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.
swap-swap;
You can include this statement at the following hierarchy levels:
[edit interfaces interface-name unit logical-unit-number input-vlan-map][edit interfaces interface-name unit logical-unit-number output-vlan-map][edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number input-vlan-map][edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number output-vlan-map]