ZyXEL Communications EMG5324-D10A User Manual
Chapter 9 Quality of Service (QoS)
EMG5324-D10A User’s Guide
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The following table describes the labels in this screen.
9.6 QoS Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
chapter.
9.6.1 IEEE 802.1Q Tag
The IEEE 802.1Q standard defines an explicit VLAN tag in the MAC header to identify the VLAN
membership of a frame across bridges. A VLAN tag includes the 12-bit VLAN ID and 3-bit user
priority. The VLAN ID associates a frame with a specific VLAN and provides the information that
devices need to process the frame across the network.
membership of a frame across bridges. A VLAN tag includes the 12-bit VLAN ID and 3-bit user
priority. The VLAN ID associates a frame with a specific VLAN and provides the information that
devices need to process the frame across the network.
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).
following table describes the traffic types defined in the IEEE 802.1d standard (which incorporates
the 802.1p).
Table 38
Network Setting > QoS > Monitor
LABEL
DESCRIPTION
Monitor
Refresh
Interval
Interval
Select how often you want the Device to update this screen. Select No Refresh to stop
refreshing statistics.
refreshing statistics.
Status
#
This is the index number of the entry.
Name
This shows the name of the WAN interface on the Device.
Pass Rate (bps) This shows how much traffic (bps) 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.
Pass Rate (bps) This shows how much traffic (bps) assigned to this queue are transmitted successfully.
Drop Rate (bps) This shows how much traffic (bps) assigned to this queue are dropped.
Table 39
IEEE 802.1p Priority Level and Traffic Type
PRIORITY
LEVEL
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).
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.
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.
business traffic that can tolerate some delay.
Level 2
This is for “spare bandwidth”.