Assigning Ports to VLANs Dynamically Assigning Ports to VLANs
OmniSwitch 6600 Family Network Configuration Guide April 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 10/100 Ethernet and gigabit ports are eligible to become mobile ports. If any of the following condi-
tions 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 Chapter24,
“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 deter-
mine 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 Chapter28, “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.