Re: [PCN] Second Last Call for draft-ietf-pcn-architecture

[Michael Menth <menth at informatik.uni-wuerzburg.de>]

Hi Phil,

I still have concerns regarding the nomenclature in the current version 
of the architecture draft.

Take Figure 1 on page 10. The terms PCN-threshold-rate and 
PCN-excess-rate are meaningful only in the CL deployment scenario where 
the reference rate for the threshold marker is the PCN-threshold-rate 
and the reference rate for the excess marker is the PCN-excess-rate. 
This is different for the SM deployment scenario where the reference 
rate of the excess marker must be set to the PCN-threshold-rate. How 
funny is that? No, it's not funny - this is confusing and makes further 
explanations cumbersome and prone to misunderstandings. I think that 
this is a bug that should be corrected before publication as these terms 
help to describe the core idea of PCN. Using the term admissible rate 
instead of PCN-threshold-rate and supportable rate instead of 
PCN-excess-rate decouples PCN rate thresholds from marking mechanisms. 
They express the meanings of these thresholds within the PCN concept 
which are denoted on the right side in Figure 1 and allow a much clearer 
presentation of the concept.

I hope my reasoning is clear. This document is not a working document 
for a closed group where nomenclature has no importance as long as 
everybody knows that we mean pears if we say apples - it's a reference 
for others to learn about PCN and, therefore, technical terms should be 
precise and easy to remember.

Regards,

   Michael

philip.eardley at bt.com wrote:
> { 
> { There are some known edits that have to be made before we can submit
> to
> { the
> { IESG:
> { 
> { - Correct references to Internet Drafts to indicate "Work in Progress"
> { - Fix formatting errors detected by ID-nits
>
> I just fixed these (I think) in
> http://www.ietf.org/internet-drafts/draft-ietf-pcn-architecture-07.txt 
> The only changes from 06 to -07 are to re-format some of the references
> in order to fix the above 2 points. 
>
> Phil
>
> Ps to see the -05 to -06 diffs:
> http://tools.ietf.org/wg/pcn/draft-ietf-pcn-architecture/draft-ietf-pcn-
> architecture-06-from-05.diff.html 
> or from http://tools.ietf.org/wg/pcn/draft-ietf-pcn-architecture/ 
> _______________________________________________
> PCN mailing list
> PCN at ietf.org
> https://www.ietf.org/mailman/listinfo/pcn
>   

--
Dr. Michael Menth, Assistant Professor
University of Wuerzburg, Institute of Computer Science
Am Hubland, D-97074 Wuerzburg, Germany, room B206
phone: (+49)-931/888-6644, fax: (+49)-931/888-6632
mailto:menth at informatik.uni-wuerzburg.de
http://www3.informatik.uni-wuerzburg.de/research/ngn

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