Ansible Role: cnos-clos-spine - Clos Spine BGP Configuration

The configuration of the two spine switches in the PoD for BGP in the Clos network consist of common variables that apply to all spine switches and unique variables that apply to a specific spine switch. Therefore multiple templates must be used on the spine switches.

For more details, see Configuring a Clos Network using Ansible.

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

Available variables are listed below, along with description.

The following are mandatory inventory variables:

Variable	Description
`ansible_connection`	Has to be `network_cli`
`ansible_network_os`	Has to be `cnos`
`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:

Common Variables	Description
`username`	Specifies the username used to log into the switch
`password`	Specifies the password used to log into the switch
`hostname`	Specifies the hostname of the switch to connect to
`stpmode`	Configures the STP mode (mst - MSTP, rapid-pvst - Rapid PVST+, disable - STP is disabled) for all spine switches
`stpmst`	STP MST value for all spine switches

Switch-specific Variables	Description
`flag`	Conditional flag specifying which spine switch the unique variables should be applied to
`spine_to_leaf1_interface1`	Specifies the first ethernet port (slot number/port number) connected to leaf switch 1
`spine_to_leaf1_description1`	Configures the description of the first port connected to leaf switch 1 (maximum of 80 characters)
`spine_to_leaf1_ip1`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the first port connected to leaf switch 1
`spine_to_leaf1_interface2`	Specifies the second ethernet port (slot number/port number) connected to leaf switch 1
`spine_to_leaf1_description2`	Configures the description of the second port connected to leaf switch 1 (maximum of 80 characters)
`spine_to_leaf1_ip2`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the second port connected to leaf switch 1
`spine_to_leaf2_interface1`	Specifies the first ethernet port (slot number/port number) connected to leaf switch 2
`spine_to_leaf2_description1`	Configures the description of the first port connected to leaf switch 2 (maximum of 80 characters)
`spine_to_leaf2_ip1`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the first port connected to leaf switch 2
`spine_to_leaf2_interface2`	Specifies the second ethernet port (slot number/port number) connected to leaf switch 2
`spine_to_leaf2_description2`	Configures the description of the second port connected to leaf switch 2 (maximum of 80 characters)
`spine_to_leaf2_ip2`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the second port connected to leaf switch 2
`spine_to_leaf3_interface1`	Specifies the first ethernet port (slot number/port number) connected to leaf switch 3
`spine_to_leaf3_description1`	Configures the description of the first port connected to leaf switch 3 (maximum of 80 characters)
`spine_to_leaf3_ip1`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the first port connected to leaf switch 3
`spine_to_leaf3_interface2`	Specifies the second ethernet port (slot number/port number) connected to leaf switch 3
`spine_to_leaf3_description2`	Configures the description of the second port connected to leaf switch 3 (maximum of 80 characters)
`spine_to_leaf3_ip2`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the second port connected to leaf switch 3
`spine_to_leaf4_interface1`	Specifies the first ethernet port (slot number/port number) connected to leaf switch 4
`spine_to_leaf4_description1`	Configures the description of the first port connected to leaf switch 4 (maximum of 80 characters)
`spine_to_leaf4_ip1`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the first port connected to leaf switch 4
`spine_to_leaf4_interface2`	Specifies the second ethernet port (slot number/port number) connected to leaf switch 4
`spine_to_leaf4_description2`	Configures the description of the second port connected to leaf switch 4 (maximum of 80 characters)
`spine_to_leaf4_ip2`	Configures the IP address (IPv4 or IPV6 address/prefix length) of the second port connected to leaf switch 4
`router_as_number`	Configures the router Autonomous System (AS) Number (1-4294967295)
`router_multipath_number`	Configures the router multipath number
`neighbor_ad_interval`	Configures the neighbor advertisement interval (0-65535 seconds)
`neighbor_address1`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 1 connected to port 1
`neighbor_address2`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 1 connected to port 2
`neighbor_address3`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 2 connected to port 1
`neighbor_address4`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 2 connected to port 2
`neighbor_address5`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 3 connected to port 1
`neighbor_address6`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 3 connected to port 2
`neighbor_address7`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 4 connected to port 1
`neighbor_address8`	Specifies the neighbor IP address (IPv4 or IPV6 address/prefix length) of leaf 4 connected to port 2

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 Clos Spine BGP switches. You may refer to cnos-clos-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-clos-spine]
10.240.175.111   ansible_network_os=cnos ansible_ssh_user=<username> ansible_ssh_pass=<password> deviceType=g8272_cnos
10.240.175.112   ansible_network_os=cnos ansible_ssh_user=<username> ansible_ssh_pass=<password> deviceType=g8272_cnos

Note: You need to change the IP addresses 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-clos-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 Clos network configuration solution is located in the main directory of the solution.

- hosts: cnos-clos-spine
  roles:
    - cnos-clos-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.