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EIGRP routers keep route and topology information readily available in
RAM so they can react quickly to changes. Like OSPF, EIGRP keeps this
information in several tables, or databases. The following terms are
related to EIGRP and its tables and are used throughout this module:
- Neighbor table – Each EIGRP router maintains a neighbor
table that lists adjacent routers. This table is comparable to the
adjacency database used by OSPF. There is a neighbor table for each
protocol that EIGRP supports.
- Topology table – Every EIGRP router maintains a topology
table for each configured network protocol. This table includes
route entries for all destinations that the router has learned. All
learned routes to a destination are maintained in the topology
table.
- Routing table – EIGRP chooses the best routes to a
destination from the topology table and places these routes in the
routing table. Each EIGRP router maintains a routing table for each
network protocol.
- Successor – A successor is a route selected as the
primary route to use to reach a destination. Successors are the
entries kept in the routing table. Multiple successors for a
destination can be retained in the routing table.
- Feasible successor – A feasible successor is a backup
route. These routes are selected at the same time the successors are
identified, but are kept in the topology table. Multiple feasible
successors for a destination can be retained in the topology table.
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Interactive Media Activity
Matching: EIGRP Terminology
Upon completion of this activity, the student will be able to
identify the EIGRP terminology.

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