VPI: Virtual Path Identifier
Full Form of VPI or VPI stands for Virtual Path Identifier. It is an 8-bit field in the header of an ATM cell. It acts as a data communication identifier that establishes a virtual network path for an asynchronous transfer mode.
What does VPI mean?
Virtual Path Identifier (VPI) refers to an 8-bit (user-to-network cells) or 12-bit (network-network cells) field within the header of an Asynchronous Transfer Mode (ATM) cell. The VPI, together with the Virtual Channel Identifier (VCI) is used to identify the next destination of a cell as iteries of ATM switches on its way to its destination.
ATM cells generally pass through ATM switches. VPI tells the switches about the route of cell as the cell travels through the ATM network. Generally, the VPI is used with VCI to identify the route or destination of the cell. The function of VPI is similar to the function of DLCI in Frame Relay.
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