What Is the Cisco CN12900-ACK=? License Features, Compatibility, and Deployment Scenarios

​​Understanding the CN12900-ACK=​​

The Cisco CN12900-ACK= is a ​​permanent feature license​​ designed for Cisco Nexus 9000 Series switches, specifically enabling ​​Advanced Keyless Cryptography (AKC)​​ capabilities. This license unlocks enhanced security protocols for data encryption and secure communication in high-performance data center environments. Unlike subscription-based models, it provides perpetual access to AKC features without recurring fees.

​​Core Technical Specifications​​

• ​​Functionality​​: Enables ​​AES-256-GCM and AES-256-CBC encryption​​ for hardware-accelerated MACsec (IEEE 802.1AE) on supported line cards.
• ​​Compatibility​​: Exclusive to Nexus 9300-EX/FX/FX2 and 9500 Series switches with NX-OS 9.3(5) or later.
• ​​Deployment​​: Requires no physical installation; activated via Cisco Smart Software Manager (SSM) after purchase.

​​Key Use Cases​​

Data Center Security Compliance

The license is critical for enterprises subject to ​​FIPS 140-2 or GDPR requirements​​, ensuring encrypted data transmission between servers, storage, and edge devices.

High-Speed Encryption

By offloading encryption to the switch’s ASIC, the CN12900-ACK= minimizes latency for applications like financial trading platforms or real-time analytics.

​​Addressing Common User Concerns​​

​​Q: Does this license impact switch performance?​​
A: No. ​​Hardware-based encryption​​ preserves throughput, even at line rates up to 100Gbps.

​​Q: Can it be transferred between devices?​​
A: Licenses are tied to the switch’s serial number. For multi-device deployments, volume licensing options are recommended.

​​Procurement and Activation​​

Organizations can purchase the CN12900-ACK= license directly through Cisco-authorized partners. For verified pricing and license terms, visit the “CN12900-ACK=” product page.

​​Final Perspective​​

The CN12900-ACK= addresses a critical gap in data center security by simplifying compliance without sacrificing performance. While its upfront cost may deter smaller deployments, enterprises handling sensitive data will find it indispensable. Cisco’s decision to offer it as a perpetual license—rather than a subscription—reflects a pragmatic approach to long-term infrastructure investments.