Hi,
See the options:
• Interface—Select a Port/LAG.
• Interface VLAN Mode—Select the interface mode for the VLAN. The options are:
- General—The interface can support all functions as defined in the IEEE 802.1q specification. The interface can be a tagged or untagged member of one or more VLANs.
- Access—The interface is an untagged member of a single VLAN. A port configured in this mode is known as an access port.
- Trunk—The interface is an untagged member of one VLAN at most, and is a tagged member of zero or more VLANs. A port configured in this mode is known as a trunk port.
- Customer—Selecting this option places the interface in QinQ mode. This enables you to use your own VLAN arrangements (PVID) across the provider network. The device is in Q-in-Q mode when it has one or more customer ports. See QinQ.
http://www.cisco.com/en/US/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/78-19308-01.pdf
Hope this helps.
