bonding网卡链路down

当出现双网卡bonding的网线断开时候，日志如下：

Apr 18 15:18:38 server1.example.com kernel: : [66624539.368208] igb: slave1 NIC Link is Down
Apr 18 15:18:38 server1.example.com kernel: : [66624539.447092] bonding: eth0: link status definitely down for interface slave1, disabling it

参考 What does the message "bonding: bond0: link status definitely down for interface eth0, disabling it" mean 对于这种情况需要判断Link Down是否在 bonding: eth0: link status definitely down for interface slave1, disabling it之前，如果物理网线检测到Link is Down在之前，则表明确实检测到了物理网线断开。