Overview
Software Release 17.7.x for the Catalyst 9400 Series continues to support a modular enterprise access switching platform designed for secure and scalable campus deployments. This release is built on a unified ASIC architecture and supports high availability and software-defined access designs.
The release enhances platform stability, feature maturity, and operational consistency, while maintaining support for advanced programmability and redundant, field-replaceable components in campus and wiring-closet environments.
New Features and Enhancements
Release 17.7.4 and Later Maintenance Releases
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No new hardware features.
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No new software features.
Release 17.7.3 and 17.7.2
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Maintenance releases focused on defect resolution and platform stability.
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No new hardware or software functionality introduced.
Release 17.7.1
Software Enhancements
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Continued support for software-defined access deployments with improved operational stability.
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Enhancements to Layer 2 and Layer 3 forwarding behavior across campus environments.
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Improvements to high-availability mechanisms, including redundancy and failover handling.
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Additional refinements to automation, telemetry, and model-driven programmability.
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Updates to security, routing, and multicast features to improve consistency and interoperability.
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, the 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 are not supported.
Unsupported Features
Some features are not supported in this release or on specific hardware combinations, including selected audio and video bridging functions, Fast PoE modes, IPsec VPN functionality, and certain MACsec use cases.
Upgrade and Maintenance Information
This release includes procedures for software image installation, ROMMON and programmable logic upgrades, supported downgrade paths, and in-service software upgrade operations.
Limitations and Troubleshooting
Known limitations include quality-of-service behavior on selected interfaces and hardware-dependent feature restrictions. Troubleshooting guidance provides operational checks and validation steps prior to redundancy events or software upgrades.
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