ZyXEL Communications Version 1.03 - Manual (Page 146)

Chapter 14 Switch Configuration
NetAtlas Workgroup User’s Guide
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Figure 101 Switch Configuration: Priority Queue
The following table describes the labels in this screen.
Table 65 Switch Configuration: Priority Queue
LABELS DESCRIPTION
Priority Queue
Assignment
IEEE 802.1p defines up to 8 separate traffic types by inserting a tag into a MAC-layer
frame that contains bits to define class of service. Frames without an explicit priority
tag are given the default priority of the ingress port. Use these fields to configure the
priority level-to-physical queue mapping. On the switch, traffic assigned to higher
index queues gets through faster while traffic in lower index queues is dropped if the
network is congested.
Priority Level The following descriptions are based on the traffic types defined in the IEEE 802.1D
standard (which incorporates 802.1p). Select a level from the drop-down list box(es).
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.
Apply Click Apply to save your changes back to the switch.