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Re: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-10.txt

"Acee Lindem (acee)" <acee@cisco.com> Thu, 24 September 2020 21:25 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Joel Halpern <jmh@joelhalpern.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-10.txt
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Date: Thu, 24 Sep 2020 21:25:38 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/HnRU5pShqa_SED77ojtgC_IR7ug>
Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-10.txt
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H Joel, 

Can you reference the specific section in the IS-IS SRv6 draft you are commenting on? I seem to remember this discussion but it was at least a month back, if not more. 

Thanks,
Acee

On 9/23/20, 6:31 PM, "Lsr on behalf of Joel Halpern" <lsr-bounces@ietf.org on behalf of jmh@joelhalpern.com> wrote:

    The announcement prompted me to look again and think about an 
    interaction between this and the network programming draft.  To be 
    clear, I am NOT objecting to either this or the network programming 
    draft.  I am just wondering what I am missing.

    The NP draft, and the advertisement mechanism allows a router to 
    advertise the number of bits for the ARG portion of a SID.

    Q1: The point presumably is to avoid needing to advertise each of the 
    individual values?

    An example of this is, I think, and ARG for the table selection where 
    the ARG is the table number for the packet to be looked up in?

    Q2: If so, how does the head end know what table number corresponds to 
    what meaning?    If this requires a separate advertisement there seems 
    to be no savings.  if this requires out-of-band knowledge then we seem 
    to have lost the benefit of advertising all of this in the routing protocol.

    I suspect I am simply missing a piece.  can someone explain please?

    Thank you,
    Joel

    On 9/23/2020 4:40 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 Link State Routing WG of the IETF.
    > 
    >          Title           : IS-IS Extension to Support Segment Routing over IPv6 Dataplane
    >          Authors         : Peter Psenak
    >                            Clarence Filsfils
    >                            Ahmed Bashandy
    >                            Bruno Decraene
    >                            Zhibo Hu
    > 	Filename        : draft-ietf-lsr-isis-srv6-extensions-10.txt
    > 	Pages           : 25
    > 	Date            : 2020-09-23
    > 
    > Abstract:
    >     Segment Routing (SR) allows for a flexible definition of end-to-end
    >     paths by encoding paths as sequences of topological sub-paths, called
    >     "segments".  Segment routing architecture can be implemented over an
    >     MPLS data plane as well as an IPv6 data plane.  This draft describes
    >     the IS-IS extensions required to support Segment Routing over an IPv6
    >     data plane.
    > 
    > 

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