Chapter 4: Web-Based Management

NOTE: All unselected ports are treated as belonging to another single VLAN. If the port-based VLAN is enabled, the VLAN-tagging is ignored.

802.1Q VLAN

Tagged-based VLAN is an IEEE 802.1Q specification standard. Therefore, it is possible to create a VLAN across devices from different switch venders. IEEE 802.1Q VLAN uses a technique to insert a "tag" into the Ethernet frames. Tag contains a VLAN Identifier (VID) that indicates the VLAN numbers.

You can create and delete Tag-based VLAN. There are 256 VLAN groups to provide configure. Enable 802.1Q VLAN, the all ports on the switch belong to default VLAN, VID is 1. The default VLAN can't be deleting.

Understand nomenclature of the Switch

IEEE 802.1Q Tagged and Untagged

Every port on an 802.1Q compliant switch can be configured as tagged or untagged.

Tagged

Ports with tagging enabled will put the VID number, priority and other VLAN information

 

into the header of all packets that flow into those ports. If a packet has previously been

 

tagged, the port will not alter the packet, thus keeping the VLAN information intact. The

 

VLAN information in the tag can then be used by other 802.1Q compliant devices on the

 

network to make packet-forwarding decisions.

 

 

Untagged

Ports with untagging enabled will strip the 802.1Q tag from all packets that flow into

 

those ports. If the packet doesn't have an 802.1Q VLAN tag, the port will not alter the

 

packet. Thus, all packets received by and forwarded by an untagging port will have no

 

802.1Q VLAN information. (Remember that the PVID is only used internally within the

 

Switch). Untagging is used to send packets from an 802.1Q-compliant network device to

 

a non-compliant network device.

 

 

Frame Income

Income Frame is tagged

Income Frame is untagged

Frame Leave

 

 

Leave port is tagged

Frame remains tagged

Tag is inserted

Leave port is untagged

Tag is removed

Frame remain untagged

GE-DS-82 and 82-PoE Ethernet Managed Switch User Manual

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GE 82-POE, GE-DS-82 user manual 802.1Q Vlan, Understand nomenclature of the Switch, Tagged, Untagged