LLDP for Multi-Vendor Discovery

Bundle lab · $29.99

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.

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