RME 4.1 and higher have a Netconfig reload template which will work over SNMP. If you don't have RME 4.1, you can do an SNMP Set operation and set tsMsgSend.0 (1.3.6.1.4.1.9.2.9.9.0) to 2. This requires that you have already configured "snmp-server system-shutdown" though.