Allied Telesis AT-S63 - Manual (Page 466)

Chapter 20: Multiple VLANs
466 Section III: VLANs
This highly segmented configuration is useful in situations where 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 still allowing 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 on the switch.
The 802.1Q Multiple VLAN configuration is appropriate when the device
connected to the uplink port is IEEE 802.1Q compatible, meaning that it
can handle tagged packets.
When you select the 802.1Q-compliant VLAN mode, you are asked to
specify the uplink VLAN port. You can specify only one uplink port. The
switch automatically configures the ports into the separate VLANs.
Note
The uplink VLAN is the management VLAN. Any remote
management of the switch must be made through the uplink VLAN.
Non-802.1Q
Compliant
Multiple VLAN
Mode
Unlike the 802.1Q-compliant VLAN mode, which isolates port traffic by
placing each port in a separate VLAN, this mode forms one VLAN with a
VID of 1 that encompasses all ports. To establish traffic isolation, it uses
port mapping. The result, however, is the same. Ports are permitted to
forward traffic only to the designated uplink port and to no other port,
even when they receive a broadcast packet.
Client_VLAN_15 15 15 22
Client_VLAN_16 16 16 22
Client_VLAN_17 17 17 22
Client_VLAN_18 18 18 22
Client_VLAN_19 19 19 22
Client_VLAN_20 20 20 22
Client_VLAN_21 21 21 22
Uplink_VLAN 22 22
Client_VLAN_23 23 23 22
Client_VLAN_24 24 24 22
Table 20. 802.1Q-Compliant Multipe VLAN Example (Continued)
VLAN Name VID Untagged Port Tagged Port