1 Using the
movemanagement
command, move the manager to the desired unit number. The
operation may take three minutes or longer depending on the stack size and configuration. The
command, in Config Stack mode, is
movemanagement fromunit-id tounit-id
.
2 Make sure that you can log in on the console attached to the new manager. Use the
show switch
command to verify that all units rejoined the stack.
3 We recommend that the stack be reset with the
reload
command in Privileged EXEC mode after
moving the manager.
Removing a Manager Unit from an Operating Stack
Use the following steps to remove the manager unit from the stack during operation:
1 Move the designated manager to a different unit in the stack by following the steps in
Manager to a Different Unit in the Stack
on page 30.
2 Remove the unit from the stack by following the steps in
Removing a Unit from the Stack
29.
Initiating a Warm Failover of the Manager Unit
You can use the
initiate failover
command to initiate a "warm" restart. This command reloads
the management unit, triggering the standby unit to take over. As the standby management unit takes
over, the system continues to forward end-user traffic. The end-user data streams may lose a few
packets during the failure, but they do not lose their IP sessions, such as VoIP calls.
If there no standby unit is available when the initiate failover command is issued, the command fails
with an error message stating that no standby unit exists. If the standby unit is not ready for a warm
restart, the command fails with a similar error message. The
move management
command triggers a
cold restart, even if the target unit is the backup unit.
Merging Two Operational Stacks
We recommend using the following procedure for merging two operational stacks:
1 Always power off all units in one stack before connecting to another stack.
2 Add the units as a group by unplugging one stacking cable in the operational stack and physically
connecting all unpowered units.
3 Completely cable the stacking connections, making sure the redundant link is also in place.
Two operational stacks can also be merged by reconnecting stack cables without powering down all
units in one stack. Connecting a powered-up standalone unit to an existing stack leads to same
behavior as when merging two operational stacks. In such cases, the Manager re-election is done based
on the rules listed in
Stack Manager Election and Re-Election
on page 25. One of the two managers
wins the election and the losing stack manager resets itself and all its member units. After the reset, all
the losing stack members join the winning stack to form a single stack. The winning stack remains
functional through the merge process. If the stack merge is performed in this way, then we strongly
recommend setting the priority of the desired winner stack manager to a higher value than the stack
manager that should lose the election.
Getting Started with Stacking
ExtremeSwitching 200 Series: Administration Guide
31
