Hi
I added the flow based on IPv4 addresses and TCP or UDP ports in the flow
table. I saw that the same flow is repeated three or more times although it
must be added once. Why this happens?
Here is the segment of code to add the flow
if(pkt.get_protocols(ethernet.ethernet) and pkt.get_protocols(ipv4.ipv4)):
(ip4,) = pkt.get_protocols(ipv4.ipv4) ipsrc = ip4.src
ipdst = ip4.dst protocol = ip4.proto
pkt_tcp = pkt.get_protocol(tcp.tcp) if pkt_tcp is not None:
src_port = pkt_tcp.src_port dst_port =
pkt_tcp.dst_port match = parser.OFPMatch(in_port=in_port,
eth_dst=dst, eth_src=src, eth_type=ether_types.ETH_TYPE_IP,
ipv4_src=ipsrc, ipv4_dst=ipdst, ip_proto=protocol,
tcp_src=src_port, tcp_dst=dst_port) else:
pkt_udp = pkt.get_protocol(udp.udp) if pkt_udp is not
None: src_port = pkt_udp.src_port
dst_port = pkt_udp.dst_port match =
parser.OFPMatch(in_port=in_port, eth_dst=dst, eth_src=src,
eth_type=ether_types.ETH_TYPE_IP,
ipv4_src=ipsrc, ipv4_dst=ipdst, ip_proto=protocol, udp_src=src_port,
udp_dst=dst_port) else: match =
parser.OFPMatch(in_port=in_port, eth_dst=dst, eth_src=src,
eth_type=ether_types.ETH_TYPE_IP,
ipv4_src=ipsrc, ipv4_dst=ipdst) print match # verify
if we have a valid buffer_id, if yes avoid to send both # flow_mod &
packet_out if msg.buffer_id != ofproto.OFP_NO_BUFFER:
self.add_flow(datapath, 1, match, actions, msg.buffer_id)
return else: self.add_flow(datapath, 1,
match, actions)
and here is the flow table:
datapath duration in-port eth-dst eth_src
ip_src ip_dst out-port ----------------
---------------- ----------------- --------------- --------------
---------------------- -------- -------- --------0000000000000002 8
1 f2:2f:b0:b2:45:7f da:ea:f7:30:9b:e5 10.0.0.1 10.0.0.6
2 0000000000000002 5 2 da:ea:f7:30:9b:e5
f2:2f:b0:b2:45:7f 10.0.0.6 10.0.0.1 1
0000000000000002 1 2 da:ea:f7:30:9b:e5 f2:2f:b0:b2:45:7f
10.0.0.6 10.0.0.1 1 0000000000000002 3 2
da:ea:f7:30:9b:e5 f2:2f:b0:b2:45:7f 10.0.0.6 10.0.0.1
1 0000000000000002 2 2 da:ea:f7:30:9b:e5
f2:2f:b0:b2:45:7f 10.0.0.6 10.0.0.1 1
0000000000000002 4 2 da:ea:f7:30:9b:e5 f2:2f:b0:b2:45:7f
10.0.0.6 10.0.0.1 1
------------------------------------------------------------------------------
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