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What is Priority Control ?

Module by: Jones Kalunga. E-mail the author

Definition 1: Priority Control
The need for police action occurs in an ATM network when traffic flow exceeds the negotiated rate (in the traffic contract) and the buffer overflows. Each ATM cell header has a CLP (Cell Loss Priority) bit used to identify cells as either conforming (to the contract) or nonconforming. If cells are nonconforming - for example, more cells than the contract allows - the ATM switch sets the CLP bit to one. This cell can now be transferred through the network only if there is sufficient network capacity. If there is not enough bandwidth available, the nonconforming cell is discarded and may need to be retransmitted [1]. This process is known as Priority Control.


  1. Mark Juliano. ATM Traffic Contro., (Wikipedia2006a last accessed 13 Febraury 2006).

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