拓扑图如下:
无控制器下的openflow流表下发演示
创建一个交换机,3台主机,无控制器，流表手工下发:
# mn --topo single,3 --controller=none --mac
mininet>sh ovs-ofctl add-flow s1 "table=0,dl_dst=00:00:00:00:00:01,dl_type=0x0800,actions=output:1"
mininet>sh ovs-ofctl add-flow s1 "table=0,dl_dst=00:00:00:00:00:02,dl_type=0x0800,actions=output:2"
mininet>sh ovs-ofctl add-flow s1 "table=0,dl_dst=00:00:00:00:00:03,dl_type=0x0800,actions=output:3"
mininet>sh ovs-ofctl add-flow s1 "table=0,priority=100,dl_type=0x0806,actions=flood"
有控制器下的演示:
用RYU作控制器:
[root@localhost~]# ryu-manager simple_controller.py
[root@localhost~]# mn --topo single,3 --mac --controller=remote,ip=127.0.0.1,port=6633
mininet> h1 ping h2 -c2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.049 ms
64 bytes from 10.0.0.2: icmp_seq=2 ttl=64 time=0.061 ms
--- 10.0.0.2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1004ms
rtt min/avg/max/mdev = 0.049/0.055/0.061/0.006 ms
mininet>
mininet> sh ovs-ofctl dump-flows s1
NXST_FLOW reply (xid=0x4):
cookie=0x0, duration=2067.822s, table=0, n_packets=142, n_bytes=5964, idle_age=5, priority=100,arp actions=FLOOD
cookie=0x0, duration=2066.811s, table=0, n_packets=1934, n_bytes=189532, idle_age=0, priority=10,ip,dl_dst=00:00:00:00:00:02 actions=output:2
cookie=0x0, duration=2065.819s, table=0, n_packets=1949, n_bytes=191002, idle_age=0, priority=10,ip,dl_dst=00:00:00:00:00:01 actions=output:1
cookie=0x0, duration=185.310s, table=0, n_packets=17, n_bytes=1666, idle_age=168, priority=10,ip,dl_dst=00:00:00:00:00:03 actions=output:3
cookie=0x0, duration=194.586s, table=0, n_packets=10, n_bytes=756, idle_age=185, priority=0 actions=CONTROLLER:65535
控制器代码如下:
[root@localhost~]# cat simple_controller.py
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.ofproto import ofproto_v1_3_parser
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet,arp,ipv4
from ryu.lib.packet import ether_types
from ryu.lib.packet import ipv4
from ryu.topology import switches
from ryu.topology.event import EventSwitchEnter, EventSwitchLeave
mac2port = { "00:00:00:00:00:01":1,
"00:00:00:00:00:02":2,
"00:00:00:00:00:03":3,
}
class SimpleSwitch13(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(SimpleSwitch13, self).__init__(*args, **kwargs)
self.mac_to_port = {}
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
table_id = 0
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, table_id, 0, match, actions)
def add_flow(self, datapath, table_id ,priority, match, actions, buffer_id=None):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
if buffer_id:
mod = parser.OFPFlowMod(datapath=datapath, table_id = table_id, command=ofproto.OFPFC_ADD, buffer_id=buffer_id,
priority=priority, match=match, instructions=inst)
else:
mod = parser.OFPFlowMod(datapath=datapath, table_id = table_id, command=ofproto.OFPFC_ADD, priority=priority,
match=match, instructions=inst)
datapath.send_msg(mod)
def init_flow(self, datapath, table_id, priority, match, inst):
"""Create OFP flow mod message."""
ofproto = datapath.ofproto
out = datapath.ofproto_parser.OFPFlowMod(datapath=datapath,
table_id=table_id,
command=ofproto.OFPFC_ADD,
priority=priority,
match=match,
instructions=inst)
datapath.send_msg(out)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
# If you hit this you might want to increase
# the "miss_send_length" of your switch
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",
ev.msg.msg_len, ev.msg.total_len)
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
dst_mac = eth.dst
src_mac = eth.src
dpid = datapath.id
print eth.ethertype
self.logger.info("packet in %s %s %s %s", dpid, src_mac, dst_mac, in_port)
if eth.ethertype == ether_types.ETH_TYPE_ARP:
dst_ip = pkt.get_protocol(arp.arp).dst_ip
src_ip = pkt.get_protocol(arp.arp).src_ip
out_port = ofproto.OFPP_FLOOD
table_id = 0
match = parser.OFPMatch(eth_type=0x0806)
actions =[parser.OFPActionOutput(out_port)]
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,actions)]
self.init_flow(datapath, table_id, 100, match, inst)
if eth.ethertype == ether_types.ETH_TYPE_IP:
out_port = mac2port[dst_mac]
table_id = 0
match = parser.OFPMatch(eth_type=0x0800,eth_dst = dst_mac)
actions =[parser.OFPActionOutput(out_port)]
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,actions)]
self.init_flow(datapath, table_id, 10, match, inst)
