Ansible – Config Generator – I

Before proceeding, make sure to install “netaddr” as this is required for “ipaddr()” used in the Jinja2 configuration template.

pip install netaddr

aggr.yml is the playbook that will be utilized for generating L3 SVI configuration:

---
- hosts: local
  connection: local
  gather_facts: no

tasks:
- name: GENERATE CONFIG
  template:
  src: ./SVI.j2
  dest: ./{{ item.vlan }}.conf
  with_items:
  - { vrf: NET1, vlan: 502, vlanname: VLAN-502-NAME, net: 10.80.120.128/29 }
  - { vrf: NET1, vlan: 503, vlanname: VLAN-503-NAME, net: 10.80.120.136/29 }

This is the SVI.j2 Jinja2 template that is being utilized to generate the final configuration:

###### A-Side ######
vlan {{ item.vlan }}
 name {{ item.vlanname }}

interface Vlan {{ item.vlan }}
 description {{ item.vlanname }}
 mtu 9100
 vrf member {{ item.vrf }}
 no ip redirects
 ip address {{ item.net | ipaddr('2') }}
 hsrp version 2
 hsrp 1
 authentication md5 key-string password{{ item.vlan }}
 preempt delay minimum 120
 priority 120
 timers 1 3
 ip {{ item.net | ipaddr('1') | ipaddr('address') }}

###### B-Side ######
vlan {{ item.vlan }}
 name {{ item.vlanname }}

interface Vlan {{ item.vlan }}
 description {{ item.vlanname }}
 mtu 9100
 vrf member {{ item.vrf }}
 no ip redirects
 ip address {{ item.net | ipaddr('3') }}
 hsrp version 2
 hsrp 1
 authentication md5 key-string password{{ item.vlan }}
 preempt delay minimum 120
 priority 110
 timers 1 3
 ip {{ item.net | ipaddr('1') | ipaddr('address') }}

In my setup, the play-book (aggr.yml), source template SVI.j2 file and the destination file exist in the same folder.

Reference Github.

6 Replies to “Ansible – Config Generator – I”

  1. There aren’t specific documents. I read the official ansible docs and was able to work on something based on other blogs that I read. Most of ansible tutorial tends to be for server guys and not network guys.

Leave a Reply