[pox-dev] Defining Dictionary in POX controller

[Sayed Qaiser Ali Shah]

Yup dear thank you so much. I will try this.
:)


On Wed, Nov 27, 2013 at 4:49 AM, Murphy McCauley
<murphy.mccauley at gmail.com>wrote:

> On Nov 26, 2013, at 12:26 PM, Sayed Qaiser Ali Shah <
> 11msitqshah at seecs.edu.pk> wrote:
>
> > Dear Murphy I tried a lot but I am unable to use the flag properly.
> Kindly help me out in the scenario. I want to remove all entries from
> dictionary defined after idle_time_out. The pseudocode is as below.
> >     msg.idle_timeout = 10
> >     if msg.idle_timeout== True:
> >         self.macaddrtable=' '
>
> This isn't the right logic.  You tell the switch you want a flow to expire
> if it has timed out.  Only the switch knows when this has happened.  If you
> want to find out at the controller, you need to switch to tell you.
>
> So when you install the flow entry with an idle_timeout, set the
> flow-mod's .flag attribute to OFPFF_SEND_FLOW_REM.
>
> Additionally, set a handler for the OpenFlow componet's FlowRemoved event.
>
> When the FlowRemoved handler is executed, it's because a flow has been
> removed.
>
> See the POX manual for more info on the FlowRemoved event and setting
> event handlers.
>
> As a last note, you probably want to do self.macaddrtable.clear() or
> something rather than assigning it to be an empty string?
>
> Hope that gets you started.
>
> -- Murphy
>
> > Kindly help me out because I am unable to do this.
> >
> >
> > On Sun, Nov 24, 2013 at 2:50 AM, Murphy McCauley <
> murphy.mccauley at gmail.com> wrote:
> > 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 <
> 11msitqshah at 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 <
> 11msitqshah at 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.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 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)
> >
> >
> >
> >
> > --
> > Regards
> >
> > Sayed Qaiser Ali Shah
> > MSIT-12
> > NUST (SEECS)
>
>


-- 




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