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