one word: WRED Andy ----- Original Message ----- From: "Ed Dombrowski" To: Sent: Tuesday, May 01, 2001 12:12 AM Subject: Re: WAN Congestion - Cloud technology - Theory vs Reality [7:2645] > Another concept you may want to investigate in regards to Frame Relay and > ATM is closed loop architecture and open loop architecture. It has been a > while since i have read about the differences but if i remember correctly > open loop allows the customer to keep sending traffic and then relies on the > customers higher layer applications to manage the congestion control. In > closed loop the carrier is aware of the congestion from end to end and will > throttle back customer traffic at the edge and use congestion notification > backwards and forwards along the path to control congestion. By throttling > back the customer trqaffic at the edge it keeps more traffic from getting > onto an already congested network and making the problem worse. Some > carriers use open some use closed. I am sure my definitions leave something > to be desired but i think that is the basic idea. It might pay to do a > search at the Frame Relay forumn if you want more info. > > Ed Dombrowski > > ""Chuck Larrieu"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > 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=2669&t=2669 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
