ZyXEL Communications 2 10.6 QoS Technical Reference

Chapter 10 Quality of Service (QoS)

The following table describes the labels in this screen.

Table 48 Network Setting > QoS > Game List

LABEL	DESCRIPTION
Enable Game List	Select this to have QoS give the highest priority to traffic for the games you specify. This
	priority is higher than the other QoS queues.
	Select the games below.
Apply	Click this to save your changes.
Cancel	Click this to restore previously saved settings.

10.6 QoS Technical Reference

This section provides some technical background information about the topics covered in this chapter.

10.6.1 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).

Table 49 IEEE 802.1p Priority Level and Traffic Type

PRIORITY	TRAFFIC TYPE
LEVEL
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.

10.6.2 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.

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AMG1312-T Series User’s Guide