Template:FAQ:Agent 38
From Net-SNMP Wiki
Unfortunately, most kernels that support multiple logical interfaces on a single physical interface, don't keep separate statistics for each of these. They simply report the overall statistics for the physical interface itself.
There's no easy way around this problem - the agent can only report such values as it can find out. If the kernel doesn't keep track of these figures, the agent can't report them.
Sorry!
