What is the AD for Internal EIGRP routes?

The administrative distance (AD) for Internal EIGRP (Enhanced Interior Gateway Routing Protocol) routes is 90. Administrative distance is a value that routers use to rank the trustworthiness of the routing information received from various routes and routing protocols.

EIGRP's internal routes are those learned from the same AS (Autonomous System) of the router, and this particular value of 90 indicates a high level of reliability for the routes learned via EIGRP compared to other routing protocols. This means that when a router has multiple routes to a destination from different routing sources, it will prefer EIGRP routes over those learned from protocols with a higher administrative distance (like OSPF, which has an AD of 110, or RIP, which has an AD of 120). Hence, if EIGRP internal routes are available, the router will choose them as the best path to the destination due to their lower AD.

This understanding is essential when configuring and troubleshooting routing protocols within a network, as it highlights the hierarchy of trustworthiness that routers apply to incoming routing information.