Bind multiple NICs using nmcli commands in Linux

Bind multiple NICs using nmcli commands in Linux

Today, let's take a look at how to bind a NIC with nmcli (Network Manager Command Line Interface: Network Management Command Line Interface) in CentOS 7.x.

Nic (Interface) binding is a way to logically connect multiple NICs to allow failover or improve throughput. One way to improve server network availability is to use multiple NICs. Linux driver binding provides a way to aggregate multiple NICs into a logical binding interface. This is a new method for implementing binding, and does not affect the old binding driver in the linux kernel.

Nic binding provides two main benefits:

1. High bandwidth
2. Redundancy/Elasticity

Now let's configure Nic binding on CentOS 7. We need to decide which interfaces to configure as a Team interface ).

Run the ip link command to view available interfaces in the system.

1. $ ip link

Here we use eno16777736 and eno33554960 NICs to create a group interface in active backup mode. (Note: For details about different modes, refer to seven bond modes of multiple NICs)

Use the nmcli command to create a connection for the Network Group interface according to the following syntax.

1. # nmcli con add type team con-name CNAME ifname INAME [config JSON]

CNAME indicates the connection name. INAME is the interface name. JSON (JavaScript Object Notation) specifies the runner used ). The JSON syntax format is as follows:

1. '{"runner":{"name":"METHOD"}}'

METHOD is one of the following: broadcast, activebackup, roundrobin, loadbalance, or lacp.

 

1. Create a group Interface

Now let's create a group interface. This is the command used to create a group interface.

1. # nmcli con add type team con-name team0 ifname team0 config '{"runner":{"name":"activebackup"}}'

Run the # nmcli con show command to verify the configuration of the group interface.

1. # nmcli con show

 

2. Add a Slave Device

Now let's add team0 from the device to the master device. Here is the syntax for adding a slave device:

1. # nmcli con add type team-slave con-name CNAME ifname INAME master TEAM

Here we add eno16777736 and eno33554960 as the slave device of the team0 interface.

1. # nmcli con add type team-slave con-name team0-port1 ifname eno16777736 master team0
2. # nmcli con add type team-slave con-name team0-port2 ifname eno33554960 master team0

Run the # nmcli con show command again to verify the connection configuration. Now we can see the device configuration information.

1. #nmcli con show

 

3. assign an IP address

The above command will create the required configuration file in the/etc/sysconfig/network-scripts/directory.

Now let's assign an IP address for the team0 interface and enable this connection. This is the command for IP Address allocation.

1. # nmcli con mod team0 ipv4.addresses "192.168.1.24/24 192.168.1.1"
2. # nmcli con mod team0 ipv4.method manual
3. # nmcli con up team0

 

4. Verify binding

Run the # ip add show team0 command to verify the IP address information.

1. #ip add show team0

Now, use the teamdctl command to check the active backup configuration function.

1. # teamdctl team0 state

Now let's disconnect the activated port and check the status again to check whether the active backup configuration works as expected.

1. # nmcli dev dis eno33554960

Disconnect the activation port and run the command # teamdctl team0 state again to check the status.

1. # teamdctl team0 state

Yes, it runs well !! We will use the following command to connect back to the disconnected connection of team0.

1. #nmcli dev con eno33554960

We also have a teamnl command to display some options of the teamnl command.

Run the following command to check the port running on team0.

1. # teamnl team0 ports

Display the active port of team0.

1. # teamnl team0 getoption activeport

Okay, we have successfully configured the NIC binding :-). If you have any feedback, please let us know.

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