L3 interfaces with double-tagging

Vitor Mazali · ‎07-24-2013

Gentlemen,

I have a scenario where I need to include lots of VLANs in another VLAN tag, in order to keep trafic from different customers separated and avoid spanning-tree limitation.

It should looks like this:

Customer Switch (any VLAN) >>> (Inner VLAN) Aggregation Switch (Outer VLAN+Inner VLAN) >>> Router (L3 aggregation)

Does anyone has any thought about the configuration on router?

Is it possible use subinterfaces with dot1q and second-dot1q?

Any other ideas are appreciated

Kind regards,

Vitor

Peter Paluch · ‎07-24-2013

Hi Vitor,

Is it possible use subinterfaces with dot1q and second-dot1q?

Yes, absolutely, it is possible. What services do you expect from the router, i.e. what do you expect the router to do for individual outer/inner VLAN combinations?

Best regards,

Peter

Vitor Mazali · ‎07-24-2013

Hi Peter,

Thanks for answering.

The router should act as the default gateway for each customer and announce their prefixes to our edge routers using OSPF. That would be a way to allowed more clients aggregated.

Kind regards,

Vitor.