1. 安装轻量级网络仿真工具Mininet
先从GitHub上获取mininet源码,再输入命令进行安装,代码分别如下:
git clone https://github.com/mininet/mininet.git
cd mininet/util
./install.sh
运行结果如下:
2. 用字符命令搭建如下拓扑,要求写出命令
(1)拓扑结构如下:
输入命令:
sudo mn --topo linear,3
(2)拓扑结构如下:
(ctrl+D命令:退出这个网络 net 查看网络状态)
(注意:没搭建一次拓扑,要输入 "mn -c"来清除剩余缓存)
输入命令:
sudo mn --topo tree,fanout=3,depth=2
3. 利用可视化工具搭建如下拓扑,并要求支持OpenFlow 1.0 1.1 1.2 1.3,设置h1(10.0.0.10)、h2(10.0.0.11)、h3(10.0.0.12),拓扑搭建完成后使用命令验证主机ip,查看拓扑端口连接情况。
(1)在~/mininet/examples目录下打开终端,执行以下命令:
./miniedit.py
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(2)接下来打开可视化工具,通过利用可视化工具,可以更加方便的的搭建拓扑、使用命令查看状态。
配置完成后,执行run
(3)通过net命令可以查看网络拓扑:
(4)使用xterm语句验证主机ip,查看各个拓扑端口连接情况:
4. 利用Python脚本完成如下图所示的一个Fat-tree型的拓扑
(1)python代码如下:
#!/usr/bin/python
# sudo mn --custom fattree.py --topo mytopo --switch ovsk,protocols=OpenFlow10
"""Custom topology example
Adding the 'topos' dict with a key/value pair to generate our newly defined
topology enables one to pass in '--topo=mytopo' from the command line.
"""
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import RemoteController,CPULimitedHost
from mininet.link import TCLink
from mininet.util import dumpNodeConnections
class MyTopo(Topo):
"Simple topology example."
def __init__(self):
"Create custom topo."
# Initialize topology
Topo.__init__(self)
L1 = 2
L2 = 4
c = []
a = []
# add core ovs
for i in range(L1):
sw = self.addSwitch('s{}'.format(i+1))
c.append(sw)
# add aggregation ovs
for i in range(L2):
sw = self.addSwitch('s{}'.format(L1+i+1))
a.append(sw)
# add links between core and aggregation ovs
for i in range(L1):
sw1 = c[i]
for sw2 in a[0: :1]:
self.addLink(sw2, sw1)
#add hosts and its links with aggregation ovs
count = 1
for sw1 in a:
for i in range(2):
host = self.addHost('h{}'.format(count))
self.addLink(sw1, host)
count += 1
topos = {'mytopo': (lambda: MyTopo())}
(2)生成拓扑:
sudo mn --custom fattree.py --topo mytopo --switch ovsk,protocols=OpenFlow10