A Group status is changed. A notification (DownUpAlarm)
is sent to the management entity with the OID of the Group
that has detected the status change.
          
The management entity receiving the notification can identify
the system from the network source address of the
notification, and can identify the Group reporting the status 
by the indices in the OID of the extremeCfmGroupStatus
variable in the notification:
          
   dot1agCfmMdIndex - Also the index of the MEP's
                      Maintenance Domain table entry
                      (dot1agCfmMdTable).
   dot1agCfmMaIndex - Also an index (with the MD table index)
                      of the MEP's Maintenance Association
                      network table entry
                      (dot1agCfmMaNetTable), and (with the MD
                      table index and component ID) of the
                      MEP's MA component table entry
                      (dot1agCfmMaCompTable).
   dot1agCfmMepIdentifier - MEP Identifier and final index
                      into the MEP table (dot1agCfmMepTable).
   extremeCfmGroupIndex -Group Identifier and final index
                      into the Group table (extremeCfmGroupTable).