Cisco Cisco IOS Software Release 12.4(22)T Fascicule
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Release 12.4T Upgrade Paths
Release 12.4T
Maintenance Release
12.4 or 12.4(15)T
•
Releases 12.3,
12.3T, or prior
releases *
12.3T, or prior
releases *
For new features and hardware support, and
ongoing software maintenance
ongoing software maintenance
For software maintenance only; features
supported based on prior T release (12.3T *)
supported based on prior T release (12.3T *)
*
Cisco IOS Software Release 12.3 and 12.3T have reached End of Software Maintenance
:
** Cisco has announced extended support for Release 12.4(15)T: