ModificationRelease
The units argument was added to allow specifying the units of the thresholds.
Release 3.3.0
The exp-value min-threshold max-threshold arguments were deleted form
the no random-detect exp command.
Release 3.4.0
The exp-value argument can accept up to eight values separated by commas.
Release 3.6.0
For the random-detect exp command to take effect, there is no longer a
requirement to configure the shape average, bandwidth (QoS), or
bandwidth remaining commands in the user-defined policy map class.
Release 3.9.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
WRED is a congestion avoidance mechanism that slows traffic by randomly dropping packets when congestion
exists. WRED is most useful with protocols like TCP that respond to dropped packets by decreasing the
transmission rate.
When the value of the units argument is packets, packets are assumed to be 256 bytes in size.
Task ID
OperationsTask ID
read, writeqos
Examples
The following example shows that for Multiprotocol Label Switching (MPLS) packets with an EXP field
value of 4, the WRED minimum threshold is 1,000,000 bytes and the maximum threshold is 2,000,000 bytes:
RP/0/RP0/CPU0:router(config)# policy-map policy1
RP/0/RP0/CPU0:router(config-pmap)# class class1
RP/0/RP0/CPU0:router(config-pmap-c)# random-detect exp 4 1000000 20000
Related Commands
DescriptionCommand
Specifies the name of the class whose policy you want to create or
change.
class (policy-map), on page 10
Creates or modifies a policy map that can be attached to one or more
interfaces to specify a service policy.
policy-map, on page 67
Configures the Weighted Random Early Detection (WRED) thresholds
for packets with a specific differentiated services code point (DSCP)
value.
random-detect dscp, on page 84
Configures the Weighted Random Early Detection (WRED) thresholds
for packets with a particular IP precedence.
random-detect precedence, on page
90
Cisco IOS XR Modular Quality of Service Command Reference for the Cisco CRS Router, Release 4.0
88 OL-23235-03
Quality of Service Commands on the Cisco IOS XR Software
random-detect exp
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