NBAR is capable of detecting applications/flows through a router. It is limited in the applications that it can recognise, PDLM's can be added to NBAR allowing recognition of additional applications. NBAR is simpler than access-lists and also supports HTTP MIME types, and stateful connections.
NBAR can be integrated into QoS to identify traffic and classify, using protocol-discovery.
ip nbar pdlm name_of_pdlm - Add a new PDLM located in flash
ip nbar port-map name_of_protocol tcp/udp port_number - map protocol to port
ip nbar protocol-discovery - enable NBAR protocol discovery on an interface
match protocol protocol_name - identify traffic in class-map using NBAR.
http://www.cisco.com/pcgi-bin/tablebuild.pl/pdlm - Download PDLMs
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