Hi
I have three questions.
Question 1: I want to add a data flow in a specific switch among available
switches in the network.
I have used the following code with that intention that it will add a data flow
in the switch 4 (datapath=000000000004). Is this code ok, specifically the
matching field?
.....
..........
match = parser.OFPMatch(in_port=1, eth_dst='00:00:00:00:00:07',
eth_src='00:00:00:00:00:04', datapath=000000000004)
actions = [parser.OFPActionOutput(ofp.OFPP_NORMAL, ofproto.OFPCML_NO_BUFFER)]
inst = [parser.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS,actions)]
self.add_flow(datapath=datapath, command=ofp.OFPFC_ADD, priority=1, out_port=3,
match=match, instructions=inst)
........
....
Question 2: What will be happened to other switches if this matching becomes
partially true of them ?
because in other switches first three fields
(in_port=1, eth_dst='00:00:00:00:00:07', eth_src='00:00:00:00:00:04') will be
the same.
Question 3: How to verify that the switch is sending the flows or not ?
I used "ovs-ofctl -O OpenFlow13 dump-flows s4", but it
does not show the continuous monitoring. I am expecting something which will
continuously show the updates of that switch.
Thanks
-Tanvir
For your kind info, here is the used code.... [there are 4 switches (0...04,
0...05, 0...06, 0...07) in a SDN network. This code will add a flow from
0...04 to 0...07]
from operator import attrgetter
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER,
DEAD_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import (ofproto_v1_3, ether)
from ryu.lib import hub
from ryu.topology import event
from ryu.lib.packet import (packet, ethernet, arp, icmp, ipv4)
from ryu.lib.packet import ether_types
from ryu.app.wsgi import ControllerBase, WSGIApplication, route
from webob import Response
import time
class SimpleSW(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(SimpleSW, self).__init__(*args, **kwargs)
# a function that will send flows from switch to switch
def add_flow(self, datapath, command, priority, out_port, match, instructions):
ofproto = datapath.ofproto
ofp = datapath.ofproto
parser = datapath.ofproto_parser
flow_add = parser.OFPFlowMod(datapath=datapath, table_id=1, command=command,
buffer_id=ofp.OFP_NO_BUFFER, priority=priority, out_port=out_port,
match=match, instructions=instructions)
datapath.send_msg(flow_add)
# a function that will delete flows from switch to switch
def delete_flow(self, datapath, priority, match, out_port, out_group,
instructions ):
ofproto = datapath.ofproto
ofp = datapath.ofproto
parser = datapath.ofproto_parser
flow_del = parser.OFPFlowMod(datapath=datapath, priority=priority,
match=match, table_id=1, command=ofproto.OFPFC_DELETE, buffer_id=
ofp.OFP_NO_BUFFER, out_port=ofproto.OFPP_ANY, out_group=ofproto.OFPG_ANY,
instructions=instructions)
datapath.send_msg(flow_del)
# the packet handled by the controller
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
ofp = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
# out_port = msg.match['out_port']
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
dst = eth.dst
src = eth.src
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
ofp = datapath.ofproto
parser = datapath.ofproto_parser
mat00 = parser.OFPMatch(in_port=1, eth_dst='00:00:00:00:00:07',
eth_src='00:00:00:00:00:04', datapath=000000000004)
actions = [parser.OFPActionOutput(ofp.OFPP_NORMAL, ofproto.OFPCML_NO_BUFFER)]
inst = [parser.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS,actions)]
self.add_flow(datapath=datapath, command=ofp.OFPFC_ADD, priority=1, out_port=3,
match=mat00, instructions=inst)
# hub.sleep(2)
------------------------------------------------------------------------------
Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
Francisco, CA to explore cutting-edge tech and listen to tech luminaries
present their vision of the future. This family event has something for
everyone, including kids. Get more information and register today.
http://sdm.link/attshape
_______________________________________________
Ryu-devel mailing list
Ryu-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ryu-devel
