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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 41 Configuring PFC QoS
Configuring PFC QoS
Configuring 1q4t/2q2t Tail-Drop Threshold Percentages
On 1q4t/2q2t ports, the receive- and transmit-queue drop thresholds have this relationship:
• Receive queue 1 (standard) threshold 1 = transmit queue 1 (standard low priority) threshold 1
• Receive queue 1 (standard) threshold 2 = transmit queue 1 (standard low priority) threshold 2
• Receive queue 1 (standard) threshold 3 = transmit queue 2 (standard high priority) threshold 1
• Receive queue 1 (standard) threshold 4 = transmit queue 2 (standard high priority) threshold 2
To configure tail-drop threshold percentages for the standard receive and transmit queues on 1q4t/2q2t
LAN ports, perform this task:
When configuring the receive- and transmit-queue tail-drop thresholds, note the following information:
• You must use the transmit queue and threshold numbers.
• The queue_id is 1 for the standard low-priority queue and 2 for the standard high-priority queue.
• The percentages range from 1 to 100. A value of 10 indicates a threshold when the buffer is
10-percent full.
• Always set threshold 2 to 100 percent.
• Ethernet and Fast Ethernet 1q4t ports do not support receive-queue tail-drop thresholds.
This example shows how to configure receive queue 1/threshold 1 and transmit queue 1/threshold 1 for
Gigabit Ethernet port 2/1:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface gigabitethernet 2/1
Router(config-if)# wrr-queue threshold 1 60 100
Router(config-if)# end
Router#
This example shows how to verify the configuration:
Router# show queueing interface gigabitethernet 2/1
Transmit queues [type = 2q2t]:
<...Output Truncated...>
queue tail-drop-thresholds
--------------------------
1 60[1] 100[2]
2 40[1] 100[2]
Command Purpose
Step 1
Router(config)# interface {ethernet |
fastethernet | gigabitethernet}
slot/port
Selects the interface to configure.
Step 2
Router(config-if)# wrr-queue threshold
queue_id
thr1% thr2%
Configures the receive- and transmit-queue tail-drop
thresholds.
Router(config-if)# no wrr-queue threshold
[
queue_id
]
Reverts to the default receive- and transmit-queue
tail-drop thresholds.
Step 3
Router(config-if)# end
Exits configuration mode.
Step 4
Router# show queueing interface {ethernet |
fastethernet | gigabitethernet}
slot/port
Verifies the configuration.
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