使用RYU控制器将主机放入VLAN

Question

我已经使用以下命令将四个主机H1 H2 H3 H4连接到单个开关S1中的两个VLAN，其中有VLAN标签10和20，

第一个启动Mininet。

sudo mn - topo单，4 - controller远程-MAC -I 10.0.0.1/24

然后使用OVS命令

首先将S1删除作为快捷方式来删除端口 sudo ovs-vsctl del-br s1

然后添加开关S1并添加带有标签的同一端口，

sudo ovs-vsctl add-br s1
sudo ovs-vsctl add-port s1 s1-eth1 tag=10
sudo ovs-vsctl add-port s1 s1-eth2 tag=20
sudo ovs-vsctl add-port s1 s1-eth3 tag=10
sudo ovs-vsctl add-port s1 s1-eth4 tag=20

现在H1和H3将在同一VLAN上； H2和H4将在同一v局域网上。

现在我的问题是如何使用不使用OVS命令而是使用编程的RYU控制器进行相同的操作。

Answer 1

我并不完全使用VLAN，而是一个列表。
这里是。

在simple_switch_13.py中，

将此行添加为全局变量

port_to_vlan = {1：10，2：20，3：10，4：20}

in Handler中的数据包在操作后添加此操作= [Parser。 ofPactionOutput（out_port）]：

    if out_port != ofproto.OFPP_FLOOD:
        if port_to_vlan[in_port] != port_to_vlan[out_port]:
            actions = []

最终代码是：

from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.lib.packet.ether_types import ETH_TYPE_8021Q
from ryu.ofproto import ofproto_v1_3
from ryu.lib.packet import packet, vlan
from ryu.lib.packet import ethernet
from ryu.lib.packet import ether_types

port_to_vlan = {1: 10, 2: 20, 3: 10, 4: 20}


class SimpleSwitch13(app_manager.RyuApp):
    OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]

    def __init__(self, *args, **kwargs):
        super(SimpleSwitch13, self).__init__(*args, **kwargs)
        self.mac_to_port = {}

    @set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
    def switch_features_handler(self, ev):
        datapath = ev.msg.datapath
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser

        # install table-miss flow entry
        #
        # We specify NO BUFFER to max_len of the output action due to
        # OVS bug. At this moment, if we specify a lesser number, e.g.,
        # 128, OVS will send Packet-In with invalid buffer_id and
        # truncated packet data. In that case, we cannot output packets
        # correctly.  The bug has been fixed in OVS v2.1.0.
        match = parser.OFPMatch()
        actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
                                          ofproto.OFPCML_NO_BUFFER)]
        self.add_flow(datapath, 0, match, actions)

    def add_flow(self, datapath, priority, match, actions, buffer_id=None):
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser

        inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
                                             actions)]
        if buffer_id:
            mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
                                    priority=priority, match=match,
                                    instructions=inst)
        else:
            mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
                                    match=match, instructions=inst)
        datapath.send_msg(mod)

    @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
    def _packet_in_handler(self, ev):
        # If you hit this you might want to increase
        # the "miss_send_length" of your switch
        if ev.msg.msg_len < ev.msg.total_len:
            self.logger.debug("packet truncated: only %s of %s bytes",
                              ev.msg.msg_len, ev.msg.total_len)
        msg = ev.msg
        datapath = msg.datapath
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser
        in_port = msg.match['in_port']

        pkt = packet.Packet(msg.data)
        eth = pkt.get_protocols(ethernet.ethernet)[0]

        if eth.ethertype == ether_types.ETH_TYPE_LLDP:
            # ignore lldp packet
            return
        dst = eth.dst
        src = eth.src

        dpid = format(datapath.id, "d").zfill(16)
        self.mac_to_port.setdefault(dpid, {})

        self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)

        # learn a mac address to avoid FLOOD next time.
        self.mac_to_port[dpid][src] = in_port

        if dst in self.mac_to_port[dpid]:
            out_port = self.mac_to_port[dpid][dst]
        else:
            out_port = ofproto.OFPP_FLOOD

        actions = [parser.OFPActionOutput(out_port)]
        if out_port != ofproto.OFPP_FLOOD:
            if port_to_vlan[in_port] != port_to_vlan[out_port]:
                actions = []



        # install a flow to avoid packet_in next time
        if out_port != ofproto.OFPP_FLOOD:
            match = parser.OFPMatch(in_port=in_port, eth_dst=dst, eth_src=src)
            # verify if we have a valid buffer_id, if yes avoid to send both
            # flow_mod & packet_out
            if msg.buffer_id != ofproto.OFP_NO_BUFFER:
                self.add_flow(datapath, 1, match, actions, msg.buffer_id)
                return
            else:
                self.add_flow(datapath, 1, match, actions)
        data = None
        if msg.buffer_id == ofproto.OFP_NO_BUFFER:
            data = msg.data

        out = parser.OFPPacketOut(datapath=datapath, buffer_id=msg.buffer_id,
                                  in_port=in_port, actions=actions, data=data)
        datapath.send_msg(out)

输出为：