Explanation/Reference:
Explanation:
Configuring NetFlow
Perform the following task to enable NetFlow on an interface.
SUMMARY STEPS
1. enable

2. configure terminal

3. interface type number

4. ip flow {ingress | egress}

5. exit

6. Repeat Steps 3 through 5 to enable NetFlow on other interfaces.

7. end

DETAILED STEPS
Command or Action
Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
Enter your password if prompted.

Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
interface type number
Example:
Router(config)# interface ethernet 0/0
Specifies the interface that you want to enable NetFlow on and enters interface configuration mode.
Step 4
ip flow {ingress | egress}
Example:
Router(config-if)# ip flow ingress
Enables NetFlow on the interface.
ingress--Captures traffic that is being received by the interface

egress--Captures traffic that is being transmitted by the interface

Step 5
exit
Example:
Router(config-if)# exit
(Optional) Exits interface configuration mode and enters global configuration mode. Note You need to use this command only if you want to enable NetFlow on another interface.

Step 6
Repeat Steps 3 through 5 to enable NetFlow on other interfaces.
This step is optional.
Step 7
end
Example:
Router(config-if)# end
Exits the current configuration mode and returns to privileged EXEC mod ReferencE.
http://www.cisco.com/c/en/us/td/docs/ios/netflow/configuration/guide/12_2sr/nf_12_2sr_book/cfg_nflo w_data_expt.html