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