Tos; Introduction To Diffserv; Figure 36 Tos/Diffserv; Table 22 Tos/Diffserv - ZyXEL Communications ZyXEL Prestige 2000W User Manual

Prestige 2000W_V2 User's Guide

13.8 ToS

The second byte in an IPv4 packet is the Type of Service (ToS) byte. The first three bits (by
themselves) of the ToS byte are referred to as the IP Precedence bits and refer to a priority
from 0 to 7. The next three bits are used in conjunction with the IP Precedence bits to define
the Diffserv Code Point protocol (DSCP bits). The last two bits are reserved for future use.

13.9 Introduction to DiffServ

Quality of Service (QOS) mechanisms provides the best service on a per-flow guarantee. To
fine-tune the levels of services on the priority of the traffic flow using QoS places a heavy
burden on the network infrastructure.
DiffServ is a class of service (CoS) model that marks packets so that they receive specific per-
hope 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.
Note: It is strongly recommended for better network performance that the settings are
left as per their defaults.

Figure 36 TOS/DIFFSERV

Table 22 TOS/DIFFSERV

LABEL
ToS/DiffServ (00~FF)
APPLY
CANCEL
102
DESCRIPTION
Type the HEX code that represents the best method for data
transmission.
Click APPLY to save your changes without restarting the Prestige. Your
wireless LAN, Internet and SIP settings changes do not take affect until
you use RESTART (in the navigation panel).
Click CANCEL to begin configuring this screen afresh.
Chapter 13 Administrator Web Configurator Screens