Resolving Faulted LACP Negotiation
Issue
You receive a Faulted LACP negotiation error when trying to configure NIC Teaming (LACP) between a Datto Switch and Windows Server 2012 R2.
Environment
- Datto Switches
Cause
LACP requires the server and switch to have the same time-out setting. By default, Datto switches are set to slow time-out. If the settings do not match, you will see a Faulted LACP negotiation error in the Windows NIC Teaming interface.
Figure 1: Faulted LACP negotiation error
Resolution
Although Datto can recommend changes to the Windows registry, always confirm with a Microsoft expert that the recommended changes are compatible with your environment before making any changes.
Microsoft has published a hotfix enabling slow time-out on the server:
- Windows Server 2012 r2 (external link)
- Windows Server 2016 (external link)
This worked when the following variables match:
- Teaming mode: LACP
- Load balancing mode: Dynamic
Figure 2: NIC team properties
