A virtual local area network (VLAN) uses part of the Ethernet header to indicate which virtual network a given Ethernet frame belongs to. SD-WAN appliances support VLAN trunking in all forwarding modes (inline, WCCP, virtual inline, and group mode). Traffic with any combination of VLAN tags is handled and accelerated correctly.
For example, if one traffic stream passing through the accelerated bridge is addressed to 10.0.0.1, VLAN 100, and another is addressed to 10.0.0.1, VLAN 111, the appliance knows that these are two distinct destinations, even though the two VLANs have the same IP address.
You can assign a VLAN to all, some, or none of the appliance’s ethernet ports. If a VLAN is assigned to a port, the management interfaces (GUI and CLI) listen only to traffic on that VLAN. If no VLAN is assigned, the management interfaces listen only to traffic without a VLAN. This selection is made on the Configuration: Appliance Settings: Network Adapters: IP Addresses tab.