Well it does make some sense and should be able to work but when I try it in
my application like shown below, I get the following errors
def handle_flow_stats_in(self, dpid, flows, more, xid):
print "Flow stats in from datapath", longlong_to_octstr(dpid)[6:]
temp = 0
for item in flows:
val = item['byte_count']
z = int(val)
if z > temp:
temp = z
print "highest", temp
if temp > 1000:
inport = flows[0]['match']['in_port']
flow = flows[0]['match']
print inport
#print flow
actions = []
self.install_datapath_flow(dpid, flow, CACHE_TIMEOUT,
DROP_TIMEOUT,
actions,
openflow.OFP_DEFAULT_PRIORITY,
inport)
First error:
00006|openflow-event|ERR:received Openflow error packet from
dpid=000000000001: type=1, code=8, 128 bytes of data
When I change the command for installing a flow to contain the bufid and
buf:
self.install_datapath_flow(dpid, flow, CACHE_TIMEOUT, DROP_TIMEOUT,
actions, bufid,
openflow.OFP_DEFAULT_PRIORITY,
inport, buf)
I get this error:
00006|pyrt|ERR:unable to invoke a Python event handler:
Traceback (most recent call last):
File "./nox/lib/util.py", line 192, in f
ret = f.cb(event.datapath_id, event.flows, event.more, event.xid)
File "./nox/netapps/routing/samplerouting.py", line 181, in
handle_flow_stats_in
actions, bufid, openflow.OFP_DEFAULT_PRIORITY,
NameError: global name 'bufid' is not defined
Where could the problem be?
Thanks,
Chris
On Sat, Sep 3, 2011 at 1:47 AM, Murphy McCauley <jam...@nau.edu> wrote:
> Yes. From the flow stats event, you should be able to do something like:
> e.flows[0]["match"] to get the match dictionary to use with
> install_datapath_flow(), send_flow_command(), etc. for that flow.
>
> -- Murphy
>
> On Sep 2, 2011, at 3:16 PM, chris oleke wrote:
>
> > Hi,
> >
> > I am trying to create a rate-limiting functionality in my application
> using the flow statistics that I obtain from the switch. I'm using the
> byte_count from the flows to match against a threshold value that when
> exceeded will be used to prompt flows to be dropped. Is it possible to
> create a packet within NOX that I would use to install a flow just like the
> case in a packet_in_event? In other words I'd like to know if I can use the
> details obtained from a particular flow statistic to create a packet and
> consequently have a flow sent to the switch that will be used to drop the
> packets that match the flow.
> >
> >
> > Thanks,
> > Chris
> > _______________________________________________
> > nox-dev mailing list
> > nox-dev@noxrepo.org
> > http://noxrepo.org/mailman/listinfo/nox-dev
>
>
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