Understanding Frame-Relay Subnet Requirements

To start know that frame-relay can be configured with one subnet between all routers in the frame relay cloud or one subnet per PVC (Private Virtual Circuit). We will now cover when a single subnet is used vs multiple subnets.

Full Mesh Network

When the frame relay network is configured in a full mesh, meaning every router is connected to every other router in the network much like a LAN, frame relay is configured with a single subnet. For example if the subnet was used, R1 could be, R2, and R3 and so on. 

Partial Mesh Network

Much like a hub and spoke network a partial network must use different subnets between each pair of routers for frame relay. Example would be the network between R1 & R2 configured with network and R1 to R3 configured with

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