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@ -229,17 +229,28 @@ The third level describes details of the respective router/network and all the
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incident objects. There is always the distance from us (i.e. the router we
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asked for the dump), or the word \texttt{unreachable} if it is not reachable.
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There is also a level-3 line for each incident host and network. For routers and
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networks, this line is the same as on level-2, but routers may also be incident
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to extra-area networks (\texttt{xnetwork}), external networks
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(\texttt{external}), stub networks (\texttt{stubnet}) and extra-area routers
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(\texttt{xrouter}). In the backbone area, routers may also have virtual links
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to other routers (\texttt{vlink}). These networks are referenced by their IP
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address in both
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versions of OSPF, routers again by router IDs.
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These incidencies of routers have also a metric, after the word
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\texttt{metric}, or, in case of Type 2 external cost, \texttt{metric2}.
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There is also a level-3 line for each incident host and network. Overview of
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the \uv{tags} (the first words) and parameters is provided by
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table~\ref{tab:ospf-incidences}. Note that networks can only be incident to
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routers, while routers may be incident to anything. The incidences of routers
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have also a metric, after the word \texttt{metric}, or, in case of Type 2
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external cost, \texttt{metric2}.
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\begin{table}[h]
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\centering
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\begin{tabular}{lcc}\hline
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Incidence type & tag & parameter \\\hline
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Transit network & \texttt{network} & Same as on level-2 \\
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Router & \texttt{router} & Router ID \\
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Extra-area router & \texttt{xrouter} & Router ID \\
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Extra-area network & \texttt{xnetwork} & IP address (CIDR) \\
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External network & \texttt{external} & IP address (CIDR) \\
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Stub network & \texttt{stubnet} & IP address (CIDR) \\
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Virtual link & \texttt{vlink} & Peer router ID \\\hline
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\end{tabular}
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\caption{Level-3 lines describing incidences}
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\label{tab:ospf-incidences}
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\end{table}
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For networks, additional details are also provided on level-3. For OSPFv2, the
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designated router ID is given in the \texttt{dr} directive, similarly, OSPFv3
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