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See matching posts in thread - Junos CoS Classification
See matching posts in thread - QoS/CoS Guide...Hi all, i'm someho...
Question What is the default mapping of code points to Junos CoS forwarding classes?
You map incoming traffic to a forwarding class, define the class-of-service (CoS) properties for the forwarding class through a scheduler, and assign the forwarding class to an output queue. For most CoS applications, you assign one forwarding class to one output queue. But for some CoS applications, you can map multiple forwarding classes to a single output queue
Consider the following example: 1G interface: Queue 1 - CoS A - 25% bandwidth priority high Queue 2 - CoS B - 35% bandwidth priority medium Queue 3 - CoS C - 40% bandwidth priority low In the preceding example, to confirm that the queueing mechanism is working properly, you need to generate traffic that is split into the three classes of service (CoS): CoS A, CoS B, and CoS C. One test could be to send 300 Mbps for CoS A and nothing for CoS B and CoS C, and then check whether Queue 1 has access to the leftover bandwidth
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Question How do I get started with CoS or QoS? Answer Please see the following resources: QOS-Enabled Networks – Tools and Foundations by Miguel Barreiros and Peter Lundqvist: http://www.juniper.net/us/en/training/jnbooks/qos-enabled.page Day One Guides Day One: Deploying Basic QoS: http://www.juniper.net/us/en/training/jnbooks/day-one/fundamentals-series/deploying-basic-qos/ Day One: Junos QoS for IOS Engineers: http://www.juniper.net/us/en/training/jnbooks/day-one/fundamentals-series/junos-qos/ Day One: Advanced Junos CoS Troubleshooting Cookbook: http://www.juniper.net/us/en/training/jnbooks/day-one/networking-technologies-series/junos-cos-troubleshooting/ Feature Guides CoS Feature Guide for Routing Devices Traffic Management Feature Guide(s) for QFX Devices Class of Service Feature Guide for EX Devices Class of Service Feature Guide for Security Devices NCEs Learning Byte series on Class of Service Basics: https://learningportal.juniper.net/juniper/user activity info.aspx?id=5853 #FAQ #qualityofservice #ClassofService #COS #QOS
Answer You use schedulers to define the class-of-service (CoS) properties of forwarding classes and output queues. You configure CoS properties in a scheduler, then map the scheduler to a forwarding class
Question What are the default Juniper CoS forwarding classes? Answer CoS packet classification assigns an incoming packet to a forwarding-class that’s ultimately associated with an output queue
Answer Hierarchical class of service (HCoS) is the ability to provide CoS functionality as a more granular level (for example, per subscriber rather than per port) by applying traffic schedulers and shapers to a hierarchy of scheduler nodes
Question What is the difference between CoS and QoS? Answer There are many possible definitions of Quality of Service (QoS), but for the purposes contrasting QoS to Junos Class of Service (CoS), QoS is the manipulation of aggregates of traffic such that each is forwarded in a fashion that is consistent with the required behaviors of the applications generating that traffic