Outlines the available upgrade methods and illustrates the upgrade workflow.
This topic guides you through each step of the upgrade workflow.
Upgrade Guide for Cisco Catalyst 9000 Series Switches and Smart Switches
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- Post-upgrade workflow
- Recommendations for device health check
- Command set for system and application health checks
- Verify install state, ISSU state, and redundancy
- Verify CPU, memory, and control-processor health
- Verify hardware and traffic stability
- Verify physical StackWise health
- Verify StackWise Virtual system health
- Verify network services and application recovery
- Verify application-hosting health
- Additional references
- Operational boundaries and diagnostic reference
- Guidelines for troubleshooting
- Common upgrade failure symptoms and resolution reference
- First-response commands for troubleshooting upgrade issues
- Determine the actual boot and install state
- Troubleshoot image-copy and file-validation issues
- Troubleshoot normal install-mode upgrade issues
- Troubleshoot legacy bundle-mode issues
- Troubleshoot ISSU issues
- Troubleshoot xFSU issues
- Troubleshoot SMU issues
- Troubleshoot stack, supervisor, and synchronization issues
- Troubleshoot a device that boots the previous release
- Recover from ROMMON or bootloader failures
- Troubleshoot post-upgrade system or service issues
- Troubleshoot Catalyst Center SWIM upgrades
- Technical support criteria
- Collect diagnostics data
- Additional references
Upgrade Guide for Cisco Catalyst 9000 Series Switches and Smart Switches
Upgrade workflow
Updated: August 1, 2026
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