"""

Node Library for Mininet

This contains additional Node types which you may find to be useful

"""

from mininet.net import Mininet

from mininet.topo import Topo

from mininet.node import Switch

from mininet.log import setLogLevel, info

class LinuxBridge( Switch ):

"Linux Bridge (with optional spanning tree)"

nextPrio = 100 # next bridge priority for spanning tree

def __init__( self, name, stp=False, prio=None, **kwargs ):

"""stp: use spanning tree protocol? (default False)

prio: optional explicit bridge priority for STP"""

self.stp = stp

if prio:

self.prio = prio

else:

self.prio = LinuxBridge.nextPrio

LinuxBridge.nextPrio += 1

Switch.__init__( self, name, **kwargs )

def connected( self ):

"Are we forwarding yet?"

if self.stp:

return 'forwarding' in self.cmd( 'brctl showstp', self )

else:

return True

def start( self, controllers ):

self.cmd( 'ifconfig', self, 'down' )

self.cmd( 'brctl delbr', self )

self.cmd( 'brctl addbr', self )

if self.stp:

self.cmd( 'brctl setbridgeprio', self.prio )

self.cmd( 'brctl stp', self, 'on' )

for i in self.intfList():

if self.name in i.name:

self.cmd( 'brctl addif', self, i )

self.cmd( 'ifconfig', self, 'up' )

def stop( self ):

self.cmd( 'ifconfig', self, 'down' )

self.cmd( 'brctl delbr', self )