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IM having same issue. we have one router with 50 VPN tunnels so when I enable cache flow on an Ethernet Interface, all 50 VPN tunnels are added
Same problem here as well, using the exact Cisco Netflow commands suggested in the Solarwinds Netflow setup docs.
The examples given are to some extent generic and meant to get you on your way with Netflow statistics. There are caveats for various hardware/IOS combinations. 4500 series routers for example may require "ip flow ingress" to be changed to "ip flow ingress infer-fields". For more information you can refer to Cicso here http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_guide_chapter09186a0080233fe4.html#wp1021229
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I did verify with Cisco that when NetFlow is enabled on an interface, it will show stats for the entire device and all interfaces on the device. It doesnt make much sense to me that you enable the commands on an interface level but it affects all interfaces on the system.
The TAC engineer gave me this link for some additional NetFlow information.