View BFD status between transport nodes. Each transport node detects connectivity status with another remote transport node through a tunnel status that displays the BFD status among other details related to the node.

Both Host Transport nodes (standalone and hosts registered to a vCenter) and Edge nodes display the tunnel status. BFD packets support both GENEVE and STT encapsulation. GENEVE is the default encapsulation.


  1. From a browser, log in with admin privileges to an NSX Manager at https://<nsx-manager-ip-address>.
  2. Navigate the UI based on the NSX-T Data Center version and select a host:
    • (NSX-T Data Center 3.2.2 or later) System > Fabric > Hosts and select the Cluster tab.
    • (NSX-T Data Center 3.2.1 or earlier) System > Fabric > Nodes > Host Transport Nodes

      and from the Managed by dropdown menu, select a vCenter Server.

  3. On the Tunnel column, click the tunnel number that is displayed.
    The Monitor page displays the status of tunnel, BFD diagnostic code, remote node UUID, encapsulation on BFD packets, and tunnel name.
    The tunnel BFD diagnostic code indicates the reason for the change in the session state.
    Code Description


    No Diagnostic


    Control Detection Time Expired


    Echo Function Failed


    Neighbor Signaled Session Down


    Forwarding Plane Reset


    Path Down


    Concatenated Path Down


    Administratively Down


    Reverse Concatenated Path Down


If the BFD status is down, use the diagnostic code to troubleshoot the issue.