damn...im so stupid...i forget to add the "--observe-links " argument when
starting the rest_topolgy.py. its working now...
2015-01-05 9:21 GMT+08:00 ocean shi <[email protected]>:
> i also met some problems about the topology information when using
> app/rest_topology.py. i could get the switches in the browser with
> http://127.0.0.1:8080/v1.0/topology/switches, but i couldn't get the
> links with /v1.0/topology/links, really strange :(
> im reading the codes now and wish i could find out the reason. The same to
> u, gud luck~
>
> 2015-01-05 2:41 GMT+08:00 Flavio Junior <[email protected]>:
>
>> Hi.
>>
>> Sometimes the topology discovery would not work for, apparently, no
>> reason. Are there any known bugs there?
>>
>> I know it's a huge pain to debug the topology discovery but if you can't
>> build the view of the topology then you won't be able to forward.
>>
>> What solved the problem was the order in which I would start mininet/ryu.
>> So try starting ryu after mininet if you are not doing that, or the
>> opposite if that's the case.
>>
>> Flavio Castro
>>
>> On Sun, Jan 04, 2015 at 8:27 AM, Padma Jayasankar <[email protected]>
>> wrote:
>>
>> HI,
>> I tried shortest path code with two topologies(with loops). For the
>> simple one with 3 switches it worked. But for the other with 9 switches it
>> displays the "list of links" as follows and when i try to ping, i got
>> "destination unreachable". I am not able to find the reason. Could u please
>> help to solve the issue? I have given the topology and the o/p below.
>>
>> *Topology:*
>> """Custom topology example
>> 2 hosts and 8 switches(with loops)
>>
>> """
>>
>> 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' )
>> midSwitch1 = self.addSwitch( 's4' )
>> midSwitch2 = self.addSwitch( 's5' )
>> midSwitch3 = self.addSwitch( 's6' )
>> midSwitch4 = self.addSwitch( 's7' )
>> midSwitch5 = self.addSwitch( 's8' )
>> midSwitch6 = self.addSwitch( 's9' )
>> midSwitch7 = self.addSwitch( 's10' )
>> rightSwitch = self.addSwitch( 's11' )
>>
>> # Add links
>> self.addLink( leftHost, leftSwitch )
>> self.addLink( leftSwitch, midSwitch1 )
>> self.addLink( leftSwitch, midSwitch4 )
>> self.addLink( midSwitch1, midSwitch2 )
>> self.addLink( midSwitch1, midSwitch6 )
>> self.addLink( midSwitch2, midSwitch3 )
>> self.addLink( midSwitch3, midSwitch7 )
>> self.addLink( midSwitch3, rightSwitch )
>> self.addLink( midSwitch6, midSwitch4 )
>> self.addLink( midSwitch4, midSwitch5 )
>> self.addLink( midSwitch5, midSwitch7 )
>> self.addLink( midSwitch5, rightSwitch )
>> self.addLink( rightSwitch, rightHost )
>>
>>
>> topos = { 'mytopo': ( lambda: MyTopo() ) }
>>
>> * Output*:
>> [('1a:5a:80:13:c6:88', 3), (3, '1a:5a:80:13:c6:88'), (3, 4), (3, 5), (3,
>> 7), (3, '7a:e0:42:3f:43:6c'), (3, '5a:ad:d3:ff:a3:bf'), (3,
>> 'ca:3d:88:e0:9a:ae'), (3, '9e:f3:a0:76:66:4d'), (3, '5e:aa:98:96:4d:35'),
>> (3, 'd6:c8:2f:4f:c6:0d'), (4, 3), (4, 5), (4, '0e:2a:7b:f8:01:93'), (4,
>> '1e:8d:b2:c4:1b:4c'), (4, 9), (4, '92:a9:20:d5:53:db'), (4,
>> '22:61:b2:eb:8e:b4'), (4, '0a:9c:68:b3:ca:bc'), (4, '7e:80:62:59:a2:bc'),
>> (4, '3e:71:c4:4a:c7:41'), (5, 3), (5, 4), (5, 6), (5, 'f2:60:bf:5e:48:85'),
>> (5, '06:b1:18:f4:97:c1'), (5, '06:21:a5:1e:f5:a2'), (5,
>> '0a:be:81:3b:ff:4d'), (5, '6e:75:10:aa:61:14'), (6, '72:1d:1a:4f:6d:63'),
>> (6, 10), (6, 5), (6, '52:72:8d:59:c9:bb'), (7, 'b2:82:29:6b:0a:f5'), (7,
>> 3), (7, 8), (7, 9), (7, '9e:8f:84:40:03:40'), (7, '56:95:25:54:ce:02'), (8,
>> '06:05:ce:ee:71:87'), (8, '26:11:6f:94:9d:ca'), (8, 'fa:f6:43:45:19:4d'),
>> (8, 7), (8, 10), (8, 'de:0f:9b:2b:49:bd'), (9, 4), (9,
>> '9a:a4:04:22:4a:75'), (9, '3e:81:2f:d8:c7:77'), (9, 7), (10, 8), (10,
>> '42:0b:0f:4a:da:55'), (10, '2a:9e:7c:68:48:5d'), (10, 6), (10,
>> 'e2:fd:fc:c4:06:45'), ('ca:3d:88:e0:9a:ae', 3), ('5e:aa:98:96:4d:35', 3),
>> ('2a:9e:7c:68:48:5d', 10), ('fa:f6:43:45:19:4d', 8), ('0a:be:81:3b:ff:4d',
>> 5), ('92:a9:20:d5:53:db', 4), ('f2:60:bf:5e:48:85', 5),
>> ('5a:ad:d3:ff:a3:bf', 3), ('06:b1:18:f4:97:c1', 5), ('0a:9c:68:b3:ca:bc',
>> 4), ('e2:fd:fc:c4:06:45', 10), ('3e:71:c4:4a:c7:41', 4),
>> ('b2:82:29:6b:0a:f5', 7), ('0e:2a:7b:f8:01:93', 4), ('7a:e0:42:3f:43:6c',
>> 3), ('7e:80:62:59:a2:bc', 4), ('9a:a4:04:22:4a:75', 9),
>> ('9e:f3:a0:76:66:4d', 3), ('6e:75:10:aa:61:14', 5), ('06:05:ce:ee:71:87',
>> 8), ('26:11:6f:94:9d:ca', 8), ('de:0f:9b:2b:49:bd', 8),
>> ('3e:81:2f:d8:c7:77', 9), ('1e:8d:b2:c4:1b:4c', 4), ('9e:8f:84:40:03:40',
>> 7), ('22:61:b2:eb:8e:b4', 4), ('42:0b:0f:4a:da:55', 10),
>> ('06:21:a5:1e:f5:a2', 5), ('72:1d:1a:4f:6d:63', 6), ('52:72:8d:59:c9:bb',
>> 6), ('56:95:25:54:ce:02', 7), ('d6:c8:2f:4f:c6:0d', 3)]
>>
>>
>>
>> On Wed, Dec 31, 2014 at 10:00 PM, Flavio Junior <[email protected]>
>> wrote:
>>
>>> Yes, I had a 5 nodes ring topology and it worked fine.
>>>
>>> But the flood actions are probably causing a flood storm.
>>>
>>> Spanning tree is not added to the code. It shouldn't be hard to add it
>>> thou.
>>>
>>> I created this post
>>> <http://sdn-lab.com/2014/12/25/shortest-path-forwarding-with-openflow-on-ryu/#more-108>
>>> in my blog trying to explain the code a little better.
>>>
>>>
>>> Flávio Castro Jr.
>>> MSCS student at Georgia Tech
>>> B.S.E in Networks Engineering from the University of Brasilia.
>>> CCNA Certified
>>> (404) 660-9373
>>>
>>> On Wed, Dec 31, 2014 at 10:16 AM, Padma Jayasankar <[email protected]>
>>> wrote:
>>>
>>>> HI,
>>>> Will this code work for the networks which have loops. If not, is it
>>>> possible to incorporate this code with simple_switch_stp.py? Please
>>>> clarify.
>>>>
>>>> Thanks and Regards,
>>>> Padma V
>>>>
>>>> On Fri, Dec 19, 2014 at 6:20 AM, Flavio Junior <[email protected]>
>>>> wrote:
>>>>
>>>>> I just posted it to github here: https://github.com/castroflavio/ryu
>>>>>
>>>>> Please take a look at the code (shortestpath.py). The most important
>>>>> parts are the networkx SP computation and the topology discovery
>>>>> (ryu.topology). Networkx is a python library to do graph operations.
>>>>>
>>>>> We just finished the project, so I wasn't able to delete unnecessary
>>>>> info there. Feel free to modify it and add your name to the list of
>>>>> collaborators. Also, if you use our code as starting point I'd be
>>>>> extremely
>>>>> glad if recognize it on your code.
>>>>>
>>>>> It's a very simple code. If you still have doubts after spending some
>>>>> time reading I'll be glad to answer your questions.
>>>>>
>>>>> *Flávio Jr*
>>>>>
>>>>> (61) 8448-4003
>>>>>
>>>>> On Thu, Dec 18, 2014 at 6:35 PM, Padma Jayasankar <[email protected]
>>>>> > wrote:
>>>>>>
>>>>>> Hi,
>>>>>> Thanks for the info..But i haven't used networkx earlier..I have to
>>>>>> do the shortest path calculation in openflow networks..If i ues networkx,
>>>>>> can it be used with openflow(Am using Mininet,Ryu and OVS). Please
>>>>>> clarify.
>>>>>>
>>>>>> Thanks and Regards,
>>>>>> Padma V
>>>>>>
>>>>>> On Thu, Dec 18, 2014 at 10:08 PM, Flavio Junior <
>>>>>> [email protected]> wrote:
>>>>>>>
>>>>>>> I've done shortest path forwarding using networkx. You can get the
>>>>>>> topology using the get topology api.
>>>>>>>
>>>>>>> I haven't posted my code to github yet, but I'll do it asap. Let me
>>>>>>> know if there are other solutions.
>>>>>>>
>>>>>>> On Thu, Dec 18, 2014 at 10:41 AM, Padma Jayasankar <
>>>>>>> [email protected]> wrote:
>>>>>>>
>>>>>>> Hi All,
>>>>>>> I am new to Rye. I went through ryu ebook to know the basics. For my
>>>>>>> project , i have to find the backup path along with working path when a
>>>>>>> ping request comes. Am using Mininet , OVS and Ryu. Earlier i used POX
>>>>>>> and
>>>>>>> used the l2_multi that computes the shortest path by accessing the
>>>>>>> topology. Now as i want to use openflow 1.3 features , i am moving to
>>>>>>> Ryu.
>>>>>>> In Ryu is thee any app which is equivalent to l2_multi. If not is it
>>>>>>> possible to write such one..If yes, please give some guidance.
>>>>>>>
>>>>>>> Thanks and Regards,
>>>>>>> Padma V
>>>>>>>
>>>>>>>
>>>>>
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>>>>>
>>>>>
>>>>
>>>
>>
>>
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>
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