Hi, You do not need buffer_id but what you really need is the Datapath ID ( or pi.datapath_id as you will see it the switch example ) of each switch to correctly identify all the switches currently connected to the Controller. You should look into Datapath join event (the event caused by a switch joining the controller) to get the datapath ids required.
Regards, Khan 2011/10/5 Sergio Jiménez Feijóo <sergio.j...@gmail.com> > Hi, > > I'm developping an Openflow app which calculates the optimal path between > two Openflow switches. Once my app knows the path to use it needs to set up > a flowmod in all the switches involved in the path. The code of my app is > triggered everytime a Packet_in_event happens. > > I've been taking a look at the learning switch example code in coreapps and > seems that in order to create a fowmod you need acces to the buffer of the > switch which triggered the event. > > If you are setting a flowmod in the switch which triggered the event that's > not a problem because you can get the buffer from the Packet_in_event. > > const Packet_in_event& pi = assert_cast<const Packet_in_event&>(e); > uint32_t buffer_id = pi.buffer_id; > > ofm->buffer_id = htonl(buffer_id); > > But my problem is that I also need to set flowmods in the other switches > which haven't received a Packet_in_event (therefore I can't acces their > buffers). > > The acces to the buffer is really necesary to set up a flowmod in a switch? > Is there any way to do this? > > Thank you. > ______________________________**_________________ > nox-dev mailing list > nox-dev@noxrepo.org > http://noxrepo.org/mailman/**listinfo/nox-dev<http://noxrepo.org/mailman/listinfo/nox-dev> >
_______________________________________________ nox-dev mailing list nox-dev@noxrepo.org http://noxrepo.org/mailman/listinfo/nox-dev
