The value of tmnxSysRollbackIndex specifies a specific rollback checkpoint file to which a rollback action can be taken. The value of the tmnxSysRollbackIndex corresponds to a rollback checkpoint file with suffix .rb.index. The maximum checkpoint file that can be specified is determined by the rollback location as specified by tmnxSysRollbackLocation. If the location is on a compact flash, then the maximum value of tmnxSysRollbackIndex can be tmnxSysRollbackMaxLocalFiles minus 1. If the location is a remote ftp location, then the maximum value of tmnxSysRollbackIndex can be tmnxSysRollbackMaxRemoteFiles minus 1. This index is SET along with another action object, including tmnxSysRollbackStart to initiate a rollback revert of a file and tmnxSysRollbackFileDelete to delete a rollback file. An SNMP GET request on this object should return the last SET value.