Knowledge About EIGRP
Knowledge About EIGRP
EIGRP? What is that?
1. Intriducing EIGRP
EIGRP is a Cisco-proprietary Hybrid routing protocol, incorporatingfeatures of both Distance-Vector and Link-State routing protocols.
2. Functions and Characteristic of EIGRP
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.
- 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
- Neighbor table – list of all neighboring routers. Neighbors must belong to the same Autonomous System
- Topology table – list of all routes in the Autonomous System Routing table – contains the best route for each known network
3. Command to configuration EIGRP
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