Port-Based Vlan - HP 1910 User Manual

Port-based VLAN

Port-based VLANs group VLAN members by port. A port forwards traffic for a VLAN only after it is
assigned to the VLAN.
Port link type
You can configure the link type of a port as access, trunk, or hybrid. The link types use the following
VLAN tag handling methods:
An access port belongs to only one VLAN and sends traffic untagged. It is usually used to connect
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a terminal device unable to identify VLAN tagged-packets or when separating different VLAN
members is unnecessary.
A trunk port can carry multiple VLANs to receive and send traffic for them. Except traffic from the
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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.
• A hybrid port allows traffic of some VLANs to pass through untagged and traffic of some other
VLANs to pass through tagged. Hybrid ports can interconnect network devices or connect to
terminals.
PVID
By default, VLAN 1 is the PVID for all ports. You can change the PVID for a port as required.
Use the following guidelines when you configure the PVID on a port:
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.
• 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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After you delete the VLAN that an access port resides in, the PVID of the port changes to VLAN 1.
Deleting the VLAN specified as the PVID of a trunk or hybrid port, however, does not affect the PVID
setting on the port.
NOTE:
• Do not set the voice VLAN as the PVID of a port in automatic voice VLAN assignment mode. For
information about voice VLAN, see
HP recommends that you set the same PVID for local and remote ports.
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Make sure that a port permits its PVID. Otherwise, when the port receives frames tagged with the PVID
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or untagged frames, the port drops these frames.
Frame handling methods
The following table shows how ports of different link types handle frames:
Actions
In the inbound
direction for an
untagged frame
"Configuring a voice
Access
Tags the frame with the
PVID tag.
VLAN."
Trunk
Checks whether the PVID is permitted on the port:
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If yes, tags the frame with the PVID tag.
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If not, drops the frame.
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Hybrid