Multipath routing with Ryu and Pyretic SDN Controllers
License: MIT License
File "/home/xxxx/ryu/ryu/app/ryu_multipath.py", line 229, in install_paths
return paths_with_ports[0][src][1]
When I want to run this experiment, the CMD reports this error. Then, we discover the controller cannot get the global view of the network by self.adjacency[node], defaultdict.
Can you tell me how to solve this problem? Whether the other files are changed？
Thank you!
I think this code doesn't install a group table into switch for ARP packet if there is a loop, which may cause severe ARP storm when the topology contains lots of loops(e.g., FAT Tree).
What do you need to run on 127.0.0.1:8008?
I have the following issue in the ryu log:
hub: uncaught exception: Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/ryu/lib/hub.py", line 77, in _launch
return func(*args, **kwargs)
File "/home/ryu/ryu/app/ryu_multipath.py", line 111, in measure_link
r = get(url)
File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/api.py", line 67, in get
return request('get', url, params=params, **kwargs)
File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/api.py", line 53, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/sessions.py", line 468, in request
resp = self.send(prep, **send_kwargs)
File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/sessions.py", line 576, in send
r = adapter.send(request, **kwargs)
File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/adapters.py", line 437, in send
raise ConnectionError(e, request=request)
ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=8008): Max retries exceeded with url: /metric/127.0.0.1/911.ifoutoctets/json (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7ff650cca0d0>: Failed to establish a new connection: [Errno 111] ECONNREFUSED',))
DFS only can find multipath.
if put multipath together,that will have loop.
how to fix that
I test your app in a linear topology without problems, but when I tried it on a topology with multipaths it doesn't reach the host.
mininet> h0 ping -c 3 h1
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
From 10.0.0.1 icmp_seq=1 Destination Host Unreachable
From 10.0.0.1 icmp_seq=2 Destination Host Unreachable
From 10.0.0.1 icmp_seq=3 Destination Host Unreachable
--- 10.0.0.2 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 1999ms
The network is the following:
mininet> net
h0 h0-eth0:s0-eth1
h1 h1-eth0:s7-eth1
s0 lo: s0-eth1:h0-eth0 s0-eth2:s1-eth1 s0-eth3:s3-eth1 s0-eth4:s5-eth1
s1 lo: s1-eth1:s0-eth2 s1-eth2:s2-eth1
s2 lo: s2-eth1:s1-eth2 s2-eth2:s7-eth2
s3 lo: s3-eth1:s0-eth3 s3-eth2:s4-eth1
s4 lo: s4-eth1:s3-eth2 s4-eth2:s7-eth3
s5 lo: s5-eth1:s0-eth4 s5-eth2:s6-eth1
s6 lo: s6-eth1:s5-eth2 s6-eth2:s7-eth4
s7 lo: s7-eth1:h1-eth0 s7-eth2:s2-eth2 s7-eth3:s4-eth2 s7-eth4:s6-eth2
controller
This is an extract of the info reported by ryu app:
Available paths from 7 to 138627926075983 : []
Path installation finished in 2.90870666504e-05
Available paths from 138627926075983 to 7 : []
Path installation finished in 7.86781311035e-06
Available paths from 7 to 138627926075983 : []
Path installation finished in 1.4066696167e-05
Available paths from 138627926075983 to 7 : []
Path installation finished in 6.91413879395e-06
Available paths from 7 to 138627926075983 : []
Path installation finished in 1.21593475342e-05
Available paths from 138627926075983 to 7 : []
Path installation finished in 5.96046447754e-06
Available paths from 7 to 138627926075983 : []
Path installation finished in 2.50339508057e-05
Available paths from 138627926075983 to 7 : []
Path installation finished in 9.05990600586e-06
Available paths from 7 to 138627926075983 : []
Path installation finished in 1.59740447998e-05
Available paths from 138627926075983 to 7 : []
Path installation finished in 8.10623168945e-06
Available paths from 7 to 138627926075983 : []
Path installation finished in 1.50203704834e-05
Available paths from 138627926075983 to 7 : []
Path installation finished in 8.82148742676e-06
can you help us?
I was learning about RYU controller and was trying to run this multipath program and i am getting this following errors.
/home/ubuntu/ryu/ryu/topology/switches.py:478: UserWarning: Datapath#ports is kept for compatibility with the previous openflow versions (< 1.3). This not be updated by EventOFPPortStatus message. If you want to be updated, you can use 'ryu.controller.dpset' or 'ryu.topology.switches'.
for port in dp.ports.values():
Available paths from 6 to 1 : []
Path installation finished in 0.000164031982422
hub: uncaught exception: Traceback (most recent call last):
File "/home/ubuntu/ryu/ryu/lib/hub.py", line 52, in _launch
func(*args, **kwargs)
File "/home/ubuntu/ryu/ryu/base/app_manager.py", line 275, in _event_loop
handler(ev)
File "/home/ubuntu/ryu/ryu/app/ryu_multipath.py", line 289, in _packet_in_handler
out_port = self.install_paths(h1[0], h1[1], h2[0], h2[1], src_ip, dst_ip)
File "/home/ubuntu/ryu/ryu/app/ryu_multipath.py", line 214, in install_paths
return paths_with_ports[0][src][1]
IndexError: list index out of range
I was running the code using own topology created a follows
from mininet.topo import Topo
class MyTopo(Topo):
def __init__(self):
Topo.__init__(self)
#add hosts and switches
h1 = self.addHost( 'H1' )
h2 = self.addHost( 'H2' )
s1 = self.addSwitch( 'S1' )
s2 = self.addSwitch( 'S2' )
s3 = self.addSwitch( 'S3' )
s4 = self.addSwitch( 'S4' )
s5 = self.addSwitch( 'S5' )
s6 = self.addSwitch( 'S6' )
#add links
self.addLink( h1, s1 )
self.addLink( h2, s6 )
self.addLink( s1, s2 )
self.addLink( s2, s3 )
self.addLink( s3, s6 )
self.addLink( s1, s4 )
self.addLink( s4, s5 )
self.addLink( s5, s6 )
topos = { 'mytopo': (lambda:MyTopo() ) }
please provide us some solution to overcome these errors
This message appears many times in the ryu console when I create the topology:
ProjectController: Exception occurred during handler processing. Backtrace from offending handler [switch_leave_handler] servicing event [EventSwitchLeave] follows.
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py", line 290, in _event_loop
handler(ev)
File "/usr/local/lib/python2.7/dist-packages/ryu/app/ryu_multipath.py", line 435, in switch_leave_handler
switch = event.dpid
AttributeError: 'EventSwitchLeave' object has no attribute 'dpid'
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