| Term | Definition |
|---|
| Enhanced IGRP (EIGRP) | classless, enhanced/advanced distance-vector protocol; hybrid routing protocol |
| Enhanced IGRP (EIGRP) | includes the subnet mask in its route updates; allows Variable Length Subnet Masks (VLSMs) |
| Enhanced IGRP (EIGRP) | suitable for very large networks |
| Enhanced IGRP (EIGRP) | Support for IP and IPv6; Support for summaries and discontiguous networks; Efficient neighbor discovery; Communication via Reliable Transport Protocol (RTP); Best path selection via Diffusing Update Algorithm (DUAL) |
| Enhanced IGRP (EIGRP) | supports different Network layer protocols through the use of protocol-dependent modules (PDMs); maintains a separate series of tables containing the routing information that applies to a specific protocol |
| Feasible distance | the best metric along all paths to a remote network |
| Reported/advertised distance | the metric of a remote network, as reported by a neighbor |
| Neighbor table | When a newly discovered neighbor is learned, the address and interface of the neighbor are recorded |
| Topology table | populated by the protocol-dependent modules and acted upon by the Diffusing Update Algorithm (DUAL) |
| Feasible successor | a path whose reported distance is less than the feasible distance, and it is considered a backup route |
| Successor | the best route to a remote network; used by EIGRP to forward traffic to a destination and is stored in the routing table |
| Topology table | contains all destinations advertised by neighboring routers, holding each destination address and a list of neighbors that have advertised the destination |
| show ip eigrp topology | display all EIGRP feasible successor routes known to a router |
| Reliable Transport Protocol (RTP) | proprietary protocol used to manage the communication of messages between EIGRP-speaking routers |
| Enhanced IGRP (EIGRP) | uses the Class D address 224.0.0.10 to send multicast traffic |
| reliable multicast | 1 Multicast > 16 Unicast > if no reply, the router is dead |
| Diffusing Update Algorithm (DUAL) | Backup route determination; Support of VLSMs; Dynamic route recoveries; Queries for an alternate route if no route can be found |
| internal EIGRP route | routes originated within a specific autonomous system by EIGRP routers that are members of the same autonomous system |
| external EIGRP route | networks that originated outside of the EIGRP autonomous system |
| Enhanced IGRP (EIGRP) | automatic redistribution |
| Enhanced IGRP (EIGRP) | multiple autonomous system |
| Enhanced IGRP (EIGRP) | supports the use of discontiguous subnets |
| Neighborship/neighbor table | records information about routers with whom neighborship relationships have been formed |
| Topology table | stores the route advertisements about every route in the internetwork received from each neighbor |
| Route table | stores the routes that are currently used to make routing decisions |
| EIGRP Metrics | bandwidth, delay, load, reliability, and maximum transmission unit (MTU) |
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