Bandwidth controlling problem

[mrmozaffari]

i have a 3550 catalyst and i configured it for bandwidth controlling

i have used POLICE command

its work fine and i saw it limit the bandwidth

but there is a little problem

when i limit the bandwidth at 1024000 and i useing all the bandwidth and monitor the bandwidth i see it shows the network uses half bandwidth.

[Georg Pauwen]

Hello,

can you post your configuration ?

Regards,

GP

[mrmozaffari]

mls qos

access-list 150 permit ip any any

class-map bandwidth

match-all access-group 150

policy-map bandwidth

class bandwidth

police 1024000 128000 exceed-action drop

interface fa0/0

service-policy input bandwidth

thats all

when i monitor the bandwidth usage at input

i see its 512k

and if i configure it with the number 2048000 256000

then it uses 1024k

thanks.

Regards Mozaffari

[dalara]

Maybe i not understand your question, but you are seeing 512k or 512M.

with the police 1024000 128000 exceed-action drop you are telling to the switch that the burst size is (128000*4000)= 512000000 and with 2048000 256000 you have a burst of (256000*4000)= 1024000000, since de data traffic is not constant the switch always will use the burst parameter as its max. posible transmission value. The 1024000 and 2048000 are only rate values not max. values.

Regards

Dan

[Florin Barhala]

Hi guys,

I read this thread but couldn't figure it out:

with the police 1024000 128000 exceed-action drop you are telling to the switch that the burst size is (128000*4000)= 512000000

Is it true? What is the formula behind this computation?

[amikat]

Hi,

Will you please mention of what sort of traffic you are using for your test and how you measure the throughput.

Thanks & Regards,

Antonin

[aoladunjoye · Accepted solution]

What is the duplex setting of your port link? half or full? If half!, you'll only be able to do to half the bandwidth setting and otherwise.

Thanks

gbemi.