Port speed limit and port flow control

Port speed limit:

Refers to the rate at which the port is throttled to a speed limit value.

Port Flow control:

On the basis of the port speed limit, if the port has the flow control function, you can control the packet rate to the speed limit value.

Example:

Port 1 Speed limit 10M, to the port 100M rate, port speed limit function, the packet rate is still 100M, the port rate is 10M.

Port 1 Speed limit 10M, and the port has a flow control function. The rate at which the packet is sent to Port 1 drops to 10M, the port 1 rate is 10M, and the port receives a stream control frame.

The port speed limit is generally for man-made purposes, through the port speed limit to avoid communication congestion. is a preventive mechanism.
In the port of the switch, there are registers that are used to count and can be set up to reach the port speed limit.
Flow control is generally the function of the switch itself, in order to avoid the buffer overflow frame loss, and through a series of mechanisms to avoid.
Full duplex is usually done by sending a Mac control frame (pause frame).
In a half-duplex network, it is generally implemented by forcing collisions and pseudo-carrier signals.