Preferably, the link weights are adjusted to reduce the cost of network operation without increasing the imbalance in link utilizations while keeping {HEAD ~ the utilization} for each link below {TAIL ~ a specific threshold} 
Preferably , the link weights are adjusted to reduce the cost of network operation without increasing the imbalance in link utilizations while keeping { HEAD ~ the utilization } for each link below { TAIL ~ a specific threshold }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL