NormanS
Premium,MVM
join:2001-02-14
San Jose, CA
 ·Pacific Bell - SBC
| reply to inteller
Re: whatever happened to redundancy?
I did not lose connection to most of the sites people were not connecting with during that outage. But my ISP (at&t Yahoo! HSI) has their own peering agreements with Google, Microsoft, and Yahoo!, so all traffic to those sites leaves the local AT&T Internet Services (aka ATTIS) transit network directly for their respective transit networks; and never touches a Tier 1 network on the way:
There are currently eight recognized Tier 1 networks. If your ISP buys all transit to the Internet through just one of those Tier 1 networks, and that network goes down for any reason, you are hosed.
My ISP peers with at least two Tier 1 networks (AT&T Worldnet Services (ATTW; which is different from ATTIS), and Level 3), so I imagine that ATTW would pick up the load if Level 3 bombed.
There are also a number of other networks, at the Tier 2 level, which should, in a pinch, be able to route around a Tier 1 network gone south. More often than not, I never see a Tier 1 network in my routes; and about equally ATTW, or Level 3 when I do.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum |
