[  521.145548] bond0: (slave eth0): making interface the new active one
[  521.145615] bond0: (slave eth0): Enslaving as an active interface with an up link
[  525.322589] bond0: (slave eth0): Releasing backup interface
[  525.383645] bond0: (slave eth0): Enslaving as an active interface with an up link
[  529.549291] bond0: (slave eth0): Releasing backup interface