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Re: [RPRWG] Question about the Fairness Message

Dr. Zhou,

The fairness messages are generated with a TTL=255 and TTL value is decrement by
1 at every intermediate node. Fairness messages also contain the SA of the node
that originated the message. Hence, it is very easy for the receiving station to
figure out the exact location of the congestion or the hop count, i.e., 256- TTL
received, or use topology.

Khalid please see my comments in line.



Khaled Amer wrote:

> Dr. Zhou,
> The Rate Adhoc committee (RAH) is looking into addressing these questions
> and clarifying how it would work and make changes as/if needed.

RAH is not addressing his question at the moment as there was not any question
raised and identified as the one to be dealt with. And the answer to his
question is very clearly stated in 802.17D0.2, please read it.

> We're
> meeting on a weekly basis and discussing all of these issues and many more.
> I believe that any answer we give right now may be incomplete and may change
> based on the outcome of this effort.

I do not how it would be incomplete if it is already in the draft and clearly
I do not think these kind of comments will help the standardization activities

> I suggest that you hold your questions
> till the July meeting.
> Regards,
> Khaled Amer
> President, AmerNet Inc.
> Architecture Analysis and Performance Modeling Specialists
> Address:     13711 Solitaire Way, Irvine, CA 92620
> Phone:        (949)552-1114                      Fax:     (949)552-1116
> e-mail:         amer@xxxxxxxxxxx
> Web: 
> ----- Original Message -----
> From: "Zhou" <xbzhou@xxxxxxx>
> To: <stds-802-17@xxxxxxxx>
> Sent: Thursday, May 30, 2002 12:47 AM
> Subject: [RPRWG] Question about the Fairness Message
> >
> >
> > Hi,
> >   As defined in D0.2, the type A and type B fairness messages are sent out
> periodically to propagate fair rate information to upstream nodes. In
> another word, it means that all congested or uncongested nodes both send
> this fairness message onto the ring. Assume that one node received the
> fairness message from another node, but how could the node judge which node
> is congested ? And then how could the node get the number of hops to the
> congested node?
> >
> > Best Regards,
> > X.B.Zhou
> > PHD. of Tsinghua University
> > email:xbzhou@xxxxxxx
> > 2002-05-30