Q in Q

[adminseveni]

 i have a L2 connection provided by the ISP ( most probably they are using q and  q...) they have given vlan on both sides. I have configured the vlan and i am able to ping from Router A to Router B. 

             What i want is to pass different vlans over this links. You can say sub interfaces under sub-interface.  Please let me know if this is possible .

[a.alekseev]

Does you router support double tagging?

[adminseveni]

i have cisco 7206 router. with one main fiber link terminating in it which is provided by ISP. And separate vlan for each of my branches.....

[Joseph W. Doherty]

Not sure about what a 7206 support for Q-in-Q, it's often more a feature of MetroE switches. (I suspect it might not.)

It's been a long while since I last configured such, but I recall you tell the interface its Q-in-Q and identify the VLAN being used with the provider (which I also recall can even be a VLAN number you're using internally, but the provider VLAN and your internal VLAN of the same number don't mix). All your VLANs are then just effectively trunked across the Q-in-Q path.