Command Manual - QoS/ACL
Quidway S3500 Series Ethernet Switches Chapter 2 QoS Commands
Huawei Technologies Proprietary
2-46
2.3.15 drop-mode
Syntax
drop-mode { tail-drop | wred } [ wred-index ]
undo drop-mode
View
Ethernet port view
Parameter
tail-drop: Tail-drop mode
wred: WRED drop mode
wred-index: WRED index, in the range of 0~3. By default, it is 0.
Description
Using the drop-mode command, you can specify drop mode at a port. Using the undo
drop-mode command, you can restore the default drop mode, i.e., tail-drop mode.
By default, a port is configured with tail-drop mode.
In the case of network congestion, the switch drops packets to release system
resources. And then no packets are put into long-delay queues. The following two drop
modes are available:
z Tail-drop mode: Different queues (red, yellow and red) are allocated with different
drop thresholds. When these thresholds are exceeded respectively, excessive
packets will be dropped.
z WRED drop mode: Drop precedence is taken into account in action. When only
min-thresholds of red, yellow and green packets are exceeded, excessive packets
are dropped randomly at given probability. But when max-thresholds of red, yellow
and green packets are exceeded, all excessive packets will be dropped.
Example
# Select WRED drop mode for the port Ethernet0/1, use the threshold of WRED 0.
[Quidway-Ethernet0/1] drop-mode wred 0
2.3.16 dscp
Syntax
dscp dscp-list : dscp-value cos-value local-precedence-value drop-precedence
undo dscp [ dscp-list ]
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