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Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced distance-vector routing protocol that is used on a computer network to help automate routing decisions and configuration. The protocol was designed by Cisco Systems as a proprietary protocol, available only on Cisco routers. Partial functionality of EIGRP was converted to an open standard in 2013,〔Cisco Systems (2013), (Enhanced Interior Gateway Routing Protocol (EIGRP) Informational RFC Frequently Asked Questions ), retrieved 14 September 2013〕 is available as an IETF draft.〔IETF (2015), (Enhanced Interior Gateway Routing Protocol draft-savage-eigrp-04 )〕 The latest draft version has been submitted for RFC assignment process and has completed the IETF conflict review. 〔IETF (2015), (IETF conflict review for draft-savage-eigrp )〕 EIGRP is used on a router to share routes with other routers within the same autonomous system. Unlike other well known routing protocols, such as RIP, EIGRP only sends incremental updates, reducing the workload on the router and the amount of data that needs to be transmitted. == Overview == The Enhanced Interior Gateway Routing Protocol is instead of Interior Gateway Routing Protocol (IGRP) in 1993.〔(IGRP and EIGRP | Difference Between | IGRP vs EIGRP ). Difference Between (2011-05-19). Retrieved on 2014-05-30.〕 One of the major reasons for this was because the design of the Internet Protocol had been changed to support classless IPv4 addresses, which IGRP could not support.〔 Almost all routers contain a routing table that contains rules by which traffic is forwarded in a network. If the router does not contain a valid path to the destination, the traffic is discarded. EIGRP is a dynamic routing protocol by which routers automatically share route information. This eases the workload on a network administrator who does not have to configure changes to the routing table manually. In addition to the routing table, EIGRP uses the following tables to store information: *Neighbor Table: The neighbor table keeps a record of the IP addresses of routers that have a direct physical connection with this router. Routers that are connected to this router indirectly, through another router are not recorded in this table as they are not considered neighbors. *Topology Table: The topology table stores routes that it has learned from neighbor routing tables. Unlike a routing table, the topology table does not store all routes, but only routes that have been determined by EIGRP. The topology table also records the metrics for each of the listed EIGRP routes, the feasible successor and the successors. Routes in the topology table are marked as "passive" or "active". Passive indicates that EIGRP has determined the path for the specific route and has finished processing. Active indicates that EIGRP is still trying to calculate the best path for the specific route. Routes in the topology table are not usable by the router until they are inserted into the routing table. The topology table is never used by the router to forward traffic. Routes in the topology table will not be inserted into the routing table if they are active, are a feasible successor, or have a higher administrative distance than an equivalent path.〔 Information in the topology table may be inserted into the router's routing table and can then be used to forward traffic. If the network changes, for example, a physical link fails or is disconnected, the path will become unavailable. EIGRP is designed to detect these changes and will attempt to find a new path to the destination. The old path that is no longer available is removed from the routing table. Unlike most distance vector routing protocols, EIGRP does not transmit all the data in the router's routing table when a change is made but will only transmit the changes that have been made since the routing table was last updated. EIGRP does not send its routing table periodically, but will only send routing table data when an actual change has occurred. This behavior is more inline with link-state routing protocols, thus EIGRP is mostly considered a hybrid protocol. When a router running EIGRP is connected to another router also running EIGRP, information is exchanged between the two routers and a relationship is formed known as an adjacency. The entire routing table is exchanged between both routers at this time. After this has occurred, only differential changes are sent. EIGRP is often considered a hybrid protocol because it is also sends link state updates when link states change. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Enhanced Interior Gateway Routing Protocol」の詳細全文を読む スポンサード リンク
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