3Com 10014299 Displaying and debugging the custom-list queue, Configuring Weighted fair queuing

692CHAPTER 49: CONGESTION MANAGEMENT

byte-count: When the router dispatches the user queue of CQ, it continuously extracts and sends the data packets from this queue, until the number of the transmitted bytes is not less than the byte-countvalue configured for this queue or the queue is empty, the next user queue of CQ is to be transmitted. Therefore, the byte-countvalue will affect the proportional relationship of the occupied interface bandwidth between various user queues of CQ, and determine how long the router will dispatch the next queue of CQ.

If the byte-countvalue is too small, the router will go to the next queue after at least one data packet is transmitted, and the bandwidths allocated to various queues may be far from the expected result. If the byte-countis too large, it may cause the too long delay of the switching between the queues.

Displaying and debugging the custom-list queue

Table 735 Display and Debug the Custom-List Queue

Operation	Command
Display the custom queue configuration	display qos cql [ interface type
conditions and statistic information of the	number ]
interface
Display the content of the custom list.	display qos cql

Configuring WFQ To configure weighted fair queuing, perform the following configurations in the interface view.:

■Configuring Weighted fair queuing

■Displaying and debugging the weighted fair queue

Configuring Weighted fair queuing

Table 736 Configure Weighted Fair Queuing

Operation	Command
Configure the weighted fair queuing	qos wfq [ queue-length
	max-queue-length [ queue-number
	total-queue-number ] ]
Recover the default queue congestion	undo qos wfq
management policy of the interface

By default, the adopted congestion management policy is FIFO.

By default, max-queue-lengthis 64 packets. discard-thresholdcan range from 1 to 1024 packets. total-queue-numberis 256 dynamic queues by default. It can be the following values: 16, 32, 64, 128, 256, 512, 1024, 2048 and 4096.

Displaying and debugging the weighted fair queue

Table 737 Display and Debug the Weighted Fair Queue

Operation	Command
Display the custom-list queue	display qos wfq [ interface type
configuration conditions and statistic	number ]
information of the interface