[pox-dev] Defining Dictionary in POX controller

[Sayed Qaiser Ali Shah]

Ok thank you I will check it out.


On Fri, Nov 15, 2013 at 5:54 PM, Murphy McCauley
<murphy.mccauley at gmail.com>wrote:

> I'm just suggesting you work backwards to find the problem.  Use Wireshark
> to monitor the traffic to help determine where the duplicates are coming
> from.  If they're coming from a switch, I suggest you inspect the table on
> that switch to see which table entry the switch.  Then analyze the OpenFlow
> traffic to that switch to find the OpenFlow messages which installed the
> problematic entries.  Then analyze your controller code to see where you
> sent those problematic entries.
>
> -- Murphy
>
>
> On Nov 15, 2013, at 4:49 AM, Sayed Qaiser Ali Shah <
> 11msitqshah at seecs.edu.pk> wrote:
>
> Thank you so much. Yes you are right about what you said but is there is
> any other way, so that I can do this. I can read individual entries
> statically but the problem is I want to get it dynamic.
> Like I can print individual entries by using:
>
> print self.macaddrtable[1]
> print self.macaddrtable[2]
> print self.macaddrtable[3]
> print self.macaddrtable[4]
>
> To get desired result dynamically I used loop. But you know what I got. :(
>
>
> On Fri, Nov 15, 2013 at 3:36 PM, Murphy McCauley <
> murphy.mccauley at gmail.com> wrote:
>
>>
>> On Nov 15, 2013, at 2:20 AM, Sayed Qaiser Ali Shah <
>> 11msitqshah at seecs.edu.pk> wrote:
>>
>> Hello Murphy actually I am working on Traffic Engineering. I am now
>> learning that how to forward traffic when we have dictionary on controller.
>> I want to forward some entries of dictionary via queue-1 and some entries
>> via queue-2. For this I have created dictionary and it created successfully
>> with you help. Those entries of dictionary contain Source Mac Address and
>> Destination Mac address. I created 2 queues on Interface 1 of switch. I
>> then Pinged host 2 from host 1 and host 1 from host 3. It inserted four
>> entries in dictionary created on controller. Entries in Dictionary are
>> {1: (EthAddr('00:00:00:00:00:02'), EthAddr('00:00:00:00:00:01')),
>>  2: (EthAddr('00:00:00:00:00:01'), EthAddr('00:00:00:00:00:02')),
>>  3: (EthAddr('00:00:00:00:00:01'), EthAddr('00:00:00:00:00:03')),
>>  4: (EthAddr('00:00:00:00:00:03'), EthAddr('00:00:00:00:00:01')) }
>> Dear Murphy you asked earlier that you didn't get what I wanted to do. I
>> think that I am just explaining it in easy way that I just want to forward
>> two entries of dictionary via queue-1 and other 2 entries of dictionary via
>> queue-2. I am just doing practice on different techniques of Traffic
>> Engineering.  I used the following code for forwarding traffic via queues:
>>
>> if self.macaddrtable=='':      //When we have no entry in macaddrtable
>> dictionary
>>         queue=1
>>         msg.actions.append(of.ofp_action_enqueue(port = port, queue_id =
>> queue))
>> else:
>>     for a in self.macaddrtable:
>>          if a<=2:
>>             queue=1
>>             msg.actions.append(of.ofp_action_enqueue(port = port,
>> queue_id = queue))
>>          elif a>2:
>>             queue=2
>>             msg.actions.append(of.ofp_action_enqueue(port = port,
>> queue_id = queue))
>>
>> The code worked fine and forwarded traffic via desired queues but after
>> about 10 seconds of pinging, duplicate packets were detected. I don't know
>> why duplicate packets were detected. Can you please tell the reason?
>>
>>
>> My best guesses are that you are somehow creating a flow entry with
>> multiple actions or a loop, but it's hard to say.  I'd suggest that you try
>> to use Wireshark or a similar tool to figure out where the duplicates are
>> coming from.  You should see the duplicates at the port of the destination
>> host and the egress port of the last switch.  Work backwards from there.
>>  If you find the source of the duplications is a switch, examine the flow
>> table of that switch and see if you can spot the reason.
>>
>> -- Murphy
>>
>> On Tue, Nov 12, 2013 at 2:00 AM, Murphy McCauley <
>> murphy.mccauley at gmail.com> wrote:
>>
>>> It's still hard for me to answer questions since I still don't know what
>>> you're really trying to accomplish here.
>>>
>>> If you want entries to time out on the switch, set timeouts when
>>> installing the table entry (sending the flow_mod).  If you want
>>> notifications when flows are removed on the switch, that's also an option
>>> you can set when installing the entry; then listen to the FlowRemoved event
>>> to tell when it has actually happened.
>>>
>>> I'm not sure what you mean by "exact mac".  Your code records the
>>> address the packets were sent to.  If they were sent to the broadcast
>>> address, then... that's the destination.
>>>
>>> -- Murphy
>>>
>>> On Nov 11, 2013, at 9:42 AM, Sayed Qaiser Ali Shah <
>>> 11msitqshah at seecs.edu.pk> wrote:
>>>
>>> Thank you so much Murphy for your help. I did it the way you explained.
>>> But how can I refresh entries in the table. i.e. how to set idle timeout
>>> and hard timeout for this so that the table can be refreshed or how the
>>> entries can be updated when a flow is removed from flow table on Switch.
>>> Another Problem is:
>>> The code is as below.
>>>
>>> if (packet.src,packet.dst) not in self.macaddrs and
>>> (packet.dst,packet.src) not in self.macaddrs:
>>>         self.macaddrs.add((packet.src,packet.dst))
>>>         self.macaddrtable[f_id]=(packet.src,packet.dst)
>>>         f_id=f_id+1
>>> print "Mac Table is "
>>> print self.macaddrtable
>>>
>>> When I created a topology with 3 hosts the following result was shown
>>>
>>> Mac Table is
>>> {1: (EthAddr('00:00:00:00:00:01'), EthAddr('ff:ff:ff:ff:ff:ff')), 2:
>>> (EthAddr('00:00:00:00:00:02'), EthAddr('00:00:00:00:00:01')), 3:
>>> (EthAddr('00:00:00:00:00:03'), EthAddr('00:00:00:00:00:01')), 4:
>>> (EthAddr('00:00:00:00:00:02'), EthAddr('ff:ff:ff:ff:ff:ff')), 5:
>>> (EthAddr('00:00:00:00:00:03'), EthAddr('00:00:00:00:00:02'))}
>>>
>>> The result I expected is little bit different in terms of broadcast
>>> address. Like in 1 destination mac is ff:ff:ff:ff:ff:ff but I was expecting
>>> 00:00:00:00:00:02 and similar is the case with some other entries as well.
>>> Is there any way so that I can get desired exact mac, not broadcast?
>>>
>>>
>>>
>>> On Sun, Nov 10, 2013 at 5:00 AM, Murphy McCauley <
>>> murphy.mccauley at gmail.com> wrote:
>>>
>>>> It sounds like you need to record them as a pair to get what you want,
>>>> so ... put them in as a pair.
>>>>
>>>> It looks like I may have been responsible for the problem you were
>>>> seeing -- a little typo inserted an errant right square bracket.  Try:
>>>> self.macaddrs.add((packet.src,packet.dst))
>>>>
>>>> It's still not clear from context whether ordering matters to you (is A
>>>> sending to B the same as B sending to A?).  If it isn't, you might want to
>>>> sort the two addresses or just check for both...
>>>>
>>>> if (packet.src,packet.dst) not in self.macaddrs and
>>>> (packet.dst,packet.src) not in self.macaddrs:
>>>>
>>>> -- Murphy
>>>>
>>>> On Nov 9, 2013, at 3:32 PM, Sayed Qaiser Ali Shah <
>>>> 11msitqshah at seecs.edu.pk> wrote:
>>>>
>>>> Thank you so much Murphy. I tried it but got little problem in add
>>>> function i.e. when I used
>>>> self.macaddrs.add((packet.src,packet.dst])) it generated error in this
>>>> function then I tried
>>>> self.macaddrs.add(packet.src,packet.dst)
>>>> It also generated an error that add must have 1 argument where as 2
>>>> given. Then I tried
>>>>
>>>> if (packet.src,packet.dst) not in self.macaddrs:
>>>>   self.macaddrs.add(packet.src)
>>>>   self.macaddrs.add(packet.dst)
>>>>   self.macaddrtable[f_id]=(packet.src,packet.dst)
>>>>   f_id=f_id+1
>>>>
>>>> It didn't generate an error and I didn't get any repeated result but
>>>> there was some problem in the code I got results as below.
>>>> When I ping host1 from host 2 it added record in dictionary. Then I
>>>> ping host 3 from h1 record was inserted again but the problem was, as
>>>> record of host 1, host 2 and host 3 was saved in macaddrs and two records
>>>> were there but when I pinged the hosts present in macaddrs i.e. 1, 2, 3
>>>> like I ping host 2 from h3 as record was not present in macaddrtable still
>>>> record was not added to dictionary. It is because addresses are saving in
>>>> macaddrs one by one individually i.e. first source and then destination
>>>> address. When packet arrives controller it checks for source and
>>>> destination address in macaddrs as when there are individual record of each
>>>> host it then doesn't execute IF body because source and destination
>>>> addresses are already there as individual address. What to do with this????
>>>> Kindly help.
>>>>
>>>>
>>>> On Sun, Nov 10, 2013 at 3:26 AM, Murphy McCauley <
>>>> murphy.mccauley at gmail.com> wrote:
>>>>
>>>>> One possible answer is that you should keep a set of the ones you've
>>>>> added so far...
>>>>> self.macaddrtable = {}
>>>>> self.macaddrs = set()
>>>>>
>>>>> ...
>>>>>
>>>>> if (packet.src,packet.dst) not in self.macaddrs:
>>>>>   self.macaddrs.add((packet.src,packet.dst]))
>>>>>   self.macaddrtable[f_id]=(packet.src,packet.dst)
>>>>>   f_id=f_id+1
>>>>>
>>>>>
>>>>> There might be better things to be done, but it's impossible to say
>>>>> without knowing more (e.g., what you're trying to accomplish, what f_id is
>>>>> used for, etc.).
>>>>>
>>>>> -- Murphy
>>>>>
>>>>> On Nov 9, 2013, at 10:35 AM, Sayed Qaiser Ali Shah <
>>>>> 11msitqshah at seecs.edu.pk> wrote:
>>>>>
>>>>> > Hello everybody,
>>>>> >
>>>>> > I have defined dictionary in POX controller and I by the name
>>>>> addrtable and I am saving two things in this dictionary i.e. Source mac and
>>>>> destination mac. What I have done is
>>>>> >
>>>>> >     self.macaddrtable = {}
>>>>> > ...
>>>>> >     f_id=1
>>>>> >     self.macaddrtable[f_id]={packet.src, packet.dst}
>>>>> >     print self.macaddrtable
>>>>> >     f_id=f_id+1
>>>>> >
>>>>> > It is saving source mac and destination mac in the dictionary but
>>>>> the problem is when f_id increases it then save same source and destination
>>>>> mac again and again.
>>>>> > What I want is to save mac address only if its not in dictionary.
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>>
>>>>
>>>>
>>>>
>>>> *Regards Sayed Qaiser Ali ShahMSIT-12 NUST (SEECS)*
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>>
>>>
>>>
>>>
>>> *Regards Sayed Qaiser Ali ShahMSIT-12 NUST (SEECS)*
>>>
>>>
>>>
>>
>>
>> --
>>
>>
>>
>>
>> *Regards Sayed Qaiser Ali ShahMSIT-12 NUST (SEECS)*
>>
>>
>>
>
>
> --
>
>
>
>
> *Regards Sayed Qaiser Ali ShahMSIT-12 NUST (SEECS)*
>
>
>


-- 




*RegardsSayed Qaiser Ali ShahMSIT-12NUST (SEECS)*
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