220.127.116.11 Notify Retransmission Timer
The notify retransmission timer is started by the initiator or the responder when it sends a Notify payload within a message. Upon expiration of this timer, the initiator MUST retransmit the Notify payload and increment the retransmission counter. After 7 retransmissions, the initiator MUST delete the state for the corresponding main mode security association (MM SA). During AuthIP shutdown, however, the delete notification messages (section 18.104.22.168) are retransmitted at most once if not acknowledged.