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Quality of Service (QoS) Commands
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ProSafe M4100 and M7100 Managed Switches
random-detect exponential weighting-constant
Use this command to configure the WRED decay exponent for a CoS queue interface.
Format random-detect exponential-weighting-constant 0-15
Modes
• Global Config
• Interface Config
Default
no random-detect exponential weighting-constant
Use this command to reset the WRED decay exponent to the default value on all interfaces
or one interface.
Format no random-detect exponential-weighting-constant 0-15
Modes
• Global Config
• Interface Config
random-detect queue-parms
Use this command to configure WRED parameters for each drop precedence level supported
by a queue. Use it only when per-COS queue configuration is enabled (using the cos-queue
random-detect command).
min-thresh is the minimum threshold the queue depth (as a percentage) where WRED starts
marking and dropping traf
fic.
max-thresh is the maximum threshold is the queue depth (as a percentage) above which
WRED marks / drops all traffic.
drop-probability is the percentage probability that WRED will mark/drop a packet, when the
queue depth is at the maximum threshold. (The drop probability increases linearly from 0 just
before the minimum threshold, to this value at the maximum threshold, then goes to 100% for
larger queue depths). Each parameter is specified for each possible drop precedence ("color"
of TCP
traffic).
The last precedence applies to all non-TCP traffic. For example, in a 3-color system, four of
each parameter specified: green
TCP, yellow TCP, red TCP, and non-TCP, respectively.
Format random-detect queue-parms queue-id-1 [queue-id-2 … queue-id-n]
minthresh thresh-prec-1 … thresh-prec-n max-thresh thresh-prec-1 …
threshprec-n drop-probability prob-prec-1 … prob-prec-n
Modes
• Global Config
• Interface Config
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