Allied Telesis AT-S60 - Manual (Page 417)

AT-S60 Management Software User’s Guide
Section IV: VLANs 417
Basic VLAN Mode Overview
The Fast Ethernet Switches support a special VLAN configuration
referred to as the Basic VLAN Mode. When the Basic VLAN Mode is
activated, frames are forwarded based solely on MAC addresses. All
VLAN information, including PVIDs assigned to ports and VLAN tags in
tagged frames, is ignored. Tagged frames are analyzed only for priority
level.
Packets are passed through the switch unchanged. Tagged and
untagged frames exit the switch the same as they entered, either tagged
or untagged, regardless of the type of ports on which the frames are
received and transmitted.
You should be aware of the following before you activate the Basic VLAN
mode:
❑ If a packet received on a switch port contains a MAC address not
already stored in the MAC address table, the packet is flooded out
all ports in the AT-8400 Series switch, except for the port on which
the packet was received.
❑ You can create and modify port-based or tagged VLANs when the
Basic VLAN Mode is activated, but the VLANs are not active. Port-
based and tagged VLANs are active only when the switch in
operating in the Tagged mode. Additionally, pre-existing port-
based or tagged VLANs are retained in the event you later
disabled Basic VLAN Mode, but the VLANs are not used.
Note
For instructions on how to activate the Basic VLAN mode, refer to
Setting a Switch’s VLAN Mode on page 432.