I don't know about configuring a 6509 but my understanding is you won't receive Netflow data in NTA for a physical interface if that interface is not Layer 3 (doesn't have an IP address) as Netflow is a Layer 3 technology. You will receive the Netflow data for the VLAN sub-interfaces as they are configured with IP addresses. I also believe that if you enable Netflow on a physical interface, it will override the subinterface configuration and collect data from all subinterfaces.
Using the NetFlow Subinterface Support feature, you can enable NetFlow on selected subinterfaces using the ip flow ingress command. If you configure the ip flow ingress command on a few selected subinterfaces and then configure the ip route-cache flow command on the main interface, enabling the main interface will overwrite the ip flow ingress command and data collection will start from the main interface as well as all the subinterfaces. In a scenario in which you configure the ip flow ingress command and then configure the ip route-cache flow command on the main interface, you can restore subinterface data collection by using the no ip route-cache flow command. This configuration will disable data collection from the main interface and restore data collection to the subinterfaces you originally configured with the ip flow ingress command.
Regarding the VLAN statistics/availability, I can only think of the following:
- VLAN statistics collection.
You can disable the collection of interface statistics (traffic utilisation, etc) on a per interface basis in the List Resources configuration window. This may affect the utilisation stats of the interface in NTA.
- Either via the Node Details page or Manage Nodes, locate the node and click List Resources.
- Find the interface and expand the tree by clicking on the + symbol.
- Uncheck the box for "Interface Traffic Statistics". (Physical interfaces also list Interface Error Statistics here as well but I don't believe VLANs will).
- Availability monitoring.
A Solarwinds representative will have to confirm this but I don't believe it is possible to disable the availability monitoring of an interface without making it unmanaged. I think NTA will generate an event saying the node is unmanaged but I don't have anything available to test this with. You could set the interface as unpluggable by editing the interface in Node Management and selecting "Display interface as unplugged rather than down". This won't generate an alert if the interface goes down. On the same settings page, you could also lengthen the time in between polling for availability (up to 32767 seconds, just over 9 hours).
If there is an easier solution to the VLAN statistics/availability monitoring I would also be interested.