EtherHaul Operation, Administration and Maintenance Manual
Page 89
Figure 9-10 TCP Performance
9.8.6.1 WRED Functionality
When a packet arrives, WRED handles it according to the following process:
1) The average queue size is calculated using the following equation:
Average = (old_average * (1-1/2^n)) + (current_queue_size * 1/2^n).
2) The packet is filtered according to its size.
If the average queue size is below the minimum queue threshold, the packet is
queued normally.
If the average queue size is greater than the maximum threshold, the packet is
automatically dropped.
If the average queue size is between the minimum and maximum queue
threshold, the packet is either dropped or queued depending on the packet’s
drop probability.
9.8.6.2 WRED Parameters
Minimum and Maximum Thresholds - When the system uses color aware
configuration, it requires the use of thresholds per color (green and yellow).
When the system does not use color aware configuration (blind mode), it uses
one set (the Green set) of thresholds.
The difference between the maximum threshold and the minimum threshold
should be large enough to avoid global synchronization of TCP hosts (which can
WRED configuration supported in the CLI only.
To Next Page
Loading...
