With VoIP, QoS has to deal with issues such as bandwidth, delay, jitter, and data loss when providing an acceptable level of service. Cisco can provide the following QoS advantages:
Use and control of resources efficiently in the network
Adapt QoS based on customers and their applications
Allow VoIP and mission-critical resources to exist side by side
To deal with QoS issues, you first need to classify your traffic based on issues such as bandwidth, delay, jitter, and loss requirements. Based on this information, you'll want to implement one or more QoS solutions for important traffic to ensure that it gets its necessary level of service. As you'll see throughout the rest of this chapter, Catalyst switches and routers ...