Thanks you i will try it out. The only what I need to do is sending the
openflow message to a live datapath ID. But if we apply packet in message
scenario, switch will need to send a lot of packet in message in oder to
reroute reactively but RYU,shows memory error when running 2 hours. If we
can apply the flow rules without packet in message when some node is failed
that problem can be resolved.

On Fri, Oct 19, 2018, 3:12 PM IWAMOTO Toshihiro <[email protected]>
wrote:

> On Thu, 18 Oct 2018 16:41:57 +0900,
> Soe Ye Htet wrote:
> >
> > [1  <text/plain; UTF-8 (7bit)>]
> > Dear,
> >
> > The problem is I dont know how to send flowmod message to raspi2 when
> > raspi1 is down to relay the data from raspi3 to gateway1. As far as i
> know
> > there is two ways to assign flow table to switch ID. By the switch
> feature
> > message to assign flow table proactively or packet in message to assign
> > flow table reactively. The problem is that i do not want to apply packet
> in
> > message for rerouting because packet in measage can consume a lot of
> memory
> > in ryu controller. What I am trying to do,is, monitoring node status all
> > the time, and send flowmod message to raspi2 to,relay data from raspi3
> only
> > when raspi1 is down. How to assign the flow table in state change handler
> > function.
>
> In order to send OpenFlow messages, you'll only need Datapath of the
> other alive side of raspis.
>
> Something like ryu.app.simple_monitor_13 would work, I guess.
>
> --
> IWAMOTO Toshihiro
>
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