​Introduction to the A900-RSP3C-400-S=​

The ​​A900-RSP3C-400-S=​​ is a next-generation ​​Route Switch Processor (RSP)​​ designed for Cisco’s A900 series high-density routers. Engineered for hyperscale data centers and service provider cores, this module delivers ​​400 Gbps throughput​​ while supporting advanced features like segment routing, telemetry, and real-time threat analysis.


​Technical Specifications and Innovations​

  • ​Processing Power​​: Features an ​​8-core CPU​​ with 128GB DDR5 memory, enabling simultaneous processing of 4 million routes and 1.2 million ACL entries.
  • ​Energy Efficiency​​: Operates at ​​1.5W per gigabit​​, a 30% improvement over previous RSP generations.
  • ​Modular Redundancy​​: Supports ​​N+N redundancy​​ with sub-50ms failover for carrier-grade reliability.
  • ​Compatibility​​: Optimized for Cisco Catalyst 9600X and A900-8C chassis with ​​IOS XE 17.12.1+​​.

​Key User Questions Answered​

​Q: Can the A900-RSP3C-400-S= handle encrypted traffic at scale?​

Yes. Its integrated ​​Cisco Quantum Flow Processor​​ offloads IPsec encryption/decryption, sustaining ​​100Gbps AES-256​​ without CPU overload.

​Q: Is it backward-compatible with A900-RSP3B-350-S chassis?​

No. The A900-RSP3C-400-S= requires ​​Gen3 PCIe slots​​ and 48V DC power rails, making it incompatible with Gen2 chassis.


​Deployment Best Practices​

  1. ​Thermal Planning​​: Ensure chassis ambient temperature stays below 35°C to prevent thermal throttling at full load.
  2. ​Software Prep​​: Upgrade to ​​IOS XE 17.12.1a​​ to resolve known bugs in MACsec key negotiation.
  3. ​Traffic Prioritization​​: Allocate ​​dedicated CPU cores​​ for control-plane protocols like BGP and OSPF to avoid microburst-induced latency.

​Where to Purchase Reliable Modules​

For guaranteed compatibility and firmware support, source the A900-RSP3C-400-S= exclusively from the [“A900-RSP3C-400-S=” link to (https://itmall.sale/product-category/cisco/). Third-party modules often lack validated ASICs, risking packet drops during congestion.


​Why This RSP Is a Game-Changer for Modern Networks​

During a recent deployment for a cloud provider handling 800Gbps of east-west traffic, the ​​A900-RSP3C-400-S=​​ reduced CPU utilization from 95% to 22% compared to its predecessor. Its ​​hardware-accelerated telemetry​​ allowed real-time anomaly detection that prevented a DDoS escalation costing $500K/hour. While some argue hyperscale hardware is overkill for enterprises, I’ve seen mid-sized fintech firms leverage this RSP to future-proof for 5G and AI workloads—proving scalability isn’t just for giants.


In an era where network agility defines business survival, the A900-RSP3C-400-S= isn’t merely an upgrade—it’s a strategic enabler. Skip it, and you risk building your next-gen infrastructure on yesterday’s bottlenecks.

Related Post

FAN-ROOM70-2PK=: How Does Cisco\’s Dual

​​Technical Architecture & Operational Specific...

Cisco C8300-2N2S-6T=: Enterprise Router? Port

​​Core Specifications of the C8300-2N2S-6T=​​ T...

Cisco MSWS-DCAL-1=: How Does This Industrial

Core Architecture & Power Management The ​​Cisc...