Failover Bonding

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Ethernet NIC configuration for Failover Teaming

The following guide is for the Red Hat Based distributions.

Bond in modprobe

Execute the following on the server to add the bonding module:

 # echo "alias bond0 bonding" >> /etc/modprobe.conf

Create interfaces (bond and eth)

Create a new bonding interface:

 # vi /etc/sysconfig/network-scripts/ifcfg-bond0
 	ONBOOT=yes
 	DEVICE=bond0
 	BOOTPROTO=static
 	IPADDR=<IP_Addr>
 	NETMASK=<Mask>
 	BONDING_OPTS="mode=1 miimon=100"

Tip

Tips

If you want an other mode than the active-passive failover, you should modify the mode 1 of the BONDING_OPTS.

Assign ethX interface to this new interface to bond0. For each ethX Interface you have to create the file ifcfg-ethX like this:

 # vi /etc/sysconfig/network-scripts/ifcfg-eth<X>
 	ONBOOT=yes
 	DEVICE=eth<X>
 	MASTER=bond0
 	SLAVE=yes

Note

Note

You have to replace the number of the eth interface <x>. Note that will not be always eth0 and eth1. Here is the way to determinate on witch interface the cables are plugged in:

# for i in `seq 0 9`; do printf "eth$i:"; ethtool eth$i | grep Link; done

Attention

Attention

In case of hardware server, the ports on the switch where it is plugged are fixed: Full Duplex and 100 or 1000 Mbps (depending of what the server NICs are capable).

How to know the NIC capability:

# ethtool eth<x>
  	[...]
  	Supported link: 10baseT/Half 10baseT/Full
  			100baseT/Half 100baseT/Full
  			1000baseT/Full
  	[...]

According to this information, you will add one of those line in the /etc/sysconfig/network-scripts/ifcfg-eth<x> file:

  • If the eth is only 100Mbps capable:
ETHTOOL_OPTS="speed 100 duplex full autoneg off"
  • And if the eth is 1000Mbps capable:
ETHTOOL_OPTS="speed 1000 duplex full autoneg on"

References