Overview
This document describes key features, caveats, and limitations for NX‑OS 11.0(3i) on Nexus 9000 Series ACI switches. NX‑OS is a data center OS designed for performance, scalability, and programmability. Release 11.0(3i) supports Nexus 9000 Series in ACI mode.
Supported Hardware
| Hardware Type | Product ID | Description |
|---|---|---|
| Chassis | N9K-C9504 | Nexus 9504 chassis (4 slots) |
| Chassis | N9K-C9508 | Nexus 9508 chassis (8 slots) |
| Chassis Component | N9K-C9508-FAN | Fan tray |
| Power Supply | N9k-PAC-3000W-B | 3000W AC PSU, port side intake |
| GEM Module | N9K-M6PQ | 6-port GEM pluggable module |
| GEM Module | N9K-M12PQ | 12-port or 8-port GEM pluggable module |
| Spine Switch | N9K-C9336PQ | 36-port 40G QSFP spine switch |
| Spine Bundle | N9K-C9508-B1 | 9508 chassis bundle with supervisor/module/fan/PSU/fabric modules |
| Spine Bundle | N9K-C9508-B2 | 9508 chassis extended bundle |
| Spine Fan | N9K-C9300-FAN3 | Port side exhaust fan |
| Spine Fan | N9K-C9300-FAN3-B | Port side intake fan |
| Fabric Module | N9K-C9504-FM | Fabric module for 9504 |
| Fabric Module | N9K-C9508-FM | Fabric module for 9508 |
| Aggregation Module | N9K-X9736PQ | 36-port 40G QSFP aggregation module |
| System Controller | N9K-SC-A | System controller module |
| Supervisor Module | N9K-SUP-A | Supervisor module |
| Supervisor Module | N9K-SUP-B | Supervisor module |
| ToR Leaf Switch | N9K-C93128TX | 96-port 1/10G BASE-T + 6/8 port 40G QSFP switch |
| ToR Leaf Switch | N9K-C9332PQ | 32-port 40G QSFP+ switch |
| ToR Leaf Switch | N9K-C9372PX | 48-port 10G SFP+ + 6-port 40G QSFP+ switch |
| ToR Leaf Switch | N9K-C9372TX | 48-port 1/10G BASE-T + 6-port 40G QSFP switch |
| ToR Leaf Switch | N9K-C9396PX | 48-port 1/10G SFP+ + 6/12-port 40G QSFP switch |
| ToR Leaf Switch | N9K-C9396TX | 48-port 1/10G BASE-T + 6/12-port 40G QSFP switch |
Supported FEX Models
- Nexus 2000 Series Fabric Extenders (requires NX‑OS 5.x or later)
Installation Notes
- Follow the ACI Fabric Hardware Installation Guide for proper installation.
Upgrade Instructions
- Upgrade APIC controller software first.
- Upgrade all switches in the fabric.
- Switches may require a reboot.
- Certain models do not support downgrade within this release.
Downgrade Instructions
- Downgrade APIC controllers first.
- Then downgrade fabric switches.
- Some models are not supported for downgrade to earlier releases.
Compatibility
- Supports hardware and software listed on the ACI Ecosystem Compatibility List.
- 40G-to-4×10G breakout not supported on some switches.
- APIC-to-Leaf connection requires a 10G interface on the leaf switch.
Usage Guidelines
Protocols that cannot be blocked through contracts:
- SNMP (UDP 161)
- BGP (TCP 179)
- OSPF
- BOOTP/DHCP (UDP 67/68)
- IGMP, PIM
- DNS (UDP 53), SMTP replies (TCP 25)
- HTTPS (TCP 443)
- NTP (UDP 123)
Caveats
Open Caveats
- Missing FEX logs in
show fex detail. - Events/faults not updated in GUI.
- Slow CLI command output.
- FEX diagnostic results missing.
- Packet loss after line card reload.
- REST API errors on reload.
- FEX issues behind ToR switches.
Known Behaviors
- BGP max prefix policy not supported.
- Some FEX interfaces may not multicast correctly.
- Traffic loss may occur during proxy mode reloads or vPC flaps.
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