I have configured NTA on my router 3800 series, when i try to see the details of the interface all it show their details but only one of them cant be seen and it show me that " Details for interface 'Tunnel21' on 'Router xxxx' are note available because NetFlow and CBQoS data are not available."
The Configuration on the interface is as below
interface Tunnel21
description ### GRE tunnel to Branch ###
ip address y.y.y.y 255.255.255.252
ip flow ingress
ip flow egress
tunnel source GigabitEthernet0/1.628
tunnel destination x.x.x.x
Can any one help me to solve this problem.
Thanks in advance.