Cisco Cisco IOS Software Release 15.3(1)S Fascicule
Product Bulletin
© 2014 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.
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Cisco IOS Software Support Timeline Starting with
Software Release 15.3(3)S
Software Release 15.3(3)S
Last updated: May 2014
Introduction
This product bulletin describes the support timeline and end-of-life guidelines for Cisco IOS
®
15S Software.
Cisco IOS 15S Software Release Model
Cisco IOS 15S Software releases are time-based, each with a fixed release date. The schedule specifies three
individual software releases per year at four month intervals.
Figure 1. Cisco IOS 15S Software Release Versioning
New Feature Release Number
Release Train
Major Release Number
Maintenance Rebuild Number
IOS 15
.0(
1
)
S
1
Cisco IOS 15S Software Support
●
Each Cisco IOS 15S Software release is classified as either a Standard-Support or Extended-Support
release
●
Standard-Support Release Details
◦
18 months sustaining support from First Customer Shipment (FCS) with three scheduled rebuilds
◦
Rebuilds are typically released at 3-, 3-, and 6-month intervals after FCS
●
Extended-Support Release Details
◦
48 months sustaining from FCS with eight scheduled rebuilds. The timing of these rebuilds is typically
released at 3-, 3-, 4-, 4-, 4-, 6-, 6-, and 6-month intervals after FCS
●
Cisco makes no commitment to introduce software fixes to the affected Cisco IOS 15S Software release
after the final planned rebuild release
●
Optional Rebuilds: Software problems found after the final scheduled rebuild release will be fixed in a
subsequent major Cisco IOS 15S Software release. An exception may arise to address mission-critical,
high-severity software fixes and security vulnerabilities, possibly resulting in an additional rebuild release,
after the final scheduled rebuild date (but before the end-of-software maintenance milestone), on an as-
needed basis at the discretion of Cisco. No software fixes will be introduced to the affected Cisco IOS 15S
Software release after the end-of-vulnerability and security (EoVS) milestone.
●
After the EoVS milestone, the Cisco Technical Assistance Center (TAC) will provide customer support on
the affected Cisco IOS 15S Software release, within the guidelines set by existing Cisco end-of-life policies,
at the end-of-software-maintenance milestone.