The steps of the method include adding new links to {HEAD ~ 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 {TAIL ~ an imbalance} in link utilizations 
The steps of the method include adding new links to { HEAD ~ 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 { TAIL ~ an imbalance } in link utilizations
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH