Cisco IOS Software Releases 12.3 Mainline

End of Sale/End of Life Announcement for Cisco IOS Software Major Release 12.3

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Product Bulletin No. EOL5061

Last Updated: November 2006

Cisco Systems® announces the end-of-sale and end-of-life dates for the Cisco IOS® Software Major Release 12.3. This announcement applies to all releases in the Release 12.3 family. The last day to order the affected product is March 15, 2007. Maintenance rebuilds and software fixes will no longer be available via Release 12.3 as of March 15, 2008. Software defects found in this release are addressed by migrating to Cisco IOS Software Major Release 12.4, 12.4T, or later. Customers with active service contracts will continue to receive support from the Cisco Technical Assistance Center (TAC) until March 15, 2012.

Table 1 describes the end-of-life milestones, definitions, and dates for the affected product. Table 2 lists the product part numbers affected by this announcement.

Table 1. End-of-Life Milestones and Dates for Cisco IOS Software Major Release 12.3




End-of-life announcement date

The date the document that announces the end of sale and end of life of a product is distributed to the general public.


End-of-sale date

The last date to order the product through Cisco point-of-sale mechanisms. The product is no longer for sale after this date.


End of software maintenance releases date

The last date that Cisco Engineering may release any final software maintenance releases or bug fixes. After this date, Cisco Engineering will no longer develop, repair, maintain, or test the product software.


Last date of support

The last date to receive service and support for the product. After this date, all support services for the product are unavailable, and the product becomes obsolete.


Table 2. Product Part Numbers Affected by This Announcement

End-of-Sale IOS Software Release Versions

Product Description

Release 12.3(21)

Release 12.3(20)

Release 12.3(19)

Release 12.3(18)

The listed Cisco IOS Software Release versions are a representation of releases derived from Release 12.3. Additional Release 12.3 maintenance rebuilds may occur prior to end of software maintenance. All Release 12.3 releases and rebuilds are included in this End of Sale/ End of Engineering/ End of Life announcement.


Customers are encouraged to migrate to Cisco IOS Software Major Release 12.4, which inherits Cisco IOS Software Major Release 12.3 functionality, new functionality introduced in Cisco IOS Software Release 12.3T, and additional fixes. Customers seeking Release 12.4 functionality with the latest technology introductions are encouraged to migrate to Cisco IOS Software Release 12.4T. When upgrading to a more recent release, certain software images may not be available, hardware may or may not be supported, or memory requirements may have changed. Always consult the Cisco IOS Software Upgrade Planner and Cisco Feature Navigator to verify critical functionality on required platforms. For more information, please visit:

• Cisco IOS Software Lifecycle Dates:

• Cisco IOS Software Upgrade Planner:

• Cisco Feature Navigator:

• Cisco Software Advisor:

• Cisco IOS Software Releases:

• Cisco End-of-Life Policy:

• Subscribe to receive End-of-Life/End-of-Sale information: