EIGRP Fundamentals: First Adjacency & Route Exchange

Bundle lab · $29.99

Bring up EIGRP in AS 100 between two routers over a /30 transit and advertise a single LAN. Verify the first adjacency forms and that R2 learns R1's LAN via EIGRP. Includes realistic end hosts on a shared LAN for path testing.

Learning objectives

• Enable EIGRP with a consistent AS number and default K-values across routers
• Use network statements with correct wildcards to activate EIGRP on the intended interfaces
• Disable auto-summary for classless behavior
• Verify EIGRP adjacency formation and route exchange with core IOS show commands
• Validate end-to-end reachability from a host across the routed transit

Troubleshooting focus

• If neighbors do not form, confirm both sides use the same EIGRP AS and that the shared transit is matched by a network statement on both routers.
• Confirm IP addressing, masks, and interface status on the transit: both ends must be in 10.0.12.0/30 and up/up.
• Check show ip protocols to ensure auto-summary is disabled and the correct networks are included.
• On R2, if 192.168.1.0/24 is missing from the routing table, confirm R1 advertises that LAN and that adjacency is up.
• From the host, if you can ping the default gateway but not R2, suspect missing EIGRP advertisement or neighbor down.