Hypervisor provides suitable end-to-end qos with optimal resource sharing.
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IntroductionThis document addresses the most Frequently Asked Questions (FAQs) related to Quality of Service (QoS). GeneralQ. What is Quality of Service (QoS)?
Q. What are congestion, delay, and jitter?
Q. What is the MQC?
Q. What does the service-policy is supported only on VIP interfaces with DCEF enabled message mean?
Q. How many classes does a Quality of Service (QoS) policy support?
Q. How are routing updates and Point-to-Point Protocol (PPP) / High-Level Data Link Control (HDLC) keepalives processed when a service policy is applied?
Q. Is Quality of Service (QoS) supported on interfaces configured with Integrated Routing and Bridging (IRB)?
Classification and MarkingQ. What is Quality of Service (QoS) pre-classification?
Q. Which packet header fields can be remarked? What values are available?
Q. Can I prioritize traffic based on the URL?
Q. What platforms and Cisco IOS software versions support Network Based Application Recognition (NBAR)?
Queueing and Congestion ManagementQ. What is the purpose of queueing?
Q. How do Weighted Fair Queueing (WFQ) and Class Based Weighted Fair Queueing (CBWFQ) operate?
Q. If a class in Class Based Weighted Fair Queueing (CBWFQ) is not using its bandwidth, can other classes use the bandwidth?
Q. Is Class Based Weighted Fair Queueing (CBWFQ) supported on subinterfaces?
Q. What is the difference between the priority and bandwidth statements in a policy-map?
Q. How is the queue limit calculated on the FlexWAN and Versatile Interface Processors (VIP)?
Q. How do you verify the queue-limit value?
Q. Can I enable fair queueing inside a class?
Q. What commands can I use to monitor queueing?
Q. RSVP can be used in conjunction with Class Based Weighted Fair Queueing (CBWFQ). When both Resource Reservation Protocol (RSVP) and CBWFQ are configured for an interface, do RSVP and CBWFQ act independently, exhibiting the same behavior that they would if each were running alone? RSVP seems to behave as if CBWFQ is not configured regarding bandwidth availability, assessment, and allocation.
Congestion Avoidance Weighted Random Early Detection (WRED)Q. Can I enabled Weighted Random Early Detection (WRED) and Low Latency Queueing (LLQ), or Class Based Weighted Fair Queueing (CBWFQ) at the same time?
Q. How can I monitor Weighted Random Early Detection (WRED) and see it actually taking effect?
Policing and ShapingQ. What is the difference between policing and shaping?
Q. What is a token bucket and how does the algorithm work?
Q. With a traffic policer such as class-based policing, what do Committed Burst (BC) and Excess Burst (Be) mean and how should I select these values?
Q. How does Committed Access Rate (CAR) or class-based policing decide if a packet conforms or exceeds the Committed Information Rate (CIR)? The router is dropping packets and reporting an exceeded rate even though the conformed rate is less than the configured CIR.
Q. Are the burst and queue limit independent of each other?
Quality of Service (QoS) Frame RelayQ. What values should I select for Committed Information Rate (CIR), Committed Burst (BC), Excess Burst (Be), and Minimum CIR (MinCIR)?
Q. Does Priority Queueing on the Frame Relay main interface work in Cisco IOS 12.1?
Q. Does Frame Relay Traffic Shaping (FRTS) work with Distributed Cisco Express Forwarding (dCEF) and Distributed Class Based Weighted Fair Queueing (dCBWFQ)?
Quality of Service (QoS) Over Asynchronous Transfer Mode (ATM)Q. Where do I apply a service policy with Class Based Weighted Fair Queueing (CBWFQ) and Low Latency Queueing (LLQ) on an Asynchronous Transfer Mode (ATM) interface?
Q. What bytes are counted by IP to Asynchronous Transfer Mode (ATM) Class of Service (COs) queueing?
Q. How many Virtual Circuits (VCS) can support a service policy simultaneously?
Q. Which Asynchronous Transfer Mode (ATM) hardware supports IP to ATM Class of Service (COs) features including Class Based Weighted Fair Queueing (CBWFQ) and Low Latency Queueing (LLQ)?
Voice and Quality of Service (QoS)Q. How does Link Fragmentation and Interleaving (LFI) work?
Q. What tools can I use to monitor Voice over IP performance?
Q. %SW_MGR-3-CM_ERROR_FEATURE_CLASS: Connection Manager Feature Error: Class SSS: (QoS) - install error, ignore.
Related Information
What is hypervisor in Nfv?Based upon the ETSI NFV reference architecture, hardware resources like compute, storage, and networking are abstracted using a virtualization layer called a hypervisor. The hypervisor creates and runs VMs that share the underlying hardware. One or more VMs are used to implement a VNF.
What is meant by virtualization demonstrate network virtualization considering OSI layers?16.1.
Network virtualization is the ability to manage and prioritize traffic in portions of a network that might be shared among different external networks. This ability allows administrators to use performance, resources, availability, and security more efficiently.
What is virtualization of a communication channel?Network virtualization is a method of combining the available resources in a network by splitting up the available bandwidth into channels, each of which is independent from the others and can be assigned -- or reassigned -- to a particular server or device in real time.
What is the process of virtualization?Virtualization uses software to create an abstraction layer over computer hardware that allows the hardware elements of a single computer—processors, memory, storage and more—to be divided into multiple virtual computers, commonly called virtual machines (VMs).
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