librenms/doc/General/MIB-based-polling.md

The overall design of MIB-based support is:

Discovery:

• MIBs are not involved; any work done here would have to be duplicated by the poller and thus would only increase load.

Polling:

• Look for a MIB matching sysObjectID in the MIB directory; if one is found:
  • parse it
  • walk that MIB on the device
  • store any numeric results in individual RRD files
  • update/add graph definitions in the database
• Individual OSes (includes/polling/os/*.inc.php) can poll extra MIBs that should be there for a given OS by calling poll_mib().
• Devices may be excluded from MIB polling by adding poll_mib = 0 to devices_attribs (see /device/device=ID/tab=edit/section=modules/)

Graphing:

• For each file in the device directory, create a graph using the definition in the database. Future enhancements:
  • Allow graphs to go in different sections
  • Allow graphs to be combined automatically or on a user-defined basis.