On Nov 4, 2004, at 11:44 AM, Mike Lieberman wrote:
In the attached GIF there are two unique links in 'red' connected to a
router. Each link is defined as 1.536Mb bandwidth. Each is actually a Point
to Point Sub-Interface of the SAME physical T1 using Frame-Relay. So what
you are looking at CAN'T really happen. Unfortunately we have seen this
behavior in InterMapper for some time now. I really think this needs to be
fixed.
Mike:
Looking at your picture, I can imagine one way that what you are seeing can happen. I will need more information, including the contents of the status windows for both sub-interfaces, to check my hypothesis. Once we figure out what information InterMapper really has, we can go from there. I agree with you that InterMapper's depiction of the situation is ambiguous.
Your physical T1 interface is Full-Duplex; it can transmit 1.536 MB in both directions simultaneously. For Full-Duplex interfaces, InterMapper calculates the "reported utilization" of the interface by first calculating the utilization of incoming traffic, then the utilization of outgoing traffic, and using the maximum of these two values.
Is it possible that one sub-interface has an incoming utilization > 90% and the other sub-interface has an outgoing utilization > 90%? This would account for both sub-interfaces appearing orange in InterMapper.
Thanks,
Bill Fisher Dartware, LLC
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