If your Interfaces are 200Mb or higher, it is recommended to enable and allow 64 bit counters.
1Gb Interfaces at max utilization will achieve counter wrap at 3 minutes. The default NPM polling for Interfaces is every 9 minutes to determine the delta of the previous counter to the current counter. This counter wrap will report the interface utilization incorrectly by showing very high above 100% or very low when this occurs.
If the Interface is showing the utilization incorrectly, I always recommend to check to make sure that the bandwidth is correct (sometimes the device has a bug which reports the interface incorrectly) and whether the Interface has 64 bit counters enabled. Some older devices will not support 64 bit counters, but those usually do not have 1gb. If the device has 32 bit counters only and it has a 1Gb Interface, then you would have to increase the polling rate to before the counter overlaps.
Here are the OIDs for both 32 and 64 for reference.
OID = ifInOctets 126.96.36.199.188.8.131.52.1.10.
OID = ifInUcastPkts 184.108.40.206.220.127.116.11.1.11.
OID = ifInNUcastPkts 18.104.22.168.22.214.171.124.1.12.
OID = ifOutOctets 126.96.36.199.188.8.131.52.1.16.
OID = ifOutUcastPkts 184.108.40.206.220.127.116.11.1.17.
OID = ifOutNUcastPkts 18.104.22.168.22.214.171.124.1.18.
OID = ifHCInOctets 126.96.36.199.188.8.131.52.1.1.6.
OID = ifHCInUcastPkts 184.108.40.206.220.127.116.11.1.1.7.
OID = ifHCInMulticastPkts 18.104.22.168.22.214.171.124.1.1.8.
OID = ifHCOutOctets 126.96.36.199.188.8.131.52.1.1.10.
OID = ifHCOutUcastPkts 184.108.40.206.220.127.116.11.1.1.11.
OID = ifHCOutMulticastPkts 18.104.22.168.22.214.171.124.1.1.12.