Table of contents

  1. 0. CCNA Exam Questions
  2. 10. Dynamic Roututing
    1. 10.9 EIGRP = Enhanced Interior Gateway Routing Protocol (Dynamic)
      1. 10.9.1 EIGRP AD and Metric (= Distance) & AS
      2. 10.9.2 Configuring EIGRP in Cisco IOS

Lesson 9 - CCNA Fast Track (June, 2025). We left off at page 163.

0. CCNA Exam Questions

1.

10. Dynamic Roututing

10.9 EIGRP = Enhanced Interior Gateway Routing Protocol (Dynamic)

  • Intro:
    • EIGRP = Cicso proprietry dynamic routing protocol
    • Default AD for EIGRP is 90, refer to this AD-List

10.9.1 EIGRP AD and Metric (= Distance) & AS

  • EIGRP uses composite metric (Erog, EIGRP Metric = Bandwith + Delay)
  • Let’s revist some important conecepts between EIGRP vs OSPF, also refer to this AD-list
FeatureEIGRPOSPF
MetricComposite metric (bandwidth + delay)Math formula: (100M/x) + (100M/y)
Cisco only / ProprietaryYESNO
Default AD Value90110
  • AS = Autonomous Number, determined by network admin. Same AS numbers allow devices to communicate with each other.

10.9.2 Configuring EIGRP in Cisco IOS

  • Topology:
  • Step 1: Setup R1
    •   en
  conf t

  int g0/1
  ip address 10.0.0.1 255.0.0.0
  no shut

  int g0/0
  ip address 192.168.1.1 255.255.255.0
  no shut

  end
  • Step 2: Setup R2
    •   en
  conf t
        
  int g0/1
  ip address 172.16.0.2 255.255.0.0
  no shut

  int g0/0
  ip address 192.168.1.2 255.255.255.0
  no shut
        
  end
  • Step 3: Set EIGRP R1 via router eigrp 11. Recall the syntax is router eigrp <Autonomous system / AS >
    •   conf t
  router eigrp 11
  network 192.168.1.0 0.0.0.255
  network 10.0.0.0 0.255.255.255
  end
    • Couple of things we noticed:
      • Recall: Wildcard masks bits 1 means cannot change and 0 means we can change into any number!
      • IP 192.168.1.x for g0/0 to participate in EIGRP
      • Also setting up 10.0.0.0 network to propogate in EIGRP
  • Step 4: Set EIGRP R2 via router eigrp 11
    •   conf t
  router eigrp 11
  network 
  network