Cisco 7604 Configuration Manual page 696
Ios software configuration guide
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Configuring PFC QoS
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When configuring thresholds, note the following information:
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When you configure multiple-threshold standard queues, note the following information:
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When configuring the WRED-drop thresholds, note the following information:
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Configuring a Tail-Drop Receive Queue
These port types have only tail-drop thresholds in their receive-queues:
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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
41-94
Configuring a WRED-Drop and Tail-Drop Transmit Queue, page 41-96
Configuring 1q4t/2q2t Tail-Drop Threshold Percentages, page 41-98
Enter the show queueing interface {ethernet | fastethernet | gigabitethernet |
tengigabitethernet} slot/port | include type command to see the queue structure of a port.
1p1q0t ports have no configurable thresholds.
1p3q1t (transmit), 1p2q1t (transmit), and 1p1q8t (receive) ports also have nonconfigurable
tail-drop thresholds.
Queue number 1 is the lowest-priority standard queue.
Higher-numbered queues are higher priority standard queues.
Receive-queue parameters can be configured only on trusted ports.
When configuring minimum and maximum threshold values, you cannot configure minimum values
to be larger than maximumvalues.
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.
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.
1q2t
1p1q4t
2q8t
1q8t
Chapter 41
Configuring PFC QoS
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