配置linux双网卡绑定是遇到问题

问题总结
查看上网卡绑定时发现有一个网卡没有绑定上
查看了一下网线是否插好
[root@CDN-GZ-023 gmond]# ethtool em2
Settings for em2:
       Supported ports: [ TP ]
       Supported link modes:   10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Full
       Supported pause frame use: Symmetric
       Supports auto-negotiation: Yes
       Advertised link modes:  10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Full
       Advertised pause frame use: Symmetric
       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: d
       Wake-on: d
       Current message level: 0x00000007 (7)
                              drv probe link
       Link detected: yes
[root@CDN-GZ-023 gmond]# mii-tool em2
em2: negotiated 100baseTx-FD, link ok

从上面来看已经插好，看配置文件em2上少了下面一句
SLAVE=yes