3Com 3C16476CS - Manual (Page 39)

Configuring VLANs 39
Port Detail
Choose a port to display the tagged and untagged
VLAN memberships it is associated with.
Figure 30 Port Detail Screen
VLAN Detail
Use this screen to display detailed VLAN information.
1 Enter a set of VLANs or select all VLANs to add to the
details list, then click Select.
2 From drop down menu, choose a VLAN to display the
tagged and untagged VLAN memberships it is
associated with the ports on the switch.
Figure 31 VLAN Detail Screen
Forwarding Tagged/Untagged Frames
Each port on the Switch is capable of passing tagged
or untagged frames.
The following describes how the Switch will handle
tagged and untagged frames.
■ When a port receives a tagged frame with a VLAN
ID and the port is a member (untagged or tagged)
of that VLAN, the frame is accepted. Otherwise the
if the port is not a member of that VLAN, the
frame is discarded.
■ When a port receives an untagged frame and the
port is an untagged member of a VLAN, the frame
is accepted and assigned to that VLAN ID.
Otherwise if the port is not an untagged member
of any VLAN, the frame is discarded.