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Overview of the A900-RSP2A-128=
The A900-RSP2A-128= is a Route Switch Processor engineered for Cisco’s ASR 9000 Series routers, designed to handle high-throughput routing and switching in carrier-grade networks. With 128 GB of DDR4 memory, it addresses the growing demand for scalable control-plane processing in 5G, IoT, and cloud-edge deployments.
Core Technical Capabilities
- Memory Capacity: 128 GB (double the 64 GB of older RSP2A models).
- Processing Power: Dual-core CPU optimized for BGP, MPLS, and segment routing at scale.
- Redundancy: Supports 1:1 or N+1 redundancy configurations for failover resilience.
- Compatibility: Works with ASR 9904, 9910, and 9922 chassis running Cisco IOS XR 7.x+.
Addressing Critical User Questions
Q: Can it coexist with older RSP modules like the A900-RSP2A-64= in the same chassis?
No—mixed RSP generations are unsupported. The chassis must use identical RSP models for stability.
Q: Does the 128 GB memory improve route table handling?
Yes. It supports >10 million IPv4/IPv6 routes, making it ideal for Tier-1 ISP backbone networks.
Performance Comparison: A900-RSP2A-128= vs. A900-RSP2A-64=
| Feature | A900-RSP2A-128= | A900-RSP2A-64= |
|---|---|---|
| Memory | 128 GB | 64 GB |
| Max Routes | 10M+ | 5M |
| Redundancy Flexibility | N+1 support | 1:1 only |
| Ideal Use Case | Core ISP, hyperscale edge | Enterprise WAN, regional SP |
Optimal Deployment Scenarios
- 5G Mobile Backhaul: Managing massive subscriber sessions and low-latency traffic.
- Cloud Gateway Routing: Handling dynamic SDN policies and virtualized network functions.
- ISP Peering Hubs: Scaling BGP tables for global route aggregation.
For verified procurement, the A900-RSP2A-128= is available via itmall.sale.
Why This RSP Redefines Scalability
Having observed ASR 9000 deployments in hypercompetitive ISP environments, the A900-RSP2A-128= eliminates control-plane bottlenecks that plague legacy RSPs during route convergence. While its upfront cost is higher, the ability to delay chassis upgrades by 3–5 years offers long-term ROI—a tradeoff operators increasingly prioritize as IPv6 adoption accelerates. In my view, dismissing memory-heavy RSPs as “overkill” underestimates the exponential growth of global routing tables post-2025.