Queueing

6 posts are filed under this tag.

QOS: Applying CBWFQ to a sub-interface

By Arden Packeer, CCIE #20716 ⋅ April 9, 2008 ⋅ 2 comments

By default IOS does not let you apply CBWFQ directly to a sub interface. I ran into this scenario and worked my way around it in a workbook lab (IE Workbook Vol 2 - Lab 15). I thought it was pretty cool and hopefully it helps someone else out..

Tutorial: What is the difference between bandwidth percent and bandwidth remaining percent?

By Arden Packeer, CCIE #20716 ⋅ March 15, 2008 ⋅ 9 comments

One of the most common questions that CCIE candidates face when studying QOS MQC for the lab is “What is the difference between bandwidth percent and bandwidth remaining percent?”. Both are used in CBWFQ when implementing congestion management but what is the difference? The answer to this questions are the focus of this tutorial.

Implementing Weighted Fair Queing, Part II

By Arden Packeer, CCIE #20716 ⋅ June 14, 2007 ⋅ Post a comment

Thanks for visiting! If you’re new here, you may want to subscribe to my RSS feed. This blog posts regular tutorials, news, and study tips about networking, especially about Cisco CCIE related topics. Go ahead, subscribe to the rss feed! You can also receive updates from this blog via email. Thanks for visiting!But Wait…theres still [...]

Implementing Weighted Fair Queuing

By Arden Packeer, CCIE #20716 ⋅ June 14, 2007 ⋅ Post a comment

Fairness for the Little Guy.
Weighted Fair Queue (WFQ) is another congestion management strategy. It is very different from the other two congestion management strategies we have looked at (PQ and CQ), in that it does not need classification options configured. Traffic is automatically sorted and put into different queues without any kind of access-list [...]

CAR & CIR - What the hell is the difference?

By Arden Packeer, CCIE #20716 ⋅ June 13, 2007 ⋅ Post a comment

What is the difference?
When we are talking about Committed Information Rate we are usually talking about Traffic Shaping. This is especially true of Frame Relay Traffic Shaping (FRTS). In FRTS we might configure a CIR with the frame-relay cir command:
For example:
interface serial0
encapsulation frame-relay
frame-relay traffic-shaping
frame-relay interface-dlci 200
class adjust_vc_class_rate
!
map-class frame-relay adjust_vc_class_rate
frame-relay cir [...]

Configuring Priority Queuing

By Arden Packeer, CCIE #20716 ⋅ June 11, 2007 ⋅ One comment

What is Congestion Management?
Priority Queuing is a QoS congestion management mechanism. What the hell is a congestion management mechanism I hear you ask? Congestion management is how a router deals with what happens when its output queue is full. A router can’t really do much to control traffic, all it does is collect frames, figure [...]

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