How to change the bonding mode without rebooting the system...

Find current bonding mode:

#cd /sys/class/net/bond0/bonding

#cat mode

 balance-rr   0   

          

The current bonding mode is round-robin.

Change the bonding mode:

#ifdown bond0

#echo 1 >mode

#cat mode

active-backup 1

Now the bonding mode has been changed to active-backup.

Up the bond0 again:

#ifup bond0

Check if the bonding mode has been changed:

#cat /proc/net/bonding/bond0