本次试验基于mininet平台，在平台中利用ovs新建1个交换机，以pox为控制器，ovx作为中间层实现虚拟化。
基础请参照http://ovx.onlab.us/getting-started/tutorial/
但是由于上述只是直线拓扑，而且中间不经过节点，因此我们要构建一个复杂的拓扑，如标红的拓扑
首先我们将pox的l2_learing修改一下，也就是把host，switch与path信息写进去
其次开启ovx，pox
在/ovx/utils/具体代码如下：
新建虚拟网络，并制定控制器与host的ip域
python ovxctl.py -n createNetwork tcp:192.168.100.107:6633 10.0.0.0 16
由switch的DPID新建虚拟交换机
python ovxctl.py -n createSwitch 1 00:00:00:00:00:00:02:00
python ovxctl.py -n createSwitch 1 00:00:00:00:00:00:05:00
python ovxctl.py -n createSwitch 1 00:00:00:00:00:00:08:00
为每一个虚拟交换机添加port，指定物理port，注意返回的虚拟port_id
python ovxctl.py -n createPort 1 00:00:00:00:00:00:02:00 5
python ovxctl.py -n createPort 1 00:00:00:00:00:00:02:00 6
python ovxctl.py -n createPort 1 00:00:00:00:00:00:05:00 5
python ovxctl.py -n createPort 1 00:00:00:00:00:00:05:00 6
python ovxctl.py -n createPort 1 00:00:00:00:00:00:08:00 5
python ovxctl.py -n createPort 1 00:00:00:00:00:00:08:00 7
连接switchs，这里10 10 是因为我们对协议进行改变了，支持ooe了
python ovxctl.py -n connectLink 1 00:a4:23:05:00:00:00:01 2 00:a4:23:05:00:00:00:02 1 10 10 spf 1
python ovxctl.py -n connectLink 1 00:a4:23:05:00:00:00:01 1 00:a4:23:05:00:00:00:03 1 10 10 spf 1
python ovxctl.py -n connectLink 1 00:a4:23:05:00:00:00:02 2 00:a4:23:05:00:00:00:03 2 10 10 spf 1
新建port，并通过该port与host相连
python ovxctl.py -n createPort 1 00:00:00:00:00:00:02:00 1
python ovxctl.py -n connectHost 1 00:a4:23:05:00:00:00:01 3 00:00:00:00:02:01
python ovxctl.py -n createPort 1 00:00:00:00:00:00:05:00 2
python ovxctl.py -n connectHost 1 00:a4:23:05:00:00:00:02 3 00:00:00:00:05:02
python ovxctl.py -n createPort 1 00:00:00:00:00:00:08:00 3
python ovxctl.py -n connectHost 1 00:a4:23:05:00:00:00:03 3 00:00:00:00:08:03
开启虚拟网络
python ovxctl.py -n startNetwork 1
我们可以在mininet dump_flows查看流表信息
*** ATL ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x100000000, duration=10.141s, table=0, n_packets=0, n_bytes=0, idle_timeout=10000,priority=42,ooe,in_port=5,dl_src=a4:23:05:01:00:00,dl_dst=a4:23:05:10:00:06,ooe_dst=0x2 actions=output:7
*** CLE ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
*** EWR ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
*** IAD ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x100000003, duration=9.167s, table=0, n_packets=0, n_bytes=0, idle_timeout=10000,priority=42,ooe,in_port=5,dl_src=a4:23:05:01:00:00,dl_dst=a4:23:05:10:00:06,ooe_dst=0x2,ooe_start=11,ooe_length=2 actions=mod_dl_src:00:00:00:00:02:01,mod_dl_dst:00:00:00:00:05:02,output:2
*** IAH ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x100000000, duration=10.177s, table=0, n_packets=0, n_bytes=0, idle_timeout=10000,priority=42,ooe,in_port=5,dl_src=a4:23:05:01:00:00,dl_dst=a4:23:05:10:00:06,ooe_dst=0x2 actions=output:7
*** LAX ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x100000000, duration=10.184s, table=0, n_packets=0, n_bytes=0, idle_timeout=10000,priority=42,ooe,in_port=5,dl_src=a4:23:05:01:00:00,dl_dst=a4:23:05:10:00:06,ooe_dst=0x2 actions=output:7
*** MCI ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
*** ORD ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
*** SEA ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
*** SFO ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x100000003, duration=10.232s, table=0, n_packets=0, n_bytes=0, idle_timeout=10000,priority=42,ooe,in_port=1,dl_src=00:00:00:00:02:01,dl_dst=00:00:00:00:05:02,ooe_dst=0x2 actions=mod_ooe_start:11,mod_ooe_length:2,mod_dl_src:a4:23:05:01:00:00,mod_dl_dst:a4:23:05:10:00:06,output:6
*** SLC ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):