Allied Telesis AT-S24 - Manual (Page 124)

Configuring Virtual LANs and Quality of Service
124
Activating and Deactivating the Multiple VLAN Mode
The multiple VLAN mode is designed to simplify the task of configuring
the switch in network environments where each port needs to be in its
own VLAN. Rather than having to create each VLAN separately, you can
use this mode to create the VLANs automatically.
When activated, the mode assigns each port to a separate VLAN. The
mode assigns a name to each VLAN and a VID number based on the port
number. For example, the VLAN for Port 1 is named V1 and is given the
VID of 1, the VLAN for Port 2 is named V2 and is given the VID of 2, and so
on. The port PVIDs are also automatically assigned. For example the PVID
for Port 1 is assigned as 1, to match the VID of 1.
The mode also designates the two last ports on the switch as uplink and
downlink ports that can be used to cascade AT-8224XL Switches and to
act as a link to a WAN. The uplink port is assigned as a tagged port to all
the other VLANs on the switch. Thus, while the switch ports are
separated from each other, they all have access to the uplink port for
access to the WAN.
This highly segmented configuration can be useful in situations where
the traffic generated by each end node or network segment connected
to a port on the switch needs to be kept separate from all other network
traffic, while having access to an uplink to a WAN. Unicast traffic received
by the uplink port is effectively directed to the appropriate port and end
node, and is not directed to any other port.
When activating the multiple VLAN mode, be aware of the following:
❑ The VLANs cannot be modified or deleted.
❑ The uplink and downlink ports must be of the same media type.
❑ The uplink and downlink ports cannot be used as switch ports.
The ports should only be used to cascade other AT-8224XL
switches and to provide a link to a WAN.
❑ The spanning tree protocol should be activated on the switches
where loops exist in your network topology.
❑ You will not be able to manage the switch using Omega with a
web browser.