From: John Neiberger (neiby@xxxxxxxxxx)
Date: Wed Apr 03 2002 - 00:56:12 GMT-3
Now I'm getting even more confused about FRTS. There seems to
be a large discrepancy between configuring the map class using
the CIR, MINCIR, Be, and Bc values and when you configure it
using frame-relay traffic-rate.
Let's say we want to allow an average rate of 64000 and a burst
of 64000 bits per second, using the first method we'd get the
following:
frame-relay CIR 64000
frame-relay Bc 8000
frame-relay Be 8000
This translates to an average rate of 64000 (the CIR) which
translates to Bc of 8000 per interval (with 8 intervals of 125
ms.) The excess burst size is a per-interval figure as well
just like Bc so the total burst per second is 64000. Here's
what this looks like on the router (reformatted to fit):
Target Rate: 64000 (CIR)
Byte Limit: 2000
Sustained bits/int: 8000 (Bc)
Excess bits/int: 8000 (Be)
Interval: 125 ms
Now, let's try this with the other method, using frame-relay
traffic-rate.
I've seen this used recently in a way that I now think was
incorrect. I thought the parameters went like this:
frame-relay traffic-rate CIR PEAK
If that were the case, in our example we'd use 'frame-relay
traffic-rate 64000 128000'. Here's what that looks like to the
router:
Target Rate: 64000
Byte Limit: 9000
Sustained bits/int: 64000 (per interval!)
Excess bits/int: 64000 (again, per interval)
Interval: 125 ms
This obviously isn't what we were expecting since it would
result in a true peak of 1088000 bits/sec, when we were
shooting for a peak of 128000.
If we try 'frame-relay traffic-shape 64000 72000' we get a
little closer:
Target Rate: 64000 (CIR)
Byte Limit: 2000
Sustained bits/int: 64000 (Bc) Per Interval!!
Excess bits/int: 8000 (Be)
Interval: 125 ms
Here we would end up with a true peak traffic rate of 640kbps!
What it comes down to is this: I can't make sense of the frame-
relay traffic-rate command. Do any of you use it? If so, and
it makes sense to you, could you explain it? ;-)
If we specify the individual values I can get exactly what I'm
looking for. With this other command, I don't see how to make
it useful.
Any thoughts?
Thanks,
John
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