There are instances where you might notice that EIGRP is not installing certain routes into the routing table. For the most part, this is typically due to some misconfigurations versus a protocol failure. Some common reasons for route installation failure include the following:
- The same route is received via another protocol with a lower administrative distance
- EIGRP summarisation
- Duplicate router IDs are present within the EIGRP domain
- The routes do not meet the Feasibility Condition
The administrative distance (AD) concept is used to determine how reliable the route source is . . .
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