Ryu和Mininet测试过程Bug记录

1 Ryu运行shortest_forwarding.py：

（1）更改/ryu/ryu/flags.py

（2）更改/ryu/ryu/topology/switches.py，

——在"class PortData(object)"的初始化中添加self.delay

 ——在"class Switch(object):"里添加函数

    @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
    def packet_in_handler(self, ev):
        # add code for getting LLDP packet receiving timestamp
        recv_timestamp = time.time()
        if not self.link_discovery:
            return

        msg = ev.msg
        try:
            src_dpid, src_port_no = LLDPPacket.lldp_parse(msg.data)
        except LLDPPacket.LLDPUnknownFormat as e:
            return

        dst_dpid = msg.datapath.id
        if msg.datapath.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
            dst_port_no = msg.in_port
        elif msg.datapath.ofproto.OFP_VERSION >= ofproto_v1_2.OFP_VERSION:
            dst_port_no = msg.match['in_port']
        else:
            LOG.error('cannot accept LLDP. unsupported version. %x',
                      msg.datapath.ofproto.OFP_VERSION)

        # get the lldp delay, and save it into port_data.
        for port in self.ports.keys():
            if src_dpid == port.dpid and src_port_no == port.port_no:
                send_timestamp = self.ports[port].timestamp
                if send_timestamp:
                    self.ports[port].delay = recv_timestamp - send_timestamp

（3）重新编译安装ryu：sudo python3 setup.py install

（4）启动ryu控制器：

——ryu-manager shortest_forwarding.py --observe-links --k-paths=2 --weight=bw

若报错"sock.bind(addr) OSError:[Errno 98] Address already in use"，如图：

2 Mininet运行拓扑文件

启动ryu后，另开一个窗口运行mininet：

清除已有拓扑——sudo mn -c

3 Mininet添加iperfmulti

（1）修改mininet/mininet/net.py，增加两个函数：

（2）修改mininet/mininet/cli.py，增加命令解析函数： 

（3）修改mininet/bin/mn：

（4）重新编译安装mininet：

——～/mininet/util/install.sh -n

或

——sudo apt-get remove mininet

——sudo apt-get install mininet

（5）在mininet中运行iperfmulti：