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## 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

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