Frame Relay Layer Different Addressing

Frame Relay operates at Layer 2 of the OSI model, which means it uses Data Link Layer addressing. Frame Relay uses two types of addressing: Data Link Connection Identifier (DLCI) and Network Service Access Point (NSAP).

DLCI is used to identify a specific virtual circuit in a Frame Relay network. It is a local identifier assigned by the service provider to each virtual circuit, and it is used by the Frame Relay switch to forward traffic to the appropriate destination.

NSAP is a globally unique address used to identify a Frame Relay network. It is assigned by the International Telecommunication Union (ITU) and consists of an area address, system ID, and a selector field. NSAP addressing is used for interconnecting different Frame Relay networks.