Administration - Authentication : Packet Format : Configuring Packet Dissection
  
Configuring Packet Dissection
1. Go to Administration > General Traffic Settings: Packet Format.
2. Enable or disable L3 GRE, VxLAN, or MAC in MAC by clicking the radio button that specifies the behavior you want to have configured.
3. If VxLAN is enabled, specify the UDP port used by VxLAN. The default UDP port is 4789.
4. Specify the MPLS level.
5. Specify the VLAN level.
6. Click Apply to make or Revert to reset the changes made.