Qos Technical Reference; Ieee 802.1P; Ip Precedence - ZyXEL Communications P-660H-61 User Manual

Table 77 Advanced Setup > QoS > Class Setup (continued)
LABEL
802.1p Remarking Select a priority level (0 to 7) to re-assign the priority level to matched traffic.
Queue #
Add
Delete
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16.5 QoS Technical Reference

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

16.5.1 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 78 IEEE 802.1p Priority Level and Traffic Type
PRIORITY
LEVEL
Level 7
Level 6
Level 5
Level 4
Level 3
Level 2
Level 1
Level 0

16.5.2 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.
ADSL Router Series User's Guide
DESCRIPTION
Specify a queue tag to matched traffic. Traffic assigned to a higher queue gets through
faster while traffic in lower queues is dropped when there is network congestion.
Click this to add the rule.
Click this to remove the rule.
Click this to restore previously saved settings.
TRAFFIC TYPE
Typically used for network control traffic such as router configuration messages.
Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations in
delay).
Typically used for video that consumes high bandwidth and is sensitive to jitter.
Typically used for controlled load, latency-sensitive traffic such as SNA (Systems Network
Architecture) transactions.
Typically used for "excellent effort" or better than best effort and would include important
business traffic that can tolerate some delay.
This is for "spare bandwidth".
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.
Typically used for best-effort traffic.
Chapter 16 Quality of Service (QoS)
215