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Community Member

Rate-limit burst- 3750

I want to rate-limit a vlan to 200Mbps on a 1Gbps link. All traffic above the 200Mbps should be dropped. I have questions about the burst rates:

1) Are the burst rates (normal and max) optional parameters ?

2) If not, how can they be stated to most strictly enforce the 200mbps limit ?

The equation I've been advised to use for "normal" configuration is:

burst= rate/8 * 1.5

maxburst= burst*2

This equation doesn't seem right for limiting to a strict 200Mbps.

Any good links or ideas would be appreciated.


Community Member

Re: Rate-limit burst- 3750

Does anyone know any good links for understanding the burst vs. the rate-limit

Community Member

Re: Rate-limit burst- 3750

If I read you correctly, you want a hard ceiling at 200M period. Without a burst headdomm..

rate-limit output 200000000 0 0 conform-action transmit exceed-action drop

Not sure If I'd do that... but.

Community Member

Re: Rate-limit burst- 3750


Thanks for the reply...yes, I want a hard ceiling at 200Mbps...why would you hesitate to do that ? Perhaps I misunderstand the burst rate and how it should be used...but have found no clear explanation of how to apply this parameter you have any suggestions, links ?

On a seperate note, I have found no cisco documentation on "rate-limit" command for the 3750, and have begun to wonder if the command is even supported...I know the "rate-limit" command was supported on older switches...What's strange is that the OS is actually accepting the command and seems to be partially working...

I'm running following IOS

WS-C3750G-24TS, 12.2(25)SEB4,C3750-IPSERVICES-M

Originally I thought that the burst-rate was causing a problem, allowing more data than the rate limit, but now I'm wondering if the rate-limit command is doing anything at all

Any thoughts ?



Community Member

Re: Rate-limit burst- 3750

Hi ,Boblutton,

just search the topic about CAR, hope this still help other on 2013 futher.haha....

Recommended Burst Values

Cisco recommends the following values for the normal and extended burst parameters:

normal burst = configured rate * (1 byte)/(8 bits) * 1.5 seconds

extended burst = 2 * normal burst

And other more info. in the link.

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