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ZyXEL Communications Corporation AMG1302 Manuel D’Utilisation

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Chapter 15 Quality of Service (QoS)
AMG1302-T10A User’s Guide
174
15.3  QoS Technical Reference
This section provides some technical background information about the topics covered in this 
chapter.
15.3.1  IEEE 802.1p
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). 
15.3.2  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.
IPP/TOS (DSCP)
This shows the IPP/TOS or DSCP settings.
802.1p
This is the 802.1p priority level.
Actions
IPP/TOS (DSCP) 
Remarking
The Device re-assigns the priority values specified in this field to matched traffic.
802.1p Remarking
The Device re-assigns the priority levels specified in this field to matched traffic.
Queue #
The Device assigns the queue level specified in this field to matched traffic.
Table 65   
Advanced Setup > QoS > Rule&Action Summary
LABEL
DESCRIPTION
Table 66   
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.