I think you are looking for this option to update LMS when DNS hostname changes for devices occure:
make a backup of the following file and change this two option as follows:
NMSROOT/campus/etc/cwsi/DeviceDiscovery.properties
nameserver.updateDCRDisplayName=true
nameserver.updateDomainNameSuffix=true
restart the processes and it should work
(windows: net stop crmdmgtd / net start crmdmgtd
solaris: /etc/init.d/dmgtd stop [start]
)
HTH
MArtin