I run MRTG to monitor my internal network stats:
http://www.mjburton.com/monitoring-network-traffic-with-mrtg/
However, I had been manually editing the cfgmaker produced file to show interfaces (ports) that were ‘down’ at the point of running the config maker.
I migrated to a new switch so, decided to read the manual.
cfgmaker --show-op-down .........
Works a treat and now all interfaces are displayed.