Erroneous traffic spikes during communication problems with device


I am having trouble with the following: When the host running librenms tries to poll a device which has connectivity problems (not completely out of network but, say, dropping packets), then the graphs are destroyed by super high traffic spikes, which are not true (e.g. 80Gbps spike reported on 1G interface).

Here’s an example spike on a 2Gbps interface:


Output for version etc:



Component Version
LibreNMS 1.44
DB Schema 268
PHP 7.0.32-0ubuntu0.16.04.1
MySQL 10.0.36-MariaDB-0ubuntu0.16.04.1
RRDTool 1.5.5

[OK] Composer Version: 1.7.2
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct

Is anyone else seeing something like that?

Try enabling RRDTune on that interface

1 Like

Thanks! It seems that although I googled my problem, I failed to find the relevant documentation.

Why are you googling use the docs at

Well… docs site search is very poor + is not indexed by google :frowning:

Basically I did not look at the docs because I could not imagine that such a strange thing would be documented. If docs though were google indexed, I would have found the relevant section.