- The neighbour routers are not on a common subnet; mismatched primary and secondary subnets; mismatched K values; mismatched ASN; ACLs are filtering EIGRP packets; Physical Layer issues; Data Link Layer issues; and mismatched authentication parameters.
- The show ip protocols command.
- The show ip eigrp traffic command.
- The same route is received via another protocol with a lower administrative distance; EIGRP summarisation; duplicate router IDs are present within the EIGRP domain; and the routes do not meet the Feasibility Condition.
- True.
- True.
- The debug eigrp fsm command.
- The show ip eigrp topology x.x.x.x y.y.y.y command.
- The show ip eigrp events command.
- The debug ip routing command.