构建OVS网桥和OVS网桥相连的网络

将多个主机(物理机或虚拟机)连接到同一个网桥上,实现它们之间的通信,但是要构建复杂的网络,就需要多个网桥,在装有open vswitch的主机上建立两个网桥,实现它们之间的连接,构建结果如下:
构建OVS网桥和OVS网桥相连的网络_第1张图片

1. 新建网桥br

ovs-vsctl add-br br0   //添加一个名为br0的网桥
ovs-vsctl add-br br1   //添加一个名为br0的网桥

2. 新建虚拟端口并打patch

ovs-vsctl add-port br0 patch-to-br1   //为br0添加一个虚拟端口
ovs-vsctl set interface patch-to-br1 type=patch   //把patch-to-br1的类型设置为patch
ovs-vsctl set interface patch-to-br1 options:peer=patch-to-br0   //把对端网桥和此网桥连接的端口名称设置为patch-to-br0

以及:

ovs-vsctl add-port br1 patch-to-br0   //为br0添加一个虚拟端口
ovs-vsctl set interface patch-to-br0 type=patch   //把patch-to-br0的类型设置为patch
ovs-vsctl set interface patch-to-br0 options:peer=patch-to-br1   //把对端网桥和此网桥连接的端口名称设置为patch-to-br1

3. 备注

1) 以下两个是对ovs-database的操作,有兴趣的同学可以参考ovs-vswitchd.conf.db.5
ovs-vsctl set interface patch-to-br0type=patch
ovs-vsctl set interface patch-to-br0 options:peer=patch-to-br1
2) tcpdump抓包无法获取patch端口的数据包

root@node2:/tmp/zq# tcpdump -i patch-to-con
tcpdump: patch-to-con: No such device exists
(SIOCGIFHWADDR: No such device)

而:NAT的网口可以…

root@node2:/tmp/zq# tcpdump -i eout-if -n
tcpdump: WARNING: eout-if: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eout-if, link-type EN10MB (Ethernet), capture size 65535 bytes
15:33:49.793172 ARP, Request who-has 192.168.19.69 tell 192.168.19.11, length 46
^C
1 packet captured
3 packets received by filter
0 packets dropped by kernel

4. 为两个网桥添加物理网卡

在两台机器上分别安装上open vswitch并创建网桥,分别为两个网桥添加物理网卡,然后通过网线连接两个网桥,实现两个网桥之间的互通。构建结果图如下:

host1

ovs-vsctl add-br br0           //添加名为br0的网桥
ovs-vsctl add-port br0 eth0    //把eth0挂接到br0上

host2

ovs-vsctl add-br br0             //添加名为br0的网桥
ovs-vsctl add-port br0 eth0      //把eth0挂接到br0上

然后使用网线把host1的eth0和host2的eth0相连即可。

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