在发生拥塞期间，优先级队列不能使用任何超额的带宽。
During congestion conditions, a priority class cannot use any excess bandwidth.
在极端情况下，低优先级队列几乎不会处理并且本配不到一点带宽。
In extreme cases, the lower priority queues rarely were serviced and effectively were starved of bandwidth.
每个队列都有优先级和指定的带宽。
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