Chapter 10. NBAR

This chapter is an overview of the Network-Based Application Recognition (NBAR) feature in Cisco IOS. It helps you decide in which situations NBAR is the appropriate mechanism for accounting and performance management. Based on concrete examples, you will be able to identify the appropriate CLI commands and MIB functions and quickly get NBAR setups operational.

NBAR provides network traffic classification. NBAR recognizes a wide variety of applications by inspecting the IP packet’s payload up to OSI Layer 7. It can identify web-based and other difficult-to-classify applications, which can be static (using fixed TCP or UDP port numbers) or stateful (dynamically assigning TCP or UDP port numbers). Figure 10-1 illustrates the parts ...

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