Alcatel Carrier Internetworking Solutions Omni Switch/Router - Manual (Page 555)

Mobile Groups
Page 19-13
By default the def_group variable is Enabled. If you want to disable it (devices that do not
meet criteria for mobile group membership will not be part of any mobile group), then
you need to indicate that choice at this prompt. The prompt will always show the current
status of def_group and then ask if you want to change that status. If you want to change
the current status, then enter a
y at this prompt and press <enter> . To keep the current
status, simply press <enter> .
The move_from_def Variable
The move_from_def variable controls whether or not a port’s primary group can differ
from the port’s default mobile group. This variable is enabled by default, but can be
changed to disabled in the
mpx.cmd file.
The original default group for a port is group 1 or the group to which the port is assigned
through the
crgp or addvp commands. The primary group at this point is the same as the
default group. However, if the move_from_def variable is enabled, the primary group can
change as soon as a device on the port matches the policy criteria for another mobile
group.
For example, Port 5 may start out in Group 1, its default group. The primary group in this
case will also be Group 1. If the move_from_def variable is enabled and Port 5 matches
AutoTracker polices for mobile group 3, then the new primary group for Port 5 will be
Group 3. All further Spanning Tree operations for the port will converge on group 3
rather than group 1. The effects of the move_from_def variable are further illustrated
though diagrams on page 19-10.
If you disable the move_from_def variable, then the primary group for a port will always
match the default group regardless of the number of other mobile groups to which it
gains membership. To disable the move_from_def variable, enter the following statement
in the
mpx.cmd file
move_from_def=0
For this new setting to take place you need to reboot the switch.