ZyXEL Communications P-660H-D Series - Manual (Page 170)

P-660R/H-D Series User’s Guide
169 Chapter 16 Media Bandwidth Management Advanced Setup
Figure 81 Media Bandwidth Management: Class Setup
The following table describes the labels in this screen.
16.12.1 DiffServ
DiffServ is a class of service (CoS) model that marks packets so that they receive specific per-
hop treatment at DiffServ-compliant network devices along the route based on the application
types and traffic flow. Packets are marked with DiffServ Code Points (DSCPs) indicating the
level of service desired. This allows the intermediary DiffServ-compliant network devices 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.
16.12.1.1 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.
Table 56 Media Bandwidth Management: Class Setup
LABEL DESCRIPTION
Interface Select an interface from the drop-down list box for which you wish to set up classes.
Back Click Back to go to the main Media Bandwidth Management screen.
Add Child-Class Click Add Child-class to add a sub-class.
Edit Click Edit to configure the selected class. You cannot edit the root class.
Delete Click Delete to delete the class and all its child-classes. You cannot delete the root
class.
Statistics Click Statistics to display the status of the selected class.