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# How to create link aggregation
:::{note}
These instructions assume a system setup based on the example configuration outlined in the [Netplan tutorial](/netplan-tutorial).
:::
Let's suppose now that you need to configure your system to connect to your
ISP links via a link aggregation. On Linux you can do that with a `bond`
virtual interface.
On Netplan, an interface of type `bond` can be created inside a `bonds` mapping.
Now that the traffic will flow through the link aggregation, you will move
all the addressing configuration to the bond itself.
You can define a list of interfaces that will be attached to the bond. In our
simple scenario, we have a single one.
Edit the file `/etc/netplan/second-interface.yaml` and make the following changes:
```yaml
network:
version: 2
ethernets:
netplan-isp-interface:
dhcp4: false
dhcp6: false
match:
macaddress: 00:16:3e:0c:97:8a
set-name: netplan-isp
bonds:
isp-bond0:
interfaces:
- netplan-isp-interface
dhcp4: false
dhcp6: false
accept-ra: false
link-local: []
addresses:
- 172.16.0.1/24
routes:
- to: default
via: 172.16.0.254
nameservers:
search:
- netplanlab.local
addresses:
- 172.16.0.254
- 172.16.0.253
```
Note that you can reference the interface used in the bond by the name you
defined for it in the `ethernets` section.
Now use `netplan apply` to apply your changes
```
netplan apply
```
Now your system has a new interface called `isp-bond0`. Use the command
`ip address show isp-bond0` or `netplan status` to check its state:
```
netplan status isp-bond0
```
You should see an output similar to the one below:
```
Online state: online
DNS Addresses: 127.0.0.53 (stub)
DNS Search: lxd
netplanlab.local
● 4: isp-bond0 bond UP (networkd: isp-bond0)
MAC Address: b2:6b:19:b1:9a:86
Addresses: 172.16.0.1/24
DNS Addresses: 172.16.0.254
172.16.0.253
DNS Search: netplanlab.local
Routes: default via 172.16.0.254 (static)
172.16.0.0/24 from 172.16.0.1 (link)
3 inactive interfaces hidden. Use "--all" to show all.
```
|
