EIGRP Troubleshooting for CCNA– From Basics to Real Scenaris

Name: EIGRP Troubleshooting for CCNA– From Basics to Real Scenaris
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Practical EIGRP troubleshooting with hands-on labs for CCNA students

Created bySaeed Ghasemianpoor

Last updated 1/2026

English

What you'll learn

Understand how EIGRP works at the CCNA level, including neighbor relationships, metrics, DUAL algorithm, and routing tables
Identify and troubleshoot common EIGRP problems such as adjacency failures, missing routes, incorrect metrics, and route flapping
Detect and fix EIGRP misconfigurations including AS number mismatches, passive interfaces, K-values, and authentication issues
Troubleshoot EIGRP in multi-router topologies commonly seen in CCNA labs and exam questions

Course content

2 sections • 18 lectures • 41m total length

Introduction0:25
Identify and fix common EIGRP issues in a practical CCNA-level session, offering actionable troubleshooting steps for EIGRP and naval problems.

What is EIGRP?0:26
How does EIGRP work?1:06
Discover how EIGRP works by forming neighbor relationships, exchanging routing information, and selecting the best path through metric calculations using bandwidth, delay, reliability, and MTU.
Why is EIGRP important?0:26
Discover why EIGRP matters for CCNA, and how its fast convergence finds backup routes when the main path fails.
EIGRP Packet Types2:30
Questions
basic Cisco IOS configuration2:41
Learn basic Cisco IOS configuration and EIGRP setup on two routers in Cisco Packet Tracer, including interface serial configuration, IP addresses, SSH access, and no shutdown.
Basic EIGRP Troubleshooting3:19
Troubleshooting scenario -16:48
Diagnose EIGRP across three routers, verify interfaces, neighbors, and networks 192.168.10.0, 192.168.20.0, and 192.168.30.0, and resolve the missing route.
Troubleshooting scenario 23:11
What is a Router ID (RID)?2:00
Learn rotor ID, a unique 32-bit number identifying a rotor in EGRP or OSPF, and how to choose it manually, by loopback IP, or by the highest interface IP.
What is a Passive Interface?1:06
Explain that a passive interface prevents routing updates on a router interface and demonstrate enabling it for Ethernet 0 under EIGRP 10.
Why use Passive Interface?1:08
Learn why passive interfaces stop unnecessary routing updates, boost security, and reduce traffic, by defining a passive interface as a router interface where OSPF does not send updates.
Config Passive Interface0:49
Configure a passive interface and verify it with the show IP portables command to display the passive interface details.
Troubleshooting scenario 33:10
Identify and resolve EIGRP issues by inspecting neighbors, routing table entries, and interfaces; fix a passive serial interface to bring the EIGRP adjacency up and verify routes.
Troubleshooting scenario 44:50
Troubleshoot eigrp metric configuration across rotor one and rotor two by aligning bandwidth, delay, load, and reliability, fix car value mismatches, and verify neighbors with show ip protocols.
What is EIGRP Authentication?0:31
Discover how EIGRP authentication acts as a security feature that protects routing information by requiring a trust layer for exchanges.
Why use EIGRP Authentication?0:33
Learn why EIGRP authentication is used and why you might lose it, and how authentication protects the network within the EIGRP domain.
EIGRP Authentication6:58
Configure eigrp authentication between routers by creating a key chain and kchain, applying ip authentication on the interfaces, and enabling eigrp 10 authentication.

Requirements

Familiarity with Cisco CCNA fundamentals (routing concepts, static and dynamic routing)
Basic knowledge of Cisco IOS commands is helpful but not required

Description

EIGRP is one of the most important routing protocols covered in the CCNA exam, but many students struggle when it comes to troubleshooting real EIGRP problems. Understanding theory is not enough — you must know how to identify issues, analyze outputs, and fix routing problems step by step.
This course is designed to help you do exactly that.

In CCNA EIGRP Troubleshooting, you will learn how EIGRP really behaves in real network scenarios and how to systematically troubleshoot the most common issues faced by CCNA students and junior network engineers. The course focuses on hands-on labs, practical examples, and real troubleshooting scenarios, not just theory.

You will start by reviewing essential EIGRP concepts such as neighbor relationships, metrics, DUAL, routing tables, and topology tables — explained clearly at the CCNA level. Then, you will dive into real troubleshooting cases, including adjacency failures, missing routes, incorrect metrics, passive interfaces, AS number mismatches, K-value problems, and authentication issues.

Throughout the course, you will learn how to use Cisco IOS troubleshooting commands such as show and debug commands to identify problems quickly and efficiently. Each issue is analyzed step by step so you understand not only what is wrong, but why it is happening and how to fix it correctly.

This course is ideal for CCNA exam preparation, hands-on practice, and building real-world troubleshooting confidence. By the end of the course, you will be able to approach EIGRP issues in a structured way and troubleshoot Cisco routing problems with clarity and confidence.

If you want to move beyond memorization and truly understand EIGRP troubleshooting at the CCNA level, this course is for you.

Who this course is for:

CCNA students who want to clearly understand EIGRP and learn how to troubleshoot routing issues with confidence.
Learners preparing for CCNA exams who want hands-on troubleshooting practice instead of just theory.
Anyone with basic networking knowledge who wants to strengthen their routing and problem-solving skills using real-world scenarios.

EIGRP Troubleshooting for CCNA– From Basics to Real Scenaris

What you'll learn

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Course content

Introduction1 lecture • 1min

Eigrp17 lectures • 42min

Requirements

Description

Who this course is for: