More likely everyone bought IRUs out of the same ILEC’s single cable.

Or they just all go through the same single raceway to enter the building, etc.

-Ben.

- Ben Cannon, AS15206

On Dec 19, 2018, at 9:41 AM, Rod Beck <rod.beck@unitedcablecompany.com> wrote:

Some of it is due to lazy buyers purchasing two IP ports from distinct companies without considring that two ports both located at the site are vulnerable to shared risers or entrance facilities. 

- R. 


From: NANOG <nanog-bounces@nanog.org> on behalf of Mike Hammett <nanog@ics-il.net>
Sent: Wednesday, December 19, 2018 3:12 PM
To: Mehmet Akcin
Cc: nanog@nanog.org
Subject: Re: How to choose a transport(terrestrial/subsea)
 
If people start spot-checking this stuff more regularly, perhaps the companies being verified will take delivering the correct product the first time more seriously.

Some of it boils down to a lack of data quality about what they actually have.

From: "Mehmet Akcin" <mehmet@akcin.net>
To: "James Breeden" <James@arenalgroup.co>
Cc: nanog@nanog.org
Sent: Tuesday, December 18, 2018 12:17:42 PM
Subject: Re: How to choose a transport(terrestrial/subsea)

That's a great example. Thank you James for sharing. I have done so many "GROUND TRUTH" visits where randomly selected certain physical points to validate physical diversity. Have seen several places where dual risers in the building were present or multiple building entries were available but not used. Ground truth events are certainly important and can be eye opening. It does not necessarily scale as you can't really walk all the fiber A-Z everywhere.. i know.

On Tue, Dec 18, 2018 at 6:49 AM James Breeden <James@arenalgroup.co> wrote:
I can't stress enough the importance of controlling your own route and even cable diversity. Require KMZs of the routes for any services you take (especially single path Wave type services). Put them in the contracts if you can.

I've had at least 1 situation where we had vendor diversity and what was supposed to be route diversity- 3 separate waves coming south and southeast out of a datacenter to 3 separate cities. Imagine my surprise when we took a outage one day that severed all 3 circuits. Yes all 3 circuits, going to 3 separate cities, on 3 separate carrier/s DWDM platforms, all happened to show up in the same sheath of cable at one location that happened to experience backhoe fade. Was not a good day.... 


James W. Breeden
Managing Partner
 
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Arenal Group: Arenal Consulting Group | Acilis Telecom | Pines Media
PO Box 1063 | Smithville, TX 78957
Email: james@arenalgroup.co | office 512.360.0000 | cell 512.304.0745 | www.arenalgroup.co
From: NANOG <nanog-bounces@nanog.org> on behalf of Brandon Martin <lists.nanog@monmotha.net>
Sent: Monday, December 17, 2018 4:59:44 PM
To: nanog@nanog.org
Subject: Re: How to choose a transport(terrestrial/subsea)
 
On 12/17/18 3:51 PM, Mehmet Akcin wrote:
> 
> One question, how much people care about vendor diversity? I do and did 
> care. I don’t want to put all my eggs in one basket. Do you care? Thank you

There are advantages and disadvantages to vendor diversity.

As advantages, you won't be subject to complete loss of connection 
because of a single dispute or provisioning/control plane issue with 
that one vendor.  You can also more easily pit vendors against each 
other for pricing if you are already vendor-diverse.

As a disadvantage, not only does vendor diversity obviously not imply 
route diversity, but it will completely put the onus on you to ensure 
route diversity if you want it.  With a single vendor, you can demand 
that your circuits have route diversity and, assuming you trust them, 
they have all the information they need to make that happen for you.
-- 
Brandon Martin