EIGRP Feasibility Condition, Offset Lists, and Variance

This post and video lesson will help you fully understand EIGRP basics such as successor routes, feasible successors, EIGRP feasibility condition, variance for unequal cost multipathing, and more!

EIGRP Feasibility Condition

Hey hey! Today I made a video to keep from going quarantine crazy. Has the EIGRP feasibility condition ever confused you?

Have you ever wondered what the variance command is all about, or what a feasible successor is?

Well in this EIGRP Lesson we will discuss all of these things! First we go over some key EIGRP terms and then we have a lab exercise in using an offset list and variance command to implement unequal-cost multipathing.

To make the best use of this lesson, you should have a basic understanding of configuring EIGRP. This is great studying for CCNA, CNNP ENCOR / ENARSI.

Enjoy!

EIGRP – Successor Routes, Feasible Successors, Feasibility Condition, and more!

EIGRP Feasibility and Variance made Easy!

Please let me know what you think or how these could be improved in the comments. Like and subscribe on YouTube or connect with me on LinkedIn.

I hope you feel like you know more about the EIGRP feasibility condition and the other topics covered after watching 🙂

In conclusion, we learned some basic EIGRP terminology, we used an offset list to manipulate the metric of a route learned on an EIGRP router, and we used the variance command to enable unequal-cost multipathing — one of EIGRP’s coolest features.

EIGRP Vocabulary for your convenience

Below I will post some of the definitions so you can easily copy and paste:

Successor Route – The route with the lowest path metric to the destination

Successor – First next hop router for the successor route

Feasible Distance – Metric Value for the lowest metric path to destination

Reported Distance – The distance reported by a router to reach a destination prefix. Value is the feasible distance for the advertising router.

Feasibility Condition – Condition stating that for a route to be considered as a backup route, the reported distance received for that route must be lower than the feasible distance calculated locally. This logic guarantees a loop free path.

Feasible Successor – a route that satisfies the feasibility condition and is maintained as a backup route.

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If you’re interested in more lessons, check out the rest of the blog to see what I’ve been studying lately!

Alex Gray

Author: Alex Gray

Aspiring IT professional focusing on networking, network security, advanced troubleshooting, web development, consulting, and more.

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