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BeginnerPublished 2026-07-04

LLDP for Multi-Vendor Discovery

Bundle lab

Enable the open-standard LLDP on adjacent Cisco IOS routers over direct point-to-point links while also attaching the devices to a shared management LAN. Learners configure deterministic LLDP behavior (global enable plus per-interface transmit/receive) and verify neighbor discovery without adding any routing protocols or static routes.

Track
Est. time
45 minutes
Difficulty
Beginner
Topics

Learning objectives

  • Explain why LLDP (802.1AB) is valuable in mixed-vendor environments
  • Enable LLDP globally on Cisco IOS and control transmit/receive at the interface level
  • Verify LLDP neighbors and interpret key information elements
  • Differentiate direct-neighbor discovery from switch-mediated links where only the switch is seen

Troubleshooting focus

  • LLDP globally disabled (no neighbors ever appear)
  • Per-interface LLDP disabled (neighbor missing on a single link)
  • Routers wired through a switch instead of point-to-point (you only see the switch as the neighbor)
  • Timers or LLDP hold multiples delaying neighbor appearance
  • Interface administratively down or wrong subnet preventing basic reachability checks

Topology

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Grade your work

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.
  • You can submit as many times as you like. Your best score stands, and each attempt tells you which checks passed so you can work the gaps.
  • Scored something you believe is correct? Use Report an issue on this page — that is exactly how the grading fixes in the changelog got found.

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