Observer nTAPs : Observer nTAPs : FAQ : VLAN tags not visible at the analyzer
VLAN tags not visible at the analyzer
All TAPs pass VLAN tags with the packets. If you are not seeing the VLAN tags at the analyzer, check the following:
On the switch:
Confirm that the SPAN was created to pass VLAN tags. Sometimes SPANs are created and passing VLAN tags is not enabled.
Confirm the communication between the switch and the router is passing the VLAN tags (normally the communication between them is not a trunk).
On a GigaStor, if you are using one:
Confirm the capture card has been enabled to receive or pass VLAN tags.