Nokia 7250 IXR
The Nokia 7250 IXR uses merchant silicon from the Broadcom Jericho/Qumran family, positioning it as a low-latency, high-throughput aggregation and data center edge platform.
| Field | Value |
|---|---|
| Total Buffer | Moderate (shared pool, varies by ASIC) |
| Buffer Model | Shared + VOQ (Virtual Output Queues) |
| Silicon | Broadcom Jericho/Qumran family |
| Target Interfaces | 100G / 400G |
| Target Role | Aggregation, DC edge |
Buffer Architecture
VOQ (Virtual Output Queue)
Packets are queued per egress destination rather than per ingress port. This eliminates head-of-line blocking — a slow or congested output port cannot stall traffic destined for a healthy port.
Shared Buffer Pool
Memory is dynamically allocated across ports. The total pool is smaller than FP-based systems (Nokia 7750 SR) but is used efficiently through statistical multiplexing.
Depth Profile
Shallow-to-moderate by design. The 7250 IXR prioritizes low latency and high throughput over sustained burst absorption.
What It Handles Well
- Microbursts of limited duration
- East-west data center traffic patterns
- 100G / 400G high-density aggregation
Limitations vs FP-based platforms
- Less effective under sustained congestion
- Reduced headroom under heavy oversubscription
- Smaller total buffer than 7750 SR or 7730 SXR line cards
See the Nokia Access/Aggregation architecture page for cross-platform comparison. Additionally, you can read the Broadcom Qumran architecture page for deep-dive details on the chipset.