[pox-dev] working with multiple switches

[durga]

can someone take the pain of going through the below code and let me know
where i might be going wrong?

I di try compring the results with samples provided, and don't quite find
any errors (except that sample code is much cleaner ), but somehow my
sw1<-->h1(host1) cannot reach sw3<-->h3(host3).

Any insights would be wonderful as this has gotten a little exhaustive on
me.

Thank you.

Cheers!
Durga



On Fri, Nov 8, 2013 at 2:37 PM, durga <c.vijaya.durga at gmail.com> wrote:

> I am working on it as of now. I did use a macport table to store.Below
> debug() shows that, (a obvious error in my code), that the port number for
> input and outport are same, hence my ARP gets dropped. as inport ==
> outport.
>
> Will keep the group posted as soon i understand where I am going wrong.
>
> *log.debug("%i --> %s" event.dpid,parsedpkt)*
>
> my swtch output:
>
> DEBUG:openflow.of_01:Listening on 0.0.0.0:6633
>
>> INFO:openflow.of_01:[00-00-00-00-00-01 3] connected
>> DEBUG:l2_switching_v5:connected to switch with dpid 1
>> INFO:openflow.of_01:[00-00-00-00-00-04 1] connected
>> DEBUG:l2_switching_v5:connected to switch with dpid 4
>> INFO:openflow.of_01:[00-00-00-00-00-03 4] connected
>> DEBUG:l2_switching_v5:connected to switch with dpid 3
>> INFO:openflow.of_01:[00-00-00-00-00-02 2] connected
>> DEBUG:l2_switching_v5:connected to switch with dpid 2
>> DEBUG:l2_switching_v5:1 --> [00:00:00:00:00:01>ff:ff:ff:ff:ff:ff ARP]
>> {EthAddr('00:00:00:00:00:01'): 1}
>> DEBUG:l2_switching_v5:2 --> [00:00:00:00:00:01>ff:ff:ff:ff:ff:ff ARP]
>> {EthAddr('00:00:00:00:00:01'): 2}
>> DEBUG:l2_switching_v5:3 --> [00:00:00:00:00:01>ff:ff:ff:ff:ff:ff ARP]
>> {EthAddr('00:00:00:00:00:01'): 2}
>> DEBUG:l2_switching_v5:4 --> [00:00:00:00:00:01>ff:ff:ff:ff:ff:ff ARP]
>> {EthAddr('00:00:00:00:00:01'): 2}
>> DEBUG:l2_switching_v5:3 --> [00:00:00:00:00:03>00:00:00:00:00:01 ARP]
>> {EthAddr('00:00:00:00:00:03'): 1, EthAddr('00:00:00:00:00:01'): 2}
>> DEBUG:l2_switching_v5:2 --> [00:00:00:00:00:03>00:00:00:00:00:01 ARP]
>> {EthAddr('00:00:00:00:00:03'): 3, EthAddr('00:00:00:00:00:01'): 2}
>>
>> *DEBUG:l2_switching_v5:1 --> [00:00:00:00:00:03>00:00:00:00:00:01 ARP] *
>> *{EthAddr('00:00:00:00:00:03'): 2, EthAddr('00:00:00:00:00:01'): 2} *
>> *dropping*
>
>
>  expected:
>
>>
>>
>> *DEBUG:forwarding.l2_learning:1-->[00:00:00:00:00:01>00:00:00:00:00:03
>> IP]**{EthAddr('00:00:00:00:00:03'): 2, EthAddr('00:00:00:00:00:01'): 1}*
>
>
> Cheers!
> Durga
>
>
>
> On Fri, Nov 8, 2013 at 1:29 PM, Murphy McCauley <murphy.mccauley at gmail.com
> > wrote:
>
>> You'll see that the table is held in an instance variable
>> (self.macToPort).  self in this case is an instance of LearningSwitch.  And
>> the key here is that there's an instance of LearningSwitch for each switch
>> that connects (created by a ConnectionUp handler).
>>
>> -- Murphy
>>
>> On Nov 7, 2013, at 4:32 AM, durga <c.vijaya.durga at gmail.com> wrote:
>>
>> While, I am reading docs to work on vlans , I was as well experimenting
>> on using multiple switches.Without creating any complex topology, i stuck
>> to linear topology by running the below in mininet
>>
>> sudo mn --topo linear ,4 --mac --switch ovsk --controller remote
>>
>> which creates 5 links(h1<-->s1, h2<-->s2,s1<-->c0,s2<-->c0,s1<-->s2)
>> When I run the sample l2_learning switch module, h1 pings h2 successfully.
>> But how does the code differentiate between 2 ports if host 1 is
>> connected to port 1 of sw1( thus event.port ==1) and h2 is connected to
>> port1 of sw2(port == 1), then port == event.port condition might fail
>> right? (though it doesnot).
>>
>>  else:
>>         port = self.macToPort[packet.dst]
>>         if port == event.port: # 5
>>           # 5a
>>           log.warning("Same port for packet from %s -> %s on %s.%s.
>>  Drop."
>>               % (packet.src, packet.dst, dpid_to_str(event.dpid), port))
>>           drop(10)
>>           return
>>         # 6
>>
>>
>> the program I wrote, is failing at this very condition.
>>
>> Cheers!
>> Durga
>>
>>
>>
>
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