3Com 2226-SFP Switch User Manual


 
Configuring VLANs 49
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 37 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.
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.