In-service Software Upgrade

• 1 In-Service Software Upgrade
  • 1.1 What Is an In-service Software Upgrade?
  • 1.2 ISSU Limitations and Considerations
  • 1.3 Recommended Stack Topology for ISSU
  • 1.4 How ISSU Works When Upgrading Stack Units
    • 1.4.1 Pre-ISSU Compatibility Checks for a Traditional Stack
  • 1.5 Upgrading a Stack with ISSU
  • 1.6 Recommended Topology for Campus Fabric (SPX) ISSU
  • 1.7 How ISSU Works When Upgrading a Campus Fabric (SPX) System
    • 1.7.1 Pre-ISSU Compatibility Checks for an SPX System
  • 1.8 Upgrading a Campus Fabric (SPX) System with ISSU
  • 1.9 ISSU Errors
  • 1.10 Manual Error Recovery