I'm inspecting a problem with a MongoDB replica set reelecting a primary multiple times per minute. It seems that there is something wrong with the network configuration, but I can't nail it down yet.
ifconfig on the virtual machine of one of the nodes, I see a high number of TX collisions on
RX packets 850479 bytes 253445128 (241.7 MiB) RX errors 0 dropped 12070 overruns 0 frame 0 TX packets 512851 bytes 210486965 (200.7 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 2648104
I don't understand what it means.
When I search what exactly are TX collisions, all I find is that those are related to the actual, physical network cables. However, the hardware server hosting this virtual machine reports zero collisions.
So what exactly is a TX collision in a context of a virtual machine (a Debian 9 running on QEMU/KVM, hosted on Ubuntu 18, if it matters)?