It is important to understand that simply enabling EIGRP between two or more routers does not guarantee that a neighbour relationship will be established. In addition to certain parameters-matching, additional factors can also result in a failure of EIGRP neighbour relationship establishment. The EIGRP neighbour relationship may not establish due to any of the following:
- The neighbour routers are not on a common subnet
- Mismatched primary and secondary subnets
- Mismatched K values
- Mismatched ASN
- Access control lists are filtering EIGRP packets
- Physical Layer issues
- Data . . .
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