Manual Chapter : About double tagging

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BIG-IP Analytics

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Manual Chapter

About double tagging

For BIG-IP systems with ePVA hardware support, the system includes support for the IEEE 802.1QinQ standard. Known informally as
Q-in-Q
or
double tagging
, this standard provides a way for you to insert multiple VLAN tags into a single frame. This allows you to encapsulate single-tagged traffic from disparate customers with only one tag.
Double tagging expands the number of possible VLAN IDs in a network. With double tagging, the theoretical limitation in the number of VLAN IDs expands from 4096 to 4096*4096.
When you implement double tagging, you specify an
inner tag
that encapsulates all of the single-tagged traffic. You then designate all other tags as
outer tags
, or
customer tags
(C-tags), which serve to identify and segregate the traffic from those customers.
A common use case is one in which an internet service provider creates a single VLAN within which multiple customers can retain their own VLANs without regard for overlapping VLAN IDs. Moreover, you can use double-tagged VLANs within route domains or vCMP guests. In the latter case, vCMP host administrators can create double-tagged VLANs and assign the VLANs to guests, just as they do with single-tagged VLANs. For a vCMP guest running an older version of the BIG-IP software, double-tagged VLANs are not available for assignment to the guest.
On systems that support double tagging, if you configure a Fast L4 local traffic profile, you cannot enable Packet Velocity Asic (PVA) hardware acceleration.