In Chapter 7, Network Monitoring with Python – Part 1, we used SNMP to query information from network devices. We did this by using an SNMP manager to query the SNMP agent residing on the network device. The SNMP information is structured in a hierarchy format with a specific object ID as the way to represent the value of the object. Most of the time, the value we care about is a number, such as CPU load, memory usage, or interface traffic. It's something we can graph against time to give us a sense of how the value has changed over time.
We can typically classify the SNMP approach as a pull method as we are constantly asking the device for a particular answer. This particular method adds burden to the device because it needs to spend a CPU cycle on the control plane to find answers from the subsystem, package the answer...
