diff --git a/chapter/section/spanningtree.tex b/chapter/section/spanningtree.tex
index 24c0fde..87e0c26 100644
--- a/chapter/section/spanningtree.tex
+++ b/chapter/section/spanningtree.tex
@@ -377,6 +377,8 @@ It is the network admins job to propagate an even configuration to all switches
 
 \fig{spanningtree/mstregions2}{mstregions2}{MST Regions vlans mapped to different instances.}
 
+\pagebreak % avoids column break for the following text
+
 \begin{txt}
 |<-------- bridge id ----------->|
 
@@ -390,3 +392,13 @@ It is the network admins job to propagate an even configuration to all switches
     MST inst. no. carried in
       Ext. Syst. ID Area
 \end{txt}
+
+\subsection{Common Troubleshooting}
+
+\begin{itemize}
+    \item Wrong duplex settings: Mismatch half/full duplex.
+    \item Failure on uni-directional links
+    \item Frame corruption
+    \item Resource errors
+    \item Wrong/Error with PortFast configuration
+\end{itemize}
\ No newline at end of file