6.8.14. Enabling or Disabling Demand Mode
If it is desired to start or stop Demand mode, this MAY be done at any time by setting bfd.DemandMode to the proper value. Demand mode will subsequently become active under the rules described in section 6.6.
If Demand mode is no longer active on the remote system, the local system MUST begin transmitting periodic BFD Control packets as described in section 6.8.7.