FAQ:Coding 21

What if I'm using an AgentX sub-agent instead?

This is done in exactly the same manner as with the main SNMP agent. Calling one of the routines described in 'snmp_trap_api(3)' will cause the AgentX sub-agent to send a notification to the master agent, which will then pass this on to the configured trap destination(s).

One of the original design aims of the Net-SNMP AgentX support was that the agent (or subagent) framework should be transparent to a MIB module implementer. The interface between the agent framework and a MIB module should be independent of the protocol used to receive the original request. So the exact same MIB module code could be used within a traditional SNMP-only agent, or an AgentX subagent, with no changes needed.

This also holds for sending traps.

   FAQ:Coding
   

1. How do I write C code to integrate with the agent?
2. How does the agent fetch the value of a MIB variable from the system?
3. Mib2c complains about a missing "mib reference" - what does this mean?
4. Mib2c complains about not having a "valid OID" - what does this mean?
5. Why doesn't mib2c like the MIB file I'm giving it?
6. Mib2c ignores my MIB and generates a pair of 'mib-2' code files. Why?
7. What's the difference between the various mib2c configuration files?
8. Which mib2c configuration file should I use?
9. How can I have mib2c generate code for both scalars and tables?
10. Are there any examples, or documentation for generating MIB modules?
11. Where should I put the files produced by 'mib2c'?
12. Why doesn't my new MIB module report anything?
13. Why does the iterator call my get_{first,next} routines so often?
14. How can I get the agent to generate a trap (or inform)?
15. How can I get an AgentX sub-agent to generate a trap (or inform)?
16. How can I get the agent to send an SNMPv1 (or SNMPv2c) trap?
17. How can I get the agent to include varbinds with an SNMPv1 trap?
18. How can I get the agent to send an SNMPv1 enterprise-specific trap?
19. How can I get the agent to send an SNMPv3 trap (or inform)?
20. Why does calling 'send_v2trap' generate an SNMPv1 trap (or vice versa)?
21. How can I register a MIB module in a different (SNMPv3) context?