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Chapter 10
Application on Virtual LAN
10.5
Tagged VLAN with legacy (untagged) VLAN support
In most scenarios, there are legacy-networking devices that do not support 802.3Q Tagged
VLAN. To accommodate such devices, tagged VLANs are normally inapplicable. However,
Compex SGX3226 has provision for legacy device support. It allows an untagged VLAN or
device to join the tagged VLAN while work together as in a tagged VLAN application.
10.5.1
Legacy Device – VLAN Support
The example below shows the switch in a backbone application. Workstation 1 is a
legacy device, which do not support VLAN tagging. There is also an untagged VLAN
connecting the hub to port 7 of the switch. Other devices would support 802.3Q Tagged
VLAN. The commands build two tagged VLANs (Workstation on Port 2) and an
untagged VLAN (hub on Port 7). The switch would tag and un-tag the data such that
data flowing into Port 7 would be tagged with a VLAN ID of '3' while data flow out of
it would be untagged that the legacy VLAN would recognize it.
NOTE
The VLAN configuration shown above would be impossible to implement
with untagged VLAN.
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Figure 10.5-1
Legacy Device – VLAN Support
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