Updates to L2TP v2 & v3 for ECN: draft-ietf-tsvwg-rfc6040update-shim-02

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Updates to L2TP v2 & v3 for ECN: draft-ietf-tsvwg-rfc6040update-shim-02

Bob Briscoe-4
Ignacio, Carlos, l2tpext list,

I have posted a rev of this draft with the new arrangement for minimally updating L2TP v2 & v3 to ensure legacy implementations are configured safely. The spec to support ECN properly is now within this draft itself as a RECOMMENDED L2TP extension, but it does not update any L2TP specs.

Pls review and comment.

This is planned to be last-called in tsvwg, deadline Sep 2017.
There is talk of also WGLC'ing in opsawg and int-area I think.

If you think the L2TP aspects should also be WGLC'd elsewhere in parallel, pls say where.
If you think I should give a heads-up presentation in Prague, also pls say where.



-------- Forwarded Message --------
Subject: New Version draft-ietf-tsvwg-rfc6040update-shim-02
Date: Fri, 16 Jun 2017 15:47:58 +0100
From: Bob Briscoe [hidden email]
To: Black, David [hidden email]
CC: tsvwg IETF list [hidden email]

David, as doc shepherd.

I have just posted a major revision to draft-ietf-tsvwg-rfc6040update-shim

Please also take this as a request to give a 10min presentation in tsvwg.

As requested, I included specific text necessary to update certain shim tunnel protocols that didn't mention ECN at all (L2TPv2, L2TPv3, GRE).
There are two others to do:
* Teredo: I'll do this once I hear from the original author, Christian Huitema
* VXLAN-GPE: This is a draft currently going through NVO3 on the standards track. AFAIK the Linux implementation already supports ECN via RFC6040, but the authors will need to add ECN text to the spec, so there is something for other implementations to follow. I have contacted them - they should do this, not me.

I have also added more protocols to the list (e.g. CAPWAP, LISP), but these already supported ECN.

As you have seen, I have been in conversation with people on the l2tpext list, and on opsawg (for CAPWAP). I haven't found anyone specific to talk to regarding GRE yet, but I have notified int-area and I gave a heads-up at a recent IETF.

BTW, your plan was to last call draft-ietf-tsvwg-rfc6040update-shim along with ecn-encap-guidelines, deadline Sep 2017.
I should point out that draft-ietf-trill-ecn-support is in WGLC in trill, and it depends normatively on ecn-encap-guidelines

opsawg would like to last call draft-ietf-tsvwg-rfc6040update-shim as well (altho I have now realized that no update to CAPWAP is needed, but opsawg is now working on alternative tunnelling protocols to CAPWAP: draft-ietf-opsawg-capwap-alt-tunnel ). I guess int-area might want to last call draft-ietf-tsvwg-rfc6040update-shim too.


-------- Forwarded Message --------
Subject: New Version Notification for draft-ietf-tsvwg-rfc6040update-shim-02.txt
Date: Fri, 16 Jun 2017 07:14:46 -0700
From: [hidden email]
To: Bob Briscoe [hidden email]

A new version of I-D, draft-ietf-tsvwg-rfc6040update-shim-02.txt
has been successfully submitted by Bob Briscoe and posted to the
IETF repository.

Name:		draft-ietf-tsvwg-rfc6040update-shim
Revision:	02
Title:		Propagating Explicit Congestion Notification Across IP Tunnel Headers Separated by a Shim
Document date:	2017-06-16
Group:		tsvwg
Pages:		15
URL:            https://www.ietf.org/internet-drafts/draft-ietf-tsvwg-rfc6040update-shim-02.txt
Status:         https://datatracker.ietf.org/doc/draft-ietf-tsvwg-rfc6040update-shim/
Htmlized:       https://tools.ietf.org/html/draft-ietf-tsvwg-rfc6040update-shim-02
Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-rfc6040update-shim-02
Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-tsvwg-rfc6040update-shim-02

   RFC 6040 on "Tunnelling of Explicit Congestion Notification" made the
   rules for propagation of ECN consistent for all forms of IP in IP
   tunnel.  This specification extends the scope of RFC 6040 to include
   tunnels where two IP headers are separated by at least one shim
   header that is not sufficient on its own for packet forwarding.  It
   surveys widely deployed IP tunnelling protocols separated by a shim
   and updates the specifications of those that do not mention ECN
   propagation (L2TPv2, L2TPv3, GRE and Teredo).  The specification also
   updates RFC 6040 with configuration requirements needed to make any
   legacy tunnel ingress safe.


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