User`s guide

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Figure 2-30
 802.1Q VLAN
There are up to 256 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 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.
Here pay attention to explain of “Access” and “Trunk”.
 Access: Ports will strip the 802.1Q tag from all packets that out of those ports. If
the packet doesn’t have an 802.1Q VLAN tag, the port will not alter the packet.