Allied Telesis AT-S60 - Manual (Page 437)

AT-S60 Management Software User’s Guide
Section IV: VLANs 437
Note
The Multiple VLAN modes are supported only in single switch (that
is, an edge switch) environments. This means that cascading of
switches while in a Multiple VLAN mode is not allowed.
Activating a Multiple VLAN mode on a cascaded switch can possibly
result in disconnection of network paths between switches unless
the port used to link the switches is configured as the uplink port.
Configuring Multiple VLANs on cascaded switches can also affect
Enhanced Stacking as the Master switch may not be able to detect
member switches beyond the first cascaded switch.
802.1Q-
Compliant
Multiple VLANs
Mode
802.1Q Multiple VLAN configuration is appropriate when the device
connected to the uplink port is 802.1Q compatible, meaning that the
device can handle tagged packets.
When 802.1Q Multiple VLANs mode is selected, the AT-S60 software
configures all ports on the switch as Client VLANs except for one user-
specified port that is designated as an uplink VLAN. Each Client VLAN
contains one untagged port and one tagged port. The latter functions as
the uplink port.
When you select the 802.1Q-compliant VLAN mode, you are asked to
specify the uplink port. After you specify the port, the switch
automatically creates the VLANs.
Table 12 illustrates this VLAN mode on an AT-8400 Series switch. It lists a
few of the ports on the switch and shows how each port has been added
as an untagged port to its own separate VLAN. Port 2.2 (Slot 2, Port 2)
was selected as the uplink port. It was added as a tagged port to each
VLAN.
Table 12 802.1Q-Compliant Multiple VLAN Example
VLAN Name VID Untagged Port Tagged Port
Client_1 1 1.1 2.2
Client_2 2 1.2 2.2
Client_3 3 1.3 2.2
Client_4 4 1.4 2.2
Client_5 5 1.5 2.2
Client_6 6 1.6 2.2