I guess I am a little confused about the concept of datapath. Do you have any documentation that explains this?
I guess what I really need to know is that whether having 2 bridges with a single vswitchd daemon will behave the same as having 2 separate bridges associated with separate vswitchd processes. Is there any difference between the 2 at all in final behavior. The first one will also simulate complete independence between the bridges right? On Fri, Apr 12, 2013 at 3:09 PM, Ben Pfaff <[email protected]> wrote: > You can use multiple bridges with 1.10 or later, including master, but > those bridges use a single kernel datapath. > > Why do you care whether you use multiple kernel datapaths? > > On Fri, Apr 12, 2013 at 02:55:30PM -0700, Aishwarya wrote: > > I am using the master branch which is OVS 1.10 or higher. So does that > mean > > I will not be able to test multiple datapaths with a single ovs-vswitchd > > daemon with 1.10 and higher? You answered yes to #2 above? Is this true > > with 1.10 too? > > > > Thanks. > > > > > > On Fri, Apr 12, 2013 at 2:43 PM, Ben Pfaff <[email protected]> wrote: > > > > > On Fri, Apr 12, 2013 at 02:27:09PM -0700, Aishwarya wrote: > > > > 1) Running 2 OVS user space daemons on the same machine, and > creating a > > > > bridge per OVS process. > > > > > > > > 2) Running a single OVS and creating 2 different bridges with the > same > > > OVS > > > > process. > > > > > > > > Couple of questions: > > > > 1. Is (1) even supported? > > > > > > It won't work, out of the box, if you use the OVS kernel module. You > > > might be able to get it to work with some effort, especially if you > > > use the userspace datapath only. > > > > > > > 2. My use case is that I basically want to be able to test with > multiple > > > > datapaths on the same machine. With my experimentation, I feel (2) > should > > > > satisfy this. Is that true? > > > > > > Yes. > > > > > > > 3. Does a single bridge correspond to a single datapath? If not, > what is > > > > the real difference between the concept of a bridge and datapath? > > > > > > A bridge is an Ethernet or OpenFlow concept. A datapath is an > > > implementation detail. Before OVS 1.10 there was a one-to-one > > > relationship between bridges and datapaths; in OVS 1.10 and later > > > there is only one datapath even if there are many bridges. > > > >
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