The steps of the method include adding new links to the network topology model to protect against single node failures, and adjusting link weights for the network topology model to reduce at least one of a cost of network operation and {HEAD ~ an imbalance} in {TAIL ~ link utilizations} 
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The steps of the method include adding new links to the network topology model to protect against single node failures , and adjusting link weights for the network topology model to reduce at least one of a cost of network operation and { HEAD ~ an imbalance } in { TAIL ~ link utilizations }
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 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