Hello Iwase,

Thank you for your reply. I am already using this for port status, but is there 
a way to extract the OFPPS_LINK_DOWN message, or to somehow map between the 
port status messages and link status messages, like if the message is 
OFPPR_DELETE it is the same as OFPPS_LINK_DOWN? Or to be more precise, how to 
use OFPPort class to extract information about link status?

Best regards,

Marko

-----Original Message-----
From: Iwase Yusuke [mailto:iwase.yusu...@gmail.com] 
Sent: Friday, January 26, 2018 1:28 AM
To: marko.erem...@amres.ac.rs
Cc: ryu-devel@lists.sourceforge.net
Subject: Re: [Ryu-devel] Link status

Hi Marko,

How about the following?
http://ryu.readthedocs.io/en/latest/ofproto_v1_3_ref.html#port-status-message

You can use;
     @set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER) to detect link 
state changes.

Thanks,
Iwase

On 2018年01月26日 05:48, Marko Eremija wrote:
> Hello,
> 
> I am trying to write a Ryu app that will be able to get link status. I 
> would like to find a way to notify the controller about the reason why 
> link is down (e.g. by using OFPPS_LINK_DOWN message), and trigger 
> actions if that is the case. If I understand correctly, I cannot use 
> the Port class from ofproto_v1_3_parser.py to get the link status, like this 
> e.g.:
> 
> @set_ev_cls(ofp_event.EventOFPPSLinkDown, [MAIN_DISPATCHER])
> 
> If someone would just tell me where to find this information, that 
> would be much appreciated.
> 
> Best regards,
> 
> Marko
> 
> 
> 
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