Re: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-09.txt

"Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com> Thu, 05 November 2020 19:14 UTC

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From: "Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com>
To: "Ketan Talaulikar (ketant)" <ketant=40cisco.com@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-09.txt
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Date: Thu, 5 Nov 2020 19:14:47 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/0TZTROHehQzLHhnas2YQ5q6hV5c>
Subject: Re: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-09.txt
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Hi Ketan,

Thanks for this update / referencing the yang related question I had about multiple objective/constraints (1). Regarding composite candidate path, quickly thinking about it from a controller/pce point of view, it does seem like an elegant solution to re-use the entire SR Policy construct in a nested manner to achieve combination of TE constraint/objective patterns, avoiding a lot of complexity in yang/protocol modelling at the cost of more SR Policy headend/controller state to manage/deal/work with. I think it was a good idea to have that restriction of a depth of one. No other comments or feedback yet, will let this stew a bit.

Thanks again,
Andrew


On 2020-11-01, 8:02 PM, "spring on behalf of Ketan Talaulikar (ketant)" <spring-bounces@ietf.org on behalf of ketant=40cisco.com@dmarc.ietf.org> wrote:

    Hello All,

    We have just posted an update for the draft and following is the summary of changes:

    1) Introduction of the Composite Candidate Path construct to address a pending comment from the WG (Ref : https://mailarchive.ietf.org/arch/msg/spring/fEqE5TOwdh2vEyFm_MEjiXyP2ws/ and https://mailarchive.ietf.org/arch/msg/spring/d9oSSbgp0jCExRx0SXyBY0CyqXU/)
    2) Based on offline feedback received, updated SRv6 segment types to include optional SRv6 SID and behavior instead of the new type that was introduced for it in the v08.
    3) Clarification of handling of colors and BGP multi-path scenarios based on offline feedback received.
    4) Clarification on considerations for TI-LFA for SR Policy as discussed in the WG (Ref : https://mailarchive.ietf.org/arch/msg/spring/EV1ytUsd5ZgkMHDN0IvFhw9id40/)

    Please let know your comments/feedback.

    Thanks,
    Ketan (on behalf of co-authors)

    -----Original Message-----
    From: spring <spring-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
    Sent: 02 November 2020 06:27
    To: i-d-announce@ietf.org
    Cc: spring@ietf.org
    Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-09.txt


    A New Internet-Draft is available from the on-line Internet-Drafts directories.
    This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

            Title           : Segment Routing Policy Architecture
            Authors         : Clarence Filsfils
                              Ketan Talaulikar
                              Daniel Voyer
                              Alex Bogdanov
                              Paul Mattes
    	Filename        : draft-ietf-spring-segment-routing-policy-09.txt
    	Pages           : 37
    	Date            : 2020-11-01

    Abstract:
       Segment Routing (SR) allows a headend node to steer a packet flow
       along any path.  Intermediate per-flow states are eliminated thanks
       to source routing.  The headend node steers a flow into an SR Policy.
       The header of a packet steered in an SR Policy is augmented with an
       ordered list of segments associated with that SR Policy.  This
       document details the concepts of SR Policy and steering into an SR
       Policy.


    The IETF datatracker status page for this draft is:
    https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-policy/

    There are also htmlized versions available at:
    https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-09
    https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-policy-09

    A diff from the previous version is available at:
    https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-policy-09


    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/


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