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Sudden dops & spikes on interface graphs

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  • t4h3r0
    Junior Member
    • Jul 2026
    • 7

    #1

    Sudden dops & spikes on interface graphs

    Hi everyone,
    New to the forum and relatively new to Zabbix.

    I recently finished deploying a distributed Zabbix HA cluster with proxies.
    Monitoring Cisco NCS-5500 & NCS-540X series devices using "Cisco IOS by SNMP", ZTE ZXCTN 6120H series devices with a cloned version of "Cisco IOS by SNMP" named "ZTE ROSNG by SNMP" and Huawei ATN 910 series devices with "Huawei VRP by SNMP" templates. Minimal minor changes have been made to tamplates.

    On the Cisco and ZTE devices, interface traffic graphs are exhibiting a recurring sudden drops & spikes cycles or rubber-banding pattern sharp drops followed by immediate spikes every 30 to 40 minutes. The actual physical traffic is perfectly smooth.
    This is only happening on the Cisco and less dramatically on ZTE hosts. The Huawei devices are rendering perfectly smooth, accurate graphs under the exact same network conditions. Increasing the polling interval from 1m to 2m reduced the amplitude of the spikes but did not solve the root issue.

    I would genuinely appreciate any insights, configuration tweaks or pointers you might have. Thanks in advance.

    Click image for larger version  Name:	Cisco.jpg Views:	0 Size:	268.8 KB ID:	514879
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    Last edited by t4h3r0; Today, 13:40.
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