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Figure 5 Port link types
PVID
You can configure a port VLAN (PVID) for a port. By default, VLAN 1 is the PVID for all ports.
An access port can join only one VLAN. The VLAN to which the access port belongs is the PVID of
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the port. The PVID of the access port changes along with the VLAN to which the port belongs.
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A trunk or hybrid port can join multiple VLANs, and you can configure a PVID for the port.
You can use a nonexistent VLAN as the PVID for a hybrid or trunk port but not for an access port.
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Therefore, after you remove the VLAN that an access port resides in with the undo vlan command,
the PVID of the port changes to VLAN 1. The removal of a VLAN specified as the PVID of a trunk or
hybrid port, however, does not affect the setting of the PVID on the port.
NOTE:
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It is recommended that you set the same PVID for the local and remote ports.
Make sure that a port is assigned to its PVID. Otherwise, when receiving frames tagged with the PVID or
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untagged frames (including protocol packets such as MSTP BPDUs), the port filters out these frames.
Ports of different link types handle frames as follows:
Port type
Access
Actions (in the inbound direction)
Untagged frame
Tag the frame with the
PVID tag.
Tagged frame
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Receive the frame if its
VLAN ID is the same as the
PVID.
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Drop the frame if its VLAN
ID is different from the
PVID.
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Actions (in the outbound
direction)
Remove the VLAN tag and send
the frame.
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