[47117] in North American Network Operators' Group
RE: The Myth of Five 9's Reliability (fwd)
daemon@ATHENA.MIT.EDU (Deepak Jain)
Thu Apr 25 16:40:53 2002
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From: "Deepak Jain" <deepak@ai.net>
To: <deepak@ai.net>, "Mathew Lodge" <mathew@cplane.com>,
"Art Houle" <houle@zeppo.acns.fsu.edu>,
"Pete Kruckenberg" <pete@kruckenberg.com>
Cc: <nanog@merit.edu>
Date: Thu, 25 Apr 2002 16:39:55 -0400
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Doh. This should have read "Your service" not "Your server".
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
Deepak Jain
Sent: Thursday, April 25, 2002 4:26 PM
To: Mathew Lodge; Art Houle; Pete Kruckenberg
Cc: nanog@merit.edu
Subject: RE: The Myth of Five 9's Reliability (fwd)
[stuff missing]
When applied randomly to the Internet, I suppose that means if you can dial
into a RAS and establish a PPP/IPCP session, but the RAS' connection to the
Internet is down, then the service is up :-)
[stuff missing]
I seem to remember a large internet provider's service contract reading
something to the effect of. "Your server is considered down if customer
router cannot pass packets [or ping] with service provider's immediate
upstream router." This is a functional description of the above for
dedicated lines, as customer aggregation routers never talked to the
internet, so if there was a problem at a transit router you weren't getting
anywhere.
A modern contract I saw recently defined "up" for colocation purposes as
"the customer's assigned gigabit port is available." Though available was
not a defined term, one could not easily apply that to a ports' willingness
to pass packets. One could say a congested port was not available though, I
guess.
Deepak Jain
AiNET
