Nssu And Junos Os Release Support; Overview Of Nssu Configuration And Operation - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

NSSU and Junos OS Release Support

Overview of NSSU Configuration and Operation

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Copyright © 2010, Juniper Networks, Inc.
The line cards in the first upgrade group (or the line card in slot 0, if no upgrade groups
4.
are defined) download the new image and then restart. Traffic continues to flow
through the line cards in the other upgrade groups during this process.
When line cards restarted in step 4 are online again, the line cards in the next upgrade
5.
group download the new image and restart. This process continues until all online
line cards have restarted with the new software.
NOTE: If you have taken a line card offline with the CLI before you start
the NSSU, the line card is not restarted and remains offline.
The switch performs a graceful Routing Engine switchover, so that the upgraded
6.
backup Routing Engine becomes the master.
The switch installs the new software on the original master Routing Engine.
7.
To complete the upgrade process, the original master Routing Engine must be
rebooted. You can do so manually or have the switch perform an automatic reboot
by including the reboot
has been rebooted, you can return control to it by requesting a graceful Routing Engine
switchover.
An EX8200 switch must be running Junos OS Release 10.4 or later before you can perform
an NSSU. If a switch is running a software version that does not support NSSU, use the
procedure described in "Installing Software on an EX8200 Switch with Redundant Routing
Engines (CLI Procedure)" on page 85 to upgrade the software.
You cannot use NSSU to downgrade the software—that is, to install an earlier version of
the software than is currently running on the switch. To downgrade the software, use
the procedure described in "Installing Software on an EX8200 Switch with Redundant
Routing Engines (CLI Procedure)" on page 85.
NSSU requires no configuration. You can optionally configure line-card upgrade groups
using the CLI. See "Example: Configuring Nonstop Software Upgrade on EX Series
Switches" on page 1186.
You perform an NSSU by executing the
command. Graceful Routing Engine switchover and nonstop active routing must be
enabled before you execute the command. For detailed instructions on how to perform
an NSSU, see "Upgrading Software Using Nonstop Software Upgrade (CLI Procedure)"
on page 1197.
Upgrading Software Using Nonstop Software Upgrade (CLI Procedure) on page 1197
Example: Configuring Nonstop Software Upgrade on EX Series Switches on page 1186
option when you request the NSSU. After the original master
request system software nonstop-upgrade
Chapter 50: High Availability—Overview
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