User guide

Managing CMM Directory Content Managing Redundancy in a Stack and CMM
OmniSwitch 6250/6450 Switch Management Guide May 2012 page 5-29
Swapping the Primary CMM for the Secondary CMM
If the primary CMM is having problems, or if it needs to be shut down, then the secondary CMM can be
instructed to “take over” the switch operation as the primary CMM is shut down.
Note. It is important that the software for the secondary CMM has been synchronized with the primary
CMM before you initiate a secondary CMM takeover. If the CMMs are not synchronized, the takeover
could result in the switch running old or out-of-date software. Synchronizing the primary and secondary
CMMs is described in “Synchronizing the Primary and Secondary CMMs” on page 5-27.
To instruct the secondary CMM to takeover switch functions from the primary CMM, enter the following
command at the prompt:
-> takeover
The takeover command is described in detail in the OmniSwitch 6250/6450 CLI Reference Guide.
In a stack with three or more switches, the secondary CMM takes over as primary and the original primary
becomes “idle.” The next available idle switch becomes the new secondary CMM. For more information
on stacks, see the “Managing Stacks” chapter found in the OmniSwitch 6250/6450 Hardware Users
Guide.
Note. The saved boot.cfg file is overwritten if the takeover command is executed after the
copy running-config working or write memory command on an OmniSwitch 6250, 6450 switch set up
with redundant CMMs.