ZyXEL P-663HN-51 Manuel d'utilisateur télécharger pdf (Page 105)

Chapter 10 Quality of Service (QoS)

P-663HN-51 User’s Guide

105

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.

10.1.3.1 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.

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 kinds of forwarding. Resources

can then be allocated according to the DSCP values and the configured policies.

10.2 Configuring QoS General Screen

Click Advanced > Quality of Service to open the screen as shown next.

DSCP (6 bits) Unused (2 bits)

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 299 300

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ZyXEL P-663HN-51 Manuel d'utilisateur Page 105