The value of vRtrIsisLevelOverloadStatus indicates whether or not this level is in overload state. When has the value 'notInOverload', the IS-IS level is normal state. When the value is '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 the value is '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 the value is '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.