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我在Ubuntu16.04上装好mininet和opendaylight后是可以正常运行的：

root@mininet-vm [07:45:54 PM] [/etc/apt] -> # mn --controller=remote,ip=192.168.179.129,port=6633 --topo=tree,2*** Creating network*** Adding controller*** Adding hosts:h1 h2 h3 h4 *** Adding switches:s1 s2 s3 *** Adding links:(s1, s2) (s1, s3) (s2, h1) (s2, h2) (s3, h3) (s3, h4) *** Configuring hostsh1 h2 h3 h4 *** Starting controllerc0 *** Starting 3 switchess1 s2 s3 ...*** Starting CLI:mininet> pingall*** Ping: testing ping reachabilityh1 -> X h3 h4 h2 -> h1 h3 h4 h3 -> h1 h2 h4 h4 -> h1 h2 h3 *** Results: 8% dropped (11/12 received)mininet> pingall*** Ping: testing ping reachabilityh1 -> h2 h3 h4 h2 -> h1 h3 h4 h3 -> h1 h2 h4 h4 -> h1 h2 h3 *** Results: 0% dropped (12/12 received)

但当我自己编译安装openvswitch后，遇到了问题:

mininet> pingall*** Ping: testing ping reachabilityh1 -> X X Xh2 -> X X Xh3 -> X X Xh4 -> X X X*** Results: 100% dropped (0/12 received)

我始终找不到问题出在哪里，在网上查阅了 很多资料后，在下面看到了一个让我眼前一亮的回答：

root@mininet-vm [07:45:54 PM] [/etc/apt] -> # mn --controller=remote,ip=192.168.179.129,port=6633 --topo=tree,2 --switch ovs,protocols=OpenFlow10*** Creating network*** Adding controller*** Adding hosts:h1 h2 h3 h4 *** Adding switches:s1 s2 s3 *** Adding links:(s1, s2) (s1, s3) (s2, h1) (s2, h2) (s3, h3) (s3, h4) *** Configuring hostsh1 h2 h3 h4 *** Starting controllerc0 *** Starting 3 switchess1 s2 s3 ...*** Starting CLI:mininet> pingall*** Ping: testing ping reachabilityh1 -> X h3 h4 h2 -> h1 h3 h4 h3 -> h1 h2 h4 h4 -> h1 h2 h3 *** Results: 8% dropped (11/12 received)

果真，指定了参数后就能用了，吐血啊

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