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Interlude 2: Lab Configuration

The virtual lab as set up in homework 1 enables just the interfaces used for out-of-band management. These interfaces are connected to a Linux bridge without CDP support. As a result every router sees all other routers via CDP in the OOB interface. Since all physical router interfaces are administratively down by default, the connectivity graph shows just full mesh connectivity between the OOB interfaces and nothing more. That is not the intended result for the topology visualization.

Thus I have written two playbooks to add some configuration to the virtual network:

  1. The playbook no_oob_mgmt_cdp.yml disables CDP on the OOB interfaces, because I do not want to see this in the topology graph. The OOB interfaces are intended for staging only, they are not part of the production configuration. This is a simple playbook, because just one command (no cdp enable) needs to be configured on the same interface (FastEthernet0/0) of all routers. This is done with just one task invoking the ios_config module in the single play of the playbook.
  2. The playbook configure_interfaces.yml enables the transit interfaces between the routers, and additionally configures IPv4 addresses on transit and loopback interfaces. (The IPv4 addresses are not used yet.) This playbook is a bit more complex than the other. It reads a YAML file containing node descriptions, uses a Jinja2 template to generate configuration snippets, and then uses the generated configuration as input to the ios_config Ansible module.

BNAS2018 Homework 2 | BNAS2018 GitHub repository | My GitHub user page | My home page