Run Traceflow between virtual machines or interfaces where Distributed Load Balancer is enforced and the Distributed Load Balancer virtual IP address (VIP).

Use Traceflow for debugging purposes, when:
  • On a client guest VM, where a Distributed Load Balancer service is applied, if the communication is lost between the guest VMs to Distributed Load Balancer.
  • Or when guest VMs sending east-west traffic to another VM in the network drops.


  1. From your browser, log in with admin privileges to an NSX Manager at https://<nsx-manager-ip-address>.
  2. Navigate to the Plan & Troubleshoot tab, and click Traceflow.
  3. Enter source (for example, virtual machine where Distributed Load Balancer is enforced) and destination (Distributed Load Balancer VIP).
  4. Click Trace.

  5. View results.
    • As DLB is not based on rules, if Distributed Load Balancer drops a packet, there are not rule IDs that show up in the traceflow output details.

    • If Distributed Load Balancer and DFW services are applied to a client virtual machine, a member of a group, first Distributed Load Balancer service is applied followed by DFW rules service.