VP and VC labels
Concept of hop-by-hop labelling
# VP and VC are labeled with integer identifies
- virtual path identifier (vpi)
- virtual channel identifier (vci)
# vpi/vci are assigned hop by hop
# same end-to-end ATM connection may have different vpi/vci indifferent hop
# hop-by-hop label assignment allow reuse of the same number at different hops
# the network maps vpi/vci at adjacent hop to create an end-to-end virtual circuit