3.5.d Implement and troubleshoot operations

3.5.d [i] General operations

The following are the most common causes of problems with EIGRP neighbor relationships:

● Unidirectional link

● Uncommon subnet, primary, and secondary address mismatch

● Mismatched masks

● K value mismatches

● Mismatched AS numbers

● Stuck in active

● Layer 2 problem

● Access list denying multicast packets

● Manual change (summary router, metric change, route filter)

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 3143-3154).  . Kindle Edition.