[55670] in North American Network Operators' Group
Re: Cascading Failures Could Crash the Global Internet
daemon@ATHENA.MIT.EDU (N. Richard Solis)
Thu Feb 6 16:10:11 2003
Date: Thu, 6 Feb 2003 16:09:10 -0500
From: "N. Richard Solis" <nrsolis@aol.net>
To: "Sean Donelan" <sean@donelan.com>
Cc: nanog@merit.edu
In-Reply-To: <Pine.GSO.4.44.0302061530100.28581-100000@clifden.donelan.com>
Errors-To: owner-nanog-outgoing@merit.edu
I don't know of too many electrical distribution networks that use DC
interconnection to limit AC failures from propogating.<br>
<br>
The main cause of AC disruption is a power plant getting out of phase
with the rest of the power plants on the grid. When that happens, the
plant "trips" of goes off-line to protect the entire grid. You lose
some generating capacity but you dont fry everything on the network
either.<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.nerc.com/">http://www.nerc.com/</a><br>
<br>
There are some states that operate their own grids. Texas, for example.<br>
<br>
-Richard<br>
<br>
<br>
Sean Donelan wrote:
<p> </p>
<blockquote type="cite"
style="border-left: thin solid blue; padding-left: 10px; margin-left: 0pt;"> <tt> <br>
<br>
Sigh, there are differences between tightly coupled networks, such as <br>
the electric power grid and loosely couple networks like the Internet. <br>
But there are also some similarities, such as electric grids use DC <br>
interconnections to limit how far AC disturbances propagate; the <br>
Internet uses AS interconnections to limit IGP disturbances from <br>
propagating. <br>
<br>
<a href="http://sci.newsfactor.com/perl/story/20686.html">http://sci.newsfactor.com/perl/story/20686.html</a> <br>
<br>
The actual article requires payment to read <br>
<a
href="http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLEEE8000066000006065102000001&idtype=cvips&gifs=Yes">http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLEEE8000066000006065102000001&idtype=cvips&gifs=Yes</a> <br>
<br>
<br>
</tt> </blockquote>
