2 Replies Latest reply on Jun 24, 2010 3:10 PM by jswan

    Netflow Tunnel Interfaces

      Hey Everyone,

      I apologize if this question has been asked/answered before but I have been unable to find the solution.

      Our problem is gathering Netflow statistics from Cisco Tunnel Interfaces. Physical interfaces are reporting back to Netflow properly - Our problem is only with Tunnel Interfaces. Is anyone aware of any tricks/tips that are necessary for this to work? We have tried different combinations of ip flow ingress/egress/route-cache commands without any luck. When we run the 'show ip flow interface' command we do not see the Tunnel interface listed. Is this a sign that the interface is not gathering statistics? Could this be an IOS version issue? Any assistance would be appreciated!

      We have the following setup (simplified) on a Cisco 2811.

       

      Interface Tunnel0

      ip flow ingress
      ip flow egress
      ip route-cache flow

      Interface Fa 0/0

      ip flow ingress
      ip flow egress
      ip flow-cache flow


      ip flow-export source FastEthernet0/1
      ip flow-export version 5
      ip flow-export destination (IP Address) 2055
      ip flow-top-talkers


      *********#show ip flow interface
      FastEthernet0/0
        ip route-cache flow
        ip flow ingress
        ip flow egress


      *********#show ip flow export
      Flow export v5 is enabled for main cache
        Export source and destination details :
        VRF ID : Default
          Source(1)       (IP Address) (FastEthernet0/1)
          Destination(1)  (Server IP Address) (2055)
        Version 5 flow records
        1374 flows exported in 1230 udp datagrams
        0 flows failed due to lack of export packet
        3 export packets were sent up to process level
        0 export packets were dropped due to no fib
        0 export packets were dropped due to adjacency issues
        0 export packets were dropped due to fragmentation failures
        0 export packets were dropped due to encapsulation fixup failures

       

      Thank You!