Centos 6.5 下通过ethtool限制网卡速率

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 em1
Settings 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 100
Cannot 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 em1
Settings 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