?– Easy summarization: EIGRP enables administrators to create summary routes anywhere
within the network rather than rely on the traditional distance vector approach of performing
classful route summarization only at major network boundaries.
Each EIGRP router maintains a neighbor table. This table includes a list of directly connected
EIGRP routers that have an adjacency with this router.
Each EIGRP router maintains a topology table for each routed protocol con?¬?guration. The
topology table includes route entries for every destination that the router learns. EIGRP chooses
the best routes to a destination from the topology table and places these routes in the routing table,
as illustrated in Figure 5-1.
Figure 5-1 EIGRP Tables
IP EIGRP Neighbor Table
Next-Hop Router Interface
The IP Routing Table
Destination 1 Interface
IP EIGRP Topology Table
Destination 1 Interface
List of All Routes Learned
from Each EIGRP Neighbor
List of All Best Routes from
EIGRP Topology Table and
the Other Routing Processes
List of Directly Connected
Routers Running EIGRP
Implementing EIGRP 173
In EIGRP, the best route is called a successor route while a backup route is called the feasible
successor.
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