bonding driver broken on centos6?

I have a server with minimal installation of CentOS6 64bit (minimal option from the installer). The bonding driver does not seem to work correctly. The output from /proc/net/bonding/bond0 is:

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: None
MII Status: down
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

The as you can see there are no interfaces listed as salves. The bond driver options were configured in /etc/modprobe.d/bonding.conf as:

alias bond0 bonding
options bond0 mode=1 primary=eth0 miimon=100

Interfaces eth0 and eth4 are configured as such:

DEVICE="eth0"
MASTER="bond0"
SLAVE="yes"
HWADDR="78:2B:CB:56:ED:5D"
NM_CONTROLLED="no"
ONBOOT="yes"

DEVICE="eth4"
MASTER="bond0"
SLAVE="yes"
HWADDR="00:1B:21:C9:F7:38"
NM_CONTROLLED="no"
ONBOOT="yes"

and bond0 is configured as such:

DEVICE="bond0"
IPADDR="10.100.46.3"
NETMASK="255.255.254.0"
NM_CONTROLLED="no"
ONBOOT="yes"

And here is output from /var/log/messages:

Dec  9 08:20:55 app2 kernel: bonding: Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.
Dec  9 08:20:55 app2 kernel: ADDRCONF(NETDEV_UP): bond0: link is not ready
Dec  9 08:21:02 app2 kernel: ADDRCONF(NETDEV_UP): bond0: link is not ready

Can anyone offer some insight as to why the driver is failing to start? Is this a dependencies issue?

Your log said:

miimon or arp_interval and arp_ip_target module parameters must be specified

Try to add lines below (you can choose your favourite options) to your ifcfg-bond0:

BONDING_OPTS='miimon=1000 mode=6'

Updating the OS with just sudo yum update fixed the issue. Not sure which part did it unfortunately.