I am using Real time polling on a router (Cisco) or Firewall (Juniper SRX) interface and i see peak receive rates are showing 300MB with spikes to 750 MB.
Im sure these interfaces don't push that much traffic.Is there a bug with Real time polling?
No bug. But you may seen occastion data weirdness as these are just counters. When they overflow (return to zero), there might be a slight abnormal reading. But that should not happen often as they are 64 bit counters.