[  519.389029] bond0: (slave eth0): making interface the new active one
[  519.389101] bond0: (slave eth0): Enslaving as an active interface with an up link
[  523.599755] bond0: (slave eth0): Releasing backup interface
[  523.685792] bond0: (slave eth0): Enslaving as an active interface with an up link
[  527.827836] bond0: (slave eth0): Releasing backup interface