ZyXEL MAX-306 User Guide - Page 163
DSCP and Per-Hop Behavior, DiffServ: Differentiated Service Field
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Chapter 12 The Service Configuration Screens 12.4.8 DSCP and Per-Hop Behavior 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. The following figure illustrates the DS field. Figure 76 DiffServ: Differentiated Service Field DSCP (6-bit) Unused (2-bit) DSCP is backward compatible with the three precedence bits in the ToS octet so that non-DiffServ compliant, ToS-enabled network device will not conflict with the DSCP mapping. The DSCP value determines the forwarding behavior, the PHB (Per-Hop Behavior), that each packet gets 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. User's Guide 163