Revision 281f6e59 mininet/net.py
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#!/usr/bin/python |
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"""Mininet: A simple networking testbed for OpenFlow! |
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author: Bob Lantz ( rlantz@cs.stanford.edu ) |
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author: Brandon Heller ( brandonh@stanford.edu ) |
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""" |
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Mininet: A simple networking testbed for OpenFlow! |
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author: Bob Lantz (rlantz@cs.stanford.edu) |
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author: Brandon Heller (brandonh@stanford.edu) |
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Mininet creates scalable OpenFlow test networks by using |
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process-based virtualization and network namespaces. |
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top of a single Linux kernel. |
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Each host has: |
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A virtual console ( pipes to a shell )
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A virtual interfaces ( half of a veth pair )
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A parent shell ( and possibly some child processes ) in a namespace
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A virtual console (pipes to a shell)
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A virtual interfaces (half of a veth pair)
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A parent shell (and possibly some child processes) in a namespace
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Hosts have a network interface which is configured via ifconfig/ip |
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link/etc. |
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In kernel datapath mode, the controller and switches are simply |
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processes in the root namespace. |
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Kernel OpenFlow datapaths are instantiated using dpctl( 8 ), and are
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Kernel OpenFlow datapaths are instantiated using dpctl(8), and are
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attached to the one side of a veth pair; the other side resides in the |
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host namespace. In this mode, switch processes can simply connect to the |
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controller via the loopback interface. |
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In user datapath mode, the controller and switches are full-service |
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nodes that live in their own network namespaces and have management |
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interfaces and IP addresses on a control network ( e.g. 10.0.123.1,
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currently routed although it could be bridged. )
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interfaces and IP addresses on a control network (e.g. 10.0.123.1, |
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currently routed although it could be bridged.) |
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In addition to a management interface, user mode switches also have |
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several switch interfaces, halves of veth pairs whose other halves |
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reside in the host nodes that the switches are connected to. |
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Naming: |
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Host nodes are named h1-hN |
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Switch nodes are named s0-sN |
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Interfaces are named { nodename }-eth0 .. { nodename }-ethN,"""
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Host nodes are named h1-hN |
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Switch nodes are named s0-sN |
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Interfaces are named { nodename }-eth0 .. { nodename }-ethN
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""" |
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import os |
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import re |
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import signal |
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autoSetMacs=False, autoStaticArp=False ): |
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"""Create Mininet object. |
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topo: Topo object |
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switch: Switch class
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switch: Switch class |
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host: Host class |
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controller: Controller class |
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cparams: ControllerParams object |
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lg.info( '\n' ) |
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lg.info( '*** Testing control network\n' ) |
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while not controller.intfIsUp( controller.intfs[ 0 ] ): |
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lg.info( '*** Waiting for %s to come up\n', controller.intfs[ 0 ] ) |
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lg.info( '*** Waiting for %s to come up\n', |
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controller.intfs[ 0 ] ) |
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sleep( 1 ) |
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for switchDpid in self.topo.switches(): |
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switch = self.nodes[ switchDpid ] |
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# Commands |
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def help( self, args ): |
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"Semi-useful help for CLI." |
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helpStr = ( 'Available commands are:' + str( self.cmds ) + '\n' +
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'You may also send a command to a node using:\n' +
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' <node> command {args}\n' +
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'For example:\n' +
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' mininet> h0 ifconfig\n' +
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'\n' +
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'The interpreter automatically substitutes IP ' +
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'addresses\n' +
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'for node names, so commands like\n' +
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' mininet> h0 ping -c1 h1\n' +
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'should work.\n' +
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'\n\n' +
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'Interactive commands are not really supported yet,\n' +
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'so please limit commands to ones that do not\n' +
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'require user interaction and will terminate\n' +
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helpStr = ( 'Available commands are:' + str( self.cmds ) + '\n' |
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'You may also send a command to a node using:\n' |
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' <node> command {args}\n'
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'For example:\n' |
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' mininet> h0 ifconfig\n' |
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'\n' |
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'The interpreter automatically substitutes IP ' |
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'addresses\n' |
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'for node names, so commands like\n' |
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' mininet> h0 ping -c1 h1\n' |
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'should work.\n' |
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'\n\n' |
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'Interactive commands are not really supported yet,\n' |
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'so please limit commands to ones that do not\n' |
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'require user interaction and will terminate\n' |
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'after a reasonable amount of time.\n' ) |
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print( helpStr ) |
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