Re: [Isis-wg] WG Adoption Call for draft-xu-isis-encapsulation-cap

["Les Ginsberg (ginsberg)" <[e-mail]>]

Apologies for the very late response on this...

I have a couple of concerns regarding taking on this work.

The draft is straightforward enough in terms of the protocol extensions defined, but I am not at all clear on the usefulness of the information being advertised. The introduction to the draft discusses a variety of tunnel types which might be used in a network but does not offer an y reason why advertising the tunnel types supported is of benefit. Given this information is only advertised within a single administrative domain it does not seem to provide any information that is not already known to the network operator. It also logically leads to requiring a configuration for what tunnel types to advertise. If this information is meant to drive automatic configuration of tunnels I presume that the network operator would want to limit what is advertised - not simply accept what the implementation is capable of supporting. So it seems we have simply traded one configuration for another.  I would like to see more detail on this before deciding whether it is worth doing.

It is clear that the information is not at all useful to IS-IS itself - which brings me to my second concern. This is advertising information that has nothing to with IS-IS. Router Capabilities is not meant to be used as a vehicle to advertise information not of direct use to the protocol. In fact, the existence of a couple of exceptions to this guideline is what prompted the creation of GENAPP (RFC 6823) as the appropriate place to advertise such information.

I would like to see further discussion of the above before deciding that WG adoption (which almost always indicates an intent to progress to RFC) is appropriate.

    Les


From: Isis-wg [mailto:[e-mail]] On Behalf Of Christian Hopps
Sent: Monday, November 30, 2015 11:45 PM
To: [e-mail] list
Subject: Re: [Isis-wg] WG Adoption Call for draft-xu-isis-encapsulation-cap

[It seems due to some sneaky cut and paste error, the URL was wrong in the original email, I've corrected in this message]

Hi Folks,

The authors have requested the IS-IS WG adopt:

https://datatracker.ietf.org/doc/draft-xu-isis-encapsulation-cap/

as a working group document.

Please indicate support or no-support for taking on this work.

Thanks,
Chris.