Brandon Heller
bf208cdeb6
A number of functions in node.py look like this: return self.intf( intf ).<other stuff> Previously, self.intf(...) in Node would expect a string name for an interface and return None if an object was passed in instead of a string name. Now, be more permissive and assume that objects passed in are for Intf objects. This makes all such functions in node.py handle more flexible input args, either name or actual Intf object. An alternative and equally valid approach would be to raise an Exception whenever a non-string, non-falsy value was passed in to Node.intf(), and to modify the code in at least one place - examples/sshd.py - to pass the interface name, rather than the interface object. Also fix input args for examples/scratchnetuser.py - the interface name was being passed in as the prefix len, which makes no sense.
74 lines
2.4 KiB
Python
Executable File
74 lines
2.4 KiB
Python
Executable File
#!/usr/bin/python
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"""
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Build a simple network from scratch, using mininet primitives.
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This is more complicated than using the higher-level classes,
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but it exposes the configuration details and allows customization.
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For most tasks, the higher-level API will be preferable.
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This version uses the user datapath and an explicit control network.
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"""
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from mininet.net import Mininet
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from mininet.node import Node
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from mininet.link import Link
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from mininet.log import setLogLevel, info
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def linkIntfs( node1, node2 ):
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"Create link from node1 to node2 and return intfs"
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link = Link( node1, node2 )
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return link.intf1, link.intf2
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def scratchNetUser( cname='controller', cargs='ptcp:' ):
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"Create network from scratch using user switch."
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# It's not strictly necessary for the controller and switches
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# to be in separate namespaces. For performance, they probably
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# should be in the root namespace. However, it's interesting to
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# see how they could work even if they are in separate namespaces.
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info( '*** Creating Network\n' )
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controller = Node( 'c0' )
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switch = Node( 's0')
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h0 = Node( 'h0' )
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h1 = Node( 'h1' )
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cintf, sintf = linkIntfs( controller, switch )
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h0intf, sintf1 = linkIntfs( h0, switch )
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h1intf, sintf2 = linkIntfs( h1, switch )
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info( '*** Configuring control network\n' )
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controller.setIP( '10.0.123.1/24', intf=cintf )
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switch.setIP( '10.0.123.2/24', intf=sintf)
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info( '*** Configuring hosts\n' )
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h0.setIP( '192.168.123.1/24', intf=h0intf )
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h1.setIP( '192.168.123.2/24', intf=h1intf )
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info( '*** Network state:\n' )
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for node in controller, switch, h0, h1:
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info( str( node ) + '\n' )
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info( '*** Starting controller and user datapath\n' )
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controller.cmd( cname + ' ' + cargs + '&' )
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switch.cmd( 'ifconfig lo 127.0.0.1' )
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intfs = [ str( i ) for i in sintf1, sintf2 ]
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switch.cmd( 'ofdatapath -i ' + ','.join( intfs ) + ' ptcp: &' )
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switch.cmd( 'ofprotocol tcp:' + controller.IP() + ' tcp:localhost &' )
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info( '*** Running test\n' )
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h0.cmdPrint( 'ping -c1 ' + h1.IP() )
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info( '*** Stopping network\n' )
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controller.cmd( 'kill %' + cname )
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switch.cmd( 'kill %ofdatapath' )
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switch.cmd( 'kill %ofprotocol' )
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switch.deleteIntfs()
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info( '\n' )
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if __name__ == '__main__':
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setLogLevel( 'info' )
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info( '*** Scratch network demo (user datapath)\n' )
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Mininet.init()
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scratchNetUser()
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