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EIGRP Updates Exchanges added

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netravnen 2017-10-21 16:14:07 +02:00
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chapter/layer3.tex
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@ -109,7 +109,21 @@ If a router is configured as a \texttt{Stud Router}. It only carries information
\section{Updates Exchange}
<!-- Some text -->
\begin{enumerate}
\item Routers always exchange full topology table information when neighbor-ship is established.
\item Now refresh of data will be done. Unless topology updates occur.
\item If the topology changes. A partial update about the specific prefix is sent to neighbors.\footnote{Changes includes metric components, link statuses, change in announced topology information.}
\item If a neighbor-ship fail. Then a new adjacency is formed with a full topology exchange is done.
\end{enumerate}
Always remember \gls{eigrp} does split-horizon by default on all active links when exchanging topology updates.
Split-horizon is the \textit{famous} rule about not sending topology updates back to the router who sent the topology update in the first place.
\gls{eigrp} uses \gls{rtp} to send topology updates and confirmation receipts.
On \gls{p2p} interfaces. \gls{eigrp} simply send and ACK back to the sender.
On multi-access interface/segments. \gls{eigrp} sends updates to 224.0.0.10 and receivers reply with a unicast ACK message to the sender.
\subsection[SIA]{Stuck-in-Active}
\gls{eigrp} is known and feared for it being \texttt{Stuck-in-Active} mode when exchanging route updates between routers. The Stuck-in-Active state could cause problems on low end network gear with a low amount of resources available for the routing process. Which in cases could cause the network device to use all available resources when querying neighbor devices for updates.