CBWFQ class-default queue

So, all queuing tools(PQ, CQ) support FIFO logic inside a single queue. But CBWFQ can use either FIFO or WFQ inside the class-default queue.

Note: 7500 router support FIFO or WFQ inside each and every CBWFQ queue..


When WRED enabled directly on physical interface, IOS support FIFO queueing only.

Only CBWFQ and LLQ can use WRED..