Why my LACP connection is not up?

Zyxel_Chris Posts: 659  Zyxel Employee
First Anniversary 10 Comments Friend Collector First Answer

If your Link Aggregation Control Protocol (LACP) connection is not coming up, it could be due to several reasons. Here's a checklist of things to consider and troubleshoot:

  1. LACP Configuration Matching:
    • Ensure that LACP is configured consistently on both ends of the link. The LACP mode (Active or Passive) and key must match on both sides.
  2. Cable and Physical Connection:
    • Confirm that the cables are securely connected to the correct ports on both devices. Check for any physical damage to the cables or connectors.
  3. Port Speed and Duplex Settings:
    • Verify that the speed and duplex settings on both ends of the link match. Inconsistent speed or duplex settings can prevent the link from coming up.
  4. Check device configuration: you can also SSH to the device and "show run" to confirm that the device is actually applying the configuration from NCC.

For this instance, I have aggregate port 9 and 10 as trunk and port 11 and 12 as another trunk, and the configuration are applied to the device.