The integration of Ansible into the management of Brocade storage networking and Ruckus ICX switching environments represents a critical shift from manual Command Line Interface (CLI) administration to an infrastructure-as-code (IaC) paradigm. In high-density SAN (Storage Area Network) environments, the use of Fabric OS (FOS) requires precise control over zoning, alias creation, and firmware management. Similarly, the deployment of network automation across ICX switches necessitates a deep understanding of the underlying transport protocols and the specific module behaviors associated with the ansible.netcommon.network_cli connection type. Achieving a stable automation pipeline requires the alignment of security certificates, the correct configuration of HTTP/HTTPS listeners on the hardware, and the precise handling of privilege escalation during the session establishment phase.
Technical Architecture of Brocade FOS Automation
The automation of Brocade switches primarily relies on the brocade.fos collection and the dedicated FOS Command Module. These tools provide a programmatic interface to execute FOS commands, allowing engineers to move away from artisanal configuration and toward scalable, repeatable deployments.
The FOS Command Module Functional Mechanism
The FOS Command Module for Ansible serves as the primary mechanism for executing arbitrary FOS commands via an Ansible task. Instead of relying solely on raw SSH scripts, this module provides a structured way to push commands to the switch and retrieve the resulting output.
The operational flow of the FOS Command Module involves several layers:
- Command Dispatch: The Ansible controller sends a specific FOS command string to the target switch.
- Execution Layer: The switch processes the command within the FOS environment.
- Response Handling: The module captures the output and returns it to the Ansible controller as a JSON object.
This mechanism is essential for tasks that are not covered by specific zoning modules, such as diagnostic checks or the execution of custom scripts on the switch.
Version Compatibility and the FOS v8.2.1C Discrepancy
A significant challenge in Brocade automation is the variance in behavior between different versions of Fabric OS. While the brocade.fos collection is fully compatible with newer versions, such as FOS 9.x, issues frequently arise when targeting older legacy hardware running FOS v8.2.1C.
One documented failure mode involves a 301 Moved Permanently error returned during a POST request. This error indicates a protocol mismatch or a redirection requirement. Specifically, the error {"POST_resp_code": 301, "POST_resp_data": "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>301 Moved Permanently</title>\n</head><body>\n<h1>Moved Permanently</h1> suggests that the Ansible controller is attempting to communicate via a protocol or port that the switch is redirecting, typically from HTTP to HTTPS.
Protocol Security and HTTPS Certificate Management
The transition from FOS 9.x to FOS v8.2.1C often exposes underlying security configuration gaps, particularly regarding the REST API and web management interfaces.
The HTTP to HTTPS Redirection Conflict
When the brocade.fos collection attempts to connect to a switch, it may encounter a scenario where HTTP is disabled or forced to redirect to HTTPS. This is evidenced by the error message: . Please use HTTPS.</error-message> <error-info> <error-code>48</error-code> <error-module>rest</error-module> </error-info>.
This error occurs because: 1. The switch has a security policy that forbids unencrypted HTTP traffic. 2. The Ansible module is attempting a connection that triggers the switch's internal redirect mechanism. 3. The REST module on the switch is explicitly rejecting the request with error code 48.
Certificate Resolution and Workarounds
The resolution of this connectivity issue involves two primary paths: ensuring the presence of a valid HTTPS certificate or temporarily disabling the certificate requirement to restore connectivity.
- Certificate Validation: The switch must have a valid HTTPS certificate installed to facilitate secure communication with the Ansible controller.
- Certificate Deletion: In scenarios where a deployment is stalled and immediate recovery is required, deleting the existing certificate on the switch can sometimes restore functionality by resetting the security state.
- Switch-Side Configuration: It is imperative to verify if HTTP is explicitly allowed on the switch side. If the switch is configured to only allow HTTPS, any Ansible task attempting to use HTTP will fail with a 301 redirect or a REST error.
Troubleshooting Ruckus ICX Automation Failures
Network automation for ICX switches using the icx_command module introduces a different set of challenges, primarily revolving around CLI prompt handling and privilege escalation.
Analysis of the ICX Command Failure
When utilizing the icx_command module, users have reported failures where the module returns an "Invalid input" message. For example, a playbook attempting to run show version may result in:
FAILED! => {“changed”: false, “msg”: “skip\r\nInvalid input → skip\r\nType ? for a list\r\nSSH@ICX7250-24P Switch>”}.
This failure typically stems from the module sending a command that the switch does not recognize in its current state, or the module failing to correctly identify the prompt, leading to the injection of characters (like "skip") that are not valid FOS/ICX commands.
Privilege Escalation and the Become Process
A critical failure point in ICX automation is the transition to "enable" mode. Using ansible_become to elevate privileges often results in a timeout error:
FAILED! => {“changed”: false, “msg”: “unable to elevate privilege to enable mode, at prompt [None] with error: timeout value 60 seconds reached while trying to send command: b’enable’”}.
The technical implications of this error include:
1. Prompt Mismatch: The module is unable to find the expected prompt to which it should send the enable command.
2. Byte-String Encoding: The appearance of b'enable' indicates that the command is being sent as a byte string, which is standard for the network_cli connection but can be problematic if the switch is not responding to the exact string sequence expected by the module.
3. Timeout Threshold: The 60-second timeout is reached because the switch never returns the expected "Password:" or "Enable" prompt, causing the Ansible process to hang and then fail.
Configuration Specifications for Network Automation
The following table outlines the required parameters for configuring Ansible to communicate with Brocade and ICX devices based on the observed technical requirements.
| Parameter | Value/Requirement | Purpose |
|---|---|---|
| ansible_connection | ansible.netcommon.network_cli | Establishes the CLI-based transport layer |
| ansiblenetworkos | icx | Specifies the target operating system for ICX modules |
| ansible_user | [username] | Authentication identity for the switch |
| ansible_password | [password] | Authentication secret for the switch |
| FOS Version | 9.x / 8.2.1C | Determines the compatibility of the brocade.fos collection |
| Protocol | HTTPS (Required for REST) | Ensures encrypted communication and avoids 301 errors |
| Collection | brocade.fos | Provides zoning and alias management capabilities |
Implementation Workflow for Brocade Zoning
For engineers deploying zoning and aliases via the brocade.fos collection, the following procedural steps are required to ensure a successful deployment.
- Define the target host group in the inventory.
- Ensure the
brocade_zoninggather_subset is utilized to pull existing configuration data. - Configure the credentials using the
{{ credential }}variable to maintain security. - Verify that the target switch is running a supported FOS version.
- If using FOS v8.2.1C, verify that HTTPS is enabled and that a valid certificate is installed to prevent REST API errors.
Comparative Analysis of Connectivity Failures
The distinction between the failures in Brocade FOS (Storage) and ICX (Networking) is significant.
1 Brocade FOS Failures: These are primarily API-driven. The failures (301 Moved Permanently, Error 48) occur at the HTTP/HTTPS layer. The solution is administrative (certificate management) and protocol-based (switching to HTTPS).
2 ICX Failures: These are primarily CLI-driven. The failures (Invalid input, timeout during enable) occur at the SSH/TTY layer. The solution involves refining the network_cli behavior and ensuring the prompt matching logic in the icx_command module aligns with the actual switch output.
Conclusion
The automation of Brocade and Ruckus ICX environments via Ansible is a powerful but sensitive operation. The evidence suggests that while the brocade.fos collection is robust for modern FOS 9.x deployments, legacy versions like v8.2.1C introduce complexities regarding HTTPS enforcement and REST API availability. The 301 Moved Permanently error is a definitive indicator of a protocol mismatch that must be resolved by either installing valid certificates or verifying the HTTP/HTTPS status on the switch. Simultaneously, ICX automation reveals weaknesses in the network_cli interaction, specifically regarding privilege escalation and prompt recognition. For a successful deployment, administrators must prioritize the alignment of the switch's security posture (certificates and ports) with the Ansible controller's connection requirements and ensure that the ansible_become process is correctly mapped to the switch's specific CLI prompts to avoid timeouts.