Requirement Survey Design
Before deploying QoS, you must be familiar with various services, traffic models, and QoS requirements of each service. In this way, QoS policies can be correctly designed and QoS guarantee can be provided for each service. Table 3-23 describes the key points of QoS requirement survey.
Requirement Type |
Key Point of Requirement Survey |
Survey Purpose |
|---|---|---|
Network status |
Traffic models of various services and E2E forwarding paths of each service, including forwarding paths in normal and abnormal conditions |
Determine the network location where a QoS policy is to be deployed. |
Bandwidth bottleneck points on the network and interface bandwidth of each bandwidth bottleneck point |
Determine whether to adopt the QoS policy or expand the network capacity. |
|
QoS |
Control services, multimedia services, and other important services that need to be focused on |
Understand traffic types and QoS requirements of each traffic type. |
Characteristics of traffic that can be identified by network devices. For example, check whether voice traffic uses a proprietary protocol such as the Session Initiation Protocol (SIP) or H.323, whether traffic is destined for or from a specific interface of a specific server, and whether traffic is from or destined for a specific host network segment. |
||
Bandwidth requirements of important services. For example, multimedia services from different vendors at different bit rates require different bandwidths so that the audio or video services can be smoothly transmitted. |
||
Processing policies for different multimedia applications. For example, for online videos, some enterprises consider that online videos on intranets need to be guaranteed and work-irrelevant online videos on the Internet do not need to be guaranteed. |