and Control (AVC) classifies applications using deep packet inspection
techniques with the Network-Based Application Recognition
engine, and provides application-level visibility
and control (QoS) in wireless networks. After the applications are recognized,
the AVC feature enables you to either drop, mark, or police the data traffic.
AVC is configured by defining
a class map in a QoS client policy to match a protocol.
Using AVC, we can
detect more than 1000 applications. AVC enables you to perform real-time
analysis and create policies to reduce network congestion, costly network link
usage, and infrastructure upgrades.
You can view list
of 30 applications in Top Applications in Monitor Summary section of the UI.
Traffic flows are analyzed
and recognized using the NBAR2 engine at the access point. For more information
about the NBAR2 Protocol Library, see
The specific flow is marked with the recognized protocol or application, such
as WebEx. This per-flow information can be used for application visibility
using Flexible NetFlow (FNF).
AVC QoS actions are applied
with AVC filters in both upstream and downstream directions. The QoS actions
supported for upstream flow are drop, mark, and police, and for downstream flow
are mark and police. AVC QoS is applicable only when the application is
classified correctly and matched with the class map filter in the policy map.
For example, if the policy has a filter based on an application name, and the
traffic has also been classified to the same application name, then the action
specified for this match in the policy will be applied. For all QoS actions,
Supported AVC Class Map and Policy Map Formats.
Visibility and Control Protocol Packs
Protocol packs are a
means to distribute protocol updates outside the controller software release
trains, and can be loaded on the controller without replacing the controller
Visibility and Control Protocol Pack (AVC Protocol Pack) is a single compressed
file that contains multiple Protocol Description Language (PDL) files and a
manifest file. A set of required protocols can be loaded, which helps AVC to
recognize additional protocols for classification on your network. The manifest
file gives information about the protocol pack, such as the protocol pack name,
version, and some information about the available PDLs in the protocol pack.
The AVC Protocol
Packs are released to specific AVC engine versions. You can load a protocol
pack if the engine version on the controller platform is the same or higher
than the version required by the protocol pack.