How to Configure Original Netflow on Cisco IOS

How to Configure Original Netflow on Cisco IOS

NetFlow is a Cisco IOS application that provides statistics on packets flowing through the routing devices in the network.
NetFlow is the standard for acquiring IP operational data from IP networks.
NetFlow provides data to enable network and security monitoring, network planning, traffic analysis, and IP accounting.

NetFlow identifies packet flows for both ingress and egress IP packets.
It does not involve any connection-setup protocol, either between routers or to any other networking device or end station.
NetFlow does not require any change externally--either to the packets themselves or to any networking device.
NetFlow is completely transparent to the existing network, including end stations and application software and network devices like LAN switches.
Also, NetFlow capture and export are performed independently on each internetworking device; NetFlow need not be operational on each router in the network.

NetFlow Flows
A NetFlow network flow is defined as a unidirectional stream of packets between a given source and destination.
The source and destination are each defined by a network-layer IP address and transport-layer source and destination port numbers.
Specifically, a flow is defined by the combination of the following seven key fields:
1. Source IP address
2. Destination IP address
3. Source port number
4. Destination port number
5. Layer 3 protocol type
6. Type of service (ToS)
7. Input logical interface

CONFIGURE
conf t
!Configuring NetFlow(NetFlow on the interface)
conf t
interface Gi0/1
ip flow ingress
!Configuring NetFlow Data Export Using the Version 9 Export Format
ip flow-export destination 10.10.1.1 2055
ip flow-export version 9
ip flow-export source Gi0/0
!
!Configuring NetFlow Top Talkers
ip flow-top-talkers
top 10
sort-by bytes
cache-timeout 30000
end
wr

VERIFY
show run | sec flow
show ip cache flow
show ip flow top-talkers !do a continous ping from R2 to PC 1: ping 10.10.1.100 repeat 2147483647
show ip flow interface
show ip cache verbose flow
show ip flow export
show ip flow export template

References:
Cisco IOS Original NetFlow Overview:

Configuring Original NetFlow:

Best Practice / Highlights:

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