Any MEP has received a TST PDU and the validation criteria has failed A notification is sent to the management entity with the OID of the MEP that has received the TST PDU. If a invalid TST PDU is received after a notification has been sent, another notification is issued. The management entity receiving the notification can identify the system from the network source address of the notification, and can identify the MEP reporting the invalid TST PDU by the indices in the OID of the each element of trap variable except fsMIY1731ContextName in the notification: fsMIY1731MegIndex - Also the index of the MEP's Maintenance Entity Group entry (fsMIY1731MegTable). fsMIY1731MeIndex - Also an index (with the MEG table index) of the MEP's Maintenance Entity table entry (fsMIY1731MeTable). fsMIY1731MepIdentifier - MEP Identifier and final index into the MEP table (fsMIY1731MepTable).