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Extra note about root port

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chhan11 2017-06-06 13:09:41 +02:00
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chapter/layer2.tex
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@ -425,7 +425,7 @@ Cisco did on their part early on enhance the original spanning tree standard wit
\item Root Guard
\begin{itemize}
\item \st{Prevents external switches from becoming roots}
\item If enabled, prevents any ports from becoming a root-port. Ports will remain as designated ports \textit{effectivily} preventing the switch becoming the root bridge.
\item If enabled, prevents any ports from becoming a root-port. Ports will remain as designated ports \textit{effectivily} preventing the switch becoming the root bridge.\footnote{You will enable Root Guard on all downstream trunk ports starting from the distribution layer. This prevents the next layer of switches downstream of becoming the root bridge.}
\item This, too, behaves in s similiar manner as \gls{bpdu} guard, putting the port in \texttt{err-disable} mode when a \gls{bpdu} packet is recieved on the port.
\item Enabled per-port with\\\cliline{cisco-switch(config-if)# spanning-tree guard root}
\end{itemize}