NSX Manager has alarm 'MPA Connectivity Down'. BME is not accessible over Management Plane.

Products

• VMware NSX

Issue/Introduction

Each NSX deployment has a management plane cluster (MP) and a control plane cluster (CCP). The MP and the CCP push configurations to each transport zone's local control plane (LCP). When a host or NSX Edge joins the management plane, the management plane agent (MPA) establishes connectivity with the host or NSX Edge, and the host or NSX Edge becomes an NSX fabric node. When the fabric node is then added as a transport node, LCP connectivity is established with the host or NSX Edge.
If Edge loses Management Plane connection, we will see alarms related to MPA connectivity down.

Following symptoms may be seen in this event and are not limited for NSX Edge Node Connectivity Loss (or Failure):

• If an Edge Node fails or loses connectivity to the Manager (and thus cannot receive updates or participate in the control plane)
• Direct Data Plane Impact: Traffic that is routed through or relies on services (e.g., NAT, VPN, Load Balancing) on that specific Edge Node will be immediately impacted or cease to flow through that Edge.
• HA Solutions: If Edge Node HA (Active/Standby or Active/Active for certain services) is configured, traffic will fail over to the healthy Edge Node, minimizing disruption. 
  Management Plane Impact: The NSX Manager will report the Edge Node as disconnected or down, limiting management capabilities for that specific Edge.

 

Cause

An MPA connection down signifies the Management Plane Agent on the NSX-T Edge has lost its communication link with the NSX Manager, resulting in a loss of management control and visibility for that Edge.

Resolution

Validate Management Network setting over Edge.
In case of Bare Metal Edge only active-backup mode is allowed on a bond interface. Find Reference techdocs article here and NSX-T configuring Edge bonds/Teaming/LACP 

NSX Edge Networking Setup