[  515.599411] bond0: (slave eth0): making interface the new active one
[  515.599533] bond0: (slave eth0): Enslaving as an active interface with an up link
[  519.758798] bond0: (slave eth0): Releasing backup interface
[  519.836096] bond0: (slave eth0): Enslaving as an active interface with an up link
[  523.992415] bond0: (slave eth0): Releasing backup interface