In this paper, we propose a 6 type items model of Green-oriented Management Information Base (G-MIB) to monitor the network device status and aim it for standardization in IETF. The G-MIB has versatility and is easy to implement. Thus, the G-MIB has attracted attention in IETF meeting held at Orland in March 2013. Based on the G-MIB, we have been investigating a Green-oriented Network Management Framework to realize an energy-saving network system even without using power consumption monitoring device such as a smart tap (a power strip with a function to measure power consumptions). It monitors connection status of network device based on network management technology and detects power consumption of each device based on network connectivity in real time.