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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 42 Configuring PFC QoS
Configuring PFC QoS
When you configure multiple-threshold standard queues, note the following information:
• The first percentage that you enter sets the lowest-priority threshold.
• The second percentage that you enter sets the next highest-priority threshold.
• The last percentage that you enter sets the highest-priority threshold.
• The percentages range from 1 to 100. A value of 10 indicates a threshold when the buffer is
10-percent full.
• Always set highest-numbered threshold to 100 percent.
When configuring the WRED-drop thresholds, note the following information:
• Each WRED-drop threshold has a low-WRED and a high-WRED value.
• Low-WRED and high-WRED values are a percentage of the queue capacity (the range is from 1
to 100).
• The low-WRED value is the traffic level under which no traffic is dropped. The low-WRED value
must be lower than the high-WRED value.
• The high-WRED value is the traffic level above which all traffic is dropped.
• Traffic in the queue between the low- and high-WRED values has an increasing chance of being
dropped as the queue fills.
Configuring a Tail-Drop Receive Queue
These port types have only tail-drop thresholds in their receive-queues:
• 1q2t
• 1p1q4t
• 2q8t
• 1q8t
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#
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.