Re: [lisp] I-D Action: draft-ietf-lisp-pubsub-05.txt

mohamed.boucadair@orange.com Fri, 20 March 2020 09:50 UTC

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From: mohamed.boucadair@orange.com
To: Joel Halpern <jmh@joelhalpern.com>, "lisp@ietf.org" <lisp@ietf.org>
Thread-Topic: [lisp] I-D Action: draft-ietf-lisp-pubsub-05.txt
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Date: Fri, 20 Mar 2020 09:50:27 +0000
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Subject: Re: [lisp] I-D Action: draft-ietf-lisp-pubsub-05.txt
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Hi Joel,

Good catch.

I think we just need to delete that second sentence. The behavior when pubsub is not supported is covered by this text: 

   Upon receipt of the Map-Request, the Map-Server processes it as
   described in [I-D.ietf-lisp-rfc6833bis].

The failure cases we wanted to cover are those in:

   The subscription of an xTR-ID to the list of subscribers for the EID-
   Record may fail for a number of reasons.  For example, because of
   local configuration policies (such as accept and drop lists of
   subscribers), or because the Map-Server has exhausted the resources
   to dedicate to the subscription of that EID-Record (e.g., the number
   of subscribers excess the capacity of the Map-Server).

Cheers,
Med

> -----Message d'origine-----
> De : lisp [mailto:lisp-bounces@ietf.org] De la part de Joel Halpern
> Envoyé : jeudi 19 mars 2020 17:25
> À : lisp@ietf.org
> Objet : Re: [lisp] I-D Action: draft-ietf-lisp-pubsub-05.txt
> 
> I was reading this draft again to think about the questions Alberto
> raised on the list.  In doing so, I came across something that I think
> needs to be clarified.
> 
> In section 5, I see the following two sentences:
>   If the subscription fails, the Map-Server MUST send a Map-Reply to
>   the originator of the Map-Request, as described in
>   [I-D.ietf-lisp-rfc6833bis].  This is also the case when the Map-
>   Server does not support PubSub operation.
> 
> I understand the first sentence.  The second sentence appears to cover
> two different cases.  One case is where the Map-Server understands
> PubSub, but does not accept it.  Okay.  I can see an error in that
> case.
>   But, as written, this seems to be intended to apply to a Map-Server
> that has never heard of the PubSub extension.  Such a Map-Server will
> ignore the I bit and ignore the N bit.  It will not know that this is
> a
> PubSub request, and as such will not generate an error.  I have no
> problem with generating an error in the known but not supported case.
> Can we (when we revise the draft) clarify the text?
> (It took me a little bit to realize that this text probably meant the
> known but not supported case, as it was the unknown case that came to
> mind first.)
> 
> Yours,
> Joel
> 
> On 3/18/2020 8:50 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 Locator/ID Separation Protocol WG
> of the IETF.
> >
> >          Title           : Publish/Subscribe Functionality for LISP
> >          Authors         : Alberto Rodriguez-Natal
> >                            Vina Ermagan
> >                            Johnson Leong
> >                            Fabio Maino
> >                            Albert Cabellos-Aparicio
> >                            Sharon Barkai
> >                            Dino Farinacci
> >                            Mohamed Boucadair
> >                            Christian Jacquenet
> >                            Stefano Secci
> > 	Filename        : draft-ietf-lisp-pubsub-05.txt
> > 	Pages           : 12
> > 	Date            : 2020-03-18
> >
> > Abstract:
> >     This document specifies an extension to the use of Map-Request
> to
> >     enable Publish/Subscribe (PubSub) operation for LISP.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-lisp-pubsub/
> >
> > There are also htmlized versions available at:
> > https://tools.ietf.org/html/draft-ietf-lisp-pubsub-05
> > https://datatracker.ietf.org/doc/html/draft-ietf-lisp-pubsub-05
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-lisp-pubsub-05
> >
> >
> > 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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> >
> 
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