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@ -213,7 +213,9 @@ area 0.0.0.1
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router 201.0.113.2
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\end{lstlisting}
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The tree as output by BIRD has three levels, we call them top-level, level-2
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The tree as output by BIRD\footnote{The format was determined by
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experimentation and inspecting of \texttt{proto/ospf/ospf.c} in BIRD's source
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code\cite{bird-src}.} has three levels, we call them top-level, level-2
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and level-3. The top level only contains directives of form \texttt{area
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AreaID}, with the AreaID being written in the quad-dotted notation.
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