One system creates an unsolicited update (UU) Network Management Data message (NMD) to transmit network management information to another system. In this case, the initiating system sends an NMD message as an unsolicited update (UU) containing network management information to a receiving system, which responds with a generic acknowledgement message (ACK).
For example, a system going down for backups (or starting up again after backups) might issue such a message to one or more applications. A system switching to another CPU or file-server may also need to use this transaction to notify other systems.
Chapter/
NMD Network Management Data Appendix
MSH Message Header 2
{
[NCK System Clock C
[{NTE}] Notes and Comments 2
]
[NST Statistics C
[{NTE}] Notes and Comments 2
]
[NSC Network Status Change C
[{NTE}] Notes and Comments 2
]
}
Chapter/
ACK Generic Acknowledgement Appendix
MSH Message Header 2
MSA Message Acknowledgement 2