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C-4 APPENDIX C: ATM AND VLAN MANAGEMENT BASICS
cell with a given connection, and therefore it can be routed to the right
destination. Identical VPI/VCI combinations may exist on different
interfaces.
The VPI is a bundle of VCs. Individual VCs have unique VCI values, but the
VCI values may be reused in each VP.
Figure C-1 Virtual Path/Channels Connections
Two levels of virtual channels are supported at the UNI:
■ A Virtual Channel Connection (VCC) that consists of a single
connection established between two ATM end-points.
■ A Virtual Path Connection (VPC) that consists of a bundle of VCCs
carried transparently between two ATM end-points.
Connections can be established via management (Permanent Virtual
Channels) or dynamically (Switched Virtual Channels).
Permanent Virtual Channels (PVCs) This most basic connection
setup requires the definition of each connection by management (for