Cisco Catalyst 9500 Manual page 245

Software Maintenance Upgrade
The Software Maintenance Upgrade (SMU) is a package that can be installed on a system to provide a fix or
a security resolution to a released image.
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Restrictions for Software Maintenance Upgrade
• SMU supports patching using install mode only.
• In Service Software Upgrade (ISSU) is not supported.
Information About Software Maintenance Upgrade
SMU Overview
The Software Maintenance Upgrade (SMU) is a package that can be installed on a system to provide a patch
fix or a security resolution to a released image.
An SMU package is provided on a per release and per component basis, and is specific to the platform.
An SMU provides a significant benefit over classic IOS software as it allows you to address the network issue
quickly while reducing the time and scope of the testing required. The Cisco IOS XE platform internally
validates the SMU compatibility and does not allow you to install non-compatible SMUs.
All SMUs are integrated into the subsequent Cisco IOS XE software maintenance releases. An SMU is an
independent and self-sufficient package and it does not have any prerequisites or dependencies. You can
choose which SMUs to install or uninstall in any order.
Starting from Cisco IOS XE Everest 16.6.1, SMUs are supported only on Extended Maintenance releases and
for the full lifecycle of the underlying software release.
The following are three basic steps to install an SMU:
Restrictions for Software Maintenance Upgrade, on page 231
Information About Software Maintenance Upgrade, on page 231
How to Manage Software Maintenance Updates, on page 232
Configuration Examples for Software Maintenance Upgrade, on page 234
Feature Information for Software Maintenance Upgrade, on page 238
System Management Configuration Guide, Cisco IOS XE Fuji 16.8.x (Catalyst 9500 Switches)
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