OSPF and Nonbroadcast Multi-Access Networks
Nonbroadcast multi-access (NBMA) networks, such as the one depicted in Figure A-7, pose a special problem for OSPF and DR election. On a Cisco router, these networks can be configured to act as a single broadcast interface with multiple connections.
Figure A-7. An NBMA Network as a Point-to-Multipoint Network
Because Router A is using a single multipoint interface (a Frame Relay interface using inverse ARP or frame-map configurations to separate the traffic between the permanent virtual circuits [PVCs]) when Router A broadcasts a packet, all the other routers receive it. But when Routers B or F ...
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