Bonding- modprobe.conf items

[Dave Augustus]

Just saw this in one of my servers in /etc/modprobe.conf

alias bond0 bonding
alias bond1 bonding
options bonding mode=active-backup max_bonds=2


Here is the explanation of the bonding modes:

# bonding modes:
#  0 sets a round-robin policy for fault tolerance (FT) and load
balancing (LB)
#  1 sets an active-backup policy for FT
#  2 sets an xor (exclusive-or) policy for FT and LB
#  3 sets a broadcast policy for FT
#  4 sets an IEEE 802.3ad dynamig link aggregation policy
#  5 sets a transmit load balancing (TLB) policy for FT and LB
#  6 sets an active load balancing (ALB) policy for FT and LB
#


Thanks,
Dave

[James Cammarata]

On Tue, 23 Sep 2008 16:31:27 -0500, Dave Augustus <davea(a)support.kcm.org&gt;
wrote:
>  Just saw this in one of my servers in /etc/modprobe.conf
>  
>  alias bond0 bonding
>  alias bond1 bonding
>  options bonding mode=active-backup max_bonds=2
>  
>  
>  Here is the explanation of the bonding modes:
>  
>  # bonding modes:
>  #  0 sets a round-robin policy for fault tolerance (FT) and load
>  balancing (LB)
>  #  1 sets an active-backup policy for FT
>  #  2 sets an xor (exclusive-or) policy for FT and LB
>  #  3 sets a broadcast policy for FT
>  #  4 sets an IEEE 802.3ad dynamig link aggregation policy
>  #  5 sets a transmit load balancing (TLB) policy for FT and LB
>  #  6 sets an active load balancing (ALB) policy for FT and LB
>  # 
There are a few more options than even this, for instance in our configs
where we have active-backup we specifically set which nic is the primary
interface.  Not sure if we want to account for all possible options, but
there are more.

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[Phil Manuel]

On 24/09/2008, at 7:36 AM, James Cammarata wrote:

>  On Tue, 23 Sep 2008 16:31:27 -0500, Dave Augustus <davea(a)support.kcm.org 
>  >
>  wrote:
> > Just saw this in one of my servers in /etc/modprobe.conf
> >
> > alias bond0 bonding
> > alias bond1 bonding
> > options bonding mode=active-backup max_bonds=2
> >
> >
> > Here is the explanation of the bonding modes:
> >
> > # bonding modes:
> > #  0 sets a round-robin policy for fault tolerance (FT) and load
> > balancing (LB)
> > #  1 sets an active-backup policy for FT
> > #  2 sets an xor (exclusive-or) policy for FT and LB
> > #  3 sets a broadcast policy for FT
> > #  4 sets an IEEE 802.3ad dynamig link aggregation policy
> > #  5 sets a transmit load balancing (TLB) policy for FT and LB
> > #  6 sets an active load balancing (ALB) policy for FT and LB
> > #
>
>  There are a few more options than even this, for instance in our  
>  configs
>  where we have active-backup we specifically set which nic is the  
>  primary
>  interface.  Not sure if we want to account for all possible options,  
>  but
>  there are more.
>  
You can also add the options to the ifcfg-bond0 file as below:-

DEVICE=bond0
ONBOOT=yes
BOOTPROTO=static
IPADDR=<ip address>
NETMASK=255.255.255.0
BONDING_OPTS="mode=active-backup miimon=100"

Some documentation can be found here
http://www.id.ethz.ch/about/sections/kom/dkid/themas/link-aggregation/bon...

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[Charles Duffy]

Phil Manuel wrote:
> >> alias bond0 bonding
> >> alias bond1 bonding
> >> options bonding mode=active-backup max_bonds=2 
Bad approach -- forces both bond devices to use the same options. With 
RHEL4/CentOS 4, the following is more appropriate:

# for RHEL4:
# install module on a per-interface basis, with options given here
# mail may wrap, should be one line:
install bond0 /sbin/modprobe --ignore-install -o bond0 bonding 
mode=active-backup max_bonds=2

# for RHEL5:
# use BONDING_OPTS in ifcfg-bond0 to set options; only use alias here
alias bond0 bonding

>  DEVICE=bond0
>  ONBOOT=yes
>  BOOTPROTO=static
>  IPADDR=<ip address>
>  NETMASK=255.255.255.0
>  BONDING_OPTS="mode=active-backup miimon=100" 
This mechanism should be used in RHEL/CentOS 5, and is not supported prior.