Introduction
Aruba HPE 8100 switches provide advanced security controls that allow administrators to restrict SSH access to specific IPv4 addresses. Using the SSH server allow-list feature, organizations can ensure that only trusted management servers and authorized administrators are permitted to establish SSH sessions.
This feature enhances security by reducing unauthorized access attempts and helps organizations meet compliance and audit requirements. While Aruba switches allow administrators to configure and verify the allow list through the CLI, there is currently no native GUI option to export the allow list directly into a spreadsheet format.
Configuring SSH Server Access with Allow List
In enterprise environments, restricting SSH access to specific IP addresses is a recommended security practice. The following example demonstrates how to configure an SSH server allow list on an Aruba HPE 8100 switch.
Step 1 – Enter Configuration Mode
configure
Enter global configuration mode to begin making changes to the switch configuration.
Step 2 – Access the SSH Server Allow List Context
ssh server allow-list
This command opens the SSH allow-list configuration context where authorized IP addresses can be defined.
Step 3 – Add Authorized IPv4 Addresses
ip x.x.x.x ip x.x.x.x
Replace the sample IP addresses with the actual management servers or administrator workstations that require SSH access to the switch.
Step 4 – Enable the Allow List
enable Active SSH sessions will be terminated Do you want to continue (y/n)? y
Once enabled, only the configured IP addresses will be allowed to establish SSH connections. Existing SSH sessions may be terminated during activation.
Step 5 – Verify the Configuration
Use the show command within the SSH allow-list context to verify the configured entries.
show
Example output:
SSH Server Allow-List Configuration Enabled: yes Allowed IPv4 Addresses: x.x.x.x x.x.x.x
How the SSH Allow List Works
Once configured and enabled, the SSH server allow list acts as an access control mechanism for inbound SSH connections. Only IP addresses explicitly defined in the allow list can establish secure management sessions with the switch.
The feature automatically enforces the following controls:
- Authorized Access: Only approved IP addresses are permitted.
- Connection Filtering: Unauthorized SSH connection attempts are blocked immediately.
- Audit Readiness: Configuration details can be documented and reviewed during compliance audits.
- Centralized Control: Administrators can easily manage approved management stations.
Example Verification Output
| IPv4 Address | Status |
|---|---|
| x.x.x.x | Enabled |
| x.x.x.x | Enabled |
Benefits of Restricting SSH Access
Implementing an SSH server allow list provides multiple security and operational advantages for enterprise networks.
- Enhanced security by limiting SSH access to trusted IP addresses.
- Supports compliance and audit requirements.
- Ensures only designated administrators can manage critical infrastructure.
- Reduces the attack surface exposed to external threats.
- Provides better visibility into authorized management systems.
- Simplifies security reviews and access control validation.
Troubleshooting SSH Allow List Issues
If SSH connectivity issues occur after implementing the allow list, verify the following items:
- Confirm the correct IP addresses have been configured.
- Verify the allow list is enabled.
- Test SSH access from approved management hosts.
- Attempt access from non-authorized IP addresses to confirm enforcement.
- Review system logs for denied connections or configuration errors.
- Restart the SSH service if configuration changes do not take effect immediately.
Firmware Compatibility
The SSH server allow-list feature is supported across Aruba HPE switch models running firmware version LL.10.12.0006 and later. Administrators should verify software versions before deployment to ensure full feature compatibility.
Using firmware versions older than LL.10.12.0006 may result in unsupported commands or limited functionality.
Conclusion
Configuring an SSH server allow list on Aruba HPE 8100 switches is a simple yet highly effective method for securing administrative access. By allowing connections only from trusted management systems, organizations can significantly reduce the risk of unauthorized access while strengthening compliance and operational security.
Combined with regular auditing, logging, and access reviews, the SSH allow-list feature helps create a more secure and controlled network management environment.
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