mirror of
https://gitlab.com/netravnen/NetworkLabNotes.git
synced 2024-12-23 20:57:53 +00:00
52 lines
1.9 KiB
TeX
52 lines
1.9 KiB
TeX
\chapter{Layer 3}
|
|
|
|
\section{Routed Network}
|
|
|
|
\section{OSPF}
|
|
\section{IS-IS}
|
|
\section{EIGRP}
|
|
\section{RIP}
|
|
\section{Static}
|
|
\section{BGP}
|
|
|
|
\wikicommons{BGP_FSM}
|
|
|
|
The protocol of the internet used since 1994.\cite{wiki:Border_Gateway_Protocol}
|
|
Currently based upon \rfc{4271} with updates following in \rcf{6286} \rfc{6608}, \rfc{6793}, \rfc{7606}, \rfc{7607}, \rfc{7705}.
|
|
|
|
|
|
|
|
\begin{itemize}
|
|
\item \itemhead{Properties}
|
|
\begin{itemize}
|
|
\item Uses tcp/179 as \gls{dst} port
|
|
\item Sends keep-alive message every 1 minute
|
|
\item Keep-alive message is 19 byte
|
|
\end{itemize}
|
|
\item \itemhead{Route exchange}
|
|
\begin{itemize}
|
|
\item \itemhead{Route-maps mechanism}
|
|
\begin{itemize}
|
|
\item Routes can be aggregated between \Glspl{as}.
|
|
\item Properties can be changed on the fly by mathing
|
|
\begin{enumerate*}[label={\alph*)}]
|
|
\item \Gls{bgp} communities,
|
|
\item \Gls{ip} prefix,
|
|
\item \Gls{bgp} as-path,
|
|
\end{enumerate*}
|
|
\end{itemize}
|
|
\item
|
|
\end{itemize}
|
|
\item \itemhead{States}
|
|
\begin{enumerate}
|
|
\item Idle: \Gls{bgp} while initializing refuses all incoming connections. Will initiate \Gls{tcp} connection to peer.
|
|
\item Connect: Waits for \Gls{tcp} connection. If \Gls{tcp} is established goes to state OpenSent. If \Gls{tcp} is \textit{un}successful ConnectRetry timer is started and then goes to Active state.
|
|
\item Active: When ConnectRetry counter reaches 0 goes to state Connect.
|
|
\item OpenSent: Sends \gls{msg} to remote node. Waits for reply \gls{msg} before going to OpenConfirm.
|
|
\item OpenConfirm: Nodes exchange keepalive \glspl{msg} and goes to Established state if successful.
|
|
\item Established: Nodes can now exchange KeepAlive, Updates, and Notification \glspl{msg}.
|
|
\end{enumerate}
|
|
\end{itemize}
|
|
|
|
|