Re: [mpls] Alvaro Retana's Discuss on draft-ietf-mpls-sr-over-ip-03: (with DISCUSS and COMMENT)

"Adrian Farrel" <adrian@olddog.co.uk> Thu, 23 May 2019 16:15 UTC

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Reply-To: adrian@olddog.co.uk
From: Adrian Farrel <adrian@olddog.co.uk>
To: 'Alvaro Retana' <aretana.ietf@gmail.com>, 'The IESG' <iesg@ietf.org>
Cc: mpls-chairs@ietf.org, 'Loa Andersson' <loa@pi.nu>, draft-ietf-mpls-sr-over-ip@ietf.org, mpls@ietf.org
References: <155252870218.24914.13341927320393340552.idtracker@ietfa.amsl.com> <070801d501db$24c08500$6e418f00$@olddog.co.uk> <CAMMESsyGTG4=HtmwCr_01rD9P=LXRi6qB4UAX1KQq6_UOAeb+w@mail.gmail.com>
In-Reply-To: <CAMMESsyGTG4=HtmwCr_01rD9P=LXRi6qB4UAX1KQq6_UOAeb+w@mail.gmail.com>
Date: Thu, 23 May 2019 17:15:26 +0100
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Subject: Re: [mpls] Alvaro Retana's Discuss on draft-ietf-mpls-sr-over-ip-03: (with DISCUSS and COMMENT)
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Hi,

 

Thanks for this.

 

Looks simple, and -06 will be along shortly to change…

> Just one detail (non-blocking): the third step (§3.1) says "If A
> and E are in different IGP domains…”. Strictly speaking, specially
> because we could be dealing with BGP, that should be “different
> routing domains” — while most of the time different autonomous
> systems, even under the same administration, will use different
> IGP domains, that is not always the case.  Generalizing to 
> “routing domains” sounds better to me.

Yup.

> The text changed from (in -03): 
>
> "The tunnel selected MUST have its remote end point (destination)
> address equal to the address of the next SR-MPLS capable node
> along the path (i.e., the egress of the active node segment).”
>
> …to:
> "The tunnel selected MUST have its remote end point (destination)
> address equal to the address of the next SR-MPLS capable node
> identified as being on the SR path (i.e., the egress of the active
> node segment).”
:
:
> My problem is not with the text you changed, but with the clarification:
> "the egress of the active node segment”.  Specifically, I think that the
> characterization as a *node segment* is wrong.
:
:
> As I suggested before, taking out the clarifying phrase will satisfy my
> point.  Also will s/the egress of the active node segment/the egress of
> the active segment

I apologise!

Sometimes you can’t see your own errors unless you have your nose rubbed in them while being slapped about the head with a wet lettuce ☹

Yes, “active node segment” is wrong and “active segment” is very fine.

Thanks for all the work to get this document right.

Best,

Adrian