The CLP can be set to 1:

A.
By the Network Management Station

B.
By the switch to inform the ATM network that this cell is not conforming and MUST be discarded.

C.
By the switch to inform the end user that it is sending too much data.

D.
By the switch to inform the ATM network that this cell is not conforming and MAY be discarded.

E.
By the CPE to tell the switch that this cell has lower priority.