NSX VLAN Backed Segment showing as "Inaccessible" when migrating VM's in VC

Products

• VMware NSX

Issue/Introduction

• The environment is running NSX with VLAN Segments configured
• After VLAN segment creation, and connecting VM's to these segments through VC, you see network showing as "inaccessible"
  

Environment

VMware NSX

Cause

This can happen for the reasons below:

• VLAN TZ is not applied to this Segment and only an Overlay TZ is applied
• The hosts in the cluster within NSX are not all showing as being applied to this TZ.

Resolution

• Verify that VLAN TZ is applied to this VLAN segment
• Confirm which Hosts the TZ is applying to within the cluster under Networking>Transport Zones
  
  Apply a Transport Node Profile to the Host cluster 
  • Create a TNP under System > Fabric > Hosts > Transport Node Profile > Add Transport Node Profile.
  • Input all required details for VDS, VC, and TZ's making sure to add the Overlay and VLAN TZ's to this TNP
  • Select Radio to select the entire cluster under System>Fabric>Hosts that you want to apply this TNP to
  • Click Configure NSX and select the newly created TNP
  • Confirm the TZ is being applied to all hosts now under Networking>Transport Zones 
  • Connect VM's in VC to this VLAN Segment and you shouldn't see the "inaccessible" error anymore.
    
    Documentation:
    
    Add a Transport Node Profile

                  Create Transport Zones

                  Create an NSX Segment