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

[Fortune HUANG <fqhuang at huawei.com>]

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.

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-behaviour-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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