Hi, I was working on multicasting implementation. The scenario was host 1
multicast packets to h2 and h3.
So my switch will change ipv4_dst = 10.0.0.2 and 10.0.0.3 respectively and
output to h2(port 2) and h3(port 3).
I use group table to do this.
I put my initialization code under Event EventOFPStateChange, it looks like this
@set_ev_cls(ofp_event.EventOFPStateChange, [MAIN_DISPATCHER, DEAD_DISPATCHER])
def _state_change_handler(self, ev):
datapath = ev.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
self.logger.info("*****Initialization*****")
# install a group table
actions1 = [parser.OFPActionSetField(ipv4_dst=“10.0.0.2”),
parser.OFPActionOutput(2)]
actions2 = [parser.OFPActionSetField(ipv4_dst=“10.0.0.3”),
parser.OFPActionOutput(3)]
buckets = [parser.OFPBucket(weight=0, watch_port=0, watch_group=0,
actions=actions1),
parser.OFPBucket(weight=0, watch_port=0, watch_group=0,
actions=actions2)]
req = parser.OFPGroupMod(datapath=datapath,
command=ofproto.OFPFC_ADD,
type_=ofproto.OFPGT_ALL,
group_id=0,
buckets=buckets)
datapath.send_msg(req)
self.logger.info("1. Install Group Table”)
match = parser.OFPMatch(in_port=1, eth_dst="00:00:00:00:00:02")
actions = [parser.OFPActionGroup(0)]
self.add_flow(datapath, 2, match, actions)
self.logger.info("*****Initialization*****”)
def add_flow(self, datapath, priority, match, actions):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
match=match, instructions=inst)
datapath.send_msg(mod)
// packet_in event handler (all the rest is same as simple_switch_13.py)
First, when launching my code, the group table will set up and add one flow
entry into table: when match in_port =1 (from h1) and eth_dst =
“00:00:00:00:00:02” (which is h2), the action will be taken is direct to group
table 0, which I created above.
When I use mininet to h1 ping h2, the first 6 pings are successful, but after 6
it stuck, I don’t know why.
The dpctl is even not working, it has message like this.
ubuntu@ip-172-31-12-125:~$ sudo dpctl unix:/tmp/s1 stats-flow
Jan 24 02:11:14|00001|vconn_unix|ERR|/tmp/vconn-unix.11620.0: connection to
/tmp/s1 failed: Connection refused
dpctl: Error connecting to switch unix:/tmp/s1. (Connection refused)
So I can’t even check the flow table.
Is my logic wrong of doing this ??
Thank you!------------------------------------------------------------------------------
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