From my notes ..
See if its still valid
MIB: CISCO-SLB-EXT-MIB:cslbxFtState.9
OID: 1.3.6.1.4.1.9.9.254.1.10.1.1.7.9
The last digit is the slot where the CSM module is installed.
Possible Return Values:
1 means not configured
2 means Initializing
3 means Active
4 means Standby
Thanks
Syed Iftekhar Ahmed