Each JUNOS software release consists of five software packages:
jbase--Additions to the operating system
jkernel--Operating system package
jroute--Software that runs on the Routing Engine
jpfe--Software that runs on the router's Packet Forwarding Engine
jdocs--Documentation for the software
The packages are also grouped together in a bundle, which is called jbundle.
Normally, you use the bundle to upgrade all of the software packages at the same time. You also can upgrade them individually. When upgrading to a new release, you must install the bundle; do not upgrade the packages individually.
To determine which packages are running on the router and to get information about these packages, use the show version command at the top level of the CLI.
This chapter discusses the following topics: