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Junos CoS Classification

I am reviewing the JNCIE-ENT self study bundle and am confused by some CoS configuration. The examples given guide the user through creating both dscp and ieee802.1p classifiers. Then they are instructed to apply the dscp classifiers to all L3 interfaces and apply the ieee802.1p classifiers to...



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Can I implement class of service (CoS) with MPLS?

Question Can I implement class of service (CoS) with MPLS? Answer Yes. You can use class of service (CoS) within MPLS networks to prioritize certain types of traffic during periods of congestion. Juniper Networks EX Series Ethernet Switches support Differentiated Service Code Point (DSCP)...


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FAQ: Class of Service (CoS) for Juniper Routing Devices

When a network experiences congestion and delay, some packets must be dropped. The Juniper Networks Junos operating system (Junos OS) class of service (CoS) enables you to divide traffic into classes and offer various levels of throughput and packet loss when congestion occurs. Class of...


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How do I apply CoS to my existing network?

Question How do I apply CoS to my existing network? Answer Please see the following Day One Guide: http://www.juniper.net/us/en/training/jnbooks/day-one/fundamentals-series/deploying-basic-qos/ #COS #FAQ #ClassofService


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What is the default scheduler policy for Junos CoS on routing devices?

Question What is the default scheduler policy for Junos CoS on routing devices? Answer If you do nothing to configure or assign classifiers on Juniper routing devices, Junos OS automatically assigns an implicit default IP precedence classifier to all logical interfaces that maps IPv4...


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Where can I learn about hierarchical class of service?

Question Where can I learn about hierarchical class of service? 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 ...


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What is the default mapping of code points to Junos CoS forwarding classes?

Question What is the default mapping of code points to Junos CoS forwarding classes? Answer The simplest way to classify a packet is to use behavior aggregate (BA) classification. The DSCP, DSCP IPv6, or IP precedence bits of the IP header convey the behavior aggregate class information....


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How do schedulers provide different treatment to the different forwarding classes?

Question How do schedulers provide different treatment to the different forwarding classes? 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...


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How does Juniper use shapers to help manage congestion?

Question How does Juniper use shapers to help manage congestion? Answer Shaping is the application of a limit to the rate at which traffic can be transmitted. Unlike policing, it acts on traffic that has already been granted access to a queue but which is awaiting access to transmission...