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@ -54,27 +54,40 @@ Always remember the following points for Cisco devices:\cite{wiki:Administrative
\section{EIGRP} \section{EIGRP}
\gls{eigrp} is Cisco's enhanced edition if \gls{igrp}. Dating back to 1993 and a leg for Cisco over other vendors back in the early days of the Internet. (.. hmm. And remember Cisco's implementation of \gls{ospf} was known to be unstable until the early 2000's.) \gls{eigrp} is Cisco's enhanced edition if \gls{igrp}. Dating back to 1993 and a
leg for Cisco over other vendors back in the early days of the Internet. (..
hmm. And remember Cisco's implementation of \gls{ospf} was known to be unstable
until the early 2000's.)
The change to \gls{eigrp} from \gls{igrp} was due to the support of classless routing. (\gls{igrp} only supported classful routing of class A (/8), B (/16), and C (/24) networks.) The change to \gls{eigrp} from \gls{igrp} was due to the support of classless
routing. (\gls{igrp} only supported classful routing of class A (/8), B (/16),
and C (/24) networks.)
Cisco converted \gls{eigrp} to an open standard back in 2013 with \rfc{7868}.\cite{wiki:Enhanced_Interior_Gateway_Routing_Protocol} Cisco converted \gls{eigrp} to an open standard back in 2013 with
\rfc{7868}.\cite{wiki:Enhanced_Interior_Gateway_Routing_Protocol}
\gls{eigrp} adds support for \gls{vlsm} and the \gls{dual} with improved routing capabilities in comparison to \gls{igrp}. Overall \gls{eigrp} provides better capabilities compared to it's predecessor. \gls{eigrp} adds support for \gls{vlsm} and the \gls{dual} with improved routing
capabilities in comparison to \gls{igrp}. Overall \gls{eigrp} provides better
capabilities compared to it's predecessor.
\subsection[Math]{The Math behind} \subsection[Math]{The Math behind}
\fig{math/eigrp-dual-long}{eigrp-dual-long}{\glspl{eigrp} \gls{dual} full formula} \fig{math/eigrp-dual-long}{eigrp-dual-long}{\glspl{eigrp} \gls{dual} full
formula}
By default $K_2$, and $K_4$ is set to zero. (The are user customizable!) And $K_5$ is set to 0. By default $K_2$, and $K_4$ is set to zero. (The are user customizable!) And
$K_5$ is set to 0.
In effect the resulting shorter formula is this: In effect the resulting shorter formula is this:
\fig{math/eigrp-dual-short}{eigrp-dual-short}{\glspl{eigrp} \gls{dual} short formula} \fig{math/eigrp-dual-short}{eigrp-dual-short}{\glspl{eigrp} \gls{dual} short
formula}
\subsection{How it actually works} \subsection{How it actually works}
\gls{eigrp} does it routing on a \texttt{next-hop} basis. Meaning it only stores information about a given routes next turn. And \textbf{not} about the destination itself. (Like \gls{ospf} does) \gls{eigrp} does it routing on a \texttt{next-hop} basis. Meaning it only stores
information about a given routes next turn. And \textbf{not} about the
destination itself. (Like \gls{ospf} does)
\subsubsection{Defaults} \subsubsection{Defaults}