Dhruv Dhody <dhruv.dhody@xxxxxxxxxx> writes: > [[Dhruv Dhody]] I have added this in the backward compatibility session to note this concern - > > Note that, a PCEP implementation that support PCEPS would respond > with PCErr message with Error-Type set to [TBA2 by IANA] (PCEP > StartTLS failure) and Error-value set to 2 if any other message is > sent before StartTLS or Open. If the sender of the invalid message > is a PCEP implementation that does not support PCEPS, it will not be > able to understand this error. A PCEPS implementation could also > send the PCErr message as per [RFC5440] with Error-Type "PCEP session > establishment failure" and Error-value "reception of an invalid Open > message or a non Open message" before closing the session. You are, of course, the author. But my opinion is that you'd get cleaner compatibility by sending a 1/1 error in this situation. Dale