Random-Detect Precedence - Cisco ME 3800X Command Reference Manual
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Chapter 2
Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
random-detect precedence
To configure WRED parameters for a particular IP Precedence for a class policy in a policy map, use the
random-detect precedence command in policy-map class configuration mode. To return the values to
the default for the precedence, use the no form of this command.
Syntax Description
precedence
min-threshold
max-threshold
mark-probability-denominator Denominator for the fraction of packets dropped when the average
Command Default
For all precedences, the mark-probability-denominator default is 10, and the max-threshold is based on
the output buffering capacity and the transmission speed for the interface.
The default min-threshold depends on the precedence. The min-threshold for IP Precedence 0
corresponds to half of the max-threshold. The values for the remaining precedences fall between half the
max-threshold and the max-threshold at evenly spaced intervals. See
section of this command for a list of the default minimum threshold values for each IP Precedence.
Command Modes
Policy-map class configuration (config-pmap-c)
Command History
Release
15.1(2) EY
Usage Guidelines
WRED is a congestion avoidance mechanism that slows traffic by randomly dropping packets when
congestion exists.
OL-28238-01
random-detect precedence precedence_value min-threshold max-threshold
mark-probability-denominator
no random-detect precedence
Modification
This command was introduced.
IP Precedence number. The value range is from 0 to 7.
Minimum threshold in number of packets. The value range of this
argument is from 1 to 4096. When the average queue length reaches
the minimum threshold, WRED randomly drops some packets with
the specified IP Precedence.
Maximum threshold in number of packets. The value range of this
argument is from the value of the min-threshold argument to 4096.
When the average queue length exceeds the maximum threshold,
WRED drops all packets with the specified IP Precedence.
queue depth is at the maximum threshold. For example, if the
denominator is 512, 1 out of every 512 packets is dropped when the
average queue is at the maximum threshold. The value range is from
1 to 65536. The default is 10; 1 out of every 10 packets is dropped at
the maximum threshold.
Cisco ME 3800X and ME 3600X Switch Command Reference
random-detect precedence
Table 5
in the "Usage Guidelines"
2-235
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