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* HSLS hello packet, flood message  packet format

* HSLS multicast or unicast floods or both?

* HSLS API for route metrics

* ETX API for route metrics

* HSLS RIB API

* On the Quagga side, use is-is as a model for making the requisite
  changes to Quagga.

* HSLS data structures: nodes, links per node pair, metrics per
  link; borrow from OSPF RFC? connect interfaces w/ virtual LSUs?

* ETX data structures: data to compute metric, beacon counts (Tx/Rx)

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