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RE: [RPRWG] Question about the Fairness Message


My impression is the following:
  1) The source address of fairness messages identifies
     which station provided that congestion information.
  2) The TTL field indicates the number of hops from
     the source.
Of course, (2) is dependent on not overloading TTL for
destination station addressing, which some folks (not me)
continue to advocate.


David V. James, PhD
Chief Architect
Network Processing Solutions
Data Communications Division
Cypress Semiconductor, Bldg #3
3901 North First Street
San Jose, CA 95134-1599
Work: +1.408.545.7560
Cell: +1.650.954.6906
Fax:  +1.408.456.1962
Work: djz@xxxxxxxxxxx
Base: dvj@xxxxxxxxxxxx

> -----Original Message-----
> From: owner-stds-802-17@xxxxxxxxxxxxxxxxxx 
> [mailto:owner-stds-802-17@xxxxxxxxxxxxxxxxxx]On Behalf Of Zhou
> Sent: Thursday, May 30, 2002 12:47 AM
> To: stds-802-17@xxxxxxxx
> 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