H3C S6812 Series Command Reference Manual page 1618

dropped at random. The longer the queue is, the higher the drop probability is. When the average
queue size exceeds the upper threshold, subsequent packets are dropped.
Examples
# In queue-based WRED table queue-table1, configure the following drop-related parameters for
packets in queue 1:
•
The drop level is 1.
•
The lower limit for the average queue length is 10.
•
The upper limit for the average queue length is 20.
•
The drop probability is 30%.
<Sysname> system-view
[Sysname] qos wred queue table queue-table1
[Sysname-wred-table-queue-table1] queue 1 drop-level 1 low-limit 10 high-limit 20
discard-probability 30
Related commands
display qos wred table
qos wred queue table
queue ecn
Use queue ecn to enable ECN for a queue.
Use undo queue ecn to restore the default.
Syntax
queue queue-id ecn
undo queue queue-id ecn
Default
ECN is disabled for a queue.
Views
WRED table view
Predefined user roles
network-admin
Parameters
queue-id: Specifies a queue by its ID in the range of 0 to 7.
Usage guidelines
When both the receiver and sender support ECN, the device can notify the peer end of the
congestion status by identifying and setting the ECN flag. ECN avoids deteriorating congestion.
Examples
# In WRED table queue-table1, enable ECN for queue 1.
<Sysname> system-view
[Sysname] qos wred queue table queue-table1
[Sysname-wred-table-queue-table1] queue 1 ecn
Related commands
display qos wred table
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