Juniper JUNOS 10.2, Руководство по модернизации

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engineers to develop software features once and share these features across all
product lines simultaneously. Because features are common to a single source, they
generally are implemented the same way for all product lines, thus reducing the
training required to learn different tools and methods for each product. Because all
Juniper Networks products use the same code base, interoperability between products
is not an issue.
One Software Release
Each new version of JUNOS Software is released concurrently for all product lines
following a preset quarterly schedule. Furthermore, each new version of software
must include all working features released in previous releases of the software, and
must have no critical regression errors. This discipline ensures reliable operations
for the entire release.
One Modular Software Architecture
Although individual modules of the JUNOS Software communicate through
well-defined interfaces, each module runs in its own protected memory space,
preventing one module from disrupting another. This separation enables the
independent restart of each module as necessary. This is in contrast to monolithic
operating systems where a malfunction in one module can ripple to other modules
and cause a full system crash or restart. This modular architecture then provides for
high performance, high availability, security, and device scalability not found in other
operating systems.
The JUNOS Software is preinstalled on your Juniper Networks router when you receive
it from the factory. Thus, when you first power on the router, all software starts
automatically. You simply need to configure the software so that the router can
participate in the network.
You can upgrade the router software as new features are added or software problems
are fixed. You normally obtain new software by downloading the software installation
packages from the Juniper Networks Support Web page onto your router or onto
another system on your local network. You then install the software upgrade onto
the router.
Juniper Networks routing platforms run only binaries supplied by Juniper Networks.
Each JUNOS Software image includes a digitally signed manifest of executables that
are registered with the system only if the signature can be validated. JUNOS Software
will not execute any binary without a registered signature. This feature protects the
system against unauthorized software and activity that might compromise the integrity
of your router.
Related Topics
Impacts of the Operating System on the Performance of Enterprise Networks white paper:
http://www.juniper.net/solutions/literature/white_papers/200239.pdf
Software Naming Convention
All JUNOS Software conforms to the following naming convention:
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Software Naming Convention
JUNOS Release 10.2 Software Installation and Upgrade Guide