Cisco 6500 Series Software Configuration Manual page 448

Configuring PFC QoS
This example shows how to verify the configuration:
Router# show queueing interface gigabitethernet 1/1 | begin Transmit queues
Transmit queues [type = 1p2q2t]:
<...Output Truncated...>
Router#
Configuring 1q4t/2q2t Tail-Drop Threshold Percentages
On 1q4t/2q2t ports, the receive- and transmit-queue drop thresholds have this relationship:
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To configure tail-drop threshold percentages for the standard receive and transmit queues on 1q4t/2q2t
LAN ports, perform this task:
Command
Step 1
Router(config)# interface {ethernet |
fastethernet | gigabitethernet} slot/port
Step 2
Router(config-if)# wrr-queue threshold queue_id
thr1% thr2%
Router(config-if)# no wrr-queue threshold
[queue_id]
Step 3
Router(config-if)# end
Step 4
Router# show queueing interface {ethernet |
fastethernet | gigabitethernet} slot/port
When configuring the receive- and transmit-queue tail-drop thresholds, note the following:
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Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
31-58
Queue Id Scheduling
-----------------------------------------
1 WRR low
2 WRR high
3 Priority
queue random-detect-max-thresholds
----------------------------------
1 40[1] 70[2]
2 40[1] 70[2]
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
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.
Num of thresholds
2
2
1
Purpose
Selects the interface to configure.
Configures the receive- and transmit-queue tail-drop
thresholds.
Reverts to the default receive- and transmit-queue
tail-drop thresholds.
Exits configuration mode.
Verifies the configuration.
Chapter 31 Configuring PFC QoS
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