拓?fù)鋱D如下:

無(wú)控制器下的openflow流表下發(fā)演示

創(chuàng)建一個(gè)交換機(jī),3臺(tái)主機(jī),無(wú)控制器，流表手工下發(fā):

#?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

控制器代碼如下:

[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?

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)

總結(jié)

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