RE: WG Last Call : draft-ietf-tewg-measure-04.txt

["Lai, Wai S (Waisum), ALABS" <wlai@att.com>]

Dimitri,
  Many thanks for your comment on our draft.  Based on our
discusssion, to clarify the intent of the quoted paragraph (in
Section 5.3) below, we are going to add right after it the
following text:

(An example of such a feedback mechanism is described in [Ref].
As described therein, care should be exercised to ensure network
stability and consistency for any mechanism that makes direct
operational use of measurement (e.g., to use as feedback into path
computation).  However, such issues will not be dealt with here
as this framework document is mainly concerned with the definitions
and principles of measurements, rather than their usage to
subsequently ensure other network features such as accurate
bandwidth allocation.)
[Ref] P. Ashwood-Smith, B. Jamoussi, D. Fedyk, and D. Skalecki,
"Improving Topology Data Base Accuracy with Label Switched Path
Feedback in Constraint Based Label Distribution Protocol,"
Internet-Draft, Work in Progress, November 2002.

Thanks, Wai Sum

-----Original Message-----
From: Dimitri.Papadimitriou@alcatel.be
[mailto:Dimitri.Papadimitriou@alcatel.be]
Sent: Sunday, January 19, 2003 7:39 AM
To: Jim Boyle
Cc: te-wg@ops.ietf.org
Subject: Re: WG Last Call : draft-ietf-tewg-measure-04.txt


jim, all,

in section 5.3, would it be possible to detail the
real scope behind the following paragraph:

"Providing a feedback mechanism in the reverse flow messaging of 
 RSVP-TE or CR-LDP signaling in MPLS to report on actual topology 
 state information such as link bandwidth availability."

more precisely, detail the relationship between "signalling
in mpls" and the report to "actual topology state information" 
since there are imho several ways to interpret the above 
sentence

thanks,
- dimitri.

Jim Boyle wrote:
> 
> This draft has definitely honed itself to its purpose from its
earliest
> versions.  However it never appears to get wide comment or show of
hands
> of folks that have reviewed it.
> 
> So... Please do so.
> 
> I'll give us 3 weeks for folks to comment along these lines.
> 
> 1) is this draft on-target for the TE measurements milestone we have
in
>    our charter?  If you think it is off-target I would be interested
>    in hearing how we should deal with this portion of our charter.
> 
> 2) minor / editorial comments to list and/or author
> 
> 3) substantial comments to list
> 
> Last call will end February 7.
> 
> thanks!
> 
> Jim Boyle
> 
> On Fri, 10 Jan 2003 Internet-Drafts@ietf.org wrote:
> 
> > A New Internet-Draft is available from the on-line Internet-Drafts
directories.
> > This draft is a work item of the Internet Traffic Engineering
Working Group of the IETF.
> >
> >       Title           : A Framework for Internet Traffic Engineering
> >                           Measurement
> >       Author(s)       : W. Lai, R. Tibbs, S. Van den Berghe
> >       Filename        : draft-ietf-tewg-measure-04.txt
> >       Pages           : 26
> >       Date            : 2003-1-10
> >
> > In this document, a measurement framework for supporting the traffic
> > engineering of IP-based networks is presented.  Uses of traffic
> > measurement in service provider environments are described, and
> > issues related to time scale and read-out period are discussed.
> > Different measurement types are classified, with each being
> > specified as a meaningful combination of a measurement entity and a
> > measurement basis.
> > For interoperable compatibility, uniform definitions across vendors
> > and operators must be ensured, e.g., in the distinction between
> > offered load and achieved throughput.  To aid network dimensioning,
> > mechanisms to collect node-pair-based traffic data should be
> > developed to facilitate the derivation of per-service-class traffic
> > matrix statistics.  For service assurance, there is a need for the
> > use of higher-order statistics.  To preserve representative traffic
> > detail at manageable sample volumes, there is a need for packet-
> > sampled measurements.  To manage large volume of measured data, use
> > of bulk transfer and filtering/aggregation mechanisms may be
> > appropriate.
> >
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> > http://www.ietf.org/internet-drafts/draft-ietf-tewg-measure-04.txt
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-- 
Papadimitriou Dimitri 
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