We're seeing a strange issue with the SNMP data from our FortiGate 1500D firewall.
We're running version 6.4.4 and using SNMP V3.
Basically it seems that the Octet data isn't being captured on our 10Gbps WAN link when under load.
We have a 1Gbps WAN link and that graph is consistent and accurate. We also have some 100Gb switch links being monitored by our SNMP data gathering server, and those are all true as well - so I don't think it has anything to do with the link speed or throughput.
When we load up the 10G link you can see the graph information is missing from our SNMP data gathering server, but not from the dashboard in the web interface of the FortiGate.
Please see attached example photos.
Disregard the Units on the 10Gbps link, just a formatting error from the graphing system.
Here is the 1Gbps WAN link with no issues of missing or incorrect data.
Here is the 10Gbps link that while under load is missing information and incorrect data rates.
2.5KMb/s just means 2500Mb/s and you can see this doesn't tally with the actual throughput.
Here is the 10Gbps link that while under load is fine from the web interface.