TAILIEUCHUNG - The Differentiated Services Model

The Challenge: Organizations delivering network-based services need powerful end-to-end solutions to effectively and predictably deliver the differing Quality-of-Service (QoS) requirements of voice, video, and data applications. Voice, for example, requires a small but assured amount of bandwidth, low delay, low jitter and low packet loss. A data application such as file transfer protocol (ftp) needs more bandwidth, but can tolerate the delay & jitter. | Cisco Systems Data Sheet Cisco IOS Software Quality-of-Service The Differentiated Services Model DiffServ The Challenge Organizations delivering network-based services need powerful end-to-end solutions to effectively and predictably deliver the differing Quality-of-Service QoS requirements of voice video and data applications. Voice for example requires a small but assured amount of bandwidth low delay low jitter and low packet loss. A data application such as file transfer protocol ftp needs more bandwidth but can tolerate the delay jitter. The Solution Cisco IOS software s DiffServ offers application-level QoS and traffic management in an architecture that incorporates mechanisms to control bandwidth delay jitter and packet loss. Cisco s Diffserv complements Cisco s IntServ offering by providing a more scalable architecture for end-to-end QoS. This scalability is achieved by the mechanisms controlling QoS at an aggregate level. Application traffic can be categorized into multiple classes aggregates with QoS parameters defined for each class. A typical arrangement would be to categorize traffic into premium gold silver bronze and best-effort classes. Standards-based Cisco IOS software s DiffServ is fully compliant with the Internet Engineering Task Force IETF standards defined in RFC 2474 RFC 2475 RFC 2597 and RFC 2598. Cisco s solution leverages the new IETF definition of the IPv4 Type of Service ToS octet in the IP packet-header by utilizing the Differentiated Services Code Point DSCP field to classify packets into any of the 64 possible classes. Once the packets are classified IETF-defined per-hop behaviors PHBs including assured forwarding AF and expedited forwarding EF are implemented using Cisco s QoS tool chest. Traffic that is characterized as EF will receive the lowest latency jitter and assured bandwidth services which is suitable for applications such as VoIP. AF allows carving out the bandwidth between multiple classes in a network according to .

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