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50D-Link DCS-3010 User Manual
Conguration
QoS/DSCP
DSCP-ECN denes QoS at Layer 3 (Network Layer). The Differentiated Services (DiffServ) model is based on packet marking and
router queuing disciplines. The marking is done by adding a eld to the IP header, called the DSCP (Differentiated Services Code
Point). This is a 6-bit eld that provides 64 different class IDs. It gives an indication of how a given packet is to be forwarded, known
as the Per Hop Behavior (PHB). The PHB describes a particular service level in terms of bandwidth, queuing theory, and dropping
(discarding the packet) decisions. Routers at each network node classify packets according to their DSCP value and give them a
particular forwarding treatment. For example, how much bandwidth should be reserved.
Quality of Service refers to a resource reservation control mechanism, which guarantees a certain quality to different services on the
network. Quality of service guarantees are important if the network capacity is insufcient, especially for real-time streaming multimedia
applications. Quality can be dened as, for instance, a maintained level of bit rate, low latency, no packet dropping, etc.