Like the rest of OpenFlow, it's described in the OpenFlow specification:
http://archive.openflow.org/documents/openflow-spec-v1.0.0.pdf
Also, if you google "OFPFF_SEND_FLOW_REM pox" you should get several examples
of setting the flag.
In the POX wiki manual, there is some description of the FlowRemoved event and
of handling events in general.
-- Murphy
On Nov 23, 2013, at 10:51 AM, Sayed Qaiser Ali Shah <11msitqs...@seecs.edu.pk>
wrote:
> I tried to used OFPFF_SEND_FLOW_REM flag and also searched on net but didn't
> get any specific answer. Please tell me how to use this flag? or give me a
> link from which I can get help.
> Thanks
>
>
> On Sat, Nov 23, 2013 at 7:28 PM, Sayed Qaiser Ali Shah
> <11msitqs...@seecs.edu.pk> wrote:
> 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.mccau...@gmail.com>
> wrote:
>
> On Nov 22, 2013, at 12:57 PM, Sayed Qaiser Ali Shah
> <11msitqs...@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
>> <11msitqs...@seecs.edu.pk> wrote:
>> Ok thank you I will check it out.
>>
>>
>> On Fri, Nov 15, 2013 at 5:54 PM, Murphy McCauley <murphy.mccau...@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
>> <11msitqs...@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.mccau...@gmail.com> wrote:
>>>
>>> On Nov 15, 2013, at 2:20 AM, Sayed Qaiser Ali Shah
>>> <11msitqs...@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.mccau...@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
>>>> <11msitqs...@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.mccau...@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
>>>>> <11msitqs...@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.mccau...@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
>>>>>> <11msitqs...@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 Shah
>>>>>> MSIT-12
>>>>>> NUST (SEECS)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Regards
>>>>>
>>>>> Sayed Qaiser Ali Shah
>>>>> MSIT-12
>>>>> NUST (SEECS)
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Regards
>>>>
>>>> Sayed Qaiser Ali Shah
>>>> MSIT-12
>>>> NUST (SEECS)
>>>
>>>
>>>
>>>
>>> --
>>> Regards
>>>
>>> Sayed Qaiser Ali Shah
>>> MSIT-12
>>> NUST (SEECS)
>>
>>
>>
>>
>> --
>> Regards
>>
>> Sayed Qaiser Ali Shah
>> MSIT-12
>> NUST (SEECS)
>>
>>
>>
>> --
>> Regards
>>
>> Sayed Qaiser Ali Shah
>> MSIT-12
>> NUST (SEECS)
>
>
>
>
> --
> Regards
>
> Sayed Qaiser Ali Shah
> MSIT-12
> NUST (SEECS)
>
>
>
> --
> Regards
>
> Sayed Qaiser Ali Shah
> MSIT-12
> NUST (SEECS)
