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Understanding SRR shape and limit

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Jul 13th, 2009
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I just want to know if I have understood this correctly. If I have a port connected at 100Mb Full duplex with the following config:

srr-queue bandwidth shape 0 2 0 0

srr-queue bandwidth limit 18

Would this limit bandwidth to 18Mbit and also limit Queue 2 to 50% of 18Mbit which would be 9Mbit?

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stretchlad Tue, 07/14/2009 - 06:35
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I have tested this in a lab and bot bandwidth shape and limit work off the physical speed rather than shape working off what limit is set at so my config was wrong. No need for a response now.

d.calton Mon, 09/28/2009 - 08:43
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So, to clarify, when you tested, did you get 18M, because the srr-queue bandwidth shape cmd was 50% and the srr-queu bandwidth limit command was only 18%, or did the shape command override the limit cmd?

stretchlad Tue, 09/29/2009 - 00:53
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The shape command in this scenario as it is allows 1/2 or 50% of the physical bandwidth which was 100Mb so 50Mb. As I have a limit of 18Mb it would peak at 18Mb when in relaity I only wanted it to use 9Mb.

So bandwidth shape 0 11 0 0 would give 9Mb for queue 2 which is what I wanted to achieve. I still used the bandwidth limit to limit the overall port utilisation to 18Mb but wanted a cap on an individual queue also.


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