Re: [mpls] [Tsvwg] multiple-working group last call on draft-ietf-mpls-cosfield-def-04.txt
Ben Niven-Jenkins <benjamin.niven-jenkins@bt.com> Mon, 21 July 2008 15:19 UTC
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Date: Mon, 21 Jul 2008 16:14:43 +0100
Subject: Re: [mpls] [Tsvwg] multiple-working group last call on draft-ietf-mpls-cosfield-def-04.txt
From: Ben Niven-Jenkins <benjamin.niven-jenkins@bt.com>
To: John Kenney <johnkenney@alumni.nd.edu>, Loa Andersson <loa@pi.nu>
CC: L2VPN <l2vpn@ietf.org>, mpls@ietf.org, tsvwg@ietf.org, Bob Briscoe <rbriscoe@jungle.bt.co.uk>, ccamp <ccamp@ops.ietf.org>, pwe3 <pwe3@ietf.org>, ahtmpls@itu.int
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Thread-Topic: [mpls] [Tsvwg] multiple-working group last call on draft-ietf-mpls-cosfield-def-04.txt
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I'm not precious about which term we use but if we use Traffic Management I think a paragraph should be added explaining what is meant to put it in context. Ben On 21/07/2008 15:07, "John Kenney" <johnkenney@alumni.nd.edu> wrote: > Hi Loa, > > This is a good draft. It's time to rename the EXP field. While CoS > Field may have been a good choice at one time, we've now heard from many > who think it is too narrow for current usage of this field. > > I suggest "Traffic Management Field". > > Traffic management is a common, generic, and concise term. It covers > all current uses of the field: scheduling class, drop priority, and > congestion notification. CoS really only covers the first. Traffic > management is well-scoped to this purpose, and clearly preferable to CoS > in my opinion. > > In terms of the draft, I think a simple global substitution of "traffic > management" for "class of service" and of "TM" for "CoS" should suffice. > > I think in the long run we'll be glad if we bite the bullet now and make > this change. > > Best Regards, > John > > > Loa Andersson wrote: >> >> Bob, >> >> thanks for useful comments :) >> >> Bob Briscoe wrote: >>> Loa, >>> >>> I believe this draft has no technical effect. However there is some >>> truth in the idea that names are important. >>> >>> So, let's set aside a few clock cycles to consider this... >>> >>> 1/ Is CoS a good description of ECN? Given RFC5129 (Using the EXP >>> field for ECN in MPLS), is it really appropriate now to call this a >>> CoS field? >>> >>> Thinking out loud... >>> - CoS is a signal from an ingress to the interior (a request for a >>> certain class of service), >>> - whereas ECN is a signal from the interior forwarding plane to the >>> egress (a response from the interior saying whether the class of >>> service requested was congested). >>> >>> The way 5129 was done, two (or more) EXP codepoints can be designated >>> as the same CoS, but one can be used to say "this packet experienced >>> congestion when using this CoS", while the other says "it didn't". >>> So, I guess I could live with this field being called CoS, even >>> though it's not strictly correct. I can't think of anything better. >> >> We had the same discussion when we started to discuss this draft, we >> wanted to find a name the covered both cases. We just couldn't come >> with a better name, so we said "Let us call it 'CoS Field'" and change >> it someone comes up with something better. >> >> I'm still open to do that change, but time is kind of running out, the >> latest point in time we can do this change is an RFC editor note, when >> the IESG has approved the document. >
- multiple-working group last call on draft-ietf-mp… Loa Andersson
- Re: [Tsvwg] multiple-working group last call on d… Loa Andersson
- Re: [mpls] [Tsvwg] multiple-working group last ca… Ben Niven-Jenkins
- RE: [Tsvwg] [mpls] multiple-working group last ca… Drake, John E