A VSI controller represents an instance of a service layer
accessible to a network control application. This object
serves to identify the type of the network control
application currently being supported by this controller.
other(1): the type is unspecified.
mpls(2): indicates that the client is a Label Switch
Controller performing Multi Protocol Label Switching.
pnni(3): indicates that the client is an instance of the
ATM Private Network to Network Interface.
par(4): indicates that the client is an instance of ATM
Portable Autoroute.