We'll specifically look at the high-end routers, such as the 7x00 series, since that is where most, if not all the environmental characteristics are reported. Tables 10-6 through 10-13 summarize the environmental specifications (temperature and voltages) of each router type (7500 series and 7200 series). Subsequent sections look at the MIBs and data points to monitor for those values.
The router also reports fan status messages, but we will not go into those messages specifically because you'll start to see a pattern in the voltages and temperature monitoring. You can apply the same methodology to the fan status.