![]() If the high-priority queue is empty, one packet from the medium-priority queue is processed. As long as the high-priority queue has packets, the PQ scheduler forwards packets only from the high-priority queue. ![]() Access lists are often used to define which types of packets are assigned to which of the four queues. You must assign packets to one of the queues, or the packets will be assigned to the normal queue. PQ has four queues available: high-, medium-, normal-, and low-priority queues. PQ, which has been available for many years, requires configuration. On fast interfaces that are unlikely to be congested, FIFO is often considered an appropriate queuing discipline. As a result, other application packets-for example, low volume and less aggressive traffic such as voice-might be dropped or experience long delays. Without multiple queues and without a scheduling and dropping algorithm, high-volume and ill-behaved applications can fill up the FIFO queue and consume all the interface bandwidth. Packets line up in a single FIFO queue packet class, priority, and type play no role in a FIFO queue. FIFO is a simple algorithm that requires no configuration effort. Each queue within a multiqueue discipline is a FIFO queue. The hardware queue (TxQ) also processes packets based on the FIFO discipline. ![]() ![]() FIFO is the default queuing discipline in most interfaces except those at 2.048 Mbps or lower (E1). ![]()
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