Configuring a Unified In-Service Software Upgrade

This chapter describes how to prepare for and perform a unified in-service software upgrade (unified ISSU) of JUNOSe software on E120 and E320 routers. A unified in-service software upgrade provides a way to upgrade to a higher-numbered release while minimizing the effect of the upgrade on traffic forwarded through the router.

• Unified ISSU Overview
• Unified ISSU Platform Considerations
• Unified ISSU Terms That Describe SRP and Line Module Behavior
• Unified ISSU References
• Unified ISSU Phases Overview
• Application Support for Unified ISSU
• Unexpected Application-Specific Behavior During Unified ISSU
• Before You Begin a Unified In-Service Software Upgrade
• Upgrading Router Software with Unified ISSU
• Halting the Unified ISSU Process and Restoring the Original State of the Router
• Monitoring a Unified In-Service Software Upgrade