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R2511-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V5)

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to transmit packets of VLAN 2 and VLAN 3, and you must configure the ports interconnecting
Device A and Device B as trunk ports and assign them to VLAN 2 and VLAN 3.
• Hybrid port—A hybrid port allows traffic of some VLANs to pass through untagged and traffic of
some other VLANs to pass through tagged. Usually, hybrid ports are configured to connect devices
whose support for VLAN-tagged packets you are uncertain about. As shown in Figure 5, D
evice C
connects to a small-sized LAN in which some PCs belong to VLAN 2 and other PCs belong to VLAN
3, and Device B is uncertain about whether Device C supports VLAN-tagged packets. On Device
B, configure the port connecting to Device C as a hybrid port to allow packets from VLAN 2 and
VLAN 3 to pass through untagged.
Figure 5 Network diagram
PVID
By default, VLAN 1 is the port VLAN ID (PVID) for all ports. You can configure the PVID for a port as
required.
When you configure the PVID on a port, follow these restrictions and guidelines:
• An access port can join only one VLAN. The VLAN to which the access port belongs is the PVID of
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.
After you use the undo vlan command to remove the VLAN where an access port resides, 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.
• 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."
• HP recommends that you set the same PVID for local and remote ports.
• 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.
VLAN 2
VLAN 3
VLAN 2
VLAN 3
Access links are required
Trunk links are reuqired
Hybrid links are required
Device A
Device B Device C