Chapter 10 Quality of Service (QoS)
P-661HNU-Fx User’s Guide
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The following table describes the labels in this screen.
10.6 QoS Technical Reference
This section provides some technical background information about the topics
covered in this chapter.
10.6.1 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.
10.6.2 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.
Table 42 Network Setting > QoS > Monitor
LABEL DESCRIPTION
Monitor
Refresh Interval Select how often you want the ZyXEL Device to update this screen.
Select No Refresh to stop refreshing statistics.
Status
# This is the index number of the entry.
Name This shows the name of the WAN interface on the ZyXEL Device.
Pass Rate (bps) This shows how many packets forwarded to this interface are
transmitted successfully.
Queue Monitor
# This is the index number of the entry.
Name This shows the name of the queue.
Interface The type of connection that the traffic is going through
Pass Rate (bps) This shows how many packets assigned to this queue are transmitted
successfully.
Drop Rate (bps) This shows how many packets assigned to this queue are dropped.
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