I'm a little confused with your question. Do you mean the mechanism such as auto discovery of the new openflow switch ? I'm from a openflow switch provider, and the switch has to set the controller's ip address and then communicate with the server via tcp or other protocol in our design.
Thanks, Liang On Wed, Aug 15, 2012 at 6:02 PM, Daniel Philip <dany1...@gmail.com> wrote: > Thank you all for making this clear. > > As part of a research project, I am trying to do "something" with mobility > within an openflow network. That said, our aim is to bring-in an openflow > switch into an already exiting network topology before any host is attached > to this openflow switch. > > That was why I was interested to know what happens and how connections are > established initially when an openflow switch is detected by a controller. > > Thanks again. > > On Wed, Aug 15, 2012 at 4:05 AM, Shouren Yang <yangshou...@gmail.com> wrote: >> >> Hi, Daniel, >> >> According to OpenFlow specification v1.0.0, the switch must eb able to >> establish the communication at a user-configurable(but otherwise fixed) IP >> address, using a user-specified port. >> >> As far as i know, you should set the controller's IP address and port when >> starting OpenFlow Switch. Then the Controller and the Switch will establish >> a TCP or TLS connection and OFPT_HELLO will be sent to each side of the >> connection. So the controller knows there is a new Switch added into the >> network. >> >> The controller will let the switch send LLDP packet, and if one port is >> linked to another switch, the LLDP packet will be send to controller by that >> switch and controller knows the topology. For details you may look into the >> discovery component. >> >> On Wed, Aug 15, 2012 at 4:55 AM, Daniel Philip <dany1...@gmail.com> wrote: >>> >>> Hi all, >>> >>> By definition: When an OpenFlow switch receives a packet for the first >>> time, for which it has no matching flow entries, it sends this packet to the >>> controller. The controller then makes a decision on how to handle this >>> packet. >>> >>> But, can someone please clarify how does an OpenFlow controller (say NOX) >>> detect an OpenFlow switch (before it sends its first packet to the >>> controller) ? >>> >>> Precisely, let's say there is a network that comprises of 2 openflow >>> switches that are attached to NOX. Now, to this exisitng network topology, >>> when a third switch moves into it, what happens ( from the controller side >>> and/or switch side) unless this third switch sends its first packet to the >>> controller? >>> >>> Thanks in advance, >>> Daniel >>> >>> >> >> >> >> -- >> Shouren Yang 杨守仁 >> Kimi >> >> School of Information and Communication Engineering >> Beijing University of Posts and Telecommunications >> 北京邮电大学 信息与通信工程学院 >> >> Mobile Phone: >> (86) 1861-078-2697 Beijing >> (86) 1506-781-8982 WenZhou >> >> Gmail: yangshou...@gmail.com >> Hotmail: kimi_...@hotmail.com; kimi_...@mscampus.cn >> >> Personal Website: kimi4ysr.me >> > > > _______________________________________________ > openflow-discuss mailing list > openflow-discuss@lists.stanford.edu > https://mailman.stanford.edu/mailman/listinfo/openflow-discuss > _______________________________________________ openflow-discuss mailing list openflow-discuss@lists.stanford.edu https://mailman.stanford.edu/mailman/listinfo/openflow-discuss
