Create a Custom Topology in Mininet (1)

Create a custom topology shown as figure 1 and run in Mininet
alt topology

Figure 1
Create a python file

vi ~/minint/custom/multi-hosts.py

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
        Host1 = self.addHost( 'h1' )
        Host2 = self.addHost( 'h2' )
        Host3 = self.addHost( 'h3' )
        Host4 = self.addHost( 'h4' )
        Switch1 = self.addSwitch('s1')
        Switch2 = self.addSwitch('s2')
        # Add links
        self.addLink( Host1, Switch1 )
        self.addLink( Host2, Switch1 )
        self.addLink( Host3, Switch2 )
        self.addLink( Host4, Switch2 )
        self.addLink( Switch1, Switch2 )
topos = { 'mytopo': ( lambda: MyTopo() ) }

Start the topology and enter Mininet CLI
run

mininet@mininet-vm:~$ sudo mn --custom ./mininet/custom/multi-hosts.py --topo=mytopo

***Creating network
***Adding controller
***Adding hosts:
h1 h2 h3 h4
***Adding switches:
s1 s2
***Adding links:
(h1, s1) (h2, s1) (h3, s2) (h4, s2) (s1, s2) ***Configuring hosts
h1 h2 h3 h4
***Starting controller
c0
***Starting 2 switches
s1 s2
***Starting CLI:
mininet>

Display nodes

mininet> nodes  
available nodes are:  
c0 h1 h2 h3 h4 s1 s2

Display links

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

Display net

mininet> net  
h1 h1-eth0:s1-eth1  
h2 h2-eth0:s1-eth2  
h3 h3-eth0:s2-eth1  
h4 h4-eth0:s2-eth2  
s1 lo:  s1-eth1:h1-eth0 s1-eth2:h2-eth0 s1-eth3:s2-eth3  
s2 lo:  s2-eth1:h3-eth0 s2-eth2:h4-eth0 s2-eth3:s1-eth3  
c0

Display h1's interface configuration

mininet> h1 ifconfig  
h1-eth0   Link encap:Ethernet  HWaddr 8e:4f:d8:24:e1:e6  
          inet addr:10.0.0.1  Bcast:10.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::8c4f:d8ff:fe24:e1e6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:17 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1326 (1.3 KB)  TX bytes:648 (648.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Menu