Could anyone know what the difference between IOS 12.4 and 12.4T is ? What is the meaning of T ?
Thanks a lot
Leung Che Man
This answer your question
Q. What is the relationship between major releases and new technology releases?
A. Technology releases (ie: Release 12.3T) are those Cisco IOS Software releases that introduce new features, functionality, and hardware support. A major release (ie: Release 12.4) consolidates features/functions previously introduced in technology releases. A major release emphasizes stability and reliability.