HP 3100 Series Configuration Manual page 117

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An access port belongs to only one VLAN and sends traffic untagged. It is usually used to
connect a terminal device unable to identify VLAN tagged-packets or when separating different
VLAN members is unnecessary.
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A trunk port can carry multiple VLANs to receive and send traffic for them. Except traffic from
the port VLAN ID (PVID), traffic sent through a trunk port will be VLAN tagged. Usually, ports
that connect network devices are configured as trunk ports.
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Like a trunk port, a hybrid port can carry multiple VLANs to receive and send traffic for them.
Unlike a trunk port, a hybrid port allows traffic of all VLANs to pass through VLAN untagged. You
can configure a port connected to a network device or user terminal as a hybrid port.
PVID
By default, VLAN 1 is the PVID for all ports. You can configure the PVID for a port as required.
When you configure the PVID on a port, use the following guidelines:
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An access port can join only one VLAN. The VLAN to which the access port belongs is the PVID
of the port.
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A trunk or hybrid port can join multiple VLANs. You can configure a PVID for the port.
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You can use a nonexistent VLAN as the PVID for a hybrid or trunk port but not for an access
port. After you use the undo vlan command to remove the VLAN that an access port resides in,
the PVID of the port changes to VLAN 1. The removal of the VLAN specified as the PVID of a
trunk or hybrid port, however, does not affect the PVID setting on the port.
When you configure a PVID, follow these guidelines:
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Do not set the voice VLAN as the PVID of a port in automatic voice VLAN assignment mode.
For information about voice VLAN, see "Configuring a voice VLAN."
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Hewlett Packard Enterprise recommends that you set the same PVID ID for local and remote
ports.
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Make sure that a port permits the traffic from its PVID to pass through. Otherwise, when the port
receives frames tagged with the PVID or untagged frames, the port drops these frames.
The following table shows how ports of different link types handle frames:
Port type
Access
Actions (in the inbound direction)
Untagged frame
Tags the frame with the
PVID tag.
Tagged frame
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Receives the frame if its
VLAN ID is the same as
the PVID.
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Drops the frame if its
VLAN ID is different from
the PVID.
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Actions (in the outbound
direction)
Removes the VLAN tag and
sends the frame.