Fortinet 548B - Manual (Page 651)

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11.2.6.6 Configuring Double VLAN Tunneling Function Page
Selection Criteria
Slot/Port - Select the physical interface for which you want to display or configure data.
Configurable Data
Interface Mode - This specifies the administrative mode via which Double VLAN Tagging can be
enabled or disabled. The default value for this is Disabled.
Interface EtherType - The two-byte hex EtherType to be used as the first 16 bits of the DVlan tag.

802.1Q Tag - Commonly used tag representing 0x8100

vMAN Tag - Commonly used tag representing 0x88A8

Custom Tag - Configure the EtherType in any range from (0 to 65535)
Command Buttons
Submit - Update the switch with the values on this screen. If you want the switch to retain the new
values across a power cycle, you must perform a save.