进行回归测试 mn --test
透过 --test可以对建立的拓朴进行测试
pingpair则可以测试主机之间连线是否正常（Ping between first two hosts, useful for testing）
root@parallels-vm:~# mn --test pingpair*** Creating network*** Adding controller*** Adding hosts:h1 h2 *** Adding switches:s1 *** Adding links:(h1, s1) (h2, s1) *** Configuring hostsh1 h2 *** Starting controllerc0 *** Starting 1 switchess1 ...*** Waiting for switches to connects1 h1 -> h2 h2 -> h1 *** Results: 0% dropped (2/2 received)*** Stopping 1 controllersc0 *** Stopping 2 links..*** Stopping 1 switchess1 *** Stopping 2 hostsh1 h2 *** Donecompleted in 5.681 secondsiperf(Simple iperf TCP test between two (optionally specified) ???hosts.Usage: iperf node1 node2)
root@parallels-vm:~# mn --test iperf*** Creating network*** Adding controller*** Adding hosts:h1 h2 *** Adding switches:s1 *** Adding links:(h1, s1) (h2, s1) *** Configuring hostsh1 h2 *** Starting controllerc0 *** Starting 1 switchess1 ...*** Waiting for switches to connects1 *** Iperf: testing TCP bandwidth between h1 and h2 .*** Results: [‘36.3 Gbits/sec‘, ‘36.3 Gbits/sec‘]*** Stopping 1 controllersc0 *** Stopping 2 links..*** Stopping 1 switchess1 *** Stopping 2 hostsh1 h2 *** Donecompleted in 10.987 seconds用参数调整拓朴--topo
--topo=TOPO ??????????linear|minimal|reversed|single|torus|tree[,param=value ???????????????????????...] linear=LinearTopo torus=TorusTopo tree=TreeTopo ???????????????????????single=SingleSwitchTopo ???????????????????????reversed=SingleSwitchReversedTopo minimal=MinimalToposingle
single 指的是单个，这类的拓朴只有一个交换机(Switch)，而主机个数可以任意指定，拓朴成星型
root@parallels-vm:~# mn --topo=single,3*** Creating network*** Adding controller*** Adding hosts:h1 h2 h3 *** Adding switches:s1 *** Adding links:(h1, s1) (h2, s1) (h3, s1) *** Configuring hostsh1 h2 h3 *** Starting controllerc0 *** Starting 1 switchess1 ...*** Starting CLI:mininet> neth1 h1-eth0:s1-eth1h2 h2-eth0:s1-eth2h3 h3-eth0:s1-eth3s1 lo: ?s1-eth1:h1-eth0 s1-eth2:h2-eth0 s1-eth3:h3-eth0c0linear
linear指的是直线， 一个交换机配一个主机，而主机和交换机的个数可以任意指定，拓朴形状成直线型
root@parallels-vm:~# mn --topo=linear,3*** Creating network*** Adding controller*** Adding hosts:h1 h2 h3 *** Adding switches:s1 s2 s3 *** Adding links:(h1, s1) (h2, s2) (h3, s3) (s2, s1) (s3, s2) *** Configuring hostsh1 h2 h3 *** Starting controllerc0 *** Starting 3 switchess1 s2 s3 ...*** Starting CLI:mininet> neth1 h1-eth0:s1-eth1h2 h2-eth0:s2-eth1h3 h3-eth0:s3-eth1s1 lo: ?s1-eth1:h1-eth0 s1-eth2:s2-eth2s2 lo: ?s2-eth1:h2-eth0 s2-eth2:s1-eth2 s2-eth3:s3-eth2s3 lo: ?s3-eth1:h3-eth0 s3-eth2:s2-eth3c0tree
tree指的是树，这类的拓朴形状成树状，交换机成树状分散开来，树的最下面一层挂两台主机
root@parallels-vm:~# mn --topo=tree,3*** Creating network*** Adding controller*** Adding hosts:h1 h2 h3 h4 h5 h6 h7 h8 *** Adding switches:s1 s2 s3 s4 s5 s6 s7 *** Adding links:(s1, s2) (s1, s5) (s2, s3) (s2, s4) (s3, h1) (s3, h2) (s4, h3) (s4, h4) (s5, s6) (s5, s7) (s6, h5) (s6, h6) (s7, h7) (s7, h8) *** Configuring hostsh1 h2 h3 h4 h5 h6 h7 h8 *** Starting controllerc0 *** Starting 7 switchess1 s2 s3 s4 s5 s6 s7 ...*** Starting CLI:mininet> neth1 h1-eth0:s3-eth1h2 h2-eth0:s3-eth2h3 h3-eth0:s4-eth1h4 h4-eth0:s4-eth2h5 h5-eth0:s6-eth1h6 h6-eth0:s6-eth2h7 h7-eth0:s7-eth1h8 h8-eth0:s7-eth2s1 lo: ?s1-eth1:s2-eth3 s1-eth2:s5-eth3s2 lo: ?s2-eth1:s3-eth3 s2-eth2:s4-eth3 s2-eth3:s1-eth1s3 lo: ?s3-eth1:h1-eth0 s3-eth2:h2-eth0 s3-eth3:s2-eth1s4 lo: ?s4-eth1:h3-eth0 s4-eth2:h4-eth0 s4-eth3:s2-eth2s5 lo: ?s5-eth1:s6-eth3 s5-eth2:s7-eth3 s5-eth3:s1-eth2s6 lo: ?s6-eth1:h5-eth0 s6-eth2:h6-eth0 s6-eth3:s5-eth1s7 lo: ?s7-eth1:h7-eth0 s7-eth2:h8-eth0 s7-eth3:s5-eth2c0minimal
minimal指的是最小，也是mininet默认的拓朴，为一个交换机连接两个主机
root@parallels-vm:~# mn --topo=minimal*** Creating network*** Adding controller*** Adding hosts:h1 h2 *** Adding switches:s1 *** Adding links:(h1, s1) (h2, s1) *** Configuring hostsh1 h2 *** Starting controllerc0 *** Starting 1 switchess1 ...*** Starting CLI:mininet> neth1 h1-eth0:s1-eth1h2 h2-eth0:s1-eth2s1 lo: ?s1-eth1:h1-eth0 s1-eth2:h2-eth0c0--mac
创建mininer时默认会给每一个设备（host,switch等..）分配一个MAC位址，但每一次分配的mac位置都会随之改变，调适难度较大。 --mac就是保证mac位置简单易懂。
尚未调适过的：
mininet> h1 ifconfig | grep HWaddrh1-eth0 ??Link encap:Ethernet ?HWaddr 8e:43:77:2e:47:c9 加入--mac
mininet> h1 ifconfig | grep HWaddrh1-eth0 ??Link encap:Ethernet ?HWaddr 00:00:00:00:00:01开启各别主机的 terminalxterm
mn -x会在开启mininet时，将各个设备的terminal打开 ???????
若要针对单一个设备打开xtrem，便在开启拓朴后，执行xterm (设备)
Mininet(轻量级软件定义网络和测试平台) 之二
原文地址：http://blog.51cto.com/12098022/2119725