How to divide/halve traffic

[philfry]

I'm trying to use SNMP to keep track of traffic on my Airport Extreme/Time Capsule from Apple. There is a known SNMP bug that doubles traffic. Is there a good way in cacti to compensate for this? For now I made a CDEF that halves the total bandwidth but that won't fix the graph. Any ideas?

[gandalf]

CDEF is the correct approach. The CDEF should eb applied to the graph items that graph the traffic usage
R.