I've CCed this to pox-dev, which is the right list for POX related messages.
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 -- 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>
