内置策略器（built-in policer）用来保证其他队列由排队调度程序进行处理。
The purpose of the built-in policer is to ensure that the other queues are serviced by the queueing scheduler.
在原先的Cisco优先级队列特性中，使用priority - group和priority - list命令，排队调度程序总是先处理最高优先级的队列。
In the original Cisco priority queueing feature, which USES the priority-group and priority-list commands, the scheduler always serviced the highest priority queue first.
如果服务速率低于新工作的到达速率，则服务器将会跟不上，在有托管任务可对其进行调度前，新工作都将排队等候。
If the service rate drops below the arrival rate of new work, the server falls behind and new work is queued up until a managed task becomes available to dispatch it.
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