sdn第六次作业

1.实验拓扑

• 实验拓扑
  
• 要求
  使用Python脚本完成拓扑搭建，并连接ryu控制器。

class MyTopo(Topo):

    def __init__(self):

        # initilaize topology
        Topo.__init__(self)

        # add hosts and switches
        h1 = self.addHost('h1')
        h2 = self.addHost('h2')
        h3 = self.addHost('h3')
        h4 = self.addHost('h4')
        h5 = self.addHost('h5')
        h6 = self.addHost('h6')
        s1 = self.addSwitch('s1')
        s2 = self.addSwitch('s2')

        # add links
        self.addLink(h1, s1, 1, 1)
        self.addLink(h2, s1, 1, 2)
        self.addLink(h3, s1, 1, 3)
        self.addLink(s1, s2, 4, 4)
        self.addLink(h4, s2, 1, 1)
        self.addLink(h5, s2, 1, 2)
        self.addLink(h6, s2, 1, 3)
        
topos = {'mytopo': (lambda: MyTopo())}

• 创建拓扑
  
• 测试连通性
  
• 运行文件下的gui_topology
  

2.使用Ryu的REST API下发流表实现和第2次实验同样的VLAN

要求：编写脚本，一键执行下发流表。

• 下发流表(以s1为例)

配置交换机s1-----------------------------------------------

#端口1发来的数据
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "in_port":1
    },
    "actions":[
        {
            "type": "PUSH_VLAN",    # s1将从端口1发来的数据包打上vlan_tag
            "ethertype": 33024      # 帧类型0x8100(=33024): 表示IEEE 802.1Q的VLAN数据帧
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",    # 设置VLAN ID
            "value": 4096       # 设置vlan_id的值,VLAN_ID = 0 (0x1000)
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add

#端口号2发来数据
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "in_port":2
    },
    "actions":[
        {
            "type": "PUSH_VLAN",    # s1将从端口2发来的数据包打上vlan_tag
            "ethertype": 33024
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",
            "value": 4097       # 设置vlan_id的值,VLAN_ID = 1 (0x1001)
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add
#端口号3发来数据
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "in_port":3
    },
    "actions":[
        {
            "type": "PUSH_VLAN",    # s1将从端口3发来的数据包打上vlan_tag
            "ethertype": 33024
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",
            "value": 4098       # 设置vlan_id的值,VLAN_ID = 2 (0x1002)
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add
#对收到的包进行分流
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "dl_vlan": "0"
    },
    "actions":[
        {
            "type": "POP_VLAN",     # 将 dl_vlan=0 的包出去 vlan_tag
        },
        {
            "type": "OUTPUT",
            "port": 1           # 向端口1转发
        }
    ]
}' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "dl_vlan": "1"
    },
    "actions":[
        {
            "type": "POP_VLAN",     # 将 dl_vlan=1 的包出去 vlan_tag
        },
        {
            "type": "OUTPUT",
            "port": 2           # 向端口2转发
        }
    ]
}' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "dl_vlan": "2"
    },
    "actions":[
        {
            "type": "POP_VLAN",     # 将 dl_vlan=2 的包出去 vlan_tag
        },
        {
            "type": "OUTPUT",
            "port": 3           # 向端口3转发
        }
    ]
}' http://localhost:8080/stats/flowentry/add

• 流表已被接受
  
• 验证连通性
  

3.对比两种方法，写出你的实验体会

ryu的方法更加直观，便于理解。