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

bruno.decraene@orange.com Fri, 12 March 2021 14:20 UTC

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From: <bruno.decraene@orange.com>
To: Peter Psenak <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
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Date: Fri, 12 Mar 2021 14:20:40 +0000
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Subject: Re: [Lsr] AD Review of draft-ietf-lsr-isis-srv6-extensions-11
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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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