snmp interface bandwidth throughput

rv@kaufmann.dk · August 2022

Hi,

I monitor the external interface bandwidth throughput with snmp. I noticed each time the traffic goes past 400-500Mbit/s, my snmp agent (zabbix) do not get reply packets (i guess) as the graph is missing data.

Original i was monitoring a M370 cluster and thought i might be a HW/cpu performance issue, but now this cluster is replaced by a FireboxV, and i see the exact same result with this firebox.

The box has allocated 2 x vCPU Intel(R) Xeon(R) Gold 6234 CPU @ 3.30GHz and 4GB memory with a 10Gbit/s uplink. CPU usage is under 5% on each core.

Why do the firebox drops snmp packets when traffic reach the above interface speed?

Regards
Robert

james.carson · August 2022

Hi @rv@kaufmann.dk
That sounds like buggy behavior -- there could be any number of reasons causing this to happen.

I would suggest opening a support case so that we can get some more details from your firewall. If possible, if you can please also include info about your Zabbix server like version.

My best guess would be that the SNMP traffic is getting dropped as the interface starts to saturate, but I believe both of these firewalls should have enough CPU time that this shouldn't be an issue.