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Net Flow is an IOS feature that is available on many Cisco devices, which tracks the IP traffic that flows across your network, and accelerates the performance of several other IOS features. NetFlow improves the performance of the following IOS features:
Access control lists (ACL)
Netflow Policy Routing (NPR)
Software based encryption on the routers
RSVP
The IOS NetFlow feature tracks the IP traffic that is routed by your Cisco device by using a built-in cache. Tracked information can be retrieved and viewed on-screen using "show" commands, or exported and printed in reports, which enables you to analyze the IP traffic data for a specific time period. Using the NetFlow feature, you can review traffic, trend, billing, and other traffic-related data.
Router-based aggregation (RBA) is available beginning with Cisco IOS Release 12.0(3)T and 12.0(3)S. RBA enables further aggregation on the IP traffic tracked by NetFlow, which both enables NetFlow to scale on high-speed platforms and reduces data processing time.
For detailed features and benefits information about NetFlow Packaging for Cisco IOS 12.0, please access Cisco Connection Online at the following URL:
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Cisco IOS Software Release Version |
Supported NetFlow Export Versions |
Supported Cisco Hardware Platforms |
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12.0 |
v1, v5 |
Cisco 2600, 3600, 4500, 4700, AS5800,7200, 7500, RSP7000, RSM |
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12.0T |
v1, v5 |
Cisco 1000, 1600, 2500, 2600, 3600, 4500, 4700, AS5800, 7200, 7500, RSP7000, RSM |
Support for NetFlow Export v1 and v5 on 1000, 1600, and 2500 platforms is targeted for Cisco IOS software release 12.0(2)T. NetFlow support for these platforms is not available in the Cisco IOS 12.0 mainline release.
Cisco 7200/7500/RSM — Although NetFlow functionality is physically included in all software images for these platforms, customers must purchase a NetFlow Feature License in order to be licensed for its use. NetFlow licenses are sold on a per-node basis.
Cisco 1000/1600/2500/2600/3600/4000/5800 Series — NetFlow functionality is supported only in Plus images for these platforms. Customers are required to purchase an appropriate Plus image in order to utilize NetFlow functionality on these platforms.