Cisco Catalyst 3550

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Catalyst 3550 Multilayer Switch Command Reference
OL-8566-01
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
wrr-queue threshold
wrr-queue threshold
Use the wrr-queue threshold interface configuration command to assign tail-drop threshold
percentages to each egress queue of a Gigabit-capable Ethernet port. Use the no form of this command
to return to the default setting.
wrr-queue threshold queue-id threshold-percentage1 threshold-percentage2
no wrr-queue threshold queue-id
Syntax Description
Defaults When QoS is enabled, tail-drop is enabled.
The tail-drop thresholds are 100 percent for both thresholds 1 and 2.
Command Modes Interface configuration
Command History
Usage Guidelines QoS uses the DSCP-to-threshold map to determine which Differentiated Services Code Points (DSCPs)
are mapped to threshold 1 and threshold 2. If threshold 1 is exceeded, packets with DSCPs assigned to
this threshold are dropped until the threshold is no longer exceeded. However, packets assigned to
threshold 2 continue to be queued and sent as long as the second threshold is not exceeded.
You configure the DSCP-to-threshold map by using the wrr-queue dscp-map interface configuration
command on the ingress interface.
The wrr-queue threshold and the wrr-queue random-detect threshold commands are mutually
exclusive, and only tail-drop or Weighted Random Early Detection (WRED) thresholds can be
configured.
queue-id ID of the egress queue. The range is 1 to 4, where the higher ID has a
higher priority.
threshold-percentage1
threshold-percentage2
Two tail-drop threshold percentage values. Each threshold value is a
percentage of the total number of queue descriptors allocated for the
queue. Separate each value with a space. The percentage range is 1 to
100.
Release Modification
12.1(4)EA1 This command was introduced.