Preferably, the link weights are adjusted to reduce the imbalance in {TAIL ~ link utilizations} without deteriorating the cost of {HEAD ~ network operation} 
Preferably , the link weights are adjusted to reduce the imbalance in { TAIL ~ link utilizations } without deteriorating the cost of { HEAD ~ network operation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD