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Cisco IOS Software Releases 12.1 T

Cisco IOS Software Release 12.1T

Document ID: 20339

Strip_TechTips

Main Release Summary



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Description

The Cisco IOS® Software Release 12.1T series is an Early Deployment (ED) release delivering the latest Cisco IOS Software functionality and platform support. Cisco IOS Software Release 12.1T will integrate new features with every maintenance release.

Cisco IOS Software Release 12.1T uses the consolidated 12.1 main release as the foundation for building new technologies.  This provides early adopter customers with the ability to implement new functionality without forgoing existing and proven technologies. 

Product and Feature Support

Incremental new features and/or platforms are added to successive maintenance revisions of this release.

Support Pages

For more information, consult the following web pages:

Release Documentation

Parent Release Documentation Other Links
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  • Cisco IOS Field Notice
  • Cisco IOS Reference Guide
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Target Market

This release is targeted for Service Providers, Enterprise, and Small and Medium Business early technology adopters.

Lifecycle of Release

Cisco IOS Reference Guide
Milestones Y2K Compliance
CCO FCS:  03/27/00

MFG FCS:  04/03/00

EOS: 

EOE: 

EOL:

Yes

Cisco IOS Software Release 12.1T will reach end of engineering with release 12.1(5)T.  The migration path for obtaining bug fixes for 12.1(5)T is Cisco IOS Software Release 12.2.  The 12.2 release is a subset of 12.1(5)T, plus additional bug fixes.
 

Maintenance Releases

There will be a maintenance version of Cisco IOS Software Release 12.1T every eight weeks to provide bug fixes and new features. 

Cisco IOS 12.1T will provide regular interims and maintenances. For more information, see the Projected Release Dates for Cisco IOS Software Product Bulletin.
 

Maintenance cycle: Download Images
8 weeks CCO IOS Upgrade Planner - 12.1T 
 

Interim Builds

Weekly interim builds will be made available to development and critical customers.

Interim builds are not recommended and are not fully tested. Customers will only be provided with interim builds when a critical defect renders the maintenance release unusable.

Recommended Customer Migration Path

Cisco IOS Software Release 12.1T will merge to Cisco IOS Software Release 12.2.
 
From
To
12.0(x)T 12.1(1) or 12.1(1)T or later* 
12.1(x)T 12.2(1) or later
12.0 X Releases 12.1(1) or 12.1(1)T or later
12.1(x)Xx Releases 12.2(1) or later
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The migration path is the logical superseding software. The uniqueness of each network requires that customers verify support for hardware, features, and protocols prior to a massive network upgrade. For more information, see the Projected Release Dates for Cisco IOS Software Product Bulletin

Related Cisco IOS Releases

Cisco IOS Software Release 12.1T is based on Cisco IOS Software Release 12.1.  12.1T contains all features and functionality of 12.1 

Cisco IOS Software Release 12.1 is based on 12.0(7)T.    These are pre-12.1(1) images that are a superset of 12.0(7)T plus additional bug fixes. 

Cisco IOS Software Release 12.1 X releases are based on 12.1T. 

Comments

For more information, see the following pages: 


Updated: May 17, 2006 Document ID: 20339