![]() If you need to increase the size of the global flow hash table, increase the memory of the router. Memory Impactĭuring times of heavy traffic, the additional flows can fill up the global flow hash table. For example, the default cache size for the Cisco 7500 router is 65536 (64K) entries. The default cache size depends on the platform. If you have memory constraints, you might want to preset the size of the NetFlow cache so that it contains a smaller number of entries. Restrictions for Configuring NetFlow and NetFlow Data Export Understand the resources required on your router because NetFlow consumes additional memory and CPU resources. Prerequisites for Configuring NetFlow and NetFlow Data ExportĮnsure that one of the following is enabled on your router, and on the interfaces that you want to configure NetFlow on: Cisco Express Forwarding (CEF), distributed CEF, or fast switching. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. For the latest caveats and feature information, seeīug Search Tool and the release notes for your platform and software release. Your software release may not support all the features documented in this module. NetFlow is emerging as a primary network accounting and security technology. NetFlow is a Cisco IOS application that provides statistics on packets flowing through the router. NetFlow need not be operational on each router in the network. NetFlow capture and export are performed independently on each internetworking device on which NetFlow is enabled. If you want more detailed information about this feature and instructions for configuring NetFlow and NetFlow Data Export, please refer to Configuring NetFlow and NetFlow Data Export. This module is intended to help you get started using NetFlow and NetFlow Data Export as quickly as possible. This module contains the minimum amount of information about and instructions necessary for configuring NetFlow to capture and export network traffic data. Getting Started with Configuring Cisco IOS NetFlow and NetFlow Data Export
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