Problems with ASA 5520 netflow results :(

http://www.networking-forum.com/viewforum.php?f=35

Dear brothers,

I have the first diagram like this:

[img]http://i2.upanh.com/2013/1007/02//57728522.capture1.png[/img]

I configured netflow commands on the routers and built a netflow collector inside. The netflow results are normal in 3 months.

Last week, I change the topo to something like this:

[img]http://i8.upanh.com/2013/1007/02//57728519.capture.png[/img]

Because the Switch Leased Line 3750 doesn't support netflow commands, I upgrade iOS of ASA Devices to version 8.25 and activate the netflow features of ASA. But the netflow results on my netflow colecter are subnormal when I see the GRE_APP traffic IN & OUT is so so huge. :( I can't understand what happened.

Please give me your ideas, advices or solutions to my case.
Thank you so much.