Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L4S vs SCE (Evolvability))
Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Fri, 03 January 2020 09:13 UTC
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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Jonathan Morton <chromatix99@gmail.com>, Ingemar Johansson S <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org>
CC: "Black, David" <David.Black@dell.com>, Bob Briscoe <ietf@bobbriscoe.net>, Roland Bless <roland.bless@kit.edu>, "tsvwg-chairs@ietf.org" <tsvwg-chairs@ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: [tsvwg] RFC 4301 on ECN codepoints (was RE: L4S vs SCE (Evolvability))
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Date: Fri, 03 Jan 2020 09:13:54 +0000
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Subject: Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L4S vs SCE (Evolvability))
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Hi Jonathan Thanks for the response. I assume then that RFC4301 should be listed as a possible issue for SCE, as already pointed out by Bob ? /Ingemar > -----Original Message----- > From: Jonathan Morton <chromatix99@gmail.com> > Sent: den 2 januari 2020 23:04 > To: Ingemar Johansson S > <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org> > Cc: Black, David <David.Black@dell.com>; Bob Briscoe <ietf@bobbriscoe.net>; > Roland Bless <roland.bless@kit.edu>; Ingemar Johansson S > <ingemar.s.johansson@ericsson.com>; tsvwg-chairs@ietf.org; tsvwg@ietf.org > Subject: Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L4S vs SCE > (Evolvability)) > > > On 2 Jan, 2020, at 12:13 pm, Ingemar Johansson S > <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org> wrote: > > > > I read in https://tools.ietf.org/html/rfc4301#section-5.1.2.1 the > > following > > > > (6) If the ECN field in the inner header is set to ECT(0) or > > ECT(1), where ECT is ECN-Capable Transport (ECT), and if the > > ECN field in the outer header is set to Congestion Experienced > > (CE), then set the ECN field in the inner header to CE; > > otherwise, make no change to the ECN field in the inner > > header. (The IPv4 checksum changes when the ECN changes.) > > > > So, if we have an SCE flow that is tunneled: > > 1) At the tunnel ingress, the ECN bits are copied to the outer header. > > 2) Somewhere along the tunneled path an SCE compatible AQM remarks > > from ECT '10' to SCE '01'. > > 3) At tunnel egress, given rule #6 above, I understand that the inner > > header will still be ECT '10'. > > > > In order words, the SCE congestion marks along the tunneled interface > > become ignored and the queue will grow until packets are either CE > > marked, or dropped. > > > > Is this a correct interpretation ? > > Yes. It would be as if the SCE-aware AQM on the tunnel path was merely RFC- > 3168 compliant, if the tunnel exit node correctly implements the above > language. > > - Jonathan Morton
- [tsvwg] RFC 4301 on ECN codepoints (was RE: L4S v… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Black, David
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Jonathan Morton
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Sebastian Moeller
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Sebastian Moeller
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Jonathan Morton
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Sebastian Moeller
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Bob Briscoe
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Sebastian Moeller
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… alex.burr@ealdwulf.org.uk
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Sebastian Moeller
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Ingemar Johansson S
- Re: [tsvwg] RFC 4301 on ECN codepoints (was RE: L… Sebastian Moeller