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Cisco IOS Software Releases 12.1 Special and Early Deployments

Cisco IOS Software Release 12.1DA

Document ID: 20333

Early Deployment (ED) Release Summary

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Description of the release

Cisco IOS® Software Release 12.1DA is a specific technology early deployment (STED) release based on 12.1 Mainline. This release introduces the Cisco 6160 and offers a migration path to customers with Cisco 6260. Cisco IOS Software Release 12.1DA can also be fully synched to the IOS 12.1 mainline in order to inherit bug fixes committed to that main release.

For more information, see the following pages: 


Product Support

Major Features
Cisco 6160 and 6260
  • ni2-dsl-mz
Based On
Ported Into

Synchronization Points with Major Releases

Cisco IOS Software Release 12.1(1) Cisco IOS Software Release 12.2T

Release Type

Cisco IOS Software Release 12.1DA is an Early Deployment Release. Early Deployment Releases (ED) as a group are based on Major Releases of Cisco IOS Software. ED Releases are a vehicle to quickly deliver new functionality, addressing the need for early availability of product. These Releases provide new technologies for customers to deploy in a limited manner in their networks.

Target Market

Cisco Systems, Inc. released Cisco IOS Software Release 12.1DA as an ED release for the Cisco 6160 and Cisco 6260. It is targeted for the DSL Market.

Maintenance Releases

Maintenance updates for an ED Release usually deliver support for additional platforms or features, beyond what was available at the Release's FCS. While the addition of platforms and features at maintenance releases can have a destabilizing effect on the release, Early Deployment maintenance releases are subject to the same level of testing as the maintenance releases for Major Releases.

Interim Builds

As part of the normal development process, interim builds incorporating bug fixes are created between maintenance releases. Each interim build is usually tested in a limited manner. Fixes in the interim builds are incorporated in the subsequent maintenance release, which is fully regression tested.

Recommended Customer Migration Path

Customer Upgrade From
Customer Upgrade to
IOS Software Release 12.0DA
IOS Software Release 12.2T
The recommended migration path is the logical superseding release, which brings additional features and hardware support to the network without loss of previously configured functionality.

Life Cycle

Milestones Y2K Compliance Certification Other Dates
May, 2000




Yes ED, LD MFG FCS: May, 2000

CCO Address

For more information, consult the following web pages: 

Updated: Feb 19, 2003 Document ID: 20333

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