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Assigning Ports to VLANs Dynamically Assigning Ports to VLANs

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 7-11

Enabling/Disabling Port Mobility

To enable mobility on a port, use the vlan port mobile command. For example, the following command

enables mobility on port 1 of slot 4:

-> vlan port mobile 4/1

To enable mobility on multiple ports, specify a range of ports and/or multiple slots.

-> vlan port mobile 4/1-5 5/12-20 6/10-15

Use the no form of this command to disable port mobility.

-> vlan no port mobile 5/21-24 6/1-4

Only Ethernet and gigabit Ethernet ports are eligible to become mobile ports. If any of the following

conditions are true, however, these ports are considered non-mobile ports and are not available for

dynamic VLAN assignment:

• The mobile status for the port is disabled (the default).

• The port is an 802.1Q tagged port.

• The port belongs to a link aggregate of ports.

• Spanning Tree is active on the port and the BPDU ignore status is disabled for the port. (See “Ignoring

Bridge Protocol Data Units (BPDU)” on page 7-11 for more information.)

• The port is configured to mirror other ports.

Note. Mobile ports are automatically trusted ports regardless of the QoS settings. See Chapter 26,

“Configuring QoS,” for more information.

Use the show vlan port mobile command to display a list of ports that are mobile or are eligible to

become mobile. For more information about this command, see the OmniSwitch CLI Reference Guide.

Ignoring Bridge Protocol Data Units (BPDU)

By default, ports that send or receive Spanning Tree Bridge Protocol Data Units (BPDU) are not eligible

for dynamic VLAN assignment. If the switch sees BPDU on a port, it does not attempt to classify the

port’s traffic. The vlan port mobile command, however, provides an optional BPDU ignore parameter. If

this parameter is enabled when mobility is enabled on the port, the switch does not look for BPDU to

determine if the port is eligible for dynamic assignment.

When BPDU ignore is disabled and the mobile port receives a BPDU, mobility is shut off on the port and

the following occurs:

• The Switch Logging feature is notified of the port’s change in mobile status (see Chapter 30, “Using

Switch Logging,” for more information).

• The port becomes a fixed (non-mobile) port that is associated only with its configured default VLAN.

• The port is included in the Spanning Tree algorithm.

• Mobility remains off on the port even if the port’s link is disabled or disconnected. Rebooting the

switch, however, will restore the port’s original mobile status.

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