Cisco IOS 15.1M&T

End-of-Sale and End-of-Life Announcement for the Cisco IOS Software Release 15.1(1)T

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Cisco announces the end-of-sale and end-of life dates for the Cisco IOS Software Release 15.1(1)T which includes all images and rebuilds of this release. The last day to order Release 15.1(1)T is May 1, 2011. Customers with active service contracts will continue to receive support from the Cisco Technical Assistance Center (TAC) as shown in Table 1 of the EoL bulletin. Table 1 describes the end-of-life milestones, definitions, and dates for Release 15.1(1)T. Table 2 lists the product and related releases affected by this announcement. For customers with active and paid service and support contracts, support will be available until the termination date of the contract, even if this date exceeds the Last Date of Support shown in Table 1.

Table 1. End-of-Life Milestones and Dates for the Cisco IOS Software Release 15.1(1)T




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.

November 1, 2010

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.

May 1, 2011

Last Ship Date: OS SW

The last-possible ship date that can be requested of Cisco and/or its contract manufacturers. Actual ship date is dependent on lead time.

May 1, 2011

End of SW Maintenance Releases Date: OS SW

The last date that Cisco Engineering may release any final software maintenance releases or bug fixes for Release 15.1(1)T. After this date, Cisco Engineering will no longer develop, repair, maintain, or test the product software. The only exception is Vulnerability/Security issues that will be addressed as shown in the End of Vulnerability/Security Support milestone below."

November 1, 2011

End of Vulnerability/Security Support: OS SW

The last date that Cisco Engineering may release bug fixes for Vulnerability or Security issues for Release 15.1(1)T. After this date, bug fixes for Vulnerability or Security issues found in Release 15.1(1)T may be provided through later supported software releases.

Note that there will be no rebuild releases of 15.1(1)T provided after this End of Vulnerability/Security Support milestone date.

May 1, 2012

End of Vulnerability/Security Support through migration: OS SW

The last date that Cisco Engineering may release bug fixes for Vulnerability or Security issues found on Release 15.1(1)T through later supported software releases including, but not limited to, 15.1(4)M.

May 1, 2014

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.

May 31, 2016

HW = Hardware OS SW = Operating System Software App. SW = Application Software

Table 2. Product Part Numbers Affected by This Announcement

End-of-Sale Product Part Number

Product Description

Replacement Product Part Number

Cisco IOS Release 15.1(1)T

The listed Cisco IOS Software Release version is a representation of releases derived from Release 15.1(1)T. All releases and rebuilds are included in this end-of-sale and end-of-life announcement.

See the Product Migration Options section below for detailed information on replacing this product.

Product Migration Options

Customers are encouraged to migrate to the Cisco IOS Software Release 15.1(4)M which is expected to be available in the first half of calendar year 2011. While IOS 15.0(1)M is also a viable migration option, its end of sale is planned for 2012; therefore it is highly recommended to migrate to 15.1(4)M when available.
For more information on Cisco IOS Software Release 15.0(1)M, refer to:
For more information about general IOS software releases, refer to
Service prices for Cisco products are subject to change after the product End of Sale date.
The Cisco Takeback and Recycle program helps businesses dispose properly of surplus products that have reached their end of useful life. The program is open to all business users of Cisco equipment and its associated brands and subsidiaries. For more information, go to:

For More Information

For more information about the Cisco End-of-Life Policy, go to:
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