Double Tagging (QinQ)
Double tagging, or Q in Q is also known as hierarchical VLANs which is the reference used in the MAP. HVLANs can be applied to any port, but the HVLAN vids must not overlap with normal VLAN vids.
officer SEC>> create hvlan Customer1 vid 100
officer SEC>> create hvlan Customer2 vid 200
officer SEC>> add hvlan 100 int x.y
officer SEC>> add hvlan 200 int a.b
officer SEC>> set int x.y tagall
officer SEC>> set int a.b tagall
officer SEC>> set int 10.0 tpid 8100 (9100)