Due to the fact that /etc/modprobe.conf has been deprecated in RHEL 6, the process of bonding network interfaces has changed a bit.

Now instead of defining your bond in your /etc/modprobe.conf, you define it in /etc/modprobe.d/bonding.conf. No changes in syntax.

alias bond0 bonding

Then in your ifconfig-bond0 file, you define your bonding mode. Note the quotes, and the fact that I explicitly typed out the bonding mode.

BONDING_OPTS=”miimon=100 mode=active-backup”