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

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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.

Other related questions:
Precautions for quintuple packet discard statistics configuration on the USG6000 series
Quintuple packet discard statistics affect device performance. Use it with caution. After locating network problems, stop the statistics.

Tail drop in the QoS function of the USG6000 series
Tail drop After a queue is full, the packet that arrives last is discarded.

MF classification in the QoS function of the USG6000 series
In MF classification, packets are classified elaborately based on complex rules, for example, based on the source address or destination address of IPv4 or IPv6 packets, the protocol type, or the TCP/UDP port numbers of applications. MF classification is usually performed on the border device in the Diff-Serv model.

Service models in the QoS function of the USG6000 series
In the QoS mechanism, services are provided to users in different service models based on the network quality and requirements. There are three common QoS service models: �?Best-effort service model �?Integrated service model �?Differentiated service model

BA classification in the QoS function of the USG6000 series
In BA classification, packets are classified roughly based on simple rules, for example, based on DSCP values of IPv4 packets or 802.1p values of virtual local area network (VLAN) packets. Packets with the same priority or service level are called BA. BA classification is usually performed on the core device in the Diff-Serv model.

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