[pox-dev] Defining Dictionary in POX controller

[Sayed Qaiser Ali Shah]

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.
>
>


-- 




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