PLANET WGS3-24240 - Manual (Page 114)

User’s Manual of WGS3-24000 / WGS3-24240
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VLAN (VID 1). The default VLAN cannot be deleted.
Understand nomenclature of the Switch
Tagging and Untagging
Every port on an 802.1Q compliant switch can be configured as tagging or untagging.
。 Tagging: 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.
。 Untagging: 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
Figure 4-3-1 VLAN Configuration