cnos-vlag-2tier-spine
Ansible Role: cnos-vlag-2tier-spine - Multiple Layer vLAG Spine Configuration
This is a template driven playbook for a multiple layer vLAG configuration. The role applies to the vLAG peers. The vLAG peers are set up as two pairs that are connected with each other in a North-South orientation. These switches will be referred to as spine switches.
The templates used in this configuration example are different for North and South spine switches. They will be used to configure the spine switches. To separate between North and South spine switches, a condition flag that specifies this will be present in the /etc/anisble/hosts file. The templates will be executed with different settings for the peer IP configuration that are suitable to each spine switch. The peer IP has to be specified for each spine switch in the /etc/anisble/hosts file with the tag ID peerip. Since there are two pairs of spine switches, there will be two sets of values used in the templates.
The configuration commands and their results can be verified in the commands and results directories.
For more details, see Configuring a multiple layer vLAG network.
Requirements
- Ansible version 2.3 or later (Ansible installation documentation)
- Lenovo switches running CNOS version 10.2.1.0 or later
- an SSH connection to the Lenovo switch (SSH must be enabled on the network device)
Role Variables
The following are mandatory inventory variables:
| Variable | Description |
|---|---|
ansible_connection |
Has to be network_cli |
ansible_network_os |
Has to be enos |
ansible_ssh_user |
Specifies the username used to log into the switch |
ansible_ssh_pass |
Specifies the password used to log into the switch |
The values of the variables used need to be modified to fit the specific scenario in which you are deploying the solution. To change the values of the variables, you need to visits the vars directory of each role and edit the main.yml file located there. The values stored in this file will be used by Ansible when the template is executed.
The syntax of main.yml file for variables is the following:
<template variable>:<value>
You will need to replace the <value> field with the value that suits your topology. The <template variable> fields are taken from the template and it is recommended that you leave them unchanged.
Available variables are listed below, along with description:
| Variable | Description |
|---|---|
username |
Specifies the username used to log into the switch |
password |
Specifies the password used to log into the switch |
flag |
Configures the condition flag associated with the switch |
slot_chassis_number1 |
Specifies the ethernet port (slot number/port number) |
portchannel_interface_number1 |
Specifies the LAG number (1-4096) |
portchannel_mode1 |
Configures the LAG type (on - static LAG, active - active member of a LACP LAG, passive - passive member of a LACP LAG) |
slot_chassis_number2 |
Specifies the ethernet port (slot number/port number) |
portchannel_interface_number2 |
Specifies the LAG number (1-4096) |
slot_chassis_number3 |
Specifies the ethernet port (slot number/port number) |
portchannel_interface_number3 |
Specifies the LAG number (1-4096) |
slot_chassis_number4 |
Specifies the ethernet port (slot number/port number) |
portchannel_interface_number4 |
Specifies the LAG number (1-4096) |
switchport_mode1 |
Configures the switch port mode (access - the port can be part of only a single VLAN, trunk - the port can be part of any number of VLANs) |
slot_chassis_number5 |
Specifies the ethernet port (slot number/port number) |
stp_mode1 |
Configures the STP mode (mst - MSTP, rapid-pvst - Rapid PVST+, disable - STP is disabled) |
vlag_tier_id1 |
Configure the vLAG tier ID (1-512) |
vlag_instance_number1 |
Configure the vLAG instance (1-64) |
vlag_instance_number2 |
Configure the vLAG instance (1-64) |
vlag_instance_number3 |
Configure the vLAG instance (1-64) |
Dependencies
- username.iptables - Configures the firewall and blocks all ports except those needed for web server and SSH access.
- username.common - Performs common server configuration.
- /etc/ansible/hosts - You must edit the /etc/ansible/hosts file with the device information of the switches designated as spine switches. You may refer to cnos-vlag-2tier-spine-hosts for a sample configuration.
Ansible keeps track of all network elements that it manages through a hosts file. Before the execution of a playbook, the hosts file must be set up.
Open the /etc/ansible/hosts file with root privileges. Most of the file is commented out by using #. You can also comment out the entries you will be adding by using #. You need to copy the content of the hosts file for the role into the /etc/ansible/hosts file. The sample hosts file for the role is located in the main directory.
[cnos-vlag-2tier-spine]
10.240.178.76 ansible_network_os=cnos ansible_ssh_user=<username> ansible_ssh_pass=<password> deviceType=g8272_cnos condition=north peerip=10.240.178.77
10.240.178.77 ansible_network_os=cnos ansible_ssh_user=<username> ansible_ssh_pass=<password> deviceType=g8272_cnos condition=north peerip=10.240.178.76
10.240.178.78 ansible_network_os=cnos ansible_ssh_user=<username> ansible_ssh_pass=<password> deviceType=g8272_cnos condition=south peerip=10.240.178.79
10.240.178.79 ansible_network_os=cnos ansible_ssh_user=<username> ansible_ssh_pass=<password> deviceType=g8272_cnos condition=south peerip=10.240.178.78
Note: You need to change the IP addresses, including the IP addresses of the vLAG peers, to fit your specific topology. You also need to change the <username> and <password> to the appropriate values used to log into the specific Lenovo network devices.
Example Playbook
To execute an Ansible playbook, use the following command:
ansible-playbook cnos-vlag-2tier-spine.yml -vvv
-vvv is an optional verbos command that helps identify what is happening during playbook execution. The playbook for each role of the multiple layer vLAG configuration solution is located in the main directory of the solution.
- hosts: cnos-vlag-2tier-spine
roles:
- cnos-vlag-2tier-spine
License
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
The cnos-vlag-2tier_spine role facilitates the configuration of the spine switches in the PoD for VLAG in a Tier 2 fabric for switches running Lenovo's CNOS operating system.
ansible-galaxy install lenovo/ansible-role-cnos-vlag-2tier-spine