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L3 interfaces with double-tagging

Vitor Mazali
Beginner
Beginner

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

2 Replies 2

Peter Paluch
Hall of Fame Cisco Employee Hall of Fame Cisco Employee
Hall of Fame Cisco Employee

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

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.

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