If your topology is simple/static and depending on how your application works,
you really may not need anything particularly complicated to solve the problem
(e.g., not necessarily a full spanning tree). For example, it's often the case
that only floods are problematic and you can just rethink your flooding and/or
disable flooding on some ports and be done.
You also may be able to make use of the openflow.spanning_tree component,
though it's may well be overkill.
-- Murphy
On Oct 21, 2014, at 5:22 PM, Brian Krisler bkris...@bbn.com wrote:
Good point. I was thinking I had a check for that. But your point is dead on,
as soon as I broke the loop, all was fine.
Guess I need a spanning tree.
Thanks.
Brian
On Oct 21, 2014, at 8:18 PM, Murphy McCauley murphy.mccau...@gmail.com
wrote:
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: : 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: : 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: : 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
||
