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