6.8.16. Administrative Control

There may be circumstances where it is desirable to administratively enable or disable a BFD session. When this is desired, the following procedure MUST be followed:

If enabling session
    Set bfd.SessionState to Down

Else
    Set bfd.SessionState to AdminDown
    Set bfd.LocalDiag to an appropriate value
    Cease the transmission of BFD Echo packets

If signaling is received from outside BFD that the underlying path has failed, an implementation MAY administratively disable the session with the diagnostic Path Down.

Other scenarios MAY use the diagnostic Administratively Down.

BFD Control packets SHOULD be transmitted for at least a Detection Time after transitioning to AdminDown state in order to ensure that the remote system is aware of the state change. BFD Control packets MAY be transmitted indefinitely after transitioning to AdminDown state in order to maintain session state in each system (see section 6.8.18 below).