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3. Key Technical Specifications
- Model: CSACS-1121-K9
- Form Factor: 1U rack-mount appliance
- Processor: Intel dual-core (typically Core 2 Duo class, ~2.4 GHz)
- Memory: 4 GB RAM
- Storage: Dual 250 GB SATA hard drives
- Network: Gigabit Ethernet (10/100/1000) interfaces
- Optical Drive: Slimline DVD-ROM (front panel)
- Protocols Supported: RADIUS, TACACS+, PAP, CHAP, MS-CHAP, EAP variants
- Software: Cisco Secure ACS 5.x (runs on Cisco ADE OS)
- Dimensions (approx.): 1.75 in H × 17.3 in W × 22.0 in D
- Weight: Approx. 24–28 lb (11–13 kg)
- Power: Standard dual or single PSU configuration (verify exact unit)
Note: Exact CPU, memory, and drive configurations can vary slightly by manufacturing revision. Always confirm the hardware revision and installed ACS software version.
4. Product Introduction
The Cisco CSACS-1121-K9 is a dedicated 1U appliance that runs Cisco Secure Access Control System (ACS) software. It provides centralized authentication, authorization, and accounting (AAA) services for network devices, users, and endpoints using RADIUS and TACACS+.
Network and security teams deploy or replace this unit when maintaining legacy ACS 5.x environments that have not yet migrated to Cisco ISE. The appliance handles policy enforcement, device administration, and access control for routers, switches, firewalls, and wireless infrastructure. Current availability is limited to New Surplus or fully tested residual stock.
CSACS-1121-K9
CSACS-1121-K9
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Appliance will not power on | Power supply or power cable issue | ✅ High | Check power LEDs and test outlet/PSU | Verify power connections and redundant PSU if equipped |
| Cannot reach web or CLI interface | Network configuration or cable fault | ✅ High | Verify IP settings and test with console access | Use serial console for initial configuration |
| ACS services fail to start | Software corruption or disk issue | ✅ High | Check system logs and disk status via CLI | Review ADE OS logs; consider recovery if needed |
| Authentication requests timeout | RADIUS/TACACS+ configuration or load | ✅ High | Test with known-good client and check CPU/memory | Verify shared secrets, ports, and server load |
| Hard drive failure indicated | Disk health or RAID status | ✅ Medium | Check front-panel LEDs and CLI disk status | Replace failed drive; restore from backup if required |
If the issue persists, collect CLI show commands output, system logs, and ACS version information before contacting support.
6. Frequently Asked Questions (FAQ)
Q: Is the CSACS-1121-K9 still supported by Cisco?
A: No. It is an End-of-Life product. Cisco has migrated customers to Identity Services Engine (ISE). Official software updates and hardware support have ended. Available units are New Surplus or residual stock.
Q: What software runs on the CSACS-1121-K9?
A: It runs Cisco Secure ACS 5.x on the Cisco Application Deployment Engine (ADE) operating system. Exact supported ACS versions depend on the hardware and software revision.
Q: Can I upgrade this appliance to Cisco ISE?
A: No. The CSACS-1121 is a dedicated ACS appliance and cannot be converted to ISE. Migration requires a separate ISE deployment (virtual or physical SNS appliances).
Q: Does it support both RADIUS and TACACS+?
A: Yes. The appliance fully supports RADIUS for network access and TACACS+ for device administration, along with multiple EAP methods and identity stores.
Q: How is initial configuration performed?
A: Initial setup is typically done via the serial console port using the setup utility that runs on first boot, or via the web interface after network configuration.
Q: Why is this priced lower than current Cisco AAA solutions?
A: It is a discontinued legacy appliance sold as New Surplus or residual stock. Pricing reflects remaining inventory rather than current production cost. All units undergo basic functional verification before shipment. Standard warranty is typically 12 months (or as stated for the specific unit).
Q: Is a dual power supply version available?
A: Some CSACS-1121 units shipped with redundant power supplies. Confirm the exact configuration of the unit you are purchasing if dual PSU is required.
