During the first five minutes of system startup or nat-group activation, the system behaves as if all ISAs are operational. Consequently, ISAs are segmented in its members according to the configured maximum number of supported failures.
Upon expiration of this initial five minute interval, the system is re-evaluated. In case that one of more ISAs are found in faulty state during re-evaluation, the members of the failed ISAs are distributed to the remaining ISAs that are operational.