From Bugzilla Helper:
User-Agent: Opera/7.50 (X11; Linux i686; U)  [en]

Description of problem:
This bug is present in RHEL 2.1 and 3.0, RH9, FC1 and FC2.

When using network device bonding, the ifup script sets the link status of the slave 
interfaces to be down. Line 200:
if [ "${SLAVE}" = yes -a "${ISALIAS}" = no -a "${MASTER}" != "" -a \
     -x /sbin/ifenslave ]; then
    RFLAG="" ; [ "${RECEIVEONLY}" = yes ] && RFLAG="-r"

    /sbin/ip link set dev ${DEVICE} down
    echo $"Enslaving ${DEVICE} to ${MASTER}"
    ifenslave ${RFLAG} "${MASTER}" "${DEVICE}"

Changing to:
    /sbin/ip link set dev ${DEVICE} up
makes everything work.

I'm attaching my configs for bond0 and a slave.

Version-Release number of selected component (if applicable):
initscripts-7.53-1

How reproducible:
Always

Steps to Reproduce:
1. 'ifup bond0' 

Actual Results:  slave interfaces are brought down

Expected Results:  slave interfaces brought up. :)

Additional info: