交换机基于FIFO(先进先出)传输网络通信的传统排队方法现已不能胜任其角色了。网络管理人员正急需一种更为智能化的网络通信优化方案,答案可能就是PFQ(按信息流排队)。使用先进先出方案时,信息包在每个端口被置于一个缓冲队列中,但未确定优先等级。这样,重要信息就可能会被阻挡在不太紧急的信息包之后。尽管FIFO有它的局限性,但是一些交换机生产厂商通过采用每端口多个队列的方法提供了确定优先次序的方法。每一队列都被指定一个优先等级。随后,交换机先发送较高等级队列中的数据包,然后再发送位干较低等级队列中的数据包。 Traditional queuing methods for switch-based FIFO (first-in, first-out) transport network traffic are no longer sufficient for their role. Network managers are in urgent need of a more intelligent network communication optimization program, the answer may be PFQ (according to flow of information queue). When using a first-in-first-out scheme, packets are placed in a buffer queue on each port, but the priority level is not determined. In this way, important information may be blocked behind less urgent packets. Although FIFOs have their limitations, some switch manufacturers provide a prioritized approach by using multiple queues per port. Each queue is assigned a priority. The switch then sends the packets in the higher-level queue before sending the packets in the lower-level queue.