How to use nmcli to create / add bridges in Linux

Today, I would like to share with you how to use nmcli to create / add bridges in Linux. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.

How to use nmcli to create / add a bridge the steps to add a bridge interface on Linux using NetworkManager are as follows:

Open the terminal

Get the current connection status: nmcli con show

Add a new bridge: nmcli con add type bridge ifname br0

Create a subnet card: nmcli con add type bridge-slave ifname eno1 master br0

Open br0: nmcli con up br0

Let's look at how to create a bridge called br0 at the level of detail.

To get the current network configuration, you can learn about the local network connection through NetworkManager's GUI:

Getting Network Info on Linux

You can also view it using the following command line:

$nmcli con show $nmcli connection show-- active

View the connections with nmcli

I have a "wired connection" using the network card eno1. My system also has a VPN interface. I'm going to create a bridge called br0 and connect to eno1.

How to create a bridge named br0 $sudo nmcli con add ifname br0 type bridge con-name br0 $sudo nmcli con add type bridge-slave ifname eno1 master br0 $nmcli connection show

Create bridge interface using nmcli on Linux

You can also disable STP:

The last command of $sudo nmcli con modify br0 bridge.stp no $nmcli con show $nmcli-f bridge con show br0 shows the bridge parameters when STP is disabled:

Bridge.mac-address:-- bridge.stp: no bridge.priority: 32768 bridge.forward-delay: 15 bridge.hello-time: 2 bridge.max-age: 20 bridge.ageing-time: 300 bridge.multicast-snooping: how to open a bridge in yes you must first close Wired connection 1 Then open br0:

$sudo nmcli con down "Wired connection 1" $sudo nmcli con up br0 $nmcli con show uses the ip command to view IP information:

$ip a s $ip a s br0

Build a network bridge with nmcli on Linux

Appendix: how to use br0 on KVM now you can use the VM (virtual machine) created by KVM/VirtualBox/VMware workstation to connect directly to the network instead of through NAT. Use the vi or cat command to create a file called br0.xml for the virtual machine:

$cat / tmp/br0.xml add the following code:

Br0 runs the virsh command as follows:

# virsh net-define / tmp/br0.xml # virsh net-start br0 # virsh net-autostart br0 # virsh net-list-- all output:

Name State Autostart Persistent-br0 active yes yes default inactive no yes read the man page for more information:

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