EIGRP - Static neighbors over any L2 technology
When configuring an EIGRP topology, it is possible to statically configure neighbors. This can be done using the following commands on each end of the adjacency:
R1(config)#router eigrp 12 R1(config-router)#neighbor 192.168.12.2 GigabitEthernet 0/0
When you apply such a configuration, the EIGRP messages sent between the devices are sent using unicast communication regardless of the underlying Layer 2 technology, whether it is a point to point technology such as a serial link between two devices, a non broadcast technology such as frame relay, or a broadcast multiaccess technology such as Ethernet.