CLP (1 bit)

Protocol: ATM ATM PCI (Cell Layer)

Field: cell loss priority

Length: 1 bit

Contents: indicates if cell may be discarded.

If an ATM switch (or cross connect) suffers from congestion, it will discard cells marked with CLP=1 first.

The CLP bit is set by ATM network access nodes at the UNI in case that a source station exceeds its CIR in order to mark the overhead cells.

This is called usage parameter control.