End-of-Life (EOL) Notice: The Cisco Nexus 9300-EX Series has officially reached its End-of-Sale (EOS) and End-of-Life (EOL) milestones. This guide is provided strictly for existing network maintenance, refurbished market purchases, and migration planning. For new data center deployments, presales engineers MUST quote the current-generation Nexus 9300-FX3, GX, or GX2 Series.
1. Product Overview & Typical Business Use Cases
The Cisco Nexus 9300-EX Series represents Cisco’s first-generation Cloud Scale ASIC platform. Built for top-of-rack (ToR) and middle-of-row (MoR) deployments in enterprise data centers, these switches support both Cisco ACI (Application Centric Infrastructure) and standalone NX-OS modes. They were designed to bridge the gap between classic 10G infrastructures and modern 25G/100G data centers.
Typical Deployment Scenarios (Brownfield & Maintenance)
| Deployment Scenario | Architectural Role | Technical Rationale |
| 25G Virtualization Compute Access | Top-of-Rack (ToR) Leaf | Direct connection to VMware vSphere, Hyper-V, or Nutanix HCI nodes utilizing 10G or 25G DAC/fiber. Provides low-latency east-west traffic switching. |
| VXLAN EVPN Leaf Nodes | VTEP Endpoint | Acts as the encapsulation/decapsulation boundary in a classic BGP EVPN spine-leaf topology, isolating tenant traffic in medium-scale data centers. |
| Legacy ACI Migrations | ACI Fabric Leaf | Serving as an ACI Leaf in aging fabrics managed by APIC controllers. Often maintained until budget allows for a complete fabric refresh to FX3 hardware. |
| Storage Area Networks (IP-SAN) | iSCSI / NVMe-oF Access | Providing lossless Ethernet capabilities (PFC, ECN) for moderate IP storage workloads, though newer platforms with deeper buffers are preferred for heavy AI/ML storage. |
2. Architecture & Form Factors
The Nexus 9300-EX utilizes a 1RU, non-blocking architecture powered by Cisco’s Cloud Scale ASIC. The platform operates under a strictly bifurcated software model: it must boot in either ACI mode or NX-OS mode.
Hardware Architecture Capabilities
| Architectural Feature | EX Series Capability | Engineering Boundary & Limitation |
| Operating System Mode | Dual-boot (NX-OS or ACI) | Requires a complete image wipe and reboot to switch modes. Not dynamically interchangeable. |
| ASIC Technology | 1st Gen Cisco Cloud Scale | Optimized for 10/25G access and 100G uplinks. Lacks the advanced telemetry capabilities of modern GX ASICs. |
| MACsec Encryption | Highly Constrained | The EX series has severe hardware limitations regarding MACsec line-rate encryption. Environments requiring pervasive DCI encryption should migrate to FX3. |
| Telemetry & Flow Data | Tetration / Nexus Dashboard | Supports hardware-based flow streaming, but ASIC export buffers are small, risking flow drop under massive DDoS or microburst conditions. |
| Fibre Channel over Ethernet | FCoE NPV Mode | Supported on specific ports (e.g., first 16 ports), but requires careful port-map validation and SAN licensing. |
Software Baselines & Golden Releases
For stability in legacy environments, engineering teams should standardize on the Cisco recommended “Golden Release” for NX-OS. For the EX platform, the 9.3(10) or 10.2(x) long-lived trains are heavily vetted. Upgrades in ACI mode MUST strictly follow the APIC compatibility matrix.
3. Performance & Scaling
Data center switches must be sized according to exact packet processing limits and buffer depth, not just interface speed.
System Performance Metrics
| Performance Metric | Flagship N9K-C93180YC-EX | N9K-C93108TC-EX (Copper) |
| Maximum Switching Capacity | 3.6 Tbps | 2.16 Tbps |
| Forwarding Rate (IPv4) | Up to 2.6 Billion packets/sec (Bpps) | Up to 1.7 Billion packets/sec (Bpps) |
| System Buffer Depth | 40 MB Shared Buffer | 40 MB Shared Buffer |
| MAC Address Table | Up to 256,000 entries | Up to 256,000 entries |
| IPv4 Host Routes | Up to 128,000 | Up to 128,000 |
| IPv4 Longest Prefix Match (LPM) | Up to 8,000 | Up to 8,000 |
| Multicast Routes | Up to 32,000 | Up to 32,000 |
Engineering Warning: The 40 MB shared buffer is adequate for standard enterprise virtualization. However, for high-frequency trading (HFT), deep-learning AI clusters, or massive Hadoop analytics environments subject to extreme microbursts, 40 MB will result in tail-drops. Presales designs for such environments must utilize Nexus 9000 switches with deep buffers (e.g., Nexus 9236C or modern equivalents).
4. Power & Typical Consumption
Power provisioning in the data center must be highly precise to avoid tripping PDU breakers or overwhelming CRAC (Computer Room Air Conditioning) units.
Exact Power Consumption (Flagship N9K-C93180YC-EX)
| Load Condition | Exact Power Draw | Heat Dissipation (BTU/hr) |
| Typical Operating Power | 210 Watts (50% traffic load, SR optics) | ~716 BTU/hr |
| Maximum Power Draw | 460 Watts (100% load, LR/DAC optics, 100% fans) | ~1,569 BTU/hr |
Power Supply Units (PSUs) & Airflow
The chassis accommodates two PSUs for 1+1 redundancy.
| PSU Part Number | Rated Output | Input Type | Airflow Direction | Application |
| NXA-PAC-650W-PI | 650W | AC (100-240V) | Port-Side Intake (PI) | Standard Cold Aisle to Hot Aisle |
| NXA-PAC-650W-PE | 650W | AC (100-240V) | Port-Side Exhaust (PE) | Reversed Airflow (Hot Aisle to Cold) |
| NXA-PDC-930W-PI | 930W | DC (-48V to -60V) | Port-Side Intake (PI) | Telco/Carrier environments |
Thermal Red Line: You MUST ensure that PSU airflow (PI/PE) matches the Fan module airflow (PI/PE). Mismatched airflow components will cause the switch to trigger an immediate hardware thermal shutdown within 2 minutes of boot to prevent ASIC meltdown.
5. Uplinks, Modules & Optics
The Nexus 9300-EX features fixed uplinks; there are no modular expansion slots.
Port Configuration Matrix
| Chassis Model | Access Ports (Downlinks) | Spine Uplinks | Breakout Capability |
| 93180YC-EX | 48 x 1G/10G/25G SFP28 | 6 x 40G/100G QSFP28 | Uplinks support 4x10G and 4x25G |
| 93108TC-EX | 48 x 100M/1G/10G BASE-T (RJ45) | 6 x 40G/100G QSFP28 | Uplinks support 4x10G and 4x25G |
| 93180LC-EX | 32 x 40G/50G QSFP+ | Configurable (up to 18x100G) | Extreme high-density leaf; requires strict port-mapping validation |
Optic & Transceiver Design Rules
- 25G Server Access: SFP28 ports natively support 1G (GLC-TE/SX), 10G (SFP-10G-SR), and 25G (SFP-25G-SR-S) speeds without requiring physical adapters.
- Twinax DAC Cables: For intra-rack server connections, 10G (SFP-H10GB-CUxM) and 25G (SFP-H25G-CUxM) passive copper cables are fully supported and represent a significant CapEx saving over optical transceivers.
- 100G Breakout Architecture: The QSFP28 uplink ports support optical splitters (e.g., QSFP-100G-SR4 to 4x SFP-25G-SR) or breakout DACs. This allows a spine port to fan out directly to compute nodes if the switch is repurposed from a ToR Leaf to a localized aggregation point.
6. Comprehensive SKUs
When sourcing refurbished hardware or verifying existing inventory, exact part numbers are critical.
| Exact Part Number | Description & Port Layout | Software Focus |
| N9K-C93180YC-EX | Nexus 9300 with 48p 10/25G SFP28 and 6p 100G QSFP28 | Primary Flagship Fiber ToR |
| N9K-C93108TC-EX | Nexus 9300 with 48p 10G BASE-T (Copper) and 6p 100G QSFP28 | Legacy Copper Server ToR |
| N9K-C93180LC-EX | Nexus 9300 with 32p 40/50G QSFP+ (Configurable up to 18p 100G) | High-Density Migration Leaf |
| NXA-FAN-30CFM-B | Nexus Fan, Port-Side Intake (Blue Latch) | Matching PI Power Supplies |
| NXA-FAN-30CFM-F | Nexus Fan, Port-Side Exhaust (Burgundy Latch) | Matching PE Power Supplies |
7. Environmental Specs & Warranty
Physical footprint planning is critical for rack elevation and weight distribution limits in legacy colocation facilities. The parameters below are hard engineering facts for the N9K-C93180YC-EX.
| Environmental Metric | Exact Specification |
| Rack Units (RU) | 1 RU |
| Exact Depth | 19.6 inches (49.8 cm) |
| Exact Width | 17.3 inches (43.9 cm) |
| Exact Height | 1.72 inches (4.4 cm) |
| Installed Weight | 17.2 lbs (7.8 kg) (Fully populated with 2 PSUs and 4 Fans) |
| Operating Temperature | 32°F to 104°F (0°C to 40°C) at sea level |
| Acoustic Noise | 48.5 dBA at 40% fan speed; 73.9 dBA at 100% fan speed |
Warranty and Maintenance Support Boundaries
Because the EX platform is End-of-Life, the standard 1-Year Limited Hardware Warranty has expired for virtually all original purchasers.
- Hardware Replacement: For ongoing operations, presales and maintenance engineers MUST verify the availability of refurbished spares (NBD replacement is no longer guaranteed directly from Cisco uncontracted).
- Software Updates: Active Cisco Smart Net Total Care (SNTC) contracts covering the exact chassis serial numbers are strictly required to obtain TAC support and to legally download security patches (NX-OS) until the published Last Date of Support (LDoS).
8. Licensing Constraints
When managing EX series switches, software licensing is heavily dependent on the NX-OS release and whether the switch is in ACI mode.
- DCN Essentials vs. Advantage: Basic BGP/OSPF and VXLAN EVPN require DCN Advantage licensing. Do not assume segment routing or Nexus Dashboard Insights entitlement from a base license tier alone.
- Smart Licensing: Smart Licensing Using Policy (SLUP) behavior depends on upgrading the NX-OS release to 9.3(6) or higher. Standalone traditional RTU (Right to Use) licensing is deprecated in modern builds.