Thus, dropping packets does not decrease congestion. WRED treats non-IP traffic as precedence 0, the lowest precedence. Therefore, non-IP traffic, in general, is more likely to be dropped than IP traffic. The router automatically determines parameters to use in the WRED calculations. The average queue size is based on the previous average and the current size of the queue.
Cisco recommends using the default value for the exponential weight factor.
Change this value from the default only if you have determined that your situation would benefit from using a different value. For high values of n, the previous average becomes more important. A large factor smooths out the peaks and lows in queue length. The average queue size is unlikely to change very quickly, avoiding drastic swings in size. The WRED process will be slow to start dropping packets, but it may continue dropping packets for a time after the actual queue size has fallen below the minimum threshold.