Technical data

BLADE OS 5.1 Application Guide
BMD00136, November 2009 Chapter 3: VLANs
 59
Port-Based vs. Protocol-Based VLANs
Each VLAN supports both port-based and protocol-based association, as follows:
 The default VLAN configuration is port-based. All data ports are members of VLAN 1, with no
PVLAN association.
 When you add ports to a PVLAN, the ports become members of both the port-based VLAN and
the PVLAN. For example, if you add port 1 to PVLAN 1 on VLAN 2, the port also becomes a
member of VLAN 2.
 When you delete a PVLAN, it’s member ports remain members of the port-based VLAN. For
example, if you delete PVLAN 1 from VLAN 2, port 1 remains a member of VLAN 2.
 When you delete a port from a VLAN, the port is deleted from all corresponding PVLANs.
PVLAN Priority Levels
You can assign each PVLAN a priority value of 0-7, used for Quality of Service (QoS). PVLAN
priority takes precedence over a port’s configured priority level. If no priority level is configured for
the PVLAN (priority = 0), each port’s priority is used (if configured).
All member ports of a PVLAN have the same PVLAN priority level.
PVLAN Tagging
When PVLAN tagging is enabled, the switch tags frames that match the PVLAN protocol. For
more information about tagging, see “VLAN Tagging” on page 50.
Untagged ports must have PVLAN tagging disabled. Tagged ports can have PVLAN tagging either
enabled or disabled.
PVLAN tagging has higher precedence than port-based tagging. If a port is tag enabled, and the port
is a member of a PVLAN, the PVLAN tags egress frames that match the PVLAN protocol.
Use the tag list command (protocol-vlan <x> tag-pvlan) to define the complete list of
tag-enabled ports in the PVLAN. Note that all ports not included in the PVLAN tag list will have
PVLAN tagging disabled.