Hi Murphy, Thanks alot for the reply.. I read the POX manual and as I understood, once the controller receive a packet from a switch, controller can use the connection object of that switch and send a flow-mod message to that switch.. But my requirement is, I want to send a flow-mod message to a specific switch, where I know only the IP address of the switch..
For an example h1 ---- s1 ---- s2 ---- s3 ---- h2 For this topology, I want to install following flow-rules in s1,s2 and s3.. I have the IP addresses of the switches.. In s1 : If packet comes from h1, forward it through port1 In s2 : If packet comes from h1, forward it through port2 In s3 : If packet comes from h1, forward it through port3 Highly appreciate your comments on this.. On Thu, Mar 20, 2014 at 8:21 AM, Murphy McCauley <murphy.mccau...@gmail.com>wrote: > There's nowhere in OpenFlow's flow-mod structure to specify the datapath. > It's just which datapath you send it to. In POX, this means which > Connection object you use to send the message. There's information > relevant to your question in the "OpenFlow in POX" section of the manual. > In particular, there's a "Connection Objects" subsection at the beginning > and then a "Communicating with a Datapath" subsection later (these should > probably be merged). > > As far as installing rules early, the best you can do is to set them as > soon as the switch connects to the controller -- in a ConnectionUp handler. > There's an example of this I think in forwarding.hub. > > -- Murphy > > On Mar 19, 2014, at 11:58 PM, Windhya Rankothge <windys...@gmail.com> > wrote: > > > Hi all, > > > > I want to send OFPFlowMod message to a specific switch from the > controller.. I have read about OFPFlowMod message structure and saw that we > can specify the datapath.. But I am not sure how I can use this datapath to > specify the switch I want to send the message.. Also I want to install > rules on this specific switch before data packet transmission happen in the > network.. > > > > Highly appreciate your comments on this.. > > > > Best Regards, > > > > Windhya Rankothge, > > Universitat Pompeu Fabra, > > Barcelona. > > -- Best Regards, Windhya Rankothge, Universitat Pompeu Fabra, Barcelona.
