Allied Telesis AT-S63 - Manual (Page 560)

Chapter 23: Port-based and Tagged VLANs
560 Section V: VLANs
The port assignments for the VLANs are as follows:
This example is nearly identical to the “Port-based Example 2” on
page 554. Tagged ports have been added to simplify network
implementation and management.
One of the tagged ports is port 5 on the top switch. This port has been
made a tagged member of the three VLANs. It is connected to an IEEE
802.1Q-compliant server, meaning the server can handle frames from
multiple VLANs. Now all three VLANs can access the server without going
through a router or other interconnection device.
It is important to note that even though the server is accepting frames from
and transmitting frames to more than one VLAN, data separation and
security remain.
Two other tagged ports are used to simplify network design in the
example. They are ports 5 and 8 on the upper switch and port 7 on the
lower switch. These ports have been made tagged members of the Sales
and Engineering VLANs. They provide a connection between the different
parts of these two VLANs.
In the “Port-based Example 2” on page 554, each VLAN needed its own
data link between the switches to connect the different parts of the VLANs.
But with tagged ports, you can use one data link to carry data traffic from
several VLANs, while still maintaining data separation and security. The
tagged frames, when received by the switch, are delivered only to those
ports that belong to the VLAN from which the tagged frame originated.
Sales VLAN (VID 2)
Engineering VLAN
(VID 3)
Production VLAN
(VID 4)
Untagged
Ports Tagged
Ports Untagged
Ports Tagged
Ports Untagged
Ports Tagged
Ports
AT-9424T/
SP Switch
(top) 1-2, 4
(PVID 2) 5, 8 7-10
(PVID 3) 5, 6 19, 21-
23(PVID 4) 5
AT-9424T/
GB Switch
(bottom) 1-4 (PVID 2) 7 114, 16, 18,
22
(PVID 3) 7 none none