Hi Xiao, Thanks for your help. It's just my curious about a special case where a OF switch is under control of 2 or more controllers.
Best regards, Minh. 2015-09-16 11:44 GMT+09:00 Xiao Liang (xiaolia) <[email protected]>: > Hi Minh, > > > > Controller could query existing flows before adding. I’m not clear why you > need to do this. Ovs-ofctl has no impact as long as you don’t use it. You > can remove the mgmt socket (/var/run/openvswitch/<bridge>.mgmt) if you > really want. > > > > Thanks, > > Xiao > > > > *From:* Minh Nghiem Gia [mailto:[email protected]] > *Sent:* Tuesday, September 15, 2015 22:04 > *To:* Xiao Liang (xiaolia) > *Cc:* [email protected] > *Subject:* Re: [ovs-discuss] way to speak with OpenFlow module > > > > Hi Xiao, > > > > Thank you for your quick response. That means there are several ways to > insert OF flows! Then, if I insert OF rules by using ovs-ofctl and by a > controller, is there any way to ensure installed rules are not overlap or > interfere with the others? Or is there any way to only allow one way to > communicate with the switch? > > > > Best regards, > > Minh. > > > > 2015-09-15 18:43 GMT+09:00 Xiao Liang (xiaolia) <[email protected]>: > > Hi Minh, > > > > As far as I know, most controllers will include OpenFlow protocol > implementation. They communicate with switches by OpenFlow message. In this > way, ovs-ofctl makes no difference, it sends / receives messages via > sockets (unix, tcp, etc.). Some controller might also have OVSDB > southbound, which manipulates OVS bridges as ovs-vsctl. > > Some applications (like Openstack, IIRC) might have an agent running on > the host to call OVS utils. > > > > Thanks, > > Xiao > > > > *From:* discuss [mailto:[email protected]] *On Behalf Of *Minh > Nghiem Gia > *Sent:* Tuesday, September 15, 2015 16:43 > *To:* [email protected] > *Subject:* [ovs-discuss] way to speak with OpenFlow module > > > > Hello, > > > > It is easy to push OpenFlow rules to OVS by using the OVS utility such > as ovs-ofctl. Thanks all OVS developers! > > However, I now want to try that function with a SDN controller and I > wonder that does the SDN controller (i.e., pox, nox or floodlight) will > call ovs-ofctl to install OF flows or they implement their own way (which > probably works in a similar way to ovs-ofctl) to complete that tasks? > > Anyone please help on my dummy question. > > > > Thanks a lot, > > Minh. > > >
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