M-series, MX-series, and T-series Upgrade and Downgrade Instructions

With JUNOS Release 9.0 and later, the compact flash disk memory requirement for JUNOS software is 1 GB. For M7i and M10i routing platforms with only 256 MB memory, see the Customer Support Center JTAC Technical Bulletin PSN-2007-10-001 at https://www.juniper.net/alerts/viewalert.jsp?txtAlertNumber=PSN-2007-10-001&actionBtn=Search.

This section discusses the following topics:

• Upgrade to Release 9.0
• Upgrade a Router with Redundant Routing Engines
• Upgrade for a Routing Matrix
• Downgrade from Release 9.0

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