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Forwarding Tagged/Untagged Frames

If you want to create a small port-based VLAN for devices attached
directly to a single switch, you can assign ports to the same
untagged VLAN. However, to participate in a VLAN group that
crosses several switches, you need to create a VLAN for that group
and enable tagging on all ports.
Ports can be assigned to multiple tagged or untagged VLANs. Each
port on the switch is therefore capable of passing tagged or
untagged frames. When forwarding a frame from this switch along
a path that contains any VLAN-aware devices, the switch should
include VLAN tags. When forwarding a frame from this switch
along a path that does not contain any VLAN-aware devices
(including the destination host), the switch must first strip off the
VLAN tag before forwarding the frame. When the switch receives a
tagged frame, it will pass this frame onto the VLAN(s) indicated by
the frame tag. However, when this switch receives an untagged
frame from a VLAN-unaware device, it first decides where to
forward the frame, and then inserts a VLAN tag reflecting the
ingress port’s default VID.
Displaying Basic VLAN Information
The VLAN Basic Information page displays basic information on
the VLAN type supported by the switch.
Command Attributes
•VLAN Version Number* – The VLAN version used by this
switch as specified in the IEEE 802.1Q standard.
•Maximum VLAN ID – Maximum VLAN ID recognize d by this
switch.
•Maximum Number of Supported VLANs – Maximum
number of VLANs that can be configured on this switch.