When I start a new VM, my host network stops functioning, and then I
have persistent issues with the host network thereafter, even after
shutting down all VMs.
The symptom of my network issues is that it intermittently goes down.
ping returns "Destination Host Unreachable" even for hosts on my local
network, although my routes still look good according to 'route -rn'. I
believe my network is flooded with STP packets at this point and all my
switches will go down shortly thereafter. I can recover for a while by
unplugging/replugging network cable but the problem comes back after a
few minutes. A reboot will clear it up.
On the host dmesg output, I see the following when this occurs:
I am using the alx driver (AR816x/AR817x network controller) with Fedora 19.
I have attached output of 'brctl show', 'ip link', and 'ip
use NetworkManager, and disable WiFi manually before using libvirt.
I would very much appreciate any guidance.