EIGRP (Enhanced Interior Gateway Routing Protocol) EIGRP is a Cisco-proprietary Hybrid routing protocol, incorporating features of both Distance-Vector and Link-State routing protocols. EIGRP adheres to the following Hybrid characteristics: • EIGRP uses Diffusing Update Algorithm (DUAL) to determine the best path among all “feasible” paths. DUAL also helps ensure a loop-free routing environment. • EIGRP will form neighbor relationships with adjacent routers in the same Autonomous System (AS). • EIGRP traffic is either sent as unicasts, or as multicasts on address 224.0.0.10, depending on the EIGRP packet type. • Reliable Transport Protocol (RTP) is used to ensure delivery of most EIGRP packets. • EIGRP routers do not send periodic, full-table routing updates. Updates are sent when a change occurs, and include only the change. • EIGRP is a classless protocol, and thus supports VLSMs. Other characteristics of EIGRP include: • EIGRP supports IP, IPX, and Appletalk routing. • EIGRP applies an Administrative Distance of 90 for routes originating within the local Autonomous System. • EIGRP applies an Administrative Distance of 170 for external routes coming from outside the local Autonomous System • EIGRP uses Bandwidth and Delay of the Line, by default, to calculate its distance metric. It also supports three other parameters to calculate its metric: Reliability, Load, and MTU. • EIGRP has a maximum hop-count of 224, though the default maximum hop-count is set to 100. For more information, check out EIGRP Configuration in Packet Tracer Comments are closed.
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