A station advertising
the FULL_RATE always identifies itself as the origin. In all other cases, the origin
is the station whose locally computed fairRate and source MAC address is carried by
the advertisement. The advertisement also carries a time to live field that is assigned
the value 255 by the originating station and is decremented by each station through
which it passes. Stations receiving an advertisement can infer the originating station
by examining the MAC address or the time to live fields.
Two methods of adjusting the fairRate are defined: Aggressive and Conservative.
Aggressive The Aggressive method provides responsive adjustments that favor utilization
of capacity over rate stability. The rates can be changed without significant
delay and amounts of rate change are not highly damped. Stations transition immediately
to the uncongested state after the congestion conditions are removed.
The aggressive method is the simpler of the two.
Conservative The conservative method differs from the aggressive method in that
a station can remain in a congested state after the congestion conditions are removed.
This provides hysteresis in the transition between congested and uncongested states
and prevents rate oscillation.
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