Neighbor Requirements in EIGRP

1. Routers must be able to send IP packets to each other (duh!)
2. Interface primary address must be in the same subnet on neighboring routers
3. Must not be passive on connected interfaces
4. Must use the same Autonomous System Number on the "router" configuration command
5. hello intervals, hello timers and hold timers do not need to match
6. Must pass router authentication
7. IP MTU does not need to match
8. K-values *must* match
9. Router ID does not need to be unique, however - duplicate RIDs may cause problems when configuring external EIGRP