Cisco Cisco IOS Software Release 12.2(33)SRE
Cisco IOS In Service Software Upgrade Process
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Cisco IOS In Service Software Upgrade and Enhanced Fast Software Upgrade Processes
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Prerequisites for Performing the Cisco IOS ISSU Process
This section describes prerequisites for performing ISSU.
ISSU
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Ensure that both the active and the standby Route Processors (RPs) are available in the system.
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The new and old Cisco IOS software images must be loaded into the file systems of both the active
and standby RPs before you begin the ISSU process.
and standby RPs before you begin the ISSU process.
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Stateful Switchover (SSO) must be configured and working properly. If you do not have SSO
enabled, see the Stateful Switchover document for further information on how to enable and
configure SSO.
enabled, see the Stateful Switchover document for further information on how to enable and
configure SSO.
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Nonstop Forwarding (NSF) must be configured and working properly. If you do not have NSF
enabled, see the Cisco Nonstop Forwarding document for further information on how to enable and
configure SSO.
enabled, see the Cisco Nonstop Forwarding document for further information on how to enable and
configure SSO.
Restrictions for Performing the Cisco IOS ISSU Process
This section describes restrictions for performing ISSU.
ISSU
General Restrictions
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Before you perform ISSU, ensure the system is configured for redundancy mode SSO and that the
file system for both the active and standby RPs contains the new ISSU-compatible image. The
current version running in the system must also support ISSU. You can issue various commands to
determine RP versioning and compatibility, or you can use the ISSU application on Cisco Feature
Navigator.
file system for both the active and standby RPs contains the new ISSU-compatible image. The
current version running in the system must also support ISSU. You can issue various commands to
determine RP versioning and compatibility, or you can use the ISSU application on Cisco Feature
Navigator.
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Do not make any hardware changes while performing an ISSU process.
Cisco 10000 Series Internet Router Platform Restrictions
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ISSU is available only in Cisco IOS 12.2(28)SB software released for the and later.