i have always used the values from the QoS SRND and i haven't had any problems
take a look at the following analysis http://www.mail-archive.com/ccie_voice@onlinestudylist.com/msg06644.html 2011/7/21 CCIEVoiceKP <ccievoic...@gmail.com> > I'm good with how to calculate BW from the QoS SRND, however it seems to > get a little squishy when it comes to values for cRTP and rounding the > output. For example, say I have a requirement to allow 5 g729 calls and I'm > using MLP with header compression. We know that by default CRTp should be 2 > without checksum and 4 with checksum but in going through the Vol1 and Vol 2 > labs and VoDs I've seen both values used with no metion of whether or not > checksum was a requirement. So if we calcualte first with cRTP of 2 bytes > we get 13 + 2 + 20 = 35 * 8 * 50 = 14000 = *14kbps* .... with cRTP of 4 > we get 13 + 4 + 20 = 14800 = *14.8kbps.* Now if we multiply this out by > the number of calls we get 14kbps * 5 = *70kbps* and 14.8 * 5 = *74kbps > *respectively > .... or do we? Because I've seen the rounding take place earlier on so we > would in essence have 15kbps * 5 = *75kbps.* > > Keep in mind this is if your following the SRND. Vik and Amy recommend > using 9bytes as the L2 value for MLP as opposed to 13bytes... I realize this > is a more accurate number but do we have any official guidance as to how the > proctors are grading this? Are they using values strictly from the SRND? > How big is the window or margin of error for these calculations? > > I know this sounds like splitting hairs but I've taken the lab before and > walked away with 0 points in QoS not knowing why. Thanks in advance for any > insight? > > KP > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
