check whether VLAN tagging is enabled:
From the Windows desktop,
go to the Systems Tray. Right-click on the Network Connection
or NIC icon and select Open
Within the Network
Connections window, right-click on the appropriate
network connection and select Properties.
In the Properties Window,
verify that the appropriate network card is selected and
You should be able to
select the Advanced tab, which displays all properties and options
available for your network adapter. Within this Window,
youíll want to identify the function that needs to be
enabled to allow VLAN tags to pass to Observer. The
function name varies based upon the card manufacturer.
Intel refers to the feature as QoS Packet Tagging, but it might also be called
802.1p/q, QoS, or ToS
Select the feature, verify itís enabled, and click Ok.
Once youíve enabled the
NIC, verify that your TAP or SPAN Port is set up
correctly to feed Observer the tags. Be sure you have
connected to a port that contains VLAN tags. Read more about configuring your
Cisco switch to retain VLAN tags.
With this completed, you should be able to see VLAN
information within Decode or by selecting Statistics and VLAN Statistics. If set up incorrectly, rather
than displaying the VLAN number, the VLAN column will
indicate No VLAN.