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Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-17
Chapter 5 Software Upgrade Processes Supported by Cisco ASR 1000 Series Routers
ISSU Upgrade for Redundant Platforms
Restrictions for ISSU
Restrictions for the ISSU procedures include:
Note Cisco IOS XE software compatibility is between “like” images, for example, advipservicesk9 to
advipservicesk9, adventerprisek9 to adventerprisek9, and so on. Cross-image-type upgrades or
installations are not supported in the ISSU process. For example, you cannot upgrade ipbase to
advipservicesk9 or advipservices to advipservicesk9.
• Different image types must not be run simultaneously.
• For ATM SPAs on the Cisco ASR1000 Series Routers, ISSU from releases prior to Cisco IOS XE
Release 2.5.0 to Cisco IOS XE Release 2.5.0, or from Cisco IOS XE Release 2.5.0 to a release prior
to Cisco IOS XE Release 2.5.0, is not supported. If you want to perform ISSU in this environment,
you must first remove the configuration from the ATM SPAs on the router, and then shut down the
SPAs using the shutdown command prior to running the ISSU process.
• Cisco IOS XE releases not listed as compatible in the ISSU compatibility tables (documented in the
Release Notes for Cisco ASR 1000 Series Aggregation Services Routers as stated in the
“Prerequisites for Software Upgrade Processes” section on page 5-2) must not be run
simultaneously (in a Cisco ASR1006 series router or Cisco ASR 1013 series router) or co-installed
on any of the Cisco ASR1000 Series Routers since unexpected failures of one or both RPs or state
loss can be experienced. Cisco IOS XE releases listed as partially compatible may incur a loss of
state. Cisco IOS XE releases listed as requiring an intermediate release are not directly compatible;
however, a migration path is available to preserve some or all state by upgrading to a separate
intermediate version, as shown in the tables. The tables do not cover nonredundant (software or
hardware) environments as no incremental update is possible under those circumstances.
• In Cisco IOS XE Release 3.1S, ISSU upgrade and subpackage software upgrade from Cisco IOS XE
Release 2.x.x to Cisco IOS XE Release 3.x.xS, including release 3.1S, are not supported. The ISSU
downgrade from Cisco IOS XE Release 3.x.xS, including release 3.1S to 2.x.x, is also not supported.
ISSU upgrade and subpackage software upgrade is restarted from Cisco IOS XE Release 3.1S.
Therefore, rebuilds and releases after Cisco IOS XE Release 3.1S will support ISSU and software
upgrade and downgrade, based on the ISSU compatibility matrix tables.
Note When you run the software upgrade from Cisco IOS XE Release 2.x.x to Cisco IOS XE Release 3.x.xS,
you have to load the new image on both RPs, verify that it is good code, change the boot loader variable,
and reboot the whole chassis. Failure to do that results in a "wedged" router and the only remedy is
physically pull out one of the RPs, boot on the remaining RP, downgrade its code to the same version as
the pulled out RP and start the process over again.
ISSU Upgrade Procedures
This section contains the following topics:
• Using ISSU to Perform a Consolidated Package Upgrade in a Dual Route Processor Configuration,
page 5-7
• Using ISSU to Upgrade the Subpackages in a Dual Route Processor Configuration, page 5-13