• The networking device must be running a Cisco release that supports Flexible NetFlow. IPv4 Traffic • The networking device must be configured for IPv4 routing. • One of the following must be enabled on your device and on any interfaces on which you want to enable Flexible NetFlow: Cisco Express Forwarding or distributed Cisco Express Forwarding. IPv6 Traffic • The networking device must be configured for IPv6 routing. • One of the following must be enabled on your device and on any interfaces on which you want to enable Flexible NetFlow: Cisco Express Forwarding IPv6 or distributed Cisco Express Forwarding.
Restrictions for Flexible NetFlow The following are restrictions for Flexible NetFlow: • Flexible NetFlow is not supported on the Layer 2 port-channel interface, but is supported on the Layer 2 port-channel member ports. • Flexible NetFlow is supported on the Layer 3 port-channel interfaces and member ports but not on both at the same time for the same traffic type and direction. • Flexible NetFlow Version 9 and Version 10 (IPFIX) export formats are supported. Flexible Netflow Version 5 Export Protocol is also supported. However, if you have not configured the export protocol, Version 9 export format is applied by default.
• Flexible Netflow without AVC and other NBAR or AVC enabled features cannot be configured at the same time on the same interface. Use AVC Flexible Netflow with these features. For information on how to configure AVC Flexible Netflow, refer "Configuring Application Visibility and Control in a Wired Network" section of the System Management Configuration guide. • Layer 2, IPv4, and IPv6 traffic types are supported. A unique flow monitor for each traffic type can be applied for a given interface and direction. Multiple flow monitors for the same traffic type cannot be applied to an interface in the same direction.
• Layer 2, VLAN, Layer 3 and SVI interfaces are supported, but the device does not support tunnels. • The following NetFlow table sizes are supported: • Depending on the switch type, a switch will have one or more forwarding ASICs, with multiple cores per ASIC. The capacities listed in the above table are on a per-Core/per-ASIC basis. Configuring Flexible NetFlow Restrictions for Flexible NetFlow Trim Level Ingress NetFlow Table Egress NetFlow Table Network Essentials 32 K 32 K Network Advantage 32 K 32 K Configuring Flexible NetFlow 2