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Hardware Requirements for Unified ISSU
Software Requirements for Unified ISSU
Copyright © 2010, Juniper Networks, Inc.
The router must support unified ISSU. Therefore the router must be an E120, E320, or
ERX1440 router.
Two SRP modules must be installed in the router.
All installed combinations of line modules and IOAs must support unified ISSU.
Unsupported modules that are online are reloaded during the unified ISSU, with
consequent loss of connections and traffic forwarding.
Do not install IOAs in the chassis while the unified ISSU operation is in process.
The redundant SRP module must have at least 300 MB of free memory. Depending
on their configuration, line modules require up to 75 MB of free memory.
On the ERX1440 router, certain hardware updates might require a module to be cold
restarted. Unified ISSU cannot be successfully accomplished with such modules. In this
case, the behavior is the same as for unsupported line modules. The unified ISSU process
reboots these modules and holds them down until the supported modules on the router
complete the unified ISSU process.
When hardware updates are required for modules that you have installed in an ERX1440
router, contact your Juniper Networks representative to determine whether the update
affects unified ISSU.
The running JunosE Software release must support unified ISSU.
You can upgrade to a software version that supports unified ISSU from a software
version that does not support unified ISSU only by means of a conventional upgrade.
During the conventional upgrade, all line modules are reloaded, all subscribers are
dropped, and traffic forwarding is interrupted until the upgrade is completed.
The armed (upgrade) release must be capable of being upgraded to from the currently
running release; it must be higher-numbered than the running release.
All applications that are configured on the router must support unified ISSU and stateful
SRP switchover.
If one or more unified ISSU-challenged applications are configured and you proceed
with a unified in-service software upgrade, the unified ISSU process forces a
conventional upgrade on the router. All line modules are reloaded, all subscribers are
dropped, and traffic forwarding is interrupted until the upgrade is completed.
You can avoid this circumstance by removing the configuration for the unified
ISSU-challenged applications from the router before you begin the in-service software
upgrade.
Stateful SRP switchover must be configured on the router. Use the following commands
to configure high availability:
host1(config)#redundancy
host1(config-redundancy)#mode high-availability
Chapter 5: Configuring a Unified In-Service Software Upgrade
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