If only circuit selection was based on redundant routes. =) Many times the number of carriers is limited, and existing partnerships, enemies, pricing, availability, and contract terms are further constraints. The physical circuit path is near the bottom of the criteria sheet in making a short list -- route diversity has to the decision maker's top priority if the customer stands a chance of actually achieving it. BTW, none of my customers has ever asked about our fiber routes. We're small, but you'd think someone would ask.... Frank -----Original Message----- From: Wallace Keith [mailto:kwallace@pcconnection.com] Sent: Tuesday, April 14, 2009 6:06 PM To: nanog@nanog.org Subject: Diversity - was: Fiber cut in SF area -----Original Message----- From: Roy [mailto:r.engehausen@gmail.com] Sent: Tuesday, April 14, 2009 6:43 PM To: Gino Villarini Cc: nanog@nanog.org Subject: Re: Fiber cut in SF area Gino Villarini wrote:
Here in my area most of business outfits that require maximum availability of Internet or WAN conenctions have implemented dual connections from dual providers, most with a fiber/copper main and a fixed wireless backup. This trend goes from banks to Mcdonalds
Gino A. Villarini gav@aeronetpr.com Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145
A large company in the affected area had a T3 supplied by AT&T and a wireless link to another ISP that was fed by two metro-ethernet links by companies other than AT&T.
All three uplinks were lost. So much for having backups,
This just goes to emphasize that when creating a diversity or backup scenario, you need to get full disclosure from Provider B that they do not use Provider A's facilities, including shared sheath, duct, etc in any way. Also, there is the need to avoid the same telco buildings, regen huts, etc. and in some cases, entire cities. Any telecom/datacom manager who has done their homework should be able to map out their paths back to critical diverse infrastructure. -Keith