Layer 3: Add initial section for ISIS

chapter/layer3.tex

@@ -55,6 +55,24 @@ Always remember the following points for Cisco devices:\cite{wiki:Administrative
 
 \section{IS-IS}
 
+\gls{isis} is the ISO standardized routing protocol. Designed for use by intermediate systems.
+
+\gls{isis} compared to other routing protocols standardized in the \gls{ietf}.
+\begin{itemize}
+    \item Everything is \gls{tlv} based. Making the protocol very extensible by standardizing new \gls{tlv} values.
+    \item The participating nodes communicates with its neighbors on \gls{l2}. Thereby not \textit{requiring} \gls{l3} addresses on the link. And instead uses the \gls{mac} to target the neighbor node.
+    \item The connection is done on per-interface. Similar to \gls{ospf3}. Instead of the global approach in \gls{ospf2}.
+    \begin{itemize}
+        \item The per-interface is the result of deciding the area is handled per-interface. Instead of at the per-node level.
+        \item The border between areas is at the node level. Instead of the interface level in \gls{ospf2}.
+    \end{itemize}
+    \item Uses its own ethertype of 0x22F4\cite{IEEE802N51:online}.
+    \begin{itemize}
+        \item \rfc{6325}.
+    \end{itemize}
+    \item Commun
+\end{itemize}
+
 \newpage
 
 \section{EIGRP}

references-websites.bib

@@ -58,3 +58,12 @@
     year = {},
     note = {(Accessed on 02/18/2018)}
 }
+
+@misc{IEEE802N51:online,
+    author = {},
+    title = {IEEE 802 Numbers - https://www.iana.org/},
+    howpublished = {\url{https://www.iana.org/assignments/ieee-802-numbers/ieee-802-numbers.xhtml#ieee-802-numbers-1}},
+    month = {},
+    year = {},
+    note = {(Accessed on 10/01/2024)}
+}