![ZyXEL Communications MGS3520 Series Скачать руководство пользователя страница 185](http://html.mh-extra.com/html/zyxel-communications/mgs3520-series/mgs3520-series_user-manual_945747185.webp)
MGS3520 Series User’s Guide
185
C
H A P T E R
2 2
Policy Rule
This chapter shows you how to configure policy rules.
22.1 Policy Rules Overview
A classifier distinguishes traffic into flows based on the configured criteria (refer to
for more information). A policy rule ensures that a traffic flow gets the requested
treatment in the network.
22.1.1 DiffServ
DiffServ (Differentiated Services) 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.
22.1.2 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.
22.2 Configuring Policy Rules
You must first configure a classifier in the
Classifier
screen. Refer to
for
more information.
DSCP (6 bits)
Unused (2 bits)
Содержание MGS3520 Series
Страница 18: ...18 PART I User s Guide ...
Страница 71: ...71 PART II Technical Reference ...
Страница 118: ...Chapter 9 VLAN MGS3520 Series User s Guide 118 Figure 58 Advanced Application VLAN Port Based VLAN Setup Port Isolation ...
Страница 189: ...Chapter 22 Policy Rule MGS3520 Series User s Guide 189 Figure 107 Policy Example EXAMPLE ...
Страница 408: ...Appendix B Common Services MGS3520 Series User s Guide 408 ...
Страница 420: ...Appendix D Legal Information MGS3520 Series User s Guide 420 Environmental Product Declaration ...