玩转Openvwitch第二站：Bridge和Controller

Bridge表结构如下：

我们先看其中的一项，就是Controller

OpenFlow配置项：从架构图中我们可以看出，openvwitch的一个bridge可以通过openflow协议，被一个统一的controller管理的。

一旦一个bridge连到一个openflow controller，则flow table就由controller统一管理，如果连接断了：

• secure： 这个bridge会试图一直连接controller，并不自己建立flow table

• standalone：一旦bridge三次连不上controller，就自己建立和管理flow table

OpenFlow Controller多种多样

http://groups.geni.net/geni/wiki/OpenFlow/Controllers

我们的这次试验使用Floodlight

首先创建三个虚拟机，都连接到Bridge ubuntu_br上

安装floodlight

• http://www.projectfloodlight.org/getting-started/

• git clone git://github.com/floodlight/floodlight.git

• cd floodlight/

• ant

• nohup java -jar target/floodlight.jar > floodlight.log 2>&1 &

设置Controller

ovs-vsctl set-controller ubuntu_br tcp:192.168.100.1:6633

访问floodlight的界面

http://16.158.166.150:8080/ui/index.html

Floodlight的Rest API

http://docs.projectfloodlight.org/display/floodlightcontroller/Floodlight+REST+API

默认情况下，三台机器可以相互ping的通

调用Rest API设定规则，只允许Instance01和Instance03之间相互通信

curl -d '{"switch": "00:00:2a:96:0e:c7:85:49", "name":"static-flow1", "cookie":"0", "priority":"32768", "src-mac":"52:54:00:9b:d5:11","active":"true", "actions":"output=12"}'  http://16.158.166.150:8080/wm/staticflowentrypusher/json

curl -d '{"switch": "00:00:2a:96:0e:c7:85:49", "name":"static-flow2", "cookie":"0", "priority":"32768", "src-mac":"52:54:00:9b:d5:77","active":"true", "actions":"output=10"}'  http://16.158.166.150:8080/wm/staticflowentrypusher/json

用REST API清除所有规则

curl http://16.158.166.150:8080/wm/staticflowentrypusher/clear/00:00:2a:96:0e:c7:85:49/json

将正确的mac导向正确的port

curl -d '{"switch": "00:00:2a:96:0e:c7:85:49", "name":"static-flow1", "cookie":"0", "priority":"32768", "dst-mac":"52:54:00:9b:d5:11","active":"true", "actions":"output=10"}'  http://16.158.166.150:8080/wm/staticflowentrypusher/json

curl -d '{"switch": "00:00:2a:96:0e:c7:85:49", "name":"static-flow2", "cookie":"0", "priority":"32768", "dst-mac":"52:54:00:9b:d5:33","active":"true", "actions":"output=11"}'  http://16.158.166.150:8080/wm/staticflowentrypusher/json

curl -d '{"switch": "00:00:2a:96:0e:c7:85:49", "name":"static-flow3", "cookie":"0", "priority":"32768", "dst-mac":"52:54:00:9b:d5:77","active":"true", "actions":"output=12"}'  http://16.158.166.150:8080/wm/staticflowentrypusher/json

接下来我们故意调整flow，使得本应该转发给Instance03的，强行转发给Instance02

从Instance01来ping Instance03，用tcpdump监听Instance02和Instance03，在这个过程中，用REST API将Instance03的包转发给Instance02

curl -d '{"switch": "00:00:2a:96:0e:c7:85:49", "name":"static-flow3", "cookie":"0", "priority":"32768", "dst-mac":"52:54:00:9b:d5:77","active":"true", "actions":"output=11"}'  http://16.158.166.150:8080/wm/staticflowentrypusher/json