Re: [Lsr] AD Review of draft-ietf-lsr-isis-srv6-extensions-11

"Acee Lindem (acee)" <acee@cisco.com> Fri, 12 March 2021 14:38 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Alvaro Retana <aretana.ietf@gmail.com>
CC: Christian Hopps <chopps@chopps.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, John Scudder <jgs@juniper.net>, "draft-ietf-lsr-isis-srv6-extensions@ietf.org" <draft-ietf-lsr-isis-srv6-extensions@ietf.org>
Thread-Topic: AD Review of draft-ietf-lsr-isis-srv6-extensions-11
Thread-Index: AQHXDGwJ6u24+5pL0kComv98fJf0R6p+rtKAgAGQbICAADtzgIAAAjgA//+xGIA=
Date: Fri, 12 Mar 2021 14:38:16 +0000
Message-ID: <30778D4F-BE1A-446D-ADD6-385EE17F5B32@cisco.com>
References: <CAMMESswF4GiLTRAYeLfhkC4w9tsr2J5YaMNFSG=979Bh2tmULw@mail.gmail.com> <836ca254-1273-7339-4c7d-f92d5e17315f@cisco.com> <29270_1615545597_604B44FD_29270_84_4_53C29892C857584299CBF5D05346208A4CD0E4C0@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <b639b32b-0f4c-8550-9397-b5735ebaca5a@cisco.com> <32253_1615558842_604B78BA_32253_89_12_53C29892C857584299CBF5D05346208A4CD0EB53@OPEXCAUBM43.corporate.adroot.infra.ftgroup>
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Subject: Re: [Lsr] AD Review of draft-ietf-lsr-isis-srv6-extensions-11
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Thanks for your review and comments Bruno and Peter for quick resolution. 
Acee

On 3/12/21, 9:20 AM, "bruno.decraene@orange.com" <bruno.decraene@orange.com> wrote:

    Hi Peter,

    > From: Peter Psenak [mailto:ppsenak@cisco.com]
    > Sent: Friday, March 12, 2021 3:13 PM
    > 
    > Hi Bruno,
    > 
    > please see inline:
    > 
    > On 12/03/2021 11:39, bruno.decraene@orange.com wrote:
    > > Peter, Alvaro
    > >
    > >> From: Peter Psenak [mailto:ppsenak@cisco.com]
    > >> Sent: Thursday, March 11, 2021 11:47 AM
    > >
    > > [...]
    > >
    > >>> ...
    > >>> 221	4.3.  Maximum H.Encaps MSD Type
    > >>>
    > >>> 223	   The Maximum H.Encaps MSD Type specifies the maximum
    > number
    > >> of SIDs
    > >>> 224	   that can be included as part of the "H.Encaps" behavior as
    > defined
    > >> in
    > >>> 225	   [I-D.ietf-spring-srv6-network-programming].
    > >>>
    > >>> [nit] s/included/pushed   That is the terminology used in rfc8986.
    > >>
    > >> ##PP
    > >> fixed.
    > >>
    > >>>
    > >>>
    > >>> ...
    > >>> 229	      If the advertised value is zero or no value is advertised
    > >>> 230	      then the router can apply H.Encaps only by encapsulating
    > >>> 231	      the incoming packet in another IPv6 header without SRH
    > >>> 232	      the same way IPinIP encapsulation is performed.
    > >>>
    > >>> 234	      If the advertised value is non-zero then the router
    > supports both
    > >>> 235	      IPinIP and SRH encapsulation subject to the SID limitation
    > >>> 236	      specified by the advertised value.
    > >>>
    > >>> [major] rfc8986 doesn't talk about IPinIP encapsulation, but is does say
    > this:
    > >>>
    > >>>      The push of the SRH MAY be omitted when the SRv6 Policy only
    > contains
    > >>>      one segment and there is no need to use any flag, tag or TLV.
    > >>>
    > >>> Suggestion (to replace the last two paragraphs)>
    > >>>       If the advertised value is zero or no value is advertised then the
    > >>>       headend can apply an SR Policy that only contains one segment, by
    > >>>       omitting the SRH push.
    > >>>
    > >>>       A non-zero SRH Max H.encaps MSD indicates that the headend can
    > push
    > >>>       an SRH up to the advertised value.
    > >>
    > >> ##PP
    > >> done, but used "insert" instead of "push".
    > >
    > > In SRv6, "Insert" has been used with a different meaning (SRH insertion
    > without IP encapsulation) and hence is very connoted. So I would prefer if
    > we could avoid the term "insert", to avoid both misunderstanding and
    > ambiguities.
    > >
    > > I'm not sure how many/which  :s/push/insert  you are referring to as I'm
    > seen 3  "push". I'll assume you meant the 3 of them. I would suggest the
    > following change, but any other formulation would probably work for me.
    > >
    > > OLD: The push of the SRH MAY be omitted
    > > NEW: The SRH MAY be omitted
    > >
    > > OLD: by omitting the SRH push.
    > > NEW by omitting the SRH.
    > >
    > > OLD: the headend can push an SRH up to the advertised value.
    > > NEW: the headend can perform IP encapsulation with an SRH containing up
    > to MSD SIDs.
    > > (or may be: up to this number of SIDs)
    > 
    > not sure which document/version do you look at, but I don't see any
    > occurrence of "push" or "insert" in the latest published version (11).

    I'm referring to the email (above) that you sent yesterday on the LSR mailing list in which you said " ##PP done, but used "insert" instead of "push"."
    It's not reflected in the latest published version which date from October 8, 2020

     > The single "push" I added as a response to Alvaro's comment was at:
    > 
    > 
    > The Maximum H.Encaps MSD Type signals the maximum number of SIDs
    > that can be pushed as part of the "H.Encaps" behavior as defined in
    > [RFC8986]"
    > 
    > Please let me know how do you prefer that to be modified.
    > 
    > 
    > >
    > >
    > > [...]
    > >
    > >
    > >> 245	      SRH Max End D Type: 45
    > >>
    > >> 247	      If the advertised value is zero or no value is advertised
    > >> 248	      then it is assumed that the router cannot apply
    > >> 249	      "End.DX6" or "End.DT6" behaviors if the outer IPv6 header
    > >> 250	      contains an SRH.
    > >
    > > Since I've started, I'll continue to nick pick.
    > >
    > > "assume" does not seem like the right term when talking about an explicit
    > signalling.
    > > I would suggest
    > > OLD: then it is assumed that the router cannot apply
    > > NEW: then the router cannot apply
    > 
    > fixed them all.

    Thanks,
    --Bruno


    > Peter
    > >
    > >
    > > *3 (in §4.1, §4.2, §4.4)
    > >
    > >
    > > Thank you,
    > > --Bruno
    > >
    > >
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