4-5
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-10
Chapter 4 Software Upgrade Process
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 ISSU” section on page 4-4
) 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.
ISSU Upgrade Procedures
This section contains the following topics:
•
Using ISSU to Perform a Consolidated Package Upgrade in a Dual Route Processor Configuration,
page 4-5
•
Using ISSU to Upgrade the SubPackages in a Dual Route Processor Configuration, page 4-12
•
Using ISSU to Perform a Consolidated Package Upgrade in a Dual Route Processor Configuration
Consolidated packages can only be upgraded using ISSU in dual Route Processor configurations. ISSU
is not supported for consolidated package upgrades in single Route Processor configurations.
If you want the RPs on your Cisco ASR 1000 Series router to be running using a consolidated package
after the ISSU upgrade is complete, use the following instructions:
