[  504.543612] bond0: (slave eth0): making interface the new active one
[  504.543706] bond0: (slave eth0): Enslaving as an active interface with an up link
[  508.758479] bond0: (slave eth0): Releasing backup interface
[  508.830207] bond0: (slave eth0): Enslaving as an active interface with an up link
[  512.987290] bond0: (slave eth0): Releasing backup interface