The value of the object tmnxIsisLevelOverloadStatus indicates whether or not this level is in overload state. When tmnxIsisLevelOverloadStatus has the value 'notInOverload', the IS-IS level is normal state. When tmnxIsisLevelOverloadStatus has the value 'dynamic', the level is in the overload state because of insufficient memory to add additional entries to the IS-IS database for this level. When tmnxIsisLevelOverloadStatus has the value 'manual', the level has been put into the overload state administratively as a result of the isisSysSetOverload object in the ISIS-MIB having been set. When tmnxIsisLevelOverloadStatus has the value 'singleSfm', this level is in overload because there is only a single SFM functioning, while the value of the single-SFM-overload state (referred to as TIMETRA-VRTR-MIB::vRtrSingleSfmOverloadAdminState) is equal to 'inService' for this router instance. When tmnxIsisLevelOverloadStatus has the value 'fibAddFail', this level is in the overload state because adding routes to the FIB fails. When tmnxIsisLevelOverloadStatus has the value 'rtmAddFail', the level is in the overload state because adding routes to the RTM fails. When tmnxIsisLevelOverloadStatus has the value 'prefixLimit', the level is in the overload state because this ISIS instance reaches the configured maximum prefix limit.