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All untagged traffic and tagged traffic with a null VLAN ID are assumed to belong to the port default PVID.
A packet with a VLAN ID equal to the outgoing port default PVID is sent untagged. All other traffic is sent with a VLAN tag.
All received packets are expected to be encapsulated and all transmitted packets are sent with this header.
This is no longer a recommended trunk port mode, and it is not supported on a number of Cisco switches.
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