strange "comb" lines on Cisco Switch port reports | NetApp | Page 1

runic loom Feb 18, 2026, 9:19 AM

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While browsing through the reports of the Metro IP switches I've noticed a strange line pattern. Does this has to do with polling intervals not in sync with the refresh rate of the switch statistics?

open bison Feb 18, 2026, 10:02 AM

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@runic loom Default polling interval of the Cisco switch monitoring in Harvest would be 3m, Could say share more detail about the issue.

What is refresh rate of your switch ?
Which version of Harvest and ontap version you are monitoring ?
Is this the recent behaviour or you have observed in past also?

runic loom Feb 18, 2026, 10:16 AM

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The switch is a Cisco NX9336C. I don't now technical details about the statistics presented.
Harvest: 25.11.0, Ontap: 9.16.1P9
The lines look like this since the beginning, I just noticed because of a case.

open bison Feb 18, 2026, 12:21 PM

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@runic loom Thanks for the response.
For this above panel, we are invoking the show interface api to cisco switch via NX-API and then fetched eth_inbytes field and then exposed the same metric ascisco_interface_receive_bytes . As this metric type is rate, so applied the same in Grafana to visualize in graph.

Could you share the logs at Harvest email address ng-harvest-files@netapp.com, we can go through it and evaluate any skips exist in Harvest polling for your switch

runic loom Feb 18, 2026, 12:32 PM

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Sure, what logs do you mean? I have limited knowledge of Harvest and Nabox..

open bison Feb 18, 2026, 12:36 PM

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You can follow this doc https://nabox.org/documentation/troubleshooting/#collecting-support-bundle for NABox support bundle generation and then you can upload them here: https://upload.nabox.org/tygi-qete-hory

runic loom Feb 18, 2026, 1:01 PM

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Thank you! nabox-logs-2026-02-18_125922.tgz has been uploaded.

sinful island Feb 18, 2026, 3:53 PM

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FWIW, I see a similar "jagged" or comb-like pattern in the Traffic panel graphs, it is only apparent (or more apparent) when I zoom e.g. down to 12 Hours.

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(Here we try to only look at / filter for the MetroCluster ISL links of the switches)

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FYI: I wouldn't say that the same issue is apparent in other panels e.g. the graphs in Transceiver (signal stength) don't seem to show the same effect

open bison Feb 19, 2026, 12:28 PM

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Thanks for the log files.
I have checked your logs and there are no specific errors in CiscoRest collector for interface template or any skips observed. as per the logs, 52 instances are exported successfully from plugin.

runic loom Feb 19, 2026, 2:03 PM

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Thanks for the analysis!
Has somebody another explanation for the strange line shape then?

odd inlet Feb 19, 2026, 4:34 PM

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hi @runic loom we have validated the numbers that Harvest publishes match the Cisco CLI. Can you check the CLI and compare? Here's the comparison we did - in my case, I picked a single interface port-channel1 but the same comparision worked for all interfaces

show interface port-channel1 counters brief

-------------------------------------------------------------------------------
Interface         Input Rate (avg)    Output Rate (avg)
                  ------------------  ------------------
                  Rate     Total      Rate     Total        Rate averaging
                  MB/s     Frames     MB/s     Frames       interval (seconds)
-------------------------------------------------------------------------------
Po1               416      632005     1005     632886       30
                  415      629758     1003     630607       300

the 415 MB/s matches the Grafana panel "Interface Receive Throughput"
the 1003 MB/s matches the Grafana panel "Interface Send Throughput"

runic loom Feb 24, 2026, 8:51 AM

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Hi @odd inlet - thank you. I've just checked this and it makes still no sense to me.

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I also see no up/down of the values in the CLI compared to the Grafana lines.

#strange "comb" lines on Cisco Switch port reports