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Re: [aqm] I-D Action: draft-ietf-aqm-recommendation-04.txt

"Fred Baker (fred)" <fred@cisco.com> Mon, 25 May 2015 06:12 UTC

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From: "Fred Baker (fred)" <fred@cisco.com>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Thread-Topic: [aqm] I-D Action: draft-ietf-aqm-recommendation-04.txt
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Date: Mon, 25 May 2015 06:12:11 +0000
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References: <20140514180039.16149.79444.idtracker@ietfa.amsl.com> <554D8240.7050809@superduper.net> <20150510015811.GB53172@verdi> <5552CDA8.3040305@superduper.net> <3F128D69-8283-4EEC-93E6-D9B980AE44C1@cisco.com> <555A0ACA.3010903@kit.edu> <5562121C.2050801@superduper.net> <alpine.DEB.2.02.1505242031260.9487@uplift.swm.pp.se> <55621B52.1030109@superduper.net> <alpine.DEB.2.02.1505250631200.9487@uplift.swm.pp.se>
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Cc: Simon Barber <simon@superduper.net>, "aqm@ietf.org" <aqm@ietf.org>
Subject: Re: [aqm] I-D Action: draft-ietf-aqm-recommendation-04.txt
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> On May 24, 2015, at 9:31 PM, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> 
> I don't understand the difference between AF1 and CS1. Please elaborate.

RFC 2597: any AF class (there are four rate-based classes, named AFx) has three different quanta (called AFxy) at which drop probability can change. One has a low drop probability if, during a given time interval, one has sent less than some quantum of data. If one has sent more than that but less than a second amount, one has an increased drop probability. If one has sent more than the second but less than a third amount, one has an even more increased drop probability. Crossing that third line, All traffic is presumably dropped.

RFC 3662: assuming one has a priority queuing system, CS1 traffic occupies the lowest priority, and a packet in that queue might be held for at most some time interval or dropped when the queue becomes too deep. The description in the RFC isn't CoDel, but CoDel would work well there.

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