Hi Julian,

Thank you for reporting it!

I agree that gui_topology.py displays nothing in some cases...
But, on my environment, I could view my topology with gui_topology.py
+ simple_switch_13.py as the attached screenshot.

e.g.)
$ ryu-manager --observe-links ryu/app/gui_topology/gui_topology.py 
ryu/app/simple_switch_13.py
...

Thanks,
Iwase


On 2017年02月25日 01:36, Julian D'Orsaneo wrote:
> Good Morning,
> 
> I have been playing around with ryu a bit, and have run into some issues with 
> the topology viewer.  It works greats when I run the gui_topology app on its 
> own, but when I try to run it with simple_switch.py or any other app I 
> receive a 404 error for the GET attempt.  This results in nothing being 
> displayed in the Ryu Topology Viewer box.  I have seen posts about this in 
> the archives, but I have not seen a direct answer yet.  Any assistance is 
> greatly appreciated. 
> 
> Julian  
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