Delete Vlans; Forwarding Tagged/Untagged Frames; Sample Vlan Configurations - 3Com Baseline 2848-SFP Plus User Manual

A tagged port is sometimes referred to as an uplink
port. The two terms refer to the same feature.
If a port is already an untagged member of VLAN 0,
making it an untagged memeber of VLAN 1 will
disassociate it from VLAN 0. The same result happens
from VLAN 1 to VLAN 0.

Delete VLANs

Click the Remove button to remove the selected VLAN
group from the current list.
In VLAN ID, click the ID of the VLAN group that you
1
want to delete.
2 Click Remove.
If any port is assigned to this VLAN group as untagged,
it will be reassigned to VLAN group 1 as untagged.

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.
Setting Up Two VLANs on the Same Switch
Figure 14 illustrates how you can set up a simple VLAN
on the Switch using untagged connections.
Configuring VLANs 35