<div dir="ltr"><div dir="ltr"><div>Hi Ben,</div><div><br></div><div>My reply inlined.<br></div></div><br><div class="gmail_quote">>Or are you saying that, when <br></div><div class="gmail_quote">>you take the link down, you get an "up" and then a "down" message</div><div class="gmail_quote">>quickly in succession?<br><div>YES. I see when i bring the link down, i get UP and then DOWN message.</div><div></div><div><br></div><div>Thanks</div><div>Suresh.<br></div><div></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
On Mon, Jul 22, 2019 at 09:34:46PM +0530, S Suresh wrote:<br>
> Hi Ben,<br>
> <br>
> My test environment is,<br>
> Mininet, RYU SDN Controller.<br>
> <br>
> 2) Mininet shell provides the "link" command , which brings downs the link<br>
> between two switches(port interfaces).<br>
> mininet>link s1 s2 down<br>
> which brings the s1 to s2 link down (s1 port connected to s2)<br>
> <br>
> 3) Captured the open flow messages in Wire shark, as well as in RYU SDN<br>
> Controller.<br>
> <br>
> Thanks<br>
> Suresh<br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> On Mon, Jul 22, 2019 at 9:15 PM Ben Pfaff <<a href="mailto:blp@ovn.org" target="_blank">blp@ovn.org</a>> wrote:<br>
> <br>
> > On Mon, Jul 22, 2019 at 10:02:33AM +0530, S Suresh wrote:<br>
> > > I am testing the Openflow Port Status message.<br>
> > ><br>
> > > My observations are as follows,<br>
> > > 1)<br>
> > > When the port(switch s1, port 1) is down.<br>
> > > (Note: i was expecting only one PORT Status message with PORT DOWN set)<br>
> > > But I have received two OpenFlow Port Status messages.<br>
> > > The first message shows PORT UP (for S1 , port 1).<br>
> > > Immediately , the second message show PORT DOWN (for S1 , port1).<br>
> > ><br>
> > > Is it correct behavior?<br>
> ><br>
> > It's surprising behavior.<br>
> ><br>
> > Can you explain how to reproduce it?<br>
> ><br>
</blockquote></div></div>