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