The Maintenance Operation Protocol (MOP) is used for utility services such as uploading and downloading system software, remote testing and problem diagnosis. It was a proprietary protocol of Digital Equipment Corporation. MOP frames can be one of the following commands:
Command Description [memory load data] Contains memory load data.[mem load request] Request for memory load segment.[mem load w/addr] Memory load with transfer address.[par load w/addr] Parameter load with transfer address.[dump service req] Request for assistance with dump operation.[mem dump request] Request for next memory dump segment.[memory dump data] Contains memory dump data.[dump completed] Acknowledgment of dump completion.[volunteer assist] Offer of dump/load/loop assistance.[request program] Request for system or loader program.[rem boot request] Request for boot program.[remote ID reqst] Request for remote console identification.[remote system ID] Remote console identification information.[counters request] Request for communication information counters.[counters reply] Communication information counters.[reserve console] Remote console in reserved state.[release console] Release of remote console from reserved state.[rem console poll] Poll of remote console for status.[rem console rply] Response to remote console poll.[loopback request] Request to loopback enclosed data.[loopback reply] Response to loopback request with data.
See also Reverse Address Resolution Protocol (RARP)
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