[AusNOG] Multiport 95th Calculations

[Tony]

Yes, so it might then make more sense to average the two perhaps, rather than just straight adding them together eg. (450 + 100) /2 = 275 "average 95th" over both links (for the example figures given) ?
I would tend to think option A is the only real way to go about this. What you are trying to sell is 500mbps commit with burst to 2Gbps possible.
Think about how you would do this if the two ports instead of being at different locations were a LAG at the same location ?

regards,Tony.


      From: Brendan Baker <Brendan.Baker at vocus.com.au>
 To: Patrick Cole <z at amused.net> 
Cc: "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net> 
 Sent: Thursday, 30 July 2015, 16:50
 Subject: Re: [AusNOG] Multiport 95th Calculations
   
Option B seems like it could be a bit of a nasty surprise.  If i’m reading correctly, wouldn’t that mean that if you’re doing 95th of 450Mbps on Port A, and 95th of 100Mbps on Port B, that you’d be hit with 550Mbps as your overall even if these bandwidth peaks occurred at different times (ie. you get billed burst despite never hitting your committed rate with your peak uitlisastion)

Cant think of a way to abuse Option A… Its well understood how long you can burst on a circuit and not have to pay extra (~2160 minutes)…and the providers take (should)  this into account in setting their prices. 



> On 30 Jul 2015, at 4:34 pm, Patrick Cole <z at amused.net> wrote:
> 
> Option A would be the only option IMHO.  All the other options 
> seriously favour the customer compared to a single link.
> 
> Opt A accurately accounts for the amount of instantaneous peak 
> utilisation that occurs on the the service providers' network 
> as a result of the two ports.  
> 
> As we all know BW purchase is based on peak utilisation so why
> should the customer expect any different?
> 
> Patrick
> 
> Thu, Jul 30, 2015 at 06:02:15AM +0000, Ben Cornish wrote:
> 
> 
>>  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
>> 
>>  Description: Description: cid:image001.png at 01CCB4C2.B40A97F0
>> 
>>  Over the Wire Pty Ltd - An Impirical Company
>>  Level 3, 24 Little Edward St, Spring Hill QLD 4000
>>  t    +61 7 3847 9292
>> 
>>  m    +61 417 617 204
>>  e  ben.cornish at overthewire.com.au    www.overthewire.com.au
>> 
>> 
>> 
>> 
>> 
>> 
> 
> 
> 
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> 
> 
> -- 
> Patrick Cole <z at wwwires.com>
> Senior Network Specialist
> World Without Wires
> PO Box 869. Palm Beach, QLD, 4221
> Ph:  0410 626 630


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