Linux Bonds Management

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ensla# modprobe -v bonding mode=0 arp_interval=100 arp_ip_target=192.168.1.254, 192.168.1.12
# tail -f /var/log/messages
# ifconfig bond0

#### To Add a Bond without restarting the Network #####
ifenslave bond0 eth2
echo "+bond0" >  /sys/class/net/bonding_masters
echo "+eth0" > /sys/class/net/bond0/bonding/slaves
echo "+eth1" > /sys/class/net/bond0/bonding/slaves

#### To remve a Bond #######
# ifenslave -d bond0 eth1
Or
# echo -eth1 > /sys/class/net/bond0/bonding/slaves

# ifconfig bond0 down
# echo "-eth0" > /sys/class/net/bond0/bonding/slaves
# echo "-eth1" > /sys/class/net/bond0/bonding/slaves
# echo "-bond0" > /sys/class/net/bonding_masters
# echo -bond0 > /sys/class/net/bonding_masters
# rmmod bonding


Configuring ifcfg-bond0 and ifcfg-bond1 interface on RHEL5

/etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0

ONBOOT=yes

IPADDR=192.168.0.1

NETMASK=255.255.255.0

TYPE=Ethernet

BONDING_OPTS="mode=1 miimon=100 downdelay=100 updelay=100 "

/etc/sysconfig/network-scripts/ifcfg-bond1

DEVICE=bond1

ONBOOT=yes

IPADDR=192.168.0.2

NETMASK=255.255.255.0

TYPE=Ethernet

BONDING_OPTS="mode=1 miimon=100 downdelay=100 updelay=100 "

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
===================================================================
To configure bond0 for balance-alb mode:
# ifconfig bond0 down
# echo 6 > /sys/class/net/bond0/bonding/mode
 - or -
# echo balance-alb > /sys/class/net/bond0/bonding/mode
 NOTE: The bond interface must be down before the mode can be
changed.
 
To enable MII monitoring on bond0 with a 1 second interval:
# echo 1000 > /sys/class/net/bond0/bonding/miimon
 NOTE: If ARP monitoring is enabled, it will disabled when MII
monitoring is enabled, and vice-versa.
 
To add ARP targets:
# echo +192.168.0.100 > /sys/class/net/bond0/bonding/arp_ip_target
# echo +192.168.0.101 > /sys/class/net/bond0/bonding/arp_ip_target
 NOTE:  up to 16 target addresses may be specified.
 
To remove an ARP target:
# echo -192.168.0.100 > /sys/class/net/bond0/bonding/arp_ip_target
 
To configure the interval between learning packet transmits:
# echo 12 > /sys/class/net/bond0/bonding/lp_interval
 NOTE: the lp_inteval is the number of seconds between instances where
the bonding driver sends learning packets to each slaves peer switch.  The
default interval is 1 second.

ONBOOT=yes

MASTER=bond0

SLAVE=yes

TYPE=Ethernet

/etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1

ONBOOT=yes

MASTER=bond1

SLAVE=yes

TYPE=Ethernet

/etc/sysconfig/network-scripts/ifcfg-eth2

DEVICE=eth2

ONBOOT=yes

MASTER=bond0

SLAVE=yes

TYPE=Ethernet

/etc/sysconfig/network-scripts/ifcfg-eth3

DEVICE=eth3

ONBOOT=yes

MASTER=bond1

SLAVE=yes

TYPE=Ethernet

Add the following lines to /etc/modprobe.conf

alias bond0 bonding

alias bond1 bonding

Then run the following command to activate the bond0 interface.

# modprobe bonding

But while adding a new Bond1 interface after bond0 we need to run the following command.

# echo +bond1 > /sys/class/net/bonding_masters

If we want to remove the bond interface we need to run the following command

# echo -bond1 > /sys/class/net/bonding_masters

Restart the network service and check if everything is operating smoothly.

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