Troubleshoot SNMP communications issues

Question

What is SNMP? What are the basic SNMP components? How SNMP Works and How SNMP communication happens? How can I troubleshoot my SNMP communications issues?

Answer 1

The first 3 questions can be answered with a google search of "snmp". This page on wikipedia is a good starting point.

The last question is more interesting, and really depends on what the problem is. The most common issue is connectivity between SNMP agent and management app:

1. Can you ping it? If not, resolve that, google "cannot ping".
2. Does it respond to ANY request? If not, try a packet analyser such as wireshark otherwise google "cannot snmpwalk"

Anything else is problem-specific and can probably be googled.