Re: [Pce] WG Last Call for draft-ietf-pce-binding-label-sid-07 (and Code Point Allocation)

Siva Sivabalan <msiva282@gmail.com> Sun, 28 March 2021 23:34 UTC

Return-Path: <msiva282@gmail.com>
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 8F5DE3A29B5; Sun, 28 Mar 2021 16:34:02 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.837
X-Spam-Level:
X-Spam-Status: No, score=-1.837 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, 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 h9BHb_Q7zraf; Sun, 28 Mar 2021 16:33:57 -0700 (PDT)
Received: from mail-oi1-x22b.google.com (mail-oi1-x22b.google.com [IPv6:2607:f8b0:4864:20::22b]) (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 EEDF43A29BA; Sun, 28 Mar 2021 16:33:49 -0700 (PDT)
Received: by mail-oi1-x22b.google.com with SMTP id c16so11528638oib.3; Sun, 28 Mar 2021 16:33:49 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=u/bcAq+ePDScAgXQUrwI2XvWhn2XEOQDMbhOKRPcBOE=; b=bDxlKk+tuDAaSpy48H/thhYwnaxASncD3Sl3nQZtuLszCgHZpMS02zNJAITTj/g8/4 jPtsHDnBqOST5K/I6cRwYaOxGQi7TKLV/RI6WedqAGzEJImiAJfiRF/3cV29fygMep7a 0dhSY/1flZhoptR7j3kNx5IUag3zDfmacN6YRywMpcfbbfru1y2gEL7MfK7kmI9RC/6A oMIEBffPjuBiHxRETEz2eQSch+tS2e7F09tSZ1vqmRGTzzoArnT45tsmMRJJtTjGUXWA nK8tcse2SqlV8l0/TuKCSP/rKpB2wflna7C3GOY+XT1InkGAha/oqmXNo14PLP8tdudB asNQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=u/bcAq+ePDScAgXQUrwI2XvWhn2XEOQDMbhOKRPcBOE=; b=CQw4Cx04ShSScicBtdbh7zbTuT30Q0U9nUzlWCV3DejQN+nALa/KnN6SiGg9S+K7Vk XgvXsaNmUdLUpXmS/5d84L+yXyhG04E8bO9iQpWV0Zec5iukBT2smzFMckVV8AGmYEWV Csi2GefvT2V3pV7jVKqVrXtA7ORPbpQFzIuZ5gf51ruN7LFxrzJ7eyEUfjzfhUp0jfHy 2tgVTdtFDIF/vrdTrYl0XbhtmkstcOrZHSmT+PdZ+rFca0wNftUYTElAaSq58ljK8z3o Nj/osj3o8ExKqQ5Ys0JWmLx7khq+83z7U2CraBuKfLi7YbxRSxiLusW9EPhhSMZiaeOl d1XA==
X-Gm-Message-State: AOAM532qqI/j1MyqV/yw38QU3WKFaF4CB2f6AucGLVS489nsiXa17akr 7rKNcm+eY8gvzVlU4p5233p6Y7+9SMNqvsnh+QA=
X-Google-Smtp-Source: ABdhPJwyTnBtq9wEebXZaR0jKgP0z7hOumuEDPZ4aClW7DVLfVYfrkwhD8uRbOX+cSoTBHTPakkM/YypIfdWgg697z4=
X-Received: by 2002:aca:57d0:: with SMTP id l199mr17677188oib.115.1616974428874; Sun, 28 Mar 2021 16:33:48 -0700 (PDT)
MIME-Version: 1.0
References: <7010_1616065722_605334BA_7010_19_1_3f1d8d24-af98-f962-95ea-0e6ec46b738c@orange.com> <375C800D-2014-4D14-830E-0D15439B9F20@nokia.com> <a2f9686490a34a39af5f977cf59230b7@huawei.com> <B3B06655-1F99-416A-AF8F-9FA53E6DB0BB@nokia.com> <be741e7913304da8a3afd9b1f3cbd1fb@huawei.com> <CABNhwV044vY4tQP6OJhwDWAkMYnD+i=OVKURb1y8eJeMLSHL_A@mail.gmail.com> <CANJFx2T8ZBucUDM+D5UrJ-eF_EKA3Y-Qd2R-6ksX5U_vDJJzhw@mail.gmail.com> <CABNhwV2anNySChRZ_SyE4Fx6+0CeU=R+ZzLPDM3BDhspkOUZMw@mail.gmail.com>
In-Reply-To: <CABNhwV2anNySChRZ_SyE4Fx6+0CeU=R+ZzLPDM3BDhspkOUZMw@mail.gmail.com>
From: Siva Sivabalan <msiva282@gmail.com>
Date: Sun, 28 Mar 2021 19:33:38 -0400
Message-ID: <CANJFx2TPPP6ffisALzgkHh6q_x9CpxyxZbf+qiPx62dCbd_RrA@mail.gmail.com>
To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: "Chengli (Cheng Li)" <c.l@huawei.com>, "Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com>, "draft-ietf-pce-binding-label-sid@ietf.org" <draft-ietf-pce-binding-label-sid@ietf.org>, "julien.meuric@orange.com" <julien.meuric@orange.com>, "pce@ietf.org" <pce@ietf.org>
Content-Type: multipart/alternative; boundary="00000000000071aba405bea13220"
Archived-At: <https://mailarchive.ietf.org/arch/msg/pce/RzRkXBWoHhNcsgA8mg8XjvZbCTo>
Subject: Re: [Pce] WG Last Call for draft-ietf-pce-binding-label-sid-07 (and Code Point Allocation)
X-BeenThere: pce@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Path Computation Element <pce.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/pce>, <mailto:pce-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/pce/>
List-Post: <mailto:pce@ietf.org>
List-Help: <mailto:pce-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/pce>, <mailto:pce-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 28 Mar 2021 23:34:03 -0000

Hi Gyan,

This ID is all about signaling BSID for RSVP-TE tunnels and SR policies via
PCEP.

Please do not confuse signaling aspects with how BSID is used.

There is no change required in the ID.

Thanks,
Siva


On Sun, Mar 28, 2021 at 7:25 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

>
> All
>
> After further review with Siva the use case is for connecting SR islands
> over RSVP-TE core.
>
> So this is for stitching SR-TE on the edge islands binding SID to core
> RSVP-TE tunnel.
>
> One major gap  of RSVP-TE is the VRF / VPN coloring capability that in
> order to achieve per VRF coloring mapping of VRF to a discrete TE tunnel
> requires a separate loopback and static routes to egress PE so it does not
> scale.  So for as many RSVP mapped tunnels that exist you need that many
> loopbacks and static routes for the next hop rewrite to the RSVP tunnel
> next hop.
>
> So this Major gap is filled with SR VRF and app flow coloring capability
> that with SR-TE Policy BSID bound to candidate path can provide the
> scalability per VRF coloring.
>
> So at the edges you may have many 100s of colored RSVP tunnels but as the
> core does not scale you can not provide a 1-1 mapping of SR-TE tunnel to
> RSVP tunnel.  So you would have many to 1 mappings of SR-TE tunnels to
> single or aggregate.
>
> So in my mind to only way the BSID would come into play is if you could do
> a 1-1 mapping of SR-TE tunnel to RSVP tunnel.  Technically that is not
> possible.
>
> For PCE to compute end to end path in this scenario does RSVP-TE require
> the BSID for the stitching even if a many SR-TE colors to single RSVP-TE
> tunnel mapping. I would not think so.
>
> If we think that for PCE to build the end to end path even for the end to
> end path in this scenario requires BSID binding to the RSVP-TE single path
> to make contiguous end to end then I agree technically we do need to make
> this inclusive of RSVP-TE.
>
> I think we need to clear this up and if this use case is really not
> feasible then we should remove any mention of BSID use with RSVP-TE tunnel.
>
> Kind Regards
>
> Gyan
>
> On Sat, Mar 27, 2021 at 3:05 PM Siva Sivabalan <msiva282@gmail.com> wrote:
>
>> Hi Gyan,
>>
>> BSID can be allocated for RSVP-TE as well, and yes, there are use-cases
>> for that. The proposed PCEP extension is equally applicable to both SR-TE
>> and RSVP-TE.
>>
>> Thanks,
>> Siva
>>
>> On Sat, Mar 27, 2021 at 1:40 PM Gyan Mishra <hayabusagsm@gmail.com>
>> wrote:
>>
>>>
>>>
>>> I support WG LC advancement of this draft for publication.
>>>
>>> I see there are a lot of comments related to a mix of verbiage related
>>> to MPLS label binding and Binding label SID confusion.
>>>
>>> Few comments.
>>>
>>> The draft title states “carrying binding label/sid in PCE based networks”
>>>
>>> In the abstract it states it is possible to associate a BSID with a RSVP
>>> signaled path.
>>>
>>> I don’t recall any RSVP extension to support concept of BSID usage on an
>>> active Candidate Path option ERO.  Can you refer me to the RFC that states
>>> how BSID is used with RSVP TE.
>>>
>>> For more clarity with this draft can we replace
>>>
>>> s/TE/s/SR as TE nomenclature refers to RSVP-TE and does add confusion
>>> where SR is SR.  When mentioned traffic engineered path please spell out or
>>> say SR path for clarity.
>>>
>>> Also the “TE-PATH-BINDING TLV” can we change to “SR-PATH-BINDING TLV”.
>>>
>>> The word “binding” is very confusing as it’s used interchangeably with
>>> label binding and binding SID.
>>>
>>> So I am thinking a more appropriate name for the TLV would be
>>> “SR-TE-BSID TLV”.  Makes it clear and concise the TLV is for SR-TE.
>>>
>>> Kind Regards
>>>
>>> Gyan
>>>
>>> On Fri, Mar 26, 2021 at 9:45 PM Chengli (Cheng Li) <c.l@huawei.com>
>>> wrote:
>>>
>>>> Thanks again for your help!
>>>>
>>>> Cheng
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: Stone, Andrew (Nokia - CA/Ottawa) [mailto:andrew.stone@nokia.com]
>>>>
>>>> Sent: Saturday, March 27, 2021 2:42 AM
>>>> To: Chengli (Cheng Li) <c.l@huawei.com>om>; julien.meuric@orange.com;
>>>> pce@ietf.org
>>>> Cc: draft-ietf-pce-binding-label-sid@ietf.org
>>>> Subject: Re: [Pce] WG Last Call for draft-ietf-pce-binding-label-sid-07
>>>> (and Code Point Allocation)
>>>>
>>>> Hi Cheng,
>>>>
>>>> Thanks for clarifying the text in the document. Diff content looks good
>>>> to me, much clearer. Consider my comments resolved.
>>>>
>>>> Thanks!
>>>> Andrew
>>>>
>>>> On 2021-03-25, 10:49 PM, "Pce on behalf of Chengli (Cheng Li)" <
>>>> pce-bounces@ietf.org on behalf of c.l@huawei.com> wrote:
>>>>
>>>>     Hi Andrew,
>>>>
>>>>     Thanks for your comments, please see my reply inline.
>>>>
>>>>     Also, the diff is attached.
>>>>
>>>>     Respect,
>>>>     Cheng
>>>>
>>>>
>>>>
>>>>
>>>>     -----Original Message-----
>>>>     From: Stone, Andrew (Nokia - CA/Ottawa) [mailto:
>>>> andrew.stone@nokia.com]
>>>>     Sent: Saturday, March 20, 2021 4:21 AM
>>>>     To: julien.meuric@orange.com; pce@ietf.org
>>>>     Cc: draft-ietf-pce-binding-label-sid@ietf.org
>>>>     Subject: Re: [Pce] WG Last Call for
>>>> draft-ietf-pce-binding-label-sid-07 (and Code Point Allocation)
>>>>
>>>>     Hi all,
>>>>
>>>>     Overall Support WGLC. It's an important document in the world of
>>>> SRTE, and the document goes to good lengths to describe the various
>>>> scenarios and combinations.
>>>>
>>>>     Only one question I have for the authors and WG, for any further
>>>> clarification on the following text (section 4):
>>>>
>>>>
>>>>       The absence of TE-PATH-BINDING TLV in PCUpd message
>>>>        means that the PCE does not specify a binding value in which
>>>> case the
>>>>        binding value allocation is governed by the PCC's local policy.
>>>>
>>>>
>>>>     I find the "governed by PCC local policy" a bit too vague and could
>>>> lead to implementation interop differences. Assuming a PCInitiated LSP that
>>>> been established with a BSID: If the PCE wants to withdraw the binding SID
>>>> , I interpret the document as the PCE would send a PCUpdate without the
>>>> TLV, but the behaviour is now up to PCC as per that text. if the PCC local
>>>> policy/implementation is to do nothing, how can the PCE explicitly
>>>> force-remove the BSID with a PCUpdate? In a similar manner, If the PCE does
>>>> not want to change the value but PCC local policy is to treat missing TLV
>>>> as remove, then PCE should always send the TLV in every PCUpdate (which I'm
>>>> okay with) which is not stated, otherwise the local policy/implementation
>>>> may interpret it as a removal compared to an implementation which may
>>>> interpret it as being okay to not send the TLV on every PCUpdate since
>>>> there was "no change".
>>>>
>>>>     In summary: might need a bit of a wording to further detail "PCE
>>>> wishes to withdraw" case.
>>>>
>>>>     [Cheng] You are correct, there was some issues with multiple
>>>> TE-PATH-BINDING TLV. This has been updated. See the diff.
>>>>
>>>>     The above text has been updated to -
>>>>
>>>>        The absence of TE-PATH-BINDING TLV in PCUpd message means that
>>>> the
>>>>        PCE does not specify a binding value in which case any previous
>>>>        allocated binding values are withdraw.
>>>>
>>>>     Further, the PCC's local policy aspect has been seperated out as -
>>>>
>>>>        In the absence of any instruction from the PCE, the PCC's local
>>>>        policy dictates how the binding allocations are made for a given
>>>> LSP.
>>>>
>>>>     Thanks!
>>>>
>>>>
>>>>     Thanks!
>>>>     Andrew
>>>>
>>>>     On 2021-03-18, 7:09 AM, "Pce on behalf of julien.meuric@orange.com"
>>>> <pce-bounces@ietf.org on behalf of julien.meuric@orange.com> wrote:
>>>>
>>>>         Hi all,
>>>>
>>>>         This message initiates a 2-week PCE WG Last Call for
>>>>         draft-ietf-pce-binding-label-sid-07. Please review and share
>>>> your
>>>>         feedback, whatever it is, using the PCE mailing list. This WGLC
>>>> will end
>>>>         on Thursday April 1st (no kidding).
>>>>
>>>>
>>>>         Moreover, we have received a request from the authors for a
>>>> code point
>>>>         allocation to support interoperability testing.
>>>>
>>>>         RFC 7120 requires to meet the following criteria to proceed:
>>>>
>>>>         b. The format, semantics, processing, and other rules related to
>>>>         handling the protocol entities defined by the code points
>>>>         (henceforth called "specifications") must be adequately
>>>> described
>>>>         in an Internet-Draft.
>>>>         c. The specifications of these code points must be stable;
>>>> i.e., if
>>>>         there is a change, implementations based on the earlier and
>>>> later
>>>>         specifications must be seamlessly interoperable.
>>>>
>>>>         If anyone believes that the draft does not meet these criteria,
>>>> or
>>>>         believes that early allocation is not appropriate for any other
>>>>         reason, please send an email to the PCE mailing list explaining
>>>> why. If
>>>>         the chairs hear no objections by Thursday, March 25th, we will
>>>> kick off
>>>>         the "early" allocation request.
>>>>
>>>>         Thanks,
>>>>
>>>>         Dhruv & Julien
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________________________________________________________
>>>>
>>>>         Ce message et ses pieces jointes peuvent contenir des
>>>> informations confidentielles ou privilegiees et ne doivent donc
>>>>         pas etre diffuses, exploites ou copies sans autorisation. Si
>>>> vous avez recu ce message par erreur, veuillez le signaler
>>>>         a l'expediteur et le detruire ainsi que les pieces jointes. Les
>>>> messages electroniques etant susceptibles d'alteration,
>>>>         Orange decline toute responsabilite si ce message a ete altere,
>>>> deforme ou falsifie. Merci.
>>>>
>>>>         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
>>>>
>>>>
>>>> _______________________________________________
>>>> Pce mailing list
>>>> Pce@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/pce
>>>>
>>> --
>>>
>>> <http://www.verizon.com/>
>>>
>>> *Gyan Mishra*
>>>
>>> *Network Solutions A**rchitect *
>>>
>>> *Email gyan.s.mishra@verizon.com <gyan.s.mishra@verizon.com>*
>>>
>>>
>>>
>>> *M 301 502-1347*
>>>
>>> --
>
> <http://www.verizon.com/>
>
> *Gyan Mishra*
>
> *Network Solutions A**rchitect *
>
> *Email gyan.s.mishra@verizon.com <gyan.s.mishra@verizon.com>*
>
>
>
> *M 301 502-1347*
>
>