This MIB module is used for configuring ATM Capable Switch to be aware of VSI Controller information. Terminolgies used: VSI - Virtual Switch Interface, a hardware-independent switch control protocol. This allows a Switch(node) to be controlled by a multiple controllers such as PNNI,LSC. These control planes can be internal or external to the switch.The VSI interface defines the messages and associated functions which allow communication between the controller and the switch.This interface is expected to support all types of connections (voice,data,frame relay,ATM) for PVCs, SPVCs and SVCs. VSI Master - software component which requests connections and receives switch generic information. This controls one or more VSI Slaves. This may run on the switch or a dedicated controller platform. This is the master module.It performs the interface to the higher layer networking software and handles all VSI related functions. VSI Slave - software component which converts generic connection requests into hardware specific requests and hardware specific information into generic information. This runs on the switch.a A centralized slave has a single point of control for making connections and controlling interfaces, while a distributed slave allows for multiple slaves to coexist on the same switch. Controller - Software ( and possibly hardware) which manages topology and network resources and performs VSI Master fucntion. This performs source routing for ent-to-end SVCs, including general call acceptance GCAC,setup calls with other controllers. PNNI and MPLS are examples for the Controller. Controller Shelf - A controller shelf is a switch containing atleast one VSI Controller which is controlling a different switch.It will also, typically, contain 'local' controllers for itself.