Allied Telesis AT-8324SX - Manual (Page 33)

AT-8324SX Installation Guide
33
Making VLAN
Connections
VLANs can be based on port groups, or each data frame can be explicitly
tagged to identify the VLAN group it belongs to. When using port-based
VLANs, ports can either be assigned to one specific group or to all
groups. Port-based VLANs are suitable for small networks. A single
switch can be easily configured to support several VLAN groups for
various organizational entities (such as Finance and Marketing).
When you expand port-based VLANs across several switches, you need
to make a separate connection for each VLAN group. This approach is,
however, inconsistent with the STP, which can easily segregate ports
that belong to the same VLAN. When VLANs cross separate switches, it is
therefore better to use VLAN tagging. This allows you to assign multiple
VLAN groups to the trunk ports (that is, tagged ports) connecting
different switches.
Figure 10 Making VLAN Connections
Note
When connecting to a switch that does not support IEEE 802.1Q
VLAN tags, use untagged ports.
10BASE-T / 10 0BASE-TX FAST ETHERNET SWITCH
AT-8324SX Fast Ethernet Switch
Tagged
Ports
Untagged Ports
Tagged
Ports
VLAN Aware
Switch
VLAN Unaware
Switch
VLAN 1
R & D
VLAN 2
Testing
VLAN 3
Finance
VLAN 4
Marketing VLAN 5
Finance VLAN 1
R & D VLAN 2
Testing