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Chapter 18 Quality of Service (QoS)
P-2612HW Series User’s Guide
351
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.
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.
18.5.4 Automatic Priority Queue Assignment
If you enable QoS on the ZyXEL Device, the ZyXEL Device can automatically base
on the IEEE 802.1p priority level, IP precedence and/or packet length to assign
priority to traffic which does not match a class.
The following table shows you the internal layer-2 and layer-3 QoS mapping on
the ZyXEL Device. On the ZyXEL Device, traffic assigned to higher priority queues
DSCP (6 bits)
Unused (2 bits)
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Страница 22: ...Table of Contents P 2612HW Series User s Guide 22...
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Страница 56: ...Chapter 3 Wizards P 2612HW Series User s Guide 56...
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Страница 120: ...Chapter 6 WAN Setup P 2612HW Series User s Guide 120...
Страница 136: ...Chapter 7 LAN Setup P 2612HW Series User s Guide 136...
Страница 168: ...Chapter 8 Wireless LAN P 2612HW Series User s Guide 168...
Страница 184: ...Chapter 9 Network Address Translation NAT P 2612HW Series User s Guide 184...
Страница 250: ...Chapter 12 Firewall P 2612HW Series User s Guide 250...
Страница 290: ...Chapter 14 VPN P 2612HW Series User s Guide 290...
Страница 320: ...Chapter 15 Certificates P 2612HW Series User s Guide 320...
Страница 324: ...Chapter 16 Static Route P 2612HW Series User s Guide 324...
Страница 356: ...Chapter 19 Dynamic DNS Setup P 2612HW Series User s Guide 356...
Страница 382: ...Chapter 21 Universal Plug and Play UPnP P 2612HW Series User s Guide 382...
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Страница 406: ...Chapter 23 Logs P 2612HW Series User s Guide 406...
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Страница 494: ...Appendix B Pop up Windows JavaScripts and Java Permissions P 2612HW Series User s Guide 494...
Страница 530: ...Appendix D Wireless LANs P 2612HW Series User s Guide 530...
Страница 547: ...Index P 2612HW Series User s Guide 547...