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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. 

 

■  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. 

•  Untgged 

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 

Frame Leave 

Income Frame is tagged 

Income Frame is untagged 

Leave port is tagged 

Frame remains tagged 

Tag is inserted 

Leave port is untagged 

Tag is removed 

Frame remain untagged