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Rewriting the Inner and Outer VLAN Tags

On Ethernet IQ, IQ2 and IQ2-E interfaces, on MX Series router Gigabit Ethernet, Tri-Rate Ethernet copper, and 10-Gigabit Ethernet interfaces, and on aggregated Ethernet interfaces using Gigabit Ethernet IQ2 and IQ2-E or 10-Gigabit Ethernet PICs on MX Series routers, to replace both the inner and the outer VLAN tags of the incoming frame with a user-specified VLAN tag value, include the swap-swap statement in the input VLAN map or output VLAN map: The stacked and rewriting Gigabit-Ethernet VLAN Tags are also referred to as Q-in-Q tunneling.

You can include this statement at the following hierarchy levels: