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.
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
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.
“Catalyst 8500 Series - Deep Dive”
This event will have place on Tuesday 17th, November 2020 at 10hrs PDT
The Catalyst 8500 Series Edge Platforms are built with the highly programmable, third-generation Cisco Quantum Flow Processor and designed for ...
“Catalyst 8000 Edge Platforms Family Overview”
This event will have place on Wednesday 4th, November 2020 at 10hrs PDT
Designed for an intent-based networks, the Cisco Catalyst 8000 Edge Platforms family offers best-in-class networking and security ...
I'm currently redistributing OSPF to BGP and setting a local pref on the routes. Currently this works fine and having no issues. ip prefix-list ospf-routes seq 10 permit 172.16.100.0/24
route-map ospf-bgp permit 10
match ip address prefix-list ...
Cisco SD-WAN Cloud OnRamp allows you to simplify and secure connectivity to cloud applications and public clouds. Interested in testing out the latest Cisco Cloud OnRamp solutions?
Sign up to try out various use cases with the Cisco SD-WAN Cloud ...
“Use Serviceability Features to Troubleshoot your Cat9K as a Cisco TAC Engineer”
This special event is open only to Cisco Customers and Partners.
Many pages in the Cisco Community are accessible only to Cisco customers, partners, or logged in ...