Common packet discarding policies in the QoS function of the USG6000 series

Common discarding policies are listed as follows:
�?Tail drop
After a queue is full, the packet that arrives last is discarded.
�?Random early detection (RED)
In the RED algorithm, packets are discarded randomly after the queue reaches the specified length. RED can avoid global synchronization induced by the slow start mechanism of Transmission Control Protocol (TCP).
�?Weighted random early detection (WRED)
Compared with RED, WRED takes into account the queue length and packet priorities when discarding packets. A packet with a lower priority is discarded earlier with a higher probability.

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