Routing Protocols and Partial Mesh Technologies

Each router in Figure 3-7 only has one physical interface, which connects to the Frame Relay network. The Frame Relay interface on Router A has two permanent virtual circuits (PVCs) configured through one interface: one to Router B, and the other to Router C. Routers B and C each connect to one PVC. Each router sees this Frame Relay cloud as a logical subnet. Frame Relay, ATM, and Primary Rate ISDN

interfaces typically provide this type of connectivity, called point-to-multipoint or nonbroadcast multi-access (NBMA).

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