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When configured, an ATM switch at the network side of a user-to-network (UNI) interface polices the flow of cells in the forward (into the network) direction of a virtual connection. These traffic policing mechanisms are known as usage parameter control (UPC). With UPC, the switch determines whether received cells comply with the negotiated traffic management values and takes one of the following actions on violating cells:
Pass the cell without changing the cell loss priority (CLP) bit in the cell header.
Tag the cell with a CLP bit value of 1.
Drop (discard) the cell.
The SVC/SoftPVC feature enables you to specify which traffic to police, based on service category, on switched virtual circuits (SVCs) or terminating VCs on the destination end of a soft VC.
If a VC is not configured with the appropriate UPC mode, make sure that the VC was set up after the atmsvc-upc-intent command was configured. Changes to the UPC mode take affect after the VC is torn down and set up again.
Monitoring and Maintaining ATM Policing by Service Category for SVC and SoftPVC
Displays ATM-specific information about an ATM interface.
Displays information about a physical port device. Includes dropped (or discarded) cells.