[pox-dev] Defining Dictionary in POX controller

[Sayed Qaiser Ali Shah]

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)*
>
>
>


-- 




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