Congestion Management

5 posts are filed under this tag.

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 Queuing

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!Fairness for the [...]

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 Custom Queuing

By Arden Packeer, CCIE #20716 ⋅ June 12, 2007 ⋅ Post a comment

In my previous post, I talked a little bit about congestion management focusing on priority queuing. Priority queuing is great in making sure that VIP traffic gets to looked first dibs on that output queue when congestion occurs. The problem with priority queuing was starvation. If there was frames always waiting in the high queue [...]

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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