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