Re: [PCN] New edge behaviour:draft-karagiannis-pcn-hose-edge-behaviour-00

["Georgios Karagiannis" <karagian at cs.utwente.nl>]

Hi Arjen

Thank you very much for your comments!
Please see in line!
 

> -----Original Message-----
> From: Holtzer, A.C.G. (Arjen) [mailto:arjen.holtzer at tno.nl] 
> Sent: vrijdag 6 november 2009 15:03
> To: Georgios Karagiannis
> Cc: PCN at ietf.org
> Subject: RE: [PCN] New edge 
> behaviour:draft-karagiannis-pcn-hose-edge-behaviour-00
> 
> Hello Georgios,
> 
> I think that the proposed combination of signalling and 
> PCN-marking really has advantages for solving the ECMP issue 
> and am interested in seeing how it would perform (in both the 
> trunk and HOSE model). I think the draft clearly explains the 
> proposed mechanisms. I have two minor
> remarks:
> 
> 1) Maybe the addition of a short description of the actual 
> ECMP problem that is solved here would make the draft more complete.

Georgios: yes that is a good idea. The next version of the draft will
include this description.

> 
> 2) Section 2, bullet 5a says:
> 	
> "the interior SHOULD preferentially drop unmarked packets 
> instead of marked packets". 
> 
> Shouldn't this be changed into:
> 
> "the interior node SHOULD preferentially drop unmarked or 
> Threshold marked packets instead of Excess marked packets"?

Georgios: Yes you are right! This is actually what we were willing to say,
but is written in 
a wrong way! We will correct it in the next version of the draft!

Best regards,
Georgios



> 
> Best regards,
> Arjen 
> 
> > -----Original Message-----
> > From: pcn-bounces at ietf.org [mailto:pcn-bounces at ietf.org] On 
> Behalf Of 
> > Georgios Karagiannis
> > Sent: woensdag 21 oktober 2009 15:59
> > To: pcn at ietf.org
> > Subject: [PCN] New edge
> > behaviour:draft-karagiannis-pcn-hose-edge-behaviour-00
> > 
> > 
> >  Hi all
> > 
> > During the last two IETF meetings I had promissed to 
> publish the HOSE 
> > edge behaviour draft.
> > 
> > Via the following URL you can find this draft:
> > 
> > http://www.ietf.org/id/draft-karagiannis-pcn-hose-edge-behavio
> > ur-00.txt
> > 
> > If you have any comments please let me know!
> > 
> > --------------------------------------------------------
> > 
> >    Abstract ++
> > 
> >    Precongestion notification (PCN) is a means for 
> protecting quality 
> > of
> >    service for inelastic traffic admitted to a Diffserv domain.  The
> >    overall PCN architecture is described in RFC 5559.  This memo is 
> > one
> >    of a series describing possible boundary node behaviours 
> for a PCN
> >    domain.  The behaviour described here is denoted as the 
> HOSE model.
> >    In this document the term HOSE is referring to the
> >    aggregation of incoming traffic from all ingress edges, which is
> >    associated with one traffic class, i.e., PHB, towards one egress
> >    edge.  This type of HOSE model is equivalent to the 
> Multiple Point 
> > to
> >    Point (MP2P) type of aggregation.
> > 
> >    The HOSE model ensures bandwidth limits without the need of
> >    maintaining per each ingress and egress pair ingress-egress-
> >    aggregated states.  In this case all edges maintain one 
> aggregated
> >    state per each traffic class, i.e., PHB (Per Hop 
> Behaviour), used 
> > in
> >    the PCN domain. Moreover, the HOSE model is able to provide 
> > solutions
> >    for the ECMP (Equal Cost Multi Path) problem for both admission
> >    control and flow termination procedures.
> > 
> > 
> > -------------------------------------
> > 
> > 
> > 
> > Best regards,
> > Georgios
> > 
> > 
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> > 
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