Even though bonding has been configured for mode 1 [active backup], it still shows as Mode 0 [Round-

博客围绕Red Hat Enterprise Linux系统展开，指出即便在/etc/modprobe.conf中配置为模式1绑定，运行cat /proc/net/bonding/bond0仍显示为模式0。给出两种解决办法，一是重新加载绑定驱动或重启系统，二是更新initscripts及其依赖版本。

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SOLUTION 已验证 - 已更新 2016年八月15日15:13 -

English

环境

Red Hat Enterprise Linux, all versions

问题

Although the system has been configured with mode 1 bonding in /etc/modprobe.conf, running cat /proc/net/bonding/bond0 still shows the bonding to be configured as mode 0 [round-robin]:

Raw

  Ethernet Channel Bonding Driver: v2.6.3-rh (June 8, 2005)

  Bonding Mode: load balancing (round-robin)
  MII Status: up
  MII Polling Interval (ms): 100
  Up Delay (ms): 0
  Down Delay (ms): 0

  Slave Interface: eth0
  MII Status: up
  Link Failure Count: 0
  Permanent HW addr: 00:0c:29:40:be:67

  Slave Interface: eth1
  MII Status: up
  Link Failure Count: 0
  Permanent HW addr: 00:0c:29:40:be:71

决议

Reload the bonding driver or reboot the system. To reload the bonding driver:

Raw

 # service network stop
 # modprobe -r -v bonding     -- or # modprobe -r -v bonding -o bond0
 # service network start

Running cat /proc/net/bonding/bond0 now shows mode 1:

Raw

 Ethernet Channel Bonding Driver: v2.6.3-rh (June 8, 2005)

 Bonding Mode: fault-tolerance (active-backup)
 Primary Slave: None
 Currently Active Slave: eth0
 MII Status: up
 MII Polling Interval (ms): 100
 Up Delay (ms): 0
 Down Delay (ms): 0

 Slave Interface: eth0
 MII Status: up
 Link Failure Count: 0
 Permanent HW addr: 00:0c:29:40:be:67

 Slave Interface: eth1
 MII Status: up
 Link Failure Count: 0
 Permanent HW addr: 00:0c:29:40:be:71

Another possible resolution that can be applied is to update the version of initscripts and its dependencies.
Previous version such as initscripts-9.03.31-2.el6.x86_64 on Rhel 6.3 has been known to cause this issue.