How to validate LACP state?

• A. Run traceroute
• B. Check power levels
• C. Both ends show same members active and in sync; mismatches cause one-way traffic.
• D. Disable LACP

Answer: (C)

Validating LACP state centers on confirming that both ends of the link aggregation agree on which ports are part of the bundle and that those ports are actively synchronized. LACP negotiates with each side to advertise the active member set; when both sides report the same active members and status, the port-channel can forward traffic smoothly across the aggregated links. If there’s a mismatch, traffic may fail to balance or even flow only in one direction, because the partner will not treat some links the same way. To verify, check the LACP/port-channel status on both devices and confirm that the same interfaces appear as active members and that the channel is in a forwarding, synchronized state. Traceroute or power levels don’t reveal LACP state, and disabling LACP would remove the control mechanism rather than validate its current status.