Sudden dops & spikes on interface graphs

[t4h3r0]

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.

[Rudlafik]

Look at the CPU and RAM consumption of the measured active network elements. The CPU values should not exceed 60% and RAM 80% of the consumed power in the long term. Then the active element cannot keep up with the traffic.

[t4h3r0]

Look at the CPU and RAM consumption of the measured active network elements. The CPU values should not exceed 60% and RAM 80% of the consumed power in the long term. Then the active element cannot keep up with the traffic.

CPU load is under 5% and RAM Uasage is around 30% to 40%

These Cisco devices have considarably more powerful resources than the ZTE or Huawei devices

[irontmp]

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. The issue is as unrelated to Download Subway Surfers Mod APK as it is to any other non-networking topic, which is why I've ruled out external factors. 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.

I'd start by checking for missed SNMP polls or interface counter issues. That kind of rubber banding often happens when a poll is delayed or a counter isn't read correctly. Since Huawei devices are fine under the same setup, I'd compare the SNMP settings and interface items between the Cisco and Huawei templates to see what's different.