Burst above cir on a serial connection

Unanswered Question
Feb 4th, 2009

I have a ds3 serial connection with at&t on 45mg line. Our cir on the serial is a "dsu bandwidth 10500". My other bandwidth statement is "bandwidth 10500"

I was told by AT&T that we can burst up to 45mg if available. Can this be done on a serial connection?

I have this problem too.
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Paolo Bevilacqua Wed, 02/04/2009 - 08:12

CIR really applies to frame-relay, but from your description, it's not clear if you have that or not.

If it is a clear-channel point-to-point circuit, you can take out any dsu bandwidth and fully use 45 the 45 mbps. Bandwidth statement never influence speed and is for information only.

mamentt Wed, 02/04/2009 - 08:16

Correct it is a ppp conection. But the at&t tech said we needed the "dsu bandwidth 10500" statement to match their


Paolo Bevilacqua Wed, 02/04/2009 - 08:22

They are limiting traffic toward you to 10.5 mbps, and that is a contractual aspect, that is you have to pay more to get more speed.

You can try removing the dsu statement on your side and possibly you will be able to send more than 10.5 mbps toward them, but they can still enforce the speed limitation by other means, so your excess traffic is dropped anyway.

So possibly the person that mentioned you can burst up to 45 mbps is incorrect.

mamentt Wed, 02/04/2009 - 08:30

Thank you for your help. I could not find too much info on the serial type connections. I will give it a try to remove the bandwith commands.


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