Hi, Can the message be understood as: For a "pure" openflow switch (i.e., not hybrid), one still has to implement a routing protocol (using openflow) on the switch in order for the controller to perform routing (e.g., when handling the 1st packet of a flow). W/o routing support at individual switches, the controller can't find a path from source to destination.
Thanks, Daniel On Sun, May 27, 2012 at 10:25 PM, Chris Small <chsm...@grnoc.iu.edu> wrote: > Look at RouteFlow (https://sites.google.com/site/routeflow/) for an > example of a project that uses OpenFlow to implement IP routing. > > Google ( > http://www.nanog.org/meetings/nanog50/abstracts.php?pt=MTYzNSZuYW5vZzUw&nm=nanog50) > and > Ericsson (http://www.openflow.org/wk/index.php/OpenFlowMPLS) have > projects that implement MPLS in OpenFlow. The OpenFlow 1.0 spec doesn't > have support for MPLS so this was done with some workarounds (extensions in > Erickson's case, Google's implemented have push and pop functions as > virtual ports) > > With Openflow you have the capability of implementing many of the > forwarding and counting functions in OpenFlow. Some switches also support > hybrid mode where you have both the native capabilities (L3 routing, L2 > switching, possibly even MPLS) of the device plus a OpenFlow on selected > ports (or flows with the NORMAL action). The advantage with implementing > functions n OpenFlow is that you have the flexibility to alter the > software/protocols and combine the function with other applications. > > Chris Small > InCNTRE > Indiana University > chsm...@indiana.edu > > > > > On May 27, 2012, at 7:29 AM, sitara...@nmsworks.co.in wrote: > > Hi Dave, > Thanks for the response. > Arent we then talking of only switches then, i.e are these Switches L3 > switches, and if so, is it true that the, say, IP routing can(is) also > be brought under centralized control. Have such product being demoed in > industry shows anywhere that brings say IP Routing or perhaps more > likely, MPLS Label Switching under centrailized SDN control? > Thanks again for offering your insights. > Sitaraman > > There are some specialized switches, such as the ones Google described at > > the recent ONS conference, which have only a boot loader and an OpenFlow > > agent for firmware. Most commercial switches have full switch firmware in > > addition to an OpenFlow agent, and many of them operate in Hybrid Mode, so > > the answer is "yes", all the usual upper layers are present. > > > Regards, > > > Dave > > > David B. Nelson > > Director of Technology > > Elbrys Networks, Inc. > > www.elbrys.com > > +1.603.570.2636 > > > -- > > This message has been scanned for viruses and > > dangerous content by MailScanner, and is > > believed to be clean. > > > > > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > _______________________________________________ > 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 > >
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