[  515.426490] bond0: (slave eth0): making interface the new active one
[  515.426571] bond0: (slave eth0): Enslaving as an active interface with an up link
[  519.624294] bond0: (slave eth0): Releasing backup interface
[  519.686885] bond0: (slave eth0): Enslaving as an active interface with an up link
[  523.853348] bond0: (slave eth0): Releasing backup interface