Harry, the problem is that the datapath flows do expire after 5 seconds of inactivity. You can change this in the pyswitch flow install timeout options. You can also check that if you keep sending ping packets between the hosts, the flow entries do not expire independent from the controller connectivity (unless you opt to change the default behaviour of switches after loosing the connection to the controller).
-Christian On Thu, Mar 24, 2011 at 11:28, Harry <[email protected]> wrote: > Hi all, > Anyone could clear me this issue: > I'm playing with the *pyswitch* component built on NOX. I start a single > switch (ovsk switch) network in mininet with 3 hosts (h2,h3,h4), then start > NOX controller with pyswitch. > I ping from h2 to h3, log messages show that the controller successfully > installed datapath flow for the first 3 packets (ARP & ICMP) between h2 & > h3. > Then I exit the controller, of course, I still ping from h2 to h3 (because > datapath flows have been installed on the switch). > *But when I restart the controller and do the ping h2->h3 again, why does > the controller reinstall the datapath flows on the switch? The datapath > flows on the switch seem to be cleared when I restart the controller. * > > Thank you very much! > > _______________________________________________ > nox-dev mailing list > [email protected] > http://noxrepo.org/mailman/listinfo/nox-dev > > -- Christian
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