Configuring Bandwidth over a Multipoint Network

The configuration of the bandwidth command in an NBMA cloud depends on the design of the VCs. If the serial line has many VCs in a multipoint configuration, then EIGRP will evenly distribute its overhead between the VCs, without the use of subinterfaces. The bandwidth command should therefore reflect the access link speed into the Frame Relay cloud. If the serial interface is accessing an NBMA environment such as Frame Relay, the situation is straightforward. Your company may have five VCs from your router's serial interface. Each VC is 56 kbps. The access link will need a capacity of 5 x 56 kbps, or at least 2046 kbps. Remember, the aggregate configured bandwidth cannot exceed the access speed of the interface.

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