CODEWITHSUNDEEP
pythonsdnopenflowopenvswitchryu
Umminur
Umminur

Reputation: 1

How can I collect flow IP protocol from SDN Switch, am using Ryu controller

I am trying to collect flow statistics from SDN switch using the Ryu controller. I need a code on how I can collect ip_protocol from each flow using OFPFLOWSTATREQUEST AND REPLY HANDLER and save in a CSV FILE.

This is the code I used:

def _protocol(self, dpid, flows):
       
        for flow in flows:
           m = {}
           for i in flow.match.items():
               key = list(i)[0]  # match key
               val = list(i)[1]  # match value
               if key == "ip_proto":
                   protocol = val
        return protocol

I got this error message after running the code:

File "/home/ai/SDN/daapp.py", line 780, in flow_stats_reply_handler
    protocol  = self._protocol(dpid, gflows[dpid])
  File "/home/ai/SDN/daapp.py", line 458, in _protocol
    return protocol
UnboundLocalError: local variable 'protocol' referenced before assignment

Upvotes: 0

Views: 221

Answers (1)

Zohreh Rezaei
Zohreh Rezaei

Reputation: 11

It may consider the protocol in return to be the same as the protocol to which the _protocol output is to be placed. When returning, consider another name for the protocol to solve the problem.

protocol  = self._protocol(dpid, gflows[dpid])

def _protocol(self, dpid, flows):
       
        for flow in flows:
           m = {}
           for i in flow.match.items():
               key = list(i)[0]  # match key
               val = list(i)[1]  # match value
               if key == "ip_proto":
                   prtcl = val
        return prtcl

Upvotes: 0

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