Cisco Cisco IOS Software Release 12.4(4)T Guide D’Information
Data Sheet
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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Release 12.4 consolidates the new technology releases from the previous release family. For
example, Release 12.4 is a consolidation of all features and hardware support in the Release
12.3T
example, Release 12.4 is a consolidation of all features and hardware support in the Release
12.3T
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family. Release 12.4 receives software fixes on regular basis, but no new features or
hardware support.
Figure 1 shows the relationship between Release 12.4T and Release 12.4.
Figure 1. Release 12.4T and Release 12.4 Relationship
●
First Commercial Shipment (FCS) is the date at which the release is first available to
customers on Cisco.com
Q.
What is the relationship between Release 12.4T and Release 12.4(n)T?
A.
The numbering scheme with a T suffix (ie: 12.4T) is applied to a family of new technology
releases. The formal numbering scheme is 12.4(n)T, where ‘n’ represents the release number
(ie: 12.4(4)T). New features, software improvements, and other enhancements are rolled out
via the next new technology release at regular intervals, in line with market requirements and
the strict Cisco quality schedule.
Q.
How do Release 12.4(n)T releases differ from each other?
A.
Each Cisco IOS Software new technology release is built upon the previous release. It
integrates leading edge new technologies and features, new hardware support, and software
maintenance.
Figure 2 below shows the relationship between Major Release 12.4T, individual 12.4(n)T new
feature releases, and ongoing maintenance (additional software fixes) through release
rebuilds of individual 12.4T releases.
feature releases, and ongoing maintenance (additional software fixes) through release
rebuilds of individual 12.4T releases.
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Cisco IOS Software Release 12.3T has reached End of Sale and End of Software Maintenance:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6947/ps5187/prod_end-of-
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