On 8/29/13 10:36 AM, Sudeep Singh wrote:
I guess, so far standard MSTP support is not available with any controller and interop with traditional switch is not yet done.
That's correct; OpenDaylight should probably work on that so that OF fabrics can interop safely with regular Ethernet.
I think, standard MSTP can be integrated with OpenFlow controller with packet-in and packet-out as mentioned by Wes Felter with some modification in flood mechanism (per Vlan port state lookup before flood) as explained in my first post but it will not get OF spec support as basic 802.1D STP flags and state given in OF spec will not help.
Yes, there are two ways to handle STP: hybrid or pure OF. In hybrid mode the switch runs STP and the controller doesn't need to do much other than read the port state. I don't know if any switches implement hybrid mode. In pure OF mode the controller cannot use OFPP_FLOOD; it needs to set up groups to perform flooding (which means you need to use OF 1.x not 1.0). Handling the interaction of VLANs and ports is somewhat complex but the ONF FAWG WG is working on this.
-- Wes Felter IBM Research - Austin _______________________________________________ openflow-discuss mailing list openflow-discuss@lists.stanford.edu https://mailman.stanford.edu/mailman/listinfo/openflow-discuss
