This research proposes an identification method of sensor reactions using the Internet standard protocol: Simple Network Management Protocol (SNMP) in sensor networks. We have developed Optical Sensory Nerve network (OSN) with optical fiber sensors in order to solve issues on electricity and communication limitations in wireless sensor networks. Although OSN has used a commercial device with SNMP functions to detect the sensor reactions in previous research, there are issues about limited performance scalability. This paper describes SNMP Agent software using the protocol and examines whether the software can expand a scale of the OSN application.