name prefix.
\paragraph*{7: Trigger Rates} Check the trigger rates, compare the current readings with the usual ones seen during
- the shift.
\ No newline at end of file
+ the shift.
+
+\subsection{10 Gbit Ethernet Switch Died}
+It happened several times that the main 10 Gbe switch died. This means that all Eventbuilder are not reachable any more
+neither from the internal network nor from the main GSI network.
+
+The following actions should only be done by an expert or with support from an expert by phone!
+
+\begin{itemize}
+ \item Check that the switch is the real cause of the problem.
+ \item Unplug all 10 connections (copper wires). Keep them in order, they have to be plugged back to the same plug!
+ \item Unplug optical up-link
+ \item Wait 10 seconds
+ \item Re-plug all 10 connections
+ \item Re-plug up-link
+\end{itemize}
+