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Chapter 31 Differentiated Services

GS2200-8/24 User’s Guide

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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 DiffServ-

compliant 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

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

P - Platinum

G - Gold

S - Silver

B - Bronze