3Com 8807 Configuration Manual page 198

198 C 22: Q S C
HAPTER O ONFIGURATION
c
Configuring WRED parameters
The switch provides four sets of default WRED parameters, respectively numbered
as 0 to 3. Each set includes 80 parameters, 10 parameters for each of the eight
queues. The ten parameters are green-min-threshold, yellow-min-threshold,
red-min-threshold, green-max-threshold, yellow-max-threshold,
red-max-threshold, green-max-prob, yellow-max-prob, red-max-prob and
exponent. Red, yellow and green packets respectively refer to those with drop
precedence levels 2, 1 and 0.
Perform the following configurations in the specified views.
Table 172 Configure WRED parameters
Operation
Enter WRED index view (system
view)
Restore the default WRED
parameters (system view)
Configure WRED parameters
(WRED index view)
Restore the default WRED
parameters (WRED index)
Exit WRED index view (WRED
index view)
The command restores the parameters of the specified WRED index as the default
setting. The command restores the WRED parameters related to the queue as the
default setting.
The switch provides four sets of WRED parameters by default.
CAUTION: When multicast packets are sent through a certain port outbound
queue, it is necessary to use the queue command to increase appropriately the
length parameter of the corresponding queue where packets are all dropped to
ensure the best effect of the replication capability of the egress port.
See the corresponding Command Manual for details of the commands.
Configuring drop algorithm
Please perform the following configurations in Ethernet port view.
Table 173 Configure drop algorithm
Operation
Configure drop algorithm
Restore the default algorithm
By default, tail drop mode is selected.
See the corresponding Command Manual for details of the commands.
Command
wred wred-index
undo wred wred-index
queue queue-id green-min-threshold green-max-threshold
green-max-prob yellow-min-threshold yellow-max-threshold
yellow-max-prob red-min-threshold red-max-threshold
red-max-prob exponent
undo queue queue-id
quit
Command
drop-mode { tail-drop | wred } [ wred-index ]
undo drop-mode