[AusNOG] Multiport 95th Calculations

[Mark Sergeant]

Option A seems the most likely method. Can't think of any obvious way to abuse option A, unless the clocks on the devices were out...

Cheers,

Mark

From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Ben Cornish
Sent: Thursday, 30 July 2015 4:02 PM
To: 'ausnog at lists.ausnog.net'
Subject: [AusNOG] Multiport 95th Calculations

Hey All,

I'm curious on feedback from the industry on how everyone would expect a carrier to calculate 95th usage over a multiple link transit product.

Client takes 2 or more Transit Ports with a provider for redundancy reasons or for whatever reason they want - ie split backbone.
Ie ports at 2 or more different locations for whatever reason.
They would like to buy 95th percentile transit - bundled over multiple ports.

For this scenario - Let's say they want to commit to 500Mb/sec of transit split over 2x 1Gig ports and pay an excess for anything over 500Mb/sec

Would you assume the provider :

A:
Aggregates the 2x Links usage figures for the month and then perform 95th on the totals
Ie Link A + Link B Then do 95th calculation. (Do this on Upload and download separately)
Pick the highest of the upload or the download as the top figure. Bill excess if over 500

Or

B:
Calculate 95th on each link and add the 95th of each link together to get the total 95th.
Ie 95th of Link A + 95th of Link B = Total (Do this on Upload and download separately)
Pick the highest of the upload or the download as the top figure. Bill excess if over 500

One last question - can anyone think of any way to actually abuse option A...


Ben Cornish
General Manager
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Over the Wire Pty Ltd - An Impirical Company
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