24.1.3 Default VLAN
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(1) Overview
The Switch allows Layer 2 forwarding immediately after startup, even when the configuration has not been set up yet. In this case, all ports are access ports belonging to VLAN ID 1, which is known as the default VLAN. The default VLAN always exists, and its VLAN ID of 1 cannot be changed.
(2) Ports Excluded from Defaults VLAN
Access ports belong to VLAN 1 (the default VLAN) when their configuration has not been set up. However, depending on the configuration, they might be excluded from automatic ownership by the default VLAN. The following ports do not automatically belong to the default VLAN:
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Ports for which anything other than VLAN 1 is specified for the access port
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All ports, when VLAN tunneling is configured
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Mirror port for port mirroring (when 802.1Q Tag grant function is not used)
Ports other than access ports (protocol ports, MAC ports, trunk ports, and tunneling ports) cannot be automatically assigned to a VLAN.