Centos 6.5 下通过ethtool限制网卡速率

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操作环境：

Centos 6.5 x86_64

ethtool

操作步骤：

查看此时网口em1设备信息

[root@ceph-osd-2 ~]# ethtool em1Settings for em1:        Supported ports: [ TP ]        Supported link modes:   10baseT/Half 10baseT/Full                                 100baseT/Half 100baseT/Full                                 1000baseT/Full         Supported pause frame use: No        Supports auto-negotiation: Yes        Advertised link modes:  10baseT/Half 10baseT/Full                                 100baseT/Half 100baseT/Full                                 1000baseT/Full         Advertised pause frame use: No        Advertised auto-negotiation: Yes        Speed: 1000Mb/s        Duplex: Full        Port: Twisted Pair        PHYAD: 1        Transceiver: internal        Auto-negotiation: on        MDI-X: Unknown        Supports Wake-on: g        Wake-on: d        Link detected: yes

使用ethtool显示em1网口速率，提示无法设置

[root@ceph-osd-2 ~]# ethtool -s em1 speed 100Cannot advertise speed 100

后来查找资料，正确设置方法如下

#ethtool -s em1 speed 100 duplex full autoneg off

查看此时em1网口信息

[root@ceph-osd-2 ~]# ethtool em1Settings for em1:        Supported ports: [ TP ]        Supported link modes:   10baseT/Half 10baseT/Full                                 100baseT/Half 100baseT/Full                                 1000baseT/Full         Supported pause frame use: No        Supports auto-negotiation: Yes        Advertised link modes:  Not reported        Advertised pause frame use: No        Advertised auto-negotiation: No        Speed: 100Mb/s        Duplex: Full        Port: Twisted Pair        PHYAD: 1        Transceiver: internal        Auto-negotiation: off        MDI-X: Unknown        Supports Wake-on: g        Wake-on: d        Link detected: yes

配置成功

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