Determining the VLAN

The switch uses the following steps to determine the VLAN to be associated with the packet in the payload:

  1. Check the VLAN ID in the payload, if tagged.
  2. Use the primary VLAN of the in-port for untagged packets.

    If the in-port does not have a primary VLAN associated with it, the first instance of the VLAN in the list is used. The first instance of the VLAN in the list if the packet is untagged and in-port is a tunnel port.

  • If the VLAN determined from the above step is not a member VLAN of the instance, the packet is dropped.

  • If the packet in the packet_out message is an LLDP frame, the packet is always sent untagged to the switch.