Re: Curiosity about AS3356 L3/CenturyLink network resiliency (in general)

[Robert DeVita <radevita () mejeticks com>]

If this is a know issue and has happened before and point to point circuits aren’t effected you always have the 
opportunity to diversify your own network and get private lines back to Miami, Jax, Atlanta or Dallas to create your 
own diversity don’t you?

Robert DeVita
Managing Director
Mejeticks
c. 469-441-8864
e. radevita () mejeticks com
_____________________________
From: David Hubbard <dhubbard () dino hostasaurus com>
Sent: Wednesday, May 16, 2018 12:03 PM
Subject: Curiosity about AS3356 L3/CenturyLink network resiliency (in general)
To: <nanog () nanog org>


I’m curious if anyone who’s used 3356 for transit has found shortcomings in how their peering and redundancy is 
configured, or what a normal expectation to have is. The Tampa Bay market has been completely down for 3356 IP services 
twice so far this year, each for what I’d consider an unacceptable period of time (many hours). I’m learning that the 
entire market is served by just two fiber routes, through cities hundreds of miles away in either direction. So, 
basically two fiber cuts, potentially 1000+ miles apart, takes the entire region down. The most recent occurrence was a 
week or so ago when a Miami-area cut and an Orange, Texas cut (1287 driving miles apart) took IP services down for 
hours. It did not take point to point circuits to out of market locations down, so that suggests they even have the 
ability to be more redundant and simply choose not to.

I feel like it’s not unreasonable to expect more redundancy, or a much smaller attack surface given a disgruntled 
lineman who knows the routes could take an entire region down with a planned cut four states apart. Maybe other regions 
are better designed? Or are my expectations unreasonable? I carry three peers in that market, so it hasn’t been 
outage-causing, but I use 3356 in other markets too, and have plans for more, but it makes me wonder if I just haven't 
had the pleasure of similar outages elsewhere yet and I should factor that expectation into the design. It creates a 
problem for me in one location where I can only get them and Cogent, since Cogent can't be relied on for IPv6 service, 
which I need.

Thanks