Neighborship over Frame Relay Point-to-Point Subinterfaces

Frame Relay design allows several options for IP addressing and subnetting. One option treats each pair of routers on the ends of each PVC as a point-to-point topology, with one subnet assigned to each pair of routers. Another option treats more than two routers as a group, whether connected with a full mesh or partial mesh of PVCs, with a single subnet assigned to that group.

Many Frame Relay designs use the first option, treating each pair of routers on the ends of a PVC as a single subnet, as shown in Figure 7-6. In such cases, it makes sense to treat each PVC as a separate point-to-point connection, assigning a single subnet (at Layer 3) to each Layer 2 PVC.

Figure 7-6 Hub-and-Spoke ...

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