Frank, looking through the MIB, I only see an option for extremeElrpVlanLoopDetected .1.3.6.1.4.1.1916.4.6.0.1 which is related to the ELRP trap.
ELRP can print-and-log which will log to the system log file and print to the console when ELRP packets are received back indicating detection of network loop. In turn, an alarm can be created in an NMS, based on match, for when this type of message in generated.