Platforms & Cisco IOS Versions that currently support CISCO-NBAR-PROTOCOL-DISCOVERY-MIB
are
Cisco 1700 Series Router since Release 12.2(2)T
Cisco 2600, 3600, 7100, 7200 Series Routers since Release 12.1(5)T
Cisco 3700 and 7500 Series Routers since Release 12.2(8)T
The following Platforms also support NBAR:
To know the supported IOS versions check here