Getting Started with Unified In-Service Software Upgrade
The unified in-service software upgrade (ISSU) feature enables you to upgrade between two different Junos OS releases with no disruption on the control plane and with minimal disruption of traffic.
To quickly access the information you need, click on the link in Table 1.
Table 1: Locating the Information You Need to Work With ISSU
Task You Need to Perform
Where The Information Is Located
Verify unified ISSU support for your device
Perform a unified ISSU
Verify that the unified ISSU is successful
Understand how the unified ISSU process works
Unified ISSU takes advantage of the redundancy provided by dual Routing Engines and works in conjunction with the graceful Routing Engine switchover feature and the nonstop active routing feature.
Unified ISSU provides the following benefits:
Eliminates network downtime during software image upgrades
Reduces operating costs, while delivering higher service levels
Allows fast implementation of new features