Showing results for 
Search instead for 
Did you mean: 

QOS - Calculating bandwidth

If i have a 50 Meg pipe for my wan and I have X amount of data that is tranmitted over the circuit a week, how do I calculate the amount of data that should be reserved for that traffic.  The traffic include voice.  I know we can use a LLQ.  I am currently sending  9.1 Gigabytes.  Is there a typical formula that can be used so that I can figure out how much bandwidth the allocate out of my 50 Meg circuit.

1 Reply 1

Joseph W. Doherty
Hall of Fame
Hall of Fame


The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.


Cisco's recommendation is to allocate about 1/3 your bandwidth for LLQ.  If your actual LLQ traffic uses less, the excess is available to other traffic.  If the LLQ traffic actually uses more, you'll need a bigger pipe.  (NB: In my experience, LLQ traffic can usually allocate up to 40% without issues.)