Activation and Deactivation Cells

To enable and disable CC cell flows, ATM OAM uses activation and deactivation cells:

To enable a CC cell flow, the router sends activation OAM cells to the peer. The peer replies with a confirmation or denial. If the CC sink point is not activated, all received CC cells are dropped. (See Activating CC Cell Flow for more details.)
To disable a CC cell flow, the router sends deactivation OAM cells to the peer. The peer replies with a confirmation or denial.