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Mininet自定义topo

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本文字数： 2.7k 阅读时长 ≈ 2 分钟

mininet自带topo

通过mn -h可以看到Mininet自带的几种topo类型，分别有Linear, minimal, reversed, single, torus和tree类型，但有时候这些类型无法满足需求，需要自定义topo

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$ mn --help
Usage: mn [options]
(type mn -h for details)

...

  --topo=TOPO           linear|minimal|reversed|single|torus|tree[,param=value
                        ...] linear=LinearTopo torus=TorusTopo tree=TreeTopo
                        single=SingleSwitchTopo
                        reversed=SingleSwitchReversedTopo minimal=MinimalTopo

获取示例

Mininet提供了topo-2sw-2host的示例，可以通过Mininet github的custom目录下获取

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"""Custom topology example
Two directly connected switches plus a host for each switch:
   host --- switch --- switch --- host
Adding the 'topos' dict with a key/value pair to generate our newly defined
topology enables one to pass in '--topo=mytopo' from the command line.
"""

from mininet.topo import Topo

class MyTopo( Topo ):
    "Simple topology example."

    def __init__( self ):
        "Create custom topo."

        # Initialize topology
        Topo.__init__( self )

        # Add hosts and switches
        leftHost = self.addHost( 'h1' )
        rightHost = self.addHost( 'h2' )
        leftSwitch = self.addSwitch( 's3' )
        rightSwitch = self.addSwitch( 's4' )

        # Add links
        self.addLink( leftHost, leftSwitch )
        self.addLink( leftSwitch, rightSwitch )
        self.addLink( rightSwitch, rightHost )


topos = { 'mytopo': ( lambda: MyTopo() ) }

自定义topo

如要创建如下topo

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                         +------------+
              +----------+     s3     +---------+
              |          +------------+         |
              |                                 |
         +----+----+                       +----+----+
   +-----+    s1   +-----+           +-----+   s2    +-----+
   |     +---------+     |           |     +---------+     |
   |                     |           |                     |
+--+--+               +--+--+     +--+--+               +--+--+
| h1  |               | h2  |     | h3  |               | h4  |
+-----+               +-----+     +-----+               +-----+

代码

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from mininet.topo import Topo

class MyTopo( Topo ):
    "Simple topology example."

    def __init__( self ):
        "Create custom topo."

        # Initialize topology
        Topo.__init__( self )

        # Add hosts and switches
        h1 = self.addHost( 'h1' )
        h2 = self.addHost( 'h2' )
        h3 = self.addHost( 'h3' )
        h4 = self.addHost( 'h4' )
        s1 = self.addSwitch( 's1' )
        s2 = self.addSwitch( 's2' )
        s3 = self.addSwitch( 's3' )

        # Add links
        self.addLink( h1, s1 )
        self.addLink( s1, h2 )
        self.addLink( s1, s3 )
        self.addLink( s3, s2 )
        self.addLink( h3, s2 )
        self.addLink( s2, h4 )


topos = { 'mytopo': ( lambda: MyTopo() ) }

使用自定义topo

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root@mininet:~# mn --custom ./testtopo.py --topo mytopo --controller=remote,ip=127.0.0.1,port=6633
*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2 h3 h4
*** Adding switches:
s1 s2 s3
*** Adding links:
(h1, s1) (h3, s2) (s1, h2) (s1, s3) (s2, h4) (s3, s2)
*** Configuring hosts
h1 h2 h3 h4
*** Starting controller
c0
*** Starting 3 switches
s1 s2 s3 ...
*** Starting CLI:
mininet>

查看连接状态

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mininet> links
h1-eth0<->s1-eth1 (OK OK)
h3-eth0<->s2-eth2 (OK OK)
s1-eth2<->h2-eth0 (OK OK)
s1-eth3<->s3-eth1 (OK OK)
s2-eth3<->h4-eth0 (OK OK)
s3-eth2<->s2-eth1 (OK OK)
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)
mininet>
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