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New Member

Reducing bandwidth!

I have a UUNet T1 which is billed on a monthly aver. usage. I need to try and keep your usage down below 256k to stop excessive charges.

Is there a way to throttle down the bandwidth on an interface?


New Member

Re: Reducing bandwidth!

How does the carrier determine usage ?

If its a T-1, at least in the colonies, you get 1.544 mb...No traffic measurement is done.

New Member

Re: Reducing bandwidth!

You can limit the bandwidth under serial interface , if you have internal CSU/DSU then you need to make serial interface by using command

Controller t1 1/0

channel-group 1 time-slots <# of time slots> speed 64

That will create serial interface for you and let say you configured full T1 then what you can use Generic traffic shaping and limit the interface bandwidth to 256 or less so you won't burst above that .

The command syntax in Cisco router would be

Int serial 1

traffic-shape rate

Explanation is below :

< - - - This is GTS

bit rate: the average rate the router allows to transmit

burst-rate: the bit rate per interval a router will transmit; this rate times the number of interval should be the bit rate

excess-rate: the bit rate a router will transmit in the event of burst traffic that needs to transmit


New Member

Re: Reducing bandwidth!


Use rate-limit command....


New Member

Re: Reducing bandwidth!

If you want all traffic constrained, then the Generic Traffic Shaping rate feature will help. You specify the rate you want in bits/sec, and you get both controlled bandwidth and graceful queueing with WFQ.


interface s0

traffic-shaping rate 256000 25600 0

This will allow a 1/10th second granular average of 256k. You won't go above that rate.

If you want to constrain just some traffic to that rate, then you'd need to define an ACL for the permitted traffic, and apply

traffic-shaping group xxx 256000 25600 0

Richard Berke

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