Planet Networking & Communication WGS3-24000 User Manual page 97

4.3.1.1 VLAN Configuration
802.1Q VLAN Configuration
There are up to 4041 configurable VLAN groups. By default when 802.1Q is enabled, all ports on the switch belong to default
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
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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
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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
Leave port is tagged
Leave port is untagged
Income Frame is tagged
Frame remains tagged
Tag is removed
Figure 4-3-1 VLAN Configuration
Income Frame is untagged
Tag is inserted
Frame remain untagged
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