在mininet中增加新功能主要分为3步：

1. 修改net.py增加函数实体；

2. 修改cli.py，增加对应do_function函数，用于命令解析；

3. 修改mn函数，用于声明命令。

net.py和cli.py文件均在mininet/mininet目录，mn文件在在mininet/bin目录下.

修改cli.py

def do_iperfmulti( self, line ):   		args=line.split()		if len(args) == 1:			udpBw = args[ 0 ]			self.mn.iperfMulti(udpBw)		elif len(args)== 2:			udpBw = args[ 0 ]			period = args[ 1 ]			err = False			self.mn.iperfMulti(udpBw,int(period))		else:			error('invalid number of args: iperfmulti udpBw \n' +'udpBw examples: 1M\n')

 修改net.py

def iperfMulti( self, load, period=5):		""Multi iperf UDP test between nodes"""		base_port = 5001		#output(load)		server_list = []		client_list = [h for h in self.hosts]		host_list = []		host_list = [h for h in self.hosts]				cli_outs = []		ser_outs = []					_len = len(host_list)		#output(_len)		for i in xrange(0, _len):			client = host_list[i]			server = client						while( server == client ):				server = random.choice(host_list)			server_list.append(server)						self.iperf_single(hosts = [client, server], udpBw=load, period=period, port=base_port)			sleep(.05)			base_port += 1				sleep(period)

 

def iperf_single( self,hosts=None, udpBw=5, period=5, port=5001):        """"""        if not hosts:            return        else:            assert len( hosts ) == 2        client, server = hosts        filename = client.name+'.out'        filenameserver = server.name+'.out'        delayname = client.name+'-'+server.name+'.delay'        output( '***testing bandwidth between ' )        output( "%s and %s\n" % ( client.name, server.name ) )        iperfArgs = 'iperf -u'            print "****start server******"        server.cmd( iperfArgs + '-s' + ' >> /home/zhao/log/' + 'server-'+filenameserver + '&')        print "****start client******"        client.cmd(iperfArgs + '-t ' + str(period) + ' -c ' + server.IP() + ' -b '+str(udpBw)+'M'+ ' >> /home/zhao/log/'+ 'client-' + filename +'&')

 

 

修改mn

TESTS = [ 'cli', 'build', 'pingall', 'pingpair', 'iperf', 'all', 'iperfudp', 'none', 'iperfmulti' ]ALTSPELLING = { 'pingall': 'pingAll',                'pingpair': 'pingPair',                'iperfudp': 'iperfUdp',                'iperfUDP': 'iperfUdp',		'iperfmulti': 'iperfmulti' }

 输入以下命令重新编译安装mininet core

  sudo ./mininet/util/install.sh -n

重启mininet，输入iperf，可使用table补全iperfmulti，从而可使用iperfmulti进行测试