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Add bridges s1-s3 to topology and explain some details

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This commit is contained in:
Bob Lantz
2015-01-17 13:38:55 -08:00
parent 026130bd5f
commit 6da3fcdef1
1 changed files with 34 additions and 21 deletions
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examples/linuxrouter.py
+34 -21
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@@ -6,20 +6,23 @@ linuxrouter.py: Example network with Linux IP router
This example converts a Node into a router using IP forwarding
already built into Linux.
The topology contains a router with three IP subnets:
- 192.168.1.0/24 (interface IP: 192.168.1.1)
- 172.16.0.0/12 (interface IP: 172.16.0.1)
- 10.0.0.0/8 (interface IP: 10.0.0.1)
The example topology creates a router and three IP subnets:
It also contains three hosts, one in each subnet:
- h1 (IP: 192.168.1.100)
- h2 (IP: 172.16.0.100)
- h3 (IP: 10.0.0.100)
- 192.168.1.0/24 (r0-eth1, IP: 192.168.1.1)
- 172.16.0.0/12 (r0-eth2, IP: 172.16.0.1)
- 10.0.0.0/8 (r0-eth3, IP: 10.0.0.1)
Routing entries can be added to the routing tables of the
hosts or router using the "ip route add" or "route add" command.
See the man pages for more details.
Each subnet consists of a single host connected to
a single switch:
r0-eth1 - s1-eth1 - h1-eth0 (IP: 192.168.1.100)
r0-eth2 - s2-eth1 - h2-eth0 (IP: 172.16.0.100)
r0-eth3 - s3-eth1 - h3-eth0 (IP: 10.0.0.100)
The example relies on default routing entries that are
automatically created for each interface. Additional
routes may be added to the router or hosts by executing
'ip route' or 'route' commands on the router or hosts.
"""
from mininet.topo import Topo
@@ -42,29 +45,39 @@ class LinuxRouter( Node ):
class NetworkTopo( Topo ):
"A simple topology of a router with three subnets (one host in each)."
"A LinuxRouter connecting three IP subnets"
def build( self, **_opts ):
router = self.addNode( 'r0', cls=LinuxRouter, ip='192.168.1.1/24' )
defaultIP='192.168.1.1/24' # IP address for r0-eth1
router = self.addNode( 'r0', cls=LinuxRouter, ip=defaultIP )
s1, s2, s3 = [ self.addSwitch( s ) for s in 's1', 's2', 's3' ]
self.addLink( s1, router, intfName2='r0-eth1',
params2={ 'ip' : defaultIP } ) # for clarity
self.addLink( s2, router, intfName2='r0-eth2',
params2={ 'ip' : '172.16.0.1/12' } )
self.addLink( s3, router, intfName2='r0-eth3',
params2={ 'ip' : '10.0.0.1/8' } )
h1 = self.addHost( 'h1', ip='192.168.1.100/24',
defaultRoute='via 192.168.1.1' )
h2 = self.addHost( 'h2', ip='172.16.0.100/12',
defaultRoute='via 172.16.0.1' )
h3 = self.addHost( 'h3', ip='10.0.0.100/8',
defaultRoute='via 10.0.0.1' )
self.addLink( h1, router, intfName2='r0-eth1',
params2={ 'ip' : '192.168.1.1/24' } )
self.addLink( h2, router, intfName2='r0-eth2',
params2={ 'ip' : '172.16.0.1/12' } )
self.addLink( h3, router, intfName2='r0-eth3',
params2={ 'ip' : '10.0.0.1/8' } )
for h, s in [ (h1,s1), (h2,s2), (h3,s3) ]:
self.addLink( h, s )
def run():
"Test linux router"
topo = NetworkTopo()
net = Mininet( topo=topo, controller=None ) # no controller needed
net = Mininet( topo=topo ) # controller is used by s1-s3
net.start()
info( '*** Routing Table on Router\n' )
info( '*** Routing Table on Router:\n' )
print net[ 'r0' ].cmd( 'route' )
CLI( net )
net.stop()