Configure link aggregation in active and standby mode using nmcli

Link aggregation in active and standby mode places one of the interfaces in a backup state and makes it active only if the active interface is disconnected.

Now let's configure the network card binding in CentOS 7 and run the ip link command to see which network cards can be used.

[root@localhost ~] # ip link1: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00100 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 08: enp0s3: mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:7b:d3:32 brd ff:ff:ff:ff:ff:ff3: enp0s8: mtu 1500 : 00:27:81:d3:be brd ff:ff:ff:ff:ff:ff

Here, enp0s3 and enp0s8 network cards are used to configure link aggregation in active and standby mode.

Create Team interface [root@localhost ~] # nmcli connection add type team con-name team0 ifname team0 config'{"runner": {"name": "activebackup"}} 'Connection' team0' (4df78635-b9fc-4539-ab02-27db11c656fe) successfully added.

Run nmcli con show to view the configuration of team0

[root@localhost] # nmcli con showNAME UUID TYPE DEVICE team0 4df78635-b9fc-4539-ab02-27db11c656fe team team0 enp0s3 5005942f-a7fd-4e55-b8e7-77928d8da72d ethernet enp0s3 Wired connection 1 45dee64a-53b3-3e2a-b2d4-e377f3e668a2 ethernet enp0s8

Add Slave Interfac

Here, enp0s3 and enp0s8 network cards are used as the slave interfaces of team0:

[root@localhost] # nmcli connection add type team-slave con-name team0-port1 ifname enp0s3 master team0Connection 'team0-port1' (15183c4a-2053-4b53-ad58-de5a07ae3ae9) successfully added. [root@localhost ~] # nmcli connection add type team-slave con-name team0-port2 ifname enp0s8 master team0Connection' team0-port2' (a34e20b0-3422-46e5-a947-bb2eaa6c0622) successfully added.

View port configuration information:

[root@localhost] # nmcli connection show NAME UUID TYPE DEVICE team0 4df78635-b9fc-4539-ab02-27db11c656fe team team0 enp0s3 5005942f-a7fd-4e55-b8e7-77928d8da72d ethernet enp0s3 Wired connection 1 45dee64a-53b3-3e2a-b2d4-e377f3e668a2 ethernet enp0s8 team0-port1 15183c4a-2053-4b53-ad58-de5a07ae3ae9 ethernet-- team0-port2 A34e20b0-3422-46e5-a947-bb2eaa6c0622 ethernet-

Assign IP addr

Assign a static IP address to team0 and start the team0 configuration:

[root@localhost ~] # nmcli connection modify team0 ipv4.method manual ipv4.addresses 192.168.0.200 24 ipv4.gateway 192.168.0.1 ipv4.dns 202.102.128.68 [root@localhost] # nmcli connection up team0 Connection successfully activated (master waiting for slaves) (D-Bus active path: / org/freedesktop/NetworkManager/ActiveConnection/4)

Check the connection configuration information and find that team0-port1 is not bound to enp0s3, a network card interface.

[root@localhost ~] # nmcli connection

This is within the ifcfg-team0-port1 configuration file and ifcfg-enp0s3 configuration files are set to boot

So we need to turn off the boot of enp0s3. Here we turn off the boot of both enp0s3 and Wired connection 1.

[root@localhost ~] # nmcli connection modify enp0s3 autoconnect no [root@localhost ~] # nmcli connection modify Wired\ connection\ 1 autoconnect no

Then restart the network service to view the link configuration:

[root@localhost ~] # systemctl restart network [root@localhost ~] # nmcli connection [root@localhost ~] # ip ad

You can see that both team0-port1 and team0-port2 are bound to the corresponding network card. The ip address of team0 shows 192.168.0.200 set manually.

Verification

View the status of team0:

[root@localhost ~] # teamdctl team0 statesetup: runner: activebackupports: enp0s3 link watches: link summary: up instance [link _ watch_0]: name: ethtool link: up down count: 0 enp0s8 link watches: link summary: up instance [link _ watch_0]: name: ethtool link: up down count: 0runner: active port: enp0s8

Now the active port is enp0s8. Let's disconnect this port to see if the active / standby mode configuration is working:

[root@localhost ~] # nmcli device disconnect enp0s8 Device 'enp0s8' successfully disconnected. [root@localhost ~] # teamdctl team0 statesetup: runner: activebackupports: enp0s3 link watches: link summary: up instance [link _ watch_0]: name: ethtool link: up down count: 0runner: active port: enp0s3

See that the active interface is switched to enp0s3.

Summary

Link aggregation in active and standby mode places one of the interfaces in a backup state and makes it active only if the active interface is disconnected.

Original address: https://www.linuxprobe.com/nmcli-team-port.html