Re: [Ryu-devel] Assigning Flow Rules to the specific Datapath ID during Failure of node

[IWAMOTO T. <iw...@va...>]

On Mon, 22 Oct 2018 14:08:47 +0900,
Soe Ye Htet wrote:
> 
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> Dear IWAMOTO,
> 
> Exactly what i want to do. Monitoring aliveness of raspis and sending flow
> to raspi2 when necessary. How can I send flowmod message to raspi2?
> Normally I define switch feature handler and packet in handler to send flow
> mod. Is there another way to send flowmod message when necessary by not
> using packet-in message. Switch feature handler can only allow to send flow
> mod message to the switch when switch is connected to the controller. In my

Why cannot you do that?
I think Datapaths can be stored in a global variable and can be used
from those handlers.

> case, I want to send flowmod message to the switch whenever i want. I use
> to get this feature by using packet-in message in order to change routing
> scenario. But the problem is controller is stopped due to memory error as
> there are a lot of packet -in message. Is there anyway to send flowmod when
> i want to send without packet-in message please let me see some of the
> example if you have. I am so sorry for my simple question.
> 
> Best regards,
> Soe Ye Htet
> Future Internet and Wireless Research Group
> Chulalongkorn Thailand
> 
> On Thu, Oct 18, 2018 at 1:56 PM IWAMOTO Toshihiro <iw...@va...>
> wrote:
> 
> > On Fri, 12 Oct 2018 21:44:53 +0900,
> > Soe Ye Htet wrote:
> > > I am developing some rerouting scenario when there is some node failure.
> > I
> > > have attached my testing topology testbed. RYU controller is at the
> > gateway
> > > 1 and raspi 1 and raspi 2 are directly connected to gateway 1. raspi 3 is
> > > connected to raspi 2 and raspi 1. The primary route for raspi3 to
> > gateway 1
> > > is raspi 3 - raspi 1 - gateway 1. what i am trying to do is when raspi 1
> > is
> > > down, RYU controller want to assign the flow rules to raspi 2 to relay
> > the
> > > data from raspi 3 to gateway 1. So that raspi 3 can be connected to the
> >
> > I'm not sure this objective is achievable sorely with flows, but let's
> > go on.
> >
> > > gateway 1 through the route of raspi 3 - raspi 2 - gateway 1. But I
> > cannot
> > > assign the flow rules to raspi 2 when raspi 1 is failed. Is there any way
> > > to assign the flow rules to other node when the node is failure. Any
> > > suggestions are warmly welcomed.
> >
> > What errors do you get?
> > I assume the openflow controller on gateway1 controls raspi 1 and 2.
> > Isn't it a matter of just monitoring aliveness of raspis and sending
> > flowmods to raspi 2 when necessary?
> >
> > --
> > IWAMOTO Toshihiro
> >
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