====== Centos Bonding ======

CentOS 6 Channel Bonding allows administrators to bind multiple network interfaces together into a single channel using the bonding kernel module and a special network interface called a channel bonding interface. Channel bonding enables two or more network interfaces to act as one, simultaneously increasing the bandwidth and providing redundancy.

CentOS 6 Channel Bonding
Channel bonding (also known as “Ethernet bonding”) is a computer networking arrangement in which two or more network interfaces on a host computer are combined for redundancy or increased throughput.

<code>
mode=0 (Balance-rr) – This mode provides load balancing and fault tolerance.
mode=1 (active-backup) – This mode provides fault tolerance.
mode=2 (balance-xor) – This mode provides load balancing and fault tolerance.
mode=3 (broadcast) – This mode provides fault tolerance.
mode=4 (802.3ad) – This mode provides load balancing and fault tolerance.
mode=5 (balance-tlb) – Prerequisite: Ethtool support in the base drivers for retrieving the speed of each slave.
mode=6 (balance-alb) – Prerequisite: Ethtool support in the base drivers for retrieving the speed of each slave.
</code>

Note: Always append extra configuration in case of a rollback.

Configuring Channel Bonding
  # cd /etc/sysconfig/network-scripts/
  # vi ifcfg-bond0

We’ll be using mode=6 (balance-alb)

  DEVICE=bond0
  USERCTL=no
  BOOTPROTO=none
  ONBOOT=yes
  IPADDR=10.0.0.10
  NETMASK=255.255.0.0
  NETWORK=10.0.0.0
  BONDING_OPTS="miimon=100 mode=balance-alb"
  TYPE=Unknown
  IPV6INIT=no

  # vi ifcfg-eth0

  DEVICE=eth0
  BOOTPROTO=none
  ONBOOT=yes
  MASTER=bond0
  SLAVE=yes
  USERCTL=no

  # vi ifcfg-eth1

  DEVICE=eth1
  BOOTPROTO=none
  ONBOOT=yes
  MASTER=bond0
  SLAVE=yes
  USERCTL=no

  # vi ifcfg-eth2

  DEVICE=eth2
  BOOTPROTO=none
  ONBOOT=yes
  MASTER=bond0
  SLAVE=yes
  USERCTL=no

Due to the fact that /etc/modprobe.conf has been deprecated in CentOS 6, the process of bonding network interfaces has changed a bit.

Now instead of defining your bond in your /etc/modprobe.conf, you define it in /etc/modprobe.d/bonding.conf

  # vi /etc/modprobe.d/bonding.conf

Append the following onto the end out your modprobe config file


  alias bond0 bonding

  # servive network restart
====== links ======

[[http://www.how2centos.com/centos-6-channel-bonding/]]