[c-nsp] Re: Traffic Shaping packet loss

[Kanagaraj Krishna]

Dan,
    I thought that the burst rate only takes into effect once the average 
speed limit is passed. Am i right?

Quoting Dan Martin <dmartin at micromuse.com>:

> So many per unit time.
> 
> It doesn't wait a whole second and then pass or fail the stream.
> 
> It divides a second into some number of parts, figures out how many
> packets or bytes should arrive during that part, and drops the rest.
> 
> That is why your burst setting fixes the problem.  You allow some number
> of packets to arrive at a higher rate than contracted.
> 
> 
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Kanagaraj
> Krishna
> Sent: Monday, September 26, 2005 6:26 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Re: Traffic Shaping packet loss
> 
> Hi guys,
>             I have a setup with a Catalyst 2950 connected to a GigE port
> on 7206VXR. Sub-interfaces are configured on the GigE port for each VLAN
> (dot1Q) that are assigned to each port in 2950. To control the traffic,
> I've added the rate-limit command on the subinterface
> 
> rate-limit input 64000 2000 2000 conform-action transmit exceed-action
> drop
> rate-limit output 64000 2000 2000 conform-action transmit exceed-action
> drop
> 
> It seems that when i do ping test, there are packet losses (even when
> the traffic is low). One thing I realised is that when the burst rate is
> increased, the packet loss decreases. Any idea on why this happens?
> 
> Regards,
> Kana
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-- 
Kanagaraj Krishna
Network Engineer
Network Engineering
Applied Information Management Services Sdn. Bhd.
(AIMS Sdn. Bhd.)
Ground Floor, Menara Aik Hua,
Changkat Raja Chulan,
50200 Kuala Lumpur,Malaysia.

Tel     : +603-20314988 Ext : 395
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Email   : kanagaraj at aims.com.my