Overview
These release notes describe supported hardware, software features, limitations, and operational considerations for the 9400 Series switches running IOS XE Bengaluru 17.5.x.
The 17.5.x release train brings significant improvements to security features, routing stability, enhanced programmability, and high availability. It is designed for enterprise-class environments requiring reliable and secure switching platforms.
What’s New in 17.5.x Releases
Software Enhancements
Key features introduced in the 17.5.x release:
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Enhanced Security Features
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Expanded support for 802.1X MAC Authentication Bypass (MAB)
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Improved RSA Key Generation for stronger encryption and network security
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New support for Dynamic ARP Inspection to enhance network protection
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Routing and Performance Improvements
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Optimized OSPFv3 and BGP for faster convergence times and higher routing scalability
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Enhanced ECMP (Equal Cost Multi-Path) routing for increased redundancy and reliability
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Increased support for VRF Lite, improving segmentation of networks with minimal resource usage
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Programmability Features
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Expanded NetFlow and sFlow integration for deeper traffic analysis
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Updated YANG data models for more advanced network automation and management
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Full support for RESTCONF and NETCONF for improved programmatic access to device configurations
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QoS Enhancements
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Improved DSCP marking for more granular traffic prioritization
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PBR (Policy-Based Routing) now supports IPv6 to accommodate next-gen network architectures
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Enhanced CoS (Class of Service) for better voice and video traffic handling
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High Availability and Serviceability Improvements
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Dual Supervisor Redundancy now supports faster failover and recovery times
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Improved diagnostic tools for system health monitoring and error logging
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Faster Software Installation and Rollback process to minimize downtime during updates
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Unsupported Features
The following features are not supported in this release:
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Audio Video Bridging (IEEE 802.1AS, 802.1Qat, 802.1Qav)
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StackWise Virtual Stacking
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Gateway Load Balancing Protocol (GLBP)
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MACsec encryption on certain modules
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Resilient Ethernet Protocol (REP)
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IPsec VPN tunnel services
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Performance Monitoring (PerfMon)
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VRF-aware web authentication
These features remain unsupported for stability and compatibility reasons within the 17.5.x train.
Supported Hardware
Supported Switch Chassis
| Model | Description |
|---|---|
| C9404R | Four‑slot modular chassis supporting redundant supervisors |
| C9407R | Seven‑slot modular chassis supporting redundant supervisors |
| C9410R | Ten‑slot modular chassis supporting redundant supervisors |
Supervisor Modules
| Model | Description |
|---|---|
| C9400-SUP-1 | Supervisor 1 module |
| C9400-SUP-1XL | High‑memory supervisor module |
| C9400-SUP-1XL-Y | Enhanced capacity supervisor module |
Line Card Modules
| Model | Description |
|---|---|
| C9400-LC-24S | 24‑port 1G SFP module |
| C9400-LC-48S | 48‑port 1G SFP module |
| C9400-LC-48P | 48‑port 1G PoE/PoE+ module |
| C9400-LC-48T | 48‑port 10/100/1000BASE‑T module |
| C9400-LC-48U | 48‑port UPOE switching module |
| C9400-LC-48UX | 48‑port UPOE multigigabit module (up to 10G) |
| C9400-LC-24XS | 24‑port SFP/SFP+ 1G/10G module |
Storage and Power Modules
| Model | Description |
|---|---|
| C9400-SSD-240GB | 240 GB SATA SSD module |
| C9400-SSD-480GB | 480 GB SATA SSD module |
| C9400-SSD-960GB | 960 GB SATA SSD module |
| C9400-PWR-2100AC | 2100 W AC power supply |
| C9400-PWR-3200AC | 3200 W AC power supply |
| C9400-PWR-3200DC | 3200 W DC power supply |
Optics Support
A wide range of optical transceiver modules is supported based on the selected line card and interface type. Compatibility details can be found in the optics compatibility matrix.
Licensing, Installation, and Software Management
This release includes detailed guidelines on available license models, installation and upgrade procedures, rollback options, and best practices for managing system configurations.
Caveats and Troubleshooting
This release documents known limitations, open issues, resolved bugs, and troubleshooting steps for better deployment experiences. Detailed caveats will be addressed in future software updates.
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