3
1、分组情况
|
| ---- | ---- | ---- | ---- |
|
|
|
|
2实现关键
搭建拓扑代码
from mininet.topo import Topo
class MyTopo( Topo ):
def __init__( self ):
# initilaize topology
Topo.__init__( self )
# add hosts and switches
host1 = self.addHost( 'h1' )
host2 = self.addHost( 'h2' )
host3 = self.addHost( 'h3' )
host4 = self.addHost( 'h4' )
switch1 = self.addSwitch( 's1' )
switch2 = self.addSwitch( 's2' )
switch3 = self.addSwitch( 's3' )
switch4 = self.addSwitch( 's4' )
# add links
self.addLink(host1,switch1)
self.addLink(switch1,switch2)
self.addLink(switch1,switch3)
self.addLink(switch1,switch4)
self.addLink(switch2,switch4)
self.addLink(switch3,switch4)
self.addLink(switch4,host2)
self.addLink(switch4,host3)
self.addLink(switch4,host4)
topos = { 'mytopo': ( lambda: MyTopo() ) }
流表代码：
设置h2发往s4的端口1的流表，优先级最高
h2_to_s4_1 ='{"flow": [{"id": "41","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "115","cookie": "1","table_id": "0"}]}'
lh2_to_s4_1 ='{"flow": [{"id": "41","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "2"},"order": "0"}]}}]},'\
'"priority": "105","cookie": "1","table_id": "0"}]}'
#设置h3发往s4的端口1的流表，优先级最高
h3_to_s4_1 ='{"flow": [{"id": "51","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "115","cookie": "1","table_id": "0"}]}'
#设置h4发往s4的端口1的流表，优先级最高
h4_to_s4_1 ='{"flow": [{"id": "61","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.4/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "115","cookie": "1","table_id": "0"}]}'
#当s4的端口1流量满载时，h2发的数据包走端口2,3的流表，优先级高
h2_to_s4_2 ='{"flow": [{"id": "42","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "2"},"order": "0"}]}}]},'\
'"priority": "112","cookie": "1","table_id": "0"}]}'
h2_to_s4_3 ='{"flow": [{"id": "43","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "3"},"order": "0"}]}}]},'\
'"priority": "110","cookie": "1","table_id": "0"}]}'
#当s4的端口1流量满载时，h3发的数据包走端口2,3的流表，优先级高
h3_to_s4_2 ='{"flow": [{"id": "52","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "2"},"order": "0"}]}}]},'\
'"priority": "112","cookie": "1","table_id": "0"}]}'
h3_to_s4_3 ='{"flow": [{"id": "53","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.3/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "3"},"order": "0"}]}}]},'\
'"priority": "110","cookie": "1","table_id": "0"}]}'
#当s4的端口1流量满载时，h4发的数据包走端口2,3的流表，优先级高
h4_to_s4_2 ='{"flow": [{"id": "62","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.4/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "2"},"order": "0"}]}}]},'\
'"priority": "112","cookie": "1","table_id": "0"}]}'
h4_to_s4_3 ='{"flow": [{"id": "63","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.4/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "3"},"order": "0"}]}}]},'\
'"priority": "110","cookie": "1","table_id": "0"}]}'
#s2流表
s2_2to1='{"flow": [{"id": "1","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "105","cookie": "1","table_id": "0"}]}'
#s3流表
s3_2to1='{"flow": [{"id": "1","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "105","cookie": "1","table_id": "0"}]}'
#s1流表
s1_234to1='{"flow": [{"id": "1","match": {"ethernet-match":'\
'{"ethernet-type": {"type": "2048"}},'\
'"ipv4-source":"10.0.0.2/32","ipv4-destination": "10.0.0.1/32"},'\
'"instructions": {"instruction": [{"order": "0",'\
'"apply-actions": {"action": [{"output-action": {'\
'"output-node-connector": "1"},"order": "0"}]}}]},'\
'"priority": "105","cookie": "1","table_id": "0"}]}'
headers = {'Content-type': 'application/json'}
操作步骤：
a.在创建拓扑前，先打开opendaylight控制器
b.创建拓扑，并查看拓扑结构
c.测试主机之间的连通
d.wireshark抓包监控流量
e.调用负载均衡程序controller.py，使用sudo python controller.py命令执行
f.查看交换机s2流表项
3、心得体会
a.胡佳伟
SDN, software Defined Network 是对传统网络架构的一次革新。经过短短两个月的学习和实践，我对sdn有了初步了解。SDN，软件定义网络，关键就是弄清楚三件事:网络、软件、软件与网络怎么结合。经过几次实验我对这些方面都有了一定了解，同时还学会了虚拟机的使用已经一些python、java的编程知识，对接口的应用也有了一定的了解。
b.黄霄瑞
学期刚开始老师就有问我们对sdn了解多少，其实当时我对sdn毫无了解，甚至都没有听过这个东西，听老师介绍后感觉又是网络又是编程这东西好难搞啊，后面老师给我们一步一步讲解，并且给我布置实验作业，我通过对实验的完成对sdn有了越来越深的了解，感觉它听着难但是真正去实践的话就还好。希望以后还有更多的机会接触和学习sdn。
c.贺劲渲
最开始选这门课时候其实没啥概念，只是为了学习要求的小贰分而已，这学期不选这个下学期也得大数据，开学后通过老师的讲解，我发现了这学分修得很有意义，sdn是一个新兴的方向，相对于传统网络结构它有着很多的优点，并且有着很大的探索空间，目前网络上关于它的知识也很少，我感觉这会是一个很有前景的方向，希望以后有机会在这方面有所发展。
d.陈书航
上学期刚学完了计算机网络，在选课时看到软件定义网络瞬间就来了兴趣，网络还能与软件挂上关系，我毅然决然选了这门课，通过课程的学习我初步了解了sdn究竟是个什么能干什么，特别是在学习过程中的几个实验确实很有意思，让我了解了不一样的网络与编程，虽然有时候会遇到困难，但克服之后可取反而更多，今后我也会继续学习相关知识，寻找其中乐趣。
浙公网安备 33010602011771号