I believe the true calculation for the interval (Tc) is Bc=CIR(Tc/1000). This web page over-simplifies it. I have read in varoius sources (Intergrating Voice and Data Network, and from Wendel Odom himself, that it's actually the above calculation. I have other problem wih CCO web pages also, especially Dialer Watch, CBAC, etc. I think Cisco is too big to manage :)
""John Neiberger"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I only see two examples on that page that are different. The first is > on a 56k link, Bc=1000 and CIR=56000. Bc/CIR = .0178, or basically > 18ms. I know that's higher than the recommended 10ms, but perhaps there > are drawbacks to lowering the Bc below 1000 that I'm not aware of. > > The other example is on a 256k link. Bc = 1000, CIR = 256000, so > Bc/CIR = .004, or 4ms. This will set your Tc to the minimum of 10ms, > IIRC. > > Regards, > John > > >>> "Steven A. Ridder" 12/18/01 5:22:56 PM >>> > The bc info for the Frame-Relay traffic shaping info on that page is > wrong. > One should always target Bc to get a Tc of 10ms, but the config > examples are > more like a Bc of 36.4. So you have the serialization delay time at > 36.4, > but optimally you want 10ms. The packets will be going out at 10ms (or > less > cause fragmentation ias correct) but the time interval the router uses > is at > 36.4ms. > ""John Neiberger"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Here is another link that deals with WAN QoS, including some items > that > > might not occur to you such as sizing the interface transmit ring. > > > > > http://www.cisco.com/univercd/cc/td/doc/product/voice/ip_tele/avvidqos/qoswa > > n.htm > > > > > > HTH, > > John Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=29594&t=29559 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
