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Jump to Upgrade / Downgrade All Software Packages - Download the jinstall software package from Juniper Networks Download Software site. Use this guide for information relevant to upgrading Junos OS and related software: software packages, upgrading and downgrading Junos OS releases, system.
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This chapter is from the book
Juniper Networks Reference Guide: JUNOS Routing, Configuration, and Architecture: JUNOS Routing, Configuration, and Architecture
This chapter is from the bookThis chapter is from the book
Juniper Networks Reference Guide: JUNOS Routing, Configuration, and Architecture: JUNOS Routing, Configuration, and Architecture
3.6 JUNOS Software Upgrade Procedure
Juniper Networks releases several new versions of JUNOS software each year, as needed. This section will prepare you to perform a JUNOS software upgrade to the router.
Every JUNOS software release is actually a group of files bundled together. These files can be installed all at once or individually. Table 3–6 lists the files contained in the release.
Table 3–6 JUNOS Upgrade Software Release Files
To see the software that is currently installed on the router, use the following command:
To upgrade your software, there are several simple steps (following this list, we will explain each item in more detail):
3.6.1 Downloading the Software
When you download JUNOS software from the Juniper Networks Web site at http://www.juniper.net/support using your authorized username and password, you will notice that the packages use a standard naming convention. The format is package-x.yZnumber.tgz:
3.6.2 Backing Up the System
You can create a recoverable snapshot of the current system, if it is stable, before proceeding. Using this command, however, will make the running and backup versions of the software identical and will mean that you cannot revert back to the original version that shipped with the router. To make the snapshot, use the following command:
This will back up the /root file system to /altroot and the /config file system to /altconfig on the hard disk.
3.6.3 Copying the Package(s) to the Router
After you have backed up your system files, copy the new software bundle to the router's hard disk, using a command such as the following:
This will copy the file from an FTP server to the /var/tmp directory on the router's hard disk. This is simply an example of one way to copy the file. The M40 also has an LS-120 floppy drive that can be used for the storage and transfer of files. When installing a new software version, you should do so from an out-of-band management source, such as the console. An in-band source, such as Telnet, could be lost while you are upgrading.
3.6.4 Adding the Package(s)
Once the files have been copied to the hard disk, upgrade the software using the following command:
As you can see in the example, once you begin to install the new jbundle, the system deletes the old information and explodes (expands) the zipped files contained in the new bundle into the /var/sw/pkg/jbundle-package-name file.
3.6.5 Finishing the Upgrade
Once the software upgrade has completed, you should perform a system reboot. This is the last step in upgrading the JUNOS software package(s). Use the following command:
NOTE
Special instructions for upgrading to version 5.0 or reverting to an earlier release from version 5.0 are available on the Juniper Networks Web site at http://www.juniper.net/techpubs/software/junos50
/swconfig50-getting-started/html/getting-started-upgrade50.html#1017395. Related Resources
A topic essential to operating your network is software upgrades. The delivery model of new Junos releases simplifies the process of upgrading compared to other networking systems.
New releases and numbers
Juniper ships new major versions of the Junos OS to deliver new features and functionality to its customers three to four times per year.
Junos releases are numbered according to a year.sequence convention. For example, the last release of 2011 is 11.4 and the first release in 2012 will be 12.1. You can determine the release version from the release package name. For example:
Maintenance and service releases
Following the availability of any major Junos OS version, Juniper also issues maintenance and service releases to deliver needed fixes to that shipping version throughout its support life.
Engineering support for new releases
Juniper supports the Junos operating system in two phases.
Juniper provides a six-month notice of the EOL for each of the version releases. When the release reaches EOL, Juniper removes the software images from its site, and JTAC provides support on a reasonable commercial basis.
The last release of the year is known as an Extended End of Life (EEOL) release and provides active engineering support for three years, followed by six months of JTAC support.
Download new releases
You can find the latest supported releases of the Junos OS on Juniper’s download site.
Find the image for the particular platform that you’re upgrading. Choose between the domestic image, which is for use in the United States and Canada, and a worldwide image (export). The technical documentation for each platform is freely available in multiple formats.
Although they don’t necessarily need to, many users routinely upgrade the version of the Junos OS running on their devices. Regular upgrades ensure that they have ready access to the latest features. If their network requires a new feature, it’s already a part of the software on their devices, and they simply activate it in their deployed release whenever they’re ready to use it.
The online technical documentation, Junos Installation and Upgrade Guide, provides details about upgrading the software version of yourdevice.
The algorithm for selecting which new version to use is straightforward: Choose a release with a higher number, and you receive the existing capabilities of your device along with the new functionality available up through to that release version. Any organization with a valid support contract can freely download new releases of the Junos OS from the Juniper support site.
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