[j-nsp] Rate limiting

[Paolo Autore]

Timur
I have an open case with Jtac concerning rate limiters (2008-1210-0681)
For some reason the algorithm used is not letting traffic reach the
configured bandwith



-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Timur
Ibragimov
Sent: Friday, December 26, 2008 9:40 AM
To: Tom Storey
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Rate limiting

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

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