我正在使用Mininet，RYU控制器和OpenFlow 1.3来创建一个拓扑，其中主机 h1 使用交换机 p0es0 连接到主机 h2 ，方法如下：
h1 h1-eth0:p0es0-eth3
h2 h2-eth0:p0es0-eth4
在我的Ryu Controller应用程序中，我有以下代码片段在我的 p0es0 开关上安装规则，以便能够从h2到达h1，反之亦然：
# Install rule to forward packets destined to "10.0.0.2" (h2) via port 3
ofproto = sw.ofproto
match = sw.ofproto_parser.OFPMatch( eth_type = 0x0800, ipv4_dst="10.0.0.1")
action = sw.ofproto_parser.OFPActionOutput(4)
inst = [sw.ofproto_parser.OFPInstructionActions(sw.ofproto.OFPIT_APPLY_ACTIONS, [action])]
mod = sw.ofproto_parser.OFPFlowMod(datapath=sw, match=match,
instructions=inst, cookie=0, command=ofproto.OFPFC_ADD, idle_timeout=0,
hard_timeout=0, priority=100, flags=ofproto.OFPFF_SEND_FLOW_REM)
sw.send_msg(mod)
# Install rule to forward packets destined to "10.0.0.1" (h1) via port 4
match = sw.ofproto_parser.OFPMatch( eth_type = 0x0800, ipv4_dst="10.0.0.1")
action = sw.ofproto_parser.OFPActionOutput(4)
inst = [sw.ofproto_parser.OFPInstructionActions(sw.ofproto.OFPIT_APPLY_ACTIONS, [action])]
mod = sw.ofproto_parser.OFPFlowMod(datapath=sw, match=match,
instructions=inst, cookie=0, command=ofproto.OFPFC_ADD, idle_timeout=0,
hard_timeout=0, priority=100, flags=ofproto.OFPFF_SEND_FLOW_REM)
sw.send_msg(mod)
我的dump-flow命令按预期确认交换机中规则的正确安装：
*** p0es0 ---------------------------------------------- -------------------
OFPST_FLOW回复（OF1.3）（xid = 0x2）：
cookie = 0x0，duration = 1103.417s，table = 0，n_packets = 0，n_bytes = 0，send_flow_rem priority = 100，ip， nw_dst=10.0.0.2 actions=output:4
cookie = 0x0，duration = 1103.414s，table = 0，n_packets = 0，n_bytes = 0，send_flow_rem priority = 100，ip， nw_dst=10.0.0.1 actions=output:3
但是，当我尝试从 h1 ping h2 时，反之亦然，我得到目标主机无法访问错误 . 我尝试在 p0es0-eth3 上使用tcpdump - 我只看到ARP请求数据包 .
我在这里错过了什么吗？
谢谢 .
1 回答
我在没有arp标志的情况下运行Mininet . 添加arp选项修复了我的问题 .
即，sudo mn --arp --custom fTreeTopo.py --topo ftreetopo --controller = remote，ip = 127.0.0.1