traffic appears in wrong direction

[ebroo]

HI all - I am trying to determine why an Interface I monitor with Cacti seems to report the traffic as flowing in the wrong direction.

Given an edge router - with a hssi interface and two fast ethernet -

The hssi interface has monitors for total bandwidth 95th percentile etc - this is connected to the internet -

The two fast ethernet interfaces are likewise graphed - one interface goes to network a the other to network b

Both ethernet interfaces use the Hssi as thier default gateway to the net -

My problem is that looking at my hssi interface I see a traffic spike listed as outbound - fine -

I look at fastethernet interface A and I see a matching spike of INBOUND traffic -

The fast ethernet interface B has no matching spike -

So I know that the traffic should have been leaving or outbound from fast ethernet A
The HSSI interface shows the traffic as being outbound not in -


Why would the ethernet interface report this as outbound?

Any thoughts appreciated - graphs attached for viewing pleasure




TIA

Edward
ebroo@phillips.com

[ophelan]

This is exactly how one would expect it to appear. Keep in mind that all data collection is from the point of view of the router, thus if network A is sending data to the internet, it appears as INBOUND traffic from network A, then OUTBOUND traffic to the internet.