Network Bonding/NIC Teaming is the creation of a single bonded interface by combining 2 or more Ethernet interfaces. This helps in high availability and performance improvement.

Step 1: Check the bond interface using ifconfig Command as shown below.

# ifconfig | grep -i bond

check network bonding status in Linux

Step 2: Bond interface files.

# cat /etc/sysconfig/network-scripts/ifcfg-bond0
BONDING_OPTS="mode=1 primary=eth0 miimon=100"
ONBOOT=yes
DEVICE=bond0
BOOTPROTO=none
BRIDGE=br0
TYPE=BOND

Step 3: Status of Bond interfaces.

# cat /proc/net/bonding/bond0

check NIC teaming status in Linux

According to the above Output , Active Passive Bonding is configured , where eth0 and eth4 are bonded together and form the bond interface(i.e bond0) . Lan cards eth0 & eth4 both are up and eth0 is active.