You want to learn how to setup LACP in Ubuntu 18.04/20.04? Take a look!

Intro:

I was struggling with the new netplan configuration options under Ubuntu 18.04 LTS or Ubuntu 20.04.1 LTS. In this post I will you will find to production ready configurationexamples. The first with simple LACP and the second with a bit advanced + VLAN on bond. I hope this configuration will help you guys. Works for me like a charm.

The first thing to learn is how to set interfaces up and down

ip a
ip link set INTERFACE_NAME up
ip link set INTERFACE_NAME down

to configure a basic LACP in Ubuntu 18.04 or 20.04 you can use this configuration. Just adjust it for your needs:

sudo vim /etc/netplan/01-lacp.yaml
network:
  ethernets:
    eno1:
      dhcp4: true
    switchports:
      match: eno* # for example if your interfaces are named with eno1np0 and eno2np1
  version: 2
 
  bonds:
    bond0:
      dhcp4: false
      addresses:
        - 192.168.1.3/24
      interfaces:
        - switchports
      parameters:
        mode: 802.3ad
        mii-monitor-interval: 5
        lacp-rate: slow
        min-links: 1

or if you want to setup a VLAN too here or close to production configuration:

network:
  bonds:
    bond0:
      addresses:
        192.168.1.5/24 # Server-IP
      gateway4: 192.168.1.1 # Gateway or Router IP
      interfaces: # Interfaces for LACP / Bonding
        eno1np0
	eno2np1
      nameservers:
        addresses:
	  - 192.168.1.2 # first nameserver
	  - 192.168.1.3 # second nameserver
	search:
	  - YOUR.LOCAL.DOMAIN # If you needed
	parameters:
          lacp-rate: fast
	  mode: 802.3ad
	  transmit-hash-policy: layer2
  ethernets:
    eno1np0: {}
    eno2np1: {}
  version: 2
  vlans:
    bond0.455:
      addresses:
      - 10.59.0.1/24
      id: 455
      link: bond0
      nameservers:
        addresses: []
	search: []

To apply the changes you have to enter sudo netplan apply but double check the configuration. In the worst case you will be disconnected from your SSH session or disconnecting the server from your network!