During a successful upgrade, the upgrade package removes all files from
/var/tmp
and
completely reinstalls the existing software. It retains configuration files, and similar
information, such as secure shell and host keys, from the previous version. The previous
software package is preserved in a separate disk partition, and you can manually revert
back to it if necessary. If the software installation fails for any reason, such as loss of
power during the installation process, the system returns to the originally active installation
when you reboot.
Software Package Security
All Junos OS is delivered in signed packages that contain digital signatures to ensure
official Juniper Networks software. For more information about signed software packages,
see the
Junos OS Installation and Upgrade Guide
at
http://www.juniper.net/techpubs/software/junos/index.html
.
Installing Software on a Virtual Chassis
You can connect individual Juniper Networks EX4200 Ethernet Switches together to
form one unit and manage the unit as a single chassis, called a Virtual Chassis. The Virtual
Chassis operates as a single network entity composed of members. Each member of a
Virtual Chassis runs a OS package.
For ease of management, the Virtual Chassis provides flexible methods to upgrade
software releases. You can deploy a new software release to all members of a Virtual
Chassis or to only a particular member.
Installing Software on EX8200 Switches with Redundant Routing Engines
To install software on a Juniper Networks EX8200 Ethernet Switch that has two Routing
Engines with minimal network disruption, you perform a Junos OS installation on each
Routing Engine separately, starting with the backup. See “Installing Software on an
EX8200 Switch with Redundant Routing Engines (CLI Procedure)” on page 79.
Installing Software Using Automatic Software Download
The automatic software download feature uses the DHCP message exchange process
to download and install software packages. Users can define a path to a software package
on the DHCP server and then the DHCP server communicates this path to EX Series
switches acting as DHCP clients as part of the DHCP message exchange process. The
DHCP clients that have been configured for automatic software download receive these
messages and, when the software package name in the DHCP server message is different
from that of the software package that booted the DHCP client switch, download and
install the software package. See “Upgrading Software Using Automatic Software
Download on EX Series Switches” on page 90.
Troubleshooting Software Installation
If the Junos OS loads but the CLI is not working for any reason, or if the switch has no
software installed, you can use the recovery installation procedure to install the software
on the switch. See “Troubleshooting Software Installation” on page 99.
Copyright © 2010, Juniper Networks, Inc.
70
Complete Software Guide for Junos
®
OS for EX Series Ethernet Switches, Release 10.3
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...