Using QoS to classify and prioritize network traffic

QoS is used to classify and prioritize traffic throughout a network. QoS enables you to establish an end-to-end traffic-priority policy to improve the control and throughput of important data. You can manage available bandwidth so that the most important traffic goes first. For example, you can use QoS to:
  • Upgrade or downgrade traffic from various servers.

  • Control the priority of traffic from dedicated VLANs or applications.

  • Change the priorities of traffic from various segments of your network as your business needs change.

  • Set priority policies in edge switches in your network to enable traffic-handling rules across the network.
    Figure 24: 802.1p priority based on CoS (Class-of-Service) types and use of VLAN tags
    Figure 25: Application of Differentiated Services Codepoint (DSCP) policies