Overview
Software Release 17.9.x for the Catalyst 9400 Series supports a modular enterprise access switching platform designed for secure and scalable campus deployments. This release continues the unified ASIC architecture approach and supports high availability and software-defined access designs.
Key functional enhancements in this release include expanded hardware capability for auto negotiation and improved EVPN overlay behaviors. Ongoing maintenance releases in this train focus on stability and defect resolution across campus environments.
New Features and Enhancements
Release 17.9.6a and Later Maintenance Releases
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No new hardware features.
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No new software features beyond maintenance fixes.
Release 17.9.6
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Maintenance release focused on platform stability and addressing identified defects.
Release 17.9.1
Hardware and Software Enhancements
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Auto Negotiation on High-Speed Copper SFP Modules: Support for auto negotiation on copper-based SFP modules at 25G and above on advanced supervisor modules.
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EVPN TCP MSS Adjustment: Support for IPv4 and IPv6 TCP MSS adjustment in EVPN routed overlays.
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Concurrent DHCP Snooping and Egress SPAN: Ability to configure DHCP snooping alongside egress SPAN on the same interface in non-software-defined access deployments.
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MACsec High Availability on Line Card Ports: High-availability support for MACsec on line card ports when using newer supervisor hardware.
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MACsec XPN Support on Supervisor Ports: Extended packet numbering support for MACsec on supervisor interfaces.
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Perpetual PoE Support: Support for uninterrupted PoE power even during supervisor reboot sequences.
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Programmability enhancements including updated YANG data models and CLI enhancements.
Supported Hardware
Chassis Models
| Model | Description |
|---|---|
| C9404R | 4-slot chassis with redundant supervisors, two line-card slots, hot-swappable fan trays, and four power supply slots |
| C9407R | 7-slot chassis with redundant supervisors, five line-card slots, and hot-swappable fan trays |
| C9410R | 10-slot chassis with high-density line-card scalability |
Supervisor Modules
| Model | Description |
|---|---|
| C9400-SUP-1XL-Y | Advanced supervisor module |
| C9400-SUP-1XL | Standard supervisor module |
Line Cards
| Model | Description |
|---|---|
| C9400-LC-24S | 24-port Gigabit Ethernet SFP module |
| C9400-LC-24XS | 24-port 1G/10G SFP+ module |
| C9400-LC-48H | 48-port Gigabit Ethernet UPOE+ module |
| C9400-LC-48HN | 48-port multigigabit Ethernet module |
| C9400-LC-48P | 48-port PoE/PoE+ Gigabit Ethernet module |
| C9400-LC-48S | 48-port Gigabit Ethernet SFP module |
Important Notes
StackWise Virtual
When StackWise Virtual is enabled, this platform supports Layer 2 and Layer 3 switching, security, quality of service, multicast, monitoring, MPLS, high availability, VXLAN EVPN, and software-defined access deployments. Certain legacy features remain unsupported.
Unsupported Features
Some functions are not supported in this release or on specific hardware setups, including selected audio/video bridging protocols, Fast PoE legacy modes, IPsec VPN functions, and selected MACsec configurations.
Upgrade and Maintenance Information
This release includes details on software image installation, ROMMON and programmable logic device upgrades, supported downgrade paths, and in-service software upgrade procedures.
Limitations and Troubleshooting
Limitations may include quality-of-service behavior on select interfaces and hardware-dependent restrictions. Operational checks and validation steps are provided for redundancy and upgrade scenarios.
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