ovs-vsctl add-br host1 ovs-vsctl add-port host1 internet -- set Interface internet type=internal ifconfig internet 192.168.64.1 ovs-vsctl set-controller tcp:CONTROLLER_IP:6633 ovs-vsctl add-br host2 ovs-vsctl add-port host2 internet -- set Interface internet type=internal ifconfig internet 192.168.64.2 ovs-vsctl set-controller tcp:CONTROLLER_IP:6633
./pox.py l3_switch --fakeways=192.168.64.2 info.packet_dump log.level --DEBUG
1. Keep a table that maps IP address to switch dpid, port, mac. Stock this table using information from ARP and IP packets. 2. When you see an ARP query, try to answer it using information in the table from step 1. If the info in the table is old, just flood the query. 3. Flood all other ARPs. 4. When you see an IP packet, if you know the destination port (because it's in the table from step 1), forward packet to switch and port with matched dest ip.
POX is a networking software platform written in Python
POX started life as an OpenFlow controller, but can now also function
as an OpenFlow switch, and can be useful for writing networking software
POX officially requires Python 2.7 (though much of it will work fine
fine with Python 2.6), and should run under Linux, Mac OS, and Windows.
(And just about anywhere else -- we've run it on Android phones,
under FreeBSD, Haiku, and elsewhere. All you need is Python!)
You can place a pypy distribution alongside pox.py (in a directory
named "pypy"), and POX will run with pypy (this can be a significant
POX currently communicates with OpenFlow 1.0 switches and includes
special support for the Open vSwitch/Nicira extensions.
pox.py boots up POX. It takes a list of module names on the command line,
locates the modules, calls their launch() function (if it exists), and
then transitions to the "up" state.
Modules are looked for everywhere that Python normally looks, plus the
"pox" and "ext" directories. Thus, you can do the following:
You can pass options to the modules by specifying options after the module
name. These are passed to the module's launch() funcion. For example,
to set the address or port of the controller, invoke as follows:
./pox.py openflow.of_01 --address=10.1.1.1 --port=6634
pox.py also supports a few command line options of its own which should
be given first:
--verbose print stack traces for initialization exceptions
--no-openflow don't start the openflow module automatically