Ansible on Arista EOS 4.33 Automation Complete Guide

Arista EOS 4.33 is a current 4.33.x train running on 7050X/7280R/7500R/7800R series switches. Ansible's arista.eos collection plus the Arista Validated Designs (AVD) roles drive day-0 EVPN-VXLAN fabrics, MLAG, OSPF/BGP, and CloudVision (CVP) integration. This is the master Ansible guide for EOS 4.33.

Arista EOS 4.33 release facts

| Item | Value | |---|---| | Train | 4.33.x | | Programmability | eAPI (REST/JSON-RPC), gNMI, OpenConfig YANG | | Validated automation | Arista Validated Designs (AVD) | | Telemetry | TerminAttr/CVP |

See also: Ansible on Cisco NX-OS 10.4 Automation Complete Guide

Ansible-core compatibility

Use ansible-core 2.18 LTS with arista.eos >= 9.0 and AVD ≥ 5.0 roles via arista.avd.

Inventory

[eos]
spine01 ansible_host=10.20.0.1
spine02 ansible_host=10.20.0.2
leaf01 ansible_host=10.20.0.10
leaf02 ansible_host=10.20.0.11
[eos:vars]
ansible_network_os=arista.eos.eos
ansible_connection=ansible.netcommon.httpapi
ansible_httpapi_use_ssl=true
ansible_httpapi_validate_certs=false
ansible_user=admin
ansible_password='{{ vault_eos_password }}'

See also: Ansible on SONiC Automation Complete Guide

Backup running-config

- name: Backup EOS configs
  hosts: eos
  gather_facts: false
  tasks:
    - name: Save running-config
      arista.eos.eos_config:
        backup: true
        backup_options:
          dir_path: ./backups

OSPF underlay

- name: OSPFv2 underlay
  hosts: eos
  gather_facts: false
  tasks:
    - name: OSPF
      arista.eos.eos_ospfv2:
        config:
          processes:
            - process_id: 1
              router_id: "{{ rid }}"
              areas:
                - area_id: '0.0.0.0'
        state: merged

See also: Ansible AWS: Complete Guide to Cloud Automation (2026)

MLAG

- name: MLAG between leaf01/leaf02
  hosts: leaf01:leaf02
  gather_facts: false
  tasks:
    - name: MLAG config
      arista.eos.eos_config:
        lines:
          - mlag configuration
          - domain-id mlag1
          - local-interface Vlan4094
          - peer-address 10.0.0.{{ peer_id }}
          - peer-link Port-Channel999

EVPN-VXLAN with AVD

group_vars/EVPN_FABRIC.yml:

fabric_name: dc1
underlay_routing_protocol: ebgp
overlay_routing_protocol: ebgp
local_users:
  - name: admin
    privilege: 15
    role: network-admin
    sha512_password: "{{ vault_admin_sha512 }}"

Playbook:

- name: Build EVPN fabric with AVD
  hosts: EVPN_FABRIC
  gather_facts: false
  tasks:
    - import_role: { name: arista.avd.eos_designs }
    - import_role: { name: arista.avd.eos_cli_config_gen }
    - import_role: { name: arista.avd.eos_config_deploy_eapi }

CloudVision (CVP) integration

- name: Push configs through CVP
  hosts: localhost
  tasks:
    - name: Apply configlets via CVP
      arista.cvp.cv_configlet_v3:
        configlets:
          spine01: "{{ lookup('ansible.builtin.file', 'intended/spine01.cfg') }}"
        state: present

Drift detection

- name: Drift check on EOS
  hosts: eos
  gather_facts: false
  tasks:
    - name: Compare to intended
      arista.eos.eos_config:
        src: "intended/{{ inventory_hostname }}.cfg"
        diff_against: intended
      register: drift

Best practices

• Adopt AVD over hand-written templates — it encodes Arista's reference designs and validates inputs. • Use eAPI (httpapi) transport for performance; SSH is fallback. • Push through CVP for change management and audit when available. • Combine drift detection with TerminAttr telemetry to alert on out-of-band changes.

Conclusion

EOS 4.33 with arista.eos and the AVD framework gives the most opinionated, deterministic networking automation experience available today. Ansible orchestrates AVD inputs and CVP delivery for production-grade fabric rollouts.