[j-nsp] Rate limiting

[Timur Ibragimov]

Tom Storey wrote:

> A burst size of 1.5kbps as you have configured in your example only allows
> traffic to increase at 1.5 kilobits each second, not a hell of a lot. At
> that rate it would take upto 1000 seconds, i.e. 16 minutes to reach the
> full 1.5 megabits you are wanting to supply...
>   
I thought that burst-size-limit is measured by bytes (not 1.5kbps, but 1.5KB) and only important when the traffic flow is above the limit of 1500 kbps
according to the token-bucket algorithm.
 
Well in my case packets begin dropping at even lower rates.


> That is going to cause considerable packet loss as the permittable traffic
> level is gradually increased.
> Im no expert on the subject, particularly when it comes to Juniper, but I
> have found on my Ciscos that a burst size of 5-10% of the CIR works pretty
> well for TCP traffic on multi megabit policers. For sub megabit policers a
> minimum of 64kbit works pretty well. Though having said that Ive never
> really looked into the loss figures for any of these policers, so I dont
> know how well they perform.
> Tom
--

Best regards,

Timur Ibragimov