Netgear XCM8806 Chassis User Manual - Page 359

NETGEAR 8800 User Manual queues and QoS profiles is forwarded to the egress port rate-shaping feature, which applies QoS to the entire port. When multiple QoS profiles are contending for egress bandwidth, the scheduler determines which queues are serviced. The following sections provide more information on QoS: • Applications and Types of QoS on page 359 • Traffic Groups on page 361 • Introduction to Rate Limiting, Rate Shaping, and Scheduling on page 366 • Meters on page 369 • QoS Profiles on page 369 • Multicast Traffic Queues on page 371 • Egress Port Rate Limiting and Rate Shaping on page 371 Applications and Types of QoS Different applications have different QoS requirements. Table 41 summarizes the QoS guidelines for different types of network traffic. Table 41. Traffic Type and QoS Guidelines Traffic type Key QoS parameters Voice Minimum bandwidth, priority Video Minimum bandwidth, priority, buffering (varies) Database Minimum bandwidth Web browsing Minimum bandwidth for critical applications, maximum bandwidth for noncritical applications File server Minimum bandwidth Consider the guidelines in Table 41 as general guidelines and not as strict recommendations. After QoS parameters have been set, you can monitor the performance of the application to determine if the actual behavior of the applications matches your expectations. It is very important to understand the needs and behavior of the particular applications you want to protect or limit. Behavioral aspects to consider include bandwidth needs, sensitivity to latency and jitter, and sensitivity and impact of packet loss. Note: Full-duplex links should be used when deploying policy-based QoS. Half-duplex operation on links can make delivery of guaranteed minimum bandwidth impossible. The following sections provide more information on the traffic types listed in Table 41: Chapter 15. QoS | 359