When IPFIX is enabled on multiple VMs on a KVM host and the sampling rate is 100%, the management IPs on some of the VMs might intermittently be unreachable.

Problem

When you enable IPFIX for multiple VMs on the same host and you set the sampling rate to be 100%, there can be a large amount of IPFIX traffic. This can impact management traffic, causing the management IPs to be intermittently unreachable, even if the production traffic and management traffic go through different OVSes.

Cause

The workload is too stressful for the host and the VMs.

Solution

  1. Reduce the load on the host by reducing the number of VMs with IPFIX enabled or reducing the sampling rate.