Setting this action object to clear(2) resets this path's lifetime AIS and RFI counters back to zero. An operator typically does this only after a major, confirmed repair (like replacing a card) so that the lifetime counters going forward represent the new hardware's history rather than carrying forward years of accumulated events from before the fix. After swapping the SONET line card that had accumulated 340 lifetime AISs due to a failing clock circuit, clearing this gives the replacement card a clean lifetime count of 0 to start tracking from.