AT&T 1998 meltdown was caused by software flaws http://www.att.com/press/0498/980422.bsb.html MCI's 1999 meltdown was caused by a software upgrade problem http://www.google.com/search?q=cache:198.112.59.30/home/news.nsf/all/9909175 mcini+MCI+mea+culpa&hl=en ----- Original Message ----- From: "Daniel Cotts" To: Sent: Monday, April 30, 2001 2:11 PM Subject: RE: WAN Congestion - Cloud technology - Theory vs Reality [7:2624] > Not sure of the details but there certainly were several Frame Relay network > meltdowns. The AT&T Stratacom switch IOS upgrade (oops!@) and the Ascend > (for MCI?). There were extenuating reasons for the initial failures but the > cloud didn't converge. Anyone have a postmortem on these events? > > > -----Original Message----- > > From: Chuck Larrieu [mailto:[EMAIL PROTECTED]] > > Sent: Monday, April 30, 2001 3:56 PM > > To: [EMAIL PROTECTED] > > Subject: WAN Congestion - Cloud technology - Theory vs > > Reality [7:2618] > > > > > > dropped/refused entry because of congestion on the cloud. > > This in turn leads > > to the retransmission of dropped packets/cells, which in turn > > leads to more > > congestion, in a never ending spiral ( in theory, at least ) > > > > Reality: This gets into sizing of WAN links / CIR's / CBR's > > > > I am a bit curious. Anyone here have any real world > > experience with this > > kind of thing happening? I can see how this can happen in theory. In > > reality, carrier cloud congestion is not such that it would > > likely lead to > > this kind of result, is it? > > > > So if the above premise is something that can and does happen > > regularly, > > what does the carrier do - just massive dropping of packets / > > cells until > > the problem disappears, probably after hours that day? > > > > Any experience? > > > > Chuck > > > > One IOS to forward them all. > > One IOS to find them. > > One IOS to summarize them all > > And in the routing table bind them. > > > > -JRR Chambers- > > FAQ, list archives, and subscription info: > > http://www.groupstudy.com/list/cisco.html > > Report misconduct > > and Nondisclosure violations to [EMAIL PROTECTED] > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=2639&t=2639 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
