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 intellerSociopaths always win.
join:2003-12-08
Tulsa, OK | whatever happened to redundancy? I thought the whole thought behind the Internet was to supposed to be redundant. | |
RadioDoc58ef2c0Premium,ExMod 2000-03
join:2000-05-11 | We'll wait for you to figure out how much of the Internet was actually "down" during this outage.
Extra credit: Level 3 is one transport provider. How many others are there? | |
| said by RadioDoc:We'll wait for you to figure out how much of the Internet was actually "down" during this outage. Extra credit: Level 3 is one transport provider. How many others are there? Considering Level 3 is a Tier 1 provider, and it affected a wide area, I would imagine it affected many people, including other carriers (other Tier 1s that are peering, down to [especially single-homed] Tier 3s). That doesn't necessarily mean the effect was noticeable (in a crippling way) to all end-users, or wasn't countered by the other carriers.
Of course, the ones that are redundant would have just rerouted traffic (transit or peering) to another location, but that would have increased load on other circuits, possibly causing slow downs. Also assuming that the datacenter(s) in question weren't their only links in a chain to the rest of the world.
I skimmed the article and sub-articles, but was unable to find the cause of the Level 3 outage, only the AT&T one (also supported by Slashdot). I do find it interesting that a carrier as large as AT&T had power problems, usually backup power is N+1 or better. Are they really as reliable as they claim? Or only when the weather suits them?
Extra Credit: That depends on your definition of "transport provider". Assuming you mean a Tier 1, as Level 3 is, there are 7 others (AT&T, Verizon, Sprint, Qwest, Savvis, NTT, and Global Crossing). If you consider Tier 2s, there are likely thousands worldwide.
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What happens when you combine common sense and an outspoken personality? | |
KearnstdElf WizardPremium
join:2002-01-22
Mullica Hill, NJ | reply to inteller
id be more worried to why there was not backup diesels started up with in a minute or two of the data center dropping off grid.
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[65 Arcanist]Filan(High Elf) Zone: Broadband Reports | |
NormanSPremium,MVM
join:2001-02-14
San Jose, CA
kudos:4 Reviews:
 ·SONIC.NET
·Pacific Bell - SBC
| reply to inteller
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:
12/30/08 02:44:42 Slow traceroute www.yahoo.com
Trace www.yahoo.com (209.131.36.158) ...
192.168.0.1 RTT: 0ms TTL:170 (suzuka.aosake.net ok)
69.105.39.254 RTT: 10ms TTL:170 (adsl-69-105-39-254.dsl.pltn13.pacbell.net ok)
76.246.22.2 RTT: 8ms TTL:170 (No rDNS)
151.164.93.237 RTT: 8ms TTL:170 (No rDNS)
151.164.190.14 RTT: 10ms TTL:170 (ex1-p9-1.eqsjca.sbcglobal.net ok)
151.164.248.58 RTT: 10ms TTL:170 (asn10310-yahoo-10g.eqsjca.sbcglobal.net ok)
216.115.107.83 RTT: 10ms TTL:170 (ae0-p171.msr2.sp1.yahoo.com ok)
209.131.32.19 RTT: 10ms TTL:170 (te-8-1.bas-a2.sp1.yahoo.com ok)
209.131.36.158 RTT: 10ms TTL: 56 (f1.www.vip.sp1.yahoo.com ok)
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.
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Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum | |
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