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