Archive for the ‘QoS’ Category

Cisco IOS Custom Queuing (CQ) calculator

Thursday, May 10th, 2007

This is an Excel spreadsheet that I created when I was studying the Cisco IOS implementation of Custom Queuing.  It requires you to enter the type of traffic, desired bandwidth allocation ratio and the average packet size.  It’ll do all of the other calculations for you.

Don’t worry, you can either look up the formulas in the cells themselves or reference the formulas typed in plain text at the bottom of the calculator if you don’t understand or remember how to get the results.

Click here to access the calculator

Class-Based Traffic Shaping (Cisco) specifics

Tuesday, May 8th, 2007

If you’ve looked at the wonderful world of the Modular QoS CLI (MQC), you’ve probably come across the fact that you can shape traffic from within a policy map (in typical MQC style — class-by-class!).  This method of traffic shaping is called Class-Based Traffic Shaping (CTS).  Before CTS was around, Generic Traffic Shaping (GTS) was typically the tool of choice which shapes traffic on a per-interface basis.  With CTS, you can shape traffic on a per-class basis, allowing for a great deal of flexibility. (more…)