LTM: Interface Failsafe

Dears, Can some one assist me to understand what the script below exactly did: shift shift interfaces="$*" interfaces="1/2.2 2/2.2" b interface show > /tmp/b_interface_show for i in $interfaces ; do status=`grep "^ *$i " /tmp/b_interface_show | awk '{print $2}'` logger -p local0.notice "interface $i is parced and status is $status" if [ "$status" = "DN" ] ; then logger -p local0.notice "$MON_TMPL_NAME: interface $i is DOWN (status: $status)" for f in $interfaces ; do logger -p local0.notice "$MON_TMPL_NAME: bring down other interfaces" if [ $f != $i ] ; then b interface $f disable fi done echo "failed" > /tmp/int_fail_state exit 1 fi if [ "$status" = "UP" ] ; then state=`cat /tmp/int_fail_state` if [ "$state" = "failed" ] ; then logger -p local0.notice "$MON_TMPL_NAME: interface $i is back UP (status: $status)" for f in $interfaces ; do logger -p local0.notice "$MON_TMPL_NAME: bring UP interface $f in group ($interfaces)" b interface $f enable done echo "ok" > /tmp/int_fail_state fi fi done All specified interfaces are up... echo "up" exit 0 I have Active F5a and Standby F5b and need to do fail safe interface between them. Once I apply it on F5a (active) and interfaces 1/2.1 and 2/2.2 still up; F5a changed to standby and another F5 didn't go active. I have other monitor for interface fail safe for interfaces 1/2.1 1/2.3 2/2.1. Please I need to understand this script very clearly to know the reason that made F5a goes to standby. Thanks.