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Philip -

I appreciate your vigilance/persistence (really - I do!!).

If we (ISIS-WG)  try to pursue your suggestion it means that the WG has to discuss - in addition to the merits/demerits/use cases defined in draft-ietf-isis-encapsulation-cap-01.txt - the merits/demerits/use cases defined in Annex B of ITU-T G.7712 (and previously in your old draft https://www.ietf.org/archive/id/draft-ietf-isis-auto-encap-03.txt ).

I am not sure it is wise to try to legitimize the ITU usage in this way. But, if you want to pursue this I think you should put the question squarely to the WG, chairs, AD. I don't think either of us wants to be surreptitious about this.

   Les

> -----Original Message-----
> From: Isis-wg [mailto:isis-wg-bounces@ietf.org] On Behalf Of Philip Christian
> Sent: Tuesday, April 25, 2017 12:50 AM
> To: isis-wg@ietf.org
> Subject: Re: [Isis-wg] I-D Action: draft-ietf-isis-encapsulation-cap-01.txt
> 
> There is already an existing standard for encapsulation capability TLV in IS-IS.
> 
> Please see Annex B of ITU-T G.7712 here:-
> https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-G.7712-201009-
> I!!PDF-E&type=items
> 
> In summary it already defines a tunnelling capability TLV 16.
> Within TLV 16 it defines subTLV 1 with the sets of 47,NLPID,NLPID for GRE
> unencapsulation capabilities.
> 
> Surely it would be better to re-use this and use 1-46 for encapsulation
> techniques other than GRE.
> 
> regards, Philip Christian
> 
> 
> 
> On 25/04/2017 04:13, 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 IS-IS for IP Internets of the IETF.
> >
> >         Title           : Advertising Tunnelling Capability in IS-IS
> >         Authors         : Xiaohu Xu
> >                           Bruno Decraene
> >                           Robert Raszuk
> >                           Uma Chunduri
> >                           Luis M. Contreras
> >                           Luay Jalil
> > 	Filename        : draft-ietf-isis-encapsulation-cap-01.txt
> > 	Pages           : 11
> > 	Date            : 2017-04-24
> >
> > Abstract:
> >    Some networks use tunnels for a variety of reasons.  A large variety
> >    of tunnel types are defined and the ingress needs to select a type of
> >    tunnel which is supported by the egress.  This document defines how
> >    to advertise egress tunnel capabilities in IS-IS Router Capability
> >    TLV.
> >
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-isis-encapsulation-cap/
> >
> > There are also htmlized versions available at:
> > https://tools.ietf.org/html/draft-ietf-isis-encapsulation-cap-01
> > https://datatracker.ietf.org/doc/html/draft-ietf-isis-encapsulation-ca
> > p-01
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-encapsulation-cap-01
> >
> >
> > 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/
> >
> > _______________________________________________
> > Isis-wg mailing list
> > Isis-wg@ietf.org
> > https://www.ietf.org/mailman/listinfo/isis-wg
> >
> 
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