Hi, NBAR (Network Based Application Recognition) is a stateful Deep Packet Inspection technology available on Cisco IOS and IOS-XE routers. It can examine the L3-L7 payload of router traffic and identify which application the traffic belongs to as well as some associated properties. Examples of applications are Skype, Youtube, bittorrent, citrix etc. This information is used by other router features such as QoS, Flexible netflow etc. to enable application based services (e.g. marking/policing based on application and reporting application information in netflow records sent to the collector). NBAR2 is the next-generation architectural evolution of NBAR. NBAR2 can identify many applications seen in enterprise and service provide networks. New application support is being added constantly. For more information on NBAR2 features, please see: http://www.cisco.com/en/US/partner/prod/collateral/iosswrel/ps6537/ps6558/ps6616/qa_c67-697963.html There was also a session on NBAR2 at Cisco Live London 2012: BRKRST-2065 - Application Visibility Control – NBAR2, QoS, FNF and Insight Reporter. The presented material can be accessed by logging into Cisco Live Virtual.
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