解決一個坑爹的mininet的pingall失敗的問題(自己編譯安裝openvswitch後)

我在Ubuntu16.04上裝好mininet和opendaylight後是可以正常運行的：

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 hosts
h1 h2 h3 h4 
*** Starting controller
c0 
*** Starting 3 switches
s1 s2 s3 ...
*** Starting CLI:
mininet> pingall
*** Ping: testing ping reachability
h1 -> 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 reachability
h1 -> h2 h3 h4 
h2 -> h1 h3 h4 
h3 -> h1 h2 h4 
h4 -> h1 h2 h3 
*** Results: 0% dropped (12/12 received)

但當我自己編譯安裝openvswitch後，遇到了問題:

參考資料:New to SDN - Mininet with HP VAN SDN 2.7 - Pings f… - Hewlett Packard Enterprise Community