In the data world, 1/8 of a sec (125ms) is the default/de facto standard. IN voice applications you'll tend to find 1/100 sec (10ms).
So to adjust your math a little bit.... AR / Tc = max bits per Tc. That max number is up to you in splittng up. Bc + Be cannot exceed this value. So Bc + Be <= AR/Tc. HTH, Scott -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Hidalgo Sent: Sunday, June 01, 2008 8:20 PM To: [email protected] Subject: [OSL | CCIE_RS] Frame-Relay Traffic Shaping Hello All. I have two general questions about FR Traffic Shaping. I have seen questions when it is requested to set a specific CIR for a given PVC (value is provided), and also they ask for something like this: "Routers should be allowed to burst up to their Access Rate" Now as far as I understand, the formula to calculate the Excess Burst (BE) is the following: Access Rate (Port Speed) - CIR (provided) * TC/1000. Is this formula to calculate the BE correct? Also, if they are not specifying a TC value, is it safe to use the default which is 100 ?? Another question that I have is that sometimes I have seen that the default BC value is 1/8th of the CIR. But other times I have seen that it is calculated with this formula: CIR * TC/1000 In the Lab Exam, what could we use to feel safe if the TC is not being provided? Thanks for the time.
