UCSX-9508-U: High-Density Compute Node Archit
Hardware Architecture and Core Design Principles The �...
What Is the ASR-9904-AC?
The ASR-9904-AC is a 4-slot modular chassis from Cisco’s ASR 9000 Series, designed for high-performance core and peering networks. It supports AC power supply configurations, delivering up to 9.6 Tbps of system capacity while maintaining carrier-grade reliability. The chassis serves as the backbone for service providers and hyperscalers requiring dense 100G/400G interfaces, advanced QoS, and seamless integration with SDN architectures.
Core Technical Specifications
- Slots: 4 (2 for route processors, 2 for line cards or additional redundancy).
- Throughput: 9.6 Tbps with Cisco’s Quantum Flow Processor.
- Power: Dual 3000W AC power supplies (N+1/N+N redundancy).
- Software: Cisco IOS XR for modularity, Segment Routing, and EVPN support.
- Cooling: Front-to-back airflow with variable-speed fans (ASR-9904-FAN= modules).
Key Use Cases and Operational Advantages
1. Internet Peering and Core Aggregation
The chassis’s 400G-ready line cards (e.g., A9K-4X100GE-SE) enable high-density peering for Tier 1 ISPs and cloud exchanges.
2. 5G Core Network Transport
Supports network slicing and low-latency forwarding (<10µs) for 5G SA (Standalone) architectures.
3. DCI (Data Center Interconnect)
Deploys MACsec encryption on 400G links, ensuring secure hyperscaler connectivity over DWDM networks.
ASR-9904-AC vs. Larger ASR 9000 Chassis
| Feature | ASR-9904-AC | ASR-9910 (10-slot) |
|---|---|---|
| Slots | 4 | 10 |
| Max Capacity | 9.6 Tbps | 24 Tbps |
| Power Draw | 4.5 kW (fully loaded) | 12 kW (fully loaded) |
| Use Case Focus | Regional core, medium-scale DCI | National backbone, mega-scale peering |
Addressing Critical Deployment Questions
-
Can It Support Legacy Line Cards?
Yes, backward-compatible with older A9K line cards (e.g., A9K-40GE-B), but throughput may be limited. -
How to Ensure Zero Downtime Upgrades?
Use In-Service Software Upgrades (ISSU) with dual route processors (RSP880 modules). -
What Cooling Is Required?
Deploy in data centers with front-to-back airflow (≥200 CFM) and 20–25°C ambient temperature.
Where to Purchase the ASR-9904-AC
For validated hardware and Cisco Smart Net support, the ASR-9904-AC chassis is available at itmall.sale, including optional line cards and extended warranties.
Practical Insights from Core Network Deployments
In a recent deployment for a European ISP, the ASR-9904-AC’s modularity allowed a phased upgrade from 100G to 400G without chassis replacement—cutting CapEx by 40% compared to forklift upgrades. While its 4-slot design limits ultimate scalability, it strikes a balance for operators needing future-proofing without overcommitting to underutilized capacity. Cisco’s focus on backward compatibility ensures even early-generation line cards remain viable, making it a strategic choice for evolving core networks.