ZyXEL Communications GS1510-16 -, Руководство пользователя

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Chapter 15 QoS
GS1510 Series User’s Guide
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Switch to prioritize all incoming traffic. Click Advanced Settings > QoS > IP
DiffServ (DSCP) to open the screen.
15.5.1 Differentiated Services Code Point (DSCP)
Differentiated Services (DiffServ) is a class of service (CoS) model that marks
packets so that they receive specific per-hop treatment at DiffServ-compliant
network devices along the route based on the application types and traffic flow.
Packets are marked with DiffServ Code Points (DSCPs) indicating the level of
service desired. This allows the intermediary DiffServ-compliant network devices
to handle the packets differently depending on the code points without the need to
negotiate paths or remember state information for every flow. In addition,
applications do not have to request a particular service or give advanced notice of
where the traffic is going.
DiffServ defines a new DS (Differentiated Services) field to replace the Type of
Service (ToS) field in the IP header. The DS field contains a 2-bit unused field and
a 6-bit DSCP field which can define up to 64 service levels.
Figure 48 IP DiffServ (DSCP)