Cisco IOS Software Releases 12.1 Mainline

12.1(5)XU Product Bulletin, No. 1250

Product Bulletin, No. 1250

Cisco IOS X-Release 12.1(5)XU


This Product Bulletin describes the content and delivery information concerning Cisco IOS(TM) software release 12.1(5)XU. 12.1(5)XU is a short lived Early Deployment (ED) release parented to 12.1(5)T and supporting the Cisco cva120 platform. This release contains all new features delivered in 12.1 up to 12.1(5)T.

The platform and features delivered with this ED release will be immediately incorporated into Cisco IOS 12.2(2)T and subsequent Cisco IOS 12.2T releases. It is important to note that there are no planned maintenance releases for this XED release. In addition, please note the migration path to the latest T release. Customers should prepare to upgrade using this migration path.

New Features in Cisco IOS Release 12.1(5)XU

Cisco IOS XED release provides support for the new CVA120 platform. For more details on the CVA120 platform go to:

Any XED release of software should be utilized first in a test network before being deployed in a production network.

Detailed Information

For more detailed information about the platforms being delivered in 12.1(5)XU, please reference the following documents:


Cisco IOS software release xx.x(x)Xx follows the standard Cisco support policy as indicated in the following link.

Product Numbers

Table 2: Cisco IOS Release 12.1(5)XU Feature Sets, Images, and Memory Recommendations

  • Platform Software Feature Set Product Code Image Flash DRAM
    cva 120




    12 MB

    24 MB

Download Information

Customers can download Cisco IOS Release 12.1(5)XU software from Cisco Connection Online (CCO) in the Software Image Library.