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

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

Hi Fortune

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

> -----Original Message-----
> From: Fortune HUANG [mailto:fqhuang at huawei.com] 
> Sent: dinsdag 3 november 2009 10:42
> To: 'Georgios Karagiannis'; pcn at ietf.org
> Subject: RE: [PCN] New edge 
> behaviour:draft-karagiannis-pcn-hose-edge-behaviour-00
> 
> Hi Georgios,
> 
> Basically, I think the HOSE model has its great advantage to 
> solve the ECMP issue, which is well described in this draft.
>  
> But I still have a comment that it should be the decision 
> node that makes the decision to admit/block/terminate a flow. 
> According to the PCN architecture, neither PCN-ingress-node 
> nor PCN-egress-node contains the function of making decision. 
> So I think the role of decision node is missing and the 
> behaviour of making decision is misplaced in this draft.

Georgios: You are right, we are not emphasizing which entity is the decision
point. 
Please note that the decision point can be either the ingress, the egress or
a centralized 
decision point. Please note that in a future version of the draft we can
clarify this, 
by explicitly using the notion of the decission point.

Best regards,
Georgios


> 
> Best regards,
> Fortune
> 
> -----Original Message-----
> From: pcn-bounces at ietf.org [mailto:pcn-bounces at ietf.org] On 
> Behalf Of Georgios Karagiannis
> Sent: Wednesday, October 21, 2009 9:59 PM
> 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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