[  505.513959] bond0: (slave eth0): making interface the new active one
[  505.514059] bond0: (slave eth0): Enslaving as an active interface with an up link
[  509.716917] bond0: (slave eth0): Releasing backup interface
[  509.805836] bond0: (slave eth0): Enslaving as an active interface with an up link
[  514.012133] bond0: (slave eth0): Releasing backup interface