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mii-tool
===
配置网络设备协商方式的工具
## 补充说明
**mii-tool命令** 是用于查看、管理介质的网络接口的状态有时网卡需要配置协商方式比如10/100/1000M的网卡半双工、全双工、自动协商的配置。但大多数的网络设备是不用我们来修改协商因为大多数网络设置接入的时候都采用自动协商来解决相互通信的问题。不过自动协商也不是万能的有时也会出现错误比如丢包率比较高这时就要我们来指定网卡的协商方式。mii-tool就是能指定网卡的协商方式。下面我们说一说mii-tool的用法。
### 语法
```
usage: mii-tool [-VvRrwl] [-A media,... | -F media] [interface ...]
```
### 选项
```
-V 显示版本信息;
-v 显示网络接口的信息;
-R 重设MII到开启状态
-r 重启自动协商模式;
-w 查看网络接口连接的状态变化;
-l 写入事件到系统日志;
-A 指令特定的网络接口;
-F 更改网络接口协商方式;
media: 100baseT4, 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD,
        (to advertise both HD and FD) 100baseTx, 10baseT
```
### 实例
查看网络接口的协商状态:
```
[root@localhost ~]# mii-tool -v eth0
eth0: negotiated 100baseTx-FD, link ok
  product info: vendor 00:50:ef, model 60 rev 8
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
  link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
```
注:上面的例子,我们可以看得到是自动协商,注意红字的部份。
更改网络接口协商方式:
更改网络接口的协商方式,我们要用到`-F`选项后面可以接100baseT4, 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD等参数
如果我们想把网络接口eth0改为1000Mb/s全双工的模式应该怎么办呢
```
[root@localhost ~]# mii-tool -F 100baseTx-FD
[root@localhost ~]# mii-tool -v eth0
eth0: 100 Mbit, full duplex, link ok
product info: vendor 00:00:00, model 0 rev 0
basic mode: 100 Mbit, full duplex
basic status: link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
```
是不是已经改过来了当然我们也一样用ethtool工具来更改比如执行下面的命令
```
[root@localhost ~]# ethtool -s eth0 speed 100 duplex full
```
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