ZyXEL GS2200-8 User Guide - Page 241

Chapter 31 Differentiated Services The DSCP value determines the PHB (Per-Hop Behavior), that each packet gets as it is forwarded across the DiffServ network. Based on the marking rule different kinds of traffic can be marked for different 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 DiffServcompliant network devices. The boundary node (A in Figure 154) 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 154 DiffServ Network A PGS B P - Platinum G - Gold S - Silver B - Bronze SGP P S B B S GP P 31.2 Activating DiffServ Activate DiffServ to apply marking rules or IEEE 802.1p priority mapping on the Switch. Click IP Application > DiffServ in the navigation panel to display the screen as shown. Figure 155 IP Application > DiffServ GS2200-8/24 User's Guide 241