DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
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specified, the default threshold setting is used.
Default
By default, this option is disabled.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
When a packet arrives, the current average queue size is calculated by hardware.
weight
Qsize
current
Qsize
avg
old
Qsize
current
Qsize
avg
2
_
_
_
_
_
−
+
=
If the current average queue size is less than the minimum threshold value of the queue, the arriving
packet is queued. If the current queue length is between the minimum threshold value and the maximum
threshold value of the queue, the packet is either dropped or queued depending on the packet drop
probability. The drop probability is calculated by the following formula.
e
MaxDropRat
ld
MinThresho
ld
MaxThresho
ld
MinThresho
Qsize
avg
obability
Drop
*
_
Pr
−
−
=
If the average queue size is greater than the maximum threshold value of the queue, all packets will be
dropped. If the specified profile does not exist, then default setting of the threshold will be associated.
Example
This example shows how to enable the WRED function on Ethernet 1/0/1 queue 5 and apply the WRED
profile 10.
Switch# configure terminal
Switch(config)# interface ethernet 1/0/1
Switch(config-if)# random-detect 5 profile 10
Switch(config-if)#
122-3
random-detect ecn
This command is used to enable the explicit congestion notification (ECN).Use the
no
form of the
command to disable it.
random-detect ecn COS-VALUE
no random-detect ecn COS-VALUE
Parameters
COS-VALUE
Specifies the CoS queues on which ECN will be enabled or disabled.
The valid range is from 0 to 7.
Default
By default, this option is disabled.
Command Mode
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