[pox-dev] add rules proactively - send flow to two or more ports

[yona at gteccom.uff.br]

/Lucas and Murphy,

    First of all thank you very much for the reply./

    Citando Murphy McCauley <murphy.mccauley at gmail.com>:
>
>  
> On May 15, 2013, at 8:13 AM, yona at gteccom.uff.br wrote:
>
>> I´m using mininet and POX and I have two questions:
>> II) How do I add a flow_mod without being involved in an event? I  
>> want to install proactively rules in the switches, but I only have  
>> achieved this when listening events. I didn't find any such thing  
>> on Internet. When I make simple applications like the one below, it  
>> works, but I need to install rules proactively.
>>
>>
>  
> As Lucas Brasilino said, you could do this from a timer, but...  
> what's wrong with it being involved with an event?  Don't you just  
> need to pick the right event?
>      
> A common scenario is to install rules when a switch connects.  In  
> some sense, these are still "reactive".  It's just that they're not  
> reacting to PacketIn events -- they're reacting to ConnectionUp  
> events.  See misc.dnsspy for an example.  It makes sense to install  
> rules in response to this event, right?  You're not going to install  
> rules BEFORE the switch connects...
>  
> /My scenario is a little different, is known in advance and I would  
> like to reconfigure the entire network each time a new switch  
> connects.Thus, each event ConnectionUp, I would connect to the new  
> switch, but wouldn't have access to the other switches that need to  
> be reconfigured, right? Or not?/
>> II)How do I add a rule which sends a flow to two or more ports?  
>> Using dpctl just put the ports and it works well (e.g.  
>> in_port=2,actions=output:1,output:3), and in a application, how  
>> would I do that? I tried as above, which works weel when I have two  
>> ports, but when I need to install rules that sends flows to one and  
>> more ports together :
>> ...
>>        self._install(event.connection.dpid,2,(1,3))    
>> self._install(event.connection.dpid,1,2))
>>        ...
>>         
>> it doesn't work:
>>
>>   File "/home/mininet/pox/pox/lib/revent/revent.py", line 234, in  
>> raiseEventNoErrors
>>     return self.raiseEvent(event, *args, **kw)
>>   File "/home/mininet/pox/pox/lib/revent/revent.py", line 281, in raiseEvent
>>     rv = event._invoke(handler, *args, **kw)
>>   File "/home/mininet/pox/pox/lib/revent/revent.py", line 159, in _invoke
>>     return handler(self, *args, **kw)
>>   File "/home/mininet/pox/ext/swbasico2.py", line 36, in  
>> _handle_ConnectionUp
>>     self._install(event.connection.dpid,3,1)
>>   File "/home/mininet/pox/ext/swbasico2.py", line 46, in _install
>>     for i in range(len(out_port)):
>> TypeError: object of type 'int' has no len()
>>  
>>
>> Please, could you help me with that?
>>
>>
>>
>>
>
> In the second example, you're passing out_port = 2.  When line 46  
> does len(out_port), this is len(2), which doesn't make any sense.  
>  You could fix this function so that it does the right thing  
> depending on whether it's passed an integer or a sequence, but you  
> can also just pass it a sequence.  Lucas almost had it right, except  
> that (2) is not a tuple -- it's just a subexpression.  Try this:
> self._install(event.connection.dpid,1,(2,)))
> or
> self._install(event.connection.dpid,1,[2]))
>
> /Thank you very much, I had used  
> self._install(event.connection.dpid,1,(2,)) and worked well./
>
>
>  
> -- Murphy
>
>
>
>    --
>    Esta mensagem foi verificada pelo sistema de antivírus e
>    acredita-se estar livre de perigo.
>

-- 
Esta mensagem foi verificada pelo sistema de antivírus e
 acredita-se estar livre de perigo.

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