Deep Dive into Cisco N9500 Hardware Specifications: Chassis, Supervisors, and Architecture

Deep Dive into Cisco N9500 Hardware Specifications: Chassis, Supervisors, and Architecture

Modern application architectures demand networks that are simple, programmable, extensible, scalable, and shareable. These applications are increasingly multinode, highly modular, and deployed across bare-metal, virtual, and cloud data center environments. The Cisco N9500 Series modular switches provide the physical foundation for these complex operations, functioning in either Cisco Application Centric Infrastructure (Cisco ACI) or Cisco NX-OS operating modes. For IT procurement directors and data center architects, evaluating the exact hardware specifications—ranging from physical chassis dimensions to supervisor computational power—is a critical step in facility planning.

Revolutionary Midplane-Free Chassis Architecture

The Cisco N9500 Series is the first switch chassis designed without a midplane. Within this structural configuration, the line cards and fabric modules connect directly to one another. This design provides optimal front-to-back airflow and helps the switch operate with less power. The supervisor modules, system controllers, power supplies, and line cards remain common across all chassis variants, whereas the fabric modules and fan trays plug in vertically in the rear of the specific chassis.

Chassis Scalability: N9504, N9508, and N9516 Configurations

To accommodate varying rack space, weight limits, and port density requirements, Cisco engineered three distinct chassis sizes: the 4-slot, 8-slot, and 16-slot models.

• N9K-C9504 (4-Slot Chassis): This compact unit requires 7 Rack Units (RU) and weighs 84 lb (38.2 kg). It accepts up to 4 line cards, 4 power supplies, 2 system controllers, 2 supervisors of the same type, and 3 fan trays. The MTBF is rated at 1,038,080 hours.
• N9K-C9508 (8-Slot Chassis): Occupying 13 RU, this mid-size chassis weighs 150 lb (68.2 kg). It scales to support up to 8 line cards, 8 power supplies, 2 system controllers, 2 supervisors, and 3 fan trays. The MTBF stands at 928,910 hours.
• N9K-C9516 (16-Slot Chassis): The maximum density unit requires 21 RU and weighs 192 lb (87.3 kg). It accommodates up to 16 line cards, 10 power supplies, 2 system controllers, 2 supervisors, and 3 fan trays. The MTBF is 680,000 hours.

Each of these three chassis models supports up to 6 fabric modules of the same type.

Supervisor Modules: The Computational Core

A pair of redundant supervisor modules manages all switch operations using a state-synchronized, active-standby model. The supervisor accepts an external clock and features two USB ports, a serial port, and a 10/100/1000-Mbps Ethernet port for direct management. Redundant supervisors should be of the same type within a chassis.

The platform offers multiple processing tiers:

System Controllers and Thermal Management

To ensure the supervisor modules dedicate their processing power solely to network operations, a pair of redundant system controllers (N9K-SC-A) offloads chassis management functions. These controllers manage the power supplies and fan trays. They also act as the central point for the Gigabit Ethernet Out-of-Band Channel (EOBC) traversing the supervisors, fabric modules, and line cards.

For thermal regulation, the chassis accepts hot-swappable fan trays. Each fan tray covers two fabric module slots. Administrators must install an appropriate fabric module blank card in all empty fabric module slots to ensure proper air-flow and cooling of the chassis.

High-Efficiency Power Supply Units

The N9500 platform accommodates hot-swappable, front-panel-accessible AC, DC, and universal high voltage AC/DC power supplies. The required power budget determines the system’s ability to support specific redundancy modes: combined, n+1, n+n, or input-source redundancy.

All Cisco N9500 Series switch power supplies are rated at or higher than 80PLUS Platinum for AC inputs and equivalent efficiency for DC inputs. The 3150W high voltage AC/DC power supply delivers two power inputs, each capable of providing up to 3150 W of output power, and achieves an 80PLUS Titanium rating for AC inputs.

Hardware Reliability and Environmental Specifications

• Operating Parameters: The hardware sustains an operating temperature of 32 to 104°F (0 to 40°C) and operates in humidity levels of 5 to 95% (noncondensing).
• Altitude Tolerance: The chassis functions at altitudes ranging from 0 to 13,123 ft (0 to 4,000m).
• Compliance: The product is RoHS-6 compliant with exceptions for leaded-ball grid-array (BGA) balls and lead pressfit -connectors.
• Hardware Warranty: The N9500 platform carries a 1-year limited hardware warranty that facilitates hardware replacement with a 10-day turnaround from receipt of a Return Materials Authorization (RMA).

Frequently Asked Questions (FAQ)

Q: Can I mix different supervisor models in a single Cisco N9500 chassis?

A: No, redundant supervisors should be of the same type within a chassis to maintain the state-synchronized, active-standby model.

Q: Does the system controller handle data traffic?

A: No, the system controllers offload chassis management functions from the supervisor modules, manage power supplies and fan trays, and serve as the central point for the Gigabit Ethernet Out-of-Band Channel (EOBC).

Q: How do I manage empty fabric module slots to prevent overheating?

A: Network operators must deploy an appropriate fabric module blank card in all empty fabric module slots to ensure proper air-flow and cooling of the chassis.

Q: Are the management components hot-swappable?

A: Yes, the supervisor modules, system controllers, fan trays, and power supplies are hot-swappable to maximize uptime.

Secure Your Enterprise Data Center Infrastructure

Contact the pre-sales engineering team at itmall.sale for global logistics, exact hardware sizing, and technical validation of Cisco N9500 Series chassis, supervisors, and power modules.