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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.


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PC upload graph:
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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.

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Re: [Help] Bandwidth I/O graphs wrong with LACP aggregated NICs

Posted: 17 Jan 2026, 21:56
by TMzethar
Okay, noted.