08-02-2008 03:45 PM - edited 03-15-2019 12:22 PM
Hi,
There is so much controversy on how to set certain rate with traffic policing that it is amazing!
I need to set a class-based policer to allow 5Mb/s on Ethernet link with burst up to 10Mb/s.
What values are needed for it?
Thanks,
David
08-02-2008 06:18 PM
read the following i think its applicable to ur question
acccording to cisco press:
CB Policing: Dual Token Bucket (Dual Rate)
Dual Token Bucket CB Policing with a single rate provides a very useful function. After a period of low activity, a larger burst of data can be considered to either conform to or exceed the traffic contract, without violating the traffic contract. Because data tends to be bursty, the idea of a policer with bursting capability makes a lot of sense
Dual Token Bucket with Dual-rate policing also provides a bursting feature, but with dual-rate, the CB Policer allows you to essentially set two different sustained rates. Packets that fall under the lower ratethe Committed Information Rate (CIR)conform to the traffic contract. A second sustained ratethe Peak Information Rate (PIR)defines a traffic rate above CIR. Packets that happen to exceed the CIR, but fall below PIR, are considered to exceed the contract, but not to violate it. Finally, packets beyond even the PIR are considered to exceed the contract
police {cir cir} [bc conform-burst] {pir pir} [be peak-burst]
[conform-action action [exceed-action action [violate-action action]]]
for ur question should be somthing like:
police cir 50000 pir 100000
where the CB Policing Defaults for Bc and Be
Bc=CIR/32
When dual-rate policing, For Be, IOS using a slightly-different formula, with the same intent, but based on PIR
Bc= (PIR*.25 second)/(8 bit/byte)= PIR/32
good luck
Please, if helpful Rate
08-02-2008 06:46 PM
Hi,
So could it also be
police 5000000 39062
Where 39062 (in bytes) is:
10000000bit(PIR) / 8 = 1250000byte(PIR)
and then according to your formula
1250000 / 32 = 39062 bytes
08-02-2008 06:52 PM
but without the words cir and pir in the command it will not be dual rate policer
this will be a policer with its burst
like the CIR and Bc
so u need to follow the coman stracture that sent u and in the command stracture there is a curly brckets these are must and other option
so i sent u the calculation formula if u dont chane the optional numbers such as Bc and Be
good luck
please rate if helpful
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: