The NBAR2 Protocol Pack feature provides an easy way to load a protocol pack, which allows you to update Network-Based Application Recognition (NBAR) protocols on supported devices without having to replace the Cisco software on the device. NBAR2 protocol pack contains a set of signatures that are supported by NBAR.
Protocol packs provide the following features:
They are easy to load.
They are easy to upgrade and downgrade.
They provide only the required set of protocols.
Protocol Pack Compatibility
NBAR2 Protocol packs are released for specific NBAR engine versions. You can load an NBAR2 protocol pack only if the NBAR engine version in the controller platform is the same as or higher than the engine version that the protocol pack is released for. However, you are strongly recommended to use the protocol pack that is the exact match for the engine.
A protocol pack is numbered in a format that is similar to this:
pp-AIR-7.5-(NBAR Engine Number)-(Protocol Pack Version).pack
For example, the Wireless LAN Controller Release 7.5 uses NBAR engine version 13. Hence, protocol packs released for Release 7.5 will have a numbering that is similar to this:
If you try to load an incompatible protocol pack on a controller, it will be rejected with an error message stating that the protocol pack is incompatible with the underlying NBAR software version. Any existing protocol pack on the controller, will remain active.