Juniper Networks ERX Hardware 8 - Manual (Page 105)

Maintaining ERX Routers
Upgrading from Release 5.1.1 or Lower-Numbered Releases to Release 6.x.x
or Higher-Numbered Releases
Release 5.1.1 or lower-numbered releases support application images only up to
172 MB. To install larger application images for Release 6.0.0 and higher-numbered
releases, you must first install Release 5.1.2 (or a higher-numbered 5.x.x release).
This enables the system to support application images greater than 172 MB. For
example, you cannot go from Release 5.1.1 to Release 7.2.0 without first upgrading
to Release 5.1.2. See the following table for compatibility of releases.
JUNOSe Release Highest Release Able to
Load Cannot Load Maximum Application Image
5.1.1 or lower-numbered
release 5.3.5p0-2 or the
highest-numbered 5.x.x
release 6.x.x or higher-numbered
release ~172 MB
5.1.2 or higher-numbered
release No limitation Not applicable ~234 MB
7.2.0 or higher-numbered
release No limitation Not applicable ~256 MB
Your software upgrades may be available remotely through Telnet or FTP, or may
be delivered on a new NVS card. Depending on how you access the software
updates, there are two different procedures to follow. For more detailed information
on installing software, and about NVS cards and SRP modules, see:
JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules
“Upgrading NVS Cards on SRP Modules” on page 87
Upgrading NVS Cards on SRP Modules
This section describes how to install higher-capacity NVS cards on SRP modules.
The procedure you use depends on the number of SRP modules in the system.
A new NVS card already contains the software release you ordered.
NOTE: The new NVS card must contain the same software release that you are
running on the system.
Upgrading a System That Contains One SRP Module
If the system contains only one SRP module, you must power down the
system before you upgrade the NVS card.
Upgrading NVS Cards on SRP Modules 87