[pox-dev] Defining Dictionary in POX controller
Sayed Qaiser Ali Shah
11msitqshah at seecs.edu.pk
Sat Nov 23 06:28:39 PST 2013
I think so. I want to delete entry from dictionary defined on controller.
Thanks. I will try this.
On Sat, Nov 23, 2013 at 11:04 AM, Murphy McCauley <murphy.mccauley at gmail.com
> wrote:
>
> On Nov 22, 2013, at 12:57 PM, Sayed Qaiser Ali Shah <
> 11msitqshah at seecs.edu.pk> wrote:
>
> Hello Murphy McCauley,
>
> I solved the duplication problem now I want to refresh the dictionary I
> have defined after an idle_timeout. I want to set idle_timeout to 10. I
> tried this but didn't get what I wanted.
>
> msg.idle_timeout = 10
> if msg.idle_timeout== True:
> self.macaddrtable=' '
>
> This will destroy all entries in dictionary. Is there any other way so
> that only that entry whose idle_timeout has expired is removed and then
> rearrange remaining entries in dictionary.
> Just as a reminder. macaddrtable is dictionary defined which contains
> source and destination mac addresses. When a packet arrives controller its
> entry is saved in the dictionary macaddrtable.
>
>
> If you set the OFPFF_SEND_FLOW_REM flag when installing the table entry,
> you'll get a FlowRemoved event when it expires. Maybe that's what you need?
>
> -- Murphy
>
> On Fri, Nov 15, 2013 at 6:05 PM, Sayed Qaiser Ali Shah <
> 11msitqshah at seecs.edu.pk> wrote:
>
>> 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)*
>>>
>>>
>>>
>>
>>
>> --
>>
>>
>>
>>
>> *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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