Cisco CVOICE 8.0: Congestion, Rate Limiting, and AutoQoS

The target audience for this course is established IT professionals with a solid, existing background in Cisco and networking technologies.

Please contact us for information about prerequisites.

Expected Duration
120 minutes

Queuing algorithms are one of the primary ways to manage congestion in a network. Network devices manage an overflow of arriving traffic by using a queuing algorithm to sort traffic and determine a method of prioritizing the traffic onto an output link. Traffic policing controls the maximum rate of traffic that is sent or received on an interface.
Traffic policing is used on interfaces at the network edge to limit traffic into or out of the network. Traffic shaping controls outgoing traffic on an interface to match the transmission rate to the speed of the remote end, and ensures that the traffic conforms to administrative quality of service (QoS) policies. Class-based weighted fair queuing (CBWFQ) extends the standard weighted fair queuing (WFQ) functionality, providing support for user-defined traffic classes. A queue is reserved for each class, and traffic belonging to a class is directed to the queue for that class. Low latency queuing (LLQ) brings strict priority queuing to CBWFQ. Strict priority queuing allows delay-sensitive data such as voice to be dequeued and sent first (before packets in other queues are dequeued), giving delay-sensitive data preferential treatment over other traffic. This course describes the queuing architecture: traffic-policing, traffic-shaping, CBWFQ, and LLQ.
Cisco AutoQoS represents two technologies, Cisco AutoQoS VoIP and Cisco AutoQoS for the Enterprise. These technologies simplify network administration challenges, reducing quality of service (QoS) complexity, deployment time, and cost in enterprise networks. Cisco AutoQoS VoIP incorporates value-added intelligence in Cisco IOS Software and Cisco Catalyst software to provision and manage large-scale QoS deployments. It provides QoS provisioning for individual routers and switches, simplifying deployment and reducing human error. Cisco AutoQoS VoIP offers straightforward capabilities to automate VoIP deployments for customers who want to deploy IP telephony but who lack the expertise and staffing to plan and deploy IP QoS and IP services. Cisco AutoQoS for the Enterprise is a process in which two intelligent mechanisms are deployed to detect voice, video, and data traffic in Cisco networks. The mechanisms generate best-practice QoS policies and apply those policies to WAN interfaces. This course explores the capabilities, requirements, and configuration of Cisco AutoQoS VoIP and Cisco AutoQoS for the Enterprise.


Managing Congestion and Rate Limiting

  • identify the features of aggregation and queuing
  • recognize the purposes of, and differences between, traffic shaping and traffic policing
  • recognize how to configure and monitor class-based policing
  • recognize how to configure and monitor class-based shaping
  • recognize how to configure and calculate bandwidth for LLQ
  • Understanding Cisco AutoQoS

  • identify the features of Cisco AutoQoS VoIP
  • recognize how to configure and monitor Cisco AutoQoS VoIP
  • recognize how Cisco AutoQoS for the Enterprise is configured and monitored
  • configure AutoQoS VoIP




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