Re: [Pce] Implementation option of draft-ietf-pce-stateful-interdomain-01.txt

olivier.dugeon@orange.com Thu, 11 March 2021 10:17 UTC

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To: Dhruv Dhody <dhruv.ietf@gmail.com>
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Subject: Re: [Pce] Implementation option of draft-ietf-pce-stateful-interdomain-01.txt
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Hello Dhruv, all,

Following the presentation done during the IETF meeting, please find the link to the presentation: https://datatracker.ietf.org/meeting/110/materials/slides-110-pce-32-inter-domain-00

I also not a major point to take into account following the presentation of draft PCEP Operational Clarification (draft-koldychev-pce-operational) see https://datatracker.ietf.org/doc/draft-koldychev-pce-operational/ and https://datatracker.ietf.org/meeting/110/materials/slides-110-pce-34-operational-clarification-00:

 => In this draft, authors propose to use SR-ERO/SRv6-ERO and to NOT use SR-RRO/SR-v6-RRO for Segment Routing.

As a consequence for the stateful inter-domain draft, proposed option d1, d2 and d3 become invalid as it uses the RRO to convey the Stiching Label. Thus, only option d4 with a specific new sub-Object to convey the Stitching Label remains valid.

As usual, comments are welcome.

Regards

Olivier

Le 26/02/2021 à 05:35, Dhruv Dhody a écrit :
> Hi Olivier,
>
> Thanks for starting this thread.
>
> As a WG participant...
>
> On Tue, Feb 23, 2021 at 12:05 AM <olivier.dugeon@orange.com <mailto:olivier.dugeon@orange.com>> wrote:
>
>     Dear all,
>
>     According to the remark about implementation we got during the WG call
>     for adoption, we would start a new thread to discuss this point.
>     The goal isto prepare the discussion for next IETF meeting and reach a
>     consensusin order to edit revision 2 of the draft.
>
>     The stitching label principle requires at least a certain number of
>     modifications in the current PCEP version:
>
>      a) A new PCE Capability to announce the inter-domain behaviour
>      b) A new PCE Association Group to associate the local paths identifier
>         to the inter-domain identifier
>      c) new PCEP Errors to manage the Stitching Label exchange
>      d) A mechanism to convey the Stitching Label
>
>     If there is no other choice than to reuse existing PCEP Objects by
>     allocating new code points for modifications a-c,there is several
>     options for point d, which we have tried to list below:
>
>      d1) Use ERO and RRO in conjunction to new Path Setup code points as
>          described in version 01 of the draft. It is the simplest
>          implementation but as mention by Dhruv, each time a new path
>          enforcement appear, a new PST code point must be allocated.
>          For example, when Segment Routing v6 will be standardized, we must
>          allocate a new Stitching label PST code point for SRv6.
>      d2) Use ERO and ERO in conjunction to a new flag in LSP. Simple as for d1,
>          but need to use the LSP Extended Flag draft as all LSP flags have been
>          already allocated.
>      d3) Same as d2 but find another place for the flag e.g. SRP or LSPA Object.
>      d4) Define a new PCEP sub-Objet TLV within the LSP Object to convey the
>          stitching label. This is more independent but need extra parsing from
>          an implementation point of view.
>
>
> My preference would for d2 or d3 (in that order).
> LSP Extended Flag is adopted by the WG and is ready for prime-time use -- let's use it :)
> Authors of LSP Extended Flag are waiting for the draft blockade to be lifted to post the -00 WG I-D.
>  
> Thanks!
> Dhruv
>  
>
>     Please, give us your opinion about these different options and don't hesitate
>     to propose others.
>
>     Regards
>
>     Olivier on be-half of co-author's
>
>
>
>
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Olivier Dugeon
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