Comtrend Corporation NexusLink 3120 User Manual page 206

F2.6 PPP over ETHERNET (PPPoE) – IPv6
STEP 1: *Select the PPP over Ethernet radio button. Then select IPv6 only from
the drop-down box at the bottom off the screen and click Next.
*
For tagged service, enter valid 802.1P Priority and 802.1Q VLAN ID.
For untagged service, set -1 to both 802.1P Priority and 802.1Q VLAN ID.
Select a TPID if VLAN tag Q-in-Q is used.
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