing where you need to configure the edge node. For Optical / Transport network, well, again, it is not the g= ood solution. First, vendor are opposed to open their ROADM to fine tune the configuration of the node <= font face=3D"Ubuntu">d= isregarding if the protocol is PCEP or Netc= onf. So, if you intend to control an Optical / Transport network through an SDN Controller, the best is to use GMPLS. This keep vendor adjust the lambda witho= ut discl= osing their I= PR. Of co= urse their is an initiative named OpenROADM which try to break this with its Transo= rtPCE project within OpenDayLight. But look at the spec: it is y= ang model + NetConf. Not PCEP + extension. Again, IMHO, it is not the good solution to study.<= /font>=

<= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu">3/ On PCECC-SR. This time, it could make s= ense. But, again, it is not the good way to proceed. In fact, when you u= se PCEP as control protocol, the node d= oesn't store the configuration l= ike it does with NetConf in the standard-config, but it is store in the ephemeral config. This means that when the PCEP session b= reak or the n= ode rel= oad, all the configuration is loos= e. If you need to wait PCE configuration to finish to boot e.g. advertise Segment Routing cap= abilities need SRG= B, p= refix SID ... it is not a safe solution. For that kind of information NetConf is superior to PCEP. In addition SPR= ING WG is working on yang model for NetCo= nf for this purpose. Not on PCEP extension. One more time, IMHO, PCE WG mu= st not spent energy in this direct= ion.<= /font>=

<= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu">4/ What is missing?= Yes. There is missing pieces in the puzzle. And s= pent energy to extra functions while essential ones are not ready is not the good way to progr= ess. I= 'm r= eferring to the traffic steering. I know that there is a very recent draft that propose a FlowSpec like in PCEP. Indeed, once a tunnel is setup t= hrough PCEP, you have no good tool to enforce the traffic in this newly created tunnel. Again, using NetConf is not a good i= dea as you mix ephemeral config and standard config. BGP-F= lowSpec is too close t= oo related to BGP and not ensure fine granularity you wish to steer the traffic into a tunnel. So,= IMHO, t= his is the direction where the WG must go.=
<= /font>

<= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu">N= ow, just to finish, c= an you raise hand in the room to count the number of operational network where R= SVP-TE is really used (I mean o= ther than tho= se used for FRR) ? number of operational network u= sing Segment Routing ? = And on this few subset the number that really use PCEP ? I= 'm pretty sure that I have sufficient finger in o= ne hand to count them. And, if I restrict them to which are really n= eed Path Computation w= ith constraints (I mean p= ath diversity, bandwidth reservation, delay con= straint ...= ) I will be very happy if one hand raise in the room. So, f= rom this poor operational usage, we a= bsolutely don't know if PCEP is stable, scale at large ... Can we guarantee that a PCE could mainta= in a PCEP session with all nodes in a large network (say 1000 nodes and m= ore) ? No. Because nobody r= eport on the WG such experience like other WG do. Do we h= ave interoperability issues ? Yes plenty. From all i= ndustri= al and Open Sou= rce PCE s= olutions I tested no one implement correctly all the RFC= s and recent drafts. So, before extending PCEP I suggest to concentrate on impleme= nting what is already available. Make large experiment, see what's happen. Debug, report, adjust. Then we could think about the future of PCEP when we will collect sufficient background and experience. Up to know, from what I experiment, the tech= nology is good, promi= sing, but too young.<= /font>=

<= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu"><= font face=3D"Ubuntu">my 2cts=

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<= /font>=


Le 20/07/2017 =C3=A0 17:22, Jonathan Hardwick a =C3=A9crit=C2=A0:

Dear PCE WG

=C2=A0

The purpose of this email is to initiate a discussion about whether we want to extend PCEP to allow it to replace the functions that are traditionally provided by the routing and signalling protocols.

=C2=A0

Originally, PCEP was designed with the goal of providing a distributed path computation service.=C2=A0 In recent years we have extended that mission, and added path modification and path instantiation capabilities to PCEP.=C2=A0 This has added capabilities to PCEP that would traditionally have been performed by the network management plane.

=C2=A0

We are now starting to discuss proposals to add more capabilities to PCEP =E2=80=93 capabilities that are traditionally part of routing and signalling.=C2=A0 There were three examples of this in the PCE working group meeting this week.

= =C2=B7=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The PCECC proposal, which extends PCEP=E2=80=99s path instantiation capability so tha= t the PCE can provision a path end-to-end by touching each hop along the path.=C2=A0 This replaces the function already provided by RSVP-TE.

= =C2=B7=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The PCEP-LS proposal, which extends PCEP to allow link state and TE information to be communicated from the network to the PCE.=C2=A0 This replaces the link state flooding function provided by the IGPs, or BGP-LS.

= =C2=B7=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The PCECC-SR proposal extends PCEP to allow device-level configuration to be communicated between the network and the PCE, such as SRGBs, prefix SIDs etc.=C2=A0 Again, this replaces functions that are already designed into the IGPs.

=C2=A0

These proposals are taking PCEP in the direction of being a fully-fledged SDN protocol.=C2=A0 With these proposals, one can envision a network in which there is no traditional control plane.=C2=A0 PCEP is used to communicate the current network state and to program flows.=C2=A0 These proposals have their roots in the ACTN and PCECC architectures that are adopted within the TEAS working group.=C2=A0 TEAS is very much assuming that this is the direction that we want to take PCEP in.=C2=A0 However, there are two procedural issues, as I see it.<= o:p>

1.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 We have not had an explicit discussion in the PCE WG about whether we want to take PCEP in this direction.=C2=A0 We have had a few lively debates on specific cases, like PCEP-LS, but those cases represent the =E2=80=9Cthin = end of the wedge=E2=80=9D.=C2=A0 If we start down this path then we a= re accepting that PCEP will replace the functions available in the traditional control plane.=C2=A0 We need to test whether there is a consensus in the working group to move in that direction.

2.=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 We do not currently have a charter that allows us to add this type of capability to PCEP.=C2=A0 Depending on the outcome of discussion (1), we can of course extend the charter.

=C2=A0

This email is to initiate the discussion (1).=C2=A0 So, please reply to the mailing list and share your thoughts on whether PCEP should be extended in this direction, and how far we should go.

=C2=A0

I am hoping to get more than just =E2=80=9Cy= es=E2=80=9D or =E2=80=9Cno=E2=80=9D answers to this question (although that woul= d be better than no answer).=C2=A0 I would like to hear justifications for or against.=C2=A0 Such as, which production networks would run PCEP = in place of a traditional control plane?=C2=A0 Why is it not desirab= le to solve the problems in those networks with the traditional control plane?=C2=A0 What harm could this do?=C2=A0 What would be= the operational problems associated with adding these functions to PCEP?

=C2=A0

Many thanks

Jon

=C2=A0



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-2.82 X-Spam-Level: X-Spam-Status: No, score=-2.82 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_COMMENT_SAVED_URL=1.391, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, T_HTML_ATTACH=0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id COJ_-RNkWBkD; Fri, 28 Jul 2017 03:37:14 -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 F2E061322C1; Fri, 28 Jul 2017 03:37:08 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml704-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DSF30652; Fri, 28 Jul 2017 10:37:06 +0000 (GMT) Received: from BLREML701-CAH.china.huawei.com (10.20.4.170) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.301.0; Fri, 28 Jul 2017 11:36:47 +0100 Received: from BLREML501-MBB.china.huawei.com ([10.20.5.200]) by blreml701-cah.china.huawei.com ([::1]) with mapi id 14.03.0301.000; Fri, 28 Jul 2017 16:06:34 +0530 From: Dhruv Dhody To: Dale Worley , "gen-art@ietf.org" CC: "draft-ietf-pce-pceps.all@ietf.org" , "pce@ietf.org" , "ietf@ietf.org" , Dhruv Dhody Thread-Topic: [Pce] Genart last call review of draft-ietf-pce-pceps-14 Thread-Index: AQHS+rw6zqPRSDFqSU+m/UcLVejzmaJXhnYg Date: Fri, 28 Jul 2017 10:36:34 +0000 Message-ID: <23CE718903A838468A8B325B80962F9B8CB95DF7@blreml501-mbb> References: <149982889725.9262.6380278547558008402@ietfa.amsl.com> In-Reply-To: <149982889725.9262.6380278547558008402@ietfa.amsl.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.18.149.39] Content-Type: multipart/mixed; boundary="_003_23CE718903A838468A8B325B80962F9B8CB95DF7blreml501mbb_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090203.597B13D3.01DE, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 97a2993c040c166ea2819edd2dfdf4b1 Archived-At: Subject: Re: [Pce] Genart last call review of draft-ietf-pce-pceps-14 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Jul 2017 10:37:22 -0000 --_003_23CE718903A838468A8B325B80962F9B8CB95DF7blreml501mbb_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Dale,=20 Thanks for your detailed review and providing suggested text.=20 Sorry for being a little late with this reply.=20 Please see inline... > -----Original Message----- > From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Dale Worley > Sent: 12 July 2017 08:38 > To: gen-art@ietf.org > Cc: draft-ietf-pce-pceps.all@ietf.org; pce@ietf.org; ietf@ietf.org > Subject: [Pce] Genart last call review of draft-ietf-pce-pceps-14 >=20 > Reviewer: Dale Worley > Review result: Ready with Nits >=20 > I am the assigned Gen-ART reviewer for this draft. The General Area > Review Team (Gen-ART) reviews all IETF documents being processed by the > IESG for the IETF Chair. Please treat these comments just like any other > last call comments. >=20 > For more information, please see the FAQ at > . >=20 > Document: draft-ietf-pce-pceps-14 > Reviewer: Dale R. Worley > Review Date: 2017-07-11 > IETF LC End Date: 2017-07-12 > IESG Telechat date: 2017-08-03 >=20 > Summary: >=20 > This draft is basically ready for publication, but has nits > that should be fixed before publication. >=20 > Nits/editorial comments: >=20 > A few of these may rise to the level of minor technical issues, > especially: > section 3.2: whether error TBA2/2 is distinct from error 1/1=20 [[Dhruv Dhody]] The context of these error are different, one is before TLS= establishment (startTLS) and another is during PCEP session establishment = (which is after TLS has been established). IMHO it is better to keep them d= istinct.=20 section 3.2: > the receipt of an PCErr during the failure of TLS > establishment [[Dhruv Dhody]] The idea behind Error TBA2/3 and TBA2/4, is to let the peer= know if it is unwilling (or willing) to establish PCEP session without TLS= from this peer. This is useful information to figure out how the peer shou= ld react without human intervention. =20 =20 > section 3.3: the distinction between StartTLSWait and OpenWait [[Dhruv Dhody]] Both timers are wait timers but they wait for different mes= sages and used in different context. Also the values can be set differently= based on the deployment.=20 > section 5: a full discussion of backward compatibility considerations [[Dhruv Dhody]] I have added some more details.=20 > section 8.2: MIB extension [[Dhruv Dhody]] I have added some more details. More details on above inline.=20 >=20 > 1. Introduction >=20 > This document describes a security container for the transport of > PCEP messages, and therefore they do not affect the flexibility and > extensibility of PCEP. >=20 > There is no plural antecedent for "they" to reference. I think you could > use "it", but the Editor may have better suggestions. >=20 [[Dhruv Dhody]] Ack > 3.2. Initiating the TLS Procedures >=20 > with a PCErr message with Error-Type set to [TBA2 by IANA] (PCEP > StartTLS failure) >=20 > It seems that we shouldn't use this Error-Type to object to the use of a > message other than Open and StartTLS as an initial message, as that error > isn't a misuse of StartTLS per se and is only incidentally related to > StartTLS. Indeed, isn't there already an Error-Type for this error > (unexpected initial message), since two RFC 5440 implementations can > commit/detect it? Looking at RFC 5440 section 7.15, I see: >=20 > Error-Type Meaning > 1 PCEP session establishment failure > Error-value=3D1: reception of an invalid Open message or > a non Open message. >=20 > It seems to me that this document is adjusting the meaning of error 1/1, > rather than defining a new error situation. >=20 [[Dhruv Dhody]] We wanted to differentiate between the message exchanges du= ring PCEP session establishment (which starts with open) and with StartTLS = (which starts with StartTLS). Note that in case of TLS, we would move to th= e PCEP session establishment phase after the TLS is established, and we cou= ld still receive error 1/1.=20 Regarding TBA2/2, in case of PCEPS, a peer could respond with StartTls, Ope= n or PCErr (but all in the context of this document), so we needed a new er= ror. The peer was expecting StartTLS related message but something else hap= pened and thus an error! IMHO putting this under "PCEP StartTLS failure" er= ror-type is better!=20 Do you feel strongly about changing this?=20 > If the PCEP speaker that does not support PCEPS, receives a StartTLS > message, it MUST behave according to the existing error mechanism > described in section 6.2 of [RFC5440] (in case message is received > prior to an Open message) or section 6.9 of [RFC5440] (for the case > of reception of unknown message). >=20 > I think you want s/MUST/will/, since the described behavior isn't > specified by this document, but rather by RFC 5440. [[Dhruv Dhody]] Ack, updated. >=20 > In any case, this paragraph might want to reference the backward- > compatibility consideration that I would expect to appear in section 5 -- > How does the PCEPS-supporting element deal with the non-PCEPS-supporting > element after the connection attempt with StartTLS fails? [[Dhruv Dhody]] I have added that in section 5.=20 >=20 > After the exchange of startTLS messages, if a PCEP speaker cannot > establish a TLS connection for some reason (e.g. the required > mechanisms for certificate revocation checking are not available), it > MUST return a PCErr message (in clear) with Error-Type set to [TBA2 > by IANA] (PCEP StartTLS failure) and Error-value set to: >=20 > s/startTLS/StartTLS/ [[Dhruv Dhody]] Ack. >=20 > Is there a well-defined way for a participant in a TLS connection start t= o > receive *either* a PCErr message in the clear *or* whatever comes next in > TLS setup -- and know which case has happened? Is there a way to use > popular modular TLS libraries and have the application above the library > receive such a PCErr message? I don't understand TLS nearly well enough > to know the answer to this, but it would probably help implementors if > answers were given to these questions. [[Dhruv Dhody]] If the TLS handshake is successful, both local and remote p= arties are aware of this. Same is the case for TLS failure. So receiving an= error message in clear will not be a surprise.=20 Also, I checked some of the other documents that describe the use of TLS, b= ut did not find any such handling.=20 >=20 > The peer MAY choose to re-establish the PCEP session > without TLS next. >=20 > I think you mean "The peer that initiated the connection MAY choose to re= - > establish ...". As written, "the peer" seems to refer to the peer that > generated the PCErr, but if it was the receiving peer that generated the > PCErr, you probably don't want it to attempt to re-establish the session > but rather wait for the initiating peer to do so. >=20 [[Dhruv Dhody]] Ack. Changed peer to receiver.=20 > Given the asymmetric nature of TLS for connection establishment it is > relevant to identify the roles of each of the PCEP peers in it. The > PCC SHALL act as TLS client, and the PCE SHALL act as TLS server, > according to [RFC5246]. >=20 > See comments re section 4 about terminology. I think you need to have > terms for the element that is initiating the connection (either a PCC or = a > PCE) and the element that is receiving the connection (always a PCE). >=20 [[Dhruv Dhody]] I have updated this.=20 > 3.3. The StartTLS Message >=20 > Once the TCP connection has been successfully established and the > StartTLS message sent, the sender MUST start a timer called > StartTLSWait timer, after the expiration of which, if no StartTLS > message has been received, it MUST send a PCErr message and releases > the TCP connection with Error-Type set to [TBA2 by IANA] and Error- > value set to 5 (no StartTLS message received before the expiration of > the StartTLSWait timer). A RECOMMENDED value for StartTLSWait timer > is 60 seconds. >=20 > Really, the timer is the time to wait for *any* message to received. > Open messages will cause start of upward-compatibility mechanisms (if any= ); > any other message will be immediately rejected as an error. >=20 > Indeed, isn't there already a timer which a peer uses to wait for the > other peer to send a message? Isn't StartTLSWait functionally the same a= s > OpenWait (RFC 5440 section 6.2)? >=20 [[Dhruv Dhody]] I have updated the description, but I would still like to k= eep a different timer similar to OpenWait and KeepWait (in the spirit of RF= C 5440).=20 > ... it MUST send a PCErr message and releases ... >=20 > This sentence is grammatically interesting. One part is logically "it > MUST send a PCErr message". The second part might be "it MUST release th= e > TCP connection", or "it releases the TCP connection". Strictly speaking, > the rules of English grammar cause the release/releases distinction to > disambiguate whether MUST applies to both parts or only to the first part= . > But I don't think you want to rely on that, and you want to say "... and > MUST release the TCP connection ...". [[Dhruv Dhody]] Updated. >=20 > 3.4. TLS Connection Establishment >=20 > 1. Immediately negotiate TLS sessions according to [RFC5246]. >=20 > In this case, you'd say "Immediately negotiate a TLS session ...". [[Dhruv Dhody]] Ack >=20 > 3.5. Peer Identity >=20 > At least the following parameters of the X.509 certificate SHOULD > be exposed: >=20 > o Peer's IP address >=20 > o Peer's fully qualified domain name (FQDN) >=20 > To the naive (me), these two items seem to refer to the TCP connection > that was established. But I suspect that they're intended to refer to th= e > IP address and FQDN that might be encoded in the certificate (as in, "The > following precedence applies: for DNS name validation, subjectAltName:DNS > has precedence over CN; for IP address validation, subjectAltName:iPAddr > has precedence over CN.") >=20 > And it seems that the actual remote IP address of the TCP connection and > whatever remote FQDN or IP address was used to initiate the connection > should also be exposed to the administrative system. >=20 > So I think there's room to expand on and clarify exactly the data items > that are intended here. [[Dhruv Dhody]] The statement above the list clearly state that this is the= information from X.509 certificate. The TCP socket IP address is definitely known and exposed as that this way = to identify a session. I have added this text -=20 "Note that the remote IP address used for the TCP session establishment is = also exposed." >=20 > 4. Discovery Mechanisms >=20 > A PCE can advertise its capability to support PCEPS using the IGP > advertisement and discovery mechanism. >=20 > If I understand this correctly, IGP is "Interior Gateway Protocol", and > it's a category of protocols, not a specific protocol. And what you're > saying is that a PCE can advertise using the relevant IGP's mechanism. I= n > that case, I think you'd say "the IGP's advertisement and discovery > mechanism". (Unless somehow IS-IS and OSPF are seen as variants of the > same protocol, which can generically be called IGP.) >=20 [[Dhruv Dhody]] Updated. > A new > capability flag bit for the PCE-CAP-FLAGS sub-TLV that can be > announced as attribute to distribute PCEP security support > information is proposed in [I-D.wu-pce-discovery-pceps-support] >=20 > s/announced as attribute/announced as an attribute/. >=20 [[Dhruv Dhody]] Updated. > But you don't want to say "is proposed in ..." because that suggests that > the proposal might not be approved, and you've already positively stated > "A PCE can advertise ...". So you want to say "A new capability flag ... > is defined in ..." -- and raise draft-wu-pce-discovery-pceps-support to a > normative reference. >=20 > Similar considerations apply to discovery via DNS > (draft-wu-pce-dns-pce-discovery) -- you want to mention it here and > consider it a normative reference. >=20 > -- Unless you choose to make this part of the section clearly hypothetica= l > by starting "This document does not specify any method a PCE can advertis= e > that it supports (or requires) PCEPS, but two mechanisms have been > proposed:" [[Dhruv Dhody]] I would like to avoid normative reference as these are=20 not mandatory and we would not want to block publication of this draft.=20 I have updated the text accordingly and removed the text from this document= =20 Regarding DNS.=20 >=20 > When DNS is used by a PCC (or a PCE acting as a client, for the rest > of the section, PCC refers to both) willing to use PCEPS to locate an > appropriate PCE [I-D.wu-pce-dns-pce-discovery], the PCC as an > initiating entity, chooses at least one of the returned FQDNs to > resolve, which it does by performing DNS "A" or "AAAA" lookups on the > FDQN. >=20 > s/FDQN/FQDN/ >=20 > This one sentence uses the terms "acting as a client" and "as an > initiating entity" to mean the same thing. You should fix on one term. > And given that the same concept arises in the discussion of TLS initiatio= n > (section 3.2), you probably want to define the term for "a PCC (or a PCE > acting as a client)" near the beginning as document-wide terminology. > Once you've got names for the concepts of the initiating entity and the > receiving entity, a number of things in the document can then be stated > more clearly. >=20 > If the PCC receives a response to its SRV query but it is not able to > establish a PCEPS connection using the data received in the response, > as initiating entity it MAY fall back to lookup a PCE that uses TCP > as transport. >=20 > This is unclear -- if the process of resolving the original FQDN into > addresses fails to produce an address that can be contacted, how can the > PCC "fall back to lookup a PCE that uses TCP as transport" -- it has > already done the looking up, and that failed. >=20 > I suspect you mean that the PCC is required to first attempt to contact > each address using TLS, and then only if all of those attempts fail is it > then permitted to fall back to using TCP. But you don't actually say tha= t. >=20 [[Dhruv Dhody]] I have removed the details from this document.=20 > 5. Backward Compatibility >=20 > It would help if this section gave a more comprehensive discussion of how > PCEPS-supporting PCEs/PCCs and non-PCEPS-supporting PCEs/PCCs can > interwork, i.e., how to incrementally deploy PCEPS into an AS. The two > major points seem to be (1) arranging that any two elements will > communicate with the highest level of security that they both implement, > and (2) any system of PCEPS-supporting and non-PCEPS-supporting elements > can interwork successfully. There probably are some "interesting" > management and security issues involved in this. >=20 [[Dhruv Dhody]] Updated.=20 If a PCEP implementation that does not support PCEPS receives a StartTLS message, it would behave according to the existing error mechanism of [RFC5440]. On receiving the error, based on the local policy, a peer could try to establishing PCEP session without TLS as per the procedures defined in [RFC5440]. For successful TLS operations with PCEP, both PCEP peers in the network would need to be upgraded to support this document. An existing PCEP session cannot be upgraded to PCEPS, the session needs to be terminated and reestablished as per the procedure described in this document. During the incremental upgrade, the PCEP speaker SHOULD allow session establishment with and without TLS. Once both PCEP speakers are upgraded to support PCEPS, the PCEP session is re-established with TLS, otherwise PCEP session without TLS is setup. A redundant PCE MAY also be used during the incremental deployment to take over the PCE undergoing upgrade. Once the upgrade is completed, support for unsecured version SHOULD be removed. > 6.2. New Error-Values >=20 > I've noted above that the function of Error-Type=3DTBA2/Error-Value=3D2 s= eems > to duplicate that of Error-Type=3D1/Error-Value=3D1. >=20 [[Dhruv Dhody]] See reply above.=20 > The meaning of Error-Type=3DTBA2 is named "StartTLS Failure" here, but th= e > rest of the text uses "StartTLS failure". The table given in RFC > 5440 section 7.15 is not consistent about capitalization in the names of > Error-Types, but most entries do not capitalize non-initial words. > That suggests "StartTLS failure" should be used here. [[Dhruv Dhody]] Ack. >=20 > 7. Security Considerations >=20 > There needs to be some consideration of interoperation of mixed PCEPS- > capable and non-PCEPS-capable elements (unless such mixtures are NOT > RECOMMENDED). >=20 [[Dhruv Dhody]] yes strict TLS is recommended.=20 . > 8.1. Control of Function and Policy >=20 > A PCEP implementation SHOULD allow configuring the following PCEP > security parameters: >=20 > o StartTLSWait timer value >=20 > PCEPS implementations MAY provide ... >=20 > If I read this correctly, there is only one security parameter in this > list. But since the text says "the following PCEP security parameters:", > on my first reading, I assumed that "PCEPS implementation MAY provide ...= " > was the beginning of a second item (with the initial "o" omitted). >=20 [[Dhruv Dhody]] Updated. > provide ways for the operator to complete the following tasks: >=20 > It looks like all of the following tasks are with regard to a selected > PCEP session, though only the first task is labeled as such, whereas the > 2nd through 4th are not. It seems like you want to say "to complete the > following tasks in regard to any PCEP session:" and change the 1st to > "Determine if the session is protected via PCEPS." >=20 [[Dhruv Dhody]] Updated. > 8.2. Information and Data Models >=20 > The PCEP MIB module SHOULD be extended to include PCEPS capabilities, > information, and status. >=20 > This isn't a "SHOULD" because it isn't a constraint on implementations, > it's a statement of what would be a desirable action by the IETF. -- > Unless the idea is that the implementor SHOULD add a (necessarily > proprietary) extension to the MIB. In any case, RFC 7420 should be > referenced.) >=20 [[Dhruv Dhody]] Ack. > 8.4. Verify Correct Operations >=20 > This section title is a verb phrase while the rest of the titles are noun > phrases. Perhaps "Verification of Correct Operations". >=20 [[Dhruv Dhody]] Changed to "Verifying Correct Operation". > 8.5. Requirements on Other Protocols >=20 > Mechanisms defined in this document do not imply any new requirements > on other protocols. >=20 > There is a correlated discovery mechanism: > draft-wu-pce-discovery-pceps-support defines a correlated change to OSPF > and IS-IS. I suppose that isn't *required* by this document, as draft-wu= - > pce-dns-pce-discovery or configuration might be used. But conceptually, > the two discovery mechanisms are implied by this document. >=20 [[Dhruv Dhody]] Ack. > 10.1. Normative References >=20 > It seems to me that draft-wu-pce-discovery-pceps-support and draft-wu-pce= - > dns-pce-discovery should be considered normative references. >=20 >=20 [[Dhruv Dhody]] Updated the text so that they could remain informative.=20 Thanks again for your review.=20 I have attached the working copy and the diff.=20 Regards, Dhruv > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce --_003_23CE718903A838468A8B325B80962F9B8CB95DF7blreml501mbb_ Content-Type: text/plain; name="draft-ietf-pce-pceps-15.txt" Content-Description: draft-ietf-pce-pceps-15.txt Content-Disposition: attachment; filename="draft-ietf-pce-pceps-15.txt"; size=44700; creation-date="Fri, 28 Jul 2017 10:21:02 GMT"; modification-date="Fri, 28 Jul 2017 10:21:02 GMT" Content-Transfer-Encoding: base64 CgoKClBDRSBXb3JraW5nIEdyb3VwICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg 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with ESMTP id v6V0uRSa003558; Sun, 30 Jul 2017 20:56:27 -0400 Received: (from worley@localhost) by hobgoblin.ariadne.com (8.14.7/8.14.7/Submit) id v6V0uQNr003555; Sun, 30 Jul 2017 20:56:26 -0400 X-Authentication-Warning: hobgoblin.ariadne.com: worley set sender to worley@alum.mit.edu using -f From: worley@ariadne.com (Dale R. Worley) To: Dhruv Dhody Cc: gen-art@ietf.org, draft-ietf-pce-pceps.all@ietf.org, pce@ietf.org, ietf@ietf.org, dhruv.ietf@gmail.com In-Reply-To: <23CE718903A838468A8B325B80962F9B8CB95DF7@blreml501-mbb> (dhruv.dhody@huawei.com) Sender: worley@ariadne.com (Dale R. Worley) Date: Sun, 30 Jul 2017 20:56:26 -0400 Message-ID: <87379de85h.fsf@hobgoblin.ariadne.com> X-CMAE-Envelope: MS4wfNGHrMV/tGkmygmWI5IRePHJtXqX3uLOLhLbpZdSkmRczGUQym/ZvG+Nqms6C2BERBO0JLgOlrBd9gVfa2jUiHC5kLFNUgibcHVdaRBYGXj1XEw44B1i yuEvM+TMVffGHuM+itU8q/WWqOnOR+SAxY4OaEqvQdCaRw8w/SvMyChH3W8AvzCpWrVyCbBiqoSJ+zSb3EOZ6rR6ZUP7AtjhvlnKpo3Fzu97+qcnqIDu8ysk 2RrNkZYReRGtFWJJHmmDH0Bni+ObyocW/VvmASMewlBHWAruWvoxeZtcSU+A/URo2zVAFYY356UFCSma351hAw== Archived-At: Subject: Re: [Pce] Genart last call review of draft-ietf-pce-pceps-14 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2017 00:56:32 -0000 Dhruv Dhody writes: The bulk of these items I either agree with completely or am willing to defer to your judgment. The items that seem to merit further discussion are below. Most of these items are consolidations of several remarks I made that seem to be the same fundamental question. >> section 3.2: whether error TBA2/2 is distinct from error 1/1 > [[Dhruv Dhody]] The context of these error are different, one is > before TLS establishment (startTLS) and another is during PCEP session > establishment (which is after TLS has been established). IMHO it is > better to keep them distinct. It's more complicated than that: If a PCE does not like the first message it receives, if it implements PCEPS, it replies TBA2/2. But if it does not implement PCEPS, it replies 1/1. Similarly, a PCC may reject an initial message with either of these error codes, depending on the situation. If the other endpoint does not implement PCEPS, it might be surprised by receiving TBA2/2, which it has no way of understanding in detail (although it will probably simply disconnect, which is what it would do in reaction to a 1/1). A non-implementing endpoint rejects an initial message only with 1/1. OTOH, once TLS has been established, then both endpoints can only object to the first encrypted message with 1/1. There's nothing intrinsically incorrect about this, but it is rather complicated, particularly in the upward-compatibility case where the PCC is willing to accept either PCEPS-implementing or non-PCEPS-implementing connections. >> section 3.3: the distinction between StartTLSWait and OpenWait > [[Dhruv Dhody]] Both timers are wait timers but they wait for > different messages and used in different context. Also the values can > be set differently based on the deployment. There's a complication if a PCE allows both PCEPS and PCEP connections. In that case, it does not send its initial message until it receives a message from the PCC. If the message is StartTLS, the PCC wants to connect using PCEPS and the PCE sends StartTLS; if the message is Open, the PCC wants to connect using PCEP and the PCE sends Open. The question is, what timeout does the PCE use while waiting for the initial message? If the connection *will be* PCEPS, it should use StartTLSWait (per draft-ietf-pce-pceps), if the connection *will be* PCEP, it should use OpenWait (per RFC 5440). But it does not have the information to choose the timer. The difficulty is that initially, the PCE is simulating both a PCEP and a PCEPS device, and using the message it receives from the PCC to disambiguate its situation. But the timeout values prescribed for the two situations are different. My feeling is that the two situations -- waiting for Open and waiting for StartTLS -- are not sufficiently distinguishable to allow prescribing two different timers. Of course, this could be cured by proper configuration -- giving the same value to StartTLSWait and OpenWait. OTOH, once TLS has been established and the Open messages are awaited, both endpoints use OpenWait. However, this situation is not really the same as when the TCP connection has been just been established. And yet, a PCE may be obligated to use the same timer for both situations. >> 3.2. Initiating the TLS Procedures ... > Do you feel strongly about changing this? Of course, I'm only a reviewer, you needn't defer to my opinion about anything. >> Is there a well-defined way for a participant in a TLS connection start to >> receive *either* a PCErr message in the clear *or* whatever comes next in >> TLS setup -- and know which case has happened? Is there a way to use >> popular modular TLS libraries and have the application above the library >> receive such a PCErr message? I don't understand TLS nearly well enough >> to know the answer to this, but it would probably help implementors if >> answers were given to these questions. > > [[Dhruv Dhody]] If the TLS handshake is successful, both local and > remote parties are aware of this. Same is the case for TLS failure. So > receiving an error message in clear will not be a surprise. > > Also, I checked some of the other documents that describe the use of > TLS, but did not find any such handling. OK, I think I understand now; my previous comment was based on a misunderstanding. The correct sequence of operations for PCEPS setup is: Both endpoints send a StartTLS to each other. After that, the initiator starts the TLS setup. Alternatively, the PCC sends StartTLS and the non-PCEPS-implementing PCE sends a PCErr. In either case, the PCC sends a StartTLS and then listens for a PCEP message in response. In any case, neither endpoint is ever in a situation where it could receive either a PCEP message or a TLS setup message. >> 5. Backward Compatibility ... > [[Dhruv Dhody]] Updated. > > If a PCEP implementation that does not support PCEPS receives a > StartTLS message, ... I think this is a significant improvement, as you can never be too careful about upward-compatibility issues, especially when security is involved. -- Concerning the figures: +-+-+ +-+-+ |PCC| |PCE| +-+-+ +-+-+ | | Does not send | StartTLS | StartTLS as |-------------------->| cannot establish | | TLS | | |<--------------------| Send Error | PCErr | Error-Value 3/4 | | Figure 2: Both PCEP Speaker supports PCEPS, But cannot establish TLS +-+-+ +-+-+ |PCC| |PCE| +-+-+ +-+-+ | | Does not support | StartTLS | PCEPS and thus | msg | sends Open |------- | | \ Open | | \ msg | | \ ---------| | \/ | | /\ | | / -------->| | / | |<------ | | | |<--------------------| Send Error | PCErr | (non-Open message | | received) Figure 3: One PCEP Speaker does not support PCEPS IIUC, in Figure 2 the error has error-value 3/4 and is "Not supported object" ... is that right? I'd think it would be TBA2/4, "Failure, connection without TLS possible" (or TBA2/3, depending on circumstances). And in Figure 3, the error is 1/1. It seems like it would be clearer if both the number and the text were shown for the error messages in both the figures. Is there also this flow? +-+-+ +-+-+ |PCC| |PCE| +-+-+ +-+-+ | | Does not support | StartTLS | PCEPS and thus | msg | sends Open |------- | | \ Open | | \ msg | | \ ---------| | \/ | | /\ | | / -------->| | / | |<------ | | | |-------------------->| | PCErr | | | Where the error indicates "Expecting a StartTLS but received an Open"? Or is this situation always signaled by the receiver (as in Figure 3) rather than the initiator? Dale From nobody Mon Jul 31 06:36:30 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C55313229E; Mon, 31 Jul 2017 06:36:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.819 X-Spam-Level: X-Spam-Status: No, score=-2.819 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_COMMENT_SAVED_URL=1.391, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, T_HTML_ATTACH=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Fw_ogWTNCuSg; Mon, 31 Jul 2017 06:36:14 -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 23BF312EA95; Mon, 31 Jul 2017 06:36:12 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DSK43203; Mon, 31 Jul 2017 13:36:09 +0000 (GMT) Received: from BLREML703-CAH.china.huawei.com (10.20.4.172) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.301.0; Mon, 31 Jul 2017 14:36:03 +0100 Received: from BLREML501-MBB.china.huawei.com ([10.20.5.200]) by blreml703-cah.china.huawei.com ([::1]) with mapi id 14.03.0301.000; Mon, 31 Jul 2017 19:05:51 +0530 From: Dhruv Dhody To: "'Dale R. Worley'" CC: "gen-art@ietf.org" , "draft-ietf-pce-pceps.all@ietf.org" , "pce@ietf.org" , "ietf@ietf.org" , "dhruv.ietf@gmail.com" Thread-Topic: [Pce] Genart last call review of draft-ietf-pce-pceps-14 Thread-Index: AQHTCZfWzqPRSDFqSU+m/UcLVejzmaJtQ7rA Date: Mon, 31 Jul 2017 13:35:50 +0000 Message-ID: <23CE718903A838468A8B325B80962F9B8CB962D9@blreml501-mbb> References: <23CE718903A838468A8B325B80962F9B8CB95DF7@blreml501-mbb> (dhruv.dhody@huawei.com) <87379de85h.fsf@hobgoblin.ariadne.com> In-Reply-To: <87379de85h.fsf@hobgoblin.ariadne.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.18.77.55] Content-Type: multipart/mixed; boundary="_003_23CE718903A838468A8B325B80962F9B8CB962D9blreml501mbb_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020201.597F324A.00F1, ss=1, re=0.000, recu=0.000, reip=0.000, vtr=str, vl=0, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 97a2993c040c166ea2819edd2dfdf4b1 Archived-At: Subject: Re: [Pce] Genart last call review of draft-ietf-pce-pceps-14 X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2017 13:36:20 -0000 --_003_23CE718903A838468A8B325B80962F9B8CB962D9blreml501mbb_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Dale, Thanks for your further comments, please see inline.. > -----Original Message----- > From: Dale R. Worley [mailto:worley@ariadne.com] > Sent: 31 July 2017 06:26 > To: Dhruv Dhody > Cc: gen-art@ietf.org; draft-ietf-pce-pceps.all@ietf.org; pce@ietf.org; > ietf@ietf.org; dhruv.ietf@gmail.com > Subject: Re: [Pce] Genart last call review of draft-ietf-pce-pceps-14 >=20 > Dhruv Dhody writes: >=20 > The bulk of these items I either agree with completely or am willing to > defer to your judgment. The items that seem to merit further discussion > are below. Most of these items are consolidations of several remarks I > made that seem to be the same fundamental question. >=20 > >> section 3.2: whether error TBA2/2 is distinct from error 1/1 >=20 > > [[Dhruv Dhody]] The context of these error are different, one is > > before TLS establishment (startTLS) and another is during PCEP session > > establishment (which is after TLS has been established). IMHO it is > > better to keep them distinct. >=20 > It's more complicated than that: If a PCE does not like the first messag= e > it receives, if it implements PCEPS, it replies TBA2/2. But if it does > not implement PCEPS, it replies 1/1. Similarly, a PCC may reject an > initial message with either of these error codes, depending on the > situation. If the other endpoint does not implement PCEPS, it might be > surprised by receiving TBA2/2, which it has no way of understanding in > detail (although it will probably simply disconnect, which is what it > would do in reaction to a 1/1). >=20 [[Dhruv Dhody]] You are right about this case, which I have clarified now -= =20 If the PCEP speaker that only supports PCEPS connection (as a local policy), receives an Open message, it MUST treat it as an unexpected message and reply with a PCErr message with Error-Type set to 1 (PCEP session establishment failure) and Error-value set to 1 (reception of an invalid Open message or a non Open message). In your description you mentioned the error TBA2/2, but the description of = TBA2/2 is -=20 A PCEP speaker receiving any other message apart from StartTLS, Open, or PCErr as the first message, MUST treat it as an unexpected message and reply with a PCErr message with Error-Type set to [TBA2 by IANA] (PCEP StartTLS failure) and Error-value set to 2 (reception of any other message apart from StartTLS, Open, or PCErr message), and MUST close the TCP connection. So receiving of open message would not trigger this error. The new text abo= ve would take care of that.=20 > A non-implementing endpoint rejects an initial message only with 1/1. >=20 > OTOH, once TLS has been established, then both endpoints can only object > to the first encrypted message with 1/1. >=20 > There's nothing intrinsically incorrect about this, but it is rather > complicated, particularly in the upward-compatibility case where the PCC > is willing to accept either PCEPS-implementing or non-PCEPS-implementing > connections. >=20 [[Dhruv Dhody]] I have created a table that describe all the cases as part = the updated text. =20 See https://github.com/dhruvdhody-huawei/ietf/raw/master/Compare.pdf=20 > >> section 3.3: the distinction between StartTLSWait and OpenWait >=20 > > [[Dhruv Dhody]] Both timers are wait timers but they wait for > > different messages and used in different context. Also the values can > > be set differently based on the deployment. >=20 > There's a complication if a PCE allows both PCEPS and PCEP connections. > In that case, it does not send its initial message until it receives a > message from the PCC. If the message is StartTLS, the PCC wants to > connect using PCEPS and the PCE sends StartTLS; if the message is Open, > the PCC wants to connect using PCEP and the PCE sends Open. >=20 > The question is, what timeout does the PCE use while waiting for the > initial message? If the connection *will be* PCEPS, it should use > StartTLSWait (per draft-ietf-pce-pceps), if the connection *will be* PCEP= , > it should use OpenWait (per RFC 5440). But it does not have the > information to choose the timer. The difficulty is that initially, the > PCE is simulating both a PCEP and a PCEPS device, and using the message i= t > receives from the PCC to disambiguate its situation. But the timeout > values prescribed for the two situations are different. >=20 > My feeling is that the two situations -- waiting for Open and waiting for > StartTLS -- are not sufficiently distinguishable to allow prescribing two > different timers. Of course, this could be cured by proper configuration > -- giving the same value to StartTLSWait and OpenWait. >=20 > OTOH, once TLS has been established and the Open messages are awaited, > both endpoints use OpenWait. However, this situation is not really the > same as when the TCP connection has been just been established. And yet, > a PCE may be obligated to use the same timer for both situations. >=20 [[Dhruv Dhody]] You have noted something important, thanks for that.=20 I would like to fix this by making sure that a PCEP speaker that supports P= CEPS does not start OpenWait timer immediately after TCP session, it uses S= tartTLSWait timer instead.=20 I would clarify that the OpenWait timer should be started after TLS establi= shment only.=20 So a PCE that supports connection with TLS only or with/without TLS, it wou= ld use StartTLSWait timer initially, the OpenWait timer is started once the= TLS is established.=20 I also state the StartTLSWait should never be set less than OpenWait timer.= =20 Please see the diff, I hope these changes should solve the issue. =20 > >> 3.2. Initiating the TLS Procedures > ... > > Do you feel strongly about changing this? >=20 > Of course, I'm only a reviewer, you needn't defer to my opinion about > anything. >=20 > >> Is there a well-defined way for a participant in a TLS connection > >> start to receive *either* a PCErr message in the clear *or* whatever > >> comes next in TLS setup -- and know which case has happened? Is > >> there a way to use popular modular TLS libraries and have the > >> application above the library receive such a PCErr message? I don't > >> understand TLS nearly well enough to know the answer to this, but it > >> would probably help implementors if answers were given to these > questions. > > > > [[Dhruv Dhody]] If the TLS handshake is successful, both local and > > remote parties are aware of this. Same is the case for TLS failure. So > > receiving an error message in clear will not be a surprise. > > > > Also, I checked some of the other documents that describe the use of > > TLS, but did not find any such handling. >=20 > OK, I think I understand now; my previous comment was based on a > misunderstanding. The correct sequence of operations for PCEPS setup is: > Both endpoints send a StartTLS to each other. After that, the initiator > starts the TLS setup. Alternatively, the PCC sends StartTLS and the non- > PCEPS-implementing PCE sends a PCErr. In either case, the PCC sends a > StartTLS and then listens for a PCEP message in response. > In any case, neither endpoint is ever in a situation where it could > receive either a PCEP message or a TLS setup message. >=20 > >> 5. Backward Compatibility > ... > > [[Dhruv Dhody]] Updated. > > > > If a PCEP implementation that does not support PCEPS receives a > > StartTLS message, ... >=20 > I think this is a significant improvement, as you can never be too carefu= l > about upward-compatibility issues, especially when security is involved. >=20 > -- >=20 > Concerning the figures: >=20 > +-+-+ +-+-+ > |PCC| |PCE| > +-+-+ +-+-+ > | | Does not send > | StartTLS | StartTLS as > |-------------------->| cannot establish > | | TLS > | | > |<--------------------| Send Error > | PCErr | Error-Value 3/4 > | | >=20 >=20 > Figure 2: Both PCEP Speaker supports PCEPS, But cannot establish TLS >=20 >=20 > +-+-+ +-+-+ > |PCC| |PCE| > +-+-+ +-+-+ > | | Does not support > | StartTLS | PCEPS and thus > | msg | sends Open > |------- | > | \ Open | > | \ msg | > | \ ---------| > | \/ | > | /\ | > | / -------->| > | / | > |<------ | > | | > |<--------------------| Send Error > | PCErr | (non-Open message > | | received) >=20 >=20 > Figure 3: One PCEP Speaker does not support PCEPS >=20 > IIUC, in Figure 2 the error has error-value 3/4 and is "Not supported > object" ... is that right? I'd think it would be TBA2/4, "Failure, > connection without TLS possible" (or TBA2/3, depending on circumstances). > And in Figure 3, the error is 1/1. It seems like it would be clearer if > both the number and the text were shown for the error messages in both th= e > figures. >=20 [[Dhruv Dhody]] Error-Value 3/4 meant Error TBA2/3 and Error TBA2/4 as I wa= s focusing only on the error-values and not on error-type, but I agree this= could be confusing and I have updated the figures. Also I have added some = more figures.=20 > Is there also this flow? >=20 > +-+-+ +-+-+ > |PCC| |PCE| > +-+-+ +-+-+ > | | Does not support > | StartTLS | PCEPS and thus > | msg | sends Open > |------- | > | \ Open | > | \ msg | > | \ ---------| > | \/ | > | /\ | > | / -------->| > | / | > |<------ | > | | > |-------------------->| > | PCErr | > | | >=20 > Where the error indicates "Expecting a StartTLS but received an Open"? > Or is this situation always signaled by the receiver (as in Figure 3) > rather than the initiator? [[Dhruv Dhody]] The text has been added which is generic and works for bot= h PCC/PCE. =20 I don't think we need a figure for that :) Thanks again for your reviews.=20 The diff between the last update and this is attached.=20 Working copy, Diff: https://github.com/dhruvdhody-huawei/ietf Regards, Dhruv=20 =20 >=20 > Dale --_003_23CE718903A838468A8B325B80962F9B8CB962D9blreml501mbb_ Content-Type: text/html; name="Diff_ draft-ietf-pce-pceps-15-old.txt - draft-ietf-pce-pceps-15.txt.html" Content-Description: Diff_ draft-ietf-pce-pceps-15-old.txt - draft-ietf-pce-pceps-15.txt.html Content-Disposition: attachment; filename="Diff_ draft-ietf-pce-pceps-15-old.txt - draft-ietf-pce-pceps-15.txt.html"; size=91462; creation-date="Mon, 31 Jul 2017 13:26:35 GMT"; modification-date="Mon, 31 Jul 2017 13:26:35 GMT" Content-Transfer-Encoding: base64 PCFET0NUWVBFIGh0bWwgUFVCTElDICItLy9XM0MvL0RURCBYSFRNTCAxLjAgVHJhbnNpdGlvbmFs Ly9FTiIgImh0dHA6Ly93d3cudzMub3JnL1RSL3hodG1sMS9EVEQveGh0bWwxLXRyYW5zaXRpb25h 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text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?Mirja_K=C3=BChlewind?= To: "The IESG" Cc: draft-ietf-pce-pceps@ietf.org, Cyril Margaria , pce-chairs@ietf.org, cmargaria@juniper.net, pce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.58.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150151765756.6490.4914666200490803951.idtracker@ietfa.amsl.com> Date: Mon, 31 Jul 2017 09:14:17 -0700 Archived-At: Subject: [Pce] =?utf-8?q?Mirja_K=C3=BChlewind=27s_No_Objection_on_draft-ie?= =?utf-8?q?tf-pce-pceps-14=3A_=28with_COMMENT=29?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2017 16:14:17 -0000 Mirja Kühlewind has entered the following ballot position for draft-ietf-pce-pceps-14: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-pce-pceps/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- One high level comment: As already mentioned by the gen-art review (Thanks Dale for the detailed review!), for me the text was for a long time while reading not clear on who starts the TLS negotiation. In think there is a statement missing that a speaker/PCE that supports PCEPS and receives a StartTLS message MUST reply with a StartTLS message and further the PCC MUST initiation the TLS after reception of a StartTLS message from the PCC. More minor/editorial comments: 1) There are two cases where the behavior of speakers that do not support PCEPS is specified, which is a bit non-sensical given that not support probably means it does not follow this spec: OLD "If the PCEP speaker that does not support PCEPS, receives a StartTLS message, it MUST behave according to the existing error mechanism described in section 6.2 of [RFC5440] (in case message is received prior to an Open message) or section 6.9 of [RFC5440] (for the case of reception of unknown message)." NEW "If the PCEP speaker that does not support PCEPS, receives a StartTLS message, it will behave according to the existing error mechanism described in section 6.2 of [RFC5440] (in case message is received prior to an Open message) or section 6.9 of [RFC5440] (for the case of reception of unknown message)." and OLD "A PCEP speaker that does not support PCEPS or has learned the peer willingness to reestablish session without TLS, can send the Open message directly, as per [RFC5440]." NEW "A PCEP speaker that does not support PCEPS sends the Open message directly, as per [RFC5440]. A PCEP speaker that supports PCEPS but has previously already learned the peer willingness to reestablish session without TLS, MAY send the Open message directly, as per [RFC5440]." 2) As already mentioned in the gen-art review, I also think there should be more text on what a host should do that uses StartTLS but gets an error back. This is defined previously in the document but given there is an own section here, I would just recommend to re-iterate there. In other words please add the proposed text! 3) Why is this a MUST? sec 8.1 "A PCE or PCC implementation MUST allow configuring the PCEP security via TLS capabilities as described in this document." Wouldn't a SHOULD be enough/better? Meaning that when PCEPS is implemented and turned on by default, I don't necessarily have to provide a knob to turn it off? 4) Also related to the previous point sec 8.2 "An implementation SHOULD allow the operator to configure the PCEPS capability and various TLS related parameters, ..." Probably this part of sentence should not be normative given this part is (differently) specified in the previous section. From nobody Mon Jul 31 10:38:11 2017 Return-Path: X-Original-To: pce@ietfa.amsl.com Delivered-To: pce@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B696D132705; Mon, 31 Jul 2017 10:38:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.819 X-Spam-Level: X-Spam-Status: No, score=-2.819 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_COMMENT_SAVED_URL=1.391, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, T_HTML_ATTACH=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5EjqgLdgt6M7; Mon, 31 Jul 2017 10:37:49 -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 9B24213262A; Mon, 31 Jul 2017 10:37:47 -0700 (PDT) Received: from 172.18.7.190 (EHLO LHREML714-CAH.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DSK79016; Mon, 31 Jul 2017 17:37:45 +0000 (GMT) Received: from BLREML405-HUB.china.huawei.com (10.20.4.41) by LHREML714-CAH.china.huawei.com (10.201.108.37) with Microsoft SMTP Server (TLS) id 14.3.301.0; Mon, 31 Jul 2017 18:37:42 +0100 Received: from BLREML501-MBB.china.huawei.com ([10.20.5.200]) by BLREML405-HUB.china.huawei.com ([10.20.4.41]) with mapi id 14.03.0301.000; Mon, 31 Jul 2017 23:07:28 +0530 From: Dhruv Dhody To: =?utf-8?B?TWlyamEgS8O8aGxld2luZA==?= , The IESG CC: "cmargaria@juniper.net" , "draft-ietf-pce-pceps@ietf.org" , "pce@ietf.org" , "pce-chairs@ietf.org" Thread-Topic: =?utf-8?B?W1BjZV0gTWlyamEgS8O8aGxld2luZCdzIE5vIE9iamVjdGlvbiBvbiBkcmFm?= =?utf-8?Q?t-ietf-pce-pceps-14:_(with_COMMENT)?= Thread-Index: AQHTChgeklp+iLToOEGXE76qE/8+oKJuInMQ Date: Mon, 31 Jul 2017 17:37:28 +0000 Message-ID: <23CE718903A838468A8B325B80962F9B8CB964A8@blreml501-mbb> References: <150151765756.6490.4914666200490803951.idtracker@ietfa.amsl.com> In-Reply-To: <150151765756.6490.4914666200490803951.idtracker@ietfa.amsl.com> Accept-Language: en-GB, zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.18.76.154] Content-Type: multipart/mixed; boundary="_003_23CE718903A838468A8B325B80962F9B8CB964A8blreml501mbb_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.597F6AE9.025F, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 08345d090797ddfbb94877a040bb88b1 Archived-At: Subject: Re: [Pce] =?utf-8?q?Mirja_K=C3=BChlewind=27s_No_Objection_on_draft-i?= =?utf-8?q?etf-pce-pceps-14=3A_=28with_COMMENT=29?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2017 17:38:01 -0000 --_003_23CE718903A838468A8B325B80962F9B8CB964A8blreml501mbb_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgTWlyamEsIA0KDQo+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tDQo+IEZyb206IFBjZSBb bWFpbHRvOnBjZS1ib3VuY2VzQGlldGYub3JnXSBPbiBCZWhhbGYgT2YgTWlyamEgS8O8aGxld2lu ZA0KPiBTZW50OiAzMSBKdWx5IDIwMTcgMjE6NDQNCj4gVG86IFRoZSBJRVNHIDxpZXNnQGlldGYu b3JnPg0KPiBDYzogY21hcmdhcmlhQGp1bmlwZXIubmV0OyBkcmFmdC1pZXRmLXBjZS1wY2Vwc0Bp ZXRmLm9yZzsgcGNlQGlldGYub3JnOw0KPiBwY2UtY2hhaXJzQGlldGYub3JnDQo+IFN1YmplY3Q6 IFtQY2VdIE1pcmphIEvDvGhsZXdpbmQncyBObyBPYmplY3Rpb24gb24gZHJhZnQtaWV0Zi1wY2Ut cGNlcHMtMTQ6DQo+ICh3aXRoIENPTU1FTlQpDQo+IA0KPiBNaXJqYSBLw7xobGV3aW5kIGhhcyBl bnRlcmVkIHRoZSBmb2xsb3dpbmcgYmFsbG90IHBvc2l0aW9uIGZvcg0KPiBkcmFmdC1pZXRmLXBj 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(93.236.36.38) by kuehlewind.net with ESMTPSA (DHE-RSA-AES256-SHA encrypted, authenticated); 31 Jul 2017 19:45:41 +0200 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) From: "Mirja Kuehlewind (IETF)" In-Reply-To: <23CE718903A838468A8B325B80962F9B8CB964A8@blreml501-mbb> Date: Mon, 31 Jul 2017 19:45:38 +0200 Cc: The IESG , "cmargaria@juniper.net" , "draft-ietf-pce-pceps@ietf.org" , "pce@ietf.org" , "pce-chairs@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <7782F235-663A-416A-A425-E854EA58AA29@kuehlewind.net> References: <150151765756.6490.4914666200490803951.idtracker@ietfa.amsl.com> <23CE718903A838468A8B325B80962F9B8CB964A8@blreml501-mbb> To: Dhruv Dhody X-Mailer: Apple Mail (2.3273) X-PPP-Message-ID: <20170731174542.16069.63440@lvps83-169-45-111.dedicated.hosteurope.de> X-PPP-Vhost: kuehlewind.net Archived-At: Subject: Re: [Pce] =?utf-8?q?Mirja_K=C3=BChlewind=27s_No_Objection_on_draft-i?= =?utf-8?q?etf-pce-pceps-14=3A_=28with_COMMENT=29?= X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2017 17:45:48 -0000 Great, thanks! Given basically no other Ad have stated a position yet, I = would actually recommend to submit the update now, so the other AD can = review the next version. Mirja > Am 31.07.2017 um 19:37 schrieb Dhruv Dhody : >=20 > Hi Mirja,=20 >=20 >> -----Original Message----- >> From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Mirja K=C3=BChlewi= nd >> Sent: 31 July 2017 21:44 >> To: The IESG >> Cc: cmargaria@juniper.net; draft-ietf-pce-pceps@ietf.org; = pce@ietf.org; >> pce-chairs@ietf.org >> Subject: [Pce] Mirja K=C3=BChlewind's No Objection on = draft-ietf-pce-pceps-14: >> (with COMMENT) >>=20 >> Mirja K=C3=BChlewind has entered the following ballot position for >> draft-ietf-pce-pceps-14: No Objection >>=20 >> When responding, please keep the subject line intact and reply to all >> email addresses included in the To and CC lines. (Feel free to cut = this >> introductory paragraph, however.) >>=20 >>=20 >> Please refer to = https://www.ietf.org/iesg/statement/discuss-criteria.html >> for more information about IESG DISCUSS and COMMENT positions. >>=20 >>=20 >> The document, along with other ballot positions, can be found here: >> https://datatracker.ietf.org/doc/draft-ietf-pce-pceps/ >>=20 >>=20 >>=20 >> = ---------------------------------------------------------------------- >> COMMENT: >> = ---------------------------------------------------------------------- >>=20 >> One high level comment: >>=20 >> As already mentioned by the gen-art review (Thanks Dale for the = detailed >> review!), for me the text was for a long time while reading not clear = on >> who starts the TLS negotiation. In think there is a statement missing = that >> a speaker/PCE that supports PCEPS and receives a StartTLS message = MUST >> reply with a StartTLS message and further the PCC MUST initiation the = TLS >> after reception of a StartTLS message from the PCC. >>=20 > [[[Dhruv Dhody]]] As part of handling of Dale's comments, this has = been clarified.=20 >=20 > I have also added some text at the start of section 3.2 to make this = super clear.=20 >=20 >> More minor/editorial comments: >>=20 >> 1) There are two cases where the behavior of speakers that do not = support >> PCEPS is specified, which is a bit non-sensical given that not = support >> probably means it does not follow this spec: >> OLD >> "If the PCEP speaker that does not support PCEPS, receives a StartTLS >> message, it MUST behave according to the existing error mechanism >> described in section 6.2 of [RFC5440] (in case message is received >> prior to an Open message) or section 6.9 of [RFC5440] (for the case >> of reception of unknown message)." >> NEW >> "If the PCEP speaker that does not support PCEPS, receives a StartTLS >> message, it will behave according to the existing error mechanism >> described in section 6.2 of [RFC5440] (in case message is received >> prior to an Open message) or section 6.9 of [RFC5440] (for the case >> of reception of unknown message)." >=20 > [[[Dhruv Dhody]]] Ack, was updated as part of Gen-ART.=20 >=20 >> and >> OLD >> "A PCEP speaker that does not support PCEPS or has learned the peer >> willingness to reestablish session without TLS, can send the Open >> message directly, as per [RFC5440]." >> NEW >> "A PCEP speaker that does not support PCEPS sends the Open message >> directly, as per [RFC5440]. >> A PCEP speaker that supports PCEPS but has previously already learned = the >> peer >> willingness to reestablish session without TLS, MAY send the Open >> message directly, as per [RFC5440]." >>=20 > [[[Dhruv Dhody]]] Ack, updated.=20 >=20 >> 2) As already mentioned in the gen-art review, I also think there = should >> be more text on what a host should do that uses StartTLS but gets an = error >> back. >> This is defined previously in the document but given there is an own >> section here, I would just recommend to re-iterate there. In other = words >> please add the proposed text! > [[[Dhruv Dhody]]] Ack, updated. >>=20 >> 3) Why is this a MUST? >> sec 8.1 "A PCE or PCC implementation MUST allow configuring the PCEP >> security >> via TLS capabilities as described in this document." >> Wouldn't a SHOULD be enough/better? Meaning that when PCEPS is >> implemented and turned on by default, I don't necessarily have to = provide >> a knob to turn it off? > [[[Dhruv Dhody]]] Agree, updated. >>=20 >> 4) Also related to the previous point >> sec 8.2 "An implementation SHOULD allow the operator to configure the >> PCEPS >> capability and various TLS related parameters, ..." >> Probably this part of sentence should not be normative given this = part is >> (differently) specified in the previous section. >>=20 > [[[Dhruv Dhody]]] Ack, updated. >=20 > Thanks Again!=20 >=20 > The working copy and diff (handling gen-ART and your comments) are = attached.=20 >=20 > Regards, > Dhruv >>=20 >> _______________________________________________ >> Pce mailing list >> Pce@ietf.org >> https://www.ietf.org/mailman/listinfo/pce > From nobody Mon Jul 31 10:49:53 2017 Return-Path: X-Original-To: pce@ietf.org Delivered-To: pce@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9CAA3132738; Mon, 31 Jul 2017 10:49:21 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: pce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.58.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150152336114.6401.8785691395537055808@ietfa.amsl.com> Date: Mon, 31 Jul 2017 10:49:21 -0700 Archived-At: Subject: [Pce] I-D Action: draft-ietf-pce-pceps-15.txt X-BeenThere: pce@ietf.org X-Mailman-Version: 2.1.22 List-Id: Path Computation Element List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Jul 2017 17:49:22 -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 WG 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-15.txt Pages : 23 Date : 2017-07-31 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. This document updates RFC 5440 regarding the PCEP initialization phase specification. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-pce-pceps/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-pce-pceps-15 https://datatracker.ietf.org/doc/html/draft-ietf-pce-pceps-15 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-pceps-15 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/