I think Eder has it all right.

The message in question is nx_role_request, and it is available in the POX carp 
branch.

Using Nicira / OVS extensions in POX is currently not documented very well, but 
there is an entry for it in the manual and a component or two which use them 
(e.g., forwarding.l2_nx).  Best bet at the moment is reading OVS documentation, 
the OVS source files (especially nicira-ext.h, which you can find on Google 
easily), and pox.openflow.nicira (where all the POX code for it lives).

Luckily, nx_role_request should be pretty easy to use.

-- Murphy

On Sep 19, 2013, at 1:13 PM, Windhya Rankothge <[email protected]> wrote:

> Thanks alot for the information.. I will look into Nicira extension..
> 
> 
> On Thu, Sep 19, 2013 at 9:52 PM, Eder Leão Fernandes 
> <[email protected]> wrote:
> Hi, 
> 
> POX does not support OpenFlow version beyond 1.0. I think it has the Nicira 
> extension that (I believe), originated the feature on the newest 
> specifications. It should work on switches that support Nicira extensions, 
> most notably Open vSwitch.
> 
> Regards,
> Eder.
> 
> 
> On 19 September 2013 15:37, Windhya Rankothge <[email protected]> wrote:
> Hi all,
> 
> I want to know whether POX supports Role Request Messages specifications 
> given in openflow 1.4.0.. 
> Please let me know where I can find the information..
> 
> 
> On Thu, Sep 19, 2013 at 10:59 AM, Windhya Rankothge <[email protected]> 
> wrote:
> Hi all,
> 
> In the openflow specifications I saw that we can connect multiple controlelrs 
> to a openflow switch and configure one controlelr as the master controller 
> and others as slave controllers..
> 
> And I read that controller has to send a role change request to do this..
> 
> But I was not able to find any example on how to do this..
> 
> Highly appreciate any help on this..
> 
> 
> Best Regards,
>  
> Windhya Rankothge....
> 
> 
> 
> -- 
> Best Regards,
>  
> Windhya Rankothge..... (WINDY)
> 
> _______________________________________________
> openflow-discuss mailing list
> [email protected]
> https://mailman.stanford.edu/mailman/listinfo/openflow-discuss
> 
> 
> 
> 
> -- 
> Eder Leão Fernandes 
> 
> Bacharelado em Ciências de Computação
> Instituto de Ciências Matemáticas e de Computação
> Universidade de São Paulo
> 
> 
> 
> -- 
> Best Regards,
>  
> Windhya Rankothge..... (WINDY)

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