diff --git a/mininet/topolib.py b/mininet/topolib.py
new file mode 100644
index 0000000..63ba36d
--- /dev/null
+++ b/mininet/topolib.py
@@ -0,0 +1,36 @@
+"Library of potentially useful topologies for Mininet"
+
+from mininet.topo import Topo
+from mininet.net import Mininet
+
+class TreeTopo( Topo ):
+    "Topology for a tree network with a given depth and fanout."
+
+    def __init__( self, depth=1, fanout=2 ):
+        super( TreeTopo, self ).__init__()
+        # Numbering:  h1..N, s1..M
+        self.hostNum = 1
+        self.switchNum = 1
+        # Build topology
+        self.addTree( depth, fanout )
+
+    def addTree( self, depth, fanout ):
+        """Add a subtree starting with node n.
+           returns: last node added"""
+        isSwitch = depth > 0
+        if isSwitch:
+            node = self.addSwitch( 's%s' % self.switchNum )
+            self.switchNum += 1
+            for _ in range( fanout ):
+                child = self.addTree( depth - 1, fanout )
+                self.addLink( node, child )
+        else:
+            node = self.addHost( 'h%s' % self.hostNum )
+            self.hostNum += 1
+        return node
+
+
+def TreeNet( depth=1, fanout=2, **kwargs ):
+    "Convenience function for creating tree networks."
+    topo = TreeTopo( depth, fanout )
+    return Mininet( topo, **kwargs )