EIGRP Troubleshooting Capstone

Bundle lab · $29.99

Advanced CCNP-level EIGRP troubleshooting on a 3-router triangle with seeded faults: an AS mismatch on R3 and a missing network statement on R1 prevent a full-mesh of adjacencies and block reachability to a loopback LAN. Learners diagnose using show commands and repair the configuration to restore end-to-end reachability.

Learning objectives

• Diagnose and correct EIGRP neighbor formation issues using show commands
• Validate EIGRP domain membership, K-values, and participating interfaces
• Confirm route propagation and end-to-end reachability via sourced pings
• Apply deterministic network statements that match transit /30s and loopbacks
• Document the fault isolation process and final healthy-state evidence

Troubleshooting focus

• If a neighbor is missing, verify EIGRP runs on the correct interface subnets and that domain parameters match.
• Use show ip protocols to confirm the AS number and which interfaces EIGRP is enabled on.
• Check for control-plane mismatches (AS/K-values/auth) before assuming data-plane or cabling issues.
• Compare EIGRP interfaces against actual interface addressing to catch missing or incorrect network wildcards.
• Validate route tables end-to-end: an advertised loopback should appear as an internal EIGRP route on remote routers.