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CHAPTER 53
Administering High Availability
Upgrading Software Using Nonstop Software Upgrade (CLI Procedure)
Preparing the Switch for Software Installation
Copyright © 2010, Juniper Networks, Inc.
Upgrading Software Using Nonstop Software Upgrade (CLI Procedure) on page 1197
Verifying Power Configuration and Use on page 1204
You can use nonstop software upgrade (NSSU) to upgrade the software on standalone
EX8200 switches with redundant Routing Engines. NSSU upgrades the software running
on the Routing Engines and line cards with minimal traffic disruption during the upgrade.
NSSU is supported on switches running Junos OS Release 10.4 or later.
With NSSU, you can upgrade both Routing Engines at the same time with a single
command. You also have the option of upgrading just one Routing Engine, the backup
Routing Engine, which becomes the master Routing Engine after the upgrade is done.
You then use the standard software installation process to upgrade the original master
Routing Engine.
This topic covers:
Preparing the Switch for Software Installation on page 1197
Upgrading Both Routing Engines Using NSSU on page 1199
Upgrading One Routing Engine Using NSSU on page 1201
Upgrading the Original Master Routing Engine on page 1203
Before you begin software installation using NSSU:
(Optional) Configure line-card upgrade groups as described in "Configuring Nonstop
Software Upgrade (CLI Procedure)" on page 1193. By default, an NSSU upgrades line
cards one at a time to allow aggregated Ethernet links that have members on different
line cards to remain up through the upgrade process. Configuring line-card upgrade
groups reduces the time an upgrade takes because the line cards in each upgrade
group are upgraded at the same time rather than sequentially.
Verify that the Routing Engines are running the same version of the software. Enter the
following command:
{master}
1197
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