This is my setup.
2 Cisco 7K's as vPC Peers
SPAN port on each 7K
with SOURCE as Port-Channels and Vlans
with DESTINATION as Gigamon GV-HC2
HC2 is using Deduplication
CAS and AMD do not report any Vlans
Let me know if you need any additional information.
Thanks and God bless,
Provided your setup doesn't strip the vlan tags you can enable the monitoring in the global AMD config under Global>General and selecting Enable Layer 2 data generation
You should then be able to view the data in the CAS using the "Layer 2 data" data view in DMI.