New Training: Describe DiffServ Techniques

In this 7-video skill, CBT Nuggets trainer Jeff Kish explores the many techniques available to improve DiffServ QoS deployments.

Gain an understanding of Congestion Avoidance, Shaping, Policing, and Link Efficiency techniques. Watch this new Cisco training.

Learn Cisco with one of these courses:

• Quality of Service (QoS) for Cisco Voice and Cisco Video Training

• Cisco CCNP Collaboration Core

This training includes:

• 7 videos

• 1.1 hours of training

You’ll learn these topics in this skill:

• Intro

• Congestion Avoidance

• Policing

• Multi-rate, Multi-color Policers

• Shaping

• Link Efficiency Mechanisms

• Review and Quiz

Prevent Network Congestion with WRED While Using the DiffServ QoS Model

QoS (Quality of Service) is an important mechanism for enterprise-grade information networks. There are multiple strategies for implementing QoS. One of those strategies is called DiffServ. The DiffServ strategy works by the network attempting to reserve capacity at each node in the travel path for packets as they traverse through the network. Despite QoS policies defining traffic requirements, though, the DiffServ model can still experience network congestion if it is not configured properly. One of the ways that network congestion can be avoided while using the DiffServ model is by using the WRED features in Cisco networking equipment.

The DiffServ WRED feature enables WRED to use either the 6-bit differentiated services code point (DSCP) or the IP Precedence setting in IP packets. It uses these to calculate the drop probability for those packets. The DSCP value is comprised of the first 6 bits of the IP type of service. Before enabling WRED in Cisco networking equipment, though, a policy map with the class and bandwidth shape for that class needs to be configured first.