Reinstated multitest example and updated examples/README.

examples/README

 
 Mininet Examples
 
----
-
 These examples are intended to help you get started using
-Mininet's Python API:
+Mininet's Python API.
+
+---
 
 linearbandwidth.py:
 
 This example shows how to create a custom topology programatically
 by subclassing Topo, and how to run a series of tests on it.
 
+multitest.py:
+
+This example creates a network and runs multiple tests on it.
+
 scratchnet.py, scratchnetuser.py:
 
 These two examples demonstrate how to create a network by using the lowest-
 level Mininet functions. Generally the higher-level API is easier to use,
 but scratchnet shows what is going on behind the scenes.
 
+sshd.py:
+
+This example shows how to run an sshd process in each host, allowing
+you to log in via ssh. This requires connecting the Mininet data network
+to an interface in the root namespace (generaly the control network
+already lives in the root namespace, so it does not need to be explicitly
+connected.)
+
 udpbwtest.py:
 
 This example shows how to run a test across an entire network, and monitor

examples/multitest.py

+#!/usr/bin/python
+
+"""
+This example shows how to create a network and run multiple tests.
+For a more complicated test example, see udpbwtest.py.
+"""
+
+from mininet.cli import CLI
+from mininet.log import lg, info
+from mininet.net import init, Mininet
+from mininet.node import KernelSwitch
+from mininet.topolib import TreeTopo
+
+def ifconfigTest( net ):
+    "Run ifconfig on all hosts in net."
+    hosts = net.hosts
+    for host in hosts:
+        info( host.cmd( 'ifconfig' ) )
+
+if __name__ == '__main__':
+    lg.setLogLevel( 'info' )
+    info( "*** Initializing Mininet and kernel modules\n" )
+    KernelSwitch.setup()
+    init()
+    info( "*** Creating network\n" )
+    network = Mininet( TreeTopo( depth=2, fanout=2 ), switch=KernelSwitch)
+    info( "*** Starting network\n" )
+    network.start()
+    info( "*** Running ping test\n" )
+    network.pingAll()
+    info( "*** Running ifconfig test\n" )
+    ifconfigTest( network )
+    info( "*** Starting CLI (type 'exit' to exit)\n" )
+    CLI( network )
+    info( "*** Stopping network\n" )
+    network.stop()