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Stacking Two 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 push two VLAN tags in front of tagged frames entering or exiting the interface, include the push-push statement in the input VLAN map or the output VLAN map:

You can include this statement at the following hierarchy levels: