ZyXEL Communications XS3800-28, User Manual, Page: 358 / 789

Chapter 49 Differentiated Services
XS3800-28 User’s Guide
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priorities of forwarding. Resources can then be allocated according to the DSCP values and the
configured policies.
DiffServ Network Example
The following figure depicts a DiffServ network consisting of a group of directly connected DiffServ-
compliant network devices. The boundary node (
A in Figure 266 ) in a DiffServ network classifies (marks
with a DSCP value) the incoming packets into different traffic flows ( Platinum , Gold , Silver , Bronze )
based on the configured marking rules. A network administrator can then apply various traffic policies to
the traffic flows. An example traffic policy, is to give higher drop precedence to one traffic flow over
others. In our example, packets in the
Bronze traffic flow are more likely to be dropped when congestion
occurs than the packets in the Platinum traffic flow as they move across the DiffServ network.
Figure 266 DiffServ Network
49.2 Activating DiffServ
Activate DiffServ to apply marking rules or IEEE 802.1p priority mapping on the selected ports.
Click SWITCHING > QoS > Diffserv to display the screen as shown.