Weight for exponential moving average of loss rate for
weighted excess packet discard algorithm to maintain.
The higher value of the weight makes the algorithm
more sensitive to the recent bandwidth usage by the Sid.
The default value is 1 and whenever the rate limiting
algorithm is changed to weighted excess packet discard
algorithm, this value will be reset to the default 1.
If the rate limiting algorithm is not weighted excess
packet discard algorithm, the value will be always the
default value 1.