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[Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 15 Jan 2026, 16:00
by renob
F4-425 Plus
TOS 6.0.794-01324
UniFi USW Pro XG 8 PoE switch with link aggregation on two consecutive ports
Network bandwidth graphs on the Overview and Resource Monitor pages are doubling actual bandwidth usage when using LACP aggregation.
Both NICs on the NAS are linked to my switch at 5 gbps each but the PC that is uploading files to the NAS only has a 2.5 gbps port.
Graphs report 600 MB/s network throughput which is impossible.
You only see correct information on the Resource Monitor page if you manually select the single NIC which is transferring data.
PC upload graph:
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 15 Jan 2026, 19:14
by TMzethar
We have recorded the exception you mentioned. We will attempt to reproduce and fix the issue.
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 17 Jan 2026, 13:04
by renob
Here is one last example with an upload from a 5gbe PC showing 1000 MB/s throughput.
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 17 Jan 2026, 21:56
by TMzethar
Okay, noted.
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 20 Jul 2026, 20:01
by renob
The doubled bandwidth display with an LACP bond is not present in TOS 7.
Screenshots from a 2.5 gbe PC uploading to the NAS.
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 21 Jul 2026, 17:19
by TMzethar
Your request has been duly noted and has been added to our requirements tracking list. We appreciate your valuable feedback. Should there be any further developments, we will provide updates in this thread.
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 22 Jul 2026, 18:59
by TMzethar
The same anomaly has been confirmed. It appears to be a display-related issue and has been entered into our tracking system for resolution. We appreciate your feedback. A fix will be included in a future update.
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 23 Jul 2026, 10:06
by TMzethar
We suspect your Bond wasn't set up properly. Could you go to Control Panel > Network > Interfaces, expand each interface to show its details, and send us a screenshot?
After that, try removing the Bond and recreating it — that might help for now.
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 27 Jul 2026, 14:10
by HeliaWu
renob wrote: ↑20 Jul 2026, 20:01
Before creating an LACP-type bond, did you bind the corresponding ports on your switch?
Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs
Posted: 04 Aug 2026, 18:26
by renob
I reported on 7/20 that the bug was NOT happening on TOS 7. It was happening on TOS 6.
The only thing that changed was the TOS version so this appears to simply be a bug in TOS 6 as far as my testing is concerned.
The switch configuration is not at fault. Link aggregation (LACP) was configured on two consecutive ports as is required by my switch before the NAS was configured for the bond.
I don't plan on changing anything since upgrading to TOS 7 has fixed the bug.