Seems this is an old post. Few days ago I faced a similar problem.
There was the log message "%CFGMGR-4-SLAVE_WRITING_STARTUP_CFG: only master can do that" .
We're using C3750G-24T , the secondary switch seems hanging where is disconnects and connects back to the stack member. When its connecting back to the stack, then we're receiving the above log message.
csw3750x#sho log | inc only Mar 30 01:30:12.308: %CFGMGR-4-SLAVE_WRITING_STARTUP_CFG: only master can do that (csw3750x-2) Mar 30 01:30:12.308: %CFGMGR-4-SLAVE_WRITING_STARTUP_CFG: only master can do that (csw3750x-2) csw3750x#
Though switch 2 is not the master, it attempts to write the startup configuration. It seems the master is catching that and not allowing it to happen. That's great, but that switch 2 is trying to do this is a problem. Cisco: Will this be addressed?
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