Editing Enhanced Interior Gateway Routing Protocol (section)

{{Short description|Internet protocol}}
'''Enhanced Interior Gateway Routing Protocol''' ('''EIGRP''') is an advanced [[distance-vector routing protocol]] that is used on a [[computer network]] for automating [[routing]] decisions and configuration. The protocol was designed by [[Cisco Systems]] as a proprietary protocol, available only on Cisco routers. In 2013, Cisco permitted other vendors to freely implement a limited version of EIGRP with some of its associated features such as High Availability (HA), while withholding other EIGRP features such as EIGRP stub, needed for [[DMVPN]] and large-scale campus deployment. Information needed for implementation was published with informational status as {{IETF RFC|7868}} in 2016, which did not advance to Internet Standards Track level, and allowed Cisco to retain control of the EIGRP protocol.<ref name=":0">{{Cite web |title=Enhanced Interior Gateway Routing Protocol (EIGRP) |url=https://www.cisco.com/c/en/us/products/ios-nx-os-software/enhanced-interior-gateway-routing-protocol-eigrp/index.html |url-status=usurped |archive-url=https://web.archive.org/web/20130221030327/https://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6554/ps6599/ps6630/qa_C67-726299.html |archive-date=2013-02-21 |access-date=2022-09-02 |website=Cisco |language=en}}</ref><ref>{{Cite web |last=Burke |first=Anthony |date=2013-01-31 |title=Why Is Cisco Bothering with "Open" EIGRP? - Packet Pushers |url=https://packetpushers.net/why-is-cisco-bothering-with-open-eigrp/ |access-date=2024-11-09 |website=packetpushers.net}}</ref>

EIGRP is used on a [[router (computing)|router]] to share routes with other routers within the same [[Autonomous System (Internet)|autonomous system]]. Unlike other well known routing protocols, such as [[routing information protocol|RIP]], EIGRP only sends [[Incremental computing|incremental updates]], reducing the workload on the router and the amount of data that needs to be transmitted.

EIGRP replaced the [[Interior Gateway Routing Protocol]] (IGRP) in 1993. One of the major reasons for this was the change to [[Classless Inter-Domain Routing|classless]] [[IPv4 addresses]] in the [[Internet Protocol]], which IGRP could not support.