Restored treeping64 and tre1024 examples and updated README.

examples/tree1024.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+"""
+Create a 1024-host network, and run the CLI on it.
+If this fails because of kernel limits, you may have
+to adjust them, e.g. by adding entries to /etc/sysctl.conf
+and running sysctl -p. Check util/sysctl_addon.
+"""
+
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.net import init, Mininet
+from mininet.node import KernelSwitch
+from mininet.topolib import TreeTopo
+
+def TreeNet( depth=1, fanout=2, **kwargs ):
+    "Convenience function for creating tree networks."
+    topo = TreeTopo( depth, fanout )
+    return Mininet( topo, **kwargs )
+    
+if __name__ == '__main__':
+    setLogLevel( 'info' )
+    init()
+    KernelSwitch.setup()
+    network = TreeNet( depth=2, fanout=32, switch=KernelSwitch )
+    network.run( CLI, network )