CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

Seeding the EIGRP Topology Table

Before a router can send EIGRP topology information to a neighbor, that router must have some topology data in its topology table. Routers can, of course, learn about subnets and the associated topology data from neighboring routers. However, to get the process started, each EIGRP router needs to add topology data for some prefixes so that it can then advertise these routes to its EIGRP neighbors. A router’s EIGRP process adds subnets to its local topology table, without learning the topology data from an EIGRP neighbor, from three sources:

Prefixes of connected subnets for interfaces on which EIGRP has been ...