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For more information about SRP module redundancy, see "Managing Module
Redundancy" on page 7.
Unified ISSU Phases Overview
The JUNOSe Software includes software modules that operate the following hardware
components:
A unified in-service software upgrade replaces the currently operating software on
each of these components with a higher-numbered release. The unified ISSU also
upgrades or re-creates the state and configuration data of the configured applications.
Before you begin the unified in-service software upgrade, you must first prepare the
router for the upgrade. See "Hardware and Software Requirements Before Beginning
a Unified ISSU" on page 60 for more information.
The unified in-service software upgrade takes place in three phases:
1.
2.
3.
Related Topics
Unified ISSU Initialization Phase Overview
When you issue the issu initialize command, unified ISSU first verifies whether all
requirements for the upgrade are met. The verification process examines the running
SRP module
Line module control plane
Line module forwarding plane
Initialization Phase When you issue the issu initialize command, unified ISSU
verifies whether all prerequisites for the upgrade have been met. The router is
prepared for the upgrade. The configuration that has been mirrored to the standby
SRP module is upgraded according to the upgrade release. This phase can last
from a few minutes up to 40 minutes depending on the number of software
releases across which the router is being upgraded.
Upgrade Phase When you issue the issu start command, unified ISSU again
verifies whether all prerequisites for the upgrade have been met. During this
phase the line module control plane and forwarding plane are upgraded and all
three hardware components are resynchronized.
Service Restoration Phase This phase automatically begins without user
intervention when the upgrade phase has completed. During this final phase,
the router is returned to a normal, runtime state.
Unified ISSU Initialization Phase Overview on page 63
Unified ISSU Upgrade Phase Overview on page 66
Unified ISSU Service Restoration Phase Overview on page 71
Halting Unified ISSU During Initialization Phase on page 99
Halting Unified ISSU During Upgrade Phase on page 100
Chapter 4: Configuring a Unified In-Service Software Upgrade
Unified ISSU Phases Overview
63
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