What is a difference between the Cisco IOS 12 and IOS 15 versions?
- The IOS 12 version has commands that are not available in the 15 version.
- The IOS version 15 license key is unique to each device, whereas the IOS version 12 license key is not device specific.
- Every Cisco ISR G2 platform router includes a universal image in the IOS 12 versions, but not the IOS 15 versions.
- IOS version 12.4(20)T1 is a mainline release, whereas IOS version 15.1(1)T1 is a new feature release.
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