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

In JUNOS Release 8.5, the JUNOS software was extended to use FreeBSD version 6.1. As a result, the following requirements apply when you upgrade your routing platform to JUNOS Release 8.5 and later:

• For J-series, M-series, MX-series, and T-series routing platforms, the minimum requirement for installation media (such as a compact flash disk, internal flash disk, or PC Card) is 256 MB.
• For M-series, MX-series, and T-series routing platforms, you must perform the upgrade using the jinstall package.
• For all routing platforms, when upgrading from JUNOS Release 8.2 or below, you must use the no-validate option when you issue the request system software add command to perform the upgrade.
• For J-series Services Routers, you must perform the upgrade using the CLI. Do not use the Quick Configuration upgrade option in the J-Web user interface.

This section discusses the following topics:

• Upgrade to Release 8.5
• Downgrade from Release 8.5