Does RHEL support VLAN tags inside VLAN tags, also called QinQ or 802.1ad ?

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Issue

Does RHEL support 802.1q VLAN tags inside VLAN tags, also called QinQ, Q-in-Q, Stacked VLANs, provider bridging, or 802.1ad ?
Please provide some information as to the status of "QinQ" support in the RHEL kernel and tools.
http://en.wikipedia.org/wiki/802.1QinQ

Environment

Red Hat Enterprise Linux 6

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