Question

Control message from a switch to controller in SDN is termed as

Answer 1

Hello friend,

The answer to your question is following,

Control message from a switch to controller in SDN is termed as openflow message.

These are controlled msgs sent to the network in packet data systems.

Hence the answer is open flow message.

Thanks for asking.

Answer 2

The controller is the main of an SDN network.

It lies between network devices at one end and submissions at the extra end.

Any transportations between requests and devices have to go through the controller.

The controller also uses procedures such as Open Flow to configure network devices and select the optimal  network.