Snmp Support For Issu - Cisco Catalyst 4500 Series Configuration Manual

About Performing ISSU
The compatibility matrix represents the compatibility relationship a Cisco IOS XE software image has
with all of the other Cisco IOS XE software versions within the designated support window (for example,
all of those software versions the IOS XE software image "knows" about) and is populated and released
with every IOS XE software image. The matrix stores compatibility information between its own release
and prior releases. It is always the newest release that contains the latest information about compatibility
with existing releases in the field. The compatibility matrix is available within the Cisco IOS XE
software image and on Cisco.com so that users can determine in advance whether an upgrade can be done
using the ISSU process.
You can perform the ISSU process when the old and new Cisco IOS XE software are compatible. The
compatibility matrix information stores the compatibility among releases as follows:
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To display the compatibility matrix data between two software versions on a given system, enter the
show issu comp-matrix stored command.
Note This command is useful only for verification purposes because it is available only after the ISSU process
has started. You might want to check the compatibility matrix prior to starting ISSU. Use the Feature
Navigator to obtain the needed information:
http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp

SNMP Support for ISSU

SNMP for SSO provides a mechanism for synchronizing the SNMP configurations and the MIBs that
support SSO from the active supervisor engine to the standby supervisor engine.
Compatibility Verification Using Cisco Feature Navigator
The ISSU application on Cisco Feature Navigator allows you to:
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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
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Compatible—The base-level system infrastructure and all optional HA-aware subsystems are
compatible. An in-service upgrade or downgrade between these versions will succeed with minimal
service impact. The matrix entry designates the images to be compatible (C).
Base-level compatible—One or more of the optional HA-aware subsystems is not compatible. An
in-service upgrade or downgrade between these versions will succeed; however, some subsystems
will not be able to maintain state always during the transition from the old to the new version of
Cisco IOS XE. The matrix entry designates the images to be base-level compatible (B).
Incompatible—A core set of system infrastructure exists in Cisco IOS XE that must be able to
interoperate in a stateful manner for SSO to function correctly. If any of these required features or
subsystems is not interoperable, then the two versions of the Cisco IOS XE software image are
declared to be incompatible. An in-service upgrade or downgrade between these versions is not
possible. The matrix entry designates the images to be incompatible (I). The system operates in RPR
mode during the upgrade process when the versions of Cisco IOS XE at the active and standby
supervisor engines are incompatible.
Cisco IOS XE determines the compatibility between the active and the standby IOS XE software
dynamically during STANDBY boot up. The matrix is represented by "x".
Select a specific software bundle.
Identify which software images are compatible with the selected software image.
Chapter 6 Configuring the Cisco IOS XE In Service Software Upgrade Process
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