EIGRP Manual Route Summarization (AS 100)

Bundle lab · $29.99

Implement classic EIGRP manual summarization on R1 to collapse four contiguous /24 loopback routes into a single /22 summary toward R2, reducing R2’s routing table entries while preserving reachability.

Learning objectives

• Enable and verify classic EIGRP adjacencies with classless operation (no auto-summary).
• Advertise multiple contiguous networks and confirm per-prefix learning at a neighbor.
• Configure interface-level EIGRP manual route summarization using ip summary-address.
• Validate summary behavior on the neighbor and the installation of the Null0 discard route on the summarizing router.
• Use show commands to confirm routing table shrinkage and continued end-to-end reachability.

Troubleshooting focus

• AS number mismatch or missing/incorrect network wildcard prevents EIGRP adjacency.
• Summary configured on the wrong interface fails to impact the intended neighbor.
• Non-contiguous prefixes incorrectly summarized may cause blackholing beyond the summary.
• Forgetting no auto-summary can introduce unexpected classful behavior.