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## Installing JUNOSe Software

The JUNOSe software resides on a nonvolatile storage (NVS) card located in the switch route processor (SRP) module. Each SRP module is shipped with an NVS card that contains a software release. Each SRP module is shipped with an NVS card that contains a software release. New software releases are shipped on a set of CDs. You can also download software releases from the Juniper Networks Web site.

| Caution: See the Release Notes for extra information about installing and upgrading the software.

This chapter provides information on how to install a new software release on a router and contains the following sections:

- Overview
- Platform Considerations
- Installing Software When a Firewall Exists
- Installing Software When a Firewall Does Not Exist
- Copying Release Files from One Router to Another
- Upgrading Systems That Are Operating with Two SRP Modules
- Upgrading from Release 5.1.1 or Lower-Numbered Releases
- Downgrading JUNOSe Software

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