Chapter 42 Configuring PFC QoS

Configuring PFC QoS

Configuring the Transmit-Queue Size Ratio

To configure the transmit-queue size ratio, perform this task:

 

Command

Purpose

Step 1

 

 

Router(config)# interface type1 slot/port

Selects the interface to configure.

Step 2

 

 

Router(config-if)#wrr-queue queue-limit

Configures the queue size ratio between transmit queues.

 

low_priority_queue_weight

 

 

 

[intermediate_priority_queue_weights]

 

 

 

high_priority_queue_weight

 

 

Step 3

 

 

Router(config-if)#priority-queue queue-limit

Configures the strict priority queue size.

 

strict_priority_queue_weight

Note

Not supported on all switching modules.

 

 

Step 4

 

 

Router(config-if)# end

Exits configuration mode.

Step 5

 

 

Router# show queueing interface type1 slot/port

Verifies the configuration.

 

 

 

 

1.type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet

When configuring the transmit-queue size ratio between transmit queues, note the following information:

•The wrr-queuequeue-limitcommand is not supported on 2q2t and 1p3q1t ports.

•For ports that have an egress strict priority queue:

–With Release 12.2(18)SXF2 and later releases, you can enter the priority-queuequeue-limitinterface command to set the size of the egress strict priority queue on these switching modules:

—WS-X6502-10GE (1p2q1t) —WS-X6148A-GE-TX (1p3q8t) —WS-X6148-RJ-45 (1p3q8t) —WS-X6148-FE-SFP (1p3q8t) —WS-X6748-SFP (1p3q8t) —WS-X6724-SFP (1p3q8t) —WS-X6748-GE-TX (1p3q8t) —WS-X6704-10GE (1p7q4t) —WS-SUP32-10GE-3B (1p3q8t) —WS-SUP32-GE-3B (1p3q8t) —WS-X6708-10GE (1p7q4t)

–With releases earlier than Release 12.2(18)SXF2 and for other modules, PFC QoS sets the egress strict-priority queue size equal to the high-priority queue size.

•Estimate the mix of low priority-to-high priority traffic on your network (for example, 80 percent low-priority traffic and 20 percent high-priority traffic).

•Use the estimated percentages as queue weights.

•You must enter weights for all the standard transmit queues on the interface (2, 3, or 7 weights).

•Valid values are from 1 to 100 percent, except on 1p2q1t egress LAN ports, where valid values for the high priority queue are from 5 to 100 percent.

 

 

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

 

 

 

 

 

 

OL-4266-08

 

 

42-111

 

 

 

 

 

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Cisco Systems OL-4266-08 Configuring the Transmit-Queue Size Ratio, Configures the strict priority queue size, 42-111
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