Removed unused param in add_link.

mininet/topo.py

@@ -63,7 +63,7 @@ class Topo(object):
         return result
 
     def add_link(self, node1, node2, port1=None, port2=None,
-                 *default, **opts):
+                 **opts):
         """node1, node2: nodes to link together
            port1, port2: ports (optional)
            opts: link options (optional)
@@ -181,7 +181,7 @@ class SingleSwitchTopo(Topo):
             self.add_link(host, switch)
 
 
-class SingleSwitchReversedTopo(SingleSwitchTopo):
+class SingleSwitchReversedTopo(Topo):
     '''Single switch connected to k hosts, with reversed ports.
 
     The lowest-numbered host is connected to the highest-numbered port.
@@ -194,7 +194,7 @@ class SingleSwitchReversedTopo(SingleSwitchTopo):
         @param k number of hosts
         @param enable_all enables all nodes and switches?
         '''
-        super(SingleSwitchTopo, self).__init__(**opts)
+        super(SingleSwitchReversedTopo, self).__init__(**opts)
         self.k = k
         switch = self.add_switch('s1')
         for h in irange(1, k):