📡

CCNA Course Overview: EIGRP Configurations

Jun 2, 2025

Jeremy's IT Lab: CCNA Course

Introduction

  • Free, complete course for CCNA.
  • Subscription and engagement encouraged for more free content.
  • Lab files available via link in the description.
  • Recommended tool: Boson's NetSim for CCNA, useful for deeper practice and understanding.

Video Focus: EIGRP Configurations

  • Basic EIGRP configurations.
  • Not directly on the exam but introduces key related topics:
    • EIGRP metric
    • Path selection
    • Unequal-cost load-balancing
  • Half lab, half lecture format.

Network and Configuration Details

  • Network setup: EIGRP AS100.
  • Configuration steps:
    1. Hostnames and IP addresses configuration.
    2. Loopback interface configuration on routers R1 to R4.
    3. EIGRP configuration steps.
    4. Explanation of EIGRP metric and paths.

Step 1: Basic Configuration

  • Hostnames, IP addresses, and router interfaces setup.

Step 2: Loopback Interface Configuration

  • Loopback interface provides a router ID for protocols like OSPF.
  • Command examples:
    • Loopback creation: INTERFACE LOOPBACK0
    • IP configuration: IP ADDRESS 1.1.1.1 255.255.255.255

Step 3: EIGRP Configuration

  • Directly enter EIGRP config from interface config mode.
  • Key commands:
    • Enable EIGRP: ROUTER EIGRP 100
    • Enable on all interfaces: NETWORK 0.0.0.0 255.255.255.255
    • Auto-summary: NO AUTO-SUMMARY
    • Passive interface configuration for efficiency.

EIGRP Metric and Path Selection

  • Metric Calculation:
    • Uses bandwidth and delay.
    • Bandwidth of slowest link + delay of all links.
  • Terminology:
    • Feasible Distance: The router's metric to destination.
    • Reported Distance: Neighbor's metric to destination.
    • Successor: Best route with lowest metric.
    • Feasible Successor: Alternate route, meets feasibility condition.

Unequal-Cost Load-Balancing

  • Unique feature of EIGRP.
  • Controlled by the VARIANCE command.
  • Feasibility condition for load-balancing:
    • Only feasible successor routes considered.

Practice and Resources

  • Boson ExSim practice question demonstrated.
  • Understanding EIGRP terms and definitions.
  • Resources: Cisco documentation, Boson ExSim.

Conclusion

  • Encouragement to subscribe and support the channel.
  • Acknowledgment of channel members.
  • Options for leaving tips and showing support via Brave browser.