Re: [Idr] Important updates to draft-ietf-idr-te-lsp-distribution for WG review

Hi Cheng,

The SR Bidirectional Group Constraint sub-TLV is simply providing the
grouping constraint (if used) for setting up the bidirectional path. Note
that there are different (and existing mechanisms) to signal and set up
bidirectional paths. Note that BGP-LS is used to report SR Policies setup
by any mechanism - PCEP, Static/CLI/YANG, BGP SR Policy.

This is complementary to what is in the path segment IDR drafts where the
provisioning of the forward and reverse paths is done by a controller.

Thanks,
Ketan

On Fri, Aug 26, 2022 at 9:13 AM Chengli (Cheng Li) <c.l@huawei.com> wrote:

> Hi Ketan,
>
>
>
> I see a new SR Bidirectional Group Constraint Sub-TLV is added into the
> draft.
>
>
>
> We have another draft defining a Reverse Segment List Sub-TLV to specify the reserve SID list of a SID list.
>
>
>
> What is the relation between this two sub-TLVs? How to handle them if both appear?
>
>  Thanks,
> Cheng
>
>
>
>
> https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-sr-policy-path-segment-03#section-3.2
>
>
>
>
>
>
>
> *From:* Idr [mailto:idr-bounces@ietf.org] *On Behalf Of *Ketan Talaulikar
> *Sent:* Monday, August 22, 2022 3:26 PM
> *To:* idr@ietf. org <idr@ietf.org>
> *Subject:* [Idr] Important updates to draft-ietf-idr-te-lsp-distribution
> for WG review
>
>
>
> Hello All,
>
>
>
> We (authors) have posted some important proposed updates to the draft for
> WG review and feedback.
>
>
>
> The major changes proposed are as follows:
>
> a) Separation of NLRI types for the various TE Policies for better clarity
> and proper handling in implementations.
>
> b) "IP-based tunnels" were included as TE Policies in the introduction but
> there was nothing further about them in the rest of the document. Reference
> to them is being removed.
>
> c) Clarifications on the use of various descriptors for respective NLRI
> types and the use of appropriate Protocol-IDs for them.
>
> d) Updates for some of the status information flags for SR Policies.
>
> e) Addition of two new constraints sub-TLVs for SR Policy CPs.
>
> f) Clarification of the metric types and their reporting (including two
> new metric types)
>
>
>
> There are also a few other editorial changes and fixes.
>
>
>
> These changes are based on feedback and inputs from ongoing
> implementations. As the authors are aware of multiple implementations (in
> progress at various stages), we request the WG to review and provide your
> feedback/inputs.
>
>
>
> Thanks,
>
> Ketan (on behalf of co-authors)
>
>
>
> On Mon, Aug 22, 2022 at 12:51 PM <internet-drafts@ietf.org> wrote:
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Inter-Domain Routing WG of the IETF.
>
>         Title           : Distribution of Traffic Engineering (TE)
> Policies and State using BGP-LS
>         Authors         : Stefano Previdi
>                           Ketan Talaulikar
>                           Jie Dong
>                           Mach(Guoyi) Chen
>                           Hannes Gredler
>                           Jeff Tantsura
>   Filename        : draft-ietf-idr-te-lsp-distribution-18.txt
>   Pages           : 57
>   Date            : 2022-08-22
>
> Abstract:
>    This document describes a mechanism to collect the Traffic
>    Engineering Policy information that is locally available in a node
>    and advertise it into BGP Link State (BGP-LS) updates.  Such
>    information can be used by external components for path computation,
>    re-optimization, service placement, network visualization, etc.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-idr-te-lsp-distribution/
>
> There is also an htmlized version available at:
> https://datatracker.ietf.org/doc/html/draft-ietf-idr-te-lsp-distribution-18
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-te-lsp-distribution-18
>
>
> Internet-Drafts are also available by rsync at rsync.ietf.org:
> :internet-drafts
>
>
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