The MPLS Egress NetFlow Accounting feature is not supported in Cisco IOS Release 12.2(25)S and later. Use the Egress NetFlow Accounting feature, which captures either IP or MPLS packets as they leave the router.
I haven't found out how to exactly configure this feature because the ip flow egress work is not working.
Netflow was in ingress technology, in which the flows that were captured were flows that entered the interface. Flows leaving the interface were not captured. Also, it was an IP technology, hence non IP traffic were not captured.
With the introduction of MPLS VPN, traffic from remote PEs were recieved on the egress PE as labelled traffic. Hence, they were not captured by Netflow (Without MPLS, enabling netflow on the WAN interface of the egress PE would have allowed the traffic be captured).
MPLS Egress Netflow Accounting patched the situation above by allowing Netflow to capture the flow, when the mpls packet was untagged. This feature was introduced in 12.0(20)S. see
It is configured with the command mpls netflow egress
To make things better, they bettered the netflow technology and allowed it to captured egress traffic. With it capturing outgoing traffic, the mpls egress netflow feature was not needed again. Or to put it in another way, Egress Netflow Accounting, replaced MPLS Egress Netflow. See
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