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IntermediatePublished 2026-07-03

EIGRP Manual Route Summarization (AS 100)

Bundle lab

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.

Track
Est. time
40 minutes
Difficulty
Intermediate
Topics

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.

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How this lab is graded
  • Build it your way. Where a lab lets you choose a value — a VLAN name, an interface description — grading checks that you configured it, not which name you picked. Names that another line has to reference, like an ACL applied with access-class, are stated in the guide and do have to match.
  • Addresses, modes and protocol keywords are exact. An IP address, a subnet mask, switchport mode trunk, an encapsulation — these carry the meaning of the lab, so they are graded as written in the guide.
  • Grading reads your saved configuration. Export the lab from CML after you have configured it, and make sure anything you set is in the running-config — a change that only exists in a terminal session never reaches the grader.
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