Why does an S series switch properly transmit small ping packets but discard large ping packets

A small MTU value on an interface of an S series switch may make the switch properly transmit small ping packets and discard large ping packets. You can run the ping -f command to measure the maximum packet length supported by the interface, and then check the MTU value on the interface.
The ping command uses ICMP packets. The packet size in the ping command output is the payload length of ICMP packets, excluding the length of the IP and ICMP packet headers. The length of the IP packet header is 20 bytes and that of the ICMP packet header is 8 bytes.

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