Main difference between Cisco IOS versions 12.0 & 15.0

[EZRA SHYAM]

Dear All,

Can some one explain main difference b/w Cisco IOS Versions 12.0 and 15.0?

Regards,

Ezra..

[Richard Burts]

Ezra

12.0 is older and 15.0 is newer. Some new features are introduced in newer releases that are not in older releases. Most features in the older releases will be in the newer releases, though sometimes a feature will be dropped in newer releases because it is no longer useful.

HTH

Rick

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[Joseph W. Doherty]

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Cisco's main site has a IOS version feature comparison tool.  If you have access to it, you could compare 12.0 vs. 15.0.