From 926c6e862a4f7d07fd202fbe7d52089c68c553e8 Mon Sep 17 00:00:00 2001
From: Pavel 'LEdoian' Turinsky <ledoian@matfyz.cz>
Date: Tue, 18 Jul 2023 00:16:06 +0200
Subject: [PATCH] Table is bettr

---
 en/chap02.tex | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/en/chap02.tex b/en/chap02.tex
index 9166255..f41e0ef 100644
--- a/en/chap02.tex
+++ b/en/chap02.tex
@@ -229,17 +229,28 @@ The third level describes details of the respective router/network and all the
 incident objects. There is always the distance from us (i.e. the router we
 asked for the dump), or the word \texttt{unreachable} if it is not reachable.
 
-There is also a level-3 line for each incident host and network. For routers and
-networks, this line is the same as on level-2, but routers may also be incident
-to extra-area networks (\texttt{xnetwork}), external networks
-(\texttt{external}), stub networks (\texttt{stubnet}) and extra-area routers
-(\texttt{xrouter}). In the backbone area, routers may also have virtual links
-to other routers (\texttt{vlink}). These networks are referenced by their IP
-address in both
-versions of OSPF, routers again by router IDs.
-
-These incidencies of routers have also a metric, after the word
-\texttt{metric}, or, in case of Type 2 external cost, \texttt{metric2}.
+There is also a level-3 line for each incident host and network. Overview of
+the \uv{tags} (the first words) and parameters is provided by
+table~\ref{tab:ospf-incidences}. Note that networks can only be incident to
+routers, while routers may be incident to anything. The incidences of routers
+have also a metric, after the word \texttt{metric}, or, in case of Type 2
+external cost, \texttt{metric2}.
+
+\begin{table}[h]
+	\centering
+	\begin{tabular}{lcc}\hline
+		Incidence type     & tag               & parameter \\\hline
+		Transit network    & \texttt{network}  & Same as on level-2 \\
+		Router             & \texttt{router}   & Router ID \\
+		Extra-area router  & \texttt{xrouter}  & Router ID \\
+		Extra-area network & \texttt{xnetwork} & IP address (CIDR) \\
+		External network   & \texttt{external} & IP address (CIDR) \\
+		Stub network       & \texttt{stubnet}  & IP address (CIDR) \\
+		Virtual link       & \texttt{vlink}    & Peer router ID \\\hline
+	\end{tabular}
+	\caption{Level-3 lines describing incidences}
+	\label{tab:ospf-incidences}
+\end{table}
 
 For networks, additional details are also provided on level-3. For OSPFv2, the
 designated router ID is given in the \texttt{dr} directive, similarly, OSPFv3