User Guide

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Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
78-14099-04
Chapter 31 Configuring PFC QoS
Configuring PFC QoS
To configure the drop thresholds, perform this task:
This example shows how to configure the receive-queue drop thresholds for Gigabit Ethernet port 1/1:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface gigabitethernet 1/1
Router(config-if)# rcv-queue threshold 1 60 75 85 100
Router(config-if)# end
Router#
This example shows how to verify the configuration:
Router# show queueing interface gigabitethernet 1/1 | begin Receive queues
Receive queues [type = 1p1q4t]:
Queue Id Scheduling Num of thresholds
-----------------------------------------
1 Standard 4
2 Priority 1
Trust state: trust COS
queue tail-drop-thresholds
--------------------------
1 60[1] 75[2] 85[3] 100[4]
<...Output Truncated...>
Router#
Configuring a WRED-Drop Transmit Queue
These port types have only WRED-drop thresholds in their transmit queues:
• 1p2q2t
• 1p2q1t
To configure the drop thresholds, perform this task:
Command Purpose
Step 1
Router(config)# interface {fastethernet |
gigabitethernet} slot/port
Selects the interface to configure.
Step 2
Router(config-if)# rcv-queue threshold queue_id
thr1% thr2% thr3% thr4% {thr5% thr6% thr7% thr8%}
Configures the receive-queue tail-drop threshold
percentages.
Router(config-if)# no rcv-queue threshold
[queue_id]
Reverts to the default receive-queue tail-drop threshold
percentages.
Step 3
Router(config-if)# end
Exits configuration mode.
Step 4
Router# show queueing interface {fastethernet |
gigabitethernet} slot/port
Verifies the configuration.
Command Purpose
Step 1
Router(config)# interface type
1
slot/port
Selects the interface to configure.
Step 2
Router(config-if)# wrr-queue random-detect
min-threshold queue_id thr1% [thr2%]
Configures the low WRED-drop thresholds.
Router(config-if)# no wrr-queue random-detect
min-threshold [queue_id]
Reverts to the default low WRED-drop thresholds.