Bond Configuration change not reflected.

I have changed bond configuration(mode) from TLB to ALB in modprobe.conf file.
But after the restart of machine the change is not reflected in the system.While doing a >>cat /sys/class/net/bond0/bonding/mode , it shows TLB mode, where as in modprobe.conf file alb exists.Can somebody help me out to troubleshoot the same?

11.2.4. Channel Bonding Interfaces