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Figure 37. Priority settings
DiffServ Priority
DiffServ or Differentiated Services is a computer networking architecture that specifies scalable and
coarse-grained mechanism for classifying, managing network traffic and providing quality of service
(QoS) guarantees on modern IP networks. DiffServ can, for example, be used to provide low-latency,
guaranteed service (GS) to critical network traffic such as voice or video while providing simple best-
effort traffic guarantees to non-critical services such as web traffic or file transfers.
The managed switch can classify traffic based on the DSCP field in the IP Header. DSCP in both IPv4 and
IPv6 will be supported. If DSCP priority is enabled, the switch classifies traffic based on the DSCP value.
DiffServ is a Layer 3 marking scheme that uses the DiffServ Code Point (DSCP) field in the IP header to
store the packet priority information. DSCP is an advanced intelligent method of traffic marking, as you
can choose how your network prioritizes different types of traffic. DSCP uses 64 values that map to user-
defined service levels, allowing you to establish more control over network traffic.
Choose
Enable to start priority features based on DiffServ. Then select the DSCP Priority Settings button
.
Figure 38. Diffserv settings
DSCP Priority Settings (Differentiated Services Code Point)
DiffServ allows the administrator to configure how selected applications and types of traffic are handled
by assigning various grades of network service to them. DSCP uses the IP header of a packet, and priority
is then preserved across the Internet. DSCP is backward compatible with IPV4 TOS, which allows for
operation with existing devices that use a layer 3 TOS enabled prioritization scheme.