If they're in a ring and you therefore have a loop... if you're not careful, you'll get looping packets, which can certainly overwhelm the network and switches, exhaust buffers, and starve the control channel if it's on the same network.
-- Murphy On Oct 21, 2014, at 5:15 PM, Brian Krisler <bkris...@bbn.com> wrote: > I started to remove switches and discovered one was causing issues. I have > not yet investigated why. > > What I am trying to accomplish is a proof of concept with 4 switches in a > ring topology. Two of the four switches are connected to different subnets. > So 192.168.0.x is connected to switch1 and 192.168.1.x is connected to > switch3. > > All switches are controlled by a single controller, and the goal is to be > able to dynamically reroute traffic between the subnets within the ring based > on higher-level rules passed into the controller. > > So in normal traffic flows from switch1 to switch3, a rule can tell the > controller to route switch1 to switch2 to switch4, for example. > > I basically have it working, I am now trying to get statistics setup to > report on existing traffic flows. > > Brian > > > >> On Oct 21, 2014, at 5:40 PM, Murphy McCauley <murphy.mccau...@gmail.com> >> wrote: >> >> Maybe you could start off by describing your setup a bit. What is your >> network like, what POX components are you running, what are you trying to >> accomplish, etc.? >> >> -- Murphy >> >>> On Oct 21, 2014, at 11:16 AM, Brian Krisler <bkris...@bbn.com> wrote: >>> >>> Hi, >>> >>> In my controller, I keep getting the error messages below, >>> or I get a stream of “DEBUG:openflow.of_01:deferred sender is sending!” >>> messages. >>> >>> I have now reduced my handle_PacketIn method to be: >>> >>> def handle_PacketIn(self, event): >>> packet = event.parsed >>> msg = of.ofp_packet_out(data = event.ofp) >>> msg.actions.append(of.ofp_action_output(port = of.OFPP_NORMAL)) >>> event.connection.send(msg) >>> return None >>> >>> And I still get this issues. How do I figure out the cause? >>> >>> Thanks >>> >>> Brian >>> >>> >>> >>> ERROR:openflow.of_01:[08-00-27-21-24-cc 6] OpenFlow Error: >>> [08-00-27-21-24-cc 6] Error: header: >>> [08-00-27-21-24-cc 6] Error: version: 1 >>> [08-00-27-21-24-cc 6] Error: type: 1 (OFPT_ERROR) >>> [08-00-27-21-24-cc 6] Error: length: 36 >>> [08-00-27-21-24-cc 6] Error: xid: 53974 >>> [08-00-27-21-24-cc 6] Error: type: OFPET_BAD_REQUEST (1) >>> [08-00-27-21-24-cc 6] Error: code: OFPBRC_BUFFER_UNKNOWN (8) >>> [08-00-27-21-24-cc 6] Error: datalen: 24 >>> [08-00-27-21-24-cc 6] Error: 0000: 01 0d 00 18 00 00 d2 d6 00 00 05 2a 00 >>> 01 00 08 |...........*....| >>> [08-00-27-21-24-cc 6] Error: 0010: 00 00 00 08 ff fa 00 00 >>> |........ | >>> ERROR:openflow.of_01:[08-00-27-21-24-cc 6] OpenFlow Error: >>> [08-00-27-21-24-cc 6] Error: header: >>> [08-00-27-21-24-cc 6] Error: version: 1 >>> [08-00-27-21-24-cc 6] Error: type: 1 (OFPT_ERROR) >>> [08-00-27-21-24-cc 6] Error: length: 36 >>> [08-00-27-21-24-cc 6] Error: xid: 53975 >>> [08-00-27-21-24-cc 6] Error: type: OFPET_BAD_REQUEST (1) >>> [08-00-27-21-24-cc 6] Error: code: OFPBRC_BUFFER_UNKNOWN (8) >>> [08-00-27-21-24-cc 6] Error: datalen: 24 >>> [08-00-27-21-24-cc 6] Error: 0000: 01 0d 00 18 00 00 d2 d7 00 00 05 2b 00 >>> 03 00 08 |...........+....| >>> [08-00-27-21-24-cc 6] Error: 0010: 00 00 00 08 ff fa 00 00 >>> |........ | >>> ERROR:openflow.of_01:[08-00-27-21-24-cc 6] OpenFlow Error: >>> [08-00-27-21-24-cc 6] Error: header: >>> [08-00-27-21-24-cc 6] Error: version: 1 >>> [08-00-27-21-24-cc 6] Error: type: 1 (OFPT_ERROR) >>> [08-00-27-21-24-cc 6] Error: length: 36 >>> [08-00-27-21-24-cc 6] Error: xid: 53976 >>> [08-00-27-21-24-cc 6] Error: type: OFPET_BAD_REQUEST (1) >>> [08-00-27-21-24-cc 6] Error: code: OFPBRC_BUFFER_UNKNOWN (8) >>> [08-00-27-21-24-cc 6] Error: datalen: 24 >>> [08-00-27-21-24-cc 6] Error: 0000: 01 0d 00 18 00 00 d2 d8 00 00 05 2c 00 >>> 01 00 08 |...........,....| >>> [08-00-27-21-24-cc 6] Error: 0010: 00 00 00 08 ff fa 00 00 >>> |........ | >>
