When transmitting VLAN tagged networks via provider networks that use VLAN themselves, providers sometimes use special VLAN tagging IDs. In order for VLAN transmission to allow for this, the Ethernet2 type of the VLAN tag can be set as a 16-bit hexadecimal value as tag value. The default is 8100 (802.1p/q VLAN tagging) other typical values for VLAN tagging could be 9100 or 9901.
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