我使用mininet模拟线性拓扑，3个交换机相互连接，一个主机连接到每个交换机。看起来像this。
我使用github上提供的mobility script在mininet内执行移动性。该脚本使用Mininet的默认控制器。
现在我想使用远程Opendaylight控制器来执行移动性，或者更具体地说，将h1从s1移动到s2然后再移回到s2。
我的代码是原始移动脚本的修改版本。更改在mobilityTest（）方法中，并添加了CLI以进行调试。
#!/usr/bin/python
"""
Simple example of Mobility with Mininet
(aka enough rope to hang yourself.)
We move a host from s1 to s2, s2 to s3, and then back to s1.
Gotchas:
The reference controller doesn't support mobility, so we need to
manually flush the switch flow tables!
Good luck!
to-do:
- think about wifi/hub behavior
- think about clearing last hop - why doesn't that work?
"""
from mininet.node import RemoteController
from mininet.net import Mininet
from mininet.node import OVSSwitch
from mininet.topo import LinearTopo
from mininet.log import info, output, warn, setLogLevel
from mininet.examples.clustercli import CLI
from random import randint
import time
class MobilitySwitch( OVSSwitch ):
"Switch that can reattach and rename interfaces"
def delIntf( self, intf ):
"Remove (and detach) an interface"
port = self.ports[ intf ]
del self.ports[ intf ]
del self.intfs[ port ]
del self.nameToIntf[ intf.name ]
def addIntf( self, intf, rename=False, **kwargs ):
"Add (and reparent) an interface"
OVSSwitch.addIntf( self, intf, **kwargs )
intf.node = self
if rename:
self.renameIntf( intf )
def attach( self, intf ):
"Attach an interface and set its port"
port = self.ports[ intf ]
if port:
if self.isOldOVS():
self.cmd( 'ovs-vsctl add-port', self, intf )
else:
self.cmd( 'ovs-vsctl add-port', self, intf,
'-- set Interface', intf,
'ofport_request=%s' % port )
self.validatePort( intf )
def validatePort( self, intf ):
"Validate intf's OF port number"
ofport = int( self.cmd( 'ovs-vsctl get Interface', intf,
'ofport' ) )
if ofport != self.ports[ intf ]:
warn( 'WARNING: ofport for', intf, 'is actually', ofport,
'\n' )
def renameIntf( self, intf, newname='' ):
"Rename an interface (to its canonical name)"
intf.ifconfig( 'down' )
if not newname:
newname = '%s-eth%d' % ( self.name, self.ports[ intf ] )
intf.cmd( 'ip link set', intf, 'name', newname )
del self.nameToIntf[ intf.name ]
intf.name = newname
self.nameToIntf[ intf.name ] = intf
intf.ifconfig( 'up' )
def moveIntf( self, intf, switch, port=None, rename=True ):
"Move one of our interfaces to another switch"
self.detach( intf )
self.delIntf( intf )
switch.addIntf( intf, port=port, rename=rename )
switch.attach( intf )
def printConnections( switches ):
"Compactly print connected nodes to each switch"
for sw in switches:
output( '%s: ' % sw )
for intf in sw.intfList():
link = intf.link
if link:
intf1, intf2 = link.intf1, link.intf2
remote = intf1 if intf1.node != sw else intf2
output( '%s(%s) ' % ( remote.node, sw.ports[ intf ] ) )
output( '\n' )
def moveHost( host, oldSwitch, newSwitch, newPort=None ):
"Move a host from old switch to new switch"
hintf, sintf = host.connectionsTo( oldSwitch )[ 0 ]
oldSwitch.moveIntf( sintf, newSwitch, port=newPort )
return hintf, sintf
def mobilityTest():
"A simple test of mobility"
info( '* Simple mobility test\n' )http://localhost:8181/restconf/operational/opendaylight-inventory:nodes/
net = Mininet( topo=LinearTopo( 3 ), controller=lambda a: RemoteController( a, ip='127.0.0.1', port=6653), switch=MobilitySwitch )
info( '* Starting network:\n' )
net.start()
printConnections( net.switches )
info( '* Testing network\n' )
time.sleep( 3 )
net.pingAll()
info( '* Identifying switch interface for h1\n' )
h1, old = net.get( 'h1', 's1' )
CLI( net )
for s in 2, 3, 1:
new = net[ 's%d' % s ]
port = randint( 10, 20 )
info( '* Moving', h1, 'from', old, 'to', new, 'port', port, '\n' )
hintf, sintf = moveHost( h1, old, new, newPort=port )
info( '*', hintf, 'is now connected to', sintf, '\n' )
info( '* Clearing out old flows\n' )
for sw in net.switches:
sw.dpctl( 'del-flows' )
info( '* Add flow rule\n' )
CLI( net )
info( '* New network:\n' )
printConnections( net.switches )
info( '* Testing connectivity:\n' )
net.pingAll()
old = new
net.stop()
if __name__ == '__main__':
setLogLevel( 'info' )
mobilityTest()
运行脚本时，线性拓扑成功设置，我可以在ODL控制器的delux GUI中看到。我也可以在所有主机之间ping。
执行移动性并且h1连接到s2时会出现问题。 Ping不再起作用了。
使用流规则将流表填充到控制器并没有解决问题。
mininet> dpctl add-flow "table=0, priority=100,dl_type=0x88cc actions=CONTROLLER:65535"
*** s1 ------------------------------------------------------------------------
*** s2 ------------------------------------------------------------------------
*** s3 ------------------------------------------------------------------------
mininet> dpctl dump-flows
*** s1 ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x0, duration=7.914s, table=0, n_packets=0, n_bytes=0, idle_age=7, priority=100,dl_type=0x88cc actions=CONTROLLER:65535
*** s2 ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x0, duration=7.916s, table=0, n_packets=1, n_bytes=85, idle_age=2, priority=100,dl_type=0x88cc actions=CONTROLLER:65535
*** s3 ------------------------------------------------------------------------
NXST_FLOW reply (xid=0x4):
cookie=0x0, duration=7.917s, table=0, n_packets=1, n_bytes=85, idle_age=2, priority=100,dl_type=0x88cc actions=CONTROLLER:65535
mininet> pingall
*** Ping: testing ping reachability
h1 -> X X
h2 -> X X
h3 -> X X
*** Results: 100% dropped (0/6 received)
然后当我尝试从h1 ping到h2时，我用tcpdump监视所有接口，现在它们都连接到s2。 h1发出ARP请求，该请求由s2交换机接收，但该交换机s2不将ARP请求转发给其他交换机和主机。
我想知道为什么我的ping在执行移动性后不再起作用了。
非常感谢任何帮助。
由于