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Chapter 2 spanning tree BPDU filter updated

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chhan11 2017-05-26 03:09:13 +02:00
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chapter/section/spanningtree.tex
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@ -227,11 +227,16 @@ Cisco did on their part early on enhance the original spanning tree standard wit
\item Affects all active portfast enabled ports, which \underline{don't} have a BPDU port configuration. \item Affects all active portfast enabled ports, which \underline{don't} have a BPDU port configuration.
\item If BPDU recieved on port, portfast and BPDU filter is disabled. \item If BPDU recieved on port, portfast and BPDU filter is disabled.
\item Sends \textbf{10} BPDUs on startup. If BPDU recieved in this timeframe \textit{same consequence as above} happens to the port. \item Sends \textbf{10} BPDUs on startup. If BPDU recieved in this timeframe \textit{same consequence as above} happens to the port.
\item \cliline{switch(config-if)# spanning-tree bpdufilter enable}
\end{enumerate} \end{enumerate}
\item B) per-port: \item B) per-port:
\begin{enumerate} \begin{enumerate}
\item \item Port ignores all recieved BPDUs.
\item Port sends no BPDUs.
\item \cliline{switch(config-if)# spanning-tree bpdufilter enable}
\end{enumerate} \end{enumerate}
\item Beware to \underline{only} enable BPDU filter on ports connected to end hosts. Consequence if not followed \underline{can} result in creating bridging loops.
\item Beware to \underline{only enable either} BPDU guard \textbf{\textit{or}} filter. \footnote{Cisco recommendation}
\end{itemize} \end{itemize}
\item Root Guard \item Root Guard
\begin{itemize} \begin{itemize}