What is the AD for External EIGRP routes?

In EIGRP (Enhanced Interior Gateway Routing Protocol), the Administrative Distance (AD) is a value that routers use to prioritize routes learned from different routing protocols. The AD for External EIGRP routes is set to 170.

External EIGRP routes are those learned from other routing protocols that are redistributed into EIGRP. This is important for maintaining routing consistency when integrating different network segments or protocols, such as OSPF or RIP, into an EIGRP environment. Since external routes are generally considered less reliable than internal EIGRP routes, which have an AD of 90, the value of 170 represents a suitable compromise, allowing for the propagation of external routes while still prioritizing internal EIGRP routes.

Recognizing the AD values for various routing protocols helps in troubleshooting routing issues and optimizing routing decisions within a network.