What functions do drop profiles have

Drop profiles have the following two functions:

-By default, AR series routers use the tail drop method and discard data packets at the end of a queue when congestion occurs. The tail drop method causes global Transmission Control Protocol (TCP) synchronization and reduces link usage. Drop profiles and the Weighted Random Early Detection (WRED) can solve this problem.
-By configuring different priority-based drop probabilities in drop profiles, you can ensure that packets with a low priority are dropped preferentially, and ensure the quality of high-priority and low-delay services.

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