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