Now we need to edit the existing configuration files for the two NIC that will conform the combined interface.
Content of /etc/sysconfig/network-scripts/ifcfg-eth0 file
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=none
MASTER=bond0
SLAVE=yes
Content of /etc/sysconfig/network-scripts/ifcfg-eth1 file
DEVICE=eth1
ONBOOT=yes
BOOTPROTO=none
MASTER=bond0
SLAVE=yes