ZyXEL P-663H-51 Guia Do Utilizador

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Chapter 9 Quality of Service (QoS)
P-663H-51 User’s Guide
90
IEEE 802.1p specifies the user priority field and defines up to eight separate traffic types. The 
following table describes the traffic types defined in the IEEE 802.1d standard (which 
incorporates the 802.1p).  
9.1.2  IP Precedence
Similar to IEEE 802.1p prioritization at layer-2, you can use IP precedence to prioritize 
packets in a layer-3 network. IP precedence uses three bits of the eight-bit ToS (Type of 
Service) field in the IP header. There are eight classes of services (ranging from zero to seven) 
in IP precedence. Zero is the lowest priority level and seven is the highest. 
9.1.3  DiffServ 
QoS is used to prioritize source-to-destination traffic flows. All packets in the flow are given 
the same priority. You can use CoS (class of service) to give different priorities to different 
packet types.
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. 
9.1.3.1  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. 
Table 33   IEEE 802.1p Priority Level and Traffic Type
PRIORITY  
LEVEL
TRAFFIC TYPE
Level 7
Typically used for network control traffic such as router configuration messages.
Level 6
Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations in 
delay).
Level 5
Typically used for video that consumes high bandwidth and is sensitive to jitter.
Level 4
Typically used for controlled load, latency-sensitive traffic such as SNA (Systems 
Network Architecture) transactions.
Level 3
Typically used for “excellent effort” or better than best effort and would include important 
business traffic that can tolerate some delay.
Level 2
This is for “spare bandwidth”. 
Level 1
This is typically used for non-critical “background” traffic such as bulk transfers that are 
allowed but that should not affect other applications and users. 
Level 0
Typically used for best-effort traffic.