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IFCFG-BONDING

NAME
SYNOPSIS
Bonding Interfaces
Example
Additional Information
BUGS
AUTHOR
SEE ALSO

NAME

ifcfg-bonding − interface bonding configuration

SYNOPSIS

/etc/sysconfig/network/ifcfg-bond*

Bonding Interfaces

To setup a bonding interface you need a configuration file ifcfg-bond<X> with the usual network settings. But you must add additional variables
BONDING_MASTER

must be set to ’yes’ to identify this interface as a bonding interface

BONDING_SLAVE_<X>

here you specify the interface name representing the slave network interfaces.

Note: Please adopt the /etc/udev/rules.d/70-persistent-net.rules rule file to match the hardware by BUS id and not by the MAC address (default). Using MAC address, it is not possible to replace a defect NIC with a new one (having a different MAC), without to adopt either the MAC or the name of the slave interface in the configuration files.
Note also: Bonding slave interfaces are reserved for the bonding and are not usable for any another purposes (unlike e.g. interfaces used for VLANs) and the bonding master manages the slaves itself, e.g. it sets the MAC address on the slaves. To configure this accordingly, set BOOTPROTO=none in the ifcfg file of each slave interfaces to avoids any link-layer or IP setup on these interfaces.

BONDING_MODULE_OPTS

contains bonding options. Here you can set interface timeouts or working modes (’mode=active-backup’ for backup mode). For additional information take a look into the documentation mentioned at the bottom. Note, that this options are not passed as parameters to the bonding kernel module any more, but set via sysfs interface. This variable will be renamed in the feature.

BONDING_SKIP_REMOVE_WORKAROUND

When set to "yes", a bonding interface will be not removed while ifdown any more to avoid problems, e.g. when some third party kernel module, such as Veritas ’llt’ module, does not react correctly to the UNREGISTER event and does not remove its references to the bonding interface causing all network related operation to stuck.

Note: the bonding options are not reverted when this option is enabled and it is required to either explicitly keep the old options and set them to their default setting on bonding configuration changes or to reboot.

Example

Example for a bonding interface on eth0 and eth1 using the backup mode

ifcfg-bond0
STARTMODE=’onboot’
BOOTPROTO=’static’
IPADDR=’192.168.0.1/24’
BONDING_MASTER=’yes’
BONDING_SLAVE_0=’eth0’
BONDING_SLAVE_1=’eth1’
BONDING_MODULE_OPTS=’mode=active-backup miimon=100’

ifcfg-eth0
STARTMODE=’onboot’
BOOTPROTO=’none’
#ETHTOOL_OPTIONS=’wol g’

ifcfg-eth1
STARTMODE=’onboot’
BOOTPROTO=’none’
#ETHTOOL_OPTIONS=’wol g’

Additional Information

For additional and more general information take a look into /usr/src/linux/Documentation/networking/bonding.txt. Maybe you need to install the kernel sources to get this additional documentation.

The configuration of routes for this kind of interface does not differ from ordinary interfaces. See man routes for details.

BUGS

Please report bugs at <http://www.suse.de/feedback>

AUTHOR

Christian Zoz <zoz@suse.de> -- ifup script
Wilken Gottwalt <wgottwalt@suse.de> -- ifcfg-bonding manual page

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