diff --git a/chapter/baseconf.tex b/chapter/baseconf.tex
index b0c2a6e..368f79a 100644
--- a/chapter/baseconf.tex
+++ b/chapter/baseconf.tex
@@ -12,6 +12,7 @@
 \lstinputlisting[language=cisco]{code/base.cfg/lldp.cfg}
 \lstinputlisting[language=cisco]{code/base.cfg/ntp.cfg}
 \lstinputlisting[language=cisco]{code/base.cfg/ospf.cfg}
+\lstinputlisting[language=cisco]{code/base.cfg/spanningtree.cfg}
 \lstinputlisting[language=cisco]{code/base.cfg/snmp.cfg}
 \lstinputlisting[language=cisco]{code/base.cfg/ssh.cfg}
 \lstinputlisting[language=cisco]{code/base.cfg/vty.cfg}
diff --git a/code/base.cfg/spanningtree.cfg b/code/base.cfg/spanningtree.cfg
new file mode 100644
index 0000000..289624e
--- /dev/null
+++ b/code/base.cfg/spanningtree.cfg
@@ -0,0 +1,6 @@
+spanning-tree mode rapid-pvst
+spanning-tree loopguard default
+spanning-tree logging
+spanning-tree extend system-id
+!
+vlan internal allocation policy ascending