Hi Ramesh, this is what Cisco says about Netflow:
´What Is a Flow? A flow is identified as a unidirectional stream of packets between a given source and destination—both defined by a network-layer IP address and transport-layer source and destination port numbers. Specifically, a flow is identified as the combination of the following seven key fields: Source IP address Destination IP address Source port number Destination port number Layer 3 protocol type ToS byte Input logical interface (ifIndex) These seven key fields define a unique flow. If a flow has one different field than another flow, then it is considered a new flow. A flow contains other accounting fields (such as the AS number in the NetFlow export Version 5 flow format) that depend on the version record format that you configure for export. Flows are processed in a NetFlow cache. NetFlow only supports accounting for IP unicast traffic flow.´ That means that even one packet that travels between a source and a destination device is considered a flow. Netflow is only supported on routers, since it needs to look at IP information in the packets. The following platforms support Netflow: Cisco 7000 series VIP Cisco 7500 series VIP Cisco 7000 series Cisco 1400 series Cisco 1600 series Cisco 2500 series Cisco 2600 series Cisco 3600 series Cisco 4000 series Cisco AS5800 There is a really good article on the Cisco site about Netflow, go to: http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/netflsol/nfwhite.htm#xtocid286794 Regards, Georg Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35207&t=35199 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
