It looks like maybe your POX isn't running the latest version of the carp branch. Can you switch to carp if necessary and pull the latest version and try again? I've pushed a change to openflow.discovery.
-- Murphy On Oct 1, 2013, at 3:13 PM, Maciej Korczyński <[email protected]> wrote: > 2013/10/1 Murphy McCauley <[email protected]> > I've CCed this to pox-dev, which is the right list for POX related messages. > > > Thank you very much. > > But the first thing I'd try is: > > ./pox.py forwarding.l2_pairs openflow.discovery --eat-early-packets > openflow.spanning_tree --no-flood --hold-down > > > I tried it straight away but unfortunately it gives the same results. > > Thanks, > Maciej > > > > -- Murphy > > On Oct 1, 2013, at 2:32 PM, Maciej Korczyński <[email protected]> > wrote: > >> Hello, >> I'm trying to run a spanning tree in POX (./pox.py forwarding.l2_learning >> openflow.discovery openflow.spanning_tree --no-flood --hold-down). I've >> built a mininet network composed of 20 switches in a full mesh with multiple >> hosts attached to each of switches and I get the following error (also see >> the attachment): >> ERROR:openflow.of_01:[00-00-00-00-00-14 11] OpenFlow Error: >> [00-00-00-00-00-14 11] Error: header: >> [00-00-00-00-00-14 11] Error: version: 1 >> [00-00-00-00-00-14 11] Error: type: 1 (OFPT_ERROR) >> [00-00-00-00-00-14 11] Error: length: 36 >> [00-00-00-00-00-14 11] Error: xid: 6220717 >> [00-00-00-00-00-14 11] Error: type: OFPET_BAD_REQUEST (1) >> [00-00-00-00-00-14 11] Error: code: OFPBRC_BUFFER_UNKNOWN (8) >> [00-00-00-00-00-14 11] Error: datalen: 24 >> [00-00-00-00-00-14 11] Error: 0000: 01 0d 00 18 00 5e eb ad 00 01 88 7f 00 >> 09 00 08 .....^.......... >> [00-00-00-00-00-14 11] Error: 0010: 00 00 00 08 ff fb 00 00 >> ........ >> ERROR:openflow.of_01:[00-00-00-00-00-14 11] OpenFlow Error: >> [00-00-00-00-00-14 11] Error: header: >> [00-00-00-00-00-14 11] Error: version: 1 >> [00-00-00-00-00-14 11] Error: type: 1 (OFPT_ERROR) >> [00-00-00-00-00-14 11] Error: length: 36 >> [00-00-00-00-00-14 11] Error: xid: 6220718 >> [00-00-00-00-00-14 11] Error: type: OFPET_BAD_REQUEST (1) >> [00-00-00-00-00-14 11] Error: code: OFPBRC_BUFFER_UNKNOWN (8) >> [00-00-00-00-00-14 11] Error: datalen: 24 >> [00-00-00-00-00-14 11] Error: 0000: 01 0d 00 18 00 5e eb ae 00 01 88 80 00 >> 09 00 08 .....^.......... >> [00-00-00-00-00-14 11] Error: 0010: 00 00 00 08 ff fb 00 00 >> ........ >> ^CDEBUG:openflow.spanning_tree:Spanning tree updated >> >> I believe it might be a problem with an algorithm because when construct >> networks composed of e.g. 7 switches in a full mesh there are no errors and >> the communication works fine. Also, if I construct a network with loops but >> less links (e.g. 20 switches, not in a full mesh topology but every switch >> is connected to 50% other switches) then it works better. >> >> >> Could you please have a look and tell me if you had similar problems and >> some ideas on how to fix that? >> Also, if I'm right and it's an algorithmic problem then do we have any other >> alternative solution to openflow.spanning_tree or we are limited in our >> simulations to tree or star network topologies? >> >> Thanks, >> Maciek >> <log.png> > >
