03-25-2013 08:35 PM - edited 03-07-2019 12:28 PM
Hi,
How do we calculate the throughput of a switch. If the specification is XXXX. If we use only two ports and operational what will be the throughput og those two ports. Please clarify
Thanks & Regards,
Naveen
03-26-2013 02:41 AM
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The maximum throughput of a switch depends on its internal bandwidth and its packets per second forwarding capacity.
In Cisco specifications, maximum fabric bandwidth needed is twice all your port bandwidths (non-duplex bandwidth, e.g. 100 Mbps, gig, etc.).
Maximum packets per second needed (PPS) is based on packet size. Smaller packets increase the need for PPS. For Ethernet, if you don't know expected packet size, you generally assume worse case which is 1.488 Mpps per 1 Gbps. Maximum PPS needed would be all your port bandwidths (again non-duplex bandwidth) times 1.488 Mpps per Gbps.
03-26-2013 08:33 PM
Hi Joseph,
Thnaks for the reply,
colud you please expain
you generally assume worse case which is 1.488 Mpps per 1 Gbps
03-27-2013 02:01 AM
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The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
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Worse case is for minimum size packets, because this requires the highest packets per second for the same line rate.
If might help if you review:
ftp://ftp.cs.princeton.edu/reports/2002/645.pdf
http://www.cisco.com/en/US/products/hw/modules/ps2643/products_white_paper09186a0080091db8.shtml
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