26.3.2 Native VLAN

Protocol ports, MAC ports, and trunk ports have a native VLAN to handle frames that do not match the configuration. The native VLAN for each port is VLAN 1 (the default VLAN) unless otherwise specified in the configuration. It can also be changed to another port VLAN.

For example, if VLAN#B is set to native VLAN on a trunk port in Figure 26-3: Configuration of port VLAN, VLAN#B forwards the trunk port in Untagged frame.