When a switch receives a modify request message from the controller to modify the state of a group or meter entries, after successful modification of the state, the switch should forward this request message to all other controllers as request forward messages (OFPT_REQUESTFORWAD
). The switch sends this message only to the controller channel wherein the controller requested the switch to send it.
If the controller wants to receive request forward messages from the switch, then it should configure the switch accordingly. Refer to the Sending a switch configuration message to the switch of Chapter 1, OpenFlow Channel Connection Establishment (Part 2), for the procedure to configure the switch to send a request forward message.
The message format that will be used by the switch to send the OFPT_REQUESTFORWAD
message is defined in the Sending a request-forward message to the controller recipe of Chapter 2, Symmetric...