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Troubleshooting a VLAN Mobility Failure Troubleshooting Group Mobility
page 9-2 OmniSwitch Troubleshooting Guide September 2005
Troubleshooting a VLAN Mobility Failure
There is no systematic procedure to troubleshoot a VLAN mobility issue. This section will give you a
checklist, with a generally best course of action to take to determine the source of the VLAN mobility fail-
ure.
1 Verify that port mobility has been turned on for a given port and is still active.
2 Determine VLAN rules.
3 Determine mobile port membership.
4 Verify Traffic on a mobile port.
5 Correct rules, or move devices appropriately.
In general, the above steps are a good guideline for determining what is causing mobile port(s) to join
incorrect VLAN(s) or to not join any VLAN(s). Most likely, all troubleshooting steps will not be needed.
After each step in the troubleshooting process, determine if a configuration modification is necessary, and
make any needed corrections.
Note that mobility is different in AOS products when compared to legacy XOS products. The newer AOS
products implement mobility on the port level. There is no longer the concept of having a “mobile group”
as there was in the legacy XOS.
For dynamic assignment of a port to a VLAN, port mobility must be enabled on a given port. To deter-
mine if port mobility is enabled for given port, issue the show vlan port mobile CLI command, or for a
specific port, use the show vlan port mobile CLI command with the slot/port option. If port mobility has
not been enabled, use the show vlan port mobile CLI command to enable it. All variables in this output
are important to understand if there are problems with group mobility. (See below for an example of this
command.)
• Verify the feature is enabled ON for this port. The default is OFF.
• If mobile is on and the feature appears to still not be working, understand that if ignore BPDU is off,
and the port is an interswitch connection, the arrival of a BPDU will turn mobility off on the port.
• If traffic is not passing on the default vlan, verify that it is configured to the correct vlan and that
Default Vlan is enabled. If it is not enable, only traffic matching a specific rule will pass.
• If there is a device such as a printer, that only sources traffic when it boots, it may be advantageous to
turn off default VLAN restore.
Note. OS-6600 supports only one rule per port. One port can only become a member of one rule unlike
OS-7700/7800/8800, which support multiple rules per port. Hubs are also not supported on a mobile port.
-> show vlan port mobile 6/1-3
Mobility : on,
Config Default Vlan: 1,
Default Vlan Enabled: on,
Default Vlan Restore: on,
Authentication : off,
Ignore BPDUs : off