Hello everyone
I am new in python. I wanted to develop a ryu-app that will calculate shortest
path and push those flows to the switch. While doing this i faced the following
problem-
I wanted to match the ipv4 destination network to add flows. For that i made
the packet_in_handler as follows-(from ryu.lib.packet import ipv4) #
importing ipv4 protocol
def _packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
pkt = packet.Packet(msg.data)
ipv4 = pkt.get_protocol(ipv4.ipv4)
dst = ipv4.dst
src = ipv4.src
This gives the following error- UnboundLocalError: local variable 'ipv4'
referenced before assignment
Also for destination network matching what should be my match condition
destination network in
match = datapath.ofproto_parser.OFPMatch("destination_network")
Thank you in advance for your help.
Thanking you
sakib
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