Quality of Service (QoS)
Learn about QoS and its importance in managing network traffic. Discover how to classify and mark traffic, handle congestion, and apply QoS on VPNs. Ideal for CCIE Enterprise and Service Provider preparation.
What you’ll learn
- What is QOS and how to do Classification & Marking
- The ability to apply QOS where it is appropriate
- Learn how Delay affects the network and how Dealy works
- Congestion in a network and how to manage it
- QOS on VPN: how to apply it
Quality of Service
End to end L3 QoS using MQC
Quality of Service (QoS) is a mechanism or technology that handles network traffic and allocates capacity to ensure the performance of critical applications. All QoS mechanisms are designed to resolve or reduce bandwidth overutilization, delay, flapping, and packet loss in a network.
DiffServ
CoS and DSCP Mapping
Classification & Marking
. QoS classification refers to the process of classifying the type of IP packets or traffic. Traffic types can be data, video, or voice traffic.
Convert marking to default
Network Based Application Recognition (NBAR)
NBAR is a deep packet inspection tool used to classify and recognize a wide range of protocols and applications utilizing data from Layer 3 to Layer 7, including applications that dynamically assign TCP and UDP port numbers.
Marking using IP Precedence, DSCP, CoS
Software Queue, PQ, CQ, WFQ, CBWFQ, and LLQ
Tail drop
Types of Delay
Processing delay – time it takes a router to process the packet header
Queuing delay – time the packet spends in routing queues
Transmission delay – time it takes to push the packet’s bits onto the link
Propagation delay – time for a signal to propagate through the media
Policing, shaping
Traffic shaping is a QoS tool that allows higher-priority traffic to flow at optimal levels even when the bandwidth is highly utilized (prioritize traffic).
Congestion management and avoidance
Congestion, in the context of networks, refers to a network state where a node or link carries so much data that it may deteriorate network service quality, resulting in queuing delay, frame or data packet loss and the blocking of new connections. In a congested network, response time slows with reduced network throughput.
QOS over VPN
Who this course is for:
- Folks who is Preparing for CCIE Enterprise, Service Provider etc, and who wants to deep dive into QOS.
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