What functions do drop profiles have

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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.

Other related questions:
What are functions of a WRED drop profile
The WRED drop profile has the following functions: - By default, the AR uses the tail drop mechanism. The AR discards data packets at the end of a queue when congestion occurs until the congestion problem is solved. The tail drop mechanism causes global Transmission Control Protocol (TCP) synchronization and reduces link usage. To solve the problem, configure the Weighted Random Early Detection (WRED) WRED in queues. - You can use a WRED drop profile to configure different drop probability values based on priorities so that the AR first discards low-priority packets and ensures requirements of high-priority and low-delay services.

What is the function of the WLAN QoS profile
The QoS profile defines the local priority and CAR. The WLAN QoS profile is bound to a user group. After WLAN users are authenticated successfully, the RADIUS server delivers authentication information containing the user group name to the AC. The AC delivers QoS CAR to the AP to limit STA data packets.

What functions do the U1900 SD cards have?
The U1900 SD cards have the following functions: 1. The SD card of the SCU board saves the multi-language voice files and greetings. 2. The SD card of the MTU board provides the voice mail service (VMS).

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

How to check ICMP packets on S series switches
You can check ICMP packets on S series switches (excluding the S1700) using the following method:
Ensure that at least one ICMP packet passes or arrives at the switch. Then enable the debugging of ICMP packets in the user view:
 <HUAWEI> terminal debugging
 <HUAWEI> terminal monitor
 <HUAWEI> debugging ip icmp

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