About fail_over_mac option in network bonding active-backup mode
Environment and Prerequisite
If the slave is changed during a failover, the active slave will get the MAC address of the bond interface and the formerly active slave interface receives the newly active slave's MAC address. Failovermac option examples Example running environment. Example bonding setting is in (Ref) Bonding Setting; Host OS: Mac OS; Guest OS: CentOS 7.7.1908. Easy to use CAD editor for Mac. AutoQ3D CAD for Mac is a fast and easy to use 2D and 3D CAD editor for everyone. It lets you create, edit and share rapid models. AutoQ3D CAD for Mac is optimized for 64-bit architecture and Retina displays to make full use of your Mac.
- CentOS 7.7.1908
- Bash shell(/bin/bash)
- Network bonding
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fail_over_mac option
About fail_over_mac option
fail_over_mac
: It is an option which choose how to allocate MAC address to each bond and slave interfaces. Depends on its option value, the way which allocate MAC address to bond and slave interfaces changes.- This option is only valid in
active-backup
mode bonding. - Image reference source: https://www.ibm.com/support/knowledgecenter/en/linuxonibm/com.ibm.linux.z.l0wlcb00/l0wlcb00_optionfailovermac.html
fail_over_mac option types
none
or0
: (Default) This setting disables fail_over_mac and sets all of the bond and slave interfaces to the same MAC address. Usually first slave's MAC address is allocated to all bond and slave interfaces.active
or1
: The bond interface's MAC address is always the MAC address of the active slave interface. If the active slave interface is changed during a failover, the bond interface's MAC address is then changed to match the new active slave's MAC address.follow
or2
: The bond interface's MAC address is fixed(Usually first slave's MAC address is allocated) and it gives its MAC address to newly active slave interface. If the slave is changed during a failover, the active slave will get the MAC address of the bond interface and the formerly active slave interface receives the newly active slave's MAC address.
fail_over_mac option examples
Example running environment
- Example bonding setting is in (Ref) Bonding Setting
- Host OS: Mac OS
- Guest OS: CentOS 7.7.1908
- Hypervisor: VirtualBox
none or 0 option example
- Default option
- fail_over_mac=0
- In VirtualBox environment, it is not work well.
- bond0's and slaves'(enp0s8 and enp0s9) MAC addresses are same.
active or 1 option example
- fail_over_mac=1
- bond0's MAC address and first slave's(enp0s8) MAC address are same.
- Link down enp0s8 interface
- bond0's MAC address is changed to enp0s9's MAC address.
follow or 2 option example
- fail_over_mac=2
- In VirtualBox environment, it is not work well.
- bond0's MAC address and first slave's(enp0s8) MAC address are same.
- Link down enp0s8 interface
- bond0's MAC address is same as before.
- bond0's MAC address is allocated to newly active slave(enp0s9)
- enp0s9's previous MAC address is moved to enp0s8's MAC address which is failed.
(Ref) Bonding Setting
- Basic bonding settings are like below.
Interfaces
- Bonding Interface: bond0
- Slave Interfaces: enp0s8, enp0s9
bond0
- /etc/sysconfig/network-scripts/ifcfg-bond0
IPADDR
andPREFIX
could be different.fail_over_mac
can set be from 0 to 2.
enp0s8, enp0s9
- /etc/sysconfig/network-scripts/ifcfg-enp0s8
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- /etc/sysconfig/network-scripts/ifcfg-enp0s9
- Default option
- fail_over_mac=0
- In VirtualBox environment, it is not work well.
- bond0's and slaves'(enp0s8 and enp0s9) MAC addresses are same.
active or 1 option example
- fail_over_mac=1
- bond0's MAC address and first slave's(enp0s8) MAC address are same.
- Link down enp0s8 interface
- bond0's MAC address is changed to enp0s9's MAC address.
follow or 2 option example
- fail_over_mac=2
- In VirtualBox environment, it is not work well.
- bond0's MAC address and first slave's(enp0s8) MAC address are same.
- Link down enp0s8 interface
- bond0's MAC address is same as before.
- bond0's MAC address is allocated to newly active slave(enp0s9)
- enp0s9's previous MAC address is moved to enp0s8's MAC address which is failed.
(Ref) Bonding Setting
- Basic bonding settings are like below.
Interfaces
- Bonding Interface: bond0
- Slave Interfaces: enp0s8, enp0s9
bond0
- /etc/sysconfig/network-scripts/ifcfg-bond0
IPADDR
andPREFIX
could be different.fail_over_mac
can set be from 0 to 2.
enp0s8, enp0s9
- /etc/sysconfig/network-scripts/ifcfg-enp0s8
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- /etc/sysconfig/network-scripts/ifcfg-enp0s9
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