3Com 2226 PLUS - Manual (Page 46)

46 C HAPTER 4: C ONFIGURING THE S WITCH
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 the drop down menu, choose a VLAN to display
the associated tagged and untagged member ports.
Figure 29 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. 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. If the port is
not an untagged member of any VLAN, the frame is
discarded.
The Switch will only forward a frame to ports that are
members (tagged or untagged) of the VLAN to which
the frame is assigned. If the port is an untagged
member, the egress frame will be stripped of the VLAN
tag and forwarded as untagged. However, if the port is
a tagged member, the egress frame is forwarded as
tagged.
Sample VLAN Configurations
To illustrate how you can segment network devices that
are connected to the Switch, the following sample
configurations are provided.