Effective Bandwidth Calculation

[leonardolopez726]

Hi everyone,

I am trying to select the appropiate equipment needed for two small branches with IPv6, one of them is having a 2 Mbps WAN Bandwidth and the other one is with 25 Mbps.

According to the router performance table (http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf) a Cisco Router 891 (which supports up to 51.20 Mbps) would be enough for both of them.

Am i right or am i just misunderstanding the related document?

Any further suggestion will be highly appreciated.

Thank you.

[Leo Laohoo · Accepted solution]

Am i right or am i just misunderstanding the related document?

My response is not an insult to you or anyone in the same boat.  

The value of 51.20 is the TOTAL amount of bandwidth the appliance can do.  (The documentation was written by Marketing/Sales people who's sole objective in life is to sell.  So this means some numbers maybe correct but some facts are obscured, hidden, twisted, etc.)  So 51.20 Mbps is the SUM of the upload and download speed of the appliance.  The value of 51.20 Mbps also do not include encryption.  

This means that you take the HALF value of 51.20 Mbps and you'll get the realistic idea of 25.60 Mbps throughput (upload OR download) and without encryption.  If you want to run encryption then you take the value of 25.60 Mbps and, as a rule-of-thumb around here, half this value even further and you'll get 12.80 Mbps.

I hope this makes sense.

[leonardolopez726]

Hi Leo, thanks for your answer.

is this throughput calculated for each interface or for the full equipment?

[Leo Laohoo]

is this throughput calculated for each interface or for the full equipment?

And that's another question you won't find in the Data Sheet.  The answer is the whole appliance.

[Leo Laohoo]

Thank you for taking the time to rate our posts, Leonardo.  :)

[Joseph W. Doherty]

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You might find the attached document helpful.

Unfortunately, the attachment doesn't address IPv6 performance, but I would suspect it may be more demanding than IPv4.