I often want to see HTTP usage for a particular link. I noticed that when I go to NTA summary, one of the default graphs has HTTP traffic right there and it can be broken down by individual links as seen here: http://grab.by/4xOa
Most of my sites export flows from their internal VLAN interfaces since all traffic passes through them. When I click on one of them, no graphs show up. I get the message: "No data for selected time period."
Here's the weird part, though. If I change the traffic direction to "both", I get data. ONLY both works, neither ingress nor egress do.
I don't have this problem on regular interfaces - it seems to be happening only on VLANs.
Anyone have any idea whats happening here?